JP6732281B2 - Paper folding device - Google Patents

Description

The present invention relates to a paper folding device having a plurality of buckles.

This type of paper folding device is disclosed in Patent Documents 1 and 2, and the like, and is provided in the bookbinding system. The paper folding device includes a transport unit that sequentially transports the paper, and a paper folding unit that folds the paper transported from the transport unit. The paper folding section is provided with a plurality of buckles, and the sheets sequentially transported from the transport section are folded at right angles in the transport direction a number of times corresponding to the number of buckles to form a signature. The signatures formed by the sheet folding device are overlapped by a certain number of sheets by the post-processing device at the subsequent stage to form a main body (book block).

For example, a sheet folding device having two buckles can fold a sheet having a length of 300 mm twice to form a three-fold signature (a signature of page 6). By stacking a certain number of these signatures, the main body having a page number that is a multiple of 6 is formed. Therefore, according to this example, a maximum of 5 blank pages may occur depending on the number of pages of the booklet to be created.

As a method for suppressing blank pages, for example, a 200 mm-long sheet is folded once to form a double-folded signature (a 4-page signature), and a 4-page signature and the aforementioned 6-page signature are folded. It is conceivable to form a main body having a page number of a multiple of 2 that is not a multiple of 4 and not a multiple of 6 by combining and overlapping the Ding. However, since the sheet folding device cannot change the folding type of the sheet for each sheet that is sequentially conveyed, the above method cannot be performed.

The paper folding device of Patent Document 1 closes the entrance of the buckle with a guide member (turning element), so that the paper sent from the pair of introduction rollers is not introduced into the buckle and is not folded. It is possible to send it to the folding roller. In the paper folding apparatus of Patent Document 1, the folding mold can be changed in advance by the use of the guide member before the start of the bookbinding process, but the folding mold cannot be changed for each sheet that is sequentially conveyed. ..

JP, 2013-230938, A International Publication 2013/161048

The present invention provides a sheet folding device capable of changing a folding mold in accordance with the length of a sequentially transported sheet in the transport direction.

Sheet folding apparatus according to the present invention includes a conveying section for sequentially conveying the sheet, and a sheet folding section sequentially folding the paper which has been conveyed from the conveying unit, is conveyed to the paper folding unit paper by the conveying unit And a paper length determination unit for determining the length of the paper in the transport direction when the paper is in the transport direction, and the paper is disposed downstream of the paper length determination unit, and the paper is transported to the paper folding unit by the transport unit. A timing sensor that detects the paper when the paper is present and a control unit that controls the paper folding unit are provided, and a plurality of types of paper having different lengths in the transport direction are sequentially transported by the transport unit.
The paper folding unit includes a plurality of buckle having an inlet for the introduction of the paper, is provided for each of the buckle, a pair of introduction rollers for introducing the paper through the inlet into the buckle, provided for each of the buckle, a pair of sheet folding rollers for folding the protruding portions from the buckle of the paper use introduced into the buckle, provided for at least one of said buckle And a guide member. Furthermore, the paper folding unit, the guide member is introduced and an open position for allowing the the paper is introduced into the buckle from the pair of introduction rollers, the paper from the pair of introduction rollers into the buckle And a guide movement mechanism that moves the sheet from the pair of introduction rollers to the pair of sheet folding rollers so as not to be folded and to a closed position.
Wherein, for each of the paper are sequentially conveyed to the paper folding unit by the conveying unit, to determine the length of the conveying direction of the sheet by the sheet length determination section, the paper said When detected by the timing sensor, the position of the guide member is determined to be either the open position or the closed position based on the determined length of the sheet in the transport direction, and the guide moving mechanism guides the guide. The member is positioned at the determined position, and the sheet is folded by the sheet folding unit while the guide member is at the determined position .

The sheet length determination means comprises a sensor for detecting the paper for that have been conveyed to the paper folding unit by the transport unit, the control unit, in the transport direction of the paper length, the detection sensor May be determined based on the time during which the sheet is continuously detected.

