Toner Cartridge

Image forming equipment using a toner cartridge

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Toner Cartridge Abstract
Image forming equipment of the type supplying a toner to a developing device thereof by using a cartridge which is filled with a toner. The cartridge has a sealed opening and is brought to a toner supply position in the equipment without having the opening unsealed by the operator. Even when the cartridge is pulled out during the loading operation, the toner is not scattered about. A new cartridge for replacing a used empty cartridge is brought to the toner supply position without requiring the operator to remove the empty toner. During the replacement, the toner remaining on the walls of the empty cartridge is prevented from being sprinkled.

Toner Cartridge Claims
What is claimed is:

1. Image forming equipment of the type supplying a toner to a developing device thereof by using a cartridge which contains said toner therein and has an openable wall portion, said equipment comprising:

a cartridge inserting section for inserting said cartridge into said equipment;

a toner supplying section independent of said cartridge inserting section and having a toner supply position where said cartridge supplies the toner;

opening means for opening said openable wall portion;

cartridge transporting means for transporting said cartridge having been inserted via said cartridge inserting section to said toner supply position, said opening means opening said openable wall portion of said cartridge at said toner supply position, whereby the toner is supplied to said toner supplying section; and

sensing means for determining whether or not said cartridge has been brought to a predetermined position by said cartridge transporting means; and

alerting means responsive to an output of said sensing means for showing an occurrence that said cartridge has failed to reach said predetermined position despite that said cartridge transporting means has operated a predetermined period of time.

2. Equipment as claimed in claim 1 further comprising control means responsive to an output of said sensing means for causing said cartridge transporting means to repeat an operative and an inoperative state alternately a predetermined number of times when said cartridge has failed to reach said predetermined position despite that said cartridge transporting means has operated a predetermined period of time.

3. Equipment as claimed in claim 1, further comprising control means responsive to an output of said sensing means for inhibiting said cartridge transporting means from operating when said cartridge has failed to reach said predetermined position despite said cartridge transporting means has operated a predetermined period of time.

4. Equipment as claimed in claim 1, further comprising agitating means for agitating the toner in said developing device in response to the supply of the toner to said toner supplying section, and control means for controlling the duration of agitation by said agitating means.

5. Equipment as claimed in claim 4, further comprising duration determining means for determining said duration of agitation on the basis of the concentration of the toner in said developing device.

6. Equipment as claimed in claim 1, further comprising toner sensing means for sensing the amount of the toner remaining in said developing device.

7. Image forming equipment of the type supplying a toner to the developing device thereof by using a cartridge which contains said toner therein and has an openable wall portion, said equipment comprising:

a cartridge inserting section for inserting said cartridge into said equipment;

a toner supply section independent of said cartridge inserting section and having a toner supply position where said cartridge supplies the toner;

opening means for opening said openable wall portion;

cartridge transporting means for mechanically and automatically transporting said cartridge having been inserted via said cartridge inserting section to said toner supply position, said opening means opening said openable wall portion of said cartridge at said toner supply position, whereby the toner is supplied to said toner supply section;

an openable door provided in an inlet to said cartridge inserting section; and

control means for inhibiting said equipment from operating when said door is not closed within a predetermined period of time after said cartridge has been inserted into said cartridge inserting section.

8. Equipment as claimed in claim 7, further comprising alerting means for showing an occurrence that said door is not closed within a predetermined period of time after said cartridge has been inserted into said cartridge inserting section.

9. Image forming equipment of the type supplying a toner to a developing device thereof by using a cartridge which contains said toner therein and has an opening for releasing said toner and a seal member for sealing said opening, said equipment comprising:

a cartridge inserting section for inserting said cartridge;

a toner supplying section independent of said cartridge inserting section and having a toner supply section where said cartridge supplies the toner;

unsealing means for removing said seal member from said cartridge;

accommodating means for accommodating said seal member removed from said cartridge by said unsealing means;

cartridge transporting means for transporting said cartridge having been inserted into said cartridge inserting section to said toner supply position;

sensing means for monitoring a condition in which said unsealing means removes said seal member from said cartridge; and

alerting means responsive to an output of said sensing means for showing an occurrence that a predetermined removal condition is not set up despite that said unsealing means has operated a predetermined period of time.

10. Equipment as claimed in claim 9, further comprising accommodating means for accommodating said seal member removed from said cartridge by said unsealing means.

11. Equipment as claimed in claim 9, further comprising cartridge transporting means for transporting said cartridge having been inserted into said cartridge inserting section to said toner supply position.

12. Equipment as claimed in claim 11, further comprising sensing means for monitoring a condition in which said unsealing means removes said seal member from said cartridge.

13. Equipment as claimed in claim 12, further comprising alerting means responsive to an output of said sensing means for showing an occurrence that a predetermined removal condition in not set up despite that said unsealing means has operated a predetermined period of time.

14. Equipment as claimed in claim 9, further comprising control means responsive to an output of said sensing means for causing said unsealing means to repeat an operative state and an inoperative state alternately a predetermined number of times when a predetermined removal condition is not set up despite that said unsealing means has operated a predetermined period of time.

15. Equipment as claimed in claim 9, further comprising control means responsive to an output of said sensing means for inhibiting the operation of said unsealing means when a predetermined removal condition is not set up despite that said unsealing means has operated a predetermined period of time.

16. Equipment as claimed in claim 9, further comprising a collecting section inependent of said toner supply position for collecting said cartridge having supplied the toner to said toner supplying section.

17. Equipment as claimed in claim 9, further comprising empty cartridge transporting means for transporting said cartridge having supplied the toner from said toner supply position to said collecting section.

18. Equipment as claimed in claim 17, said collecting section being disposed on a path defined by said cartridge transporting means, said cartridge transporting means and said empty cartridge transporting means sharing part of members.

19. Equipment as claimed in claim 17, wherein said toner supply position is located on a path defined by said empty cartridge transporting means, said cartridge transporting means and said empty cartridge transporting means sharing part of members.

20. Equipment as claimed in claim 17 further comprising an openable door poositioned at an inlet to said cartridge inserting section.

21. Equipment as claimed in claim 20, further comprising door control means for holding said door in a closed position.

22. Equipment as claimed in claim 17, wherein said collecting section comprises collecting means capable of accommoadting a plurality of empty cartridges.

23. Equipment as claimed in claim 17, further comprising sensing means for determining whether or not said cartridge having been emptied has brought to a predetermined position by said empty toner transporting means.

24. Equipment as claimed in claim 23, further comprising alerting means responsive to an output of said sensing means for showing an occurrence that said cartridge having been emptied does not reach said predetermined position despite that said empty cartridge transporting means has operated a predetermined period of time.

25. Equipment as claimed in claim 23, further comprising control means responsive to an output of said sensing means for causing said empty cartridge transporting mean to repeat an operative state and an inoperative state alternately a predetermined number of times when said cartridge having been emptied does not reach said predetermined position despite that said empty cartridge transporting means has operated a predetermined period of time.

26. Equipment as claimed in claim 23, further comprising control means responsive to an output of said sensing means for inhibiting said empty cartridge transporting means from operating when said cartridge having been emptied does not reach said predetermined position despite that said empty cartridge transporting means has operated a predetermined period of time.

27. Equipment as claimed in claim 17, further comprising collection sensing means for monitoring a condition in which toner said cartridge having been emptied is collected in said collecting section.

28. Equipment as claimed in claim 27, further comprising alerting means responsive to an output of said collection sensing means for showing an occurrence that said cartridge having been emptied does not reach a predetermined collection condition despite that said empty cartridge transporting means has operated a predetermined period of time.

29. Equipment as claimed in claim 27, further comprising control means responsive to an output of said collection sensing means for causing said empty toner transporting means to repeat an operative state and an inoperative state alternately a predetermined number of times when said cartridge having been emptied does not reach a predetermined collection condition despite that said empty cartridge transporting means has operated a predetermined period of time.

30. Equipment as claimed in claim 27, further comprising control means responsive to an output of said collection sensing means for inhibiting said empty cartridge sensing means from operating when said cartridge haing been emptied does not reach a predetermined collection condition despite that said empty toner transporting means has operated a predetermined period of time.

31. Equipment as claimed in claim 17, further comprising an opening formed in said collecting section for receiving said cartridge having been emptied.

32. Equipment as claimed in claim 31, further comprising closing means for closing said opening.

33. Equipment as claimed in claim 17, further comprising air stream generating means disposed on a path defined by said empty cartridge transporting means for generating a stream of air in a direction different from an intended direction of transport of said cartridge having been emptied.

34. Image forming equipment of the type supplying a toner to the developing device thereof by using a cartridge which contains said toner therein and has an openable wall portion, said equipment comprising:

a cartridge inserting section for inserting said cartridge into said equipment;

a toner supply section independent of said cartridge inserting section and having a toner supply position where said cartridge supplies the toner;

opening means for opening said openable wall portion;

cartridge transporting means for transporting said cartridge having been inserted via said cartridge inserting section to said toner supply position, said opening means opening said openable wall portion of said cartridge at said toner supply position, whereby the toner is supplied to said toner supply section; and

air stream generating means for generating a stream of air on a path along which said transporting means transports said cartridge in a direction different from an intended direction of the cartridge transport.

35. Image forming equipment of the type supplying a toner to the developing device thereof by using a cartridge which contains said toner therein and has an openable wall portion, said equipment comprising:

a cartridge inserting section for inserting said cartridge into said equipment;

a toner supply section independent of said cartridge inserting section and having a toner supply position where said cartridge supplies the toner;

opening means for opening said openable wall portion;

cartridge transporting means for transporting said cartridge having been inserted via said cartridge inserting section to said toner supply position, said opening means opening said openable wall portion of said cartridge at said toner supply position, whereby the toner is supplied to said toner supply section; and

pressing means for pressing said cartridge located at said toner supply position such that said cartridge covers an opening formed in said toner supply section.

36. Equipment as claimed in claim 7, further comprising door control means for actuating said door to said closed position when a power source of said equipment if turned off.

Toner Cartridge Description
BACKGROUND OF THE INVENTION

The present invention relates to electrophotographic or electrostatic image forming equipment such as a copier, facsimile apparatus or printer and, more particularly, to image forming equipment of the type supplying a toner to a developing apparatus thereof by using a toner cartridge filled with a toner.

Image forming equipment of the type described has a developing device or unit which is loaded with a toner for developing a latent image electrostatically formed on an image carrier. A prerequisite with such equipment is that every time the toner is consumed to a predetermined degree, a supplementary amount of toner be fed to the developing unit. Conventional toner supply systems may generally be classified into two types, i.e., a system of the type directly supplying a to a toner hopper or similar supply section and a system of the type supplying a toner from a toner cartridge which is removably located at a toner supply position above the opening of a toner hopper. Today, the cartridge type system is predominant over the directly supply system because the latter is apt to cause the toner to scatter about to smear not only the equipment but also the operator's hands and cloths during the supply.

