JP2010083635A - Sheet postprocessing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet postprocessing device having a streaking mechanism superior in straightness, capable of surely streaking in a desired position of a sheet, and capable of surely streaking in a straight line shape. <P>SOLUTION: A streaking means is constituted of a first streaking member for forming a projection part extended to the other end side from one end side of the sheet, a second streaking member having a recessed part extended in a circular arc shape toward the other end side from one end side of the sheet, and a pressing means for pressing the second streaking member to the first streaking member side. Streaking is applied by successively fitting the circular arc-shaped recessed part of the second streaking member to the projection part of the first streaking member by moving a pressing position of the second streaking member by the pressing means toward the other end side from one end side of the sheet. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet post-processing apparatus that folds a sheet in advance before folding or Z-folding the sheet, and more particularly, to a creasing mechanism for providing a straight line at a predetermined position of a sheet.

  2. Description of the Related Art Conventional sheet post-processing apparatuses are known that include a stapling mechanism that performs a binding process on a predetermined portion of a sheet and a folding mechanism that performs a folding process such as folding a sheet into two and Z-folding.

  In the sheet post-processing apparatus provided with the above-described folding mechanism, a streak-like crease is added to the sheet before the sheet is folded so that the sheet is reliably folded at a predetermined position when the folding process is performed. Some have a creasing mechanism for assisting the folding process. Such a creasing mechanism is particularly effective for thick paper and film paper that are difficult to bend, and there is also known a creasing mechanism that performs creasing only on the cover of a sheet post-processing apparatus having a bookbinding function for bookbinding.

  The conventional scoring mechanism includes a scoring plate whose tip is formed in a blade shape and a scoring block in which a V-shaped groove is formed, and the blade-shaped tip of the scoring plate and the scoring block It is known that a sheet is sandwiched between a scoring plate and a scoring block by moving one of the scoring plate and the scoring block so that the V-shaped groove is engaged, and the sheet is creasing. (For example, Patent Document 1). In addition, the outer periphery is provided with a rotating body formed in a blade shape and a creasing base that supports the sheet, and the rotating body crates the sheet by rotating while pressing the sheet supported by the creasing base. (For example, Patent Document 2) is also known.

JP 2000-301851 A JP 2008-105316 A

  However, in the former scoring mechanism using the scoring plate and the scoring block, the front end portion of the long scoring plate is simultaneously pressed against the sheet surface, so that the pressing force is dispersed. Therefore, sufficient creasing cannot be performed and the sheet cannot be folded at a desired position when the sheet is folded by the folding mechanism. Further, the folded sheet is easily opened without being sufficiently bent.

  In addition, in the creasing mechanism composed of the rotator and the creasing base, when the rotator is moved from the outside of the end of the sheet onto the sheet, the end of the sheet is lifted or the end of the sheet is curled. The rotating body cannot move on the sheet when it is deformed into a shape. Therefore, since the rotating body moves onto the sheet while pushing the end of the sheet, a problem arises in that the sheet is displaced and the scoring is not performed at a predetermined position. Further, there is a problem that the rotating body is easy to move in a meandering manner due to an axial backlash or mounting tolerance, and a straight line cannot be surely formed.

  The present invention has been made in view of the above-described problems, and is capable of reliably performing creasing at a desired position of the sheet, and is excellent in straightness capable of surely performing linear creasing. It is an object of the present invention to provide a sheet post-processing apparatus having a creasing mechanism.

  In order to achieve the above object, the present invention provides a first creasing member in which a convex portion extending from one end side to the other end side of the sheet is formed, and from one end side to the other end side of the sheet. A creasing means is constituted by a second creasing member having a concave portion extending in an arc shape and a pressing means for pressing the second creasing member toward the first creasing member, and the pressing means The pressing position of the second creasing member is moved from one end side to the other end side of the sheet, and the arc-shaped concave portion of the second creasing member is sequentially fitted to the convex portion of the first creasing member. The creasing was made to match.

