JP2016222444A - Sheet binding device and image formation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet binding device capable of securing booklet quality.SOLUTION: A sheet binding device 1A comprises: a support member 2 which is loaded with a center-folded main body 10 and a front cover 11; a pressing member 3 which presses the main body 10 and the front cover 11 to the support member; a stapler which inserts a binding needle through the main body 10 and the front cover 11; and a clincher which bends the binding needle to bind the main body 10 and the front cover 11. The pressing member 3 includes a pressing recess 30 which presses the main body 10 and the front cover 11. When the angle of the pressing recess 30 is opened to a front cover guide angle α2, and the pressing member 3 descends to a front cover guide position T2, a deviation from the binding position is suppressed without giving a fold to the front cover 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sheet binding apparatus that binds a folded booklet with a binding needle and an image forming system in which the sheet binding apparatus is incorporated.

  Conventionally, a technique for binding a bundle of sheets with a binding needle called a staple is known. In such bookbinding work, booklet finishing quality and productivity improvement such as misalignment of crease positions are required, and as a method for solving these, a bookbinding machine called a saddle stitching method has been proposed. (For example, refer to Patent Document 1).

  In the saddle stitching method, a technique is known in which the shift of the crease position is suppressed by pressing a booklet stacked in an inverted V-shape by pressing it with an inverted V-shaped pressing member.

  In addition, a technique has been proposed in which only the front cover is creased so that the back of the cover creases and the cover image is not cracked (for example, see Patent Document 2).

Japanese Patent No. 4135595 Japanese Patent No. 5500156

  However, even if only the cover is folded, the cover and the body loaded on the V-shaped support member are pressed by the reverse V-shaped pressing member, so that the fold of the body is transferred to the cover. Streaks stick to the cover. As a countermeasure, if the pressing member is a flat surface, the position of the crease cannot be held, and there is a possibility that the binding position may be displaced or the cover and the body may be displaced.

  SUMMARY An advantage of some aspects of the invention is to provide a sheet binding device capable of ensuring booklet quality and an image forming system including the sheet binding device.

  In order to solve the above-described problem, the invention according to claim 1 is a booklet with a stapler that allows a binding needle to pass through a booklet, a clincher that bends the binding needle that passes through the booklet, and a fold of the booklet that protrudes upward. And a pressing member that presses the booklet supported by the supporting member from above, and the pressing member constitutes a pair of pressing recesses having a triangular cross-sectional shape that presses the booklet. The pressing member is configured so that the position of the pressing member relative to the support member can be switched, and the angle of the pressing recess can be switched, and the support member forms a triangular cross-sectional shape that supports the booklet. The sheet binding device includes a surface and is configured to be capable of switching an angle between a pair of support surfaces.

  According to a second aspect of the present invention, the pressing member is disposed between the pressing member and the supporting member, the first position forming a gap in which the booklet body can be stacked, and the supporting member side from the first position. A second position that constitutes a gap between the pressing member and the main body loaded on the supporting member, in which a cover having a larger crease angle than the main body loaded on the supporting member can be stacked, and the supporting member from the second position. The sheet binding device according to claim 1, wherein the sheet binding device is configured to be movable to a third position where the body and the cover loaded on the support member are pressed by the pressing member.

  In the invention according to claim 3, the pressing member has an angle of the pressing recess according to the first angle corresponding to the angle of the fold of the book body and the angle of the fold of the cover having a larger fold angle than the main body. The sheet binding device according to claim 1 or 2, wherein the sheet binding device is configured to be switchable between a second angle and a third angle larger than the second angle.

  According to a fourth aspect of the present invention, in the support member, the angle between the pair of support surfaces is a first support angle corresponding to the angle of the fold of the booklet body and a second angle corresponding to the third angle of the pressing recess. The sheet binding device according to claim 3, wherein the sheet binding device is configured to be switchable to a support angle of 5.

