JP3890922B2 - Post-processing equipment - Google Patents

Post-processing equipment Download PDF

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Publication number
JP3890922B2
JP3890922B2 JP2001171147A JP2001171147A JP3890922B2 JP 3890922 B2 JP3890922 B2 JP 3890922B2 JP 2001171147 A JP2001171147 A JP 2001171147A JP 2001171147 A JP2001171147 A JP 2001171147A JP 3890922 B2 JP3890922 B2 JP 3890922B2
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JP
Japan
Prior art keywords
holding
sheet
paper
post
processing
Prior art date
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Expired - Fee Related
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JP2001171147A
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Japanese (ja)
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JP2002362825A (en
Inventor
龍一 佐藤
佳幸 高石
Original Assignee
富士ゼロックス株式会社
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Priority to JP2001171147A priority Critical patent/JP3890922B2/en
Publication of JP2002362825A publication Critical patent/JP2002362825A/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a post-processing apparatus used in an image forming apparatus such as a copying machine, a laser printer, or a facsimile, and more particularly to a high-productivity post-processing apparatus having a large number of post-processing units per unit time.
[0002]
[Prior art]
In recent years, in image forming apparatuses such as copiers, laser printers, and facsimile machines, the enhancement of post-processing apparatuses that perform punch processing, stapling, and the like has been remarkable, and after being downsized and multifunctional The added value is improved by the processing device. Also in the staple processing, post-processing devices that process one-point binding or two-point binding online along the vertical direction or the horizontal direction of the paper on which the image is formed by the image forming apparatus have become commonplace.
[0003]
However, in such a post-processing apparatus, in order to perform stapling processing rich in variations such as one-point binding or two-point binding on a sheet on which an image has been formed with an increase in productivity, a stapling unit is set in a predetermined manner. Since it takes time to move to a position or to discharge a bundle of sheets that have undergone stapling, conventionally, a method of delaying the paper feeding timing of the image forming apparatus by the time required for stapling has been taken. Sex will get worse.
[0004]
Therefore, as disclosed in Japanese Patent Laid-Open No. 10-250914, when time is required for setting processing of staples or the like, by providing a conveyance path that bypasses the first few sheets that are discharged during the setting processing. A means for improving productivity by overlapping sheets on the bypass conveyance path has already been proposed.
[0005]
A sheet post-processing apparatus according to Japanese Patent Laid-Open No. 10-250914 includes a sheet receiving unit that receives sheets sequentially sent from an image forming apparatus, and a post-processing unit that receives sheets from the sheet receiving unit and performs stapling processing and the like. A paper discharge unit that discharges the paper that has been post-processed by the post-processing unit, a post-processing conveyance path that guides the paper from the paper receiving unit to the paper discharge unit through the post-processing unit, A sheet post-processing apparatus having a plurality of conveying units disposed in the post-processing conveyance path and configured to convey a sheet; and a plurality of sheets stacked on the post-processing conveyance path upstream of the post-processing unit. The superimposing means, the superimposing means branching the post-processing transport path into a plurality of parts, and a plurality of superposed transport paths that merge again, and a first transport means respectively disposed in the superposed transport path; The overlap Between the second conveying means disposed on the most upstream side of the post-processing conveying path downstream from the merging point where the first conveying means on the most downstream side of the pair conveying path and the overlapping conveying path meet, It is configured to have stopper means for shielding or opening the conveyance path.
[0006]
[Problems to be solved by the invention]
However, the conventional technique has the following problems. That is, in the case of the paper post-processing apparatus according to the above-mentioned Japanese Patent Application Laid-Open No. 10-250914, the paper is superposed using the post-processing transport path and the superposition transport path so as to improve productivity. In general, only two sheets can be overlapped, so that the effect of improving productivity cannot be obtained sufficiently. Further, in the case of the paper post-processing apparatus, two transport paths, a post-processing transport path and a superposition transport path, are required as the paper transport path, and thus the reliability with respect to paper jams is reduced. There are problems that the cost is increased, the machine size is large, and the operability of jam removal is also deteriorated.
[0007]
Further, in the case of the paper post-processing apparatus according to the above-mentioned JP-A-10-250914, the post-processing transport path and the superposition transport path are not provided, but the post-processing transport path upstream of the post-processing unit is A superimposing unit that superimposes a plurality of sheets, wherein the superimposing unit includes a stopper unit for stopping and releasing the conveyance of the sheet in the post-processing conveyance path, and a trailing end of the sheet stopped by the stopper unit. The presser claw is configured to hold, and the rear end of the paper stopped by the stopper unit is pressed by the presser claw so that a plurality of sheets are overlapped, and the stopper unit is opened so that the plurality of sheets are stacked and conveyed. A configuration that has been proposed is also proposed.
[0008]
However, in the case of such a configuration, a stopper means and a pressing claw are provided in the post-processing conveyance path, and the stopper means and the pressing claw are operated at a predetermined timing so that a plurality of sheets are stacked and conveyed. Therefore, since the control of the stopper means and the presser claw is complicated, the transportability per unit time of the paper is affected by the operation speed of the stopper means and the like, so that a sufficiently high productivity cannot be maintained. Has a point. Further, in the case of the paper post-processing apparatus according to the above proposal, since the interval between the stopper means and the pressing claw needs to be set according to the size of the paper, when the paper size changes, the stopper means and the pressing claw. It is difficult to change the presser claw to fit any size of paper in the paper transport path, and it must be compatible with various sizes. Has the problem of being difficult.
[0009]
Therefore, the present invention was made to solve the above-mentioned problems of the prior art, and the object of the present invention is to improve the operability of jam removal without causing an increase in cost and machine size. In addition, an object of the present invention is to provide a post-processing apparatus capable of realizing high productivity for various sizes of paper.
