JP5561139B2 - Paper post-processing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet post-processing apparatus and an image forming apparatus.

  2. Description of the Related Art Conventionally, after a plurality of sheets on which images are formed are aligned and stacked to obtain a sheet bundle, the sheet bundle is bound (saddle-stitched) or folded (center-folded) at the center in the conveying direction. Are known (for example, Patent Documents 1 and 2).

JP 2003-182928 A JP 2006-56713 A

  However, in the sheet post-processing apparatus disclosed in Patent Document 1, saddle stitching and center folding are both performed in a state where the sheet bundle is flat, and there is a possibility that the apparatus is liable to be enlarged. Further, in the paper post-processing apparatus disclosed in Patent Document 2, since the sheet bundle is aligned in a curved state, there is a possibility that inconveniences such as the accuracy of alignment of the sheet bundle tend to be lowered may occur.

  Therefore, an object of the present invention is to obtain a sheet post-processing apparatus and an image forming apparatus that can be configured more compactly while suppressing a decrease in accuracy of each processing on a sheet.

In the sheet post-processing apparatus according to the present invention, an alignment unit that stacks and aligns a plurality of sheets in a flat posture, a conveyance mechanism that conveys a sheet bundle of the plurality of sheets aligned in the alignment unit, and the conveyance mechanism The sheet bundle conveyed by the guide section having a curved surface that bends along, the roller pair that is provided facing the guide section and that bends the sheet bundle so as to be bent, and the curved section is bent along the curved surface. A guiding mechanism for guiding the sheet bundle toward the roller pair, wherein the first part moves the first part closer to the aligning unit from the center in the conveyance direction of the sheet bundle toward the roller pair. A guide mechanism having a mechanism and a second moving mechanism that moves a second portion opposite to the first portion with respect to a central portion in the conveyance direction of the sheet bundle toward the roller pair ; , With this It is referred to as one of the features.

  According to the present invention, it is possible to obtain a sheet post-processing apparatus and an image forming apparatus that can be configured more compactly while suppressing a decrease in accuracy of each processing on a sheet.

FIG. 1 is a side view showing a schematic configuration of a sheet post-processing apparatus according to an embodiment of the present invention. FIG. 2 is a side view showing a schematic configuration of the saddle stitching stapler of the sheet post-processing apparatus according to the embodiment of the present invention. FIG. 3 is a plan view showing a schematic configuration of the saddle stitching stapler and the crease forming mechanism according to the embodiment of the present invention. FIG. 4 is a side view showing the configuration and operation of the folding mechanism of the sheet post-processing apparatus according to the embodiment of the present invention, and shows a state before the sheet bundle is bent. FIG. 5 is a side view showing the configuration and operation of the folding mechanism of the sheet post-processing apparatus according to the embodiment of the present invention, and is a diagram showing a state where the sheet bundle is bent. FIG. 6 is a side view showing a configuration and operation of a modified example of the guide mechanism of the sheet post-processing apparatus according to the embodiment of the present invention, and is a view showing a state before the sheet bundle is bent. FIG. 7 is a side view showing the configuration and operation of a modified example of the guide mechanism of the sheet post-processing apparatus according to the embodiment of the present invention, and is a view showing a state where the sheet bundle is bent. FIG. 8 is a side view illustrating an example of the configuration and operation of the guide unit, the movable member, and the guide member of the sheet post-processing apparatus according to the embodiment of the present invention. FIG. 9 is a perspective view illustrating configurations of the guide unit, the movable member, and the roller of the sheet post-processing apparatus according to the embodiment of the present invention. FIG. 10 is a diagram showing an arrow A in FIG. FIG. 11 is a side view illustrating another example of the configuration and operation of the guide unit, the movable member, and the guide member of the sheet post-processing apparatus according to the embodiment of the present invention. FIG. 12 is a diagram illustrating a state in which a pair of rollers of the sheet post-processing apparatus according to the embodiment of the present invention conveys a sheet bundle without bending it.

  FIG. 1 is a side view showing a schematic configuration of a sheet post-processing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the sheet post-processing apparatus 200 includes an introduction path P1 for receiving the image-formed sheet S discharged from the image forming apparatus 100, and three paths branched from the introduction path P1, that is, a proof. An upper conveyance path P2 toward the tray 8, an intermediate conveyance path P3 toward the stack tray 11, and a lower conveyance path P4 for performing stapling are formed.