Even the cartridge type system has a problem left unsolved, as follows. When the amount of toner remaining in the developing unit decreases beyond a predetermined amount, the operator is expeted to unseal a new toner cartridge and substitute it for the toner cartridge existing in the equipment. When the operator strips a seal member from an opening which is formed in the new cartridge for supplying a toner, the toner deposited on the seal member is apt to sprinkle to smear the equipment and the operator's hands and cloths. To eliminate this problem, it has been proposed to dispose unsealing means in the toner supply position such that when a toner cartridge is inserted toward the toner supply position, the unsealing means contacts and cuts the seal member, as disclosed in, for example, Japanese Patent Laid-Open Publication No. 188182/1988 and Japanese Utility Mode Laid-Open Publication No. 122363/1988.

The above prior art unsealing scheme starts unsealing a cartridge as soon as the cartridge is inserted toward the toner supply position. This brings about a problem that when the operator interrupts the insertion of a cartridge noticing that the cartridge is not the one containing a desired color or having a proper size or that the orientation thereof is not correct, the seal of the cartridge has already been partly stripped. Should such a partly unsealed cartridge be pulled out from the equipment, the toner contained therein would be sprinkled to the inside and outside of the equipment. Moreover, the seal member cut by the unsealing section has the portions thereof adjoining the edges of the cartridge bent into the cartridge. The toner, therefore, remains between the bent portions of the seal member and the walls of the cartrige and is simply wasted.

Another problem with the conventional cartridge type system is that the operator has to replace the used toner cartridge with new one by removing the used cartridge by hand. Then, the toner adhered to the inner walls of the used cartridge is apt to contaminate the equipment and the hands and cloths by being sprinkled to the inside and outside of the equipment. In light of this, there has been proposed a toner supply system using a plurality of cartridges each having a particular size, as taught in, for example, Japanese Patent Laid-Open Publication No. 188171/1988. When one of the plurality of cartridges is to be located at the toner supply position of the developing unit, it is fitted in the preceding cartridge which is empty. In this manner, the cartridges sequentially brought to the toner supply position are each fitted in the preceding empty cartridge in a laminate core configuration. This allows the operator to supply a fresh toner to the developing unit without pulling out the empty cartridge.

However, the problem with the toner supply system using a plurality of cartridges as mentioned above is that when a new cartridge is forced into the empty cartridge remaining in the toner supply position, it generates a stream of air with the result that the toner remaining in the empty cartridge is scattered about to the inside and outside of the equipment. The empty cartridges in a laminate core configuration have to be removed from the equipment while sliding on members which define the toner supply position. Such an operation is troublesome. Moreover, it is likely that the toner adhered to the outermost empty cartridge is splinked. A mechanism for aligning an opening where a cartridge should be located and the opening of a toner hopper and a mechanism for preventing a toner from being sprinkled into the equipment via the hopper opening are densely arranged at the toner supply position. This forces the operator to take greatest care when inserting a cartridge to the toner supply position. Further, the operator has to locate a cartridge at the toner supply position accurately with the greatest care. In addition, the stack of empty cartridges have to be pulled out from the toner supply position via the limited space therearound.

SUMMARY OF THE INVENTION

It is, therefore an object of the present invention to provide image forming equipment which allows the operator to place a toner cartridge at a toner supply position of the equipment without requiring the operator to unseal it and prevents a toner contained in the cartridge from being sprinkled even when the operator pulls it out during the course of loading.

It is another object of the present invention to provide image forming equipment which allows the operator to place a toner cartridge at the toner supply position of the equipment without unsealing it and allows a minimum of toner to remain on the cartridge around the unsealed portion of the latter after the toner supply.

It is another object of the present invention to provide image forming equipment which allows the operator to supply a toner to the equipment without removing an empty toner from the toner supply position of the equipment and prevents the toner remaining on empty cartridges from being sprinkled.

It is another object of the present invention to provide image forming equipment which promotes the ease of insertion and removal of a toner cartridge from the toner supply position of the equipment.

In accordance with the present invention, image forming equipment of the type supplying a toner to a developing device thereof by using a cartridge which contains the toner therein and has an openable wall portion comprises a cartridge inserting section for inserting the cartridge into the equipment, a toner supplying section independent of the cartridge inserting section and having a toner supply position where the cartridge supplies the toner, and opening means for opening the openable wall portion.

Also, in accordance with the present invention, image forming equipment of the type supplying a toner to a developing device thereof by using a cartridge which contains a toner therein and has an opening for releasing the toner and a seal member for sealing the opening comprises a cartridge inserting section for inserting the cartridge, a toner supplying section independent of the cartridge inserting section and having a toner supply section where the cartridge supplies the toner, and unsealing means for removing the seal member from the cartridge.

Further, in accordance with the present invention, a cartridge filled with a toner and removably mounted on image forming equipment for supplying the toner to the equipment comprises an opening for releasing the toner, a seal member for sealing the opening, and unsealing means for removing the seal member from the cartridge.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken with the accompanying drawings in which:

FIG. 1 is a front view of image forming equipment embodying the present invention and implemented as a digital copier;

FIGS. 2A and 2B are a block diagram schematically showing an electrical arrangement incorporated in the embodiment;

FIG. 3 is a block diagram schematically showing a specific construction of a write drive control circuit shown in FIG. 2;

FIG. 4 is a front view of a cartridge usable with the digital copier;

FIG. 5 is a side elevation of the cartridge as viewed from the left;

FIG. 6 is a bottom view of the cartridge;

FIG. 7 is a perspective view of the cartridge as viewed from above;

FIG. 8 is a perspective view of the cartridge as viewed from below;

FIG. 9 is a perspective view showing the cartridge whose opening is closed by a seal member;

FIG. 10 is a perspective view of a toner supply mechanism included in the embodiment;

FIG. 11 is a front view showing the housing of the digital copier;

FIG. 12 is a front view showing an arrangement around a hopper opening included in the toner supply mechanism;

FIG. 13 is a view of the same arrangement as seen from the left;

FIG. 14 is a front view showing part of the tone supply mechanism surrounding unseal rollers;

FIG. 15 is a plan view showing a positional relation between the unseal rollers and the cartridge;

FIG. 16 is a perspective view showing transport belts included in the toner supply mechanism;

FIG. 17 is a perspective view showing a specific structure of a sensor included in the toner supply mechanism;

FIG. 18 is a side elevation as viewed from the left, showing the toner supply mechanism before the insertion of the cartridge;

FIG. 19 is a view similar to FIG. 18, showing the mechanism with the cartridge;

FIG. 20 is a side elevation as viewed from the left, showing the toner supply mechanism in a condition wherein it has completed the transport of the cartridge to a position above a hopper opening;

FIG. 21 is a side elevation, as viewed from the left, showing the toner supply mechanism in a condition wherein it has completed the reverse transfer of the cartridge;

FIG. 22 is a side elevation as viewed from the left, showing how an empty cartridge is collected in a collecting box;

FIG. 23 is a timing chart demonstrating the operation of the toner supply mechanism for loading a cartridge;

FIG. 24 is a timing chart representative of the reverse transport effected by the toner supply mechanism;

FIG. 25 is a perspective view of the collecting box;

FIG. 26 is a view showing the operation of an arrangement which moves a lid member provided on a corrugated cardboard box accommodated in the collecting box;

FIG. 27 is a view showing the operation of an arrangement for locking the collecting box in the equipment;

FIG. 28 is a plan view of the collecting box;

FIG. 29 is a front view of the collecting box;

FIG. 30 is a side elevation of the collecting box as viewed from the right;

FIG. 31 is a perspective view showing the collecting box being pulled out from the equipment body;

FIG. 32 is an enlarged perspective view of the end of the lid member provided on the cardboard box;

FIG. 33 is a view showing an arrangement for closing the lid of the cardboard box;

FIG. 34 is a view showing the lid moving arrangement in a condition near the end of operation;

FIG. 35 is a perspective view of the collecting box which is about to be inserted into the equipment body;

FIG. 36 is a fragmentary perspective view of an arrangement for supporting an arm provided on the collecting box;

FIG. 37 is a fragmentary side elevation of the arrangement of FIG. 36 as viewed from the left;

FIG. 38 is a plan view of the support arrangement;

FIG. 39 is a rear end view of the support arrangement;

FIG. 40 is a section of the cardboard box;

FIGS. 41A, 41B, 42A, 42B, 43A, 43B, 44A, 44B, 45A, 45B, 46A, 46B, 47A, 47B, 48A, 48B, 49, 50, 51A, 51B, 52, 53A, 53B, and 54 are flowcharts each showing a particular control procedure to be executed by the embodiment;

FIG. 55 shows a relation between the toner concentration an the amount of toner supply particular to the embodiment;

FIG. 56 is a perspective view showing a modified form of the toner supply mechanism;

FIG. 57 is a side elevation as viewed from the left, showing a cartridge forming part of the modified toner supply mechanism;

FIG. 58 is a bottom view of the cartridge shown in FIG. 57;

FIG. 59 is an enlarged view of a joint included in the modified toner supply mechanism;

FIG. 60 is a view showing a relation between the joint and a rotary disk mounted on the cartridge;

FIG. 61 is a front view of the modified toner supply mechanism;

FIG. 62 is a front view as seen from the left, showing a mechanism for unsealing the cartridge; and

FIG. 63 is a front view of the unsealing mechanism as seen from the right.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 of the drawings, image forming equipment embodying the present invention is shown and implemented as a digital copier by way of example. As shown, the digital copier is generally made up of a document reading device (scanner) 10, and a copying device (printer) 90 which executes a sequence of steps for reproducing document information read on a recording medium.

FIG. 2 shows an electrical arrangement of the digital copier. The reading device 10 has a housing accommodating a read control circuit 20, a read drive device 30, an image read circuit 40, and an image process circuit 50 are accommodated. The copying device 90 has a housing accommodating an image data store section 60, a copy circuit 70, a system controller 61, and an operating device 80 having keys and connected to the system controller 61. The data store section 60 has an image memory 62 and the system controller 61. The read control circuit 20, a write drive control circuit 71 built in the copy circuit 70, and the operating devie 80 are connected to the system controller 61 by signal lines L1, L2 and L3, respectively, and interchange data with each other.