In embodiments where the transport direction of the two different lengths from each other in the paper is transported by the transport section, the paper length determination means, a paper for that have been conveyed to the paper folding unit by the conveying unit a first detection sensor that detects, located remotely to the conveying direction from the first detection sensor, and a second sensor for detecting the paper for that have been conveyed to the paper folding unit by the transport unit, distance between the detection area of the second detection sensor and the detection area of the first detection sensor is, the smaller than the length in the conveying direction of the longer sheet of the two types of the paper, said shorter paper It may be set larger than the length in the transport direction. Then, the control unit, while the the paper passes through the detection region and the detection region of the second detection sensor of said first sensor, said first sensor and said second sensor simultaneously detects the paper when, the paper is determined to be a longer sheet, while the paper passes through the detection region and the detection region of the second detection sensor of said first sensor, said first sensor and said When the second detection sensor does not detect the paper at the same time, the paper is determined to be the shorter paper.

The sheet length determination means is a reading apparatus for reading a one-dimensional code or two-dimensional code attached to the paper, the control unit, the length in the transport direction of the paper is read by the reading device The determination may be made based on the information contained in the one-dimensional code or the two-dimensional code of the sheet.

The guide member may be one extending in the direction perpendicular to the introduction direction into the buckle the paper. The guide moving mechanism is disposed on both sides of the bracket and the guide member in the right-angled direction, is provided on the bracket so as to be swingable around an axis extending in the right-angled direction, and the side surface of the guide member in the right-angled direction. And a first guide plate that supports the guide member, and the guide member is disposed on both sides of the guide member in the right-angled direction. The bracket is swingably provided around an axis extending in the right-angled direction and supports the side surface of the guide member. A second guide plate, the first guide plate and the second guide plate are arranged so as to intersect with each other, and the first guide plate is biased in one direction of its swinging direction. A first torsion spring, a second torsion spring that biases the second guide plate in one direction of the swinging direction, a main line, and a branch from the main line, each of which engages with a plurality of pulleys. And a cord having one branch line connected to one of the first guide plates and the other branch line connected to the other first guide plate. A pulling mechanism for pulling from the main line side may be provided. Then, the guide moving mechanism pulls the cord by the tensioning mechanism, and the first guide plate and the second guide plate are respectively moved in the other direction of the swing direction to the first torsion spring and the first torsion spring. By swinging against the two torsion springs, the guide member is moved from the open position to the closed position. Further, the guide moving mechanism releases the tension of the cord-shaped body by the tension mechanism, and the first guide plate and the second guide plate are respectively moved in the one direction of the swing direction of the first torsion plate. By swinging the spring and the second torsion spring, the guide member is moved from the closed position to the open position.

The portion of the cord that engages with the pulley is a stranded wire formed by twisting a plurality of wires, and at least one of the linearly extending portions of the cord is more flexible than the stranded wire. It may be configured by a single wire having low flexibility.

The sheet folding apparatus according to the present invention, having the above configuration, can change the folding mold according to the length of the sequentially conveyed sheets in the conveying direction.

1 is a side view schematically showing a sheet folding device according to an embodiment of the present invention. It is a top view which shows schematically the buckle of FIG. 1, the guide member of a closed position, and a guide moving mechanism. FIG. 3A is a side view showing the guide member in the open position and the guide moving mechanism, and FIG. 3B is a side view schematically showing the guide member in the open position and the buckle. FIG. 4A is a side view showing the guide member and the guide moving mechanism at the intermediate position, and FIG. 4B is a side view schematically showing the guide member and the buckle at the intermediate position. 5A is a side view showing the guide member and the guide moving mechanism in the closed position, and FIG. 5B is a side view schematically showing the guide member and the buckle in the closed position.

An embodiment of a sheet folding device according to the present invention will be described below with reference to the accompanying drawings. The paper folding device is included in the bookbinding system.

As shown in FIG. 1, the sheet folding apparatus includes a transport unit 1 that sequentially transports the sheets S. A pre-processing device (not shown) such as an image forming device that forms an image on the paper S is arranged in the front stage of the paper folding device, and the transport unit 1 is sequentially supplied from the pre-processing device. The paper S is transported in the transport direction Y. The transport unit 1 is attached to a frame (not shown) having a transport path G, and includes a transport conveyor 2 that transports the paper S on the transport path G while supporting the lower surface thereof.

The paper folding device further includes a paper folding unit 3 arranged at the rear stage of the transport unit 1. The paper folding unit 3 folds the paper S transported from the transport unit 1 in a direction perpendicular to the transport direction Y.

