JP2017100883A - Sheet processing device and image formation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a pressurizing force when performing additional-folding with a back of a sheet bundle having been saddle-stitched.SOLUTION: A saddle-stitched binding device 2 includes an additional folding roller unit 260 which performs additional-folding by pressurizing a folding line part SB1 of a sheet bundle SB that has been folded, and a unit moving mechanism 263 for reciprocally moving the additional folding roller unit 260 in width direction of the sheet bundle SB. It includes guide shafts 280a, 280b on upper side and lower side for supporting the additional folding roller unit 260 and guiding movement, and a moving roller 262m which supports the additional folding roller unit 260 from below the additional folding roller unit 260, for moving on a stay 284 of the saddle-stitched binding device 2.SELECTED DRAWING: Figure 25

Description

The present invention relates to a sheet processing apparatus and an image forming system, and in particular, a function of folding a sheet-like recording medium such as paper, recording paper, transfer paper (hereinafter simply referred to as “sheet” in the present specification). And an image forming system including the sheet processing apparatus.

2. Description of the Related Art Conventionally, in a post-processing apparatus used in combination with an image forming apparatus such as a copying machine, a sheet is formed by a pair of folding rollers that are bound in the center of a sheet and installed in parallel with the sheet folding direction for one or a plurality of sheets. Some bookbinding saddle-stitched booklets by folding the center of the bundle.
Furthermore, in order to reinforce the fold of the saddle stitch booklet, a technique of additionally folding by a roller moving along the back of the booklet is already known.

In such an additional folding technique, in order to further fold the back (fold portion) of the booklet (sheet bundle) with the additional folding roller, the roller waiting outside the booklet is placed on the back of the booklet and moved. It is like that.

As this kind of folding technique, for example, JP 2009-190824 A (Patent Document 1).
The invention described in) is known. The present invention includes a pressure roller that rolls on a fold portion of a sheet bundle folded by a folding means, an elastic biasing means that elastically biases the pressure roller in the thickness direction of the sheet bundle, and the pressure roller And a driving means for moving the sheet bundle in a direction orthogonal to the sheet bundle conveying direction, and the fold portion of the sheet bundle folded by the folding means is re-pressurized by the folding means and the fold is formed. In the sheet folding apparatus for strengthening the sheet, the pressure roller is temporarily raised so as not to ride on the end face before reaching the end face of the sheet bundle, and after being lifted, the pressure roller is lowered from a predetermined position. It is characterized by comprising ascending and descending means for contacting the upper surface of the crease portion.

In the invention described in this cited document 1, before the pressure roller contacts the end of the sheet bundle, the pressure roller is raised by the guide member, and is further folded from the upper surface of the fold. Two slide shafts are used to move the rollers.

Thus, in the invention described in the cited document 1, the guide shaft is used as a guide member for the movement of the pressure roller that moves along the back (fold) of the sheet bundle. In this configuration, when a large load is applied to the pressure roller to strengthen the fold of the sheet bundle, the slide shaft may bend. When the slide shaft is bent in this way, the applied pressure is insufficient at the center of the slide shaft, and it is difficult to stabilize the applied pressure on the sheet bundle.

Accordingly, the problem to be solved by the present invention is to stabilize the applied pressure when the saddle-stitched sheet bundle is folded back and folded.

  In order to solve the above-described problem, an aspect of the present invention provides a sheet processing apparatus including: a pressing unit that presses a fold portion of a sheet bundle; and a moving unit that reciprocates the pressing unit in a direction parallel to the fold portion. A guide shaft for guiding the movement of the moving means, and a supporting means for supporting the pressing means from below the pressing means and rotating on the structure of the sheet processing apparatus. And

According to one aspect of the present invention, the applied pressure can be stabilized when the saddle stitched sheet bundle is folded back and folded. Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