[0010]
[Means for Solving the Problems]
That is, the invention described in claim 1 is a post-processing device provided with a post-processing unit that performs predetermined post-processing on a sheet on which an image is formed by the image forming device, and is discharged from the image forming device. A sheet conveying unit that receives and conveys the sheet to be conveyed, a sheet discharging unit that discharges the sheet conveyed by the sheet conveying unit onto a sheet alignment tray, and a plurality of sheets that are discharged onto the sheet alignment tray. A sheet aligning unit; a post-processing unit that performs post-processing on the sheet bundle aligned on the sheet aligning tray; and a sheet discharging unit that moves to a position where the sheet can be held above the sheet aligning tray at a predetermined timing. To temporarily hold the paper ejected on the paper alignment tray and move it to a position where the paper is released at a predetermined timing to align the temporarily held paper. And temporary holding means for loading on Rei, The temporary holding means includes a paper holding position for holding paper according to the size in the width direction orthogonal to the conveyance direction of the paper discharged from the image forming apparatus, and a retreat position for not holding paper. When a reference position is set and a mode that requires sheet holding is selected, the temporary holding unit moves to the retracted position, does not hinder the alignment of the last sheet of the previous sheet bundle, and It is controlled to move to the paper holding position at a timing at which the first sheet of the paper bundle can be held. The post-processing apparatus is characterized by the above.
[0012]
further, Claim 2 The invention described in Claim 1 In the post-processing apparatus described in (1), the temporary holding unit also serves as a width-direction aligning unit that aligns a width direction orthogonal to the sheet conveyance direction.
[0013]
Furthermore, Claim 3 The invention described in Claim 2 In the post-processing apparatus described in the above, the temporary holding unit includes a retreat position that does not perform paper holding and alignment according to the size in the width direction orthogonal to the conveyance direction of the paper discharged from the image forming apparatus, and paper alignment. When the alignment position for aligning the width direction of the paper on the tray, the paper holding position for holding the paper, and the reference position are set, and the mode that requires paper holding is selected, the temporary holding means Before the first sheet is ejected from the sheet ejecting means, the sheet is moved to the retracted position, and the sequentially ejected sheets are aligned by reciprocating the aligning position and the retracted position to align the final sheet of the sheet bundle. After the completion, the post-processing device is controlled to move to the holding position when the next sheet bundle exists.
[0014]
or, Claim 4 The invention described in Any one of claims 1 to 3 In the post-processing apparatus described in 1), when an unnecessary sheet is mixed in the temporary holding unit, the temporary holding unit is moved to a reference position.
[0015]
Furthermore, Claim 5 The invention described in Claim 3 The holding position of the temporary holding unit is set between the retracted position and the alignment position, and the temporary holding unit is not limited to the paper holding position even if it is between the alignment position and the paper holding position. Is a post-processing apparatus that is configured to be capable of holding
[0016]
Also, Claim 6 The invention described in Claims 1, 2, 5 In the post-processing apparatus according to any one of the claims, a paper holding groove for holding both ends of the paper is formed in the temporary holding unit, and the paper holding groove is arranged in the paper transport direction after the paper holding groove. The post-processing apparatus is characterized in that a rear end reference wall for aligning the rear ends in the vertical direction along the sheet conveyance direction is provided at the end.
[0017]
further, Claim 7 The invention described in Claim 6 In the post-processing apparatus described in the above, the temporary holding means is set with a holding paper alignment position for performing alignment in the width direction orthogonal to the paper transport direction in a state where the paper is temporarily held. The post-processing device is controlled to perform alignment of the holding paper by moving from the holding position to the holding paper alignment position.
[0018]
or, Claim 8 The invention described in Claim 6 The post-processing apparatus described in 1) further includes a clamping unit that clamps the leading end portion of the sheet held by the temporary holding unit, and the clamping unit is positioned above the discharge path of the sheet bundle. The post-processing apparatus is characterized.
[0019]
Furthermore, Claim 9 The invention described in Claim 8 In the post-processing apparatus described in the above, the holding means includes a fixedly arranged upper holding member, a lower holding member configured to be rotatable, and a rotating means, and a sheet to be held in the temporary holding means. Is held so that the lower clamping member rotates and clamps the paper together with the upper clamping member, and when the temporary holding means finishes the holding operation, it rotates in the opposite direction to release the clamping of the paper. The post-processing apparatus is characterized by being configured.
[0020]
Also, Claim 10 The invention described in Claim 8 In the post-processing apparatus described in the above, the holding unit includes an alignment wall that aligns the leading end of the paper held by the temporary holding unit, and a moving unit that moves the holding unit, and the temporary holding unit. Alignment for aligning the holding position corresponding to the size in the vertical direction along the conveyance direction of the paper held by the means, the standby position for retreating in the mode where no paper holding is required, and the paper held by the holding means And a position detection unit capable of detecting the position of the holding unit, and when a mode that requires holding of a sheet between the sheet bundles is selected, the holding unit should be held from the sheet discharge unit The post-processing apparatus is controlled to move to a standby position before the sheet is discharged.
[0021]
further, Claim 11 The invention described in Claim 10 In the post-processing apparatus, the standby position of the clamping unit is such that the length from the rear end reference wall provided in the temporary holding unit through the guide groove to the alignment wall provided in the clamping member is The alignment position of the clamping member is set to be a distance from the rear end reference wall formed in the temporary holding means through the guide groove to the alignment wall formed in the clamping means. Is a post-processing apparatus characterized by being set to be equal to or smaller than the vertical size of the paper.
[0022]
Furthermore, Claim 12 The invention described in Claim 10 or 11 In the post-processing apparatus described in the above, the holding means repeats reciprocation from the standby position to the alignment position every time the temporarily held paper is discharged, and the alignment position where the final paper of the temporary holding paper is aligned. After the movement, the clamping means is controlled so as to perform a clamping operation at the holding sheet alignment position.
[0023]
Furthermore, Claim 13 The invention described in Claim 7 or 12 In the post-processing apparatus described in (1), the clamping unit performs clamping before moving to the retracted position after the temporary holding unit determines the position at the holding sheet alignment position where the final sheet of the sheets that need to be temporarily stored is aligned. This is a post-processing apparatus.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0025]
Embodiment 1
FIG. 3 shows an image forming apparatus to which the post-processing apparatus according to Embodiment 1 of the present invention can be applied.