The paper folding unit 3 includes a plurality of buckles 4a and 4b (two in the embodiment) attached to the frame so that the paper S is sequentially introduced. The buckles 4a and 4b have entrances 5a and 5b for introducing the paper S, respectively.

The paper folding unit 3 includes stoppers (not shown) provided for the buckles 4a and 4b, respectively. The stoppers are arranged on the buckles 4a and 4b so that the leading ends of the sheets S introduced into the buckles 4a and 4b through the inlets 5a and 5b come into contact with the stoppers and the sheets S are positioned at predetermined positions. Note that the stopper is arranged so as to be slidable along the introduction direction K of the sheet S and slid by the stopper moving mechanism, as in Patent Document 2.

The paper folding section 3 is provided for each of the buckles 4a and 4b, and is arranged to face each other near the entrances 5a and 5b of the buckles 4a and 4b. It is provided with a pair of introducing rollers 6a, 6b; 6b, 6c for introducing. Further, the paper folding section 3 is provided for each of the buckles 4a and 4b, and is arranged to face each other near the entrances 5a and 5b of the buckles 4a and 4b. It is provided with a pair of paper folding rollers 6b, 6c; 6c, 6d for folding the portions protruding from the buckles 4a, 4b. Each roller 6a-6d is attached to the frame so as to be rotationally driven by a driving source (not shown).

As is apparent from FIG. 1, three rollers are assigned to one buckle, and one of the rollers functions as one of a pair of introducing rollers and also functions as one of a pair of paper folding rollers. .. Further, the pair of folding rollers for the previous buckle function as the pair of introducing rollers for the next buckle.

The paper folding unit 3 includes a guide member 7 provided for at least one buckle 4a (first buckle in the embodiment) and a guide moving mechanism 8 for moving the guide member 7. As in the plan view of FIG. 2, the guide member 7 extends in a direction perpendicular to the introduction direction K (hereinafter, simply referred to as a right angle direction) like the inlet 5a of the buckle 4a. Further, as shown in FIG. 3, the guide member 7 has a guide surface 9 curved in a concave arc shape.

As shown in FIGS. 2 and 3A, the guide moving mechanism 8 includes a first guide plate 10 arranged on both sides of the guide member 7 in the right-angle direction and a second guide plate 11 arranged on both sides of the guide member 7 in the right-angle direction. It has and. As shown in FIG. 3A, the first guide plate 10 and the second guide plate 11 are arranged so as to intersect with each other.

The first guide plate 10 is attached to the bracket 12 so as to be capable of swinging about an axis extending in a right-angled direction with a first swing pin 13 inserted in a central portion thereof as a swing center. The second guide plate 11 is attached to the bracket 12 so as to be capable of swinging about an axis extending in a perpendicular direction with the second swing pin 14 inserted at one end thereof as the swing center.

The first guide plate 10 has a side surface in a direction perpendicular to the guide member 7 via the connection pin 16 inserted into the one end side and the connection plate 15 and the connection pin 17 inserted into the connection plate 15 and the guide member 7. I support you. The second guide plate 11 supports the side surface of the guide member 7 via the side opposite to the second swing pin 14, the connection plate 15, and the connection pin 18 inserted into the guide member 7.

The first torsion spring 19 (torsion coil spring) is provided for the first guide plate 10. The coil portion of the first torsion spring 19 is fitted onto the first swing pin 13, one arm of which is engaged with the engaging pin 20 of the bracket 12, and the other arm of which is the first guide plate 10. The engagement pin 21 is engaged. As a result, the first torsion spring 19 attaches the first guide plate 10 to one direction of the swinging direction with the first swinging pin 13 as the swinging center (counterclockwise in the embodiment, the same applies hereinafter). I am energetic.

The second torsion spring 22 is provided for the second guide plate 11. A coil portion of the second torsion spring 22 is externally fitted to the second swing pin 14, one arm of the second torsion spring 22 is engaged with the engagement pin 23 of the bracket 12, and the other arm thereof is a hole of the second guide plate 11. It is passed through 24 and engages with the peripheral surface of the hole 24. As a result, the second torsion spring 22 biases the second guide plate 11 in one direction of the swing direction with the second swing pin 14 as the swing center.

