US20060261543A1 - Sheet stacking apparatus and image forming apparatus - Google Patents

Sheet stacking apparatus and image forming apparatus Download PDF

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Publication number
US20060261543A1
US20060261543A1 US11/430,988 US43098806A US2006261543A1 US 20060261543 A1 US20060261543 A1 US 20060261543A1 US 43098806 A US43098806 A US 43098806A US 2006261543 A1 US2006261543 A1 US 2006261543A1
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US
United States
Prior art keywords
sheets
sheet
stack tray
stacked
sheet stack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/430,988
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English (en)
Inventor
Toshiyuki Miyake
Mitsushige Murata
Takayuki Fujii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURATA, MITSUSHIGE, FUJII, TAKAYUKI, MIYAKE, TOSHIYUKI
Publication of US20060261543A1 publication Critical patent/US20060261543A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H39/00—Associating, collating, or gathering articles or webs
    • B65H39/10—Associating articles from a single source, to form, e.g. a writing-pad
    • B65H39/11—Associating articles from a single source, to form, e.g. a writing-pad in superposed carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/24—Pile receivers multiple or compartmented, e.d. for alternate, programmed, or selective filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
    • B65H43/06—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable detecting, or responding to, completion of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2408/00—Specific machines
    • B65H2408/10—Specific machines for handling sheet(s)
    • B65H2408/11—Sorters or machines for sorting articles
    • B65H2408/113—Sorters or machines for sorting articles with variable location in space of the bins relative to a stationary in-feed path
    • B65H2408/1131—Sorters or machines for sorting articles with variable location in space of the bins relative to a stationary in-feed path and variable bin capacity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/30—Numbers, e.g. of windings or rotations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B65H2513/42—Route, path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/06—Office-type machines, e.g. photocopiers

Definitions

  • the present invention relates to a sheet stacking apparatus for stacking sheets output from an image forming apparatus such as a copying machine, printer or facsimile, particularly to a sheet stacking apparatus so that all stack trays can stack the maximum number of sheets to be stacked to prevent the number of sheets to be stacked of the whole apparatus and decrease the number of temporary interrupt times of jobs and an image forming apparatus having the sheet stacking apparatus.
  • a sheet processing apparatus as a sheet stacking apparatus which successively conveys sheets in which an image is recorded by an image forming apparatus into the sheet processing apparatus and selectively applies predetermined processing such as punch processing, stapling or sorting.
  • Some of the sheet processing apparatus respectively have a plurality of sheet stack trays (stack trays) capable of performing vertical movement.
  • the sheet stack tray is movement-controlled so that an uppermost surface of the sheets stacked on the stack tray keeps a constant position from a discharge outlet for discharging sheets.
  • a user sets a sheet stack tray to be used every job such as copying, FAX or printing and can switch sheet stack trays when the job is executed.
  • a sheet processing apparatus as a sheet stacking apparatus having two sheet stack trays capable of vertical movement sometimes cannot stack sheets up to the maximum number of sheets to be stacked on an upper sheet stack tray after stacking sheets up to the maximum number of sheets to be stacked on a lower sheet stack tray.
  • the upper sheet stack tray is controlled in movement before stacking sheets up to the maximum number of stacking sheets as described above. Therefore, the number of sheets to be stacked in a sheet processing apparatus is decreased.
  • An object of the present invention is to make it possible that all sheet stack trays can stack sheets up to the maximum number of sheets to be stacked, prevent the number of sheets to be stacked from decreasing in the whole sheet processing apparatus and decrease the temporary number of interrupt times.
  • Another object of the present invention is to be possible to stack sheets up to the maximum number of sheets to be stacked on all sheet stack trays of a sheet processing apparatus. Therefore, it is possible to prevent the number of sheets to be stacked in the whole sheet processing apparatus from decreasing. Moreover, because it is possible to decrease the number of temporary interrupt times of jobs, the sheet processing efficiency is not deteriorated.