1 is a diagram illustrating a system configuration of an image processing system including an image forming apparatus and a plurality of sheet processing apparatuses according to an embodiment of the present invention. FIG. 6 is an operation explanatory diagram of the saddle stitch bookbinding apparatus and shows a state when the sheet bundle is carried into a half-fold conveyance path. FIG. 9 is an operation explanatory diagram of the saddle stitch bookbinding apparatus, and shows a state at the time of saddle stitching of a sheet bundle. FIG. 5 is an operation explanatory diagram of the saddle stitch bookbinding apparatus and shows a state when the movement to the center folding position of the sheet bundle is completed. FIG. 5 is an operation explanatory diagram of the saddle stitch bookbinding apparatus and shows a state when a sheet bundle is folded in a middle. FIG. 9 is an operation explanatory diagram of the saddle stitch bookbinding apparatus and shows a state at the time of paper discharge after the end of folding of a sheet bundle. It is a principal part front view which shows the basic composition of an additional folding roller unit and a folding roller pair. It is the principal part side view which looked at FIG. 7 from the left side. It is a figure which shows the detail of a guide member. It is a figure which expands and shows the principal part of FIG. 9, and shows a state when the route switching claw is not switched. It is a figure which expands and shows the principal part of FIG. 9, and shows the state by which the 1st path | route switching nail | claw was switched. It is operation | movement explanatory drawing which shows the initial state of an additional folding operation | movement. It is operation | movement explanatory drawing which shows the state at the time of the forward movement start of an additional folding roller unit. FIG. 12 is an operation explanatory diagram illustrating a state when the third folding path is reached near the center of the sheet bundle of the additional folding roller unit. It is operation | movement explanatory drawing which shows a state when an additional folding roller unit pushes the 1st path | route switching nail | claw and enters into a 2nd guidance path | route. FIG. 10 is an operation explanatory diagram illustrating a state when the additional folding roller unit moves in the end direction while pressing the sheet bundle. It is operation | movement explanatory drawing which shows a state when an additional folding roller unit moves to the final position of an outward movement along the 2nd guidance path | route. It is operation | movement explanatory drawing which shows a state when an additional folding roller unit starts a backward movement from the last position of a forward movement. It is operation | movement explanatory drawing which shows a state when an additional folding roller unit starts a backward movement, and has reached the 6th guidance path | route. It is operation | movement explanatory drawing which shows a state when an additional folding roller unit reaches the 6th guidance path | route and transfers to a press state from a press release state. It is operation | movement explanatory drawing which shows a state when it will be in a perfect press state, if an additional folding roller unit enters the 6th guidance 5th guidance path | route. It is operation | movement explanatory drawing which shows a state when an additional folding roller unit moves to a 5th guide path | route as it is, and returned to the initial position. It is a front view of the additional folding unit which concerns on embodiment of this invention. It is a right view of FIG. It is a principal part perspective view which shows the moving mechanism of an additional folding roller unit. It is explanatory drawing which shows a state when pressurizing a sheet bundle with an additional folding roller unit. It is a figure which shows the example which made the moving mechanism of the additional folding roller unit self-propelled. It is a figure which shows the example which made the moving mechanism of the additional folding roller unit the slide movement system.

The present invention is characterized in that not only the guide shaft but also the guide shaft and the housing are used to guide and support the roller for the movement of the roller that folds the back of the saddle stitched sheet bundle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram illustrating a system configuration of an image processing system including an image forming apparatus and a plurality of sheet processing apparatuses according to the present exemplary embodiment. In the present embodiment, the first and second sheet post-processing apparatuses 1 and 2 are connected in this order at the subsequent stage of the image forming apparatus PR.

The first sheet post-processing apparatus 1 is a sheet post-processing apparatus having a sheet bundle creating function for receiving sheets one by one from the image forming apparatus PR, sequentially superposing and aligning them, and creating a sheet bundle in a stack unit. The sheet bundle is discharged from the discharge roller 10 to the second sheet processing apparatus 2 at the subsequent stage. The second sheet post-processing apparatus 2 is a saddle stitch bookbinding apparatus that receives a conveyed sheet bundle and performs saddle stitching and folding (in this specification, the second sheet post-processing apparatus is also referred to as a saddle stitch bookbinding apparatus). Called).

The saddle stitch bookbinding apparatus 2 discharges the bound booklet (sheet bundle) as it is or discharges it to a subsequent sheet processing apparatus. The image forming apparatus PR forms a visible image on a sheet-like recording medium based on input image data or image data of a read image. For example, a copier, a printer, a facsimile machine, or a digital multifunction machine having at least two of these functions corresponds to this. The image forming apparatus PR is a known system such as an electrophotographic system or a droplet ejection system, and any image forming system may be used.

In the figure, the saddle stitch bookbinding apparatus 2 includes an entrance conveyance path 241, a sheet through conveyance path 242, and a center folding conveyance path 243. In the most upstream portion in the sheet conveyance direction of the entrance conveyance path 241,
An entrance roller 201 is provided, and the sheet bundle discharge roller 10 of the first sheet post-processing apparatus 1 is provided.
The aligned sheet bundle is carried into the apparatus. In the following description, the upstream side in the sheet conveyance direction is simply referred to as the upstream side, and the downstream side in the sheet conveyance direction is simply referred to as the downstream side.

A branching claw 202 is provided on the downstream side of the inlet roller 201 in the inlet conveyance path 241. The branching claw 202 is installed in the horizontal direction in the figure, and branches the sheet bundle conveyance direction to the sheet-through conveyance path 242 or the half-fold conveyance path 243. The sheet through conveyance path 242 is
This is a conveyance path that extends horizontally from the entrance conveyance path 241 and guides the sheet bundle to a processing apparatus (not shown) or a sheet discharge tray, which is not shown, and the sheet bundle is discharged to the subsequent stage by the upper discharge roller 203. The middle folding conveyance path 243 extends vertically downward from the branch claw 202 and is a conveyance path for performing saddle stitching and middle folding processing on the sheet bundle.

The middle folding conveyance path 243 includes a bundle conveyance guide plate upper 207 that guides the sheet bundle at the upper part of the folding plate 215 for folding in, and a lower bundle conveyance guide plate 208 that guides the sheet bundle at the lower part of the folding plate 215. I have. On the bundle conveying guide plate 207, an upper bundle conveying roller 205, a rear end tapping claw 221 and a lower bundle conveying roller 206 are provided from above. Rear end tapping nail 22
1 is erected on a rear end tapping claw driving belt 222 driven by a driving motor (not shown). The trailing edge tapping claw 221 strikes (presses) the trailing edge of the sheet bundle toward the movable fence described later by the reciprocating rotation operation of the trailing edge tapping drive belt 222, and performs the sheet bundle alignment operation. Also,
When the sheet bundle is carried in and when the sheet bundle is raised for the middle folding, the sheet is retracted from the middle folding conveyance path 243 on the bundle conveyance guide plate 207 (a broken line position in FIG. 1).

