US20090212485A1 - Sheet collecting device, post-processing apparatus and image forming apparatus - Google Patents

Sheet collecting device, post-processing apparatus and image forming apparatus Download PDF

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Publication number
US20090212485A1
US20090212485A1 US12/193,931 US19393108A US2009212485A1 US 20090212485 A1 US20090212485 A1 US 20090212485A1 US 19393108 A US19393108 A US 19393108A US 2009212485 A1 US2009212485 A1 US 2009212485A1
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US
United States
Prior art keywords
sheet
leading edge
stopper
sheets
collecting board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/193,931
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English (en)
Inventor
Satoru Shimizu
Tsuyoshi Mizubata
Tomohiko Kiryu
Mikihiro Yamakawa
Tsutomu Anezaki
Masato Hizuma
Ryohei Sunayama
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.)
Konica Minolta Business Technologies Inc
Original Assignee
Konica Minolta Business Technologies 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 Konica Minolta Business Technologies Inc filed Critical Konica Minolta Business Technologies Inc
Assigned to KONICA MINOLTA BUSINESS TECHNOLOGIES, INC. reassignment KONICA MINOLTA BUSINESS TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANEZAKI, TSUTOMU, SUNAYAMA, RYOHEI, KIRYU, TOMOHIKO, MIZUBATA, TSUYOSHI, NIIZUMA, MASATO, SHIMIZU, SATORU, YAMAKAWA, MIKIHIRO
Publication of US20090212485A1 publication Critical patent/US20090212485A1/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
    • B65H31/02—Pile receivers with stationary end support against which pile accumulates
    • 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
    • B65H2405/20—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked on edge
    • B65H2405/22—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked on edge pocket like holder
    • B65H2405/221—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked on edge pocket like holder details of bottom
    • 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
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • 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
    • B65H2511/40—Identification
    • B65H2511/414—Identification of mode of operation
    • 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 improvement of a sheet collecting device which is provided on an image forming apparatus or on a post-processing apparatus.
  • a stapler that binds a plurality of sheets generally has a sheet collecting board on which plural sheets are stacked, and it conducts stitching process for sheets stacked on the sheet collecting board.
  • a folding device that folds therein a center portion of a sheet also has a sheet collecting board, and it conducts folding process for sheets stacked on the sheet collecting board.
  • a sheet collecting board (compile tray) is provided, and a sheet is caused to go up above the sheet collecting board by conveyance by a sheet ejection device, and the sheet released from the sheet ejection device falls on the sheet collecting board to be stopped at a prescribed position on the sheet collecting board.
  • a leading edge (trailing edge in the case of carrying-in) of a sheet is stopped at a fixed position or at a position for saddle stitching or center folding.
  • FIG. 1 shows an overall view of an image forming apparatus relating to an embodiment of the invention.
  • FIG. 2 is a diagram showing a sheet collecting device relating to an embodiment of the invention.
  • FIG. 3 is a diagram showing a sheet carry-in section of a sheet collecting device.
  • FIG. 4 is a block diagram of a control system of a post-processing apparatus relating to Embodiment 1 of the invention.
  • FIG. 5 is a flow chart of operations of a post-processing apparatus in saddle stitching/center folding.
  • FIG. 6 is a block diagram of a control system of a post-processing apparatus relating to Embodiment 1 of the invention.
  • FIG. 7 is a flow chart of operations of a post-processing apparatus in side stitching.
  • FIG. 1 is an overall view of an image forming apparatus relating to an embodiment of the invention equipped with image forming apparatus main body A and post-processing apparatus FS.
  • Illustrated image forming apparatus main body A is equipped with image reading section 1 , image processing section 2 , image writing section 3 , image forming section 4 , sheet-feeding cassette 5 , sheet-feeding device 6 , fixing unit 7 , sheet discharge section 8 and automatic two-sided copying sheet-feeding section (ADU) 9 .
  • the post-processing apparatus FS is connected on the illustrated left side of the image forming apparatus main body A, that is, the sheet discharge section 8 side.
  • a document placed on a document stand of automatic document feeding device DF is conveyed in the direction of an arrow, and images on one side or on two sides of the document are read by an optical system of image reading section 1 and further read into CCD image sensor 1 A.
  • Analog signals which have been converted photoelectically by CCD image sensor 1 A are subjected to analog processing, A/D conversion, shading correction and image compression in image processing section 2 , and then, are sent to image writing section 3 .
  • output light is emitted from a semiconductor laser of image writing section 3 , to irradiate photoconductor drum 4 A of image forming section 4 , so that a latent image is formed on the photoconductor drum 4 A.