  • a further object of the present invention is to provide a sheet stacking apparatus capable of stacking sheets using a plurality of sheet stack trays by switching with each other, including a plurality of sheet stack trays each of which moves to keep an uppermost surface of sheets stacked on the sheet stack tray in a constant position from a sheet discharge outlet when sheets are discharged on each of said plurality of sheet stack trays, wherein said plurality of sheet stack trays include: a first sheet stack tray, when the maximum number of sheets which are allowed to be stacked on said first sheet stack tray have been stacked thereon, which is which prevented from stacking on another sheet stack tray at least until another maximum number of sheets which are allowed to be stacked on another sheet stack tray are stacked; and a second sheet stack tray, when the maximum number of sheets which are allowed to be stacked on said second sheet stack tray have been stacked thereon, which is not prevented from stacking on another sheet stack tray at least until another maximum number of sheets which are allowed to be stacked on another sheet stack tray are stacked, wherein in a case where the number
  • a further object of the present invention to provide an image forming apparatus including an image forming part which forms an image on a sheet; and a sheet stacking apparatus which stacks a sheet on which an image is formed by the sheet forming part, wherein said sheet stacking apparatus capable of using a plurality of sheet stack trays by switching with each other, wherein said sheet stacking apparatus includes a plurality of sheet stack trays each of which moves to keep an uppermost surface of sheets stacked on the sheet stack tray in a constant position from a sheet discharge outlet when sheets are discharged on each of said plurality of sheet stack trays, wherein said plurality of sheet stack trays includes: a first sheet stack tray, when the maximum number of sheets which are allowed to be stacked on said first sheet stack tray have been stacked thereon, which is prevented from stacking on another sheet stack tray at least until another maximum number of sheets which are allowed to be stacked on another sheet stack tray are stacked; and a second sheet stack tray, when the maximum number of sheets which are allowed to be stacked on said second sheet stack tray have been
  • FIG. 1 is a schematic sectional view showing a general configuration of an image forming apparatus of an embodiment of the present invention
  • FIG. 2 is a block diagram showing a configuration of a controller for controlling the whole of an image forming apparatus
  • FIG. 3 is a schematic sectional view of an image forming apparatus showing a flow of a sheet for face-up discharge
  • FIG. 4 is a schematic sectional view of an image forming apparatus showing a flow of a sheet when processed
  • FIG. 5 is a sectional view of an essential part showing a configuration of a stack tray of a sheet processing apparatus
  • FIGS. 6A, 6B , 6 C and 6 D are illustrations of the switching operation of a stack tray due to occurrence of stack-over;
  • FIG. 7 is an illustration of a state of a stack tray when sheets of the maximum number of sheets are stacked
  • FIG. 8 is an illustration of a state of stack trays when a stack limit occurs
  • FIGS. 9A, 9B , 9 C, 9 D, 9 E and 9 F are operational illustrations in which two tack trays respectively stack up to the maximum number of sheets;
  • FIG. 10 is a flowchart for switching stack trays in which two stack trays respectively stack up to the maximum number of sheets.
  • FIG. 1 is a sectional view showing an internal structure of the whole of an image forming apparatus which is an embodiment of the present invention.
  • an image forming apparatus 10 has a printer 100 serving as an image forming part and an image reader 200 serving as an image reading part. Moreover, the image forming apparatus 10 has a document feeder 400 , finisher 500 serving as a sheet stacking apparatus and operation display part 600 .
  • the document feeder 400 is mounted on the image reader 200 .
  • the document feeder 400 separates and feeds originals set on an original tray upwards one by one from the top page in the left direction of the figure in order. Then, the document feeder 400 stops the originals at a predetermined position on a platen glass 202 through a curved path. Under this state, images of the originals are read by moving a scanner unit 201 from left to right for scanning.
  • the scanner unit 201 performs scanning, the reading surface of an original is irradiated with the light of a lamp of the scanner unit 201 and the light reflected from the original is led to a lens through a mirror. The light passing through the lens is imaged on the image pickup surface of an image sensor 203 .