Reference numeral 294 denotes a rear end tapping claw HP sensor for detecting the home position of the rear end tapping claw 221, and detects the position of the broken line in FIG. 1 (solid line position in FIG. 2) retracted from the intermediate folding conveyance path 243 as the home position. The rear end tapping claw 221 is controlled based on this home position.

A saddle stitching stapler S1, a saddle stitching jogger fence 225, and a movable fence 210 are provided on the lower bundle conveyance guide plate 208 from above. The lower bundle conveyance guide plate 208 is a guide plate that receives the sheet bundle conveyed through the upper bundle conveyance guide plate 207. The pair of saddle stitch jogger fences 225 is installed in the width direction, and the leading end of the sheet bundle is disposed below. Abut (
The movable fence 210 is provided so as to be movable up and down.

The saddle stitching stapler S1 is a stapler that binds the central portion of the sheet bundle. Movable fence 2
10 is moved in a vertical direction while supporting the leading end of the sheet bundle, and the center position of the sheet bundle is positioned at a position facing the saddle stitching stapler S1, and stapling, that is, saddle stitching is performed at that position. The movable fence 210 is supported by the movable fence drive mechanism 210a and is movable from the position of the movable fence HP sensor 292 in the upper part of the drawing to the lowest position. The movable range of the movable fence 210 with which the front end of the sheet bundle abuts ensures a stroke that can be processed from the maximum size that can be processed by the saddle stitch binding apparatus 2 to the minimum size. In addition,
For example, a rack and pinion mechanism is used as the movable fence driving mechanism 210a.

A folding plate 215, a pair of folding rollers 230, an additional folding roller unit 260, and a lower paper discharge roller 231 are provided between the upper and lower bundle conveying guide plates 207, that is, substantially at the center of the intermediate folding conveying path 243. Yes. The additional folding roller unit 260 includes the folding roller pair 23.
An upward folding roller is disposed across a paper delivery path between the 0 and the lower paper delivery rollers 231. The folding plate 215 can reciprocate in the horizontal direction shown in the drawing, and the nip of the pair of folding rollers 230 is positioned in the operation direction when performing the folding operation, and the paper discharge conveyance path 244 is installed on the extension. . The lower paper discharge roller 231 is provided on the most downstream side of the paper discharge conveyance path 244 and discharges the sheet bundle that has been folded to the subsequent stage.

A sheet bundle detection sensor 291 is provided on the lower end side of the upper bundle conveyance guide plate 207 and detects the leading edge of the sheet bundle that is carried into the middle folding conveyance path 243 and passes the middle folding position. In addition, a fold portion passage sensor 293 is provided in the paper discharge conveyance path 244, and detects the leading end of the folded sheet bundle and recognizes the passage of the sheet bundle.

In general, in the saddle stitch bookbinding apparatus 2 configured as shown in FIG. 1, the saddle stitching and folding operation is performed as shown in the operation explanatory diagrams of FIGS. That is, when the saddle stitching middle fold is selected from the operation panel (not shown) of the image forming apparatus PR, the sheet bundle for which the saddle stitching middle fold is selected is fed to the half-fold conveyance path by the counterclockwise biasing operation of the branching claw 202. Guided to the H.243 side. The branching claw 202 is driven by a solenoid. Note that a motor drive may be used instead of the solenoid.

The sheet bundle SB carried into the middle folding conveyance path 243 is conveyed downward through the middle folding conveyance path 243 by the entrance roller 201 and the bundle conveyance roller 205, and is confirmed to pass by the sheet bundle detection sensor 291. As shown in FIG. 2, the sheet is conveyed to a position where the leading end of the sheet bundle SB contacts the movable fence 210 by the lower bundle conveying roller 206. At that time, the image forming apparatus PR
The movable fence 210 stands by at a different stop position according to the sheet size information from here, here, the size information in the conveying direction of each sheet bundle SB. At this time, in FIG. 2, the lower bundle conveying roller 206 holds the sheet bundle SB in the nip, and the rear end tapping claw 221 is waiting at the home position.

In this state, as shown in FIG. 3, the nipping pressure of the lower bundle conveying roller 206 is released (in the direction of arrow a), and the front end of the sheet bundle comes into contact with the movable fence 210 and the rear end becomes free. Then, the trailing edge tapping claw 221 is driven, and the trailing edge of the sheet bundle SB is hit to perform final alignment in the conveying direction (direction of arrow c).

Next, the alignment operation in the width direction (direction orthogonal to the sheet conveyance direction) is performed by the saddle stitching jogger fence 225, and the alignment operation in the conveyance direction is performed by the movable fence 210 and the trailing edge hitting claws 221. The alignment operation of the SB width direction and the conveyance direction is completed. At this time, according to the sheet size information, the sheet bundle number information, and the sheet bundle thickness information,
The pushing amount of the rear end tapping claw 221 and the saddle stitching jogger fence 225 is changed to an optimum value and matched.