  The image forming apparatus (image forming unit) 100 has a known configuration. For example, the image forming apparatus (image forming unit) 100 can be configured as an indirect transfer tandem color image forming apparatus. The image forming apparatus 100 includes, for example, a control unit, an image forming unit, an optical writing unit, a paper feed unit, a paper feed conveyance path, an image reading unit, an intermediate transfer unit, a fixing unit, a paper discharge conveyance path, a double-side conveyance path, and the like ( The image is formed on both sides or one side of the sheet S.

  In the introduction path P1, an introduction roller 1 for introducing the sheet S, an inlet sensor 2 for detecting the sheet S, and a conveyance roller 3 are provided. The branching claws 4 and 5 positioned at the end portion of the introduction path P1 are rotated and switched to change the position of the sheet S to one of the upper conveyance path P2, the middle conveyance path P3, and the lower conveyance path P4. Selective guidance to one.

  In the upper transport path P2 as the proof transport path, a transport roller 6, a paper discharge roller 7, and the like are provided. The sheet S conveyed on the upper conveying path P2 by the conveying roller 6, the discharge roller 7 and the like is discharged onto the proof tray 8.

  In the middle conveyance path P3 as the sort conveyance path, a conveyance roller 9, a discharge roller 10, and the like are provided. The sheet S conveyed on the intermediate conveyance path P3 by the conveyance roller 9, the discharge roller 10 and the like is discharged to the stack tray 11.

  In the lower conveyance path P4 as the staple conveyance path, conveyance rollers 12, 13, and 14, a discharge roller 15, a hitting roller 16, a reference fence 17, a jogger fence 18, a staple tray 20, and the like are provided. In the lower transport path P4, the sheet S is discharged to the staple tray 20 by the transport rollers 12, 13, and 14 and the paper discharge roller 15. The staple tray 20 is set to a size that can accommodate the set maximum size sheet S. The staple tray 20 can store a plurality of sheets S stacked in a flat posture. In the staple tray 20, due to the action of the hitting roller 16, the end portions in the conveyance direction of the plurality of sheets S are aligned with the reference fence 17 being abutted. Further, the end portions in the width direction of the plurality of sheets S are abutted against the jogger fence 18 and aligned. In the present embodiment, the staple tray 20 corresponds to the alignment unit.

  When the end of the sheet S is bound by the staple tray 20, the end binding stapler 19 sets a predetermined position of the end of the aligned sheet bundle B (see FIG. 3 and the like) to a binding needle (not shown). )) And so on. Thereafter, the rear end discharge claw 41, the paper discharge roller 10, and the like convey the sheet bundle B through the lower conveyance path P4 and discharge it to the stack tray 11.

  On the other hand, when saddle stitching is performed in which the center portion of the sheet S in the transport direction is bound by the staple tray 20, the saddle stitching stapler 30 sets the center portion of the aligned sheet bundle B in the transport direction to the binding needle (not shown). Use a binding tool such as Thereafter, after the folding mechanism 40 bends the sheet bundle B, the paper discharge roller 10 or the like discharges the sheet bundle B to the stack tray 11.

  FIG. 2 is a side view showing a schematic configuration of the saddle stitching stapler, and FIG. 3 is a plan view showing the saddle stitching stapler and the crease forming mechanism. 3 is a view of a part of FIG. 1 as viewed from above FIG.

  As shown in FIG. 3, the saddle stitching stapler 30 includes two staplers 30 </ b> A and 30 </ b> B that are spaced apart from each other in the width direction of the sheet S (sheet bundle B). , It can be bound simultaneously at two locations separated in the width direction. Each of the staplers 30 </ b> A and 30 </ b> B includes a pusher 32 that pierces a binding tool (not shown) into the sheet bundle B and a clincher 31 that supports the sheet bundle B from the opposite side of the pusher 32.

  As shown in FIG. 2, the pusher 32 is provided above the placement surface of the staple tray 20 (to the right in FIG. 2). The pusher 32 includes a base 32a and a movable portion 32b supported by the base 32a and reciprocally driven by a drive mechanism (not shown). In the present embodiment, by rotating the movable portion 32b by the driving mechanism, a binding tool (not shown) is pierced into the sheet bundle B and the sheet bundle B (see FIG. 3) is bound.