  • the optically-read image is converted into image data by the image sensor 203 and output.
  • Predetermined processing is applied to the image data output from the image sensor 203 by an image signal control part 281 to be described later (refer to FIG. 2 ) and then the image data is input to the exposure control part 101 of the printer 100 as a video signal.
  • the exposure control part 101 of the printer 100 modulates a laser beam in accordance with the input video signal and outputs the laser beam.
  • This laser beam is irradiated onto a photosensitive drum 102 while being scanned by a not-illustrated polygon mirror or the like.
  • An electrostatic latent image corresponding to the scanned laser beam is formed on the photosensitive drum 102 .
  • the electrostatic latent image on the photosensitive drum 102 is visualized as a developer image by a developer supplied from a development counter 103 .
  • Sheets are selectively supplied from a cassette 111 or 112 or manual feed tray 113 . These sheets are led to a conveying path and once stopped by the front end of each sheet being anti-climbed against a registration roller 114 . Thereafter, the sheets are conveyed between the photosensitive drum 102 and a transfer part 104 at the timing synchronous with start of irradiation of the laser beam. The developer image formed on the photosensitive drum 102 is transferred onto a sheet supplied by the transfer part 104 . Moreover, because the sheets are once stopped by the front end of each sheet being anti-climbed against the registration roller 114 , a tilt of each sheet is corrected.
  • a sheet on which the developer image is transferred is conveyed to a fixing portion 105 , which pressurizes the sheet by heat to fix the developer image on the sheet.
  • the sheet passing through the fixing portion 105 is brought out from the printer 100 to the finisher 500 through a discharge roller 116 by a flapper 118 . In this case, the sheet is brought out in a face-up state in which the image surface of the sheet is turned upwards.
  • the sheet is brought to a sheet reverse conveying path 119 by a conveying roller 115 by the printer switching a flapper 118 when the sheet passes through the fixing portion 105 . Then, by the printer switching back the sheet, the surface of the sheet is reversed and discharged from the printer 100 to the finisher 500 through the discharge roller 116 .
  • the sheet discharged from the printer 100 is sent to the finisher 500 .
  • the finisher 500 can selectively apply stapling or sorting to bundle of sheets. In the case of this processing, it is possible to select or cancel the staple mode or sorting mode by the operation display part 600 .
  • the flapper 518 is switched and the sheet is discharged to a stack tray 510 by a conveying roller 517 via a non-sorting path 516 .
  • FIG. 4 conveying of a sheet when sorting or stapling is set to a sheet is described below by referring to FIG. 4 .
  • the surface and back of the sheet are reversed by the switching back conveyance and the sheet is discharged from the printer 100 to the finisher 500 in a face-down state.
  • the sheet is discharged from discharge rollers 501 and 502 of the finisher 500 onto a bundle discharge belt 503 .
  • a intermediate-processing tray 508 having a low friction is set to a position several millimeters higher than the bundle discharge belt 503 in parallel with the belt 503 and for accurately speaking the sheet is discharged to the intermediate-processing tray 508 .
  • the discharged sheet drops downwards in the right direction of the figure along the slantly set intermediate-processing tray 508 (bundle discharge belt 503 ) by its dead weight. Moreover, when a sector return roller 504 rotates counterclockwise, a friction member set to the return roller 504 like a circular arc contacts with the sheet, drops the sheet in the right downward direction and makes an end of the sheet anti-climb a stopper plate 507 . Thereby, arrangement of sheets in the longitudinal direction (feed direction) is performed.
  • a matching plate 506 is set to this side and recessed side on the intermediate processing tray 508 and driven whenever the sheet is discharged onto the intermediate processing tray 508 and transverse-directional (width-directional) arrangement is applied to the sheets on the intermediate processing tray 508 . Furthermore, when a predetermined number of sheets is discharged and stacked onto the intermediate processing tray 508 , the bundle discharge belt 503 is driven and the sheets are discharged onto a stack tray 510 or 511 serving as a sheet stack tray.