  • processes such as charging, exposure, developing, transfer, separation and cleaning are conducted.
  • Recording sheet S 1 fed by sheet-feeding device 6 from sheet-feeding cassette 5 comes in contact with the photoconductor drum 4 A on which the latent image is made to be a toner image through developing process, and the toner image is transferred by transfer device 4 B onto the recording sheet S 1 .
  • the recording sheet S 1 carrying the toner image is subjected to fixing by fixing unit 7 , and is fed into post-processing apparatus FS from sheet discharge section 8 .
  • the recording sheet S 1 whose one side has been finished in terms of image processing is fed into automatic two-side copying sheet feeding section 9 through conveyance path switching plate 8 A, and is subjected to image processing on its reverse side in image forming section 4 to be discharged from sheet discharge section 8 after being fixed.
  • Post-processing apparatus FS has therein sheet carry-in section 20 , insertion sheet feeding sections 30 a and 30 b and a plurality of post-processing sections.
  • the post-processing section has therein punching process section 40 , folding process section 50 , superposing process section 60 , staplers 71 and 103 and sheet discharge section 80 .
  • Insertion sheet S 2 is loaded in insertion sheet feeding section 30 a
  • another insertion sheet S 3 is loaded in insertion sheet feeding section 30 b.
  • Insertion sheets S 2 and S 3 are sheets to be inserted in recording sheet S 1 discharged from image forming apparatus main body A, such as a cover sheet and an inserted sheet, and they can be subjected to punching process and folding process in the same way as recording sheet S 1 .
  • Inserted sheets S 2 and S 3 fed out of insertion sheet feeding sections 30 a and 30 b are conveyed to sheet carry-in section 20 through a conveyance path running downward (having no reference symbol).
  • Punching process section 40 is arranged on sheet carry-in section 20 .
  • recording sheet S 1 insertion sheets S 2 and S 3 are given a generic name of sheet S.
  • Folding process section 50 is arranged on conveyance path H 1 that is branched downward from sheet carry-in section 20 .
  • Superposing process section 60 is arranged at downstream side of conveyance path H 2 that is branched upward from sheet carry-in section 20 , and is equipped with conveyance paths H 3 , H 4 and H 5 .
  • the superposing process section 60 causes succeeding sheet S to stand by at conveyance path H 4 and conveyance paths H 3 and H 5 to secure a period of time for preceding sheet S to conduct stitching process in stapler 71 located on the downstream side.
  • the conveyance path positioned at the downstream side of conveyance path H 2 is branched into conveyance paths which are curved doubly as inside conveyance path H 4 and outside conveyance paths H 3 and H 5 .
  • conveyance roller 21 On an exit of conveyance path H 4 that is branched from conveyance path H 2 to form a curved inside conveyance path, there is provided conveyance roller 21 .
  • the conveyance roller 21 is at standstill and stops a leading edge of the first sheet. It causes the first sheet to stand by under the condition that the first sheet is in contact with conveyance roller 21 .
  • Sheet S conveyed through conveyance path H 4 stands by under the state where its leading edge is stopped by conveyance roller 21 as stated above, while, a succeeding sheet S enters conveyance path H 3 from conveyance path H 2 and arrives at the conveyance roller 21 .
  • preceding sheet S and succeeding sheet S are conveyed together under the state where both sheets S are superposed, and are conveyed to collecting section 70 .
  • Conveyance path H 3 is connected with conveyance path H 2 at the downstream side of the conveyance path H 2
  • conveyance path H 5 is connected with conveyance path H 3 .
  • the conveyance path H 3 is branched into conveyance path H 5 and conveyance path H 6 .
  • Conveyance path H 6 forms a sheet discharge path through which sheet S is discharged to fixed sheet discharge tray 81 .
  • Fixed sheet discharge tray 81 is arranged at a position so as to be protruded from post-processing apparatus FS that is at the downstream side of conveyance path H 6 branched from superposing process section 60 at conveyance rollers 24 on conveyance path H 3 .
  • sheet S conveyed through conveyance paths H 2 , H 3 and H 6 and discharged is stacked on the fixed sheet discharge tray 81 .
  • Sheet discharge section 80 has sheet discharge roller 22 , and discharges sheet S on elevating sheet discharge tray 82 .
  • the sheet discharge rollers 22 are composed of a pair of rollers, and in the case of non-sheet-discharge, the paired rollers stay apart from each other, while, in the case of sheet discharge, the paired rollers come in contact with each other to nip and convey sheet S to discharge it on the elevating sheet discharge tray 82 .
