US20140312559A1 - Sheet stacking apparatus and image forming apparatus - Google Patents

Sheet stacking apparatus and image forming apparatus Download PDF

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Publication number
US20140312559A1
US20140312559A1 US14/249,625 US201414249625A US2014312559A1 US 20140312559 A1 US20140312559 A1 US 20140312559A1 US 201414249625 A US201414249625 A US 201414249625A US 2014312559 A1 US2014312559 A1 US 2014312559A1
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US
United States
Prior art keywords
sheet
sheet stacking
stacked
cover portion
image forming
Prior art date
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Abandoned
Application number
US14/249,625
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English (en)
Inventor
Yasumasa Kidoh
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: KIDO, YASUMASA
Publication of US20140312559A1 publication Critical patent/US20140312559A1/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
    • B65H31/00—Pile receivers
    • B65H31/04—Pile receivers with movable end support arranged to recede as pile accumulates
    • B65H31/08—Pile receivers with movable end support arranged to recede as pile accumulates the articles being piled one above another
    • B65H31/10—Pile receivers with movable end support arranged to recede as pile accumulates the articles being piled one above another and applied at the top of the 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
    • B65H31/00—Pile receivers
    • B65H31/26—Auxiliary devices for retaining articles in the 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
    • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6552—Means for discharging uncollated sheet copy material, e.g. discharging rollers, exit trays
    • 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
    • B65H2301/514—Modifying physical properties
    • B65H2301/5144—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/115—Cover
    • 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
    • B65H2511/20—Location in space
    • 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
    • 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
    • B65H2511/515—Absence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/21—Dynamic air effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/21—Dynamic air effects
    • B65H2601/212—Environmental change in the area confining the handled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/30—Facilitating or easing
    • B65H2601/32—Facilitating or easing entities relating to handling machine
    • B65H2601/325—Manual handling of handled material
    • 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 a sheet discharged from a sheet discharge port, and also relates to an image forming apparatus provided with the sheet stacking apparatus.
  • an image forming apparatus such as a copying machine, a printer and a facsimile machine is equipped with a sheet stacking apparatus for stacking and receiving a sheet discharged from an image forming apparatus.
  • the sheet stacked on a sheet stacking tray of the sheet stacking apparatus is kept on the tray until a user takes it out.
  • an image forming apparatus may be situated near the windows, and the electric fan may be put near the image forming apparatus.
  • the wind entering the offices from the open windows or the wind generated by the electric fan may blow off sheets stacked on the tray, or disturb the lined-up arrangement of the sheet bundle.
  • the wind may disturb the sheets that are being discharged, and/or the sheets on the tray.
  • the order of the sheets discharged may be different from the order of the sheets stacked on the tray.
  • the image forming apparatus may be installed outside an office building.
  • one of the major installation places is a street, and a street stall has an image forming apparatus located inside the street stall.
  • This is a copy-taking shop on the street.
  • the sheet(s) on the tray may fly with the wind, and further drop on the street. Then, the sheet(s) will become unclean.
  • a certain type of sheet such as a sheet having a small bias weight or thin paper is easily influenced by the wind. If the image forming apparatus is placed near an air blowing outlet of an air conditioner in a room, a lined-up arrangement of stacked thin sheets on the tray may be disturbed by the air blowing from the air conditioner.
  • Japanese Patent Laid-Open No. 2003-2513 proposed one technique.
  • Japanese Patent Laid-Open No. 2003-2513 uses a press-down member that pushes the discharged sheet onto the upper face of the tray and causes the sheet to abut onto an apparatus main unit wall to achieve the lining up of the sheets.
  • the conventional image forming apparatus is not supposed to be used in a wind-blowing environment, such as where the wind blows around the image forming apparatus.
  • the conventional image forming apparatus does not have a function to protect the sheet(s) stacked on the sheet stacking apparatus from the wind.