  Since the concave portion of the arc-shaped second creasing member swings while moving the fitting position with respect to the convex portion of the first creasing member, the creasing is reliably performed with a small pressing force. In addition, since the creasing member and the pressing member are provided separately, the straightness of the creasing member is improved, and the straight streak is applied without meandering. .

    The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is an overall view of an image forming system including an image forming apparatus A and a sheet post-processing apparatus B.

  The image forming system shown in FIG. 1 reads an original image, prints the read image on a sheet, and after the sheet that performs post-processing such as stapling and folding on the sheet transported from the apparatus A And processing apparatus B.

  The image forming apparatus A is provided with a plurality of cassettes 4 for storing sheets, an electrostatic drum 6, and a fixing device 9. The electrostatic drum 6 forms an electrostatic latent image on the drum, a toner ink is attached to the latent image by the developing device 7, and printing is performed on a sheet by the transfer charger 8. That is, an image is printed on the surface of the sheet fed from the selected cassette by the electrostatic drum 6 and is fixed by the fixing device 9.

  Reference numeral 2 in the figure is a document reading device that reads a document image placed on the transparent platen 11 with a CCD device or the like. Reference numeral 3 is a document that automatically feeds a document sheet onto the platen 11. It is a feeding device. In this apparatus, an electrostatic latent image is formed on the electrostatic drum 6 based on the original image data read by the original reading device 2, and the original image is copied on a sheet.

  Next, the sheet post-processing apparatus B will be described. As shown in FIG. 1, the sheet post-processing apparatus B performs end-stitching processing on the end portion of the sheet and performs saddle stitching on the substantially center of the sheet. A folding processing unit 30 is provided that folds the booklet to create a booklet. The sheet sent from the image forming apparatus A to the carry-in path PA1 of the sheet post-processing apparatus B is conveyed to the staple processing unit 20 from the first conveyance path PA2 when the staple mode is selected by the operator, and the folding mode is set. When selected, the sheet is conveyed from the second conveyance path PA3 to the folding processing unit 30.

  In the staple processing unit 20, a processing tray 21 for processing sheets, a staple unit 22 for binding the end of the sheet on the processing tray 21, and a sheet are discharged to the processing tray 21. A pair of discharge rollers 23 and a switchback that allows the sheet discharged onto the processing tray 21 to move to the staple position on the stapling apparatus side, and discharges the end-stitched sheet to the discharge tray, which can be rotated forward and backward, and can be raised and lowered. And a roller 24.

  Then, the sheet guided from the carry-in route PA1 to the first transport route PA2 by the route switching flapper 12 is discharged onto the processing tray 21 by the discharge roller pair 23. When the sheet is discharged onto the processing tray 21, the switchback roller 24 is lowered to contact the sheet, and the sheet is moved to the staple unit 21 side. The switchback roller 24 stops and rises when the end of the sheet reaches the stapling position. In this way, when a predetermined number of sheets are discharged onto the processing tray 21 and positioned at the staple position, the staple unit 22 operates to perform the binding process on the end of the sheet bundle. When the binding process is completed, the switchback roller 24 is lowered again and the sheet bundle subjected to the binding process is conveyed by being sandwiched between the switchback roller 24 and the driven roller 25 and discharged onto the discharge tray 26.

  Next, the folding processing unit 30 will be described. The folding processing unit 30 includes a folding tray 31 for performing folding processing, a staple unit 32 for saddle stitching for performing binding processing at substantially the center in the sheet conveyance direction, and a sheet. A folding blade 33 and a folding roller pair 34 are disposed for folding the sheet. Further, the folding processing unit 30 is provided with a creasing unit 40 for making a streak-like crease in the sheet so that the sheet can be easily folded.