The system controller 61 sends signals to the read control circuit 20 over the line L1 to cause it to control various components of the reading device 10, e.g., a scanner motor 1, lamp 32, a filter solenoid, and a fan. The image read circuit 40 has a CCD (Charge Coupled Device) image sensor 41 for converting an imagewise reflection from a document to an 80 dpi (dots per inch) analog signal. An amplifier 42 amplifies the output signal of the CCD image sensor 41 while dividing it into odd part and even part. This is because the time per pixel is too short for the amplifier 41 to handle the signal without dividing it. A switching device 43 combines the odd and even signals from the amplifier 42 to produce a serial analog signal. A variable amplifier 44 amplifies the analog signal from the switching device 43 by amplification degree command data AG which corrects a change in the illuminance of the lamp 32. An analog-to-digital converter (ADC) 45 transforms the resulting analog output of the variable amplifier 44 to a digital signal. The image process circuit 50 has five gate arrays 51-56, a clock generator 56, a ROM 57 and a RAM 58 for processing an image signal fed from the image read circuit 40. The gate array 51 senses the quantity of light, corrects shading, controls timings, controls commands, edits and outputs data, and generates a CCD drive clock. The gate array 52 changes the magnification in the main scanning direction. The gate array 53 processes halftone, binarizes image data, and detects a document size. The gate array 54 separates characters and halftone from each other and masks images. Further, the gate array 55 detects a marked area. The image memory 62 has a memory board and a memory control board. The system controller 61 controls the entire system and delivers commands for the write-in and read-out of image data. The control over the system includes monitoring the ready state of the system, sensing the size and the remaining amount of paper sheets, delivering a document read command and a paper feed start command, and controlling a scanner copy mode and a printer copy mode. When image data should be written in or read out, the system controller 61 determines the remaining capacity of the memory. The copy circuit 70 has a line driver 72 to which image data from the video memory 62 is applied, a laser driver 73 for amplifying an image data signal from a line driver 72, a semiconductor laser (LD) 74 driven by the laser driver 73, a read drive control circuit 75, a write drive control circuit 71, and a drive unit 76. The operating device 80 has an operation panel 81 having indicators and keys arranged thereon, and an operation control circuit 82.

Referring again to FIG. 1, the reading device 10 has a glass platen 306 to be loaded with a document. A scale 305 is positioned on the glass platen 306 adjacent to edge of the latter. A cover plate or platen cover 307 is capable of covering the entire area of the glass platen 306. A lamp 301 is disposed below the glass platen 306 for illuminating a document laid on the glass platen 306. An imagewise reflection from the document is sequentially reflected by a first to a third mirror 302, 303 and 304. The light from the third mirror 304 is routed through a lens 308 to a CCD image sensor 310 which is located at the focal point of the lens 308. The lens 308 is disposed in a cover 309. The CCD image sensor 310 is mounted on an image read board 311 which accommodates the ADC 45 therein. The image process circuit 50 is formed on a board 312. The reference numeral 313 designates a fan for cooling the image reading device 10.

As the operator sets a document on the glass platen 306 and then presses a copy start button provided on the operation panel 81, the optics including the lamp 301 is moved below and along the glass platen 306 to scan the document. The resulting reflection from the document is propagated through the mirrors and lens to reach the CCD image sensor 310. The CCD image sensor 310 reads the image represented by the incident light. Specifically, the image sensor 310 outputs an analog signal representative of the document image focused thereon in synchronism with a clock which is fed thereto from the image process circuit 50. The analog signal from the image sensor 310 is amplified, combined, variably amplified, and then applied to the ADC 45 to be converted to a digital signal. The image process circuit 50 converts the digital signal to digital image data and then delivers it to the image data storage 60.

As shown in FIG. 1, the copying device 90 has an image carrier in the form of a photoconductive belt 100 which is passed over an upper and a lower support roller 381 and 382. The support rollers 381 and 382 each extends perpendicular to the sheet surface of FIG. 1 and is deviated from the other in the vertical direction. A transfer charger 352 faces the belt 100 at a position where the belt 100 is passed over the support roller 381, constituting an image transfer station. A guide plate 383, a first transit roller pair 327 and an intermediate roller pair 349 define a transport path which extends from the above-mentioned image transfer station to a paper tray 348. The paper tray 348 is held in a horizontal position in an upper portion of the device 90 and loaded with paper sheets of particular size. A pick-up roller 324 and a reverse roller 326 are associated with the paper tray 348, serving as a sheet feeding device 390 in combination. A register roller pair 353 is located on the transport path adjacent to the image transfer station. A discharge roller pair 330 is disposed in an upper right portion of the device 90. A fixing device has a fixing roller 335 accommodating a heater 366 therein, and a pressing roller 334. A conductive separation and transport belt 351, the fixing device and a transport path defined by a roller pair 332 and a guide plate 384 are arranged between the image transfer station and the discharge roller pair 330. A separator in the form of a pawl 337 is located in close proximity to and downstream of the image transfer station with respect to an intended direction of movement of the surface of the belt 100. A cleaning fur brush 338 and a cleaning blade 339 are located downstream of the pawl 337. A waste toner bottle 340 is positioned at the right-hand side of the region where the surface of the belt 100 moves downward. A toner is removed from the surface of the belt 100 by the fur brush 338 and blade 339 and then collected in the waste toner bottle 340. A discharge lamp 342 and a main charger 342 which has a grid 343 are positioned below the waste toner bottle 340 and face the belt 100. The main charger 342 is connected to a high-tension power source of negative voltage so as to uniformly charge the surface of the belt 100 to -800 volts. An exposure station is defined in the portion where the belt 100 wraps around the lower support roller 382. An optical writing unit 385 is held in a horizontal position in a lower portion of the device 90 and emits a laser beam toward the above-mentioned exposure station. The writing unit 385 has the semiconductor laser 74, FIG. 2, a cylindrical lens, a polygonal mirror 344 driven by a motor 345 in a rotary motion, an f-theta lens 355, a mirror 356, and a synchronization detector 357. A developing device 386 is located above the writing unit 385 and has a casing 101 and a toner hopper 109. A developing roller 102 is accommodated in the casing 101 in such a manner as to face the region where the surface of the belt 100 moves upward. Also accommodated in the casing 101 are, as shown in FIG. 12, a doctor blade 105 for regulating the amount of developer deposited on the developing roller 102, a separator 106 for guiding the part of the developer removed by the doctor 105 and moving downward, a fin 107 and a conveyor screw 108 for agitating the developer in the casing 101 in the axial direction of the roller 102, a paddle 103 for agitating the developer in the casing 101 in a direction perpendicular to the axis of the roller 102, and a mixing roller 104 for mixing a fresh toner fed from a toner hopper 109 with the developer. The toner hopper 109 has an opening at the lower end thereof which is communicated to the casing 101. A toner supply roller 110 is disposed in the opening of the toner hopper 109. An agitator 111 is accommodated in the toner hopper 109 to agitate the toner thereinside. The toner hopper 109 has an opening at the upper end thereof also, forming a toner supply section. A toner cartridge 112 filled with a fresh toner is removably mounted on the toner supply section. A collecting box 133, FIGS. 10 and 13, is located at one side of the toner hopper 109 which is the viewer's side on FIG. 12. The collecting box 133 is ready to accomodate the toner cartridge 112 having released the toner contained therein, i.e., empty cartridge. Optional paper feed devices 391 and 392 are mounted on the top of copying device 90 and have respectively paper trays 346 and 347, pick-up rollers 314 and 319, feed rollers 315 and 320, and reverse rollers 316 and 321. A second and a third transit roller pair 322 and 317 are associated with the paper feed devices 392 and 391, respectively. Each of the paper trays 348, 347 and 346 can be pulled out, as desired. Set sensors and size sensors are associated with the paper trays 348, 347 and 346. When the set sensors sense paper sheets stacked on the associated paper trays 348, 347 and 346, a motor, not shown, is driven to raise the stacks of sheets until the the stacks abut against the associated pick-up rollers 324, 314 and 319. To monitor the paper transport condition on the transport paths, a third transit sensor 318, a second transit sensor 323, a first transit sensor 328, an intermediate sensor 350, a register sensor 354, fixation sensor 331 and a paper discharge sensor 329 are provided.

A fan 359 and a filter 358 are mounted on the inner lower portion of the left panel of the device 90, as viewed in FIG. 1. The fan 359 cools off the motor 345 which drives the polygonal mirror. The filter 358 collects toner particles entrained by a stream of air which is generated by the fan 359 in the vicinity of the collecting box, or empty cartridge accommodating section, 133.

FIG. 3 shows a specific construction of the write drive control circuit 71. As shown, the control circuit 71 has a CPU 703 which receives the outputs of the various sensors via input gate arrays 701 and 702. Sensor groups 390a, 391a and 392a are respectively arranged in the sheet feeding devices 390, 391 and 392 and connected to the gate array 701. The sensor groups 390a-392a each includes a paper size sensor, paper end sensor, tray set sensor, and connection sensor. Also connected to the gate array 701 are the first to third transit sensors 328, 323 and 318 and a door open sensor 704. A sensor group 705 is connected to the gate array 702 and includes the previously mentioned sensors 350, 331 and 329, sensors 119 and 130, which will be described, associated with a toner cartridge, a body door open sensor, and a toner concentrtion sensor 360 which is a photosensor. An output gate array 706 is connected to an actuator group 707 which includes a transit clutch for paper transport, an intermediate clutch, a register clutch, actutors 120, 122, 128 and 132 associated with a toner cartridge, a main motor, a cleaning blade solenoid, a toner supply solenoid, the polygonal mirror motor 345, the heater 336 for fixation, the high-tension power source for charging, a high-tension power source for image transfer, the discharge lamp 341, and the toner concentration sensor 360. Actuator groups 390b, 391b and 392b are respectively associated with the paper feed deviecs 390, 391 and 392 and connected to the output ports of the CPU 703 via serial parallel receivers 708-710. Each of the actuator groups 390b-392b includes a pack-up solenoid, a paper feed clutch, a tray lock solenoid, and an elevation motor.

In the above construction, the semiconductor laser 74 situated in the writing unit 385 is driven by the laser driver 73 in response to digital image data which is a one bit (record/non-record) per pixel bilevel signal. The beam issuing from the semiconductor laser 74 is reflected by the polygonal mirror 344 and then routed through the cylindrical lens, f-theta lens 355 and mirror 356 to reach the photoconductive belt 100. The polygonal mirror 344 is rotated at a constant speed by the motor 345 with the result that the laser beam is steered in the horizontal direction which is perpendicular to the moving direction of the belt 100.

The surface of the belt 100 is uniformly charged to -800 volts by the main charger 342 beforehand. As the laser beam representative of image data illuminates the charged surface of the belt 100, the charge deposited on the belt 100 is dissipated to ground via the conductive layer of the belt 100. The semiconductor laser 74 is turned on for areas where the document density is high (i.e. the bilevel signal has the record level) and is not turned on for areas where it is low (i.e. the bilevel signal has the non-record level). As a result, the areas of the surface of the belt 100 corresponding to low document densities have a potential of substantially -800 volts while the areas corresponding to high document densities have a potential of about -100 volts. In this manner, a latent image is electrostatically formed on the belt 100 in association with the density distribution of the document. The developing device 386 develops the latent image by a toner to form a toner image on the surface of the belt 100. The toner in the developing device 386 is negatively charged by agitation, and the developing roller 102 in the casing 101 is biased to about -550 volts by a bias generator. In this condition, the negatively charged toner deposits on the areas of the belt 100 where the surface potential is higher than the bias voltage, forming a toner image matching the document image.

A paper sheet is fed from selected one of the three paper trays 348, 347 and 346 to the register roller 353. The register roller 353 drives the paper sheet at a predetermined timing to the image transfer station. Then, the transfer charger 352 transfers the toner image from the belt 100 to the paper sheet. The paper sheet carrying the toner image thereon is separated from the belt 100 by the conductive separation and transport belt 351. Subsequently, the paper sheet has the toner image fixed thereon by the fixing roller 335 and pressing roller 334. Finally, the paper sheet with the fixed image, or copy, is driven out by the discharge roller pair 330 to a copy tray, not shown.

