JP2023082601A - Square back shaping apparatus - Google Patents

Abstract

To provide a square back shaping apparatus which can shorten time required for shaping a square back.SOLUTION: A square back shaping apparatus comprises: a square back roller 306 which can move in a predetermined direction; a clamper 304 which holds a booklet so that the back is pressurized when a longitudinal direction of the back coincides with a moving direction of the square back roller 306 and the square back roller 306 moves in the predetermined direction; and a control unit which moves the square back roller 306 from a start position to an end position in a state in which the clamper 304 holds the booklet. At least one of the start position and the end position is a position according to length of the back of the booklet.SELECTED DRAWING: Figure 4

Description

The present invention relates to a square spine forming apparatus.

Patent Literature 1 discloses an apparatus that folds a bundle of sheets into two at a bound position to create a booklet, presses a roller against the spine of the booklet, and moves it to finish the booklet into a square spine. In this device, the spine of a booklet conveyed with the spine leading is brought into contact with a stopper and stopped, gripped by a clamper, the stopper is retracted, and a square spine roller is moved to form a square spine.

Japanese Patent Application Laid-Open No. 2001-260564

In the apparatus disclosed in Patent Document 1, after the corner spine forming is completed, the corner spine roller is made to stand by at a non-operating position at one end of the clamping jaw so that the corner spine roller and the stopper do not interfere with each other. Therefore, when forming the spine of the next booklet, the spine roller starts to move from this non-working position regardless of the spine length of the booklet. When the spine of the booklet is short, the movement distance from when the square spine roller starts to move until it presses against the spine of the booklet becomes long. The distance of useless movement that does not press against the back becomes longer. This hinders shortening of the time required for forming the square spine.

The present invention has been made in such a situation, and one of the exemplary objects of certain aspects thereof is to provide a corner spine forming apparatus capable of shortening the time required for corner spine forming.

In order to solve the above problems, a corner spine forming apparatus according to one aspect of the present invention includes rollers that can move in a predetermined direction, and a spine whose longitudinal direction coincides with the moving direction of the rollers and that the rollers move in a predetermined direction. A clamper that grips the booklet so that the spine is pressed when it moves, and a controller that moves the roller from the start position to the end position while the clamper grips the booklet. At least one of the start position and the end position is a position according to the spine length of the booklet.

Arbitrary combinations of the above constituent elements, and mutual replacement of the constituent elements and expressions of the present invention between methods, devices, systems, etc. are also effective as embodiments of the present invention.

According to the present invention, the time required for forming the square spine can be shortened.

1 is a diagram showing an overall configuration of a bookbinding system according to an embodiment; FIG. FIG. 2 is a side view of the saddle stitch folding device and corner spine forming device of FIG. 1; 2 is a block diagram showing a functional configuration centered on a controller of the bookbinding system according to the embodiment; FIG. 4(a) and 4(b) are diagrams showing an example of a corner spine forming scene by a corner spine forming device. 5(a) and 5(b) are diagrams showing an example of a corner spine forming scene by a corner spine forming apparatus. FIGS. 6A and 6B are diagrams showing an example of a corner spine forming scene by a corner spine forming device. 7(a) and 7(b) are diagrams showing an example of a corner spine forming scene by a corner spine forming apparatus. FIG. 11 is a top view showing a corner spine stopper and corner spine rollers of a corner spine forming device according to a modification;

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on preferred embodiments with reference to the drawings. The embodiments are illustrative rather than limiting the invention, and not all features and combinations thereof described in the embodiments are necessarily essential to the invention. The same or equivalent constituent elements, members, and processes shown in each drawing are denoted by the same reference numerals, and duplication of description will be omitted as appropriate.

FIG. 1 is a block diagram showing the overall configuration of a bookbinding system 10 according to an embodiment. The bookbinding system 10 is a system for performing post-processing on sheets on which characters and images are printed, and includes a sheet feeding device 100, a saddle stitch folding device 200, a spine forming device 300, a cutting device 400, and a stacker 500. , and a control device 600 . The sheet is not particularly limited, but is typically paper.