  • the present invention provides a sheet stacking apparatus that can prevent the blowing off of the sheet while the sheet is being discharged, can prevent the blowing off of the stacked sheet(s), can prevent the disturbing of the lined-up arrangement of the stacked sheets, and can prevent the order of sheets discharged from being different from the order of sheets stacked due to the wind.
  • a sheet stacking apparatus of the present invention includes: a sheet stacking apparatus comprising: a sheet stacking portion on which a sheet discharged from a sheet discharge port is stacked; a cover portion disposed above the sheet stacking portion and having a facing surface facing a sheet stacking surface of the sheet stacking portion; a driving portion configured to lift and lower the sheet stacking portion; and a controller configured to control the driving portion such that, when a sheet is not stacked on the sheet stacking portion, a distance between the facing surface of the cover portion and the sheet stacking surface of the sheet stacking portion is kept within a predetermined range, and when a sheet is stacked on the sheet stacking portion, a distance between the facing surface of the cover portion and an uppermost surface of the sheet stacked on the sheet stacking portion is kept within the predetermined range.
  • FIG. 1 is a schematic cross-sectional view showing a general structure of an image forming apparatus equipped with a sheet stacking apparatus.
  • FIG. 2 is a cross-sectional view of major components of the sheet stacking apparatus of the image forming apparatus.
  • FIG. 3 shows a control block diagram of the sheet stacking apparatus.
  • FIG. 4 is a cross-sectional view of major components of the sheet stacking apparatus when the wind blows against a discharge tray.
  • FIG. 5 is a cross-sectional view of major components of the sheet stacking apparatus when an upper cover is opened.
  • FIG. 6 is a perspective view of major components of the sheet stacking apparatus.
  • FIG. 7 is a flowchart showing the control for lifting and lowering the discharge tray.
  • FIG. 8 is a cross-sectional view of major components of the sheet stacking apparatus immediately after the sheet is discharged.
  • FIG. 9 is a cross-sectional view of major components of the sheet stacking apparatus when the discharge tray is lowered.
  • FIG. 10 illustrates a discharged sheet that is stacked on an uppermost face of a sheet bundle.
  • FIG. 11 is a cross-sectional view of major components of the sheet stacking apparatus immediately after the sheet is removed.
  • FIG. 12 is a perspective view of major components of the sheet stacking apparatus that has ventilation holes in the upper cover.
  • FIG. 1 is a schematic cross-sectional view showing a general structure of the image forming apparatus.
  • the image forming apparatus 100 is a monochromatic high-speed printer that transfers a toner image formed on a photosensitive drum 101 onto a sheet P carried on a transfer belt 105 a.
  • the photosensitive drum 101 which is one example of an image bearing member, there are disposed a corona charger 102 , an exposing device 103 , a development device 104 , a transfer unit 105 , and a drum cleaning device 106 .
  • the photosensitive drum 101 has a photosensitive layer on an outer circumferential face of an aluminum cylinder, and rotates at a predetermined process speed in the direction of the arrow R 1 .
  • the corona charger 102 irradiates the photosensitive drum with a charged particle, which is generated upon corona discharge, such that the surface of the photosensitive drum 101 is uniformly charged with negative-polarity potential.
  • the exposing device 103 scans a laser beam, which is prepared by ON-OFF modulating scanning line image data, with a rotating mirror.
  • the scanning line image data is derived from an input image (prepared by developing).
  • the exposing device 103 writes an electrostatic image on the surface of the charged photosensitive drum 101 .
  • the development device 104 develops the electrostatic image formed on the photosensitive drum 101 to a toner image.
  • the transfer unit 105 forms a transfer portion T 1 between the photosensitive drum 101 and a transfer belt 105 a .
  • the toner image formed on the photosensitive drum 101 is transferred onto the sheet P carried on the transfer belt 105 a.
  • the sheets P stored in a recording material cassette 110 are conveyed, sheet by sheet, to resist rollers 120 by separation roller 111 .
  • the resist rollers 120 receive the sheet P and hold it at the deactivated state, and feeds the sheet P to the transfer portion T 1 in synchronization with the preparation timing of the toner image on the photosensitive drum 101 .
