WO2024080278A1 - シート積載装置、画像形成システム及び情報処理装置 - Google Patents

シート積載装置、画像形成システム及び情報処理装置 Download PDF

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Publication number
WO2024080278A1
WO2024080278A1 PCT/JP2023/036751 JP2023036751W WO2024080278A1 WO 2024080278 A1 WO2024080278 A1 WO 2024080278A1 JP 2023036751 W JP2023036751 W JP 2023036751W WO 2024080278 A1 WO2024080278 A1 WO 2024080278A1
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WO
WIPO (PCT)
Prior art keywords
sheets
loading
sheet
loaded
section
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.)
Ceased
Application number
PCT/JP2023/036751
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English (en)
French (fr)
Japanese (ja)
Inventor
直樹 清水
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 Finetech Nisca Inc
Original Assignee
Canon Finetech Nisca 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 Finetech Nisca Inc filed Critical Canon Finetech Nisca Inc
Priority to JP2024551694A priority Critical patent/JPWO2024080278A1/ja
Priority to CN202380070931.6A priority patent/CN119998218A/zh
Priority to EP23877281.8A priority patent/EP4603437A1/en
Publication of WO2024080278A1 publication Critical patent/WO2024080278A1/ja
Priority to US19/095,526 priority patent/US20250230007A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/0006—Article or web delivery apparatus incorporating cutting or line-perforating devices
    • B65H35/0073—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2220/00—Function indicators
    • B65H2220/01—Function indicators indicating an entity as a function of which control, adjustment or change is performed, i.e. input
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2220/00—Function indicators
    • B65H2220/02—Function indicators indicating an entity which is controlled, adjusted or changed by a control process, i.e. output
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/421—Forming a pile
    • B65H2301/4213—Forming a pile of a limited number of articles, e.g. buffering, forming bundles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5152—Cutting partially, e.g. perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/51—Cam mechanisms
    • B65H2403/514—Cam mechanisms involving eccentric
    • 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
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/514—Particular portion of element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/10—Mass, e.g. mass flow rate; Weight; Inertia
    • 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
    • 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
    • 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
    • B65H2801/24—Post -processing devices
    • B65H2801/27—Devices located downstream of office-type machines

Definitions

  • the present invention relates to a sheet stacking device that stacks sheets that have been processed to form perforations on conveyed sheets, and an image forming system and information processing device that are equipped with the sheet stacking device.
  • Patent Document 1 Conventionally, there have been known sheet processing devices that punch perforations in sheets discharged from an image forming device (see, for example, "Patent Document 1").
  • the sheet processing device described in Patent Document 1 transports the sheet on which perforations have been formed by the sheet processing device downstream and to a finisher.
  • finishers are provided with a loading tray for loading sheets (see, for example, "Patent Document 2"), and in the device described in Patent Document 1, perforated sheets are also loaded on this loading tray.
  • JP 2019-206420 A Japanese Patent No. 5825914
  • perforations in a sheet multiple tiny perforations or cuts are made at approximately linear intervals in a direction perpendicular to the sheet transport direction.
  • the perforated holes are not cut out, so burrs or other convex parts in the thickness direction of the sheet are formed around each hole that forms the perforations.
  • One aspect of the present invention is a sheet loading device that includes a transport section that transports sheets in a predetermined transport direction, a discharge section that discharges the sheets transported by the transport section, a loading section that stacks the sheets discharged by the discharge section, and a control section that stops the loading operation of sheets onto the loading section in response to the amount of sheets loaded onto the loading section, in which, when non-perforated sheets are loaded onto the loading section, the control section stops the loading operation of sheets onto the loading section in response to a first amount of sheets being loaded onto the loading section, and, when perforated sheets are loaded onto the loading section, the control section stops the loading operation of sheets onto the loading section in response to an amount of sheets less than the first amount being loaded onto the loading section.
  • One aspect of the present invention is an information processing device that includes a memory that stores a control program that controls the loading operation of sheets onto a loading device on which sheets that have been perforated by a perforation device and sheets that have been transported from the image forming device without being perforated by the perforation device are loaded, and a processor that executes the control program, and by executing the program, the processor stops the loading of sheets onto the loading device when sheets that have been perforated in a predetermined manner are loaded onto the loading device at a number of sheets that is less than the maximum number of sheets that can be loaded when a predetermined sheet that has not been perforated is loaded onto the loading section.
  • One aspect of the present invention is a sheet stacking device that stacks sheets sent from an upstream device in the sheet transport direction, comprising a transport section that transports the sheets sent from the upstream device, a discharge section that discharges the sheets transported by the transport section, a stacking section that stacks the sheets discharged by the discharge section, and a control section that acquires perforation presence/absence information of the sheets loaded on the stacking section from the upstream device and controls the discharge section to vary the maximum number of sheets that can be loaded on the stacking section, and when a specific sheet recognized as having a specific perforation is loaded on the stacking section, the control section controls the discharge section to stop the stacking of sheets on the stacking section at a number of sheets that is less than the maximum number of sheets that can be loaded on the stacking section when the specific sheet is recognized as not having a specific perforation.
  • the present invention makes it possible to improve the alignment of sheets loaded in a sheet loading device that loads sheets with perforations.
  • FIG. 1 is a cross-sectional view showing a configuration of a sheet processing apparatus and an image forming apparatus including a sheet stacking device according to the present invention
  • 1 is a block diagram illustrating a configuration of a control system of a sheet processing apparatus and an image forming apparatus including a sheet stacking device according to the present invention
  • FIG. 2 is a cross-sectional view illustrating a configuration of the sheet processing apparatus.
  • 2 is a block diagram showing a configuration of a control system of the sheet processing apparatus;
  • 2 is a side view of the sheet processing apparatus as viewed from the downstream side in the conveying direction.
  • FIG. 1 is a perspective view of a sheet on which processing (perforations) have been performed near the center position.
  • FIG. 1 is a perspective view of a sheet on which processing (perforations) has been performed near the upstream edge.
  • FIG. 1 is a perspective view of a sheet on which processing (perforations) has been applied near the center position and near the upstream edge.
  • FIG. 2 is a cross-sectional view showing a configuration of a finisher.