After the image transfer, the cleaning fur brush 338 and cleaning blade 339 remove the toner remaining on the belt 100 to prepare the belt 100 for another copying cycle.

How a fresh toner is supplied from the toner cartridge 112 to the hopper 109 will be described hereinafter. Briefly, the cartridge 112 filled with a toner is set on the top opening 124 of the hopper 109, and the toner is supplied from the cartridge 112 to the hopper 109 via the opening 124. To begin with, a reference will be made to FIGS. 4 and 9 for describing the toner cartridge 112 applicable to the embodiment specifically.

The toner cartridge 112 has a generally truncated quadrangular pyramid configuration having an oblong bottom and has an opening 113 at the bottom thereof. The interior of the cartridge 112 is to be filled with a toner. An air vent is formed through the top of the cartridge 112 and covered by a filter 153 which stops a toner. A magnet 152 is affixed to substantially the center of the inner surface of the top wall. A flange 115a extends out from the edges of the bottom opening 113. A right and a left wings 115b extend further outward from opposite longer portions of the flange 115a and positioned at substantialy the center of the latter. The right ring 115b is wider than the left wing 115b as measured in the direction of the shorter sides of the cartridge 112. Each wing 115b is inclined upward at opposite ends thereof with respect to the longer sides of the cartridge 112. After a toner has been filled in the cartridge 112, a seal member 114 is adhered to the flange 115a to cover the entire opening 113. An unsealing mechanism which will be described adjoins the left portion of the flange 115a when the cartridge 112 is located above the opening 124 of the tonner hopper. For this reason, the seal member 114 is adhered to the left portion of the flange 115a first, then adhered to the other portions up to the right portion 115a, and then folded back to extend out from the left wing 115b. The edge of the free end extending out from the left wing 115b, i.e., a tag is adhered to the wing 115b.

As shown in FIG. 10, the equipment body includes a cartridge inserting section implemented as an opening 117 which is formed through the front panel 116 of the equipment. The hopper 109 or toner supplying section is positioned at the rear side of the device. Unsealing means for opening the cartridge 112 is located at the left-hand side of the opening 124 of the hopper 109 and includes unseal rollers 150. A seal member collecting section is located face the unseal rollers 150 and implemented as a box 151. The empty cartridge accommodating section, i.e., collecting box 133 is interposed between the hopper 109 and the front panel 116. Transporting means is constituted by belts 121 and flat transit guides 123. As shown in FIG. 11, the front panel 116 is formed with, in addition to the opening 117, an opening 116a for the box 133. The opening 117 assigned to the cartridge 112 is slightly larger than the cartridge 112 with respect to a section of the cartridge 112 which is perpendicular to the direction of cartridge insertion. The opening 117 has horizontal extensions 117a and 117b which are dimensioned to accommodate the wings 115b of the cartridge 112 and, therefore, different in dimension from each other as measured in the right-and-left direction. Such a configuration prevents the cartridge 112 from being inserted into the opening 117 in a wrong position.

A door 118 is disposed inwardly of the front panel 116 and rotatably supported at the lower end thereof by a horizontal shaft which extends parallel to the panel 116. The door 118 covers the entire opening 117 when closed. The door 118 is constantly biased by means, not shown, in a direction for closing the opening 117 and usually held in a closed position. When the door 118 is pushed into the equipment against the action of the biasing means, it is tiltable by up to about 90 degrees about the horizontal shaft. A projection plate 118a is mounted on the inner surface of the door 118 that faces the interior of the device when the door 118 is closed. The projection plate 118a has a projection extending out beyond the edge of the door 118.

A locking mechanism is affixed to the inner surface of the front panel 116 above the opening 117. The locking mechanism is made up of a door sensor 119, an unlock solenoid 120, and a lock plate 120a affixed to the plunger of the solenoid 120. The door sensor 119 is positioned such that when the door 118 is closed, the projection of the projection plate 118a intervenes between the light emitting element and the light-sensitive element of the door sensor 119. The locking mechanism is positioned such that when the solenoid plunger is drawn out while the door 118 is closed, the lock plate 120a engages with the projection plate 118a from the opposite side to the front panel 116 and, when the solenoid plunger is pulled in, the lock plate 120a is released from the projection plate 118a.

A seal 125 is fitted on the upper surfaces of the edges of the hopper 109 which surround the opening 124, preventing a gap from being formed between the such edges and the lower surface of the flange 15a of the cartridge 112. An inlet guide 109a extends out from the hopper 109 toward the front panel 116 away from the hopper opening 124. An upright abutment or wall 126 extends from the rear end of the hopper 109 for positioning the cartridge 112 above the opening 124. As shown in FIG. 13, impacting means is disposed above the hopper opening 124 and made up of a roller 131 supported by a rotatable support plate 131a, a spring 131b constantly biasing the plate 131a in a direction for moving the roller 131 upward, and a solenoid 132 capable of moving the plate 131a and, therefore, the roller 131 downward against the action of the spring 131b.

As shown in FIGS. 14 and 15, the unseal rollers 150 included in the unsealing means is made up of a pair of upper rollers 150a and a pair of lower rollers 150b. The upper rollers 150a are affixed to an upper rotatable shaft and spaced apart from each other by a distance corresponding to the length of the left wing 115b of the cartridge 112. The lower rollers 150b are affixed to a lower rotatable shaft 150b and spaced apart from each other such that the they face the upper rollers 150a. To surely pull the seal member 114 fitted on the cartridge 112, the lower rollers 150b are implemented as cylindrical rollers made of an elastic material while the upper rollers 150a are provided with irregular surfaces. The upper and lower shafts are rotatably mounted on a link mechanism so that their distance are variable. An unseal motor 129, FIG. 15, drives the upper and lower shafts. As shown in FIG. 14, a spring and a pinch solenoid 128 are connected to the link mechanism. The spring connected to the link mechanism constantly biases the upper and lower shafts such that a gap capable of accommodating the wing 115b is defined between the upper and lower roller pairs. The pinch solenoid 128, when energized, reduces the gap between the upper and lower rollers against the action of the spring such that the upper and lower rollers nip the seal member 114 therebetween. The seal collecting box 151 has an opening to allow the seal member 114 being stripped from the cartridge 112 by the rollers 150 to enter the box 151.

The cartridge collecting box 113 is removably mounted on the equipment body and has an opening at the top thereof for receiving the cartridge 12. As shown in FIG. 11, a door 116b usually closes an opening 116a which is formed in the equipment body for pulling out the box 113. The cartridge collecting box 133 will be described in detail later.

As shown in FIGS. 14 and 16, the right and left transport belts 121 are driven by a motor 122, and each is passed over pulleys. The axes of the pulleys are positioned parallel to the right and left inclined walls of the cartridge 112, so that the belts 121 may contact the right and left inner surfaces of the cartridge 112. The output shaft 122a of the motor 122 is positioned parallel to the left inclined wall of the cartridge 112. A belt 170 is passed over a pulley mounted on the output shaft 122a of the motor 122 and a pulley mounted coaxially with the rear pulley over which the left belt 121 wraps. In this configuration, the rotation of the motor 122 is transmitted to the left belt 121 via the belt 170. A bevel gear 171 is mounted on the lower end of the motor output shaft 122a and held in mesh with a bevel gear 172 which is mounted coaxially with the rear pulley of the right belt 121. Hence, the rotation of the motor 122 is also transmitted to the right belt 121 via the gears 171 and 172. As shown in FIG. 16, when the output shaft of the motor 122 is rotated counterclockwise, the belts 121 transport the cartridge 12 toward the rear end of the equipment. Conversely, when the output shaft of the motor 122 is rotated clockwise, the belts 121 drive the cartridge 112 toward the front end of the equipment. The rotation of the motor 122 which causes the belts 121 to drive the cartridge 112 to the rear as viewed in FIG. 16 will hereinafter be referred to as forward rotation, and such a movement of the belts 121 will be referred to as forward transport. The rotation of the motor 122 in the other direction and the resulting movement of the belts 121 will be referred to as reverse rotation and reverse transport, respectively. Preferably, the front pulleys over which the belts 121 are passed are positioned such that the leading end of the cartridge 112 being inserted into the equipment through the opening 117 reaches the belts 121 while the trailing end of the cartridge 112 is still located at the outside, so that the operator does not have to put the hand into the equipment. In this embodiment, such pulleys are positioned above and at substantially the center of the opening of the collecting box 133 in the longitudinal direction of the opening. The material of the belts 121 and the contact pressure which the belts 121 exert on the inclined walls of the cartridge 121 are selected such that the emptied cartridge 121 would fall by gravity if it were not supported from below. The flat transit guides 123 are parallel to each other and extend in the direction in which the cartridge 112 is inserted into the equipment. The distance between the transit guides 123 is greater than the distance between the outermost edges of the right and left portions of the flange 115a, so that only the wings 115b may rest on the guides 123. The front end of each transit guide 123 is positioned above the opening of the box 133 while the rear end is located at one of opposite sides of an inlet guide 109a which extends out from the edge of the hopper opening 124. As shown in FIG. 21, the front end of each transit guide 123 assumes such a position that while the reverse transport of the cartridge 112 by the belts 121 is under way, the cartridge 112 is positioned at substantially the center of the box 133 in the longitudinal direction when the end of each wing 115b of the cartridge leaves the above-mentioned end of the transit guide 123. At the instant when the ends of the wings 115b of the cartridge 112 leave the front ends of the transit guides 123, the belts 121 are still capable of transporting the cartridge 112 in the reverse direction. However, because the door 118 has been retracted from the position above the opening of the box 113, the cartridge 112 is not sustained and, therefore, begins to fall into the box 133 by gravity.

A feeler 130a, FIG. 10, is located on the transport path between the box 133 and the hopper opening 124 in order to monitor the transport of the cartridge 112. When the cartridge 112 moves along the transport path, the left portion of the flange 115a presses the feeler 130a downward with the lower surface thereof. As shown in FIG. 17, the feeler 130a is affixed to the free end of an arm 130d which is rigidly mounted on a rotatable shaft 130c. The shaft 130c is constantly biased counterclockwise by a coil spring or similar biasing means, not shown. Also mounted on the rotatable shaft 130c is a feeler 130b. When the unseal rollers 150 strip the seal member 114 from the bottom of the cartridge 112, the seal member 114 in turn urges the tip of the feeler 130b to the left of the equipment. Such a counterclockwise force acting on the shaft 130c is selected such that when both the feelers 130a and 130b are in a free state, the force is balanced with the rotational moment ascribable to, among others, the weight of the arm 130d, positioning the lower end of the feeler 130b between the light emitting element and the light-sensitive element of the sensor 130.

The operation of the embodiment will be described with reference to FIGS. 18-22, 23 and 24. To begin with, a reference will be made to FIGS. 18-20 and 23 for describing the procedure from the insertion of the toner cartridge 112 to the supply of the toner which occurs at the position above the hopper opening 124.