  According to the fifth aspect of the present invention, in the operation of stacking the booklet body, the pressing member moves between the pressing member and the support member to a first position that constitutes a gap in which the booklet body can be stacked. The angle of the holding recess is set to a first angle corresponding to the angle of the fold of the booklet body, and the support member has a first angle corresponding to the angle of the fold of the booklet body. In the operation of loading a cover that is set at a support angle and has a crease angle larger than that of the main body stacked on the support member, the pressing member has a form that opens from the main body between the pressing member and the main body stacked on the support member. In the operation of moving the cover to the second position that constitutes the stackable gap and the angle of the pressing recess is set to the second angle corresponding to the angle of the fold of the cover, Loaded on the support member The body and the cover are moved to a third position where they are pressed by the pressing member, the angle of the pressing recess is set to a third angle larger than the second angle, and the supporting member has an angle between the pair of supporting surfaces, It is a paper binding apparatus of any one of Claims 1-4 set to the 2nd support angle according to the 3rd angle of the said pressing recessed part.

  According to a sixth aspect of the present invention, there is provided an image forming system including the sheet binding device according to any one of the first to fifth aspects.

  In the present invention, when the cover of a booklet whose folds are sweetly folded is stacked on the booklet body, the angle of the holding recess is set according to the fold of the cover, and the holding member is placed at a position where the cover can be guided. By moving, the position of the fold can be matched with the binding position, and it is possible to suppress the streaking of the cover fold.

It is a principal part perspective view which shows an example of the paper binding apparatus of this Embodiment. It is a principal part side view which shows the operation example of the paper binding apparatus of this Embodiment. It is a principal part side view which shows the operation example of the paper binding apparatus of this Embodiment. It is a principal part side view which shows the operation example of the paper binding apparatus of this Embodiment. It is a principal part side view which shows the operation example of the paper binding apparatus of this Embodiment. 1 is a configuration diagram illustrating an example of an image forming system in which a sheet binding device according to an exemplary embodiment is incorporated. It is a block diagram which shows an example of an opening / closing mechanism. It is a block diagram which shows an example of a drive mechanism. 6 is a flowchart illustrating an example of the operation of the sheet binding device of the present embodiment. It is explanatory drawing which shows the other operation example of the paper binding apparatus of this Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of a sheet binding device and an image forming system incorporating the paper binding device of the present invention will be described below with reference to the drawings.

<Configuration Example of Sheet Binding Device and Image Forming System of Embodiment>
FIG. 1 is a perspective view of a main part showing an example of a paper binding apparatus of the present embodiment, FIGS. 2 to 5 are side views of main parts of an operation example of the paper binding apparatus of the present embodiment, and FIG. 1 is a configuration diagram illustrating an example of an image forming system in which a sheet binding device according to an exemplary embodiment is incorporated.

  As shown in FIG. 6, the sheet binding apparatus 1 </ b> A according to the present embodiment is combined with an image forming apparatus 100 that forms an image on a sheet and discharges it, thereby forming an image forming system 101. In this example, the image forming system 101 includes an image forming apparatus 100, an intermediate conveyance device 200, a saddle stitching processing device 300, and a side stitching processing device 400.

  The image forming apparatus 100 forms an image on a sheet. The image forming apparatus 100 includes, for example, a conveyance unit that pulls out and conveys paper stocked as a recording medium from a paper tray, a development unit that develops a toner image corresponding to bitmap data on a primary transfer member such as a transfer roller, and primary transfer. A primary transfer unit that transfers the toner image developed on the member to a secondary transfer member such as the transfer drum 150; a secondary transfer unit that transfers the toner image transferred to the secondary transfer member onto a sheet conveyed by the conveyance unit; The image forming apparatus includes a fixing unit that fixes the transferred toner image on the sheet, and a discharge unit that discharges the sheet after the fixing process by the fixing unit. The image forming apparatus 100 conveys the sheet on which the image is formed to the intermediate conveying apparatus 200.