  • FIG. 2 is a block diagram showing the configuration of a control system of the finisher.
  • FIG. 13 is a diagram showing a screen for setting the type of perforation.
  • FIG. 13 is a diagram showing a screen for setting the position of a single perforation.
  • FIG. 13 is a diagram showing a screen for setting the position of a double perforation.
  • FIG. 11 is a cross-sectional view showing a state in which unperforated sheets are stacked on a stack tray of the finisher;
  • FIG. 11 is a cross-sectional view showing a state in which perforated thin paper is loaded on a loading tray of the finisher.
  • FIG. 11 is a cross-sectional view showing a state in which perforated thick paper is loaded on a loading tray of the finisher.
  • FIG. 13 is an explanatory diagram of the maximum number of sheets that can be loaded according to the perforation mode.
  • FIG. 13 is a flowchart showing the flow of a printing process.
  • 13 is a flowchart showing a process for determining an upper limit of the number of sheets that can be loaded;
  • the image forming system 1 has an image forming device 600, a sheet processing device 200 arranged adjacent to the side of the image forming device main body, and a finisher 100 as a sheet stacking device arranged adjacent to the sheet processing device on the side opposite the image forming device 600.
  • the image forming apparatus 600 has a document feeder 650 and an operation unit 601.
  • the document fed by the document feeder 650 is read, and an image is formed on the photosensitive drums 914a to 914d.
  • the position where the user faces the operation unit 601 to perform various inputs and settings on the image forming apparatus 600 is referred to as the front side of the image forming system 1 (hereinafter referred to as the "front side"), and the rear side of the apparatus is referred to as the rear side.
  • the four-color toner image of yellow, magenta, cyan, and black is transferred onto the sheet supplied from the sheet cassettes 909a and 909b in the image forming device 600 by the photosensitive drums 914a to 914d, which serve as image carriers.
  • the photosensitive drums 914a to 914d each constitute an image forming section that forms a toner image on the sheet.
  • the sheet is then transported to the fixing device 904 where the toner image is fixed, and in the case of a single-sided image forming mode, the sheet is directly discharged from the discharge rollers 907 to the outside of the image forming device 600. In the case of a double-sided image forming mode, the sheet is handed over from the fixing device 904 to the reversing rollers 905.
  • the reversing rollers 905 are rotated in the reverse direction.
  • the sheet is conveyed in the direction of the double-sided conveying rollers 906a to 906f, which is the opposite direction to the sheet conveying direction.
  • a four-color toner image is transferred again to the back side of the sheet by photosensitive drums 914a-914d of yellow, magenta, cyan, and black.
  • the sheet with the toner images transferred to both sides is transported again to the fixing device 904, where the toner images are fixed, and then the sheet is discharged outside the image forming device 600 by discharge rollers 907.
  • the sheet processing device 200 transports the sheet discharged from the discharge roller 907 of the image forming device 600 toward the finisher 100, and performs a perforation formation process on the sheet during the transport, which will be described later.
  • the finisher 100 accepts sheets discharged from the sheet processing device 200, which acts as a perforation processing device, and discharges them to the lower stacking tray 750 (or the upper stacking tray 751). However, based on user settings, it can also discharge the sheets to the lower stacking tray 750 after performing post-processing such as stapling or stacking.
  • Sheets discharged from the image forming apparatus 600 can be processed by the sheet processing apparatus 200 and finisher 100 connected online.
  • the image forming apparatus 600 can also be used alone without connecting the sheet processing apparatus 200 to the discharge port 9.
  • the image forming apparatus 600 may incorporate the sheet processing apparatus 200 and finisher 100 as a sheet discharge apparatus.
  • the image forming apparatus 600 is not limited to an image forming apparatus main body that performs the above-mentioned color image formation, but may also be a black and white image forming apparatus main body.
  • FIG. 2 is a block diagram showing the configuration of the control unit 4 that controls the image forming system 1.
  • the CPU (Central Processing Unit) circuit unit 630 has a CPU 629, a ROM (Read Only Memory) 631, and a RAM (Random-access Memory) 655.
  • the CPU circuit unit 630 controls the document feeder control unit 632, the image reader control unit 633, the image signal control unit 634, the printer control unit 635, the finisher control unit 636, the sheet processing control unit 638, and the external interface 637.
  • the CPU circuit unit 630 performs control according to the program stored in the ROM 631 and the settings of the operation unit 601.
  • the document feeder control unit 632 controls the document feeder 650.
  • the image reader control unit 633 controls the image reader 5.
  • the printer control unit 635 controls the image forming device 600.
  • the sheet processing control unit 638 controls the sheet processing device 200, which serves as a sheet processing unit that performs a predetermined processing on the sheet transported by the pair of transport rollers 211, which serves as the sheet transport unit shown in FIG. 3.
  • the finisher control unit 636 controls the finisher 100.
  • the sheet processing control unit 638 is installed in the sheet processing device 200, and the finisher control unit 636 is installed in the finisher 100.
  • the present invention is not limited to this, and the sheet processing control unit 638 and the finisher control unit 636 may be provided in the image forming apparatus 600 integrally with the CPU circuit unit 630, and the sheet processing device 200 and the finisher 100 may be controlled from the image forming apparatus 600 side.
  • the finisher control unit 636 communicates with the image forming apparatus 600 and acquires post-processing information input by the operator.
  • RAM 655 is used as an area for temporarily storing control data and as a working area for calculations associated with control.
  • External interface 637 is an interface from personal computer (PC) 620, and develops print data into an image and outputs it to image signal control unit 634.
  • An image read by image sensor 5a is output from image reader control unit 633 to image signal control unit 634.
  • the image output from image signal control unit 634 to printer control unit 635 is then input to an exposure control unit (not shown) that controls laser scanner 10, which serves as an image exposure unit.
  • the sheet processing control unit 638 is mounted on the sheet processing device 200, and controls the drive of the entire sheet processing device 200 by exchanging information with the CPU circuit unit 630 of the image forming system 1.
  • the finisher control unit 636 is mounted on the finisher 100, and controls the drive of the entire finisher 100 by exchanging information with the CPU circuit unit 630 of the image forming system 1.