  • Sheet S conveyed by conveyance roller 21 travels in the direction toward a left side between a pair of rollers 22 which stay away from each other, and when a trailing edge of the sheet S leaves the conveyance roller 21 , the sheet S falls on collecting section 70 to slide down its slope, and it is caught by a stopper (not shown) to stop on the collecting section 70 .
  • stapler 71 After the set number of sheets S have been stacked on the collecting section 70 , stapler 71 operates to stitch the sheets S.
  • the sheets S thus stitched are lifted up by the aforesaid stopper, and move on the collecting section 70 toward a left side.
  • a pair of rollers constituting the sheet discharge rollers 22 come in contact with each other to nip and convey sheet S to discharge it on the elevating sheet discharge tray 82 .
  • sheet S is conveyed downward through conveyance path H 1 from sheet carry-in section 20 , and then, is subjected to center folding or folding into three in folding process section 50 , and is discharged to lower sheet discharge tray 83 .
  • sheet S is conveyed downward through conveyance path H 1 from sheet carry-in section 20 .
  • the sheet S is subjected to saddle-stitching process in stapler 103 and is discharged to lower sheet discharge tray 83 after being subjected to center folding process in folding process section 50 .
  • Sheet discharge paths for sheet S include the following four paths;
  • Paths 1), 2) and 4) are those described above.
  • Path 3 is selected when forming a large amount of images without conducting stitching process and folding process.
  • Sheet S is discharged on elevating sheet discharge tray 82 without any post processing, and the elevating sheet discharge tray 82 moves downward as shown by chain lines in FIG. 1 so that the uppermost surface of discharged sheets S may be always at the constant height.
  • a sheet collecting device relating to Embodiment 1 of the invention will be described as follows, referring to FIGS. 2 and 3 .
  • FIG. 2 is a diagram showing a sheet collecting device relating to an embodiment of the invention
  • FIG. 3 is a diagram showing a sheet carry-in section of a sheet collecting device.
  • the numeral 100 represents an intermediate stack tray that is a sheet collecting board supporting sheets S to be stitched or folded
  • 101 represents a guide that constitutes conveyance path H 1 in FIG. 1
  • 102 represents a conveyance roller that forms a lower end of a sheet ejection section which ejects a sheet to intermediate stack tray 100
  • 103 represents a stapler that conducts stitching process for sheets S
  • 104 represents an aligning member that aligns sheets S in their width direction (direction perpendicular to the conveyance direction)
  • 105 represents a leading edge stopper that stops sheet S having been conveyed and that supports sheet S on intermediate stack tray 100
  • 106 represents an gripping member that grips sheet S
  • 52 represents a folding plate
  • 53 - 55 represent folding rollers.
  • the folding rollers 53 - 55 constitute a folding process section 50 .
  • the intermediate stack tray 100 is provided below conveyance path H 1 as is illustrated.
  • the intermediate stack tray 100 is provided to be inclined so that a downstream side in the conveyance direction may be positioned to be lower and an upstream side may be positioned to be upper, thus, sheet S ejected on the intermediate stack tray 100 slides down along the intermediate stack tray 100 and is caught by the leading edge stopper 105 to be stopped.
  • the stapler 103 conducts stitching operations to staple sheets on the intermediate stack tray 100 .
  • the aligning member 104 is driven by motor M 2 to be reciprocated in the width direction that is perpendicular to the conveyance direction of sheet S, to align edges of sheets S in the width direction.
  • the leading edge stopper 105 is driven by motor M 1 representing a stopper moving device to move in the sheet conveyance direction, and is set at the position corresponding to a sheet size.
  • a position for the leading edge stopper 105 to be set at will be described as follows, referring to FIG. 3 .
  • Sheet S conveyed by conveyance roller 102 that serves as an ejecting device that ejects sheet S to the intermediate stack tray 100 falls at the moment when it leaves conveyance rollers 102 that forms an ejection exit through which the sheet is ejected, and it is caught by the leading edge stopper 105 to be placed on the intermediate stack tray 100 .
  • the leading edge stopper 105 is set so that the sheet S may stop after the trailing edge leaves conveyance roller 102 surely.
  • the leading edge stopper 105 is driven by motor M 1 to move to be set so that trailing edge position H 2 of sheet S that is placed on the intermediate stack tray 100 may be always at a constant height, even in the case where sheets S each having a different size are conveyed.