  As shown in FIG. 2, the clincher 31 is attached to the clincher support member 26. The clincher support member 26 is provided on the back side of the staple tray 20. The staple tray 20 is provided with a slit 20a through which the clincher 31 passes. The clincher support member 26 is pressed against the eccentric cam 27 by an urging mechanism (not shown), and when the eccentric cam 27 rotates, the clincher 31 passes through the slit 20a and protrudes toward the pusher 32, and from the slit 20a. The drawn state is switched. Note that rotation of a motor 28 as a drive source is transmitted to the eccentric cam 27 via a gear 29.

  As shown in FIG. 3, in the present embodiment, a crease forming mechanism 33 is provided adjacent to the saddle stitching stapler 30. The crease forming mechanism 33 includes a protruding wall portion 33a on the clincher 31 side and a base portion 33b on the pusher 32 side. The protruding wall portion 33a is divided into a plurality of portions where the clincher 31 is provided, and each portion of the divided protruding wall portion 33a and the clincher 31 are in the width direction of the sheet S (sheet bundle B) (FIG. 3). In the left-right direction). Further, the base portion 33b is divided into a plurality at the portion where the pusher 32 is provided, and each portion of the divided base portion 33b and the pusher 32 are along the width direction of the sheet S (sheet bundle B). It is lined up in a straight line. A concave groove (not shown) facing the protruding wall portion 33a is formed in the base portion 33b. And the base part 33b can protrude to the staple tray 20 side (slit 20a side) with the movable part 32b. In the present embodiment, as shown in FIG. 3, the base portion 33b is coupled to the shaft 35 together with the pusher 32 (the movable portion 32b), and rotates together with the movable portion 32b toward the staple tray 20 side. With the above-described configuration, the sheet bundle B is sandwiched between the protruding wall portion 33a and the recessed groove of the base portion 33b, and the sheet bundle B extends along the width direction of the sheet bundle B and the protruding wall portion 33a or A fold F (see FIG. 4 and the like) that is bent corresponding to the shape of the concave groove of the base portion 33b is formed. That is, in this embodiment, the crease forming mechanism 33 operates in conjunction with the saddle stitching stapler 30 and is positioned at the same position as the binding needle in the transport direction at the center of the sheet bundle B that is saddle stitched by the saddle stitching stapler 30. Thus, a fold line F extending in the width direction is formed.

  4 and 5 are side views showing the configuration and operation of the bending mechanism according to the present embodiment. The sheet bundle B aligned and saddle-stitched in the staple tray 20 is unloaded from the staple tray 20 by the rear end discharge claw 41 functioning as a conveyance mechanism, the conveyance roller 46, and the like, as shown in FIG. While being bent along the curved surface 43a as the outer peripheral surface of the guide portion 43 formed on the front side, the guide portion 43 heads toward the front end discharge claw 47 side.

  In the present embodiment, a roller pair 42 having two rollers 42 a and 42 b is provided to face the guide portion 43. In the roller pair 42, as shown in FIG. 5, the two rollers 42a and 42b sandwich the sheet bundle B and bend the sheet bundle B.

  As shown in FIGS. 4 and 5, in this embodiment, a guide member 45 having inclined surfaces 45b and 45c that gradually approach the curved surface 43a as it goes in the direction of carrying out the sheet bundle B from the staple tray 20 is provided. . The guide member 45 is provided so as to be swingable about a rotation center 45a. The sheet bundle B is guided by the guide member 45 and is easily bent along the curved surface 43 a of the guide portion 43.

  Further, the guide member 45 is provided with a conveyance roller 46 for conveying the sheet bundle B. Further, the guide portion 43 is provided with a roller 44 that contacts the sheet bundle B along the guide portion 43 from the curved surface 43a side. The roller 44 is rotatably held by the guide portion 43. As shown in FIGS. 4 and 5, in the present embodiment, the sheet bundle B is sandwiched between the conveyance roller 46 and the roller 44. The conveyance roller 46 and the roller 44 can reduce the conveyance resistance of the sheet bundle B, and can convey the sheet bundle B more smoothly. Makes it easier to follow. The transport roller 46 is driven to rotate by a motor, gear, etc. (not shown).