In addition, if the bundle is thick, the space in the transport path is reduced, and there are many cases where alignment cannot be performed by a single alignment operation. Therefore, in such a case, the number of matching is increased. Thereby, a better alignment state can be realized. Furthermore, since the time for sequentially stacking sheets on the upstream side increases as the number of sheets increases, the time until the next sheet bundle SB is received becomes longer. As a result, even if the number of times of matching is increased, there is no time loss as a system, so that a good matching state can be realized efficiently. Therefore, depending on the upstream processing time,
It is also possible to control the number of alignments.

The standby position of the movable fence 210 is normally set to a position where the saddle stitching position of the sheet bundle SB faces the binding position of the saddle stitching stapler S1. This is because if the alignment is performed at this position, the movable fence 210 can be bound as it is at the stacked position without being moved to the saddle stitching position of the sheet bundle SB. Therefore, at this standby position, the stitcher of the saddle stitching stapler S1 is driven in the center of the sheet bundle SB in the direction of arrow b, the binding process is performed with the clincher, and the sheet bundle SB is saddle stitched.

The movable fence 210 is positioned by pulse control from the movable fence HP sensor 292, and the rear end tapping claw 221 is positioned by pulse control from the rear end tapping claw HP sensor 294. Positioning control of the movable fence 210 and the trailing edge tapping claw 221 is performed by the saddle stitch bookbinding apparatus 2.
Is executed by a CPU of a control circuit (not shown).

The sheet bundle SB that has been saddle-stitched in the state of FIG. 3 is in a state of being saddle-stitched (sheet bundle S) as the movable fence 210 is moved upward in a state where the pressure of the lower bundle conveying roller 206 is released as shown in FIG.
B is moved to a position facing the folding plate 215 in the conveying direction of B). This position is also controlled based on the detection position of the movable fence HP sensor 292.

When the sheet bundle SB reaches the position of FIG. 4, the folding plate 215 moves in the nip direction of the pair of folding rollers 230 as shown in FIG. 5, and the sheet bundle SB near the stapled portion of the sheet bundle SB is bound.
To the nip side and push out to the nip side. The sheet bundle SB is pushed by the folding plate 215, guided to the nip of the folding roller pair 230, and pushed into the nip of the folding roller pair 230 that has been rotated in advance. The pair of folding rollers 230 pressurizes and conveys the sheet bundle SB pushed into the nip. By this pressurizing and conveying operation, folding is performed at the center of the sheet bundle SB to form a simple bound sheet bundle SB. FIG. 5 shows the fold portion SB of the sheet bundle SB.
1 shows a state in which the tip of 1 is sandwiched and pressed by the nip of the folding roller pair 230.

In the state of FIG. 5, the sheet bundle SB whose center is folded in half is the sheet bundle SB as shown in FIG. 6.
As a pair of folding rollers 230, and further sandwiched by the lower paper discharge roller 231 and discharged to the subsequent stage. At this time, when the rear end of the sheet bundle SB is detected by the fold portion passage sensor 293, the folding plate 215 and the movable fence 210 are returned to the home position, and the lower bundle conveying roller 206 is returned to the pressurized state. Prepare for carrying in SB. If the next job is the same number and the same number of sheets, the movable fence 210 may be moved again to the position shown in FIG. These controls are also executed by the CPU of the control circuit.

7 is a main part front view showing the basic configuration of the additional folding roller unit and the pair of folding rollers, and FIG. 8 is a side view of the main part when FIG. 7 is viewed from the left side. The additional folding roller unit 260 includes the folding roller pair 2
30 and a lower paper discharge roller 231, which is installed in a paper discharge transport path 244, and is provided with a unit moving mechanism 26.
3. A guide member 264 and a pressing mechanism 265 are provided. The unit moving mechanism 263 reciprocates the additional folding unit 260 along the guide member 264 in the illustrated depth direction (direction perpendicular to the sheet conveying direction) by a driving source and a driving mechanism (not shown). The pressing mechanism 265 is a mechanism that applies pressure from above and below to press the sheet bundle SB, and includes an additional folding roller / upper unit 261 and an additional folding roller / lower unit 262.

The additional folding roller / upper unit 261 has a supporting member 26 with respect to the unit moving mechanism 263.
The additional folding roller / lower unit 262 is supported by the lower end of the support member 265b of the pressing mechanism 265 so as not to move. The additional folding roller / upper 261a of the additional folding roller / upper unit 261 can be pressed against the additional folding roller / lower 262a, and presses the sheet bundle SB between the nips thereof. The pressing force is applied by a pressurizing spring 265c that pressurizes the additional folding roller / upper unit 261 with an elastic force. Then, in the pressurized state, the sheet bundle SB moves in the width direction (direction of arrow D1 in FIG. 8) as will be described later, and additional folding is performed on the fold portion SB1.

FIG. 9 is a diagram showing details of the guide member 264. The guide member 264 includes a guide path 270 that guides the additional folding roller unit 260 in the width direction of the sheet bundle SB.
Is
1) A first guide path 271 that guides the pressing mechanism 265 in a released state during forward movement
2) Second guide path 272 for guiding the pressing mechanism 265 in a pressed state during forward movement
3) The third guide path 27 that switches the pressing hand 265 from the pressing release state to the pressing state during the forward movement.
3
4) A fourth guide path 274 for guiding the pressing mechanism 265 in the pressed release state during the backward movement.
5) A fifth guide path 275 for guiding the pressing mechanism 265 in a pressed state during the backward movement.
6) Sixth guide path 2 for switching the pressing mechanism 265 from the pressing release state to the pressing state during the backward movement.
76
These six routes are set.