[0026]
In FIG. 3, reference numeral 1 denotes an image input unit that reads an image of a document (not shown) using an ADF (Auto Document Feeder) or receives a series of image information from a host computer or the like. Is output to the laser scanning unit 2. The laser scanning unit 2 irradiates laser light on the photosensitive drum 3 uniformly charged in advance by the primary charger 4 based on image information at one or two exposure positions according to the image forming mode. Thus, an electrostatic latent image is formed. The electrostatic latent image formed on the photosensitive drum 3 is developed with different color toners by one or both of the developing unit 5 and the developing unit 6 as necessary. Further, the toner image developed on the photosensitive drum 3 is fed from the sheet storage unit 9 of the sheet feeding unit 10 and is transferred onto the recording sheet S fed by the registration roll 11 at a predetermined timing. Is transcribed by. The recording sheet S to which the toner image has been transferred is conveyed to the fixing device 13 by the conveying belt 12, and the toner image is fixed on the recording sheet S by heat and pressure by the fixing device 13. The recording sheet S on which the toner image has been fixed passes through the discharge path 16 and is discharged as it is by the discharge roll 15 according to the image forming mode, or is directly discharged from the apparatus by the sheet reversing mechanism 14. Then, the paper is discharged from the discharge roll 15 to the outside of the apparatus in a state where the transport direction and the front and back sides are reversed as necessary, or to the image forming portion of the photosensitive drum 3 again via the duplex / multiple recording passage 26. It is conveyed and double-sided or multiple recording is performed.
[0027]
Incidentally, the toner remaining on the surface of the photosensitive drum 3 after the image forming process is removed by the cleaning device 8 is prepared for the next image forming process.
[0028]
FIG. 4 shows a sheet reversing mechanism of the image forming apparatus.
[0029]
In FIG. 4, reference numeral 14 denotes a sheet reversing mechanism provided in the discharge unit of the image forming apparatus. Is formed in a linear shape obliquely upward, and below the discharge passage 16 is an inlet passage 17 extending obliquely downward from the upstream side of the discharge passage 16 in the conveyance direction of the recording paper S, and The delivery passage 18 extending obliquely downward from the downstream side of the discharge passage 16 in the conveyance direction of the recording paper S is disposed so as to form a substantially triangular shape. A switching member 27 for switching the recording paper S discharged from the fixing device 13 between the discharge passage 16 side and the feed passage 17 side is disposed at the inlet portions of the discharge passage 16 and the feed passage 17 so as to be tiltable. ing.
[0030]
Further, a tri-roll 19 constituting a part of the paper reversing device 14 is disposed between the feeding passage 17 and the sending passage 18 of the paper reversing device 14. The tri-roll 19 has a nip portion between the first driven roll 19A and the driving roll 19B located in the feeding passage 17, and a nip portion between the driving roll 19B and the driven roll 19C located in the feeding passage 18. The driven roll 19A, the drive roll 19B, and the driven roll 19C are arranged in a state where they are in pressure contact with each other.
[0031]
Further, as shown in FIG. 4, the reversing passage 25 is connected to the lower end of the joining portion located at the lower end of the feeding passage 17 and the sending passage 18 in an inclined state. Are formed so that a drawing portion 25A extending downward in the vertical direction and a double-sided / multiple recording passage 26 are branched. A switching member 20 for switching the conveyance direction of the recording paper S is disposed at a branch portion between the drawing portion 25A and the duplex / multiple recording path 26. A Mylar sheet or the like is disposed at the lower end of the switching member 20. A shield plate 31 made of a synthetic resin film is projected downward. The switching member 20 is disposed so that the shield plate 31 is in the position shown in the drawing in a normal state. A forward / reverse roll 21 and a pinch roll 22 for transporting the recording paper S are disposed at the upper end of the drawing section 25A so as to be in pressure contact with each other. The pinch roll 22 can be released from the pressure contact state with the forward / reverse rotation roll 21 by a solenoid 24 via a link 23.
[0032]
In FIG. 4, reference numeral 23 </ b> A denotes a fulcrum of the link 23, 24 </ b> A denotes an operating rod of the solenoid 24, and 29 denotes a detection unit of the recording paper detection sensor 28.
[0033]
In the paper reversing mechanism 14 configured as described above, the paper reversing operation is performed as follows.
[0034]
In the single-sided copy normal discharge mode in the image forming apparatus, the drive motor for driving the drive roll 19B of the tri-roll 19 of the sheet reversing mechanism 14 is stopped, and is arranged at the entrance of the discharge passage 16 as shown in FIG. The recording sheet S fixed by the fixing device 13 in a state where the provided switching member 27 is lowered is passed over the switching member 27 via the discharge passage 16 and is directly discharged from the discharge roll 15 to the outside of the apparatus. Discharged.
[0035]
In the single-sided copy reversal discharge mode in the image forming apparatus, the drive motor for driving the drive roll 19B of the tri-roll 19 of the paper reversing mechanism 14 is driven to drive the driven roll 19A, the drive roll 19B, and the driven roll 19C of the tri-roll 19. And are driven to rotate. As shown in FIG. 4, the switching member 27 disposed in the discharge passage 16 is pulled upward by a solenoid (not shown) and switched from the discharge passage 16 side to the inflow passage 17 side. Then, the recording sheet S fixed by the fixing device 13 is transported to the feeding path 17 with the transport direction being switched by the switching member 27, and the driven roll 19 </ b> A and the driving roll 19 </ b> B located in the feeding path 17. Is guided to the forward / reverse roll 22 in the forward rotation state via the reverse passage 25 by the driving force of the drive roll 19B. As a result, the recording sheet S is once guided into the reversing passage 25, but the upper end portion of the recording sheet S is located above the lower end portion of the shield plate 31 of the switching member 20.
[0036]
The recording sheet S once guided into the reversing passage 25 by the forward / reverse roll 22 is positioned at a position higher than the lower end of the shield plate 31 of the switching member 20, so that the forward / reverse rotation is reversed. It is conveyed again to the reverse passage 25 by the roll 22, and is guided to the nip portion constituted by the drive roll 19B and the driven roll 19C disposed in the delivery passage 18 through the reverse passage 25, and the conveyance force of the drive roll 19B. Is conveyed to the discharge roll 15.
[0037]
Further, in the double-sided copying mode in the image forming apparatus, the driving motor for driving the driving roll 19B of the tri-roll 19 of the paper reversing mechanism 14 is driven, and the driven roll 19A and the driving roll 19B of the tri-roll 19 are driven. Further, as shown in FIG. 4, the switching member 27 disposed in the discharge passage 16 is pulled upward by a solenoid (not shown) and switched from the discharge passage 16 side to the inflow passage 17 side. The operation up to the forward / reverse roll 22 in the forward rotation state is the same as that in the single-sided copy reverse discharge mode. When the reversal timing of the recording sheet S is delayed from the single-sided copy reversal discharge mode, the upper end portion of the recording sheet S is the lower end portion of the switching member 20 disposed at the branch portion between the reversing passage 25 and the duplex / multiple recording passage 26. The switching member 20 is switched to the double-sided / multiple recording path 26 side by its own weight. Therefore, the recording sheet S conveyed again by the reversible forward / reverse roll 22 is conveyed via the switching member 20 to the duplex / multiple recording path 26 with the surface on which the toner image is formed facing up. . The recording sheet S is conveyed again to the image forming section with the surface on which the toner image is formed facing down through the double-sided / multiple-recording passage 26 formed so as to be bent and folded. A toner image is formed on the back surface of S. The subsequent operation is the same as in the single-sided copy normal discharge mode, and the recording paper S on which the toner images are formed on both sides passes through the fixing device 13 and then passes through the discharge path 16 to the outside of the apparatus by the discharge roll 15. Discharged.