  As shown in FIG. 5, in this embodiment, when the central portion (fold F) in the conveyance direction of the sheet bundle B reaches a position facing the roller pair 42, the guide mechanism 50 moves the central portion of the sheet bundle B. Is guided to the roller pair 42.

  The bending mechanism 40 according to the present embodiment includes a movable member 48 as the guiding mechanism 50. The movable member 48 is provided to be able to project and retract on the curved surface 43 a, and guides the sheet bundle B bent along the curved surface 43 a toward the roller pair 42 by projecting on the curved surface 43 a. In the present embodiment, as shown in FIG. 9, at least on the side facing the roller pair 42, a plurality of guide portions 43 formed in a cylindrical shape or a column shape are spaced apart along the width direction of the sheet bundle B. A slit 43b is provided. A movable member 48 is accommodated in each slit 43b. As shown in FIG. 4, the movable member 48 is stored in the slit 43b while the sheet bundle B is conveyed along the curved surface 43a, and the distal end portion of the movable member 48 is below the curved surface 43a. I am immersed in the (curvature center side). Then, as shown in FIG. 5, when the central portion (fold F) in the conveying direction of the sheet bundle B reaches a position facing the roller pair 42, the movable member 48 protrudes outward from the slit 43b, and the movable member The front end portion of 48 protrudes upward from the curved surface 43a and pushes the central portion (fold F) in the conveyance direction of the sheet bundle B toward the gap between the rollers 42a and 42b of the roller pair 42.

  Furthermore, the bending mechanism 40 according to the present embodiment includes a rear end discharge claw 41 and a front end discharge claw 47 as the guide mechanism 50. The rear end discharge claw 41 forms a part of a first moving mechanism that moves the first portion B1 on the staple tray 20 side toward the roller pair 42 from the central portion (fold F) in the conveyance direction of the sheet bundle B. . The front end discharge claw 47 moves the second part B2 opposite to the first part B1 toward the roller pair 42 with respect to the central part (fold F) in the conveyance direction of the sheet bundle B. Part of the moving mechanism. In the present embodiment, as shown in FIG. 5, when the central portion (fold F) in the conveyance direction of the sheet bundle B reaches a position facing the roller pair 42, the rear end discharge claw 41 and the front end discharge claw 47 are Then, the sheet bundle B is pushed into the pair of rollers 42 from both sides in the conveyance direction, whereby the central portion (fold F) in the conveyance direction of the sheet bundle B approaches the gap between the rollers 42a and 42b of the roller pair 42. In the present embodiment, the trailing edge discharge claw 41 operates as a conveyance mechanism for the sheet bundle B and also operates as a guide mechanism 50.

  In the present embodiment, the sheet bundle B is formed with the crease F by the crease forming mechanism 33, so that the sheet bundle B is pushed by the movable member 48, or the rear end discharge claw 41 and the front end discharge claw 47. Therefore, when the sheet bundle B is pushed from both sides, the sheet bundle B is easily bent starting from the fold line F, and the bent posture is easily maintained. Therefore, according to the present embodiment, the accuracy of the folding position and the folding shape of the sheet bundle B can be further increased, and the sheet bundle B can be bent more smoothly than the sheet bundle B. Inconvenience is unlikely to occur.

  6 and 7 are side views showing the configuration and operation of a modified example of the guide mechanism. The bending mechanism 40 according to the example of FIGS. 6 and 7 includes a roller pair 51 as a guide mechanism 50 instead of the front end discharge claw 47. The roller pair 51 pulls the sheet bundle B downward in FIG. 6 until the central portion (fold F) in the conveyance direction of the sheet bundle B reaches a position facing the roller pair 42, as shown in FIG. 7, after the central portion in the conveyance direction of the sheet bundle B reaches a position facing the roller pair 42, as shown in FIG. In conjunction with 48, the second portion B2 of the sheet bundle B is rotated in the direction of moving toward the roller pair 42 (upward in FIG. 7).