  • the drum cleaning device 106 causes a cleaning blade to slidably contact the photosensitive drum 101 , and recovers the residual toner remaining on the photosensitive drum, which are not transferred to the sheet P.
  • the toner image carried (born) on the photosensitive drum 101 is born by the transfer belt 105 a and transferred to the sheet P that passes through the transfer portion T 1 .
  • the sheet P, on which the toner image is transferred, is self-stripped from the transfer belt 105 a and conveyed to a fixing device 107 .
  • the sheet P is thermally pressed by the fixing device 107 , and the toner image is heat-fixed on the surface of the sheet.
  • the sheet P is discharged to the sheet stacking tray 300 of the sheet stacking apparatus from the apparatus main unit housing 100 K by the discharge rollers 113 .
  • the image forming apparatus 100 has a duplex image-forming function (both sides image-forming function).
  • the fixing device 107 finishes the fixing operation to the first side of the sheet P and then conveys the sheet P to the image forming portion again through a reversed convey path 114 .
  • a toner image is formed on the second side of the sheet P, which is re-fed to the image forming portion, by the same image forming process as described above.
  • FIG. 2 is a cross-sectional view of major components showing a general structure of the sheet stacking apparatus in the image forming apparatus.
  • the posture of the sheet stacking tray 300 has different vertical heights with respect to the sheet conveying direction (sheet discharging direction).
  • the height of the sheet stacking tray 300 measured in the gravity direction, at an upstream position in the sheet conveying direction is different from the height of the sheet stacking tray 300 at a downstream position.
  • the sheets are collected at the stopper and properly stacked in order.
  • the sheet stacking tray 300 takes a posture, with its upstream side in the sheet discharging direction being lower than its downstream side.
  • the discharged sheets P are collected on the side of the apparatus main unit wall 115 that has the sheet discharge port 117 .
  • an upper cover 301 which is a cover portion, having a facing plane (a facing surface) facing the sheet stacking surface of the sheet stacking tray 300 . That face of the upper cover 301 which faces the sheet stacking tray (facing plane) serves as a guide plane for guiding the sheet such that paper jamming does not occur and the sheet is not damaged even if the sheet discharged from the sheet discharge port 117 contacts the upper cover.
  • the sheet stacking tray 300 is equipped with a lower detection sensor 307 and a lower light-shielding plate 307 a .
  • the lower detection sensor 307 has a photo-interrupter and detects presence/absence of the sheet(s) stacked on the sheet stacking tray 300 .
  • the lower light-shielding plate 307 a rotates as it is pushed by the stacked sheet(s). Then, the lower light-shielding plate 307 a shields the light between the light-emitting portion and the light-receiving portion of the lower detection sensor 307 .
  • the lower detection sensor (first detection sensor) 307 When the lower light-shielding plate 307 a shields the light between the light emitting portion and the light receiving portion of the lower detection sensor 307 , the lower detection sensor (first detection sensor) 307 generates a detection signal indicating the presence of the sheet.
  • the upper cover 301 In order to detect the height of the sheet stacking surface of the sheet stacking tray 300 or the uppermost face of the sheet(s) stacked on the sheet stacking tray 300 , the upper cover 301 is equipped with an upper detection sensor 302 that has a photo-interrupter. The upper cover 301 is also equipped with an upper light-shielding plate 302 a .
  • the upper light-shielding plate 302 a abuts onto the sheet stacking surface of the sheet stacking tray 300 or the uppermost face of the sheet(s) stacked on the sheet stacking tray 300 .
  • the upper light-shielding plates shields the light between the light emitting portion and the light receiving portion of the upper detection sensor 302 , and causes the upper detection sensor (second detection sensor) 302 to alter its output signal.
  • the lower detection sensor 307 and the upper detection sensor 302 are connected to a controlling portion (controller) 305 provided in the image forming apparatus.
  • the sheet stacking tray 300 is equipped with a driving unit (driving portion) 306 , including gears, a motor M and other components, for lifting and lowering the sheet stacking tray 300 in the height direction of sheet stacking.