[0038]
If necessary, in the single-side multiplex recording mode, the recording sheet S on which the toner image is formed on one side is not conveyed to the drawing portion 25A of the reversing passage 25 by switching the switching member 20. Via the reversing passage 25 and the duplex / multiple recording passage 26, the toner image is conveyed again to the image forming unit so that the surface on which the toner image is formed is located on the photosensitive drum 3 side, and the toner is applied to the surface of the recording paper S. Multiple images are transferred and discharged in the same manner as in the single-sided copy normal discharge mode.
[0039]
By the way, the post-processing apparatus according to this embodiment includes a post-processing unit that performs a predetermined post-processing on a sheet on which an image is formed by the image forming apparatus. A sheet conveying unit that receives and conveys the sheet to be conveyed, a sheet ejection unit that ejects the sheet conveyed by the sheet conveying unit onto a sheet alignment tray, and a plurality of sheets that are ejected onto the sheet alignment tray. Sheet aligning means, post-processing means for performing post-processing on the sheet bundle aligned on the sheet aligning tray, and moving to a position where the sheet above the sheet aligning tray can be held at a predetermined timing, and discharging the sheet Means to temporarily hold the paper discharged onto the paper alignment tray and move it to a position where the paper is released at a predetermined timing. Is configured to include a temporary holding means for stacking on the tray alignment, the.
[0040]
1 and 2 show an embodiment of a post-processing apparatus used in combination with the image forming apparatus.
[0041]
In FIG. 2, reference numeral 40 denotes a main body of the post-processing apparatus, and the post-processing apparatus main body 40 is disposed so as to face the paper discharge unit of the image forming apparatus. In the upper part of the side surface of the post-processing apparatus main body 40, an introduction port 41 into which the recording paper S discharged from the paper discharge unit of the image forming apparatus is introduced is opened. Inside the introduction port 41, a transport roll pair 42 as a paper transport unit for transporting the paper S is provided. The sheet conveyance path ahead of the pair of conveyance rolls 42 is branched into two sheet conveyance paths 43 and 44, and the conveyance direction of the sheet S is switched by a gate (not shown). When post-processing is not performed on the paper discharged from the image forming apparatus, the discharge roll is switched to the upper paper transport path 43 and the transport roll pair 45 provided in the paper transport path 43. 46 is discharged onto the upper discharge tray 47. Further, when post-processing is performed on the sheet S discharged from the image forming apparatus, the sheet is switched to the lower sheet conveyance path 44 and a conveyance roll as a sheet conveyance unit provided in the sheet conveyance path 44. Through the pair 48, the sheet is discharged onto the sheet alignment tray 50 disposed in the post-processing apparatus main body 40 by the discharge roll pair 49. A bundle of sheets made up of a plurality of sheets sequentially discharged onto the sheet aligning tray 50 is aligned by an aligning unit described later, subjected to post-processing by a post-processing unit 51, and then conveyed by a sheet bundle conveying unit 52. Then, the paper is discharged by a discharge roll 53 onto a lower stacking tray 54 provided outside the post-processing apparatus main body 40.
[0042]
FIG. 1 shows a main part of an embodiment of a post-processing apparatus used in combination with the image forming apparatus.
[0043]
As described above, the sheet S conveyed by the conveyance roll pair 48 along the lower sheet conveyance path 44 is fed to the sheet alignment tray 50 in the post-processing apparatus main body 40 by the discharge roll pair 49 as shown in FIG. Discharged to the top. A paper discharge detection sensor 39 that detects the paper S is disposed immediately before the discharge roll pair 49. As shown in FIGS. 1 and 2, the sheet alignment tray 50 is disposed in the post-processing apparatus main body 40 along the conveyance direction of the sheet S in an inclined state with the leading end side in the conveyance direction facing upward. It is comprised from the attached flat member. A sheet bundle movement guide 55 that also serves as a reference fence for aligning the trailing edge of the sheet S is provided at the base end portion (lower end portion) of the sheet alignment tray 50. A total of two sheet bundle movement guides 55 are attached to a rotation belt 57 that is wound around a plurality of pulleys 56, each at a half-circumferential position. It can be rotated to a predetermined position. The sheet S placed on the sheet aligning tray 50 is inclined according to the inclination of the sheet aligning tray 50 by an aligning paddle 58 having a plurality of blades as sheet aligning means disposed below the discharge roll pair 49. The paper S is moved and aligned with the edge of the paper S in contact with the paper bundle movement guide 55. Further, the sheets S placed on the sheet alignment tray 50 are aligned by being pushed in the width direction from the left and right by the left and right alignment tampers 59. As shown in FIG. 5, the left and right alignment tampers 59 are arranged on different sides of a belt 62 that is stretched between a driving pulley 60 and a driven pulley 61 that are disposed at both ends in the width direction of the sheet aligning tray 50. The drive pulley 60 is rotationally driven by a drive motor 63 such as a stepping motor, so that the paper S moves in the direction of approaching or separating from each other along the directions of arrows A1 and A2. Alignment in the width direction is performed.
[0044]
The paper S aligned on the paper alignment tray 50 is subjected to post-processing by a post-processing means 51 that performs stapling processing and the like, as shown in FIG. The sheet is moved to the leading end side of the aligning tray 50 and is sandwiched between the sheet bundle discharging pinch roll 64 provided at the leading end portion of the sheet aligning tray 50 and the sheet bundle discharging roll 65 and is placed outside the post-processing apparatus main body 40. The paper is discharged onto the arranged stacking tray 54. The sheet bundle discharge pinch roll 64 is rotatable in the direction of arrow B about the fulcrum 66, and the sheet bundle 67 subjected to post-processing is moved to a predetermined position by the sheet bundle moving guide 55. The sheet bundle 67 is nipped with the sheet bundle discharge roll 65 via the sheet bundle movement guide 55 and the sheet bundle 67 is discharged onto the stacking tray 54 by the rotationally driven sheet bundle discharge roll 65. It is configured.