  Then, the sheet guided from the carry-in route PA1 to the second transport route PA3 by the route switching flapper 12 stops when the center position in the transport direction reaches the creasing processing position of the creasing unit 40. Then, after a creasing process is performed by the creasing unit 40, the sheet is conveyed again and discharged to the folding tray 31 by the conveying roller pair 35. The discharged sheet falls due to its own weight and abuts against the stopper 37 to be aligned. After that, the lined subsequent sheets are sequentially discharged to the folding tray 31, and when a predetermined number of sheets are discharged onto the tray 31, the stopper 37 is moved upward in the drawing. Accordingly, the sheet bundle on the folding tray 31 moves upward, and when the center binding position in the sheet conveyance direction of the sheet bundle, that is, the same position as the scoring position reaches the saddle stitching staple unit 32. The stopper 37 stops. At this time, the flapper 36 provided in the vicinity of the discharge port by the conveyance roller pair 35 has moved to a position that closes the discharge port by the conveyance roller pair 35, and the upstream end portion (in the drawing) of the sheet bundle on the folding tray. The upper end of the sheet bundle in FIG. 2 moves over the flapper 36 along the folded mounting surface of the folding tray.

  Then, when the saddle stitching staple unit 32 is operated and the saddle stitching staple unit 32 performs the binding process at the same position as the creasing position, the stopper 37 moves downward in the drawing. As a result, the sheet bundle subjected to the binding process moves, and the stopper 37 stops when the binding position of the sheet bundle reaches the position of the folding blade 33. When the stopper 37 stops, the folding blade 33 moves to the folding roller pair 34 side, and by this movement, the leading end of the folding blade 33 comes into contact with the sheet scoring position, and the sheet bundle is deformed into a mountain shape. The central portion of the sheet bundle is pushed into the nip portion. The sheet bundle is conveyed while being pressed by the folding roller 34 and is folded into a booklet. The bundled sheet bundle is discharged and stacked in the storage unit 39 by the sheet bundle discharge roller pair 38.

  Note that the sheet post-processing apparatus of the present embodiment is provided with a supply unit 47 that supplies a sheet to be a cover of a booklet when the sheet is folded in half to create a booklet.

  Here, the scoring unit according to the present invention will be described. FIG. 2 is a sectional view of the creasing unit, and FIGS. 3A and 3B are schematic sectional views for explaining the creasing operation.

  The creasing unit 40 includes a fixed unit 41 and a moving unit 42. The fixed unit 41 is provided with a pedestal (first creasing member) 51 attached to the base 50 and a creasing plate 52 protruding from the mounting surface of the pedestal 51. The moving unit 42 is formed with a creasing groove 61a into which the creasing plate 52 is fitted, and a rocking member (second creasing member) 61 for creasing the sheet in cooperation with the creasing plate 52. A pressing roller 62 that presses the swing member 61 against the base 51 and a bracket 63 to which the pressing roller 62 is attached are provided inside the box-shaped frame 60.

  As shown in FIG. 2, the bracket 63 to which the pressing roller 62 is attached is a resin fitted in openings 60 b (60 a) respectively opened on opposite side surfaces of a box-shaped frame 60 that forms the base of the moving unit 42. The rotary members 66a and 66b (65a and 65b) are configured to move in parallel along the openings 60b (60a) on both side surfaces of the frame 60.

  The contact surface of the swinging member 61 that contacts the pedestal 51 is formed in an arc shape in the sheet width direction orthogonal to the sheet conveyance direction, and the scoring groove 61a also extends in the sheet width direction along the arc-shaped contact surface. Is formed.

  When the bracket 63 is moved as shown in FIGS. 3A and 3B, the pressing roller 62 is also moved. Along with this, the position of pressing the back surface of the swinging member 61 of the pressing roller 62 moves. As a result, the swinging member 61 swings and the creasing groove 61 a corresponding to the pressing position of the pressing roller 62 is fitted to the creasing plate 52, and the sheet is placed between the creasing groove 61 a and the creasing plate 52. The straight streak is formed on the sheet.

  FIG. 4 is an enlarged cross-sectional view showing a state in which the sheet is sandwiched between the creasing groove 61a and the creasing plate 52 and the sheet is creasing.

  As described above, the sheet is sequentially sandwiched between the contact surface of the swinging member 61 and the scoring groove 61a and the mounting surface of the base 51 and the scoring plate 52 by the movement of the pressing roller 62, and the sandwiched sheet. As shown in FIG. 4, it is deformed into a concavo-convex shape so that creasing is made.

