JP4175642B2 - Paper folding device - Google Patents

Paper folding device Download PDF

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JP4175642B2
JP4175642B2 JP2004041354A JP2004041354A JP4175642B2 JP 4175642 B2 JP4175642 B2 JP 4175642B2 JP 2004041354 A JP2004041354 A JP 2004041354A JP 2004041354 A JP2004041354 A JP 2004041354A JP 4175642 B2 JP4175642 B2 JP 4175642B2
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sheet
paper folding
pair
folding rollers
paper
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JP2005231778A (en
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千沙 加藤
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リコーエレメックス株式会社
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Description

  The present invention relates to a paper folding device, and more particularly to a paper folding device for Z-folding processing.

  Conventionally, Z-folding is performed as sheet processing after image formation, in which a sheet as a paper sheet image-formed by an image forming apparatus such as a copying machine or a printing machine is folded in two into a Z shape by a paper folding apparatus. Has been. At that time, the Z-folded and folded part (Z-folding part) is accumulated in the stacker part in a form in which the thickness and weight are increased as compared with the other parts. The bundle) may prevent the subsequent sheet from being discharged, or may be bent and deformed. Furthermore, there is a possibility that the Z folding processing unit of the sheet group (sheet bundle) in which subsequent sheets are stacked is pushed and disturbed, or the skew of the sheet is caused. Therefore, by providing a reversing path and sheet reversing means after the Z folding process by the paper folding device, the Z folding processing part of the sheet group (sheet bundle) is positioned at the base end side (the conveyance exit side of the machine body) of the stacker part. It has been proposed to eliminate these problems (see Patent Document 1).

JP 63-117872 A

  By the way, it is necessary to perform the Z-folding process on the sheet in the second half in the longitudinal direction of the image formed on the sheet. Therefore, as shown in FIG. 1A, if the front and rear portions in the formation direction of the image I formed on the sheet S coincide with the front and rear portions in the subsequent conveyance direction of the sheet S, the sheet S When the second half of the conveyance direction is Z-folded, the Z-fold processing unit Z is performed on the second half in the longitudinal direction of the image I as it is. However, as shown in FIG. 1B, when the front and rear portions in the image I forming direction do not coincide with the front and rear portions in the transport direction of the sheet S, the second half in the transport direction of the sheet S is changed to the Z-fold processing portion Z. Can not be. At that time, in order to perform the Z-fold processing on the first half of the sheet S in the transport direction, it is necessary to form an image by inverting the image reading data in the image forming apparatus. More specifically, the read image data must be temporarily expanded on the memory, and the data on the memory must be converted back (inverted) back and forth before image formation is performed. A large-capacity memory area is required.

  The technique (sheet processing apparatus and paper folding apparatus) described in Patent Document 1 is the type shown in FIG. 1B, and has a large-capacity memory area for inverting image read data on the image forming apparatus side. This is an obstacle to downsizing the image forming apparatus and the like and increasing the processing speed.

  The problem of the present invention is that the Z-folding process can be carried out without any trouble without reversing the image reading data on the image forming apparatus side such as a copying machine or a printing machine, and the image forming apparatus or the like can be downsized and the processing speed can be increased. It is possible to provide a compact paper folding device that can be realized and includes a pair of paper folding rollers.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the paper folding apparatus of the present invention is
A pair of paper folding rollers that rotate in contact with each other to fold a sheet as a paper sheet and that can be switched between a first direction and a second direction in which the rotation direction is reversed in the forward and reverse directions;
Supply direction of a sheet supplied to each of the pair of paper folding rollers from each loop forming space, arranged facing the triangular loop forming spaces formed on both sides across the contact position of the pair of paper folding rollers, or Guiding means for guiding the discharge direction of the sheet discharged from the pair of paper folding rollers to each loop forming space;
Positioning means for determining a relative position between the supply sheet and the respective guide means when the sheet is supplied to the pair of paper folding rollers by the respective guide means for performing the Z-folding process,
With the rotation of the pair of paper folding rollers in the first direction, the sheet positioned by the first positioning means and supplied to the first loop forming space by the first guiding means is the first folding position. After being folded by the pair of paper folding rollers, it is guided and discharged from the second loop forming space to the second guide means,
Thereafter, the sheet is held at a predetermined position by the second positioning means, and the rotation of the pair of paper folding rollers is stopped,
Along with the rotation of the pair of paper folding rollers in the second direction opposite to the first direction, the sheet supplied to the second loop forming space by the second guide means After being folded by the pair of paper folding rollers at a position, it is guided and discharged from the first loop forming space to the first guiding means,
Thereafter, the sheet is held at a predetermined position by the first positioning means, and the rotation of the pair of paper folding rollers is stopped.