  • the sheet processing control unit 638 and the finisher control unit 636 control various motors, sensors, etc. provided in the image forming system 1.
  • the sheet processing device 200 has a housing 271 supported by casters 270, and a sheet processing path 6 extending horizontally is arranged inside the housing 271.
  • a processing unit 8 is arranged in the middle of the sheet processing path 6, and the processing unit 8 has a sheet processing unit 220 that performs a perforation forming process to form perforations, and a lateral/skew registration correction unit (hereinafter referred to as a lateral registration skew correction unit) 250 arranged adjacent to the downstream side of the sheet processing unit 220.
  • a lateral/skew registration correction unit hereinafter referred to as a lateral registration skew correction unit
  • a plurality of conveying roller pairs 202, 208, 209, 210, and 211 are arranged along the sheet processing path 6 upstream of the sheet processing unit 220, and each conveying roller, for example, as shown by the conveying roller pair 211, is arranged such that a driving (active) roller 211a is arranged below the sheet processing path 6, and a driven roller 211b is arranged above so as to be in contact with the driving roller 211a.
  • the drive rollers of these transport rollers are driven by a motor M25.
  • the entrance of the sheet processing path 6 is aligned with the discharge outlet 9 of the image forming device 600, and an entrance sensor 201 is installed to detect the sheet received in the sheet processing path 6 from the discharge outlet 9, and a sheet end detection sensor 213 and a unit identification sensor 222 are arranged on the entrance side of the processing unit 8.
  • the sheet processing path 6 downstream of the lateral registration skew correction unit 250 also has multiple transport roller pairs 214, 215, 216, 206 arranged, and a discharge sensor 207 is arranged at the discharge outlet.
  • the discharge outlet of the sheet processing path 6 is aligned with the sheet path entrance of the finisher 100.
  • the drive rollers of these downstream transport roller pairs 214, 215, 216, 206 are driven by a motor M26.
  • the sheet processing unit 220 has a die plate 225, and shaft guides 228a, 228b are erected at the front and rear ends of the die plate 225, and the perforation forming blade 404 is supported by these shaft guides so that it can move freely in the vertical direction.
  • a pressure drive unit 280 is disposed above the sheet processing unit 220.
  • the pressure drive unit 280 has a cam drive motor M21 and an eccentric cam 282 driven by the cam drive motor M21.
  • the eccentric cam 282 rotates eccentrically by a cam shaft 281 to press the perforation forming blade 404.
  • various shapes can be adopted for the perforation forming blade, such as a rotating cutter configuration.
  • the sheet processing device 200 sequentially takes in the sheets discharged from the discharge port 9 of the image forming device 600.
  • the sheet processing in the sheet processing device 200 operates according to the user's settings via the operation unit 601 provided in the image forming device 600.
  • the sheet discharged from the discharge port 9 of the image forming device 600 is delivered to the conveying roller pair 202 of the sheet processing device 200.
  • the entrance sensor 201 also detects the timing of the sheet delivery at the same time.
  • the sheet is conveyed to the processing unit 8 by the conveying roller pairs 208 to 211. Then, it passes through the conveying path 232 of the sheet processing unit 220 shown in Figures 3 and 5.
  • perforations are multiple cut lines formed at intervals in a straight line from one end to the other end in the sheet width direction, or multiple small perforations in a row, and one perforation is defined as one formed by one operation of the perforation processing mechanism described below.
  • Figures 6A to 6C are perspective views of a sheet that has been processed (perforated) by the sheet processing unit.
  • Figure 6A shows a state in which perforations have been made in a mode (hereinafter referred to as "center perforations") that forms perforations in a direction perpendicular to the sheet transport direction (width direction) at approximately the center of the sheet (i.e., the center) in the sheet transport direction (length direction) indicated by arrow A.
  • center perforations a mode that forms perforations in a direction perpendicular to the sheet transport direction (width direction) at approximately the center of the sheet (i.e., the center) in the sheet transport direction (length direction) indicated by arrow A.
  • Figure 6B shows a state in which perforations have been made in a mode (hereinafter referred to as "single perforations") that forms perforations in a direction perpendicular to the sheet transport direction (width direction) near the upstream edge of the sheet in the transport direction (length direction) indicated by arrow A (upstream end, in this embodiment, 12 mm downstream from the upstream edge of the sheet).
  • single perforations a mode that forms perforations in a direction perpendicular to the sheet transport direction (width direction) near the upstream edge of the sheet in the transport direction (length direction) indicated by arrow A (upstream end, in this embodiment, 12 mm downstream from the upstream edge of the sheet).
  • 6C also shows the state in which perforations have been made in a mode (hereinafter referred to as "double perforation") that forms two perforations along the width of the sheet at two locations: approximately the center of the sheet's length along the sheet's conveying direction indicated by arrow A, and near the upstream edge (in this embodiment, this is a location 12 mm downstream from the upstream edge of the sheet).
  • double perforation a mode that forms two perforations along the width of the sheet at two locations: approximately the center of the sheet's length along the sheet's conveying direction indicated by arrow A, and near the upstream edge (in this embodiment, this is a location 12 mm downstream from the upstream edge of the sheet).
  • the sheet that has been perforated by the sheet processing unit 220 is again sandwiched and transported by the transport roller pair 211, and then transported by the transport roller pairs 214 to 216 and the transport roller pair 206 to be delivered to the downstream finisher 100.
  • a unit identification sensor 222 reads type information stored in the memory section of an IC (Integrated Circuit) chip 221, which serves as a memory section mounted on the sheet processing unit 220. This identifies which type of sheet processing unit 220 is mounted on the processing section 8.
  • IC Integrated Circuit
  • the sheet processing control unit 638 has a CPU (Central Processing Unit) 701 consisting of a microcomputer. It also has a RAM (Random Access Memory) 702 and a ROM (Read Only Memory) 703. It also has an I/O (Input/Output) 705, a communication interface 706, and a network interface 704, which are input/output units. Furthermore, a transport control unit 707 performs sheet transport processing. In addition, in the sheet processing drive control unit 708, the eccentric cam 282 is rotationally driven and controlled by a cam drive motor M21.