Further, a cord 25 is provided. The cord 25 includes a main line 26 (FIG. 2) and two branch lines 27 branching from one end of the main line 26. The main line 26 is on the center line of the buckle 4a extending in the introduction direction K. The two branch lines 27 are respectively engaged with three pulleys 28, 29 (FIG. 2, FIG. 3A), 30 (FIG. 3A) so as to be symmetrical with respect to the center line. The one branch line 27 is connected to the one first guide plate 10 on the opposite side to the connection pin 16, and the other branch line 27 is connected to the other first guide plate 10 on the opposite side to the connection pin 16. Connected by.

As shown in FIG. 2, a pulling mechanism 31 that pulls the cord 25 from the main line 26 side is provided. In the embodiment, the pulling mechanism 31 includes a reel 32 on which the main line 26 of the cord 25 is wound and unwound, and a motor 33 that rotates the reel 32 to wind the main line 26 on the reel 32. The main line 26 is wound around the reel 32 by driving the motor 33, and as a result, the cord 25 is pulled. The pulling mechanism 31 may be configured by a cylinder that pulls the cord 25 from the main line 26 side instead of the reel 32 and the motor 33.

The portion of the cord 25 that engages with the pulleys 28, 29, 30 and the portion that is wound around the reel 32 have a flexible twisted wire formed by twisting a plurality of metal wires (see FIG. 2). (Indicated by thin lines). Further, the portion of the cord 25 that extends in a straight line without engaging with the pulleys 28, 29, 30 is a metal single wire having a lower flexibility than the stranded wire (shown by a thick line in FIG. 2). ). The stranded wire and the single wire are connected by a connecting body 34. By doing so, the aged deterioration of the cord 25 is minimized.

As shown in FIG. 3, the guide member 7 is positioned at a position retracted upward from the inlet 5a of the buckle 4a by the first guide plate 10 and the second guide plate 11 that are biased as described above. Therefore, the sheet S is allowed to be introduced into the buckle 4a from the pair of introduction rollers 6a and 6b through the entrance 5a. Hereinafter, the position of the guide member 7 in FIG. 3 will be referred to as an open position.

In FIG. 3, when the cord 25 is pulled by the pulling mechanism 31, the first guide plate 10 and the second guide plate 11 move against the first torsion spring 19 and the second torsion spring 22, respectively. It swings in the other direction of movement (that is, clockwise). As shown in FIG. 5, the first guide plate 10 and the second guide plate 11 swing until the connecting pin 16 of the first guide plate 10 engages with the engagement recess 35 of the second guide plate 11. As a result, the guide member 7 moves from the open position of FIG. 3 to the front of the entrance 5a of the buckle 4a through the intermediate position of FIG. 4 and is positioned as shown in FIG. At this position, the guide surface 9 of the guide member 7 faces the paper S sent from the pair of introduction rollers 6a and 6b. Therefore, the guide member 7 prevents the sheet S from being introduced into the buckle 4a from the pair of introduction rollers 6a and 6b by the guide surface 9 thereof, and also allows the sheet S to be paired from the pair of introduction rollers 6a and 6b. The paper folding rollers 6b and 6c are guided so as not to be folded. Hereinafter, the position of the guide member 7 in FIG. 5 will be referred to as a closed position.

On the other hand, in FIG. 5, when the tension of the cord 25 by the tensioning mechanism 31 is released, the main line 26 of the cord 25 is paid out from the reel 32, and the cord 25 is loosened. Then, the first guide plate 10 and the second guide plate 11 swing in one direction of the swing direction by the first torsion spring 19 and the second torsion spring 22, respectively. As a result, the guide member 7 moves from the closed position to the open position.

As described above, the guide moving mechanism 8 quickly moves the guide member 7 between the open position (FIG. 3) and the closed position (FIG. 5). The guide moving mechanism 8 is not limited to the above.

Referring again to FIG. 1, in this paper folding device, plural types of paper S having different lengths in the transport direction Y (hereinafter, simply referred to as lengths) are supplied from the pretreatment device to the transport unit 1. It has become. In the embodiment, two types of sheets S having different lengths are supplied to the transport unit 1. Therefore, the sheet folding device controls the sheet folding unit 3 based on the sheet length discriminating unit 36 for discriminating the length of the sheet S conveyed by the conveying unit 1 to the sheet folding unit 3. And a control unit 37.