  • a plurality of sheets S are placed on the intermediate stack tray 100 and when plural sheets are placed, succeeding sheet S is supplied to the intermediate stack tray 100 under the state where preceding sheet S exists on the intermediate stack tray 100 .
  • the leading edge of the succeeding sheet is ejected along a path shown with chain line L 1 from conveyance roller 102 .
  • Path L 1 is determined by a shape of a conveyance path although it may be slightly changed depending on properties of sheet S, and it does not take a position that is higher than the upper limit leading edge landing point shown by landing position height H 3 where the Leading edge of sheet S lands on the intermediate stack tray 100 .
  • the upper limit of height H 3 of the landing position is determined, in a design stage of the device, by a sheet-feeding test wherein the maximum thickness of sheets S stacked on the intermediate stack tray 100 is estimated.
  • gripping member 106 rotates in the direction of arrow W 1 to grip sheet S. In this case, the gripping member 106 moves together with leading edge stopper 105 .
  • the gripping member 106 is driven by solenoid SL to rotate in the direction of arrow W 1 , and grips sheet S between the intermediate stack tray 100 and the gripping member 106 .
  • leading edge stopper 105 is set to the position where a center line of sheet S in its conveyance direction agrees with a stapling position of stapler 103 , under the state where sheet S is gripped by gripping member 106 .
  • Folding process section 50 has folding plate 52 and folding rollers 53 , 54 and 55 .
  • leading edge stopper 105 is set to the position where a center line of sheet S agrees with a middle position between folding roller 53 and folding roller 54 .
  • sheet S is inserted in a space between both rollers 53 and 54 , and when folding rollers 53 and 54 are rotated under the condition that sheet S is inserted, the sheet S is conveyed while it is subjected to the folding process.
  • a processing apparatus that conducts folding process by using folding plate and three folding rollers 53 - 55 is widely known, and for example, those disclosed in Unexamined Japanese Patent Application Publication No. 2006-56669 can be used.
  • leading edge stopper 105 moves to the first stop position that is a position for stacking sheets S, the second stop position for a stitching process and to the third stop position for a folding process, and as is shown with dotted lines in FIG. 2 , the leading edge stopper 105 and the gripping member 106 move unitedly when they move between the aforesaid plural stop positions.
  • FIG. 4 is a block diagram of a control system of a post-processing apparatus relating to Embodiment 1 of the invention
  • FIG. 5 is a flow chart of operations of a post-processing apparatus in saddle stitching-center folding
  • FIG. 7 is a flow chart of operations of a post-processing apparatus in side stitching.
  • the numeral 200 represents a control device provided on post-processing apparatus FS
  • 201 represents a main control device that is provided on an image forming apparatus main body and controls an overall image forming apparatus.
  • the control device 200 controls post-processing apparatus FS shown in FIG. 1 .
  • step ST 1 sheet size information, namely, size information such as A4 size and B4 size are acquired from the main control device 201 .
  • this size information includes information of longitudinal feeding (conveyance wherein a length in a width direction is of the long side) and information of lateral feeding (conveyance wherein a length in a conveyance direction is of the long side).
  • step ST 2 motor M 1 operates, and leading edge stopper 105 moves to the first stop position.
  • the first stop position is a position where sheet S is supported so that the trailing edge of sheet S on intermediate stack tray 100 in the case of carry-in in all sheet sizes may be at the height shown by H 2 in FIG. 3 .
  • Sheets S of the set quantity are supplied to intermediate stack tray 100 while leading edge stopper 105 is set to the first stop position.
  • Sheet alignment in step ST 3 means operations wherein the aligning member 104 is driven by motor M 2 to be reciprocated in the width direction, and this sheet alignment is carried out every time each sheet S is supplied.
  • solenoid SL operates in step ST 4 to rotate gripping member 106 , whereby, edges of sheets S are gripped.
  • step ST 5 a judgment is made whether the mode is for saddle stitching-center folding or for center folding in which no saddle stitching is carried out.
  • the judgment in step ST 5 is made based on information coming from main control device 201 .
  • motor M 1 operates to move leading edge stopper 105 in step ST 6 .
  • a movement of the leading edge stopper 105 is a movement to the second stop position where a center line of sheet S in its conveyance direction agrees with a stapling position of stapler 103 .
  • step ST 7 stitching process for stapling on sheets S is carried out, and in step ST 8 , edges of sheets S are gripped again by gripping member 106 .
  • Gripping of sheet S is continued while leading edge stopper 105 is moving, and the gripping is released when the movement of the leading edge stopper 105 is completed and when the sheet S is set to the set height.