  As described above, in the present embodiment, the creasing mechanism includes the fixed base 51 and the scoring plate 52, the swinging member 61 having the scoring groove 61a, and the swinging member 61 by pressurizing the base 51. In addition, since the sheet is sandwiched between the creasing plate 52 and the swinging member 61 and the pressing roller 62 performs creasing, a straight line without meandering can be applied to the sheet.

  The creasing unit 40 in the present embodiment has a creasing plate on the side facing the outer surface (front surface) of the sheet so that concave streaks are formed on the outer side (front side) of the sheet when the sheet is folded. A pedestal 51 provided with 52 is disposed, and an arcuate swinging member 61 having a creasing groove 61a is disposed on the side facing the inner side surface of the seat.

  Thereby, when the sheet is bent, it is possible to prevent the sheet fiber of the bent portion on the outer side surface of the sheet from being torn and cracked. In particular, there is a colored coated sheet on the surface of the sheet used as the cover of the booklet, the colored coating can be prevented from cracking due to folding, and the appearance of the booklet can be satisfactorily finished.

  Further, as shown in FIG. 2, the moving unit 42 is engaged with racks 53 a and 53 b provided on the fixed unit 41, and moves the moving unit 42 in a direction in which the moving unit 42 is separated from and attached to the base 51 of the fixed unit 41. , 64b are provided. With this configuration, when the sheet is carried into the creasing unit 40 and when the sheet is carried out from the creasing unit 40, the moving unit 42 is moved away from the pedestal 51 to retract the swinging member 61 from the sheet conveyance path. During the creasing operation, the moving unit 42 is moved to a position where the swinging member 61 contacts the sheet placement surface of the pedestal 51.

  4 is an urging spring that urges the conveyance guide 71 provided in front of the creasing plate 52 in the sheet conveyance direction toward the inside of the conveyance path. The conveyance guide 71 is configured to be rotatable with a support shaft 71a at one end thereof as a fulcrum, and when the swinging member 61 is in a position retracted from the sheet conveyance path, the creasing plate 52 is acted upon by the biasing spring 70. When the swinging member 61 is in a position where the swinging member 61 is in contact with the sheet placement surface of the pedestal 51, the surface of the pedestal 51 is formed in a position parallel to the placement surface of the pedestal 51. It is supposed to move. As a result, the sheet carried into the scoring unit 40 is guided along the transport guide 70 protruding into the transport path, and the leading end of the sheet does not contact the scoring plate 52 but passes the scoring plate 52 downstream. Led to.

  Next, a first moving mechanism for moving the moving unit 42 and a second moving mechanism for moving the pressing roller 62 will be described. FIG. 5 is a side view showing one side surface of the moving unit 42, and FIG. 6 is a side view showing the other side surface of the moving unit 42.

  First, the first moving mechanism includes a first drive motor M1 for driving the above-described pinions 64a and 64b shown in FIG. The first drive motor M1 is transmitted from the timing belt T1 spanned between the first pulley P1 and the second pulley P2 to the first gear Z1 and the second gear Z2. The rotation shaft S1 of the second gear Z2 is stretched from one side surface to the other side surface of the frame 60, and the first pinion 64a is attached to the substantially central portion of the rotation shaft S1 of the second gear Z2. As a result, the drive of the first drive motor M1 is transmitted to the first pinion 64a. Further, a third pulley P3 is attached to the other end of the rotation shaft S1 of the second gear Z2, and a timing belt T2 is stretched between the third pulley P3 and the fourth pulley P4. The fourth pulley P4 is connected to the fourth gear Z4 via the third gear Z3. The rotation axis S2 of the fourth gear Z4 is stretched over one side surface of the frame 60, and a second pinion 64b is attached to the approximate center thereof. That is, the drive of the rotating shaft S1 to which the first pinion 64a is attached is transmitted to the second pinion 64b via the timing belt T2, and rotates in synchronization with the first pinion 64a and the second pinion 64b. Thereby, the moving unit 42 can move without being inclined in the sheet width direction.