[0045]
By the way, in this embodiment, the sheet is moved to a position where the sheet above the sheet alignment tray can be held at a predetermined timing, and the sheet discharged on the sheet alignment tray is temporarily held by the sheet discharge unit, It is configured to include temporary holding means that moves to a position where the holding of the paper is released at the timing and stacks the temporarily held paper on the paper alignment tray.
[0046]
In the post-processing apparatus according to this embodiment, the temporary holding unit includes a paper holding position for holding paper according to the size in the width direction orthogonal to the conveyance direction of the paper discharged from the image forming apparatus. When the retraction position where the paper is not held and the reference position are set, and the mode that requires paper holding is selected, the temporary holding means moves to the retreat position and aligns the final paper of the previous paper bundle. Is controlled so as to move to the sheet holding position at a timing at which the first sheet of the next sheet bundle can be held.
[0047]
That is, as shown in FIG. 1, the post-processing apparatus according to this embodiment temporarily holds the paper S discharged onto the paper alignment tray 50 by the discharge roll pair 49 above the paper alignment tray 50. A pair of holding guides 70 are provided as holding means. As shown in FIG. 5, the pair of holding guides 70 are arranged on different sides of a belt 73 that is stretched between a driving pulley 71 and a driven pulley 72 that are disposed at both ends in the width direction of the sheet alignment tray 50. The drive pulley 71 is rotationally driven by a drive motor 74 made of a stepping motor, so that the drive pulley 71 can move in the direction of approaching or separating from each other along the arrow directions A1 and A2. Further, the position of the holding guide 70 is detected by the sensor 75, and as shown in FIG. 6, the holding of the sheet is performed according to the size in the width direction perpendicular to the conveying direction of the sheet S discharged from the image forming apparatus. It is possible to move to a paper holding position PH for carrying out, a retracting position PT for not holding paper, a holding paper alignment position PC ′ for carrying out alignment of the held paper, and a reference position (not shown). This reference position may be the same position as the retracted position PT, but may of course be set to another position.
[0048]
As shown in FIGS. 6 and 7, the pair of holding guides 70 have guide grooves 76 that hold both ends of the sheet S in a fitted state, and a base end portion 76 a of the guide groove 76. As shown in FIG. 5, the entrance side is formed in a tapered shape so that the paper S discharged from the discharge roll pair 49 can be surely introduced into the guide groove 76. As shown in FIGS. 1 and 6, the guide groove 76 is configured to be slightly curved upward rather than linearly, and the guide groove 76 is in a state where both ends of the paper S are fitted. When the sheet S is held, the sheet S is actively curved, and the sheet S is prevented from dropping from the guide groove 76 by utilizing the waist (rigidity) of the sheet S. In addition, as the shape of the guide groove 76, it may be formed so as to be curved downward, or may be formed so as to be curved in a wave shape. In addition, a rear end reference wall 77 that abuts the rear end of the sheet S held at both ends of the guide groove 76 is provided in a substantially L-shape at the base end portion of the guide groove 76. . Further, the guide groove 76 is configured to have a gap capable of holding a plurality of sheets S as required.
[0049]
Further, as shown in FIG. 1, sandwiching means 80 for sandwiching the leading ends of the aligned sheets S that are temporarily held by the holding guide 70 is disposed at the leading ends of the pair of holding guides 70. . As shown in FIG. 8, the clamping means 80 includes a flat upper clamping member 82 that is slidably attached to a guide rail 81 having a ball bearing and the like. The belt 83 as a means can reciprocate along the arrow C direction. Further, as shown in FIG. 1, the clamping means 80 is provided with a sensor 84 that detects the position of the upper clamping member 82, and the stepping motor M that drives the belt 83 based on the output of the sensor 84. By controlling the amount of rotation, the position can be moved according to the size of the paper S. The upper clamping member 82 is provided with an alignment wall 85 that can be aligned by abutting the leading edge of the sheet S. The leading edge 82 a of the upper clamping member 82 has the leading edge of the sheet S aligned with the alignment wall 85. It is bent slightly upward so as to guide it. The upper clamping member 82 has a lower clamping member 86 that clamps the leading end portion of the sheet S together with the upper clamping member 82 on the leading end side in the sheet transport direction from the alignment wall 85, with the fulcrum 87 as the center. A soft member 88 such as rubber is fixed to the tip of the lower clamping member 86 so as to be rotatable along the direction of arrow D. The lower holding member 86 can be rotated in the direction of the arrow by a driving means such as a solenoid (not shown), and the lower holding member 86 is moved in a state where the leading edge of the paper S is aligned with the alignment wall 85. The top end of the sheet S can be clamped together with the upper clamping member 82 by rotating upward.
[0050]
When the image forming apparatus selects and executes the mode for temporarily holding the alignment wall 85 of the clamping unit 80, as shown in FIG. When the paper discharge detection sensor 39 detects the trailing edge of the sheet that needs to be held and the predetermined time has elapsed after moving to the holding portion standby position PKT that maintains the leading end and the B dimension, the holding sheet alignment position PKC ′ is held from the holding standby position PKT. (Predetermined amount: moved by B dimension + α), and if there is a next holding sheet, it moves again to the holding position PKT. This operation is repeated every time the holding-needed sheet is discharged, and the holding sheet is aligned, and after moving to the holding sheet alignment position PKC ′ for aligning the final sheet of the holding sheet, nipping is performed at that position. It has become.
[0051]
In the configuration described above, the post-processing apparatus according to this embodiment has the following ease of jam removal without incurring an increase in cost and an increase in machine size, as well as for various sizes of paper. High productivity can be realized.
[0052]
That is, in the post-processing apparatus according to this embodiment, as shown in FIG. 2, the sheets S sequentially discharged from the image forming apparatus are conveyed along the sheet conveyance path 44, and a sheet alignment tray is formed by the discharge roll pair 49. 50 is discharged. The sheets S discharged onto the sheet alignment tray 50 are sequentially aligned by an alignment tamper 59 and an alignment paddle 58 as shown in FIG.