  FIG. 8 is a side view illustrating an example of the configuration and operation of the guide unit, the movable member, and the guide member. In the example of FIG. 8, the rotation of the motor 62 as a drive source is converted into the reciprocating motion of the movable member 48 by the rack and pinion mechanism 61 having a pinion 61a and a rack 61b. In the example of FIG. 8, the reciprocating motion of the solenoid 63 as a drive source causes the guide member 45 that is rotatably supported by the main body (housing or the like) of the sheet post-processing apparatus 200 at the rotation center 45a. Converted to dynamic.

  FIG. 9 is a perspective view of the guide unit, the movable member, and the roller having the configuration of FIG. FIG. 10 is a front view of the configuration of FIG. As shown in FIGS. 9 and 10, the guide portion 43 is provided with a plurality of slits 43 b at intervals in the longitudinal direction, and a movable member 48 is accommodated in each slit 43 b. A plurality of movable members 48 are connected to the rack 61b via bar-like connecting members 61c, and the plurality of movable members 48 interlock with each other on the curved surface 43a of the guide portion 43 as the rack 61b reciprocates. Plunged into.

  As shown in FIGS. 9 and 10, another slit 43c is provided between the plurality of slits 43b in which the movable member 48 is accommodated, and the roller 44 is accommodated in each slit 43c. The roller 44 is exposed on the curved surface 43a and rotates by contacting the sheet bundle B conveyed along the curved surface 43a from the curved surface 43a side (that is, from the opposite side of the roller pair 42). The roller 44 can reduce the resistance when the sheet bundle B moves along the curved surface 43a. The roller 44 may be configured as a driven roller disposed opposite to the conveying roller 46 provided on the guide member 45, or the rotation of a motor as a driving source (not shown) may be transmitted via a gear, a shaft, or the like. Alternatively, it may be configured as a main driving (driving) roller that is transmitted and driven. In addition, an elastic member such as a plate spring or a coil spring is used to elastically urge the shaft of the roller 44 and the like so as to protrude on the curved surface 43a in the normal direction of the curved surface 43a. A configuration may be adopted in which the roller 44 can project and retract according to tension or the like.

  FIG. 11 is a side view showing another example of the configuration and operation of the guide portion, the movable member, and the guide member. In the example of FIG. 11, the guide member 45 is driven by an eccentric cam 81, the movable member 48 is driven by an eccentric cam 82, and the eccentric cams 81 and 82 are rolled by a motor 83 as a drive source via an endless belt 84. The

  FIG. 12 is a diagram illustrating an example of the operation when the roller pair conveys the sheet bundle without bending it. When the sheet bundle B is not bent by the roller pair 42, such as when the sheet bundle B is bound, the roller pair 42 conveys the sheet bundle B toward the stack tray 11 as shown in FIG. Can act as a mechanism. In this case, it is preferable that the force applied to the sheet bundle B by the roller pair 42 when bending is reduced or released by an acting force releasing mechanism (not shown).

  Furthermore, in the example of FIG. 12, when the roller pair 42 conveys the sheet bundle B without bending, the movable member 48 protrudes on the curved surface 43a to guide the conveyance of the sheet bundle B. The sheet bundle B is guided along the side surface 48 a of the movable member 48, and can move more reliably toward the gap between the roller pair 42.

  As described above, the sheet post-processing apparatus 200 according to the present embodiment includes the staple tray 20 as an alignment unit that stacks and aligns a plurality of sheets S in a flat posture, and the plurality of sheets aligned on the staple tray 20. A curved surface on which the trailing edge discharge claw 41 and the conveyance roller 46 as a conveyance mechanism for conveying the sheet bundle B of the sheet S and the sheet bundle B conveyed by the trailing edge discharge claw 41 and the conveyance roller 46 are bent. Guide portion 43 having 43a, roller pair 42 provided opposite to guide portion 43 and sandwiching and bending sheet bundle B, and sheet bundle B bent along curved surface 43a is guided toward roller pair 42. And a guiding mechanism 50 to be operated. Therefore, according to the present embodiment, after aligning a plurality of sheets S in a flat posture on the staple tray 20, the sheet bundle B can be bent from a state of being bent along the curved surface 43a. The folding mechanism 40 and thus the sheet post-processing device 200 can be made smaller while suppressing the accuracy of each processing for the bundle B) from being lowered.