  The intermediate transport apparatus 200 is an apparatus that can temporarily wait for a sheet and can perform creasing and cutting on the sheet. The intermediate transport device 200 is, for example, a standby called a stacker that transports the paper transported from the image forming apparatus 100 so as to descend and temporarily stops and waits in a state where the paper surface of the paper is substantially along the vertical direction. An alignment unit that aligns the position of the standby paper, a creasing unit called a crease that performs scoring on the aligned paper, and a margin portion of the paper while conveying the scoring paper. A cutting unit called a slitter for cutting is provided.

  The intermediate conveyance device 200 performs alignment by the alignment unit while the paper conveyed from the image forming apparatus 100 is temporarily stopped in the standby unit, and then performs the creasing process by the creasing unit, and then the creasing is performed. The margin of the paper is cut by the cutting unit while the paper is conveyed. Thereafter, the intermediate conveyance device 200 conveys the paper whose margin portion has been cut by the cutting unit to the saddle stitching processing device 300.

  The saddle stitching processing device 300 is a sheet processing device that performs a center folding process for folding a sheet into two (folded), and creates a booklet that is saddle-stitched by stacking a predetermined number of the folded sheets. It is an apparatus that performs processing, cutting processing for cutting a booklet, and the like.

  The saddle stitching processing device 300, for example, a center folding unit 310 that folds the sheet conveyed from the intermediate conveyance device 200, and a conveyance that conveys the sheet folded by the middle folding unit 310 in a direction along the fold of the sheet. After the mechanism 320 and the paper transported by the transport mechanism 320 are overlapped, the paper binding device 1A that performs saddle stitching with respect to the booklet 10B and the edge processing of the edge of the booklet 10B that has been saddle-stitched are performed. A cutting unit 370 and the like are provided.

  Next, the details of the sheet binding device 1A of the present embodiment will be described with reference to FIGS. The sheet binding device 1A is configured such that the main body 10 of the booklet 10B folded in the middle is stacked in a direction in which the fold line 10a is convex in the example in which the fold line 10a is convex, and is stacked on the main body 10 to overlap the main body 10 A support member 2 on which a book cover 11 having a fold 11a sweetly folded at an angle shallower than the fold 10a is loaded, and a pressing member 3 that presses the book body 10 and the cover 11 against the support 2 is provided.

  The sheet binding apparatus 1 </ b> A includes a stapler 4 that allows the binding needle to penetrate the book body 10 and the cover 11, and a clincher 5 that bends the binding needle and binds the book body 10 and the cover 11.

  Further, the sheet binding device 1 </ b> A moves the stapler 4 in a direction in which the stapler 4 is moved away from or in contact with the clincher 5, and moves in the direction in which the pressing member 3 is moved away from or in contact with the support member 2 in conjunction with the stapler 4. Is provided.

  The support member 2 is an example of a booklet pressing unit, and includes a pair of support surfaces 20 that support one side and the other side of the body 10 with the fold line 10a interposed therebetween. The support member 2 has a pair of support surfaces 20 at a first support angle in a direction in which the fold 10a of the main body 10 and the fold 11a of the cover 11 are opened with the vicinity of the fold 10a of the lowermost body 10 as a virtual fulcrum O. It is configured to be openable and closable from a certain standby angle α10 to a pressing angle α11 that is a second support angle. The support member 2 includes a support convex portion (not shown) that supports the fold line 10 a of the main body 10. The support convex portion is urged upward by a spring, and is configured to be able to move up and down by pressing a booklet by a pressing member.

  The standby angle α10 is set to be approximately equal to the angle formed by the fold line 10a of the book body 10. The pressing angle α11 is set to an angle at which the crease 10a of the main body 10 is not transferred to the crease 11a of the cover 11.

  The pressing member 3 is an example of a booklet pressing means, and includes a pressing recess 30 that aligns the position of the fold 10a of the main body 10 with the binding position P and guides the position of the fold 11a of the cover 11 to the binding position P. The pressing member 3 is provided with a concave portion that has a triangular shape in accordance with the binding position P by the stapler 4, thereby forming a pressing concave portion 30.