[0053]
By repeating the discharge operation of the sheet S by the discharge roll pair 49 and the alignment operation by the alignment tamper 59 and the alignment paddle 58, the sheet bundle 67 composed of a predetermined number of sheets S is aligned on the sheet alignment tray 50. Loaded with. Thereafter, the sheet bundle 67 aligned on the sheet alignment tray 50 is subjected to post-processing such as stapling by the post-processing unit 51. In the high-productivity post-processing apparatus according to the present embodiment, During the post-processing, the next sheet is continuously fed from the image forming apparatus.
[0054]
Then, in the high-productivity post-processing apparatus according to the present embodiment, as shown in FIG. 7, the holding guide 70 moves from the retracted position (PT) to the holding position (PH) and continuously from the image forming apparatus. The next set of sheets S to be sent is received. The paper S held by the holding guide 70 passes through the guide groove 76 and is once held by the holding guide 70 one after another while being held at both ends. At that time, the holding guide 70 moves between the holding position PH and the holding sheet alignment position PC ′, aligns the sheet S in the width direction, and moves the alignment wall 85 of the clamping means 80 in the E direction. The vertical alignment of the paper S is performed.
[0055]
During this time, the sheet bundle 67 on the sheet alignment tray 50 has been post-processed by the post-processing means 51, moved in the direction F by the sheet bundle moving guide 55, and discharged onto the stacking tray 54 by the sheet bundle discharge roll 65. Is done.
[0056]
Then, as shown in FIG. 1, the plurality of sheets S temporarily held in the guide groove 76 of the holding guide 70 is held in the retracted position PT with the holding guide 70 held in the state where the leading ends thereof are held by the holding means 80. , The holding state by the holding guide 70 is released, and the sheets are stacked on the sheet alignment tray 50 while being aligned. Thereafter, the clamping unit 80 releases the clamping state of the paper S.
[0057]
Thereafter, similarly to the first sheet bundle 67 described above, the sheets S are sequentially discharged onto the sheet alignment tray 50 by the discharge roll 49, and the sheet bundle 67 including a predetermined number of sheets S is aligned on the sheet alignment tray 50. The post-processing means 51 performs post-processing, and the same operation is performed thereafter.
[0058]
As described above, in the above-described embodiment, as shown in FIG. 1, the sheets S sequentially sent from the image forming apparatus are transported and aligned on the sheet alignment tray 50 of the post-processing apparatus. When post-processing is performed by the post-processing unit 51 in a state where the alignment of one set of paper bundles 67 has been completed, the size of the paper S to be subjected to image processing by the image forming apparatus, the image forming mode, or the post-processing mode Depending on the case, the first sheet S of the next set may be conveyed during the post-processing by the post-processing means 51. In particular, when the paper S is A4 size LEF (when transported with the short side direction of the paper being transported), the discharge interval of the paper S from the image forming apparatus is short, and the paper S is transported between sets. In the interval, the post-processing by the post-processing unit 51 may not end.
[0059]
In the above embodiment, as shown in FIG. 1, the sheet S discharged from the image forming apparatus is introduced into the post-processing apparatus main body 40 even during the post-processing by the post-processing means 51. ing. However, in the post-processing apparatus main body 40, post-processing by the post-processing means 51 on the paper aligning tray 50 or the discharge operation of the post-processed paper bundle 67 is performed. The next set of sheets S cannot be conveyed onto the sheet alignment tray 50 until 67 is discharged from the sheet alignment tray 50.
[0060]
Therefore, in the above embodiment, as shown in FIG. 1, the paper S discharged from the image forming apparatus is introduced into the post-processing apparatus main body 40 even during the post-processing by the post-processing unit 51. In addition, the sheet S is held in a temporary holding unit including a holding guide 70 disposed above the sheet aligning tray 50, and the holding guide is immediately after the sheet bundle 67 of the previous set is discharged from the sheet aligning tray 50. The sheet S temporarily held in the sheet 70 is stacked on the sheet alignment tray 50.
[0061]
Further, even when a jam occurs on the paper alignment tray 50, the upper portion of the paper alignment tray 50 is opened by moving the holding guide 70 to the standby position, and the jam removal operability is good.
[0062]
For this reason, in the above-described embodiment, the ease of jam removal is improved without causing an increase in cost and an increase in machine size, and high productivity can be realized for various sizes of paper. .
[0063]
Embodiment 2
9 and 10 show a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment. In the second embodiment, the temporary holding means is shown in FIG. However, it is configured to also serve as a width direction aligning unit that aligns the width direction orthogonal to the sheet conveyance direction.
[0064]
In the second embodiment, the temporary holding unit includes a retraction position where the paper is not held and aligned according to the size in the width direction orthogonal to the conveyance direction of the paper discharged from the image forming apparatus, and a paper alignment tray. When the alignment position for aligning the width direction of the paper, the paper holding position for holding the paper, and the reference position are set and a mode that requires paper holding is selected, the temporary holding means Before the first sheet is discharged from the discharge means, the sheet is moved to the retracted position, and the sequentially discharged sheets are aligned by reciprocating the alignment position and the sheet holding position, thereby aligning the final sheet of the sheet bundle. When the next sheet bundle exists after the process is completed, the sheet is controlled to move to the temporary holding position.
[0065]
Further, the second embodiment is configured to move the temporary holding means to the reference position when an unnecessary sheet is mixed in the temporary holding means.
[0066]
Furthermore, in the third embodiment, the holding position of the temporary holding means is set between the retracted position and the alignment position, and even if the temporary holding means is between the alignment position and the paper holding position, Is configured to be able to hold.
[0067]
That is, in the second embodiment, as shown in FIGS. 9 and 10, the alignment tamper 59 and the means for driving the tamper 59 are not provided, and the holding guide 70 as the temporary holding means is provided on the sheet. It is configured to also serve as an alignment means in the width direction of S. For this reason, a sheet aligning section 90 is provided at the lower end portion of the guide groove 76 of the holding guide 70 so as to contact the side surface of the sheet S stacked on the sheet aligning tray 50 and align the sheet S in the width direction. ing.
[0068]
In the post-processing apparatus according to this embodiment, as shown in FIG. 2, the sheets S sequentially discharged from the image forming apparatus are conveyed along the sheet conveyance path 44 and are placed on the sheet alignment tray 50 by the discharge roll pair 49. To be discharged. As shown in FIG. 10, the sheets S discharged onto the sheet alignment tray 50 are sequentially aligned by a holding guide 70 that also serves as an alignment tamper and an alignment paddle 58.