  • the controlling portion 305 controls the driving unit 306 based on the detection signals from the lower detection sensor 307 and upper detection sensor 302 .
  • the controlling portion 305 controls the driving unit 306 such that the distance between the sheet stacking surface of the sheet stacking tray 300 and the guide plane of the upper cover 301 is maintained at the predetermined gap A ( FIG. 2 ).
  • the predetermined gap A is 5 mm. Because the gap A is such small gap, the air resistance between the upper cover 301 and the sheet stacking tray 300 is large and the pressure loss is large when the wind blows against the sheet stacking tray. Therefore, the wind does not enter the gap between the upper cover 301 and the sheet stacking tray 300 , and flows to the less-resistant areas, i.e., around the sheet stacking tray 300 and the upper cover 301 ( FIG. 4 ).
  • the positional relationship between the sheet stacking surface of the sheet stacking tray 300 and the guide face of the upper cover 301 is not necessarily in parallel to each other ( FIG. 2 ).
  • the wind blowing toward the tray entered the gap between the upper cover 301 and the sheet stacking tray 300 and the stacked sheets were disturbed when the gap A was 7 mm.
  • the gap A was reduced to 6 mm and the wind blew toward the tray, an amount of wind entering the gap between the upper cover and the sheet stacking tray decreased, but the stacked sheets were sometimes disturbed.
  • the gap A was reduced to 5 mm or less and the wind blew toward the tray, the wind did not enter the gap between the upper cover and the sheet stacking tray, and the stacked sheets were never disturbed by the wind.
  • the gap A is preferably equal to or smaller than 5 mm. It should be noted that if the gap A is equal to or smaller than 3 mm, the jamming may occur when the sheet is discharged to the sheet stacking tray 300 .
  • the minimum gap between the sheet stacking surface of the sheet stacking tray 300 and the guide face of the upper cover 301 is set to a value that can ensure satisfactory discharging of the sheets. As such, the gap A can take an appropriate value in a predetermined range, and is not limited to the above-mentioned exemplary value(s).
  • the upper cover 301 is attached to the apparatus main unit housing 100 K and pivotable (openable and closable) relative to the apparatus main unit housing 100 K such that the upper cover 301 opens upward with respect to the sheet stacking tray 300 .
  • the upper cover 301 can move to the closed position ( FIG. 4 ) and the open position ( FIG. 5 ). At the closed position, that face of the upper cover 301 which is designed to face the sheet stacking surface of the sheet stacking tray 300 extends over the sheet stacking surface of the sheet stacking tray 300 .
  • the upper cover 301 allows the picking up (taking out) of the sheet P (or sheet bundle) stacked on the sheet stacking tray 300 .
  • stopper 308 provided at both ends of the upper cover 301 abut onto the apparatus main unit wall 115 and regulates the position of the upper cover 301 .
  • the gap B between the upstream end 303 of the upper cover 301 in the sheet discharging direction and the apparatus main unit wall 115 , as shown in FIG. 2 is set to be equal to or smaller than a predetermined value. If the gap B is greater than the predetermined value and the wind blows in a certain direction, the front end of the sheet P discharged from the sheet discharge port 117 may take an awkward behavior before the sheet front end reaches the upper cover 301 , and the sheet may be discharged between the upper cover 301 and the sheet discharge port 117 .
  • the gap B when the gap B is greater than the predetermined value, the rear end of the sheet P stacked on the sheet stacking tray 300 may be rolled up by the wind, and therefore the front end of a next discharged sheet P may slip under the rear end of the rolled up sheet P.
  • the gap B was set to 10 mm in this embodiment regardless of the sheet size.
  • the detection signal of the lower detection sensor 307 becomes OFF from ON (S 102 ).
  • the ON state is shown in FIG. 2 .
  • the detection signal of the upper detection sensor 302 becomes OFF (YES at S 103 ).
  • the controlling portion 305 controls the driving portion 306 to cause the sheet stacking tray 300 to lower (S 104 ).