  Then, the operation of loading the main body 10 on the support member 2, the operation of stacking the cover 11, and the operation of the binding needle penetrating the main body 10 and the cover 11, the angle of the holding recess 30 is an angle suitable for each operation. The pressing member 3 includes a first pressing member 31a and a second pressing member 31b so that the angle of the pressing recess 30 is variable.

  The pressing member 3 is supported by the arm 60 constituting the driving mechanism 6 such that the first pressing member 31a and the second pressing member 31b are rotatable about the shaft 33, and the first pressing member 31a and the second pressing member 31b are supported. The combination of the pressing members 31b constitutes a pressing concave portion 30 whose apex portion aligned with the binding position P is a concave triangular shape.

  The pressing member 3 includes a spring 34 that regulates the angle of the pressing recess 30 that is an angle formed by the first pressing member 31a and the second pressing member 31b. The spring 34 is an example of an urging means, and is constituted by a torsion coil spring, for example.

  The pressing member 3 is applied with a spring 34 to rotate the first pressing member 31a and the second pressing member 31b with the shaft 33 as a fulcrum in a direction in which the angle of the pressing recess 30 decreases.

  The pressing member 3 includes an opening / closing mechanism 35 that opens and closes the first pressing member 31a and the second pressing member 31b. FIG. 7 is a configuration diagram illustrating an example of an opening / closing mechanism. The opening / closing mechanism 35 receives the driving force of the driving unit 37 such as a motor and rotates about the shaft 35a.

  The opening / closing mechanism 35 includes a first pressing portion 36a that comes into contact with a first engaging portion 32a provided on the first pressing member 31a at one end portion with respect to the shaft 35a, and at the other end portion with respect to the shaft 35a. The second pressing member 36b includes a second pressing portion 36b that contacts the second engaging portion 32b provided on the second pressing member 31b.

Accordingly, in the pressing member 3, the first pressing portion 36 a presses the first engaging portion 32 a and the second pressing portion 36 b becomes the second when the opening / closing mechanism 35 rotates in the direction of the arrow a ₁ . The engaging portion 32b is pressed, and the first pressing member 31a and the second pressing member 31b rotate against the spring 34 in a direction to open the shaft 33 as a fulcrum.

  In the state where the opening / closing mechanism 35 is shown in FIG. 7A, as shown in FIG. 2, the angle of the pressing recess 30 is switched to a standby angle α1, which is a predetermined acute angle as an example of the first angle. When the opening / closing mechanism 35 is in the state shown in FIG. 7B, as shown in FIGS. 3 and 4, the angle of the holding recess 30 is switched to the cover guide angle α2 that is a predetermined obtuse angle, which is an example of the second angle. It is done. When the opening / closing mechanism 35 is in the state shown in FIG. 7C, as shown in FIG. 5, the angle of the pressing recess 30 is switched to a pressing angle α3 which is an obtuse angle as an example of a third angle larger than the cover guide angle α2. It is done.

Further, the pressing member 3, by opening and closing mechanism 35 is rotated in the arrow a ₂ direction, the rotation first pressing member 31a and the second pressing member 31b by the restoring force of the spring 34 in the direction to bind a shaft 33 as a fulcrum To do. In addition, it is good also as a structure which transmits the motion of the opening-and-closing mechanism 35 to the 1st press member 31a and the 2nd press member 31b, and does the operation | movement rotated in the closing direction, without using the restoring force of the spring 34.

  The standby angle α1 is set to be approximately equal to the angle formed by the fold line 10a of the book body 10. Further, the cover guide angle α2 is set to be equal to or slightly smaller than the fold 11a of the cover 11 that is sweet-folded at a shallower angle than the fold 10a of the main body 10 without increasing the angle of the fold 11a. The cover 11 can be guided. Furthermore, the pressing angle α3 is set to an angle at which the crease 10a of the main body 10 is not transferred to the crease 11a of the cover 11.

FIG. 8 is a configuration diagram illustrating an example of a drive mechanism. The drive mechanism 6 includes a cam 61 that moves the position in the height direction with respect to the support member 2 by moving the pressing member 3 up and down by the rotation of the arm 60. The cam 61 is an example of a driving unit, and includes displacement surfaces 61 a _{1 to} 61 a ₃ that abut on a roller 60 a provided on the arm 60 on the outer peripheral surface.