[0069]
At this time, the holding guide 70 also serving as the alignment tamper can be moved in the A1 and A2 directions by the belt driving by the stepping motor 70. A reference position of the holding guide 70 can be detected by the holding guide position detection sensor 75. When the mode for temporarily holding is selected and executed by the image forming apparatus, the size of each sheet S is set from the reference position. Accordingly, in FIG. 10, the sheet moves to the retreat position PT that keeps the dimension A, and after a predetermined time every time the sheet discharge detection sensor 39 detects the discharge of the sheet S, it moves to the alignment position PC and again to the retreat position PT. Return. This is repeated, and the sheets S are sequentially aligned. After the final sheet S of the sheet bundle 67 is moved to the alignment position PC for alignment, the sheet S stops between the alignment position PC and the holding position PH.
[0070]
The aligned sheet bundle 67 is post-processed by the post-processing unit 51. The next sheet fed from the image processing apparatus during post-processing is held by the alignment tamper / holding guide 70, and the held sheet S passes through the guide groove 76 and is temporarily held one after another while being held at both ends. To go.
[0071]
When the post-processing of the sheet bundle 67 on the sheet alignment tray 50 is completed during this time, the alignment tamper / holding guide 70 moves to the holding position PH as shown in FIG. And is discharged to the stacking tray 54 by the sheet bundle discharging means 64 and 65.
[0072]
When unnecessary paper is discharged into the guide groove 76 for some reason, all the temporarily held paper S is determined as unnecessary paper and moved to the reference position for paper removal.
[0073]
Thus, the structure of the apparatus can be further simplified by the holding guide 70 also serving as the alignment tamper.
[0074]
Embodiment 3
In the third embodiment, a holding sheet alignment position is set in which the temporary holding unit performs alignment in the width direction orthogonal to the sheet conveyance direction while the sheet is temporarily held, and the temporary holding unit is moved from the holding position. By moving to the holding paper alignment position, control is performed so that the holding paper is aligned.
[0075]
That is, in the third embodiment, in the operation of holding the paper that needs to be held, the holding guide 70 is set to the holding paper alignment position PC ′, and the paper S that needs to be held is placed in the paper discharge position. When a predetermined time detected by the detection sensor 39 elapses, the sheet is moved from the sheet holding position PH to the holding sheet alignment position PC ′. This operation is repeatedly performed each time holding-needed paper is discharged, and the holding paper is aligned, and control is performed so that the paper that does not need to be held moves to the retreat position PT before being discharged.
[0076]
Further, in the operation of holding the required holding sheet, the holding guide 70 or the alignment tamper / holding guide 70 is set to the holding sheet alignment position PC ′, and the position is fixed at the holding position PH. When a predetermined time elapses after the trailing edge of the last sheet that needs to be held is detected by the sheet discharge position detection sensor 39, the sheet moves from the sheet holding position PH to the holding sheet alignment position PC ′, and the holding sheet is aligned and held. Control is performed so that the sheet that does not need to be moved to the retreat position PT before being discharged.
[0077]
Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.
[0078]
【The invention's effect】
As described above, according to the present invention, the ease of jam removal is improved without increasing the cost and the machine size, and high productivity can be realized for various sizes of paper. Can be provided.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a main part of a post-processing apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a schematic configuration diagram showing a post-processing apparatus according to Embodiment 1 of the present invention.
FIG. 3 is a block diagram showing an image forming apparatus to which the post-processing apparatus according to Embodiment 1 of the present invention can be applied.
FIG. 4 is a configuration diagram illustrating a sheet reversing mechanism of the image forming apparatus.
FIG. 5 is a block diagram showing a mechanism for driving an alignment tamper and a holding guide of the post-processing apparatus according to Embodiment 1 of the present invention.
FIG. 6 is an explanatory view showing a holding guide of the post-processing apparatus according to Embodiment 1 of the present invention.
FIG. 7 is a block diagram showing a holding guide of the post-processing apparatus according to Embodiment 1 of the present invention.
FIG. 8 is a block diagram showing a clamping means.
FIG. 9 is a block diagram showing a main part of a post-processing apparatus according to Embodiment 2 of the present invention.
FIG. 10 is a block diagram showing a holding guide of a post-processing apparatus according to Embodiment 2 of the present invention.
[Explanation of symbols]
S: paper, 48: transport roll pair, 49: discharge roll pair, 50: paper alignment tray, 58: alignment paddle, 59: alignment tamper, 70: holding guide, 76: guide groove.

Claims (13)

  1. In a post-processing apparatus comprising post-processing means for performing predetermined post-processing on paper on which an image has been formed by the image forming apparatus, paper transport means for receiving and transporting a sheet discharged from the image forming apparatus, A sheet discharging unit that discharges the sheet conveyed by the sheet conveying unit onto the sheet alignment tray, a sheet alignment unit that aligns a plurality of sheets discharged onto the sheet alignment tray, and an alignment on the sheet alignment tray A post-processing unit that performs post-processing on the sheet bundle that has been moved to a position where the sheet can be held above the sheet alignment tray at a predetermined timing, and the sheet discharged to the sheet alignment tray by the sheet discharge unit is temporarily Bei holds, moved to a position for releasing the retention of the sheets at a predetermined timing, and a temporary holding means for stacking the temporarily holding the paper in the paper alignment on the tray, a ,
    The temporary holding unit includes a paper holding position for holding the paper according to the size in the width direction orthogonal to the conveyance direction of the paper discharged from the image forming apparatus, a retraction position for not holding the paper, and a reference position. Is set and a mode that requires paper holding is selected, the temporary holding means moves to the retracted position, does not disturb the alignment of the last paper of the previous paper bundle, and A post-processing apparatus controlled to move to a paper holding position at a timing at which the first sheet can be held .
  2. 2. The post-processing apparatus according to claim 1 , wherein the temporary holding unit also serves as a width-direction aligning unit that aligns a width direction orthogonal to a sheet conveyance direction.