  • leading edge stopper 105 moves and stops. This movement in ST 9 is to move leading edge stopper 105 to the third stop position where the center line of sheet S agrees with a middle position between folding roller 53 and folding roller 54 .
  • step ST 10 the sheets are folded.
  • the folded sheets S are discharged to lower sheet discharge tray 83 .
  • step ST 5 In a folding process without stitching, namely, in a center folding process, the procedure proceeds from step ST 5 to step ST 11 , then, leading edge stopper 105 is moved to the third stop position, and a center line of sheet S in the conveyance direction is caused to agree with a middle position between folding roller 54 and folding roller 55 .
  • step ST 12 that follows step ST 11 , a folding process is carried out, and the sheet S folded in step ST 12 is discharged to end the processes.
  • FIG. 6 is a diagram showing a sheet collecting device relating to Embodiment 2 of the invention
  • FIG. 7 is a flow chart of operations of Embodiment 2.
  • Embodiment 2 is an example wherein side stitching is carried out for sheets S stacked on an intermediate stack tray.
  • Side stitching is a processing to stitch edges of sheets S.
  • stitched sheets S are discharged without being folded.
  • Leading edge stopper 105 supports sheet S under the illustrated state, in collecting and in stitching process of sheet S.
  • leading edge stopper 105 is driven by solenoid SLa to rotate in the direction of arrow W 2 , and releases sheet holding.
  • Sheet S released in terms of holding falls along intermediate stack tray 100 to be discharged.
  • steps from step ST 1 to step ST 4 are the same as those in FIG. 5 , and sheet S is gripped by gripping member 106 at the first stop position.
  • step ST 20 following ST 4 leading edge stopper 105 moves so that a stitching position of sheet S may agree with stitching position of stapler 103 .
  • step ST 21 stapler 103 conducts a stitching process
  • step ST 22 gripping member 106 releases gripping and leading edge stopper 105 rotates in the direction of arrow W 2 to cause sheet S to fall, thus, sheet S is discharged.
  • a sheet is caused to fall in the direction of ejecting from a sheet ejecting device on a sheet collecting board, and a position of a leading edge stopper is set so that a trailing edge of the sheet (upper end) may be at a constant position, whereby, downsizing is possible and a sheet collecting device that operates stably can be realized.
US12/193,931 2008-02-22 2008-08-19 Sheet collecting device, post-processing apparatus and image forming apparatus Abandoned US20090212485A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JPJP2008-041346 2008-02-22
JP2008041346A JP2009196779A (ja) 2008-02-22 2008-02-22 シート集積装置、後処理装置及び画像形成装置

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Cited By (3)

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US20090200732A1 (en) * 2008-02-13 2009-08-13 Konica Minolta Business Technologies, Inc. Sheet discharging apparatus, sheet finishing apparatus, and image forming apparatus
US20110233858A1 (en) * 2010-03-26 2011-09-29 Konica Minolta Business Technologies, Inc. Sheet ejection device, post-processing apparatus and image forming system
US11345561B2 (en) * 2018-11-30 2022-05-31 Seiko Epson Corporation Medium processing device

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JP5627410B2 (ja) * 2010-11-18 2014-11-19 キヤノン株式会社 シート処理装置、画像形成装置
JP5782909B2 (ja) * 2011-08-09 2015-09-24 コニカミノルタ株式会社 用紙折り装置及び画像形成システム
JP6065426B2 (ja) * 2012-07-03 2017-01-25 富士ゼロックス株式会社 記録材処理装置および画像形成システム
JP5942788B2 (ja) * 2012-11-05 2016-06-29 コニカミノルタ株式会社 用紙処理装置及び画像形成システム

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US20090200732A1 (en) * 2008-02-13 2009-08-13 Konica Minolta Business Technologies, Inc. Sheet discharging apparatus, sheet finishing apparatus, and image forming apparatus
US20110233858A1 (en) * 2010-03-26 2011-09-29 Konica Minolta Business Technologies, Inc. Sheet ejection device, post-processing apparatus and image forming system
US8408540B2 (en) * 2010-03-26 2013-04-02 Konica Minolta Business Technologies, Inc. Sheet ejection device, post-processing apparatus and image forming system
US11345561B2 (en) * 2018-11-30 2022-05-31 Seiko Epson Corporation Medium processing device
US20220234858A1 (en) * 2018-11-30 2022-07-28 Seiko Epson Corporation Medium processing device
US11780698B2 (en) * 2018-11-30 2023-10-10 Seiko Epson Corporation Medium processing device

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