Cam 61, than the radius _{r 1} from the center Oc to the displacement surfaces 61a _1, radius _{r 2} from the center Oc to the displacement surfaces 61a ₂ is formed larger than the radius _{r 2} from the center Oc to the displacement surfaces 61a _2, center radius _{r 3} greater constructed from Oc to displacement surfaces 61a _3.

In the pressing member 3, the arm 60 does not rotate and the position of the pressing member 3 in the height direction is not displaced while the roller 60 a is in contact with the displacement surface 61 a ₁ by the rotation operation of the cam 61. Further, while the roller 60a is in contact with the displacement surfaces 61a _2, arm 60 does not rotate, the height of the pressing member 3 is not displaced. Similarly, while the roller 60a is in contact with the displacement surfaces 61a _3, the arm 60 does not rotate, the height of the pressing member 3 is not displaced.

In contrast, the pressing member 3 is in the rotation of the cam 61, the portion where the roller 60a contacts moves from displacement surfaces 61a ₁ to the displacement surface 61a _2, arm 60 rotates the shaft 60b as a fulcrum, the pressing member 3 The position in the height direction changes. Further, in the rotational operation of the cam 61, the portion where the roller 60a contacts moves from displacement surfaces 61a ₂ on displacement surfaces 61a _3, the arm 60 rotates the shaft 60b as a fulcrum, a change in the height of the pressing member 3.

Pressing member 3 is in the rotation of the cam 61, in the state in which the roller 60a is in contact with the displacement surfaces 61a _1, as shown in FIG. 2, the standby position the height of the pressing member 3 is in the first position of the predetermined It is switched to T1. In a state where the roller 60a is in contact with the displacement surfaces 61a _2, 3, 4, the height of the pressing member 3 is switched to the cover guide position T2 is a second position lower than the standby position T1 . In a state where the roller 60a is in contact with the displacement surfaces 61a _2, as shown in FIG. 5, the height of the pressing member 3 is switched to the pressing position T3 is a third position lower than the cover guide position T2.

  In the standby position T1, a predetermined space is formed between the pressing member 3 and the support member 2, and the main body 10 can be loaded. In the cover guide position T2, a predetermined gap is formed between the uppermost position of the main body 10 stacked on the support member 2 and the pressing member 3 so that the position of the fold line 11a can be guided to the binding position P. It is possible. The pressing position T3 is a state in which the body 10 and the cover 11 can be pressed against the support member 2 by the pressing member 3.

  In this example, the movement of the pressing member 3 in the height direction and the opening and closing operations of the first pressing member 31a and the second pressing member 31b can be performed independently. For example, FIG. 3 shows an example in which the pressing recess 3 is at the cover guide position T2 and the angle of the pressing recess 30 is the cover guide angle α2, but the angle of the pressing recess 30 is set to the standby angle α1. It is also possible to do.

  Returning to FIG. 1, the sheet binding device 1 </ b> A includes a body guide 70 and a cover guide 71. The body guide 70 guides the position of the fold line 10a of the body 10 in a state where the pressing member 3 is at the standby position T1. The body guide 70 is not interlocked with the raising and lowering of the pressing member 3, and the position in the height direction is fixed. The cover sheet guide 71 guides the position of the fold line 11a of the cover sheet 11 when the pressing member 3 is in the cover sheet guide position T2. The cover guide 71 is interlocked with the elevation of the pressing member 3. Here, the cover guide 71 has a V shape having an angle equivalent to the fold line 11 a of the cover 11.

<Operation Example of Sheet Binding Device and Image Forming System of Embodiment>
FIG. 9 is a flowchart showing an example of the operation of the paper binding apparatus according to the present embodiment. Next, the operation of binding the body 10 and the cover 11 by the paper binding apparatus 1A will be described with reference to each drawing.