The unlock solenoid 120 is usually deenergized by unlock solenoid control which will be described, locking the door 118 of the opening 117 in the closed position. When the cartridge 112 has to be inserted through the opening 117 such as in a toner near end condition, the unlock solenoid 120 is energized to unlock the door 118. Then, the cartridge 112 is inserted into the equipment while being positioned such that the seal member 114 faces downward and the right longer wing 115b is located at the right-hand side. At this instant, the leading end of the cartridge 112 forces the door 118 into the equipment. As shown in FIG. 19, the door 118 rotates about the horizontal shaft and stops rotating on tilting about 90 degrees. In this condition, the door 118 has covered part of the opening of the cartridge collecting box 133, preventing the cartridge 112 from falling into the box 133. At the same time, the door 118 cooperates with the transit guides 123 to form a transport path for transferring the cartridge 112 to the hopper opening 124. As soon as the door 118 begins to open, the tip of the projection plate 118 affixed to the inner surface of the door 118 moves out of the gap between the light emitting element and the light-sensitive element of the door sensor 119. As a result, the door sensor 119 is turned on to show that the door 118 has been opened.

When a predetermined period of time expires after the turn-on of the door sensor 119, the motor 122 for transporting the cartridge 112 starts on a forward rotation. The cartridge 112 is, therefore, pulled deeper into the equipment by the belts 121 without resorting to any further manual operation. The cartridge 112 is moved to the position above the hopper opening 124 while being guided by the door 118 and transit guides 123. When the leading end of the cartridge 112 (in the traveling direction of the cartridge 112) arrives at the feeler 130a, it turns on the sensor 130. As the trailing end of the cartridge 112 moves away from the sensor 130, the sensor 130 is turned off (FIG. 23, [II]). As the trailing end of the cartridge 112 moves away from the door 118, the door 118 rotates upward to close the opening 117 again, turning off the door sensor 119. At the time when the sensor 130 is turned off (FIG. 23, [II]), the cartridge 112 has reached a position above the hopper opening 124, i.e., a toner supply position and has the leading end thereof abutting against the wall 126. To position the cartridge 112 more positively, the motor 122 is rotated in the forward direction over an extra period of time (FIG. 23, T12). As a result, the cartridge 112 is located at the toner supply position, as shown in FIG. 20. At this instant, the transition from the cartridge transport procedure to a cartridge unsealing procedure occurs.

Specifically, at the time when the sensor 130 is turned off (FIG. 23, circled 2), it is determined that the door 118 has been closed as represented by the output of the door sensor 119. Then, the unlock solenoid 120 is turned off to lock the door 118 in the closed position. The pinch solenoid 128 is turned on to cause the unseal rollers 150 to nip the free left end of the seal member 114. At the same time, the motor 129 is energized to start rotating the rollers 150 with the result that the rollers 150 being to strip the seal member 114 from the bottom of the cartridge 112. Hence, the opening at the bottom of the cartridge 112 is sequentially uncovered. On reaching the feeler 130b, the leading edge of the seal member 114 turns on the sensor 130. After the seal member 114 has been fully removed from the cartridge 112, the trailing edge of the seal member 114 actuates the feeler 130b to turn off the sensor 130 (FIG. 23, circled 3). This state of the sensor 130 indicates that the bottom of the cartridge 112 has been fully uncovered. Then, the pinch solenoid 128 and motor 129 are deenergized. This is followed by a procedure for letting the toner surely fall from the cartridge 112, as follows.

After the sensor 130 has been turned off (FIG. 3, circled 3), the press solenoid 132 is repetitively turned on and off several times at predetermined intervals (five times in the embodiment). As a result, the roller 131 taps against the top of the cartridge 112 so as to cause the toner remaining in the cartridge 112 to fall into the hopper. Thereafter, the press solenoid 132 in continuously energized to urge the roller 131 against the top of the cartridge 112. Consequently, the lower surface of the flange 115a of the cartridge 112 is pressed against the upper surface of the seal 125, FIG. 10, surrounding the hopper opening 124. In this condition, the cartridge 112 plays the role of a lid for closing the hopper opening 124.

Further, when the sensor 130 is turned off (FIG. 23, circled 3), the main motor for driving the toner supply roller 110 and agitator 111 of the developing device 386 is turned on. On the elapse of a delay time (FIG. 23, T14) necessary fo the main motor to reach a steady state, a toner supply solenoid is turned on over a predetermined period of time (FIG. 3, T15) to transmit the rotation of the motor to the roller 110 and agitator 111. As a result, the toner in the hopper 109 is drien into the casing 101. The above-mentioned period of time T15 is determined on the basis of a toner concentration sensed by a toner sensor 360, as will be described later specifically.

Status flags each indicating a particular status included in the above sequence are set (ONE) or reset (ZERO) in a nonvolatile RAM. This allows the above sequence to be continued even when the power source is momentarily shut off while processing is under way.

Referring to FIGS. 21, 22 and 24, how the cartridge 112 disposed above the hopper opening 124 is collected in the empty cartridge collecting box 133 will be described. This operation begins in a toner near end condition and after the near end condition has been stored in the nonvolatile RAM. The retraction of the empty cartridge 112 from the hopper opening 124 itself needs only to be completed after, for example, a toner near end condition has occurred and before a new cartridge is inserted. Nevertheless, because the embodiment assigns the role of a lid to the empty cartridge 112 to prevent the toner from being scattered about, it begins to move the empty cartridge 112 toward the collecting box 133 away from the hopper opening 124 by awaiting a toner near end condition.

First, the press solenoid 132 is deenergized to release the roller 131 from the top of the cartridge 112 while the pinch solenoid 128 is deenergized to retract the unseal rollers 150. Then, the motor 122 is reversed to start on the reverse transport of the cartridge 112. After a predetermined period of time which is selected with consideration given to, among others, the sleep rate of the cartridge 112 and transport section has expired, the trailing edge of the cartridge 112 (opening 117 side) arrives at the feeler 130a to turn on the sensor 130. As soon as the cartridge 112 bodily moves away from the feeler 130a, the sensor 130 is turned off. At this time, the leading ends of the wings 115b of the cartridge 112 (hopper opening 124 side) have substantially left the transit guides 123 and are ready to fall. Nevertheless, the reverse rotation of the motor 122 is continued over an extra period o time (FIG. 4, T22) to allow the cartridge 112 to surely reach the position where it should begin to fall, as shown in FIG. 21. The period of time T22 is selected to be longer than the time in which the cartridge 112 falls by gravity and the interval between the time when the cartridge 112 moves away from the sensor 130 and the time when it reaches the drop position (consideration given to a sleep rate and other factors). After the above operation, a counter for counting the empty cartridges 112 in the box 133 and implemented by the nonvoltile RAM is incremented by one. At this time, the device is ready to receive a new cartridge 112. Hence, the unlock solenoid 120 is energized to unlock the door 118 while a near end condition is displayed.

As stated above, in the illustrative embodiment, the cartridge 112 inserted into the body of image forming equipment through the opening 117 by the operator is transported by the belts 121 in the forward direction to a position above the hopper opening 124. At this position, the seal member 114 is striped from the cartridge 112 to let the toner fall into the hopper 109. As soon as the toner is consumed to such an extent that the equipment needs a new cartridge, the empty cartridge 112 is transported in the reverse direction from the hopper opening 124 to the collecting box 133. When the box 133 is filled with such empty cartridges 112, the operator will pull out the box 133 from the equipment and discard the used cartridges 112.

Regarding the toner supply, therefore, the operator has only to inset a full cartridge into the equipment through the opening 117. When the collecting box 133 is filled with empty cartridges 112, all that is required is to pull out the box 133 and discard the cartridges 112. This not only promotes easy attachment and detachment of a cartridge 112 but also minimizes the chance of smears due to the toner.

For example, assume that the cartridge 112 accommodates 300 grams of toner while the collecting box 133 accommodates ten cartridges 112. Then, the eleventh cartridge 11 can be inserted into equipment before the empty cartridges 112 in the box 133 are discarded. It follows that the operator has only to insert cartridges 112 one by one until 3,300 grams of toner has been consumed. By contrast, assume that the mechanism of the embodiment is not used and entirely replaced with a toner hopper, and that a toner is supplied from a bottle or similar container. Then, the capacity of the hopper 109 is limited to one corresponding to substantially four cartridges 114 for layout reasons (see FIG. 12, for example), requiring the operator to supply a toner every time 1,200 grams of toner is consumed.

A reference will be made to FIGS. 25-40 for describing a specific construction of the box 133 for collecting empty cartridges 112. As shown, the box 133 has a removable corrugated cardboard box 410 for directly receiving the empty cartridges 112 thereinside. A know 421 is affixed to the front end of the collecting box 133 while a frame member or locking member 430 is affixed to the lower portion of the rear end of the box 133. As shown in FIG. 27, an unlock solenoid 431 is mounted on the equipment body in such a position that it is disposed below the frame member 430 when the box 133 is set in the equipment body. The unlock solenoid 431 has a plunger extending upward. A spring is associated with the unlock solenoid 431 to constantly bias the plunger toward the outside of the solenoid 431. When the solenoid 431 is deenergized, the plunger is pulled out by the spring to extend into the frame member 430 to thereby lock the box 133 in position. On the other hand, when the solenoid 431 is energized, it pulls the plunger out of the frame member 430 against the action of the spring, thereby unlocking the box 133. A set sensor 432 constituted by a light emitting element and a light-sensitive element is so positioned as to face the frame member 430 when the box 133 is mounted on the equipment body. The corrugated cardboard box 410 accommodated in the collecting box 133 has an opening 411 and a lid member 413 for closing it. The box 133 has a mechanism for moving the lid member 413 in interlocked relation to the movement of the box 133 out of the equipment body so as to close the opening 411. The mechanism is constituted by pawls 425 which are engageable with an upper bent member 414 affixed to the edge of the lid 413, a movable arm 424 to which the pawls 425 are affixed, and guide members 422 and 423 supporting the movable arm 424 movably on the box 133. The movable arm 424 has an upper horizontal portion 424a to which the pawls 425 are affixed and extending over a greater width than the body of the box 133, a right and a left arm portion 424b extending perpendicularly downward from both ends of the horizontal extension 424a, and a right and a left horizontal portion 424c extending from the lower ends of the opposite arm portions 424b toward each other, i.e., toward opposite sides of the box 133 and perpendicular to the arm portions 424b. The guide members 422 and 423 are implemented as a right and a left channel member affixed to opposite sides of the box 133. The channel members 422 and 423 each has a guide channel which received the end of one of the lower horizontal portions 424c of the arm 424 and allows it to slide therein. Specifically, the guide channels are each made up of an upper and a lower horizontal channel 450 and 451 having the same length, and a front and a read channel 453 and 454 connecting the horizontal channels 450 and 451 at the front and rear ends. The channel 450 is closer to the rear end of the box 133 than the channel 451, so that the channels 453 and 454 are inclined accordingly. The bottom of each upper horizontal channel 450 is configured to guide the arm 424 in a position relatively shifted to the left, as indicated by a solid line in FIG. 29. The bottom of each lower horizontal channel 451 is configured to guide the arm 424 in a position relatively shifted to the right, as indicated by a phantom line in FIG. 29. The front inclined channel 453 guides the arm 424 from the front end of the upper horizontal channel 450 to the front end of the lower horizontal channel 451. Specifically, the channel 453 has a first inclined portion 453a having a bottom which guides the arm 424 at the same position as the upper channel 450, a first shift portion 453b having a guide which guides the arm 424 while shifting it to the right, and a second vertical portion 453c having a guide which guides the arm 424 at the same position as the lower channel 451. A first eccentric member 426a is positioned at the corner where the lower end of the second vertical portion 453c merges into the lower channel 451. The eccentric member 426a is rotatable about an eccentric shaft to allow the arm 424 to move the vertical portion 453c to the lower channel 451 but to inhibit the arm 424 from moving from the channel 451 to the vertical portion 453c. The rear inclined channel 454 guides the arm 424 from the rear end of the lower channel 451 to the rear end of the upper channel 450. The channel 454, like the channel 453, has a third vertical portion having a bottom which guides the arm 424 at the same position as the upper channel 451, a second shift portion 454b having a bottom which guides the arm 424 while shifting it to the left, and a fourth vertical portion 455c whose bottom is configured to guide the arm 424 at the same position as the upper channel 450. A second eccentric member 426b is located at the corner where the upper end of the vertical portion 454c merges into the upper channel 450. The eccentric member 426b allows the arm 424 to move from the vertical portion 454c to the upper channel 450 but inhibits it from moving in the other direction. The upper channels 450 are located at such a level that while the arm 424 is guided thereby, the pawls 425 of the arm 424 do not contact the bent member 414 of the lid member 413. Conversely, the lower channels 451 are located at such a level that while the arm 424 is guided thereby, the pawl 425 are engageable with the bent member 414.