  • a cam drive motor M21 the eccentric cam 282 is rotationally driven and controlled by a cam drive motor M21.
  • the type of the installed sheet processing unit 220 is identified by reading type information stored in the memory unit of the IC chip 221, which is a memory unit incorporated in the sheet processing unit 220. Additionally, the lateral registration skew correction control unit 710 corrects the skew of the sheet.
  • FIG. 7 is a configuration diagram of the finisher 100 shown in FIG. 1.
  • the finisher 100 sequentially takes in sheets discharged from the sheet processing device 200, aligns the taken-in sheets into one bundle, and performs various sheet post-processing such as stapling the rear end of the bundled sheets.
  • the finisher 100 takes in the sheets delivered from the sheet processing device 200 into the conveying path 520 by the conveying roller pair 511.
  • the sheets taken in by the conveying roller pair 511 are conveyed via the conveying roller pairs 512, 513, and 514 as a conveying section.
  • conveying sensors 570, 571, 572, and 573 are provided, each of which detects the passage of a sheet.
  • the conveying roller pair 512 is provided in the shift unit 580 together with the conveying path sensor 571.
  • the shift unit 580 can move the sheet in the sheet width direction perpendicular to the conveying direction by the shift motor M11 described later. By driving the shift motor M11 while the conveying roller pair 512 is holding the sheet, the sheet can be offset in the sheet width direction while being conveyed.
  • the shift sort mode the position of the sheet stack is shifted in the width direction for each set.
  • the offset amount is 15 mm toward the front (front shift) or 15 mm toward the back (back shift) from the center position in the width direction.
  • the sheet is discharged to the same position as the front shift.
  • the finisher 100 detects that the sheet has passed through the shift unit 580 by the input of the conveying path sensor 571, it drives the shift motor M11 to return the shift unit 580 to the center position.
  • a switching flapper 540 that guides the sheet conveyed by the conveying roller pair 514 to the buffer path 523.
  • the switching flapper 540 is driven by a solenoid (not shown).
  • a buffer path roller pair 519 is arranged in the buffer path 523.
  • a switching flapper 541 that switches the conveying destination to either the upper discharge path 521 or the lower discharge path 522.
  • the switching flapper 541 switches to the upper discharge path 521 side, the sheet is guided to the upper discharge path 521 by the conveying roller pair 514 driven by the conveying motor M1.
  • the sheet is then discharged to the upper stack tray 751 by the upper discharge roller pair 515 as a discharge section driven by the discharge motor M2.
  • An upper tray discharge sensor 574 is provided on the upper discharge path 521 to detect the passage of the sheet.
  • the switching flapper 541 switches to the lower discharge path 522 side
  • the sheet is guided to the lower discharge path 522 by a pair of conveying rollers 514 driven by a conveying motor M1.
  • the sheet is then guided to the processing tray 530 by a first pair of lower conveying rollers 516, a second pair of lower conveying rollers 517, and a pair of processing tray conveying rollers 518, all of which are driven by a conveying motor M1.
  • a first conveying sensor 575 and a second conveying sensor 576 are provided on the lower discharge path 522 to detect the passage of the sheet.
  • the sheets guided to the processing tray 530 are discharged onto the processing tray 530 or onto the lower stack tray 750 by a pair of bundle discharge rollers 590 driven by a bundle discharge motor (not shown), depending on the post-processing mode.
  • a lower tray discharge sensor 577 is disposed on the processing tray 530 to detect the passage of the sheets.
  • a stapler unit 591 is also disposed on the processing tray 530, which staples the sheet bundle aligned on the processing tray 530.
  • the lower stacking tray 750 and the upper stacking tray 751 can be raised and lowered by the lower tray lifting motor M10 and the upper tray lifting motor M9 described below.
  • the lower tray paper surface detection sensor 720 and the upper tray paper surface detection sensor 721 detect the top surface of each stacking tray or the sheets on each stacking tray.
  • the finisher 100 drives the lower tray lifting motor M10 and the upper tray lifting motor M9 based on the detection results of the lower tray paper surface detection sensor 720 and the upper tray paper surface detection sensor 721, thereby controlling the distance between each stacking tray or the top surface of the sheets on each stacking tray and the sheet discharge outlet to be a constant distance at all times.
  • the upper tray paper presence detection sensor 730 and the lower tray paper presence detection sensor 731 detect the presence or absence of sheets on the lower stacking tray 750 and the upper stacking tray 751.
  • the finisher control unit 636 as a control unit is configured with a CPU 412, a RAM 414, a ROM 415, an input/output I/O 411, a communication interface (SCI) 413, etc.
  • the finisher control unit 636 communicates with the CPU circuit unit 630, exchanges data such as sending and receiving commands, job information, and sheet delivery notification, and executes various programs stored in the ROM 415 to drive and control the finisher 100.
  • the finisher control unit 636 can be said to be an information processing device equipped with the CPU 412 as a processor, and the RAM 414 and ROM 415 as memories, and the ROM 415, which is an example of a non-primary computer-readable recording medium, stores a control program that controls the sheet loading operation on the finisher 100 as a loading device on which sheets transported from the image forming device 600 are loaded without being perforated by the sheet processing device 200 as a perforation device.
  • the finisher control unit 636 is a control unit (perforation information acquisition unit 4123, basis weight information acquisition unit 4122) that receives post-processing information (e.g., information related to perforation formation processing, information related to basis weight) received by the image forming apparatus 600 from the operator from the CPU circuit unit 630.
  • the RAM 414 temporarily stores control data and is used as a working area for calculation processing associated with control.
  • the communication interface (SCI) 413 performs serial communication with the CPU circuit unit 630 of the image forming apparatus 600, and transmits operation instructions and control data.
  • the input/output I/O 411 transmits on/off signals from the CPU 412 to output devices such as motors, and transmits signals from input devices such as sensors to the CPU 412.