  In the image forming system 101, the body 10 that has been subjected to the half-folding process and the stacking process in the saddle stitching processing apparatus 300 is conveyed to the sheet binding apparatus 1A. In the operation of loading the main body 10 in step SA1 of FIG. 9, the sheet binding device 1A sets the holding member 3 to the standby position T1 and the holding recess 30 to the standby angle α1, as shown in FIG. The main body 10 is loaded on the support member 2 with 20 as the standby angle α10. In the standby position T1, a predetermined space is formed between the pressing member 3 and the support member 2, and the contact at the time of loading the main body 10 is suppressed, thereby improving the loading speed and improving the productivity. it can.

  If it is determined in step SA2 in FIG. 9 that the stacking of the main body 10 has been completed, in step SA3 in FIG. 9, the sheet binding device 1A moves the pressing member 3 to the cover guide position T2 as shown in FIG. Then, the angle of the holding recess 30 is opened to the cover guide angle α2. The sweetly folded cover 11 is loaded on the body 10 with the position of the fold 11 a guided by the cover guide 71 and the pressing recess 30.

  As described above, the cover guide angle α2 is set to an angle that is equal to or slightly smaller than the fold 11a of the cover 11 that is sweet-folded at a shallower angle than the fold 10a of the main body 10, so that the cover 11 The fold line 11a is guided to the binding position P. Further, when the fold line 11a of the cover 11 is guided, the fold line 11a cannot be bent in a direction in which the angle increases. Accordingly, the crease 11a is suppressed from being streaked.

  If it is determined in step SA4 in FIG. 9 that the stacking of the cover 11 has been completed, in step SA5 in FIG. 9, the sheet binding apparatus 1A opens the support surface 20 to the pressing angle α11 as shown in FIG. The angle of the crease 10a is increased.

  If it is determined in step SA6 in FIG. 9 that the opening operation of the support surface 20 has been completed, in step SA7 in FIG. 9, the sheet binding device 1A sets the angle of the pressing recess 30 to the pressing angle α3 as shown in FIG. After opening, the pressing member 3 is moved to the pressing position T3.

  In the operation of stacking the body 10 on the support member 2, the position of the fold line 10a is adjusted to the binding position P by setting the angle of the pressing recess 30 to the standby angle α1. Further, in the operation of stacking the cover sheet 11 on the support member 2, the position of the fold line 11a is adjusted to the binding position P by opening the angle of the pressing recess 30 to the cover sheet guide angle α2. Further, since the pressing member 3 is positioned at the cover guide position T2, a predetermined gap is formed between the uppermost body 10 and the pressing member 3, so that the crease can be obtained by the effect in accordance with the angle of the pressing recess 30. It is suppressed that 11a is streaked.

  In this state, by opening the support surface 20 at the pressing angle α11, the fold line 10a of the main body 10 is opened, but the positional deviation with respect to the binding position P is suppressed. Further, the cover 11 and the body 10 are pressed against the support member 2 by the pressing member 3 in a state in which the pressing recess 30 is opened at the pressing angle α 3, so that the fold line 10 a of the main body 10 and the binding position P of the fold line 11 a of the cover 11 are set. Misalignment is suppressed, and the crease 11a is suppressed from being streaked.

  Then, after the body 10 and the cover 11 are pressed against the support surface 20 by the pressing member 3 in a state where the fold line 10 a of the body 10 is opened at a predetermined obtuse angle, the stapler 4 is moved in a direction approaching the clincher 5. Thus, the main body 10 and the cover 11 are sandwiched between the stapler 4 and the clincher 5. Then, the binding needle is driven out by the stapler 4 to penetrate the main body 10 and the cover 11, and the main needle 10 and the cover 11 are bound by the binding needle by bending the leg portion of the binding needle that has penetrated the main body 10 and the cover 11 with the clincher 5. It is bound.

  If it is determined in step SA8 in FIG. 9 that the binding process has been completed, in step SA9 in FIG. 9, the pressing member 3 is moved to the standby position T1, the angle of the pressing recess 30 is returned to the standby angle α1, and the support surface 20 is moved. The standby angle α10 is restored.