  • sheets forming a sheet bundle to be stapled are discharged onto the intermediate processing tray 508 , the sheets are arranged by the return roller 504 and matching plate 506 and then the staple operation is performed by driving a stapler 505 .
  • the stapled sheet bundle is discharged onto the stack tray 510 or 511 by the bundle discharge belt 503 .
  • the stapler 505 is movable in the transverse direction (width direction) from the sheets on the intermediate processing tray 508 and perform the staple operation at optional positions of this side and recessed side.
  • a position for applying stapling to a sheet is set by the operation display part 600 .
  • FIG. 2 is a block diagram showing a configuration of the controller for controlling the whole of the image forming apparatus in FIG. 1 .
  • the controller has a CPU circuit part 150 and the CPU circuit part 150 includes a CPU (not illustrated), ROM 151 and RAM 152 . Then, blocks 480 , 280 , 281 , 282 , 283 , 180 , 680 and 580 are generally controlled by a control program stored in the ROM 151 . Moreover, the RAM 152 temporarily holds control data and moreover, used as an operation area for the processing for control.
  • the document feeder control part 480 drives the document feeder 400 in accordance with a designation from the CPU circuit part 150 .
  • the image reader control part 280 drives the above scanner unit 202 and image sensor 203 and transfers an analog image signal output from the image sensor 203 to the image signal control part 281 .
  • the image signal control part 281 applies various processes after converting an analog image signal from the image sensor 203 into a digital signal, converts the digital signal into a video signal and outputs the video signal to the printer control part 180 .
  • the image signal control part 281 also applies various processes to the digital image signal input from the computer 283 through the external I/F 282 , converts the digital image signal into a video signal and outputs the video signal to a printer control part 180 .
  • the processing by the image signal control part 281 is controlled by the CPU circuit part 150 .
  • the printer control part 180 drives the above exposure control part 101 in accordance with the input video signal.
  • the operation-display control part 680 exchanges information between the operation display part 600 and the CPU circuit part 150 .
  • the operation display part 600 has a plurality of keys for setting various functions on image formation and a display part for displaying the information showing a set state. Then, the operation display part 600 outputs a key signal corresponding to the operation of each key to the CPU circuit part 150 and displays corresponding information on the display part in accordance with a signal from the CPU circuit part 150 .
  • the finisher control part 580 is mounted on the finisher 500 to drive the whole of the finisher by exchanging information with the CPU circuit part 150 .
  • the stack trays 510 and 511 are sheet stack trays for stacking the sheets discharged from the intermediate processing tray 508 of the finisher 500 .
  • the stack trays 510 and 511 respectively perform vertical movement by using a not-illustrated motor as a driving source.
  • sheet surface detection sensors 514 and 515 having a not-illustrated light emitting part and light receiving part respectively detect the uppermost surface of the sheets on the stack trays 510 and 511 .
  • the stack trays 510 and 511 vertically move stack trays in accordance with inputs from the sheet surface detection sensors 514 and 515 to keep the uppermost surface position (sheet stack surface) to the sheet discharge outlet to which sheets are discharged.
  • sheet presence/absence detection sensors 512 and 513 detect presence or absence of sheets on the stack trays 510 and 511 .
  • the number of sheets to be stacked on each of the stack trays 510 and 511 is obtained by counting the number of sheets to be discharged to each of the stack trays 510 and 511 .
  • the maximum number of sheets to be stacked on the stack trays depends on the type or size of a sheet. Therefore, for example, when using one A4-size plain sheet, weighting is performed in accordance with the type or size of sheets stacked on a stack tray by assuming one A3-size plain sheet as 1 and one A4-size cardboard as 1.5 to count the number of sheets to be discharged.
  • the maximum number of sheets to be stacked on a stack tray is obtained by counting and weighting the number of sheets to be discharged.