  Next, the second moving mechanism will be described. The second moving mechanism is driven using the second drive motor M2 shown in FIG. 5 as a drive source. The drive motor M2 is transmitted from the third timing belt T10 to the large-diameter sixth gear Z11 via the fifth gear Z10. A fifth pulley P10 is attached to the rotation shaft S3 of the sixth gear Z11, and a fourth timing belt T11 is stretched between the fifth pulley P10 and the sixth pulley P11. A bracket 63 is connected to the fourth timing belt T11 by a first connecting member 68. As a result, the bracket 63 to which the pressing roller 62 is attached reciprocates in the sheet width direction as the fourth timing belt T11 rotates. Further, the rotation shaft S3 of the sixth gear Z11 is stretched over the other side of the frame 60, and a seventh pulley P12 is attached to the end of the rotation shaft S3 on the other side as shown in FIG. Yes. The fifth timing belt T12 is stretched between the seventh pulley P12 and the eighth pulley P13, and the bracket 63 is connected to the fifth timing belt T12 by the second connecting member 69. That is, the drive of the second drive motor M2 is transmitted to the fourth and fifth timing belts T11 and T12 stretched along both side surfaces of the frame 60, and the fourth and fifth timing belts T11 and T12 are synchronized. Then, the bracket 63 and the pressing roller 62 move by rotating.

  The bracket 63 is supported by two shafts, a shaft 67a to which the first rotating member 65a and the third rotating member 66a are attached, and a shaft 67b to which the second rotating member 65b and the fourth rotating member 66b are attached. Has been. Further, as shown in FIG. 5, the first connecting member 68 is attached to one end side of the two shafts 67a and 67b, and the first connecting member 68 has a fourth timing by sandwiching the fourth timing belt T11. As shown in FIG. 6, the second connecting member 69 is attached to the other end of the two shafts 67a and 67b, and the second connecting member 69 is also connected to the first connecting member 68. Similarly, it is fixedly connected to the fifth timing belt T12 with the fifth timing belt T12 interposed therebetween.

  That is, in the above-described configuration, the fourth and fifth timing belts T11 and T12 rotate in synchronization with the driving motor M2, and the first and second timing belts T11 and T12 rotate to rotate the first and second timing belts. The rotating members 65a and 65b and the third and fourth rotating members 66a and 66b move with the opening edge of the opening 66a on one side of the frame 60 and the opening 66b on the other side as a rail. As a result, the bracket 63 and the pressing roller 62 reciprocate in the sheet width direction, and the rocking member 61 is swung to perform creasing.

  FIG. 7 is an operation flowchart showing a creasing operation by the creasing unit. 8 is a movement process of the moving unit 42 in the creasing operation, FIG. 9 is a creasing process for moving the pressing roller 62 in the creasing operation, FIG. 10 is a retracting process of the moving unit 42 in the creasing operation, and FIG. It is a control flowchart figure which each shows the home position creasing process which returns a press roller to a home position in a creasing action.

  The scoring operation will be described with reference to FIGS. 7 to 11. The creasing operation is set after the leading edge of the sheet guided to the second conveyance path PA3 by the path switching flapper 12 is detected by the sheet detection sensor 48 shown in FIG. When the sheet is conveyed by the conveyance amount, the upstream conveying roller pair 45 and the downstream conveying roller pair 35 of the creasing unit 40 are stopped, and the sheet is positioned at the creasing processing position. It should be noted that a value corresponding to the size of the sheet is sequentially updated and set based on the sheet size information. Further, the sheet conveyance amount can be easily detected by measuring drive pulses of a drive motor (not shown) that drives the conveyance roller pairs 35 and 45 and reaching the number of pulses corresponding to the set conveyance amount. .

  When the sheet is positioned at the creasing process position, first, a moving process is performed in which the swinging member 61 at the standby position is moved to the actuating position for creasing (ST2). In this swing member moving process, as shown in FIG. 8, the first drive motor M1 is rotated forward to move the moving unit 42 toward the pedestal 51, and the operating position sensor 80 provided on the fixed unit 41 is moved to the moving unit 42. When the detection flag 81 is detected, the first drive motor M1 is stopped (ST20 to ST22) (see FIG. 2). As a result, the swing member 61 is pressed against the mounting surface of the base 51. At this time, the pressing roller 52 is located at the home position on the one end portion side of the swing member 61, and the swing member 61 is in a state of being abutted from one end toward the other end.