The lid member 413 for closing the opening 411 of the cardboard box 410 is implemented as a flexible sheet. The lid member 413 is affixed to the inner surface of the front end of the cardboard box 410 with respect to a condition wherein the box 410 is accommodated in the collecting box 133. For example, as shown in FIG. 40, the rear end of the lid member 413 is connected to the inner surface of the box 410 by adhesive and received in the box 410 in a folded position. In FIG. 40, the reference numerals 500 and 501 designate respectively an area where the lid member 413 is adhered and a guide rod for guiding the member 413 when the latter is pulled out. The previously mentioned upper bent portion 414 and a lower bent portion 415 are provided on the front end of the lid member 413. Notches 416 are formed in the upper bent member 414 in positions which the pawls 425 of the arm 424 face when the arm 424 is guided by the first shift portion 453b or the second shift potion 454b of the guide channel. The cardboard box 410 has an upwardly inclined portion 412 at the upper edge of the rear end thereof. When the lid member 413 closes the opening 411, the lower bent member 415 of the lid member 413 is caught by the inclined portion 412.

As shown in FIGS. 36-39, a support member is provided on the inner surface of the front panel 116 of the equipment body at both sides of an opening 166a through which the collecting box 133 may be pulled out. The support member supports the arm 424 such that the arm 424 is freely movable in a plane parallel to the panel 116 while remaining in an upright position. Specifically, a base 440 is mounted on the front panel 116 and perpendicular to the latter. A front support arm 443 is affixed to the base 440 at one end thereof and extends from the base 440 to the inside of the opening 116a in parallel to the panel 116. The support arm 443 has a vertical support surface. A rear support member 442 is rotatably mounte on the base 440 by a shaft 445 which is parallel to the panel 116. The rear support member 442 has an upper and a lower support rod 441 extending to the inside of the opening 116a in parallel to the front support arm 443. Biasing means, no shown, constantly biases the rear support member 442 such that the support member 442 tends to rotate upward. A stop 444 is provided on the base 440 and usually abuts against the rear support member 442 to prevent if from rotating. In this condition, the support rods 441 are aligned in the vertical direction. The portion of the vertical support member of the arm 443 and the portions of the support rods 441 each extending to the inside of the opening 116a correspond in length, as measured in the horizontal direction, to the displacement of the arm 424 caused by the guide members in the right-and-left direction. The arm portion 424b of the arm 424 is interposed between the aligned support rods 441 and the vertical surface of the support arm 443.

The collecting box 133 having the above configuration assumes the position shown in FIGS. 28-30, 38 and 39 when pulled out from the equipment body to the extreme position. As shown, the ends of the lower horizontal portions 422c of the arm 424 are located at the rear ends of the upper channels 450 of the guide members and inhibited from entering the rear inclined channels 454 by the second eccentric members 426b. The arm portions 424b are supported by the support members incorporated in the equipment body. Hence, the arm 424 assumes the high level in the up-and-down direction and the leftmost position in the right-and-left direction, as viewed from the front. In this condition, the corrugated cardboard box 410 can be put in or taken out of the collecting box 133.

After setting a new cardboard box 410 in the collecting box 133, the operator begins to insert the box 133 into the equipment body. Then, the arm portions 424b of the arm 424 are supported by the support members mounted on the equipment body in the predetermined position. The arm 424 is moved relative to the box 133 while being guided by the upper channels 450 of the guide members, until the lower horizontal portions 424c reach the front ends of the associated channels 450, as shown in FIG. 35. As the box 133 is inserted deeper into the equipment body, the lower horizontal portions 422 are guided by the front inclined channels 453 of the guide members with the result that the arm 424 is bodily lowered. At the same time, the arm 424 is bodily shifted to the right by the first shift portions 453b of the channels 453, as shown in FIG. 25. As shown in FIG. 25, the pawls 425 of the arm 424 pass the notches 416 of the upper bent member 414 of the lid member 413 while the arm 424 is bodily lowered. Further, the pawls 425 come to engage with the upper bent member 414 while the arm 424 is bodily shifted to the right. When the pawls 425 pass the corners where the front channels 453 and lower channels 451 join, they rotate the associated first eccentric members 426a. Thereafter, the eccentric members 426a are restored to prevent the pawls 425 from returning to the front channels 453. When the collecting box 133 is fully inserted into the equipment body, the set sensor 432 senses the frame member 430 provided on the rear end of the box 133. Then, the unlock solenoid 431 is turned off and has its plunger pulled out by the spring. As a result, the plunger protrudes into the frame member 430 to lock the box 133 in position. Under this condition, the previously stated copying operation is performed.

Assume that the cardboard box 410 has been filled with a predetermined number of empty cartridges 112 and needs to be replaced with a new cardboard box 410. Then, the unlock solenoid 431 is turned on by a procedure which will be described. As the plunger of the solenoid 431 is retracted from the frame member 430, the collecting box 133 can be pulled out of the equipment body. As the operator begins to pull out the collecting box 133, the arm 424 is supported by the support members and assumes a predetermined position. Hence, as shown in FIG. 31, the arm 424 is moved relative to the box 133 while being guided by the lower channels 451 of the guide members. As a result, the lid member 413 having the upper bent member 414 thereof engaged with the arms 425 is sequentially pulled out of the cardboard box 410 to thereby cover the opening 411 of the box 410. After the lower horizontal portions 424c of the arm 424 have reached the rear ends of the lower channels 451 of the guide members, they are guided by the rear inclined channels 454 with the result that the arm 424 is bodily raised. While the lower portions 424c of the arm 424 are guided by the second shift portions 454b of the channels 454, the whole arm 424 is shifted to the left. As shown in FIG. 34, while the whole arm 424 is shifted to the left, the pawls 425 are moved to the notches 416 of the upper bent member 414 of the lid member 414. Then, as the arm 424 is bodily raised, the pawls 425 leave the notches 416 upward. As shown in FIG. 33, the lower bent member 415 of the lid member 413 is caught by the upward inclined portion 412 of the box 410. As the box 133 is further pulled out, the arm 424 reaches the upper channels 450 while rotating the second eccentric members 426b.

As the operator pulls the collecting box 133 further outward from the outermost position, the rear support members 442 of the support members are rotated, as shown in FIG. 37. As a result, the box 133 can be bodily removed from the equipment body because the arm portions 424b of the arm 424 slip out of the front support arms 443 and upper and lower support rode 441 while tilting from the upright position.

Assume that after the cartridge 112 has been inserted into the equipment body and started to be driven toward the toner supply position, the leading end of the cartridge 112 fails to reach the feeler 130a within a predetermined period of time. Then, a cartridge jam detection procedure is executed, as will be described with reference to FIG. 41. This procedure occurs in the former half of the interval between the times indicated by encircled 1 and 2 in FIG. 23.

So long as the cartridge 112 is not inserted into the equipment body, the door open sensor 119 does not produce a buildup signal or turn on. In this condition, the program executes the iterative loop of steps 1-5, i.e., resets a jam flag, turns off a jam indicator, and resets a retry counter. On the insertion of the cartridge 112, the door open sensor 119 is turned on. In response, the program starts a jam timer (step 6) and sets an insert flag (7). As the door open sensor 119 turns on, whether or not the sensor 130 has turned on is determined (8). At this stage of operation, a predetermined period of time is necessary for the sensor 130 to turn on by having the feeler 130a thereof actuated by the leading end of the cartridge 112 after the insertion of the cartridge 112. Hence, the program advances to a step 9 to see if the jam timer started at the turn-on of the door open sensor 119 has exceeded a set value T6. If the answer of the step 9 is negative, the program returns to the step 1. This is repeated until the sensor 130 turns on as determined in the step 8 or until the jam timer has exceeded the time T6 as determined in the step 9. The time T6 is the sum of the interval between the turn-on of the door open sensor 119 and the arrival of the leading end of the cartridge 112 at the feeler 130a and a scattering .alpha.. Whether or not the cartridge 112 has jammed the path is determined on the basis of the relation of the count of the jam timer and the set value T6.

When the cartridge 112 is transported in a normal condition, the leading end thereof reaches the feeler 130 of the sensor 130 before the time T6 expires. On the turn-on of the sensor 130, the program resets the retry counter (5) and then returns to the step S1. On the other hand, when the cartridge 112 is not transported in a normal way due to a tilt or similar cause, the jam timer exceeds the set value T6. Then, the step 9 is followed by a step 10 for executing jam processing. Briefly, in the jam processing, the program tries to restore the cartridge 112 to a correct position on the transport path by repeating the steps of stopping the forward rotation of the motor 122, reversing it, and again causing it rotate in the forward direction up to, for example, three times, while determining whether or not the sensor 130 turns on. If the sensor 130 does not turn on even after such steps have been repeated three times, the program turns on the jam indicator and deenergizes the motor 122.