  • the sheet stack surface of the stack tray 510 is located at the discharge outlet of a non-sort path 516 and the sheet stack surface of the stack tray 511 is located at the discharge outlet of the intermediate processing tray 508 .
  • a non-sort job is discharged to the stack tray 510 and a job for performing stapling or sorting is discharged to the stack tray 511 .
  • Switching of the stack trays includes a case of switching stack trays when reaching the maximum number of sheets to be stacked of a stack tray when discharging sheets and a case of switching stack trays by setting a job every mode.
  • sheet bundles are stacked on the stack tray 510 .
  • sheet bundles are stacked on the stack tray 510 .
  • stacking of sheets on the stack tray 510 is prohibited and an image forming job in the image forming apparatus is interrupted.
  • the image forming job is interrupted after stacking of all sheets forming a sheet bundle is completed to switch stack trays. This is because when switching stack trays while discharging sheets forming a sheet bundle, a sheet bundle is stacked on two stack trays. Therefore, as described above, the image forming job is interrupted after the image forming apparatus discharges up to the final page of a sheet bundle to start switching of stack trays.
  • the number of sheets which can be stacked by exceeding the maximum number of sheets to be stacked of the stack tray 510 as a margin is limited.
  • the image forming job is interrupted, removing of sheets from the tack tray 510 by informing means such as the operation display part 600 is urged to a user, it is confirmed by the sheet presence/absence detection sensor 512 that sheets on the stack tray 510 are gone out and then the image forming job is restarted.
  • the scheduled number of sheets to be stacked on the stack tray 510 every sheet bundle from job set content, compare the number of sheets to be stacked for a unit of sheet bundle with the maximum number of sheets to be stacked on the stack tray 510 , interrupt the image forming job when discharge of sheet bundle one before a sheet bundle when it is determined that the maximum number of sheets to be stacked is exceeded, urge the user to remove sheets from the stack tray 510 by the informing means such as the operation display part 600 , confirm by the sheet presence/absence detection sensor 512 that the sheets on the stack tray 510 are gone out and restart the image forming job.
  • the present state is switched to discharging to the stack tray 511 . Therefore, rise of the stack trays 510 and 511 is started.
  • the stack tray 501 is moved up to the evacuation position above the discharge outlet of the intermediate processing tray 508 and the sheet stack surface of the stack tray 511 is moved up to the discharge outlet of the intermediate processing tray 508 in accordance with an output of the sheet surface detection sensor 514 .
  • a not-illustrated shutter closes the discharge outlet of the intermediate processing tray 508 to prevent the sheets stacked on the stack tray 510 from backing up from the discharge outlet of the intermediate processing tray 508 .
  • the image forming job is interrupted and it is communicated by the operation display part 600 to a user to remove sheets from the stack trays.
  • the image forming job is restarted.
  • the operation after restarting the image forming job means that the operation described above by referring to FIG. 6 is repeated up to completion of the image forming job.
  • stack trays are switched in accordance with setting every job mode.
  • a user can previously perform the setting of a stack tray to which an output is discharged every job mode, by the operation display part 600 .
  • a stack tray set every job mode is different from a stack tray at the discharge outlet in performing a job, the job stack tray is vertically moved and stack trays are switched.
  • FIG. 7 shows states of a stack tray and stacked sheets when stacking the maximum number of sheets is performed on the stack trays 510 and 511 in the sheet processing apparatus.
  • FIG. 8 when the maximum number of sheets which are allowed to be stacked on the stack tray 511 have been stacked on the stack tray 511 before the maximum number of sheets which are allowed to be stacked on the stack tray 510 are stacked on the stack tray 510 , downward movement of the stack tray 510 is restricted at the discharge outlet of the intermediate processing tray 508 .
  • the stack tray 511 is switched to the stack tray 510 before sheets are stacked on the stack tray 511 until a limit in which the stack restriction on the stack tray 510 occurs to stack up to the maximum number of sheets to be stacked on the stack tray 510 .