  FIG. 10 is an explanatory diagram illustrating another operation example of the sheet binding device according to the present embodiment. When the cover 11 may have a crease 11a, as shown in FIG. 2, the cover 11 is stacked with the holding recess 30 at the standby angle α1. Then, as shown in FIG. 10, the pressing member 3 is moved to the pressing position T3 in a state where the support surface 20 is held at the standby angle α10 and the angle of the pressing recess 30 is held at the standby angle α1. Note that, after the pressing member 3 is moved to the pressing position T3, the binding position 30 is crushed, so that the angle of the pressing concave portion 30 is opened to the pressing angle α3, and the support surface 20 is opened to the pressing angle α11. Since the positions of the folds are sometimes adjusted, it is possible to prevent the positions of the folds from shifting.

  The present invention is applied to a sheet binding device that saddle-stitches a booklet with a binding needle, and an image forming system including the sheet binding device.

  DESCRIPTION OF SYMBOLS 1A ... Sheet binding apparatus, 2 ... Support member, 20 ... Support surface, 3 ... Holding member, 30 ... Holding recessed part, 31a ... 1st pressing member, 31b ... Second pressing member, 33 ... shaft, 35 ... opening / closing mechanism, 4 ... stapler, 5 ... clincher, 6 ... drive mechanism, 101 ... image forming system

Claims (6)

A stapler that passes the binding needle through the booklet;
A clincher that bends the binding needle that penetrates the booklet;
A support member that supports the booklet from the lower side in a state where the fold of the booklet is convex upward,
A pressing member that presses the booklet supported by the support member from above;
The pressing member includes a pair of pressing members that form a pressing recess having a triangular cross-sectional shape that presses a booklet, the position of the pressing member relative to the support member is configured to be switchable, and the pressing recess The angle is configured to be switchable,
The sheet binding device, wherein the support member includes a pair of support surfaces that form a triangular cross-sectional shape that supports a booklet, and an angle of the pair of support surfaces is switchable. The pressing member includes a first position that constitutes a gap in which a booklet can be stacked between the pressing member and the supporting member, and is closer to the supporting member than the first position. A second position that forms a gap between the main bodies stacked on the support member and capable of stacking a cover having a larger crease angle than the main body stacked on the support member, and the support member side from the second position. The sheet binding device according to claim 1, wherein the sheet binding device is configured to be movable to a third position where the body and the cover loaded on the support member are pressed by the pressing member. In the pressing member, the pressing recess has an angle of the first angle corresponding to the angle of the fold of the booklet, a second angle corresponding to the angle of the fold of the cover whose fold angle is larger than the body, 3. The sheet binding device according to claim 1, wherein the sheet binding device is configured to be switchable to a third angle larger than an angle of 2. In the support member, the angle of the pair of support surfaces can be switched between a first support angle corresponding to the angle of the fold of the booklet body and a second support angle corresponding to the third angle of the holding recess. The sheet binding device according to claim 3, wherein the sheet binding device is configured as follows. In the operation of stacking the booklet body, the pressing member moves between the pressing member and the support member to a first position that constitutes a gap in which the booklet body can be stacked, and the angle of the pressing recess. Is set to a first angle corresponding to the fold angle of the booklet body, and the support member has a pair of support surface angles set to a first support angle corresponding to the booklet fold angle. Set,
In the operation of stacking a cover having a fold angle larger than that of the main body stacked on the support member, the pressing member has a cover in a form opened from the main body between the pressing member and the main body stacked on the support member. While moving to a second position constituting a stackable gap, the angle of the pressing recess is set to a second angle corresponding to the angle of the fold of the cover,
In the operation of binding the body and the cover, the pressing member moves to the third position where the body and the cover stacked on the support member are pressed by the pressing member, and the angle of the pressing recess is a second angle. A larger third angle is set, and the angle of the pair of support surfaces of the support member is set to a second support angle corresponding to the third angle of the pressing recess. The sheet binding device according to any one of claims 1 to 4. An image forming system comprising the sheet binding device according to any one of claims 1 to 5.

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