10 and 11 are enlarged views showing the main part of FIG. As shown in FIGS. 10 and 11, the first route switching claw is provided at the intersection of the third guide route 273 and the second guide route 272 and at the intersection of the sixth guide route 276 and the fifth guide route 275, respectively. 277 and a second path switching claw 278 are installed. The first path switching claw 277 is a third one as shown in FIG.
Can be switched from the second guide route 273 to the second guide route 272, the second route switching claw 27
8 can be switched from the sixth guide route 276 to the fifth guide route 275. But,
In the former, switching from the second guide route 272 to the third guide route 273 is impossible, and in the latter, switching from the fifth guide route 275 to the sixth guide route 276 is impossible. That is,
It is configured not to be switched in the reverse direction. In addition, the arrow in FIG. 11 has shown the movement locus | trajectory of the guide pin 265a.

The reason why the pressing mechanism 265 moves along the guide path 270 is that the guide pin 265a of the pressing mechanism 265 is movably fitted in the guide path 270 in a loose fit state. That is, the guide path 270 functions as a cam groove and functions as a cam follower that changes its position while the guide pin 265a moves along the cam groove.

12 to 22 are operation explanatory views of the additional folding operation by the additional folding roller unit in this embodiment.

FIG. 12 shows a state in which the sheet bundle SB folded by the folding roller pair 230 is conveyed to a preset additional folding position and stopped, and the additional folding roller unit 260 is in the standby position. This state is the initial position of the additional folding operation.

From the initial position (FIG. 12), the additional folding roller unit 260 moves in the right direction (in the direction of arrow D2).
The forward movement is started (FIG. 13). At that time, the pressing mechanism 2 in the additional folding roller unit 260.
65 moves along the guide path 270 of the guide member 264 by the action of the guide pin 265a. Immediately after the operation is started, the vehicle moves along the first guide route 271. At that time, the pair of additional folding rollers 261a and 262a is in a pressed release state. Here, in the pressed release state, the additional folding roller pair 261a, 262a and the sheet bundle SB are in contact with each other but almost no pressure is applied, or the additional folding roller pair 261a, 262a is separated from the sheet bundle SB. Represents a state. The additional folding roller pair 261a, 262a is a pair of additional folding roller / upper 26.
1a and an additional folding roller / lower 262a.

When the third guide path 273 is reached near the center of the sheet bundle SB (FIG. 14), the pressing mechanism 26
5 starts to descend along the third guide path 273, and pushes the first path switching claw 277 to enter the second guide path 272 (FIG. 15). At this time, the pressing mechanism 265 is in a state of pressing the additional folding roller / upper unit 261, and the additional folding roller / upper unit 261 is in contact with the sheet bundle SB and is in a pressing state.

The additional folding roller unit 260 further moves in the direction of the arrow D2 while being pressed (FIG. 16). At this time, since the second path switching claw 278 cannot move in the reverse direction,
Without being guided by the guide route 276, it moves along the second guide route 272, exits the sheet bundle SB, and is positioned at the final position of the forward movement (FIG. 17). When moved so far, the guide pin 265a of the pressing mechanism 265 moves from the second guide path 272 to the upper fourth guide path 274. As a result, the restriction of the position of the guide pin 265a by the upper surface of the second guide path 272 is released, so that the additional folding roller / upper 261a is separated from the additional folding roller / lower 262a and is in a pressed release state.

Next, the additional folding roller unit 260 starts moving backward by the unit moving mechanism 263 (FIG. 18). In the backward movement, the pressing mechanism 265 moves along the fourth guide path 274 in the left direction (arrow D3 direction) in the figure. By this movement, the pressing mechanism 265 moves to the sixth guide path 27.
When reaching 6 (FIG. 19), the guide pin 265a is pushed downward along the shape of the sixth guide path 276, and the pressing mechanism 265 shifts from the pressed release state to the pressed state (FIG. 20). The pressing start position during the backward movement is on the near side of the pressing start position during the forward movement.

Then, when entering the fifth guide route 275, it is completely pressed, and the fifth guide route 27
5 is moved in the direction of arrow D3 as it is (FIG. 21), and leaves the sheet bundle SB (FIG. 22).

In this way, the additional folding roller unit 260 is reciprocated to perform additional folding on the sheet bundle SB. At that time, additional folding from the center of the sheet bundle SB to one side is started, and the sheet bundle SB is started.
Through one end SB2. Thereafter, the sheet is passed over the additionally folded sheet bundle SB, and the folding from the center part of the sheet bundle to the other side is started, and the additional folding is performed by the operation of exiting the other end part SB2.

When operated in this manner, when the folding is started again or when one side is pulled out and then returned to the other side, the additional folding roller pair 261 is moved from the outside of the sheet bundle SB to the end portion SB2 of the sheet bundle SB.
a and 262a are not in contact with each other and are not pressurized. That is, the end S of the sheet bundle SB
When passing through B2 from the outside of the end portion, the additional folding roller unit 260 is in a pressed release state. Therefore, damage to the end portion SB2 of the sheet bundle SB does not occur. Further, since the sheet SB is further folded from the vicinity of the center of the sheet bundle SB to the end SB, the distance traveled by contacting the sheet bundle SB at the time of additional folding is shortened, and wrinkles that cause wrinkles and the like are not easily accumulated. for that reason,
When the fold portion (back) SB1 of the sheet bundle SB is further folded, the end portion SB2 of the sheet bundle SB is not damaged, and the generation of wrinkles and wrinkles in the vicinity of the fold portion SB1 due to accumulation of wrinkles is also suppressed. can do.