In FIG. 1, an example of the paper length discriminating means 36 is shown collectively.
As an example, the paper length determination unit 36 includes a detection sensor 38 that is attached to the frame and that detects the paper S that is being conveyed to the paper folding unit 3 by the conveyance unit 1. The detection sensor 38 is connected to the control unit 37.

The time during which the detection sensor 38 continues to detect the sheet S increases in proportion to the length of the sheet S. Therefore, the control unit 37 determines whether the length of the paper S corresponds to the length of the paper S previously input to the control unit 37, based on the time when the detection sensor 38 continues to detect the paper S. To do. That is, in the embodiment, the control unit 37 determines whether the sheet S is the longer sheet or the shorter sheet of the two types of sheets based on the time.

When two types of sheets S are conveyed as in the embodiment, the sheet length determination unit 36 is attached to the frame, connected to the control unit 37, and conveyed to the sheet folding unit 3 by the conveyance unit 1. A first detection sensor 38 and a second detection sensor 39 that detect the existing paper S may be provided. The second detection sensor 39 is arranged apart from the first detection sensor 38 in the transport direction Y. The interval between the detection area of the first detection sensor 38 and the detection area of the second detection sensor 39 is set to be smaller than the length of the longer sheet and larger than the length of the shorter sheet. Therefore, the longer sheet is not detected by both detection sensors 38 and 39 at the same time, and the shorter sheet is not detected by both detection sensors 38 and 39 at the same time.

Accordingly, when the detection sensors 38 and 39 simultaneously detect the sheet S while the sheet S passes through the detection areas of the detection sensors 38 and 39, the control unit 37 determines that the sheet S is the longer sheet S. It is determined that On the other hand, when the detection sensors 38 and 39 do not detect the paper S at the same time during the passage, the control unit 37 determines that the paper S is the shorter paper.

Further, the paper length determination means 36 is a one-dimensional code or a two-dimensional code (hereinafter, simply referred to as a code) attached to the paper S attached to the frame and being conveyed to the paper folding section 3 by the conveying section 1. A reading device 40 for reading may be provided. The reading device 40 is connected to the control unit 37. The code of the sheet S is formed on the sheet S by, for example, an image forming apparatus as a preprocessing device. The code of the paper S includes information on the length of the paper S. The control unit 37 determines the length of the paper S based on the information included in the code of the paper S read by the reading device 40.
The above is an example of the paper length determination unit 36, but the invention is not limited to the above example.

Further, the paper folding device is attached to the frame, is arranged downstream of the paper length determination means 36, is connected to the control unit 37, and conveys the paper S conveyed by the conveyance unit 1 to the paper folding unit 3. A detection sensor 41 for detecting is provided. The detection sensor 41 is a timing sensor for operating the guide moving mechanism 8.

The control unit 37 includes a processor, a storage medium, and the like. The guide moving mechanism 8 (the motor 33 thereof) is connected to the controller 37. The length of the sheet S to be conveyed is input in advance to the control unit 37, and further, for each length of the sheet S, a guide member for deciding whether to position the guide member 7 in the open position or the closed position. The position information of No. 7 is input in advance. In the embodiment, the positional information that the guide member 7 is located at the open position for the longer paper and the guide member 7 is located at the closed position for the shorter paper is input. Then, the control unit 37 folds the sheet S as follows.

The control unit 37 sequentially determines the lengths of the sheets S being conveyed to the sheet folding unit 3 by the sheet length determination unit 36, and stores the conveyance order of the sheets S having different lengths in a storage medium. ..

When the detection sensor 41 detects the sheet S, the control unit 37 recognizes the length of the sheet S with reference to the above-described conveyance order, and determines the position of the guide member 7 with respect to the sheet S by the position information. Then, the guide member 7 is positioned at the determined position by the guide moving mechanism 8. Then, the control unit 37 causes the paper folding unit 3 to fold the paper S to form a signature.