  In the present embodiment, the guide mechanism 50 guides the sheet bundle B that is provided so as to protrude and retract on the curved surface 43 a, protrudes on the curved surface 43 a, and bends along the curved surface 43 a toward the roller pair 42. A movable member 48 is provided. Therefore, the sheet bundle B can be more reliably guided to the roller pair 42 with a relatively simple configuration.

  Further, in the present embodiment, the guide mechanism 50 is the rear as a first moving mechanism that moves the first portion B1 on the staple tray 20 side from the center in the conveyance direction of the sheet bundle B toward the roller pair 42. The front end as a second moving mechanism for moving the end discharge claw 41 and the second portion B2 opposite to the first portion B1 with respect to the central portion in the conveyance direction of the sheet bundle B toward the roller pair 42 A discharge claw 47 or a roller pair 51. Therefore, the sheet bundle B can be more reliably guided to the roller pair 42 with a relatively simple configuration. Further, by providing and interlocking both the first and second moving mechanisms and the movable member 48, the sheet bundle B can be guided to the roller pair 42 more reliably and more smoothly.

  In the present embodiment, the sheet post-processing apparatus 200 further includes a crease forming mechanism 33 that forms a fold F along the width direction of the sheet bundle B before being guided by the guide mechanism 50. . Therefore, the accuracy of the folding position and the folding shape of the sheet bundle B can be further increased, and the sheet bundle B can be folded more smoothly, so that inconvenience does not easily occur when the sheet bundle B is folded.

  In the present embodiment, the sheet post-processing device 200 guides the sheet bundle B conveyed from the staple tray 20 by the trailing edge discharge claw 41 or the conveyance roller 46 as a conveyance mechanism in a direction along the curved surface 43a. A member 45 is further provided. Therefore, the sheet bundle B can be more reliably along the curved surface 43a.

  In the present embodiment, the transport mechanism has the transport roller 46 provided on the guide member 45. Therefore, compared with the case where the guide member 45 and the conveyance roller 46 are provided separately, each component can be easily laid out, and the paper post-processing apparatus 200 can be configured more compactly.

  In the present embodiment, the sheet post-processing apparatus 200 includes the roller 44 that can rotate by contacting the sheet bundle B along the guide portion 43 from the curved surface 43a side. Therefore, the sheet bundle B can be more smoothly conveyed along the curved surface 43a.

  In the present embodiment, the roller pair 42 can sandwich and convey the sheet bundle B without bending the sheet bundle B. By operating the roller pair 42 also as a transport mechanism, it becomes easy to lay out each component, and the paper post-processing device 200 can be made smaller.

  Further, in the present embodiment, the rear end claw 41 as the transport mechanism, the transport roller 46, and the like move the sheet bundle B from the staple tray 20 along the movable member 48 with the movable member 48 protruding on the curved surface 43a. The sheet bundle B is conveyed toward the roller pair 42 while being separated from the curved surface 43a, and the roller pair 42 bends the sheet bundle B conveyed toward the roller pair 42 by the rear end discharge claw 41, the conveyance roller 46, and the like. It is possible to carry it without being caught. Therefore, the sheet bundle B can be more reliably conveyed by using the movable member 48 as a guide for the sheet bundle B.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. In addition, a sheet post-processing device, an image forming apparatus, a sheet, a sheet bundle, an alignment unit, a conveyance mechanism, a curved surface, a guide unit, a roller pair, a guide mechanism, a movable member, a first part, a second part, and a first part Specs (system, configuration, shape, material, number, arrangement, size, length, width, thickness, etc. of moving mechanism, second moving mechanism, crease forming mechanism, guide member, transport roller, roller, image forming unit, etc. Etc.) can be implemented with appropriate changes.

  As described above, the present invention is useful for a sheet post-processing apparatus or an image forming apparatus having a mechanism for bending a sheet.