The sheet feeding device 100 feeds sheets one by one. The saddle stitch folding device 200 performs saddle stitch folding processing on the sheets supplied from the sheet feeding device 100 . Specifically, the saddle stitch folding device 200 creates a sheet bundle by stacking the sheets supplied one by one from the sheet feeding device 100, binds the sheet bundle at the center, and folds the bundle in two at the bound points to form a booklet. create. The square spine shaping device 300 shapes the spine of the booklet created by the saddle stitch folding device 200 into a square shape. The cutting device 400 cuts the fore edge, top, and bottom of the booklet to complete the booklet. A completed booklet is loaded on the stacker 500 . The control device 600 is an information processing terminal such as a PC, and controls the bookbinding system 10 in an integrated manner.

FIG. 2 is a side view schematically showing the saddle stitch folding device 200 and the corner spine forming device 300. As shown in FIG. The sheets are conveyed in the direction in which the saddle stitch folding device 200 and the corner spine forming device 300 are arranged. Hereinafter, the direction in which the sheet is conveyed (the direction from right to left in FIG. 1) will be referred to as the conveying direction Y, and the direction perpendicular to the conveying direction Y (the direction perpendicular to the paper surface in FIG. 1) will be referred to as the width direction X. In addition, regarding the width direction X, the right side in the width direction X when viewed from the upstream side in the transport direction Y is called the right side in the width direction X, and the left side is called the left side in the width direction X. For sheets and booklets, the edge on the downstream side in the transport direction Y is called the leading edge, and the edge on the upstream side is called the trailing edge.

The saddle-stitch folding device 200 includes a binding unit 202 that creates a sheet bundle and binds the sheet bundle, a folding unit 204 that folds the bound sheet bundle at the binding location, and a square spine forming device 300 that folds the folded sheet bundle. and a discharge unit 206 for discharging.

The binding unit 202 includes a conveying mechanism 210 that conveys sheets downstream, a binding stopper 212 , a pair of side guides 214 , a back jogger 216 , and a binding unit 218 . The sheets supplied from the sheet supply device 100 come into contact with the binding stopper 212 and stop, and the sheets are stacked at this position to form a sheet bundle.

A pair of side guides 214 positions the sheet and the sheet bundle in the width direction X. As shown in FIG. Specifically, the pair of side guides 214 are adjustable in width direction X, and are adjusted in advance according to the width of the sheet (e.g., equal to the width of the sheet). The sheet is conveyed between the pair of side guides 214 and is positioned in the width direction X by the pair of side guides 214 before coming into contact with the binding stopper 212 .

The back jogger 216 presses the sheet bundle against the binding stopper 212 a plurality of times by reciprocating a plurality of times between a position a little upstream from the rear end of the sheet bundle and a position abutting the sheet bundle. As a result, the front and rear end surfaces of the sheet bundle are aligned, and the sheet bundle is positioned in the front-rear direction.

The binding unit 218 binds the sheet bundle. Binding unit 218 includes a stitcher 220 and a clincher 222 . A stitcher 220 drives a binding needle into the sheet bundle, and a clincher 222 bends the tip of the driven needle. When the sheet bundle is bound, the binding stopper 212 is lowered and the sheet bundle is conveyed to the folding section 204 .

The folding unit 204 includes transport mechanisms 230 and 231 that transport the sheet bundle downstream, a folding stopper 232, a pair of side guides (not shown in FIG. 2), a back stopper 236, a pair of folding rollers 238, and a folding knife. 240 and The sheet bundle conveyed from the binding unit 202 comes into contact with the folding stopper 232 and stops.

A pair of side guides positions the sheet bundle in the width direction X. As shown in FIG. Specifically, the pair of side guides are adjustable in width direction X spacing, and are adjusted in advance to a spacing corresponding to the width of the sheet (e.g., equal to the sheet width). The sheet bundle is conveyed between the pair of side guides and is positioned in the width direction X by the pair of side guides before contacting the folding stopper 232 . The back stopper 236 contacts the trailing edge of the sheet bundle to press the sheet bundle against the folding stopper 232 and position the sheet bundle in the transport direction Y. As shown in FIG.

The pair of folding rollers 238 are arranged side by side in the transport direction Y so that the axial direction faces the width direction X. As shown in FIG. When the folding knife 240 is raised between the pair of folding rollers 238 while being positioned in the transport direction Y by the folding stopper 232 and the back stopper 236 , the sheet bundle is caught between the pair of folding rollers 238 . A pair of folding rollers 238 folds the rolled sheet bundle in two to form a booklet, and sends the booklet to the discharge section 206 .