In the embodiment, when the sheet is longer, the control unit 37 determines the position of the guide member 7 as the open position, and causes the guide moving mechanism 8 to position the guide member 7 at the open position. Then, the sheet S is drawn between the pair of introducing rollers 6a and 6b and introduced into the buckle 4a through the inlet 5a, and the leading end of the sheet S abuts against the stopper of the buckle 4a, and the inlet 5a of the buckle 4a of the sheet S is reached. The part protruding from the part bends. Then, the bent portion is drawn between the pair of paper folding rollers 6b and 6c, and the paper S is folded to one side. Then, the folded sheet S is similarly folded to the opposite side by the buckle 4b, the pair of introducing rollers 6b and 6c, and the pair of sheet folding rollers 6c and 6d. That is, the paper S is folded twice and discharged from the paper folding section 3.

On the other hand, when the paper is short, the control unit 37 determines the position of the guide member 7 as the closed position, and causes the guide moving mechanism 8 to position the guide member 7 at the closed position. Then, the sheet S is drawn between the pair of introducing rollers 6a and 6b and guided between the pair of sheet folding rollers 6b and 6c without being guided to the buckle 4a and folded by the guide member 7 in the closed position. And is drawn in. Then, the sheet S is folded by the buckle 4b, the pair of introducing rollers 6b and 6c, and the pair of sheet folding rollers 6c and 6d. That is, the buckle 4a is not used, only the buckle 4b is used, the sheet S is folded once and discharged from the sheet folding unit 3.
The folding process of the sheet S as described above is performed on each of the sheets S that are sequentially conveyed.

As described above, the sheet folding device determines the length of the sheet S for each sheet S and determines whether to use the buckle 4a provided with the guide member 7 based on the determination result. .. As a result, the folding pattern can be instantly changed according to the length of the sheet S.

For example, in the sheet folding apparatus of the embodiment, the positions of the stoppers of the buckles 4a and 4b are adjusted in advance, and a 300 mm sheet (longer sheet) is folded twice by the buckles 4a and 4b and equally folded into three. If a folded signature (6-page signature) is formed, a 200 mm sheet (shorter sheet) is folded once by the buckle 4b and folded in half (4). Page signature). Moreover, this is realized without changing the position of the stopper of the buckle 4b when folding a 300 mm sheet and when folding a 200 mm sheet.

Thus, by combining and stacking a 6-page signature and a 4-page signature, it is possible to form a body of a multiple of 2 that is not a multiple of 4 but a multiple of 6, and a blank page is 1 page. Can be reduced to For example, in the case of producing a 25-page booklet, conventionally, 30 6-page signatures are formed by 5 6-page signatures or 5 blank pages are generated, or 7 4-page signatures are used. Whether to form the main body of the page and generate a blank page of 3 pages. On the other hand, according to the paper folding apparatus of the present invention, which can change the folding pattern instantly, three 6-page signatures and two 4-page signatures can be formed in succession, so that the 26-page main body can be formed. Can be formed, and the blank page can be suppressed to one page. Thus, by using the paper folding device of the present invention, it is possible to effectively suppress the occurrence of blank pages.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. Although the two buckles 4a and 4b are provided in the embodiment of FIG. 1, three or more buckles may be provided. Further, although the guide member 7 is provided for only one buckle 4a in the above embodiment, it is provided for two or more buckles and the guide moving mechanism 8 is provided for each of the guide members 7. May be provided.

DESCRIPTION OF SYMBOLS 1 conveyance part 3 paper folding parts 4a, 4b buckles 5a, 5b buckle inlets 6a, 6b; 6b, 6c pair of introducing rollers 6b, 6c; 6c, 6d pair of paper folding rollers 7 guide member 8 guide moving mechanism 10 first Guide plate 11 Second guide plate 19 First torsion spring 22 Second torsion spring 25 Cord 26 Main line 27 Branch line 31 Tension mechanism 36 Paper length discriminating means 37 Control unit Y Paper conveyance direction K Paper introduction into buckle direction

Claims (6)