  • a conveying motor M1 and a paper discharge motor M2 are connected to the input/output I/O 411. Further connected to the I/O 411 are a lower tray alignment motor (front) M6, a lower tray alignment motor (rear) M7, a lower tray alignment plate lifting motor M8, an upper tray lifting motor M9, a lower tray lifting motor M10, and a shift motor M11. Also connected to the I/O 411 are an upper tray paper surface detection sensor 721, a lower tray paper surface detection sensor 720, an upper tray paper presence detection sensor 730, a lower tray paper presence detection sensor 731, an upper tray paper discharge sensor 574, and a lower tray paper discharge sensor 577.
  • the upper tray drive encoder 578 and the lower tray drive encoder 579 output pulses according to the movement of the lower stacking tray 750 and the upper stacking tray 751, which rise and fall in response to the sheet surface detection operation of the sheets on the lower stacking tray 750 and the upper stacking tray 751.
  • the CPU 412 can determine the amount of movement of the lower stacking tray 750 and the upper stacking tray 751 by counting the pulses output from the upper tray drive encoder 578 and the lower tray drive encoder 579.
  • FIGS. 9A to 9C are diagrams showing examples of operation screens that allow the user to set the type and position of perforations using the operation unit 601.
  • the user can select from multiple types of perforation processing, and the user can also adjust the position of the perforations within a specified range.
  • FIG. 9A shows an example of a screen for setting the type of perforation.
  • a perforation processing selection screen 300 displays a center perforation selection combo box 301, a single perforation selection combo box 302, a double perforation selection combo box 303, and a no perforation processing (bypass) selection combo box 304, which act as toggle switches. The user can select the type of perforation they wish to implement from these combo boxes.
  • the perforation processing selection screen 300 also displays a single perforation position adjustment button 305 and a double perforation position adjustment button 306. By pressing these buttons, the single perforation position adjustment screen 310 shown in FIG. 9B or the double perforation position adjustment screen 320 shown in FIG. 9C is displayed, making it possible to adjust the position of each perforation.
  • the perforation processing selection screen 300 also displays an OK button 307 and a Cancel button 308, but as these buttons are general user interfaces, a description of them will be omitted.
  • FIG. 9B is a diagram showing an example of a screen for adjusting the position at which the single perforation is applied.
  • the single perforation position adjustment screen 310 displays a single perforation X-position adjustment field 311, an OK button 307, and a cancel button 308.
  • the user can adjust the position at which the single perforation is applied within a specified range by inputting a numerical value into the single perforation X-position adjustment field 311 using a numerical value input button (not shown) of the operation unit 601.
  • FIG. 9C is a diagram showing an example of a screen for adjusting the position of the double perforation.
  • the double perforation position adjustment screen 320 displays a double perforation Y position adjustment field 321, a double perforation X position adjustment field 322, an OK button 307, and a cancel button 308.
  • the user can adjust the position of the double perforation within a specified range by inputting numerical values into the double perforation Y position adjustment field 321 and the double perforation X position adjustment field 322 using the numerical value input buttons (not shown) of the operation unit 601.
  • 10A to 10C are diagrams showing the state in which the finisher 100 has loaded sheets delivered from the sheet processing device 200 onto the upper stacking tray 751. As shown in FIG. 10A, even if multiple sheets that have not been perforated are stacked, the sheets are stacked flat, so the sheets loaded onto the upper stacking tray 751 are loaded approximately parallel to the sheet contact surface angle on the upper stacking tray 751.
  • the impact of the convex parts such as burrs and burrs caused by the perforation process on the stacked sheets is greater on sheets with a small weight per unit area and a weak stiffness (sheets with a basis weight of 100 g/ m2 or less, hereinafter referred to as "thin paper") than on sheets with a large weight per unit area and a strong stiffness (sheets with a basis weight of more than 100 g/ m2 , hereinafter referred to as "thick paper").
  • the thin paper Since there is no significant difference in the height of the convex parts such as burrs and burrs between thick paper and thin paper, the thin paper, which has a small thickness itself, has a high deformation rate, the burrs cannot be crushed because the sheet weight is light, and the stiffness of the sheet is weak (low rigidity). As a result, the thin paper will distort the stacked sheet bundle significantly even when the number of sheets loaded is smaller than that of thick paper.
  • Figure 10B shows the shape of a stack of already stacked sheets when 300 sheets of thin paper with a center perforation are continuously stacked on upper stacking tray 751
  • Figure 10C shows the shape of a stack of already stacked sheets when 300 sheets of thick paper with a center perforation are continuously stacked on upper stacking tray 751, but the stack in Figure 10B is more raised than the stack in Figure 10C, making the sheets more likely to fall.
  • the upper limit of the number of sheets that can be loaded on the lower stacking tray 750 or upper stacking tray 751 is usually set to the maximum number of sheets that can be loaded (maximum loading capacity) of the tray (4000 sheets in this embodiment).
  • the finisher control unit 636 outputs a signal to the image forming device 600 to notify the image forming device 600 that it is overloaded, which means that no more sheets can be loaded on the tray (hereinafter referred to as "full load state").
  • the image forming device 600 receives an overload notification from the finisher 100, it temporarily stops the printing process and operates to wait for the sheet stack to be removed from the lower stacking tray 750 or upper stacking tray 751.
  • the convex portion may rise, as described above, causing stacking problems or the subsequent sheets falling when the subsequent sheets are stacked.
  • the above-mentioned upper tray paper surface detection sensor 721 and lower tray paper surface detection sensor 720 detect the paper surface of each tray, and drive the tray lift motor to lower the tray so that the paper surface is at a certain height, and the tray may be in a fully loaded state when it reaches its lower limit.
  • the upper limit of the number of sheets that can be loaded is set to 4000 sheets (maximum number of sheets that can be loaded).
  • the perforation mode is center perforation, the vicinity of the center position of the sheet becomes raised compared to other parts due to the influence of burrs and burrs, so when subsequent sheets are loaded, there is a risk that the sheets will fall downstream in the conveying direction along the shape of the stack of stacked sheets.
  • the upper limit of the number of sheets that can be loaded is set to 300 sheets
  • thick paper which is less affected by burrs
  • the upper limit of the number of sheets that can be loaded is set to 1000 sheets.
  • the perforation mode is double perforation
  • the vicinity of the center position and the vicinity of the upstream edge of the sheet become raised compared to other parts. In this case, one part does not become extremely distorted, so the number of sheets that can be loaded is greater than with center perforation.