In order to prevent the additional folding roller pair 261a, 262a from riding on the end portion SB2 from the outside of the end portion SB2 of the sheet bundle SB, the operation is performed as can be seen from FIGS. That is, assuming that the distance that the additional folding roller unit 260 moves on the sheet bundle when the pressure is released during the forward movement is La, and the distance that the sheet bundle is moved while the pressure is released when the backward movement is Lb, the sheet bundle is Lb. The relationship between the length L in the width direction and the distances La and Lb is as follows:
L> La + Lb
It is essential (FIGS. 12 to 14 and FIGS. 17 to 19).

Further, it is desirable that the distances La and Lb are set to be substantially the same, and pressing is started in the vicinity of the central portion in the width direction of the sheet bundle SB (FIGS. 16 and 20).

In the additional folding roller unit 260 in this embodiment, the additional folding roller / lower unit 262 is prepared and the additional folding roller pair 261a, 262a performs additional folding. However, the additional folding roller / lower unit 262 is deleted. , Additional folding roller / upper unit 26
1 and a receiving member (not shown) having an abutting surface facing the first member may be provided so as to press between them.

Further, in the additional folding roller unit 260 in the present embodiment, the additional folding roller / upper unit 261 is configured to be movable up and down, and the additional folding roller / lower unit 262 is configured not to move in the vertical direction. The roller / lower unit 262 can also be configured to be movable in the vertical direction. With this configuration, the additional folding roller pair 261a, 262a moves toward and away from the additional folding position symmetrically, so that the additional folding position becomes constant regardless of the thickness of the sheet bundle SB, and damage such as scratches is further suppressed. can do.

FIG. 23 is a front view of the additional folding roller unit 260 according to this embodiment, and FIG. 24 is a right side view of FIG. The additional folding roller unit 260 shown in FIG. 23 and FIG. 24 has the same basic structure as the additional folding roller unit 260 shown in FIG. 7 and FIG. In addition, overlapping explanation is omitted.

In FIGS. 23 and 24, the additional folding roller unit 260 includes the additional folding roller / lower 262.
A roller holder 262b that holds a fixed in the vertical direction and a moving roller 262m attached to the roller holder 262b are provided at the lower end.

FIG. 25 is a principal perspective view showing the unit moving mechanism 263 of the additional folding roller unit 260. As described above, the unit moving mechanism 263 reciprocates the additional folding roller unit 260 along the guide member 264 in the illustrated depth direction (a direction perpendicular to the sheet conveying direction) by a driving source and a driving mechanism (not shown).

The additional folding roller unit 260 moves along the guide member 264, and the reciprocating movement is guided by the upper and lower guide shafts 280a and 280b. That is, the unit moving mechanism 263 includes the upper and lower guide shafts 280a, 280 in addition to the guide member 264.
0b and upper and lower drive belts 281a, 281b composed of timing belts
And a pair of left and right upper and lower pulleys 282a and 282b in the drawing for driving the drive belts 281a and 281b, and a connecting shaft 283 for coaxially connecting them. In FIG. 25, the left pulley and the connecting shaft are not shown. Upper and lower pulleys 2
82a and 282b and the connecting shaft 283 are driven by a motor (not shown) to drive the upper and lower drive belts 281a and 281b in synchronization.

Further, the additional folding roller unit 260 includes upper and lower slider members 263a1, 2.
63a2 is provided, and the belt engagement portion 26 is connected to the upper and lower drive belts 281a and 281b.
3b1 and 263b2 mesh with each other. Thus, when the upper and lower pulleys 282a and 282b are driven by a motor (not shown), the driving belts 281a and 281b are synchronized with the rotation of the pulleys 282a and 282b in the width direction of the sheet bundle SB (in the direction of the arrow D4 in the drawing). Move back and forth.

On the other hand, the upper slider member 263a1 is slidably mounted on the upper guide shaft 280a, and is held in a state where the movement direction is guided. Similarly, the roller holder 262b can also be moved in the left-right direction by the lower drive belt 281b. Lower slider member 26
3a2 is slidably mounted on the lower guide shaft 280b, and the upper slider member 263 is mounted.
It is held in a state where the moving direction is guided in the same manner as a1. The lower slider member 2
63a2 is provided as a part of the roller holder 262b.

The moving roller 262m, which is a rotating member attached to the lower part of the roller holder 262b,
The upper surface of the stay 284 is in contact with the upper surface of the stay 284, which is a part of the structure of the saddle stitch binding apparatus 2, and rolls on the upper surface of the stay 284 while receiving the weight of the additional folding roller unit 260. As a result, when the additional folding roller unit 260 moves in the direction of the arrow D4 in the drawing as the driving belts 281a and 281b move, the moving roller 262m can roll on the stay 284 and move smoothly.