  3. 3. The post-processing apparatus according to claim 2 , wherein the temporary holding unit includes a retreat position in which paper holding and alignment are not performed according to a size in a width direction orthogonal to a conveyance direction of the paper discharged from the image forming apparatus. When the alignment position for aligning the sheet width direction on the sheet alignment tray, the sheet holding position for holding the sheet, and the reference position are set, and the mode that requires sheet holding is selected, the temporary holding is performed. The means moves to the retracted position before the first sheet is ejected from the sheet ejecting means, aligns the sequentially ejected sheets by reciprocating the aligning position and the retracted position, and completes the final sheet of the sheet bundle After finishing the alignment, the post-processing device is controlled to move to the holding position when the next sheet bundle exists.
  4. 4. The post-processing apparatus according to claim 1 , wherein when the unnecessary paper is mixed in the temporary holding unit, the temporary holding unit is moved to a reference position. .
  5. 4. The post-processing apparatus according to claim 3 , wherein a holding position of the temporary holding unit is set between a retracted position and an alignment position, and the temporary holding unit is between the alignment position and the sheet holding position. And a post-processing apparatus configured to be capable of holding paper.
  6. In the post-processing device according to any one of claims 1, 2, 5, wherein the temporary storage means, with the sheet holding groove for holding the edges of the paper being formed, the sheet holding A post-processing apparatus, wherein a rear end reference wall for aligning rear ends in the longitudinal direction along the paper transport direction is provided at a rear end portion of the groove in the paper transport direction.
  7. 7. The post-processing apparatus according to claim 6 , wherein the temporary holding unit is set with a holding paper alignment position for performing alignment in the width direction orthogonal to the paper transport direction while temporarily holding the paper. A post-processing apparatus controlled to perform alignment of the holding paper by moving the holding means from the holding position to the holding paper alignment position.
  8. The post-processing apparatus according to claim 6 , further comprising a clamping unit that clamps a leading end portion of the sheet held by the temporary holding unit, the clamping unit being positioned above the discharge path of the sheet bundle. A post-processing device.
  9. 9. The post-processing apparatus according to claim 8 , wherein the holding means includes an upper holding member fixedly arranged, a lower holding member configured to be rotatable, and a rotating means, and is held by the temporary holding means. When all the sheets to be held are held, the lower holding member rotates to hold the sheet together with the upper holding member, and when the temporary holding means finishes the holding operation, it rotates in the reverse direction to release the holding of the sheet. A post-processing apparatus characterized by being configured to do so.
  10. 9. The post-processing apparatus according to claim 8 , wherein the holding means includes an alignment wall that aligns the leading end of the paper held by the temporary holding means, and a moving means that moves the holding means. A holding standby position corresponding to a vertical size along the conveyance direction of the paper held by the temporary holding unit, a standby position for retreating in a mode in which no paper holding is required, and a paper held by the holding unit When a mode that requires paper holding between a bundle of sheets is selected, the holding means is set from the paper discharge means. A post-processing apparatus controlled to move to a standby position before a sheet to be held is discharged.
  11. The post-processing apparatus according to claim 10 , wherein the holding position of the holding means is the length from the rear end reference wall provided in the temporary holding means to the alignment wall provided in the holding member through the guide groove. The alignment position of the clamping member is set so as to be larger than the size in the vertical direction along the sheet conveyance direction, and the alignment position of the clamping member is formed on the clamping unit through the guide groove from the rear end reference wall formed on the temporary holding unit. The post-processing apparatus is characterized in that the interval up to is set to be equal to or smaller than the vertical size of the paper.
  12. 12. The post-processing apparatus according to claim 10 , wherein the holding means repeats reciprocation from the standby position to the alignment position every time the temporarily held paper is discharged, and the final temporarily held paper is The post-processing device according to claim 1, wherein after the movement to the alignment position to be aligned, the clamping means is controlled to perform a clamping operation at the alignment position of the holding paper.
  13. 13. The post-processing apparatus according to claim 7 , wherein the holding means moves to a retracted position after the temporary holding means determines a position at a holding paper alignment position where a final sheet of paper that needs to be temporarily held is aligned. A post-processing device characterized in that clamping is performed before.
JP2001171147A 2001-06-06 2001-06-06 Post-processing equipment Expired - Fee Related JP3890922B2 (en)

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JP4681405B2 (en) * 2005-09-15 2011-05-11 東芝テック株式会社 Sheet post-processing device
JP4627707B2 (en) * 2005-09-15 2011-02-09 東芝テック株式会社 Paper sheet processing equipment
JP4627706B2 (en) * 2005-09-15 2011-02-09 東芝テック株式会社 Paper sheet processing apparatus and paper sheet processing method
US8020857B2 (en) 2005-09-15 2011-09-20 Toshiba Tec Kabushiki Kaisha Paper sheet processing apparatus, and paper sheet processing method
JP2007076895A (en) * 2005-09-16 2007-03-29 Toshiba Tec Corp Sheet post-treatment device
JP2007084253A (en) * 2005-09-21 2007-04-05 Toshiba Tec Corp Sheet treatment device
JP4746950B2 (en) * 2005-09-21 2011-08-10 東芝テック株式会社 Sheet processing apparatus and sheet processing method
JP2007084252A (en) * 2005-09-21 2007-04-05 Toshiba Tec Corp Sheet treatment device
JP2007168965A (en) 2005-12-21 2007-07-05 Toshiba Tec Corp Paper postprocessor
JP4657911B2 (en) * 2005-12-26 2011-03-23 東芝テック株式会社 Paper post-processing apparatus and paper post-processing method
JP4495080B2 (en) * 2005-12-26 2010-06-30 東芝テック株式会社 Paper post-processing device
JP4948838B2 (en) * 2006-01-17 2012-06-06 東芝テック株式会社 Paper post-processing device
JP2007269429A (en) * 2006-03-30 2007-10-18 Toshiba Tec Corp Paper post-treatment device
JP2007308215A (en) * 2006-05-16 2007-11-29 Toshiba Tec Corp Paper post-processing device
JP2008247598A (en) * 2007-03-30 2008-10-16 Ricoh Elemex Corp Paper sheet post-treatment device
JP4888909B2 (en) * 2007-12-17 2012-02-29 東芝テック株式会社 Paper processing device
US7862024B2 (en) 2007-12-27 2011-01-04 Kabushiki Kaisha Toshiba Sheet finisher, image forming apparatus, and sheet finishing method
JP5978740B2 (en) * 2012-04-26 2016-08-24 コニカミノルタ株式会社 Intermediate transport unit and image forming system having the same
JP6128098B2 (en) * 2014-11-05 2017-05-17 コニカミノルタ株式会社 Post-processing apparatus and image forming system

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