  When the fixed unit 41 reaches the operating position, a creasing process is performed in which the rocking member 61 is swung to crunch the sheet (ST3). In this scoring process, when the second drive motor M2 is driven to rotate forward and the pressing roller 52 moves the set amount of movement, the second drive motor M2 is stopped (ST30 to ST32). As a result, the pressing roller moves in the width direction of the sheet, the groove 61a of the swinging member 61 and the leading end of the creasing plate 52 are sequentially fitted, and the sheet is sandwiched and creasing is performed. The amount of movement of the pressing roller 52 is set to the number of pulses corresponding to the moving distance according to the sheet size (length in the width direction of the sheet), and the second drive motor M2 is driven by the number of pulses and stopped.

  Subsequently, in order to move the swinging member 61 that has finished the creasing operation to the retracted position, a retracting process for retracting the moving unit 42 is executed (ST4). In this process, the first drive motor M1 is reversed, and the first drive motor M1 is stopped when the moving unit 42 moves in a direction away from the base 51 by a certain amount. As a result, the swing member 61 is retracted from the conveyance path, and the sheet can be carried out and carried in.

  Finally, an initial position return process for returning the pressing roller 52 to the home position, which is the initial position, is executed (ST5). Here, if the second drive motor M2 is reversely rotated and the home position sensor 82 provided on one side of the frame 60 detects the detection flag 83 provided on the first connecting member 68 connected to the fourth timing belt T11. The second drive motor M2 is stopped (ST50 to ST52) (see FIG. 5). As a result, the pressing roller 52 moves to the home position on the one end side of the swinging member 61 and stands by in preparation for the next creasing operation.

  Then, the sheet that has been scored by the creasing operation in the creasing unit 40 is discharged to the folding tray 31, and staple processing and folding processing are executed on the discharged sheet.

  In the present embodiment, a pedestal 51 provided with a scoring plate 52 is disposed on the side facing the outer surface (front surface) of the sheet when the sheet is folded, and the streak is disposed on the side facing the inner surface of the sheet. Although the arcuate swing member 61 having the attachment groove 61a is disposed, the placement of the pedestal and the swing member may be reversed and the creasing may be performed. In other words, an arcuate rocking member having a scoring groove is disposed on the side facing the outer surface (front surface) of the seat, and a pedestal provided with a scoring plate is disposed on the side facing the inner surface of the seat. Also good.

  In the present embodiment, the above-described creasing operation is performed only on a thick sheet used for a cover such as a booklet supplied from the supply device 47, but the thick sheet guided to the second transport path PA3. It is also possible to execute the process for all of the sheets guided by the second transport path PA3 regardless of the thickness of the sheet.

  Further, in the present embodiment, the creasing unit 40 is arranged in the second conveyance path PA3. However, if creasing is performed only on the sheet of the supply device 47, the creasing unit 40 may be arranged in the supply path PA4 shown in FIG. Good. If only a specific sheet such as a cover or cardboard is to be provided, an individual path PA5 for executing only the alignment is provided as shown in FIG. 12, and the creasing unit 40 is arranged in this path. Also good. By arranging the creasing unit 40 in the supply path PA4 shown in FIG. 2 or the individual path PA5 shown in FIG. 12, the creasing operation can be performed while sheets other than the creasing sheet are discharged to the folding tray. Processing efficiency can be improved.

  According to the above embodiment, since the member for performing creasing (swing member 61) and the member for pressing (pressing roller 62) are provided separately, the straightness of the member for performing creasing has been improved. Further, since the swinging member 61 is swung by bringing the mounting surface of the base 51 and the contact surface of the swinging member 61 into contact with each other, the swinging member 61 is swung stably. Straight lines are applied without meandering.

  Further, according to the above embodiment, the outer side when the sheet is bent is pressed by the creasing plate 62, so that the sheet is not cracked.