As described above, in the present embodiment, the roller holder 262b is supported and guided only by the lower guide shaft 280b and not by the guide shaft 280b and the stay 284. Thus, by supporting the additional folding roller unit 260 with three members, the load can be dispersed and the load applied to the guide shaft 602 can be reduced. As a result, it is possible to prevent the upper and lower guide shafts 280a and 280b from being bent. Thereby, insufficient pressurization due to bending of the upper and lower guide shafts 280a and 280b can be prevented, and the pressurization can be stabilized.

FIG. 26 is an explanatory diagram showing a state when the additional folding roller unit 260 presses the sheet bundle SB. As shown in the figure, the moving roller 262m has upper and lower guide shafts 280a,
It is arranged on the upstream side in the sheet conveying direction from 280b. With this arrangement, the sheet bundle SB is pressed between the moving roller 262m and the guide shafts 280a and 280b. When pressed in this arrangement, the load distribution becomes larger on the moving roller 262m side, and a large load can be received by the stay 284. When a large load is received on the stay 284 side, only a small load is applied to the guide shafts 280a and 280b. Therefore, the guide shaft 602 can be prevented from bending, and a shortage of the applied pressure can be prevented to stabilize the applied pressure. It becomes possible to make it.

In the example shown in FIG. 25, the driving belts 281a and 281b are driven to reciprocate the additional folding roller unit 260. However, the moving roller 2 is replaced with the driving belts 281a and 281b.
62m can be motor driven and can be self-propelled. FIG. 27 is a schematic view showing this example. In the example shown in FIG. 27, a driving motor 262n is mounted in the roller holder 262b, and this driving force is transmitted to both wheels of the moving roller 262m via a driving force transmission mechanism 262p using a timing belt and a pulley. Like to do. When configured in this way,
The moving mechanism of the additional folding roller unit 260 can be configured with a simpler configuration than the example shown in FIG.

FIG. 28 is a main part perspective view showing another example of the unit moving mechanism 263 of the additional folding roller unit 260.

In the example shown in FIG. 25, the moving roller 262m is configured to roll on the stay 284, but a slide moving method may be used instead of the rolling method using the roller.
This example is shown in FIG. In the example shown in FIG. 28, the side plate on the upstream side in the sheet bundle conveying direction of the roller holder 262b in FIG. 25 is used as the slide member 262q, and directly contacts the stay 284 as the slide portion 262q1 that moves by sliding the lower end surface. Are arranged as follows. Accordingly, the slide member 262q of the roller holder 262b can be moved while sliding on the stay 284 after receiving the load of the additional folding roller unit 260. In order to prevent a concentrated load at the sliding portion 262q1, it is preferable that the sliding portion 262q1 has a certain length. In addition, in order to reduce the frictional force, a resin coating is applied,
Alternatively, it may be coated with a metal having a small friction coefficient.

If comprised in this way, since the bearing which supports the moving roller 262m and the moving roller 262m rotatably is unnecessary, cost reduction is attained.

  As described above, according to the present embodiment, the following effects can be obtained.

1) An additional folding roller unit 260 (pressing means) that presses and folds the fold portion SB1 of the folded sheet bundle SB, and a unit moving mechanism 263 that reciprocates the additional folding roller unit 260 in the width direction of the sheet bundle SB. An upper and lower guide shafts 280a, 280b (guide shafts) that support the additional folding roller unit 260 and guide the movement. , Additional folding roller unit 26
A moving roller 262 that supports 0 and moves on the stay 284 (structure) of the saddle stitch bookbinding apparatus 2.
m (support means), the load of the additional folding roller unit 260 can be received by the guide shafts 280a and 280b and the stay 284, and the guide shafts 280a and 280b can be prevented from bending. . As a result, it is possible to prevent insufficient pressure force due to bending of the guide shafts 280a and 280b, and to stabilize the pressure force when the fold portion SB1 (back) of the saddle stitched sheet bundle SB (booklet) is further folded. .

2) The additional folding roller unit 260 includes the additional folding roller / upper unit 261 (first pressing portion) and the additional folding roller / lower unit 2 facing the additional folding roller / upper unit 261.
62 (second pressing part), and the additional folding roller / upper unit 261 pressurizes the additional folding roller / upper unit 261 in the direction of the additional folding roller / lower unit 262 (second pressing part direction). Since the spring 265c (pressure member) is provided and the additional folding roller / lower unit 262 includes the moving roller 262m, the folding portion of the sheet bundle SB is formed by the additional folding roller / upper unit 261 and the additional folding roller / lower unit 262. The sheet bundle SB can be moved in the width direction after pressurizing SB1.

3) The guide shaft is an upper guide shaft 280 for guiding the additional folding roller / upper unit 261.
a (first guide shaft) and the lower guide shaft 280b (second guide shaft) for guiding the additional folding roller / lower unit 262, the additional folding roller unit 260 is moved in a stable state with high accuracy. Can be made.

4) Since the moving roller 262m (supporting means) which is a rotating member rolls on the stay 284, it can be moved with a low load.

5) Since a plurality of moving rollers 262m (supporting means) are provided, it is possible to disperse the load and to improve running stability during movement.

6) Since the additional folding roller unit 260 includes a driving motor 262n that drives and moves the moving roller 262m and a driving force transmission mechanism 262p (driving means), no driving mechanism is required outside the additional folding roller unit 260. The size of the apparatus can be reduced.

7) Since the slide member 262q that slides on the stay 284 is used as the support means instead of the moving roller 262m, the cost can be reduced.