  • the sheet stacking tray 300 starts lowering in the arrow D direction and arrives at a position that causes the detection signal of the upper detection sensor 302 to become ON (S 105 ), i.e., the position of the gap A, then the controlling portion 305 controls the driving portion 306 to stop the lowering of the sheet stacking tray 300 (S 106 ; FIG. 9 ).
  • the gap A between the sheet stacking surface of the sheet stacking tray 300 and the facing plane of the upper cover 301 is maintained in the predetermined range, and therefore the next discharged sheet P does not push out the sheets P′ already stacked on the sheet stacking tray 300 and is stacked on the sheets P′ ( FIG. 10 ).
  • the detection signal of the lower detection sensor 307 becomes ON (S 108 ), and the controlling portion 305 controls the driving portion 306 to cause the sheet stacking tray 300 to lift in the arrow U direction (S 109 ; FIG. 11 ).
  • the detection signal of the upper detection sensor 302 is turned to OFF by the sheet stacking surface of the sheet stacking tray 300 ( 5110 )
  • the controlling portion 305 controls the driving portion 306 to cause the elevated sheet stacking tray 300 to lower in the arrow D direction (S 111 ).
  • the controlling portion 305 controls the driving portion 306 again to stop the lowering of the sheet stacking tray 300 (S 113 ). As a result, the sheet stacking tray 300 is brought to the initial position (stand-by position).
  • the gap A between the sheet stacking surface of the sheet stacking tray 300 and the facing plane of the upper cover 301 is maintained in the predetermined range when no sheet is stacked on the sheet stacking tray 300 .
  • the gap A between the uppermost face of the sheet(s) stacked on the sheet stacking tray 300 and the facing plane of the upper cover 301 is maintained in the predetermined range.
  • the gap B between the upstream end 303 of the upper cover 301 in the sheet discharging direction and the apparatus main unit wall 115 which has the sheet discharge port 117 is equal to or smaller than the predetermined value, it is possible prevent the blowing off of the sheet(s) being discharged from the sheet discharge port by the wind and the blowing off of the sheet(s) stacked on the sheet stacking tray by the wind.
  • a ventilation hole (or holes) 304 may be formed in the upper cover 301 for upwardly ventilating the heat generated from the sheet(s) as long as the ventilation holes 304 do not decrease the above-described air resistance ( FIG. 12 ).
  • the upper cover 301 has one or more ventilation holes 304 that penetrate the upper cover from the facing plane in the gravity direction. Open side gaps between the sheet stacking tray 300 and the upper cover 301 are also used for ventilation.
  • the image forming apparatus is a copying machine in the above-described embodiment, the present invention is not limited in this regard.
  • the image forming apparatus may be other types of image forming apparatus such as a printer and a facsimile machine, or yet other types of image forming apparatus such as a multi-function printer that has the combined functions of the printer and facsimile machine.
  • the sheet stacking apparatus is integral with the image forming apparatus in the above-described embodiment, the present invention is not limited in this regard.
  • the sheet stacking apparatus may be removable from and attachable to the image forming apparatus.
  • the sheet stacking apparatus is used for the image forming apparatus in the above-described embodiment, the present invention is not limited in this regard.
  • the sheet stacking apparatus of the present invention may be used for a sheet processing apparatus, such as a finisher, that can selectively perform the aligning (lining up) process to the sheets and the stapling (or binding, filing) process to the sheets.
  • a sheet processing apparatus such as a finisher

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pile Receivers (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
US14/249,625 2013-04-23 2014-04-10 Sheet stacking apparatus and image forming apparatus Abandoned US20140312559A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-090539 2013-04-23
JP2013090539A JP2014213978A (ja) 2013-04-23 2013-04-23 シート積載装置及び画像形成装置

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US20140312559A1 true US20140312559A1 (en) 2014-10-23

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US (1) US20140312559A1 (zh)
JP (1) JP2014213978A (zh)
CN (1) CN104118756A (zh)

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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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