The discharge section 206 includes an upstream transport mechanism 242 and a downstream transport mechanism 244 . That is, the discharge section 206 has two transport mechanisms. The downstream transport mechanism 244 is provided downstream of the upstream transport mechanism 242 . The upstream transport mechanism 242 transports the booklet-shaped sheet bundle fed from the folding unit 204 to the downstream transport mechanism 244 . The downstream transport mechanism 244 transports the booklet fed from the upstream transport mechanism 242 to a spine forming position where the spine forming device 300 forms the spine. In the spine forming position, the leading edge (or spine) of the booklet is positioned in the spine forming device 300 and the trailing edge of the booklet is positioned in the saddle stitch folding device 200 . That is, the trailing edge side of the booklet stopped at the square spine forming position for square spine forming is supported by the belt of the downstream conveying mechanism 244 . When the spine forming is completed, the downstream conveying mechanism 244 conveys the booklet at the corner spine forming position further downstream.

The upstream-side conveying mechanism 242 is driven by a main motor (not shown) of the saddle stitching device 200, and drives the belt to rotate all the time. The downstream transport mechanism 244 is driven by a drive source different from that of the upstream transport mechanism 242, that is, a drive source different from the main motor of the saddle stitching device 200, or is driven by an electromagnetic clutch from the main motor of the saddle stitching device 200. etc., to drive the belt around. Therefore, as described above, the upstream transport mechanism 242 always rotates the belt, while the downstream transport mechanism 244 stops the belt while the booklet is stopped for forming the square spine.

A corner spine forming apparatus 300 includes a corner spine stopper 302 , a pair of clampers 304 , corner spine rollers 306 and a bottom guide 308 . The sheets are conveyed from the saddle-stitch folding device 200 in a state in which the spine faces the leading end and the longitudinal direction of the spine matches the width direction X. - 特許庁The spine of the booklet comes into contact with the square spine stopper 302 and stops. A pair of clampers 304 grip the stopped booklet near its spine.

The square back roller 306 is configured to be rotatable around the vertical axis and movable in the width direction X. As shown in FIG. When the square spine roller 306 is moved in the width direction X in a state where the square spine stopper 302 is retracted to a retracted position where it does not interfere with the movement of the square spine roller 306 and the pair of clampers 304 grip the booklet, the square spine roller 306 The spine of the booklet is pressed to finish the booklet into a square spine. After the booklet is finished with the square spine, the gripping by the pair of clampers 304 is released, and the booklet with the square spine is conveyed to the cutting device 400 .

The lower surface guide 308 is a plate-like member and is rotatable around a rotation shaft 310 extending in the axial direction. The rotating shaft 310 also serves as the roller shaft of the lower conveying roller 320 of the pair of conveying rollers 320 arranged on the downstream side of the corner spine stopper 302 and the corner spine roller 306 . The lower surface guide 308 takes a posture (a posture indicated by a solid line) in which the corner spine roller 306 moves so as not to come into contact with the corner spine roller 306 when the corner spine is formed. In addition, when conveying the booklet, the lower surface guide 308 takes a posture (the posture indicated by the dashed line) in which it enters the space in order to support the lower surface of the booklet with the main surface 308a. As a result, it is possible to prevent the booklet from being caught and jammed in the space for the square spine roller 306 to move.

Instead of the lower surface guide 308, guide plates having guide surfaces parallel to the lower surface of the conveyed booklet may be provided on both sides of the corner roller 306 in the width direction X. FIG. The guide plate has a fixed position relative to the corner roller 306 and is therefore movable in the width direction X together with the corner roller 306 . Further, the guide plate has a dimension in the width direction X shorter than that of the booklet, and does not protrude outside the apparatus regardless of the position of the square spine roller 306 . The guide plate supports part of the lower surface of the booklet in the width direction X when the booklet is transported.

FIG. 3 is a block diagram showing a functional configuration centering on the controller 600 of the bookbinding system 10. As shown in FIG. Each block of the control device 600 can be realized by hardware such as a computer CPU (Central Processing Unit) and other elements and mechanical devices, and is realized by software such as a computer program. , and the functional blocks realized by their cooperation are drawn. Therefore, those skilled in the art who have read this specification will understand that these functional blocks can be implemented in various ways by combining hardware and software.