  • the stack tray 510 even if the maximum number of sheets to be stacked is stacked on the switched stack tray 510 , when the stack tray 510 does not prevent stacking of sheets up to the maximum number of sheets to be stacked on the stack tray 511 which is a sheet stack tray other than the stack tray 510 , sheets are stacked as described below by switching these two stack trays.
  • the number of sheets to be stacked on the switched stack tray 510 reaches the maximum number of sheets, stacking of sheets on the switched stack tray 510 is prohibited and sheets are stacked by switching the stack tray 510 to the stack tray 511 which is a sheet track tray other than the stack tray 510 .
  • the stack trays 510 and 511 can respectively stack up to the maximum number of sheets to be stacked.
  • FIGS. 9A to 9 F are operational illustrations for stacking sheets up to the maximum number of sheets on each of the stack trays 510 and 511 .
  • FIG. 10 is a flowchart of tray switching control when stacking sheets up to the maximum number of sheets to be stacked.
  • a sheet bundle is stacked on the stack tray 511 depending on the initial state as shown in FIG. 9A (S 1002 ).
  • a sheet bundle can be stacked up to the maximum number of sheets to be stacked of the whole of the finisher.
  • sheets can be stacked on only the stack tray 511 .
  • First Copy Output Time FCOT may occur or productivity may lower. Therefore, switching of stack trays is not performed at this point of time.
  • sheets are stacked on the stack tray 510 up to a predetermined number of sheets (predetermined quantity) which does not prevent stacking of sheets on the stack tray 510 up to the maximum number of sheets to be stacked (S 1003 ).
  • predetermined quantity a predetermined number of sheets which does not prevent stacking of sheets on the stack tray 510 up to the maximum number of sheets to be stacked
  • S 1004 it is determined in S 1004 whether sheets for forming a sheet bundle are currently discharged. That is, when sheets are stacked on the stack tray 511 up to a predetermined number of sheets and sheets for forming a sheet bundle are currently discharged, stacking of sheets is continued up to a break between stacks of sheets (S 1005 ). However, when sheets are stacked up to the break between stacks of sheets, the image forming job is interrupted (S 1006 ) and stacking of sheets on the stack tray 511 is temporarily prohibited (S 1007 ).
  • lowering is started with the stack trays 510 and 511 (S 1008 ).
  • the stack tray 511 is evacuated up to the lowest point to which the stack tray 511 can move to lower the sheet stack surface of the stack tray 510 up to the discharge outlet of the intermediate processing tray 508 in accordance with an output of the sheet surface detection sensor 514 .
  • the mage forming job which has been interrupted is restated (S 1009 )
  • stacks of sheets are discharged to the stack tray 510 as shown in FIG. 9C and stacked (S 1010 ).
  • stacking is continued until the number of sheets to be stacked on the stack tray 510 reaches the maximum number of sheets (S 1011 ).
  • the maximum number of sheets to be stacked is stacked on the stack tray 510 .
  • the image forming job is interrupted (S 1014 ) to prohibit stacking of sheets on the stack tray 510 (S 1015 ) as shown in FIG. 9D .
  • stack prohibition to the stack tray 511 is cancelled (S 1016 ) and the stack trays 510 and 511 are raised as shown in FIG. 9E (S 1017 ).
  • the stack tray 510 is moved to the evacuation position above the discharge outlet of the intermediate processing tray 508 and the sheet stack surface of the stack tray 511 is raised up to the discharge outlet of the intermediate processing tray 508 in accordance with an output of the sheet surface detection sensor 514 .
  • the image forming job which has been interrupted is restarted (S 1018 ) to start stacking of sheets on the stack tray 511 as shown in FIG. 9F (S 1019 ).
  • the maximum number of sheets to be stacked is stacked on the stack tray 510 as described above, it is possible to stack up to the maximum number of sheets on the switched stack tray 511 . Thereby, even when the processing such as stapling or sorting is set, it is possible to stack up to the maximum number of sheets on both the stack trays 510 and 511 as shown in FIG. 7 .
  • a copying machine is described as an image forming apparatus.