A transport unit that sequentially transports paper,
A sheet folding section sequentially folding the paper which has been conveyed from the conveying unit,
A sheet length determining means for determining the length of the sheet in the transport direction when the sheet is being transported by the transport section to the paper folding section ;
A timing sensor which is arranged downstream of the sheet length determination means and detects the sheet when the sheet is being conveyed to the sheet folding section by the conveying section;
A control unit for controlling the paper folding unit,
A sheet folding device in which a plurality of types of sheets having different lengths in the transport direction are sequentially transported by the transport unit,
The paper folding section is
A plurality of buckle having an inlet for the introduction of the paper,
Provided for each of the buckle, a pair of introduction rollers for introducing through said inlet for the paper to the buckle,
Provided for each of the buckle, a pair of sheet folding rollers for folding the protruding portions from the buckle of the paper use introduced into the buckle,
A guide member provided for at least one of the buckles,
The paper while preventing the guide member, and an open position for allowing the the paper is introduced into the buckle from the pair of introduction rollers, that the paper is introduced into the buckle from the pair of introduction rollers A guide moving mechanism for moving the guide roller from the pair of introduction rollers to the pair of paper folding rollers so as not to be folded, and a guide position.
The control unit is
For each of the paper are sequentially conveyed to the paper folding unit by the transport unit, by the paper length discriminating means discriminates the length of the conveying direction of the sheet is detected the sheet by said timing sensor Then , based on the determined length of the sheet in the conveyance direction, the position of the guide member is determined to be either the open position or the closed position, and the position where the guide member is determined by the guide moving mechanism. And fold the sheet at the sheet folding section with the guide member in the determined position ,
A paper folding device characterized by the above. The paper length determination means,
Comprising a sensor for detecting the paper for that have been conveyed to the paper folding unit by the transport unit,
The control unit is
The length in the transport direction of the paper, determined based on the time the sensor continues to detect the paper,
The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is a sheet folding apparatus. Are those wherein the conveying direction of the two different lengths from each other in the paper is transported by the transport unit,
The paper length determination means,
A first sensor for detecting the paper for that have been conveyed to the paper folding unit by the transport unit,
The first is located from the detection sensor away the transport direction, and a second sensor for detecting the paper for that have been conveyed to the paper folding unit by the transport unit, the detection area of the first detection sensor distance between the detection area of the second detection sensor and is, the two kinds of the transport direction of the longer sheet of the paper less than the length, is set larger than the length in the conveying direction of the shorter sheet And
The control unit is
While the paper passes through the detection region and the detection region of the second detection sensor of said first sensor when said first sensor and the second sensor detects the sheet simultaneously, the paper is Determined to be the longer paper,
While the paper passes through the detection region and the detection region of the second detection sensor of said first sensor when said first sensor and said second sensor does not detect the paper simultaneously, the paper Determines that it is the shorter paper,
The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is a sheet folding apparatus. The paper length determination means,
A reading apparatus for reading a one-dimensional code or two-dimensional code attached to the paper,
The control unit is
The length in the transport direction of the paper, determined on the basis of the one-dimensional code or information contained in the two-dimensional code of the paper read by the reading device,
The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is a sheet folding apparatus. The guide member is
The direction of introduction into the buckle the paper extends perpendicularly,
The guide moving mechanism,
Bracket and
A first guide plate disposed on both sides of the guide member in the right-angled direction, provided on the bracket so as to be swingable around an axis extending in the right-angled direction, and supporting the side surface of the guide member in the right-angled direction;
A second guide plate disposed on both sides of the guide member in the right-angled direction, provided on the bracket so as to be swingable around an axis extending in the right-angled direction, and supporting the side surface of the guide member, The first guide plate and the second guide plate are arranged so as to intersect with each other, and
A first torsion spring that biases the first guide plate in one direction of its swinging direction;
A second torsion spring for urging the second guide plate in one direction of the swinging direction;
It consists of a main line and two branch lines branched from the main line and engaged with a plurality of pulleys. One of the branch lines is connected to one of the first guide plates, and the other branch line is the other. A cord connected to the first guide plate of
A pulling mechanism for pulling the cord from the main line side,
The cord is pulled by the tensioning mechanism to swing the first guide plate and the second guide plate in the other direction of the swinging motion against the first torsion spring and the second torsion spring, respectively. Moving the guide member from the open position to the closed position,
The tension of the cord-shaped body is released by the tension mechanism, and the first guide plate and the second guide plate are respectively moved in the one direction of the swing direction by the first torsion spring and the second torsion spring. By swinging, the guide member is moved from the closed position to the open position,
The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is a sheet folding apparatus. The portion of the cord that engages with the pulley is a stranded wire formed by twisting a plurality of wires, and at least one of the linearly extending portions of the cord is more flexible than the stranded wire. The sheet folding device according to claim 5, wherein the sheet folding device is configured by a single wire having low flexibility.

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