Specifically, whether or not the retry counter has exceeded 3 is determined (10). If the answer of the step 10 is negative, the motor 122 is stopped for 500 milliseconds (11), reversed for 2 seconds (12), and the retry counter is incremented (13). Subsequently, the motor 122 is stopped again (14) and then rotated in the forward direction (15), and the jam timer is reset and then restarted (16). This is followed by the step 8. At this time, because the step 8 immediately follows the first retry, the program advances to the step 9 determining that the sensor 130 has not turned on. In the step 9, too, the program determines that the jam timer has not exceeded the set value T6 because it immediately follows the restart of the jam timer, returning to the step 1. If the cartridge 112 is successfully transported by the first retry, the sensor 130 turns on before the jam timer exceeds the set value T6. Then, the step 8 is followed by the step 5 for resetting the retry counter. However, if the cartridge 112 fails to regain the expected position despite the first retry, the jam counter exceeds the set value T6 without the sensor 130 turning on. In this case, the second retry, the increment of the retry counter, and the restart of the jam timer are executed (10-16), followed by the step 8. Thereafter, the program executes the same procedure as after the first retry, until the sensor 130 turns on (8) or the jam timer exceeds T6 (9).

If the cartridge 112 fails to regain the correct position even after the second retry, the jam timer again exceeds T6 with the sensor 130 held in the OFF state. This is followed by the third retry, the increment of the retry counter, and the restart of the jam timer. If the third retry fails to restore the cartridge 112 to the expected position, the retray counter is incremented to 3. Then, a jam flag is set (17), the jam indicator is turned on (18), and the motor 122 is deenergized (19). In this condition, the program waits until the operator removes the cartridge 112 jamming the transport path. As soon as the operator removes the jamming cartridge 112 and then closes the door 118, the door open sensor 119 turns off. In response, the steps 1, 2, 3 an 5 are executed to reset the jam flag, turn off the jam indicator, and reset the retry counter.

As stated above, when the transport of the cartridge 112 is disturbed due to some inclination thereof or similar cause, it is restored to a normal condition. Even if such a transport error cannot be removed, a serious condition otherwise brought about by the continuous drive of the motor 122 is eliminated while the operator is informed of the jam.

Assume that a cartridge 112 inserted in a toner near end condition jams the transport path and, therefore, the motor 122 is deenergized. Even in such a condition, the image forming operation itself can be continued with the motor 122 deenrgized or if the jamming cartridge 112 is removed from the transport path. However, the casing 101 will soon run out of toner because the supply of toner from a new cartridge 112 is not available. The illustrative embodiment inhibits the image forming operation by a particular procedure which will be described, as soon as a toner end condition occurs.

Hereinafter will be described a procedure to be executed when a predetermined period of time expires after the leading end of the cartridge 112 has arrived at the feeler 130a of the sensor 130 and before the trailing end thereof moves away from the feeler 130a, shown in FIG. 42. Such a procedure occurs in the latter half of the interval between the times indicated by circled 1 and 2 in FIG. 23.

Specifically, assume that the cartridge 112 inserted into the equipment body is transported in a normal condition without the motor 122 being deenergized by the previously stated jam processing (see FIG. 41, step 19). In this condition, the insert flag is set, and the sensor 130 is in an ON state because the leading end of the cartridge 112 has moved away from the feeler 130 and the left portion of the flange 115a is pressing the feeler 130a downward with the underside thereof. When the leading edge of the cartridge 112 arrives at the feeler 130a to cause the sensor 130 to turn on, steps 1-3 are executed to start a jam timer and then followed by steps 4 and 5 for determining whether or not the sensor 130 has turned on. Specifically, whether or not the leading end of the cartridge 112 has actuated the feeler 130a to turn on the sensor 130 is determined. At this instant, a predetermined period of time is necessary for the trailing end of the cartridge to move away from the feeler 130a, i.e., for the sensor 130 to turn off after the leading end of the cartridge has reached the feeler 130a. Therefore, the program advances from the step 4 to the step 5 to see if the jam timer has exceeded a set value T7 and then returns to the step 1. Thereafter, the steps 1, 2, 4 and 5 are repeated until the answer of the step 5 changes to positive or the answer of the step S4 changes to negative. The set value T7 is the sum of the interval between the time when the sensor 130 turns on due to the arrival of the leading end of the cartridge 112 at the feeler 130a and the time when the trailing end of the cartridge 112 moves away from the feeler 130a and a scattering .alpha.. Whether or not the cartridge 112 has jammed the path around the feeler sensor 130 is determined on the basis of the relation between the content of the jam timer and the set value T7.

So long as the transport of the cartridge 112 is normal, the trailing end of the cartridge 112 moves away from the feeler 130a and, therefore, the sensor 130 turns on before the jam timer exceeds T7. Because the trailing end of the cartridge 112 has already moved away from the free end of the door 118 and the door 118 has regained the closed position, the door open sensor 119 is in OFF state. Hence, the program advances from the step 4 to the steps 6-8 to reset the retry counter. On the other hand, when the cartridge 112 is not transported in a normal condition due to the tilt of the cartridge or similar cause, the jam timer exceeds T7. Then, the step 5 is followed by a step 9 to execute jam processing, as follows.

In the jam processing, the program tries to restore the cartridge 112 to the expected position by repeating the steps of stopping the forward rotation of the motor 122, reversing it, and again causing it to rotate in the forward direction up to, for example, three time while determining whether or not the sensor 130 turns on. If the sensor 130 does not turn on even after the three times of retry, another jam indicator assigned to this kind of jam is turned on while the motor 122 is deenergized. Specifically, whether or not a retry counter assigned to such a jam has exceeded 3 is determined (9). If the answer of the step 9 is NO, the motor 122 is deenergized for 50 milliseconds (10) and then reversed for 2 seconds (11), and the retry counter is incremented (12). Then, the motor 122 is again deenergized (13) and caused into a forward rotation (14). The jam timer is reset (15) and then restarted (15). Thereafter, the program returns to the step 2. At this time, because the step 2 immediately follows the first retry, the program executes the steps 2, 4 and 5 determining that the sensor 130 is in an ON state. In the step 5, too, the program returns to the step 1 determining that the jam timer has not exceeded T7. Then, the steps 1, 2 4 and 5 are repeated until the sensor 130 turns on (S4) or the jam timer exceeds T7 (S5).

If the first retry successfully restores the cartridge 112 to the expected condition, the trailing edge of the cartridge 112 moves away from the feeler 130 to turn off the sensor 130 before the jam timer exceeds T7. Because the trailing end of the cartridge 112 has already moved away from the free end of the door 118 and the door 118 has regained the closed position, i.e., the door open sensor 119 has turned off. In this condition, the step 4 is followed by the steps 6-8 to reset the retry counter. On the other hand, if the transport condition of the cartridge 112 is not corrected despite the first retry, the jam counter exceeds T7 without the senor 130 turning off. Then, the step 5 is followed by the steps 9-15 for effecting the second retry, the increment of the retry counter, and the restart of he jam timer. Thereafter, the steps 1, 2, 4 and 5 are repeated until the answer of the step 4 changes to negative or the answer of the step 5 changes to positive.

If the cartridge 112 fails to regain the expected position even after the second retry, the jam timer again exceeds T7 without the sensor 130 turning off. Then, the step 5 is again followed by the steps 9-15 for effecting the third retry, the increment o the retry counter, and the restart of the jam timer. If the third retry fails to restore the cartridge 112 to the expected position, the retray counter is incremented to 3. Then, a jam flag is set (16), the jam indicator is turned on (17), and the motor 122 is deenergized (18). In this condition, the program waits until the operator removes the cartridge 112 jamming the transport path. As soon as the operator removes the jamming cartridge 112, the sensor 130 turns on and the door open sensor 119 turns off due to the closure of the door 118. In response, the steps 1, 2, 4, 6, 7 and 8 are executed to reset the retry counter. It is to be noted that the turn-off of the jam indicator and the reset of the jam flag are effected on a reset button provided on the equipment. Alternatively, such a resetting operation may be effected automatically by the removal of the jamming cartridge 112, as in the previously stated jam processing.

As stated above, when the transport of the cartridge 112 is disturbed due to some inclination thereof or similar cause, it is restored to a normal condition. If such a transport error cannot be removed, a serious condition otherwise brought about by the continuous drive of the motor 122 is eliminated while the operator is informed of the jam.

Assume that a cartridge 112 inserted in a toner near end condition jams the transport path and, therefore, the motor 122 is deenergized. Even in such a condition, the image forming operation itself can be continued with the motor 122 deenrgized or if the jamming cartridge 112 is removed from the transport path. However, the casing 101 will soon run out of toner because the supply of toner from a new cartridge 112 is not available. The illustrative embodiment inhibits the image forming operation by a particular procedure which will be described, as soon as a toner end condition occurs.

A reference will be made to FIG. 43 for describing jam processing to be executed when the unseal rollers 150 fail to fully remove the seal member 114 from the bottom of the cartridge 112 having been transported to above the hopper opening 124. As the trailing end of the cartridge 112 moves away from the feeler 130a, the sensor 130 is turned off to in turn energize the motor 129 which drives the rollers 150, as stated earlier. The jam processing which will be described occurs in the former half of the interval between the times indicated by circled 2 and 3 in FIG. 23.

Specifically, because the cartridge 112 has been inserted and the insert flag has been set, the program executes a step 2 for determining whether or not the sensor 130 has turned off. If the answer of the step 2 is positive, steps 3-5 are executed to reset the insery flag, set an unseal flag, and start a jam timer assigned to this jam processing, followed by the step 1. Because the insert flag has been reset (3) and the unseal flag has been set (4), the step 1 is followed by steps 6 and 7 for referencing the status of the sensor 130. At this instant, a predetermined period of time is necessary for the free end of the seal member 114 having been removed from the bottom of the cartridge 112 to reach the feeler 130b of the sensor 130 after the start of rotation of the rollers 150. Hence, after the step 7, whether or not a jam timer assigned to this jam processing and started on the turn-off of the sensor 130 has exceeded a set value T8 is determined (8). If the answer of the step 8 is negative, the program returns to the step 1 and repeats the steps 6, 7 and 8 until the jam timer exceeds T8 (8) or the sensor 130 turns on (7). The set value T8 is the sum of the time necessary for the free end of the seal member 114 to reach the feeler 130b after the turn-off of the sensor 130 and a scattering .alpha.. Whether or not the seal member 114 has jammed is determined on the basis of the relation between the content of the jam timer and the set value T8.

If the cartridge 112 is adequately unsealed, the free end of the seal member 114 reaches the feeler 130b to turn on the sensor 130 before the jam timer exceeds T8. Then, the step 7 is followed by a step 9 for resetting a retry counter assigned to this jam processing. On the other hand, assume that the rollers 150 have failed to nip the free end of th seal member 114 accurately and, therefore, to unseal the cartridge 112 in the expected manner. Then, the jam counter exceeds T8. As a result, the step is followed by a step 10 and successive steps for executing jam processing, as follows.

The program tries to restore the free end of the seal member 114 to the expected condition by executing the steps of stopping the motor 129 and deenergizing the pinch solenoid 128 to thereby release the rollers 150 from the seal member 114, and then energizing the pinch solenoid 128 and motor 129 up to, for example, three times while determining whether or not the sensor 130 turns on. If the sensor 130 does not turn on despite the thee times of retry, a jam indicator assigned to this processing is turned on, the motor 129 is deenergized, and the pinch solenoid 128 is deenergized. As a result, the procedure for unsealing the cartridge 112 is interrupted.