The control device 600 includes a main control unit 602, a sheet supply control unit 604, a binding control unit 606, a folding control unit 608, a discharge control unit 610, a corner spine control unit 612, and a cutting control unit 614. Prepare.

The main control unit 602 controls the bookbinding system 10 in an integrated manner. The main control unit 602 receives an input of, for example, the job definition of the bookbinding process. The main control unit 602 may display a predetermined job management screen on a predetermined display and receive an input regarding the job definition via the job management screen. The job definition includes, for example, the number of booklets to be bound and the size of sheets included in the booklet (the spine size of the booklet). A sheet supply control unit 604, a binding control unit 606, a folding control unit 608, a discharge control unit 610, a corner spine control unit 612, and a trimming control unit 614 respectively operate the sheet feeding device 100 and the saddle stitch folding device based on the job definition. 200, the binding section 202, the folding section 204, the corner spine forming device 300, and the cutting device 400.

The corner spine forming device 300 includes a corner spine stopper driving mechanism 312 that moves the corner spine stopper 302 in the width direction X or in the vertical direction, and a corner spine roller 306 that moves in the width direction X or stops. Further provided are a stopper driving mechanism 316, a clamper driving mechanism 314 for causing the pair of clampers 304 to grip the booklet or releasing the gripping by the clampers, and a lower surface guide driving mechanism 318 for switching the posture of the lower surface guide 308. Each drive mechanism includes, for example, a motor, and is controlled by a corner control section 612 .

The above is the basic configuration of the bookbinding system 10 .

As a modification, the bookbinding system 10 may include a printer for printing characters and images on sheets instead of the sheet feeding device 100, and may feed sheets one by one from the printer.

Next, the corner spine forming by the corner spine forming device 300 will be described in detail. 4(a)-(b), FIGS. 5(a)-(b), FIGS. 6(a)-(b), and FIGS. 7(a)-(b) are corner spine forming by the spine forming device 300 It is a figure which shows an example of a scene. 4(a)-b), FIGS. 5(a)-(b), FIGS. 6(a)-(b), and FIGS. 7(a)-(b), the upper figures are plan views. , the bottom view is a side view seen in the width direction X. FIG. In this example, the spine shaping device 300 includes a pair of spine stoppers 302 .

In FIG. 4A, the square back roller 306 is positioned at the right end of the movable range R in the width direction X (hereinafter referred to as "movable range R").

In FIG. 4B, the corner spine stopper 302 has moved to the stop position. The "stop position" is a position where the transported booklet can be stopped, and is a position corresponding to the spine length of the booklet. The "position corresponding to the length of the spine of the booklet" in the corner spine stopper 302 may be a position where it can contact near both ends of the spine of the booklet in the width direction X. FIG. “Near both ends of the spine of the booklet” may be, for example, a position where at least a portion of the square spine stopper 302 abuts on both ends of the spine of the booklet when the spine is divided into four equal parts in the width direction X. The "booklet spine length" may be specified based on the sheet size input as the job definition, or may be specified based on the sheet size obtained by a sensor provided at an appropriate position. Alternatively, it may be the spine length of the booklet obtained by a sensor provided at an appropriate position.

In this example, since the booklet S1 is conveyed, the square spine stopper 302 is moved to a stop position corresponding to the spine length of the booklet S1. If a booklet S2 having a longer spine than the booklet S1 is conveyed, the square spine stopper 302 is set to a stop position (the position of the square spine stopper 302 indicated by the dotted line) according to the spine length of the booklet S2. move to In other words, the corner spine stopper 302 is a stop position corresponding to the spine length of the conveyed booklet. (located on the far side).

Also, in FIG. 4B, the corner roller 306 has moved to the starting position. The "start position" is the position of the corner spine roller 306 when corner spine forming is started. It is the position of the corner spine roller 306 when both of the following are satisfied: that it is retracted to a retracted position that does not interfere with the movement of the spine roller 306 .

The corner back control unit 612 may determine which position in the width direction X is the start position. The start position in this example is a position corresponding to the spine length of the conveyed booklet and a position that does not interfere with the corner spine stopper 302 at the stop position. The "position corresponding to the spine length of the booklet" at the start position is a position where the square spine roller 306 does not contact the booklet when the booklet is conveyed, and avoids the position at the extreme end of the movable range R. (that is, a position closer to the booklet than when positioned at the end of the movable range R).