  • the upper limit of the number of sheets that can be loaded is set to 1500 sheets for thin paper and 3000 sheets for thick paper.
  • the vicinity of the upstream edge of the sheet is raised compared to other parts.
  • the lower stacking tray 750 and the upper stacking tray 751 have an inclination angle as shown in FIG. 7 and FIG. 10A-C, and if only the vicinity of the upstream edge of the sheet is raised, there is a lower possibility that the sheet will fall downstream in the transport direction compared to a center perforation or a double perforation. Therefore, here, the maximum number of sheets that can be loaded is set to 2000 sheets for thin paper and 3000 sheets for thick paper.
  • the finisher control unit 636 stops the loading operation of the sheet on the loading tray in response to a first amount (first loading upper limit number, for example, the above-mentioned 4000 sheets) of sheets being loaded on the loading tray.
  • the finisher control unit 636 stops the loading operation of the predetermined sheet on the loading tray in response to an amount less than the first amount (a number of sheets less than the first amount, for example, the above-mentioned 3000 sheets, 2000 sheets, 1500 sheets, 1000 sheets, 300 sheets) of the predetermined sheet being loaded on the loading tray.
  • the first amount a number of sheets less than the first amount, for example, the above-mentioned 3000 sheets, 2000 sheets, 1500 sheets, 1000 sheets, 300 sheets
  • the finisher 100 is a sheet stacking device that stacks sheets sent from an upstream device in the sheet transport direction (in this embodiment, the image forming device 600 or the sheet processing device 200), and includes a pair of transport rollers 512, 513, and 514 as a transport section that transports sheets sent from the upstream device, a pair of upper discharge rollers 515 as a discharge section that discharges sheets transported by the transport section, a stacking section that stacks sheets discharged by the discharge section, and a finisher control unit 636 as a control unit that obtains perforation presence/absence information of the sheets loaded on the stacking section from the upstream device and controls the discharge section so as to vary the maximum number of sheets that can be loaded on the stacking section.
  • the finisher control unit 636 controls the discharge section to stop the stacking of sheets on the stacking section at a number of sheets that is less than the maximum number of sheets that can be loaded on the stacking section.
  • the finisher control unit 636 stops the sheet loading operation onto the loading tray in response to a second amount (first maximum loading number, for example, 3,000 sheets of thick paper or 2,000 sheets of thin paper) less than the first amount of the specified sheet being loaded onto the loading tray.
  • first maximum loading number for example, 3,000 sheets of thick paper or 2,000 sheets of thin paper
  • a specified sheet sheet of a specified paper type, basis weight, and size, for example, plain paper, A3, basis weight 70 g/ m2
  • a second position for example, the center
  • the loading operation of the specified sheet on the loading tray is stopped in response to a third amount (third maximum loading number, for example, 1,000 sheets of thick paper, 300 sheets of thin paper) less than the second amount of the specified sheet being loaded on the loading tray.
  • third maximum loading number for example, 1,000 sheets of thick paper, 300 sheets of thin paper
  • the finisher control unit 636 acquires perforation position information of a specific sheet that has been perforated and is loaded on the loading device by the CPU 412.
  • the CPU 412 stops the loading of sheets on the loading means at a number of sheets that is less than the maximum number of sheets that can be loaded when the position where the specific sheet is perforated is near the rear end in the sheet transport direction.
  • the finisher control unit 636 stops the loading operation of sheets on the loading tray in response to a fourth amount (fourth loading upper limit number, e.g., 3000 sheets, 1000 sheets) less than the first amount being loaded on the loading tray.
  • a fourth amount fourth loading upper limit number, e.g., 3000 sheets, 1000 sheets
  • the finisher control unit 636 stops the loading operation of sheets on the loading tray in response to a fifth amount (fifth loading upper limit number, e.g., 2000 sheets, 1500 sheets, 300 sheets) less than the fourth amount being loaded on the loading tray.
  • a fifth amount e.g., 2000 sheets, 1500 sheets, 300 sheets
  • the finisher control unit 636 acquires basis weight information of the perforated sheets loaded on the loading tray by the CPU 412.
  • the CPU 412 stops the loading of sheets on the loading device at a number of sheets that is less than the maximum number of sheets that can be loaded on the loading device (specifically, the maximum number of sheets that can be loaded on the loading tray) when the basis weight of the sheets of the specified size is equal to or greater than the specified value.
  • the finisher control unit 636 changes the amount of sheets at which the loading operation of sheets onto the loading tray is stopped depending on the number of perforations on the sheets to be loaded onto the loading tray. For example, when comparing double perforations with center perforations, the maximum number of sheets that can be loaded is 3,000 sheets of thick paper and 1,500 sheets of thin paper for double perforations, while it is 1,000 sheets of thick paper and 300 sheets of thin paper for center perforations.
  • the finisher control unit 636 acquires information on the number of perforations of the perforated sheets that the CPU 412 loads on the loading device.
  • the CPU 412 stops the loading of sheets on the loading device at a number of sheets that is less than the maximum number of sheets that can be loaded when the specified sheet has multiple perforations.
  • a loading setting is provided that allows the user to select whether to prioritize the loading amount or loading accuracy of the sheets loaded on the lower loading tray 750 or the upper loading tray 751.
  • This setting can be set on the operation unit 601. That is, the finisher control unit 636 is configured to be able to execute a loading amount priority mode and a loading accuracy priority mode.
  • the upper limit of the number of sheets that can be loaded is set to 4,000 sheets (maximum number of sheets that can be loaded), regardless of whether there are perforations or not.
  • the loading accuracy priority mode first mode
  • the upper limit of the number of sheets that can be loaded is set according to the perforation mode and the basis weight of the sheets, as described above.
  • the maximum number of sheets that can be loaded described here is the maximum number of sheets that are assumed to be loaded on the lower loading tray 750 or upper loading tray 751 of the finisher 100 of this embodiment, and it is desirable to set an optimal maximum number of sheets depending on the shape and angle of the loading tray to be implemented.
  • a loading tray shape with an inclination angle that slopes downward toward the upstream side in the transport direction is described, but even if the tray shape is substantially horizontal without an inclination angle, the alignment of perforated sheets can be improved by implementing this invention.