In detail, whether or not the retry counter has exceeded 3 is determined (10). If the answer of the step 10 is negative, the motor 129 is deenergized (11), the pinch solenoid 128 is deenergized (12), the retry counter is incremented (13), the pinch solenoid 128 and motor 129 are energized again (14) to start on another retry, the jam timer is reset (16), and then the operation returns to the step 7. At this time, because the step 7 immediately follows the first retry, the program advances to the step 8 determining that the sensor 130 has not turned on. In the step 8, too, because the jam timer has just started, the program returns to the step 1 determining that the jam timer is not greater than T8. Thereafter, the steps 1, 6, 7 and 8 are repeated until the sensor 130 turns on (7) or the jam timer exceeds T8 (8).

If the cartridge 112 is successfully unsealed by the first retry, the sensor 130 turns on before the jam timer exceeds T8. Then the step 7 is followed by the step 9 for resetting the retry counter. However, if the seal member 114 being stripped from the cartridge 112 is in an inadequate condition, the jam timer exceeds T8 without the sensor 130 turning on. At this time, the step 8 is followed by the steps 10-16 for executing the second retry, the increment of the retry counter, and the restart of the jam timer. Subsequently, the program repeats the steps 1, 6, 7 and 8 until the sensor 130 turns on (7) or the jam timer exceeds T8 (8). When the seal member 114 is not restored to the expected condition even after the second retry, the jam timer again exceeds T8 without the sensor 130 turning on. Then, the step 8 is followed by the steps 10-16 to effect the third retry, the increment of the retry counter, and the restart of the jam timer, followed by the step 7. When even the third retry fails to restore the seal member 144 to the expected condition, the step 10 is followed by a step 17 because the retry counter is 3. In the step 17, a jam flag assingned to this routine is set. Thereafter, a jam indicator is turned on (step 18), the motor 129 is turned off (19), and the pinch solenoid 128 is deenergized (20). In this condition, the program waits until the operator removes the cartridge 112 from the toner supply position.

When the operator removes the jamming cartridge 112 from the transport path and then inserts it again, the insert flag is set again. Then, the jam detection described above is repeated.

As stated above, when, for example, the unseal rollers 150 fail to accurately nip the free end of the seal member 114 and, therefore, to fully unseal the cartridge 112, the embodiment restores the seal member 114 to the expected condition. When the seal member 114 cannot regain the expected condition despite the retry or retries, a critical jam of the seal member or that of the cartridge 112 ascribable to the continuation of the unsealing operation is eliminated while the operator is informed of the jam.

Now, it may occur that after the free end or leading end of the seal member 114 has reached the feeler 130b of the sensor 130, the trailing end of the same may fail to move away from the feeler 130b and stay at the feeder 130b. Then, another jam processing shown in FIG. 44 is executed. This jam processing occurs in the latter half of the interval between the times indicated by circled 2 and 3 in FIG. 23.

Specifically, so long as the cartridge 112 is disposed above the hopper opening 124 and the unsealing operation is continued on the basis of the above stated jam processing, the unseal flag is set. In this condition, the free end of the seal member 114 has moved away from the feeler 130b, and the part of the seal member 114 having removed from the bottom of the cartridge 112 is pressing the feeler 130b downward. Hence, the sensor 130 is in an ON state. At the time when the free end of the seal member 144 arrives at the feeler 130b to turn on the sensor 130, steps 1, 2 and 3 are executed to start a jam timer assigned to this routine is started. The step 2 is followed by a step 4 to see if the sensor 130 is in an ON state. Here, a predetermined period of time is necessary for the trailing end of the seal member 114 to move away from the feeler 130b and therefore turn off the sensor 130 after the free or leading end of the same has arrived at the feeler 130b. Hence, the step 4 is followed by a step 5 to determined whether or not the jam timer having started on the turn-on of the timer 130 is greater than a set value T9. Thereafter, the steps 1, 2, 4 and 5 are repetitively executed until the answer of the step 4 changes to negative or the answer of the step 5 changes to positive. The set time T9 is the sum of the time necessary for the trailing end of the seal member 114 to move away from the feeler 130b after the sensor 130 has turned on due to the arrival of the leading end of the seal member 114 at the feeler 130b and a scattering .alpha.. Whether or not the seal member 114 being peeled off has jammed is determined on the basis of the relation between the content of the jam timer and the set value T9.

So long as the cartridge 112 is removed in an adequate manner, the trailing end of th seal member 114 moves away from the feeler 130b to turn off the sensor 130 before the jam timer exceeds the set time T9. Then, the step 4 is followed by steps 6 and 7 to reset a retry counter assigned to this routine. Subsequently, the unseal flag is reset (8), and a toner near end flag is set (9). Assume that the cartridge 112 is not unsealed in the expected manner because, for example, the rollers 150 have failed to accurately nip the seal member 11 therebetween. Then the jam timer exceeds T9 without the sensor 130 turning off. At this time, the step 5 is followed by a step 10 and successive steps for executing jam processing.

Specifically, the program tries to restore the nipping condition of the rollers 150 to normal by repeating the steps of denergizing the motor 129 and pinch solenoid 8 to thereby release the seal member 114 from the rollers 150, and again energizing the pinch solenoid 128 and motor 129 up to, for example, three times while determining whether or not the sensor 130 turns off. If the sensor 130 remains in an ON state even after the three times of retry, and exclusive jam indicator for this routine is turned on while the motor 129 and pinch solenoid 128 are deenergized to interrupt the unsealing operation.

In detail, whether or not the retry counter has exceeded 3 is determined (10). If the answer o the step 10 is negative, the motor 129 is deenergized (11), pinch solenoid 128 is turned off (12), the retry counter is incremented (13), the pinch solenoid 128 is turned on again (14), the motor 129 is energized to start on another retry (15), the jam timer is reset (16), and then the operation returns to the step 2. At this time, because the step 2 immediately follows the first retry, the program advances to the steps 4 and 5 determining that the sensor 130 is in an ON state. In the step 5, too, the program determined that the jam timer is not greater than T9 because the jam timer has just restarted. Thereafter, the steps 1, 2, 4 and 5 are repeated until the answer of the step 4 changes to negative or the answer of the step 5 changes to positive.

If the unsealing operation is restored to normal by the first retry, the trailing end of the seal member 114 moves away from the feeler 130a to cause the sensor 130 to turn on before the jam timer exceeds T9. Therefore, the step 4 is followed by the steps 6-9. If the unsealing operation is not restored to normal even after the first retry, the jam timer exceeds T9 without the senor 130 turning off. Then, the step 5 is followed by the step 10 and steps 11-16 for effecting the second retry, the increment of the retry counter, an the restart of the jam timer. Subsequently, the steps 2, 4 and 5 are repeated until the answer of the step 4 changes to negative or the answer of the step 5 changes to positive.

If the second retry has failed to correct the unsealing condition, the jam timer again exceeds T9 without the sensor 130 turning on. Then, the step 5 is followed by the step 10 and then by the steps 11-16 for executing the third retry, the increment of the retry counter, and the restart of the jam timer. Thereafter, the program returns to the step 2. When even the third retry is not successful, the step 10 is followed by a step 17 for setting a jam flag because the retry counter has been incremented to 3. Subsequently, a jam indicator is turned on (18), the motor 129 is turned off (19), and the pinch solenoid 128 is turned off (20). In this condition, the program waits until the operator removes the cartridge 112 from the toner supply position. After the operator has removed the cartridge 112 from the supply position and inserted it again into the equipment body, the cartridge 112 is transported to the supply position. As the unsealing operation begins again, the program repeats the above-stated sequence of steps again for detecting a jam.

As stated above, when the cartridge 112 is not properly unsealed due to, for example, the incomplete operation of the rollers 150, a proper unsealing condition can be set up. Even if the cartridge 112 cannot be restored to the proper condition, a serious jam of the seal member 114 or that of the cartridge 112 ascribable to the contination of the unsealing operation is eliminated while the operator is informed of this kind of jam.

FIG. 45 shows a jam detection procedure which corresponds to the former half of the tims [I] and [II ] of FIG. 24 and associated with the fall of the cartridge 112 into the hopper opening 124. The processing of FIG. 45 determines whether or not the trailing end of the cartridge 112 (in the direction of insertion) reaches the feeler 130a in a predetermined period of time after the motor 212 has been reversed to start transporting the cartridge 112 from the hopper opening 124 to the collecting box 133.

Because the reverse transport from the hopper opening 124 toward the collecting box 133 has been started on the detection of a toner end condition, the program executes steps 1-3 for starting a fall 1 jam timer and a fall 1 flag, returns to the step 1, and then advances to a step 4 to see if the sensor 130 is in an ON state. At this instant, a predetermined period of time is necessary for the trailing end of the cartridge 112 to reach the feeler 130 to thereby cause the sensor 130 to turn on after the start of the reverse transport. Hence, the program executes a step 5 to see if the fall 1 jam timer has exceeded a set value T3. Thereafter, the steps 1, 4 and 5 are repeated until the answer of the step 4 or that of the step 5 changes to positive. The set value T3 is the sum of the time necessary for the trailing end of the cartridge 112 to reach the feeler 130a after then turn-on of a toner near end signal during the reverse transport and a scattering .alpha.. Whether or not the cartridge 122 has jammed the transport path is determined on the bases of the relation between the content of the fall 1 jam timer and the set value T3.

When the cartridge 112 is in normal transport in the reverse direction, the trailing end of the cartridge 112 reaches the feeler 130a to cause the sensor 130 to turn on before the fall 1 jam timer exceeds T3. Hence, the step 4 is followed by a step 6 for resetting a fall 1 retry counter. If the reverse transport of the cartridge 112 is not proper due to, for example, the tilt of the cartridge 112, the fall 1 jam timer exceeds T3 with the result that the step 5 is followed by a step for executing jam processing. Briefly, this processing tries to correct the transport condition, e.g., the tilt of the cartridge 112 by repeating the steps of stopping the reverse rotation of the motor 122, causing it to rotate in the forward direction, and then causing it to rotate in the reverse direction up to, for example, three times while determining whether or not the sensor 130 turns on. If the sensor 130 does not turn on even after the three times of retry, a fall 1 jam indicator is turned on while the motor 122 is turned off.

Specifically, Whether or not the fall 1 retry counter has exceeded 3 is determined (7). If the answer of the step 7 is negative, the motor 122 is deenergized for 500 milliseconds (8) and then rotated in the forward direction (9), and the fall 1 retry counter is incremented (10). Subsequently, the motor 122 is deenergized again (11) and then rotated in the reverse direction (12), the fall 1 jam timer is reset and then restarted (13). Then, the operation returns to the step 4. At this time, because the step 4 immediately follows the first retry, the program advances to the step 5 determining that the sensor 130 is not in an ON state. In t