Preferably, the “position according to the spine length of the booklet” is the position where the square spine roller 306 is close to the booklet in the width direction X. The "near position" is, for example, as shown in FIG. Alternatively, the distance L between the square spine roller 306 and the booklet in the width direction X may be 10 mm or less. In this example, since the booklet S1 is conveyed, the square spine roller 306 has moved to the start position close to the booklet S1. If a booklet S2 having a longer spine than S1 is conveyed, the square spine roller 306 moves to the start position (the position of the square spine roller 306 indicated by the dotted line) close to the booklet S2. In other words, the square spine roller 306 is preferably positioned at a starting position corresponding to the spine length of the conveyed booklet, and the longer the spine length of the booklet, the further out in the width direction X ( (located on the far side from the center).

In FIG. 5A, the conveyed booklet S1 is in contact with the corner spine stopper 302 and stopped. The position of the booklet S1 at this time is the square spine forming position, which is the position for forming the square spine.

In FIG. 5B, the pair of clampers 304 grip the vicinity of the spine of the booklet S1, and the square spine stopper 302 is retracted to the retracted position. In this example, the retracted position is a position raised from the stop position. Preferably, the booklet S1 is gripped by the pair of clampers 304, and then the square spine stopper 302 is retracted to the retracted position. The retraction of the spine stopper 302 and the gripping of the booklet S1 by the clamper 304 may be performed substantially simultaneously.

With the booklet S1 gripped by the clamper 304, the square spine roller 306 is moved from the start position to the end position, which will be described later. FIG. 6(a) shows the movement in progress. When the square spine roller 306 moves in the width direction X along the booklet S1, the square spine roller 306 presses the spine of the booklet S1.

In FIG. 6B, the square back roller 306 has moved to the end position and stopped. The entire spine of the booklet S1 is finished into a square spine. The "end position" is the position of the corner spine roller 306 when square spine forming is started. is the position of The "end position" in this example is a position corresponding to the length of the spine of the booklet S1 and a position that does not interfere with the corner spine stopper 302 when the corner spine stopper 302 moves from the retracted position to the stop position. . The "position according to the length of the spine of the booklet" for the end position is, like the start position, a position where the corner spine roller 306 does not contact the booklet, and the corner spine roller 306 and the booklet in the width direction X are close to each other.

In FIG. 7A, the gripping by the pair of clampers 304 is released, and the booklet S1, which is finished with a square spine, is conveyed toward the cutting device 400. In FIG.

In FIG. 7B, the booklet has moved to the stop position in preparation for the next booklet. In this example, the spine length of the next booklet is the same as the spine length of the previous booklet, and the ending position of the spine forming of the previous booklet is the starting position of the spine forming of the next booklet. . In this case, even if the corner spine roller 306 is not moved, the starting position will correspond to the length of the spine of the booklet.

In the above description, as a preferred example, the square spine roller 306 is moved to the start position before the booklet is conveyed to the square spine forming device 300, but this is not a limitation. The square spine roller 306 may be moved to the start position after the booklet arrives at the square spine forming position, provided that the position before the movement to the start position is a position that does not come into contact with the conveyed booklet. For example, when the pair of clampers 304 grip the booklet and then the square spine stopper 302 is retracted to the retracted position, or when the retraction of the square spine stopper 302 and the gripping of the booklet by the clamper 304 are executed substantially simultaneously, the square spine The corner roller 306 may be moved so that the movement of the corner roller 306 to the starting position is completed before the stopper 302 is retracted to the retracted position. Further, for example, when the pair of clampers 304 are caused to grip the booklet after retracting the corner spine stopper 302 to the retracted position, the movement of the corner spine roller 306 to the starting position is completed before the pair of clampers 304 grip the booklet. It suffices to move the square back roller 306 .

In the above description, as a preferred example, both the start position and the end position are positions according to the spine length of the booklet. at least one of the positions corresponding to the spine length of the booklet. For example, one of the start position and the end position may be the end position of the range R in the width direction X in which the corner roller 306 can move.

The effects of the above-described corner spine forming apparatus 300 will be described.

According to this embodiment, at least one of the start position and the end position is a position corresponding to the spine length of the booklet. Specifically, for example, compared to the case where one end of the range R in the width direction X in which the square spine roller 306 can move is the start position and the other end is the end position, the booklet is squared. The distance traveled by the corner spine roller 306 during spine shaping is shortened, the time required for corner spine shaping can be shortened, and productivity is improved.