  • the printing process is realized in the image forming apparatus 600 by the CPU 629 of the CPU circuit unit 630 reading out a program stored in ROM 631 to RAM 655 as necessary and executing it, in the sheet processing apparatus 200 by the CPU 701 of the sheet processing control unit 638 reading out a program stored in ROM 702 to RAM 703 as necessary and executing it, and further in the finisher 100 by the CPU 412 of the finisher control unit 636 reading out a program stored in ROM 415 to RAM 414 as necessary and executing it.
  • step S101 when a print process (job) is started, the CPU 629 of the image forming device 600 receives the submitted print job (step S101).
  • the CPU 629 of the image forming device 600 feeds a sheet corresponding to the received print job information from the sheet cassettes 909a, 909b to an image forming unit (not shown), forms an image on the sheet by the image forming unit (step S102), and ejects the sheet with the image formed to the sheet processing device 200.
  • the CPU 701 of the sheet processing apparatus 200 recognizes from the print job information whether the received sheet is a sheet to be subjected to perforation formation processing (step S103).
  • step S103 determines that the delivered sheet is not a sheet to be subjected to perforation processing (step S103: NO)
  • the CPU 701 of the sheet processing device 200 discharges the sheet to the finisher 100 without performing perforation processing.
  • step S103 determines that the delivered sheet is a sheet to be perforated (step S103: YES)
  • the CPU 701 of the sheet processing device 200 performs perforation processing (step S104) and ejects the sheet to the finisher 100.
  • the CPU 412 of the finisher control unit 636 acquires the input print job information (step S105), and determines the maximum number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 based on the acquired information (step S106). The method for determining this maximum number of sheets will be described in detail later.
  • the CPU 412 determines whether the tray to which the delivered sheet is to be discharged is the upper stacking tray 751 or the lower stacking tray 750 (step S107).
  • step S107 If it is determined in step S107 that the destination tray is the upper stack tray 751 (step S107: YES), the CPU 412 transports the sheet along the upper discharge path 521 and then discharges the sheet onto the upper stack tray 751 (step S108).
  • step S107 if it is determined in step S107 that the destination tray is the lower stack tray 750 (step S107: NO), the CPU 412 transports the sheet along the lower discharge path 522 and discharges it directly onto the lower stack tray 750 (step S109).
  • the CPU 412 increments the counter for the number of sheets loaded on each tray (step S110).
  • the loaded sheet counter to be incremented may be a total sheet counter that counts the total number of sheets loaded on the lower stacking tray 750 or the upper stacking tray 751, or a perforation sheet counter that counts only the number of sheets that have been perforated, or both counters may be provided and counted.
  • the CPU 412 determines whether the stack number counter has reached the stack upper limit determined in step S106 (step S111).
  • step S111 If it is determined in step S111 that the number of sheets stacked on the lower stacking tray 750 or the upper stacking tray 751 has reached the upper stacking limit (step S111: YES), the CPU 412 notifies the image forming apparatus 600 that the lower stacking tray 750 or the upper stacking tray 751 of the finisher 100 is overloaded (step S112).
  • image forming device 600 continues operation from the time it receives notification that the number of sheets loaded has been exceeded until it has loaded the fed sheets onto the loading tray, and then temporarily halts image formation processing.
  • CPU 412 recognizes that paper presence/absence detection sensor 730 or 731 is OFF, it cancels the full load state.
  • step S111 determines whether the number of sheets stacked on the lower stacking tray 750 or the upper stacking tray 751 has not yet reached the upper stacking limit. If it is determined in step S111 that the number of sheets stacked on the lower stacking tray 750 or the upper stacking tray 751 has not yet reached the upper stacking limit (step S111: NO), the CPU 412 proceeds to step S113 without notifying the image forming apparatus 600 that the lower stacking tray 750 or the upper stacking tray 751 of the finisher 100 has exceeded its stacking limit.
  • the CPU 412 determines whether the job for all pages has been completed (step S113). If it is determined in step S113 that the job for all pages has not been completed (step S113: NO), the CPU 412 returns to step S102 and continues processing in order to process the next job.
  • step S113 if it is determined in step S113 that the job for all pages has been completed (step S113: YES), the printing process ends.
  • overloading i.e., whether the number of sheets loaded on the loading tray exceeds the upper limit, is determined based on the count value of the loaded sheet counter 4121, which counts the number of sheets discharged to the loading tray, but it may also be determined based on, for example, the number of sheets output counted by a counter in the CPU circuit unit 630 of the image forming apparatus 600 or the number of sheets received counted by a receiving counter in the finisher control unit 636.
  • height information of the lower loading tray 750 or the upper loading tray 751 may be used to control the system to notify of overloading if the height is above a certain reference height, or a sensor may be provided to detect the height of the sheets loaded on the lower loading tray 750 or the upper loading tray 751, and whether the upper limit is exceeded may be determined based on the detection result of the sensor. That is, the finisher control section 636 is configured to stop the sheet stacking operation on the stacking tray 750/751 depending on the amount of sheets stacked on the stacking tray 750/751 as a stacking section. The amount of sheets stacked on the stacking tray 750/751 may be detected based on the count values counted by the various counters as described above or the output values of various sensors.
  • the number of perforated sheets to be loaded is known in advance when the image forming device 600 accepts a job, if the number of sheets to be loaded is equal to or exceeds the upper limit, for example, a message may be displayed on the operation unit 601 or the display of the personal computer 620 indicating that the loading of sheets will be temporarily stopped when the upper limit is reached, or the sheets exceeding the upper limit may be loaded onto a separate loading tray.
  • step S103 it is determined whether or not to perform perforation formation processing, but it is also possible to make this determination by having the perforation information acquisition unit 4123 obtain information from the image forming device 600 that the sheets fed to the image forming device 600 are perforated from the beginning (hereinafter referred to as pre-perforated sheets).
  • pre-perforated sheets the sheets fed to the image forming device 600 are perforated from the beginning.
  • FIG. 13 is a flowchart showing the process for determining the maximum number of sheets that can be loaded from the acquired job information. This flowchart is executed by the CPU 412 of the finisher control unit 636.