  • the present invention is not restricted to the above case.
  • it is also possible to use another image forming apparatus such as one of a printer and facsimile system or composite system obtained by combining these functions.
  • the same advantage can be obtained by applying the present invention to a sheet processing apparatus as a sheet stacking apparatus used for the image forming apparatus.
  • a sheet processing apparatus as a sheet stacking apparatus which can be set to or removed from the image forming apparatus.
  • the present invention is not restricted to the above case. It is also allowed to use a sheet processing apparatus as a sheet stacking apparatus integrated with the image forming apparatus. By applying the present invention to the sheet processing apparatus, the same advantage can be obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pile Receivers (AREA)
  • Paper Feeding For Electrophotography (AREA)
US11/430,988 2005-05-13 2006-05-10 Sheet stacking apparatus and image forming apparatus Abandoned US20060261543A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-140708(PAT. 2005-05-13
JP2005140708A JP2006315812A (ja) 2005-05-13 2005-05-13 シート処理装置及び画像形成装置

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US20100156024A1 (en) * 2008-10-29 2010-06-24 Kabushiki Kaisha Toshiba Image forming apparatus and method for selecting discharge destination for sheet of image forming apparatus
US20100302567A1 (en) * 2009-05-28 2010-12-02 Canon Kabushiki Kaisha Information processing apparatus, method for controlling the information processing apparatus, and control program therefor
US7942413B2 (en) 2007-11-14 2011-05-17 Konica Minolta Business Technologies, Inc. Image forming apparatus provided with output tray and control method thereof
EP2060952A3 (en) * 2007-11-07 2012-05-16 Konica Minolta Business Technologies, Inc. Image forming apparatus
US20150078797A1 (en) * 2013-09-17 2015-03-19 Canon Kabushiki Kaisha Image forming apparatus
US20150110538A1 (en) * 2012-04-18 2015-04-23 Canon Kabushiki Kaisha Sheet storage device and image forming apparatus
US20150151944A1 (en) * 2013-12-03 2015-06-04 Kyocera Document Solutions Inc. Post-processing device and image forming system including this post-processing device
CN105034616A (zh) * 2014-05-01 2015-11-11 佳能株式会社 片材堆叠装置及片材堆叠装置的控制方法
US10416934B2 (en) * 2017-05-22 2019-09-17 Canon Kabushiki Kaisha Control device for controlling an image forming system, image forming system and storage medium
US10518999B2 (en) 2017-05-22 2019-12-31 Canon Kabushiki Kaisha Control device for controlling an image forming system having an image forming apparatus and a sheet stacking apparatus
US10745232B2 (en) * 2018-03-09 2020-08-18 Ricoh Company, Ltd. Image forming apparatus, image forming method, and non-transitory computer-readable storage medium
US10754284B2 (en) 2017-05-22 2020-08-25 Canon Kabushiki Kaisha Control apparatus for controlling system including image forming apparatus and sheet discharge apparatus
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US10518999B2 (en) 2017-05-22 2019-12-31 Canon Kabushiki Kaisha Control device for controlling an image forming system having an image forming apparatus and a sheet stacking apparatus
US10754284B2 (en) 2017-05-22 2020-08-25 Canon Kabushiki Kaisha Control apparatus for controlling system including image forming apparatus and sheet discharge apparatus
US10947075B2 (en) 2017-05-22 2021-03-16 Canon Kabushiki Kaisha Control apparatus and control method for controlling an image forming system, and storage medium
US10974920B2 (en) 2017-05-22 2021-04-13 Canon Kabushiki Kaisha Control device for controlling an image forming system
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US11336785B2 (en) * 2019-11-27 2022-05-17 Canon Kabushiki Kaisha Sheet discharging apparatus, sheet processing apparatus, and image forming system
US11336786B2 (en) * 2020-03-11 2022-05-17 Canon Kabushiki Kaisha Sheet discharging apparatus, sheet processing apparatus, and image forming system

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