20 ... Staple tray (alignment section)
33 ... crease forming mechanism 41 ... rear end discharge claw (conveying mechanism, guiding mechanism, first moving mechanism)
42 ... Roller pair 43 ... Guide part 43a ... Curved surface 44 ... Roller 45 ... Guide member 46 ... Conveying roller (conveying mechanism)
47 ... front end discharge claw (guidance mechanism, second movement mechanism)
48 ... movable member 50 ... guide mechanism 100 ... image forming apparatus (image forming unit)
200: Paper post-processing device S: Sheet B: Sheet bundle B1: First part B2: Second part F: Fold (central part)

Claims (10)

An alignment unit that stacks and aligns a plurality of sheets in a flat posture;
A transport mechanism for transporting a sheet bundle of a plurality of sheets aligned in the alignment unit;
A guide portion having a curved surface along which the sheet bundle conveyed by the conveying mechanism bends;
A pair of rollers provided facing the guide portion and sandwiching and bending the sheet bundle;
A guide mechanism that guides the sheet bundle bent along the curved surface toward the roller pair , wherein the first portion closer to the alignment portion than the center portion in the conveyance direction of the sheet bundle is the roller pair. And a second moving mechanism for moving a second portion opposite to the first portion relative to the central portion in the conveyance direction of the sheet bundle toward the roller pair. A guiding mechanism having a moving mechanism ;
A sheet post-processing apparatus comprising: An alignment unit that stacks and aligns a plurality of sheets in a flat posture;
  A transport mechanism for transporting a sheet bundle of a plurality of sheets aligned in the alignment unit;
  A guide portion having a curved surface along which the sheet bundle conveyed by the conveying mechanism bends;
  A roller pair that is provided facing the guide portion and that can select a mode in which the sheet bundle is sandwiched and bent and a mode in which the sheet bundle is sandwiched and conveyed without being folded.
  A guide mechanism for guiding the sheet bundle bent along the curved surface toward the roller pair;
  A sheet post-processing apparatus comprising: The guide mechanism has a movable member that is provided so as to be able to project and retract on the curved surface, and that guides the sheet bundle that protrudes on the curved surface and bends along the curved surface toward the roller pair. The sheet post-processing apparatus according to claim 1 or 2 .   The crease forming mechanism for forming a crease along the width direction of the sheet bundle before being guided by the guide mechanism is further provided. The paper post-processing device as described in 1.   5. The guide member according to claim 1, further comprising a guide member that guides the sheet bundle conveyed from the alignment unit by the conveyance mechanism in a direction along the curved surface. Paper post-processing device.   The sheet post-processing apparatus according to claim 5, wherein the transport mechanism includes a transport roller provided on the guide member.   The sheet post-processing apparatus according to claim 1, further comprising a roller that can rotate by contacting the sheet bundle along the guide portion from the curved surface side. The conveying mechanism conveys the sheet bundle from the alignment unit along the movable member toward the roller pair while being separated from the curved surface in a state where the movable member protrudes on the curved surface; and 4. The sheet post-processing according to claim 3 , wherein the roller pair can sandwich and convey the sheet bundle conveyed toward the roller pair by the conveying mechanism without being bent. apparatus. An image forming unit for forming an image on a sheet;
An alignment unit that stacks and aligns a plurality of sheets on which images are formed in the image forming unit in a flat posture;
A transport mechanism for transporting a sheet bundle of a plurality of sheets aligned in the alignment unit;
A guide portion having a curved surface along which the sheet bundle conveyed by the conveying mechanism bends;
A pair of rollers provided facing the guide portion and sandwiching and bending the sheet bundle;
A guide mechanism that guides the sheet bundle bent along the curved surface toward the roller pair , wherein the first portion closer to the alignment portion than the center portion in the conveyance direction of the sheet bundle is the roller pair. And a second moving mechanism for moving a second portion opposite to the first portion relative to the central portion in the conveyance direction of the sheet bundle toward the roller pair. A guiding mechanism having a moving mechanism ;
An image forming apparatus comprising:   An image forming unit for forming an image on a sheet;
  An alignment unit that stacks and aligns a plurality of sheets on which images are formed in the image forming unit in a flat posture;
  A transport mechanism for transporting a sheet bundle of a plurality of sheets aligned in the alignment unit;
  A guide portion having a curved surface along which the sheet bundle conveyed by the conveying mechanism bends;
  A roller pair that is provided facing the guide portion and that can select a mode in which the sheet bundle is sandwiched and bent and a mode in which the sheet bundle is sandwiched and conveyed without being folded.
  A guide mechanism for guiding the sheet bundle bent along the curved surface toward the roller pair;
  An image forming apparatus comprising:

Images