  • the CPU 412 first determines whether the loading accuracy priority mode has been selected in the loading settings of the finisher 100 (step S201).
  • step S201 If it is determined in step S201 that the loading accuracy priority mode has not been selected (step S201: NO), the CPU 412 sets the maximum number of sheets that can be loaded to F (step S216). Since there is no restriction on the maximum number of sheets that can be loaded, the maximum number of sheets that can be loaded in the finisher 100 is F.
  • step S201 determines from the acquired job information whether or not the sheets to be stacked have been perforated (step S202).
  • step S202 If it is determined in step S202 that the sheets have not been perforated (step S202: NO), the CPU 412 sets the maximum number of sheets that can be loaded to F (step S216).
  • the maximum number of sheets that can be loaded when the sheets have not been perforated is set to F, but this may be set arbitrarily depending on processing other than perforation, sheet basis weight information, etc.
  • step S202 If it is determined in step S202 that the sheets have been perforated (step S202: YES), the CPU 412 determines from the acquired job information whether the perforation mode applied to the sheets to be loaded is center perforation (step S203).
  • step S203 determines whether the basis weight of the sheets to be stacked is less than a predetermined amount (step S204). This is because, as described above, thin paper is more susceptible to the effects of burrs and burrs in the perforations, and the stack of sheets that has already been stacked will be significantly distorted.
  • step S204 If it is determined in step S204 that the basis weight of the sheets to be loaded is less than the predetermined amount (step S204: YES), the CPU 412 sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to A (step S205).
  • step S204 determines that the basis weight of the sheets to be loaded is equal to or greater than the predetermined amount (step S204: NO)
  • the CPU 412 sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to B (step S206).
  • step S203 If it is determined in step S203 that the perforation mode is not center perforation (step S203: NO), the CPU 412 further determines whether the perforation mode is single perforation (step S207).
  • step S207 If it is determined in step S207 that the perforation mode is single perforation (step S207: YES), the CPU 412 determines whether the basis weight of the sheets to be loaded is less than a predetermined amount (step S208).
  • step S208 If it is determined in step S208 that the basis weight of the sheets to be loaded is less than the predetermined amount (step S208: YES), the CPU 412 sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to D. (step S209)
  • step S208 determines that the basis weight of the sheets to be loaded is equal to or greater than the predetermined amount. If it is determined that the basis weight of the sheets to be loaded is equal to or greater than the predetermined amount (step S208: NO), the CPU 412 sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to E (step S210).
  • step S207 determines whether the perforation mode is double perforation (step S211).
  • step S211 determines whether the basis weight of the sheets to be loaded is less than a predetermined amount (step S212).
  • step S212 If it is determined in step S212 that the basis weight of the sheets to be loaded is less than the predetermined amount (step S212: YES), the CPU 412 sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to C (step S213).
  • step S212 determines that the basis weight of the sheets to be loaded is equal to or greater than the predetermined amount (step S212: NO)
  • the CPU 412 sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to E (step S214).
  • step S211 determines that the perforation mode is other than the specified mode, and sets the upper limit number of sheets that can be loaded on the lower stacking tray 750 or the upper stacking tray 751 to E (step S215).
  • Modes other than the specified include, for example, modes in which perforations are formed in the sheet transport direction, and modes in which perforation processing is performed on only a portion of the sheet. In such cases, too, it is possible to set the maximum number of sheets that can be loaded arbitrarily depending on the loading capacity. On the other hand, in cases where perforation processing is performed on only a small portion of the sheet, for example only on a portion of the sheet corner, there is no significant change in height, so the maximum number of sheets that can be loaded does not need to be changed.
  • control program can be realized in various ways, such as by loading it from an external server or online from the cloud, or by loading it from a personal computer used to operate the image forming system and executing it.
  • the maximum number of sheets that can be stacked on the stacking tray is set to an optimal number according to the mode of the perforations on the sheets and the basis weight of the sheets, and by limiting the number of sheets that can be stacked on the stacking tray, it is possible to prevent stacking errors and subsequent sheets from falling off the tray even when stacking sheets with perforations.
  • the present invention can be used in a sheet stacking device for stacking sheets.
  • Image forming system image forming apparatus
  • 100 Sheet stacking device
  • 200 Perforation processing device / 512, 513, 514: Conveying section (pair of conveying rollers) / 515: Discharge section (pair of upper discharge rollers)
  • 600 Image forming apparatus (main body of image forming apparatus)
  • 636 Control section (finisher control section) / 751: Stacking section (upper stacking tray)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pile Receivers (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
PCT/JP2023/036751 2022-10-11 2023-10-10 シート積載装置、画像形成システム及び情報処理装置 Ceased WO2024080278A1 (ja)

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EP23877281.8A EP4603437A1 (en) 2022-10-11 2023-10-10 Sheet stacking device, image forming system, and information processing device
US19/095,526 US20250230007A1 (en) 2022-10-11 2025-03-31 Sheet stacking apparatus, image forming system, and information processing apparatus

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2009249080A (ja) * 2008-04-02 2009-10-29 Konica Minolta Business Technologies Inc シート積載装置
JP2012066929A (ja) * 2010-09-27 2012-04-05 Canon Inc プリンタ装置、プリンタ装置の制御方法、プログラム、及び記憶媒体
JP5825914B2 (ja) 2011-08-05 2015-12-02 キヤノン株式会社 シート積載装置
JP2019206420A (ja) 2018-05-29 2019-12-05 キヤノンファインテックニスカ株式会社 紙類処理装置及び画像形成装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009249080A (ja) * 2008-04-02 2009-10-29 Konica Minolta Business Technologies Inc シート積載装置
JP2012066929A (ja) * 2010-09-27 2012-04-05 Canon Inc プリンタ装置、プリンタ装置の制御方法、プログラム、及び記憶媒体
JP5825914B2 (ja) 2011-08-05 2015-12-02 キヤノン株式会社 シート積載装置
JP2019206420A (ja) 2018-05-29 2019-12-05 キヤノンファインテックニスカ株式会社 紙類処理装置及び画像形成装置

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