Further, according to this embodiment, preferably, the spine roller 306 is moved to the starting position before the booklet is conveyed to the spine forming device 300 . As a result, it is possible to reliably prevent the square spine roller 306 from coming into contact with the conveyed booklet.

If the square spine stopper 302 abuts near the center of the spine of the booklet, the booklet is inclined and stopped, and the square spine cannot be formed normally. In contrast, according to the present embodiment, the square spine stopper 302 is moved to a position corresponding to the length of the spine of the booklet. As a result, the square spine stoppers 302 can be brought into contact with the vicinity of both ends of the spine of the booklet, thereby avoiding the situation where the booklet is inclined and stopped.

Further, according to the present embodiment, preferably, the end position is a position corresponding to the spine length of the booklet, and the end position is the start position for forming the square spine of the next booklet. As a result, the start position is set according to the length of the spine of the booklet without moving the square spine roller 306 . In other words, since it is not necessary to move to the starting position according to the spine length of the booklet, productivity is improved.

The present invention has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is merely an example, and that various modifications can be made to the combination of each component and each treatment process, and that such modifications are within the scope of the present invention. be. Such modifications will be described below.

In the embodiment, the case where the corner spine forming device 300 includes two corner spine stoppers 302 and the two corner spine rollers 306 are moved to positions according to the spine length of the booklet has been described, but this is not the only option. not. For example, the spine forming device 300 may include a plurality of spine stoppers 302 , and the plurality of spine stoppers 302 may be provided at equal intervals in the width direction X so as not to be movable in the width direction X.

FIG. 8 is a top view showing a corner spine stopper 302 of a corner spine forming device 300 according to a modification. In this example, the spine shaping device 300 includes four spine stoppers 302 . The four corner spine stoppers 302 are movable in the vertical direction but are immovable in the width direction X (that is, fixedly). A booklet S1 having a relatively short spine in the width direction X, such as the booklet S1 indicated by a solid line, is stopped by two corner spine stoppers 302 on the central side in the width direction X. FIG. A booklet S2 with a relatively long spine in the width direction X, like the booklet S2 indicated by the dashed line, is stopped by four corner spine stoppers 302 including two corner spine stoppers 302 at both ends in the width direction X. .

In the case of a booklet having a relatively short spine in the width direction X, such as the booklet S1 indicated by the solid line, the position of the square spine roller 306 indicated by the solid line may be the starting position. That is, the start position may be a position between two corner spine stoppers 302 adjacent to each other in the width direction X.

According to this modification, since the plurality of corner spine stoppers 302 cannot move in the width direction X, the configuration of the corner spine stopper drive mechanism 312 can be simplified.

Any combination of the embodiments and modifications described above is also useful as an embodiment of the present invention. A new embodiment resulting from the combination has the effects of each of the combined embodiment and modification. In addition, those skilled in the art will understand that the function to be achieved by each component described in the claims is realized by each component shown in the embodiments and modifications alone or by their linkage. .

10 bookbinding system, 300 square spine forming device, 302 square spine stopper, 304 clamper, 306 square spine roller, 600 control device.

Claims (5)

a roller movable in a predetermined direction;
a clamper for gripping the booklet such that the longitudinal direction of the spine coincides with the moving direction of the roller and the spine is pressed when the roller moves in the predetermined direction;
a control unit that moves the roller from a start position to an end position while the clamper grips the booklet;
At least one of the start position and the end position is a square spine forming device corresponding to the spine length of the booklet. Equipped with a stopper that stops the booklet at a predetermined position by contacting the spine of the booklet that is carried in,
2. The square spine forming apparatus according to claim 1, wherein the start position is a position corresponding to the spine length of the booklet and a position that does not interfere with the stopper. A driving mechanism for moving the stopper in the predetermined direction,
3. The square spine forming apparatus according to claim 2, wherein the controller controls the drive mechanism to move the stopper to a position corresponding to the spine length of the booklet. 4. The apparatus for forming a square spine according to claim 2, wherein said start position includes a position between said plurality of stoppers arranged in said predetermined direction. 5. The spine forming apparatus according to any one of claims 1 to 4, wherein the end position is the start position for forming the next booklet.

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