8) The moving roller 262m or the slide member 262q is guided by the guide shafts 280a and 280b.
Is disposed on the upstream side in the conveying direction of the sheet bundle SB with respect to the arrangement position of the moving roller 26.
A load is applied to 2 m or the slide member 262q side, and the load on the guide shafts 280a and 280b can be reduced. As a result, the bending of the guide shafts 280a and 280b is reduced, and the pressure applied to the fold portion SB1 can be stabilized.

9) The additional folding roller unit 260 starts pressing from a preset position in the width direction of the sheet bundle SB (near the center of the sheet width) when moving forward, and moves one end SB2 of the sheet bundle SB. When the sheet bundle SB is released, when the sheet bundle SB is pressed, the pressing is started from a position before the preset position when the carriage moves backward, and the other end SB2 of the sheet bundle SB is released. When the sheet bundle SB moves from the outside of the end portion SB2 of the sheet bundle SB, the pressing state is always released, and the sheet bundle end portion SB2 may be damaged when the fold portion SB1 of the sheet bundle is further folded. Absent. Further, since the entire region in the width direction of the sheet bundle is not folded at a time, the generation of wrinkles and wrinkles in the crease portion and the vicinity thereof due to the accumulation of wrinkles can be suppressed.

In the claims, the sheet bundle is denoted by SB in the present embodiment, the fold portion is denoted by SB1, the pressing means is the additional folding roller unit 260, and the moving means is the unit moving mechanism 2.
63, the sheet processing apparatus is the saddle stitch bookbinding apparatus 2, and the guide shafts are the upper and lower guide shafts 28.
0a and 280b, the structure is the stay 284, the support means is the moving roller 262m, the first pressing portion is the additional folding roller / upper unit 261, the second pressing portion is the additional folding roller / lower unit 262, The pressure member is the pressure spring 265c, the first guide shaft is the upper guide shaft 280a, the second guide shaft is the lower guide shaft 280b, the drive means is the drive motor 262n and the drive force transmission mechanism 262p, the seat The end of the bundle corresponds to the reference numeral SB2, and the image forming system corresponds to a system including the saddle stitch bookbinding apparatus 2 and the image forming apparatus PR.

Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention, and all the technical matters included in the technical idea described in the claims are all included. The subject of the present invention. The above embodiment shows a preferable example, but those skilled in the art can realize various alternatives, modifications, variations, and improvements from the contents disclosed in this specification, These are included in the technical scope described in the appended claims.

2 Saddle stitch bookbinding apparatus 260 Additional folding roller unit 261 Additional folding roller / upper unit 262 Additional folding roller / lower unit 262m Moving roller 262n Driving motor 262p Driving force transmission mechanism 262q Slide member 263 Unit moving mechanism 265c Pressure spring 280a Upper guide shaft 280b Lower guide shaft 284 Stay PR Image forming apparatus SB Sheet bundle SB1 Crease SB2 End of sheet bundle

JP 2009-190824 A

Claims (10)

A pressing means for pressing a fold portion of the sheet bundle;
Moving means for reciprocating the pressing means in a direction parallel to the crease portion;
A sheet processing apparatus comprising:
A guide shaft for guiding the movement of the moving means;
Supporting means for supporting the pressing means from below the pressing means, and rotating on the structure of the sheet processing apparatus;
A sheet processing apparatus comprising: A pressing means for pressing a fold portion of the sheet bundle;
Moving means for reciprocating the pressing means in a direction parallel to the crease portion;
A sheet processing apparatus comprising:
A guide shaft for guiding the movement of the moving means;
Supporting means for supporting the pressing means from the side opposite to the guide shaft with respect to the pressing means, and rotating the structure on the sheet processing apparatus;
A sheet processing apparatus comprising: The sheet processing apparatus according to claim 1 or 2,
The pressing means includes a first pressing portion and a second pressing portion facing the first pressing portion,
The first pressing portion includes a pressing member that pressurizes the first pressing portion in the second pressing portion direction.
The sheet processing apparatus, wherein the second pressing portion includes the support means. The sheet processing apparatus according to claim 3,
The sheet processing apparatus, wherein the guide shaft includes a first guide shaft that guides the first pressing portion and a second guide shaft that guides the second pressing portion. The sheet processing apparatus according to any one of claims 1 to 4,
The sheet processing apparatus according to claim 1, wherein the supporting unit includes a rotating member that rolls on a predetermined portion on the structure. The sheet processing apparatus according to any one of claims 1 to 5,
A sheet processing apparatus comprising a plurality of the support means. The sheet processing apparatus according to claim 5,
The sheet processing apparatus according to claim 1, wherein the pressing unit includes a driving unit that drives the rotating member to move the supporting unit. The sheet processing apparatus according to any one of claims 1 to 7,
The sheet processing apparatus, wherein the support means is disposed upstream of the guide shaft in the sheet bundle conveyance direction. The sheet processing apparatus according to any one of claims 1 to 8,
The pressing means is
Start pressing from a preset position in the width direction of the sheet bundle when moving forward, after exiting one end of the sheet bundle, release the pressure,
A sheet processing apparatus, wherein when the sheet is moved backward, pressing starts from a position before the preset position, and the other end of the sheet bundle is removed. An image forming system comprising the sheet processing apparatus according to claim 1.