  According to the above embodiment, the arc-shaped swinging member 61 is configured to swing on the pedestal 51 and perform creasing while moving the contact position of the pedestal 51 with respect to the sheet placement surface. Streaks can be reliably applied with the pressing force.

1 is a cross-sectional view illustrating an entire image forming system. It is sectional drawing which shows the creasing mechanism of this invention. It is explanatory drawing for demonstrating the creasing operation | movement of the creasing mechanism of this invention. It is a state figure showing the creasing state of the creasing mechanism of the present invention. It is a side view which shows one side of the movement unit of the creasing mechanism of this invention. It is a side view which shows the other side of a movement unit. It is an operation | movement flowchart figure which shows the creasing operation | movement by the creasing mechanism of this invention. It is a flowchart figure which shows the movement process of the movement unit in a creasing operation | movement. It is a flowchart figure which shows the creasing process in a creasing operation | movement. It is a flowchart figure which shows the evacuation process of the movement unit in a creasing operation | movement. It is a flowchart figure which shows the return process to a home position in a creasing operation | movement. It is a block diagram of the sheet | seat post-processing apparatus which shows the structure of the other Example of this invention.

Explanation of symbols

A Image forming apparatus B Sheet post-processing device 20 Staple processing unit 30 Folding processing unit 31 Folding tray 32 Staple unit 33 Folding blade 34 Folding roller pair 40 Streaking unit 41 Lower unit 42 Upper unit 50 Base 51 Base (first streak) Attaching material)
52 crease plate 60 frame 61 swing member (second crease member)
61a Bracing groove 62 Pressing roller 63 Bracket

Claims (6)

In a sheet post-processing apparatus comprising: a conveying unit that conveys a sheet to a predetermined position; and a creasing unit that lines the predetermined position of the sheet conveyed by the sheet conveying unit.
The creasing means includes a first creasing member formed with a protrusion extending from one end side to the other end side of the sheet, and an arc extending from one end side to the other end side of the sheet. A second creasing member having a provided recess, and pressing means for pressing the second creasing member toward the first creasing member,
The pressing means moves the pressing position of the second scoring member from one end side to the other end side of the sheet so that the arc-shaped recess of the second scoring member protrudes from the first scoring member. The sheet post-processing apparatus, wherein the second creasing member is swung so as to be sequentially fitted to the portion. In a sheet post-processing apparatus comprising: a conveying unit that conveys a sheet to a predetermined position; and a creasing unit that applies a line-like crease at the predetermined position to the sheet conveyed by the sheet conveying unit.
The creasing means includes a first creasing member having a recess extending from one end side to the other end side of the sheet, and an arc extending from one end side to the other end side of the sheet. A second creasing member having a projected portion, and a pressing means for pressing the second creasing member toward the first creasing member,
The pressing means moves the pressing position of the second scoring member from one end side to the other end side of the sheet, and the arc-shaped convex portion of the second scoring member is the first scoring member. The sheet post-processing apparatus, wherein the second creasing member is swung so as to be sequentially fitted to the recess. The pressing means abuts against a part of the back side of the second crease member that is different from the first crease member side and presses the second crease member toward the first crease member. 3. The sheet post-processing apparatus according to claim 1, further comprising: a pressing member that moves and a movement mechanism that moves the pressing member substantially in parallel from one end side to the other end side of the sheet. A creasing unit in which the second creasing member, the pressing member, and the moving mechanism are integrated, and a separation mechanism for moving the creasing unit in the separation direction with respect to the first creasing member are provided. The sheet post-processing apparatus according to claim 3. The first creasing member has a flat mounting surface that supports the sheet, and the second creasing member has a contact surface that contacts the mounting surface of the first creasing member. The sheet post-processing apparatus according to claim 3. The first creasing member is arranged on the surface side that is the outer side of the sheet that is folded along the lines formed by the creasing means, and the second muscle is disposed on the surface side that is the inner side of the folded sheet. The sheet post-processing apparatus according to claim 3, wherein an attaching member is disposed.