In addition, in order to solve the above problems, the paper folding device of the present invention includes:
A pair of paper folding rollers that rotate in contact with each other to fold a sheet as a paper sheet and that can be switched between a first direction and a second direction in which the rotation direction is reversed in the forward and reverse directions;
Supply direction of a sheet supplied to each of the pair of paper folding rollers from each loop forming space, arranged facing the triangular loop forming spaces formed on both sides across the contact position of the pair of paper folding rollers, or Guiding means for guiding the discharge direction of the sheet discharged from the pair of paper folding rollers to each loop forming space;
Positioning means for determining a relative position between the image formed on the supply sheet and each guiding means when the sheet is supplied to the pair of paper folding rollers by the respective guiding means for performing the Z-folding process; With
As the pair of paper folding rollers rotate in the first direction, the sheet positioned by the first positioning means and supplied to the first loop forming space by the first guiding means is formed on the supply sheet. After being folded by the pair of paper folding rollers at the first folding position corresponding to a quarter of the longitudinal direction from the rear end of the formed image in the second direction, the second guiding means is provided from the second loop forming space. To be discharged
Thereafter, the sheet is held at a predetermined position by the second positioning means, and the rotation of the pair of paper folding rollers is stopped,
As the pair of paper folding rollers rotate in the second direction opposite to the first direction, the sheet supplied to the second loop forming space by the second guide means is formed on the supply sheet. After being folded by the pair of paper folding rollers at a second folding position corresponding to one half of the longitudinal direction from the rear end portion in the image forming direction, the first loop forming space is used to Guided by the guide means and discharged,
Thereafter, the sheet is held at a predetermined position by the first positioning means, and the rotation of the pair of paper folding rollers is stopped.

  If the front and rear parts of the image forming direction formed on the sheet by the image forming apparatus coincide with the front and rear parts of the sheet conveying direction to the stacker unit or the like, the latter half of the sheet conveying direction by these paper folding devices When the Z-folding process is performed, the Z-folding processing unit is implemented as it is in the latter half of the longitudinal direction of the image (see FIG. 1A). Therefore, the Z-folding process can be performed without any trouble without reversing the image reading data on the image forming apparatus side, and the image forming apparatus and the like can be downsized and the processing speed can be increased. In addition, the paper folding device of the present invention is constituted by a pair of paper folding rollers that can be switched between forward and reverse, so that a small and simple structure can be realized. Moreover, the trouble from the beginning accompanying the Z fold process part becoming the form which increased thickness and weight is also eliminated. That is, the stacked sheet group (sheet bundle) prevents the subsequent sheet from being ejected or is bent and deformed, and the sheet group (sheet bundle) in which the subsequent sheet is stacked is Z-folded. It is also possible to prevent the sheet from being disturbed and causing the sheet to skew.

  Further, when the paper folding process determines the relative positional relationship with the image formed on the sheet by the positioning means, the Z folding process at a predetermined position can be easily performed.

  In these paper folding apparatuses, the second half in the longitudinal direction of the image formed on the sheet by the image forming apparatus is supplied to the first loop forming space, and the Z-fold processing section is the image formed on the sheet. It is carried out in the second half in the longitudinal direction.

  On the sheet supply side, the supply sheet looped in the loop forming space is pressed from the back side to the pair of paper folding rollers at the folding position, while on the sheet discharge side, the discharge direction of the discharge sheet is changed. In order to guide to the positioning means side, the guide means can be configured as a deflector member capable of changing the direction. By providing the deflector member with a direction changing function and a sheet pressing function, the paper folding device can be simply configured.

  Further, in order to determine the relative position between the supply sheet and the guide means, the positioning means can be configured as a stopper member that receives and holds the end portion of the supply sheet. By receiving and holding the edge of the sheet with the stopper member, the relative position between the sheet (for example, an image formed on the sheet) and the guide means can be determined stably.

  Furthermore, a first regulation zone for regulating the position of the sheet folded at the first folding position is formed between the first guide means and the first positioning means, and the second guide means A second regulating zone for regulating the position of the sheet folded at the second folding position can be formed between the second positioning means. By forming both regulation zones, the supply sheet can be positioned and held more stably.

  At that time, the auxiliary roller for accommodating the sheet in the first restriction zone and carrying out the sheet accommodated in the first restriction zone by rotating in contact with one of the pair of paper folding rollers. Can be placed in the first restriction zone. Auxiliary roller placement prevents paper jams from occurring when a sheet before paper folding processing is introduced into the paper folding device and when a sheet after paper folding processing (after Z folding processing) is unloaded from the paper folding device. it can.

(Example)
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 2 is a schematic explanatory view showing an example of a sheet processing apparatus provided with a paper folding apparatus according to the present invention, and FIG. 3 is a structural explanatory view of its main part. As shown in FIG. 2, the sheet processing apparatus 100 includes an image forming apparatus 1 such as a copying machine or a printing machine that discharges an image-formed sheet S, and a paper folding apparatus 2 that performs Z-folding processing on the discharged sheet S. A paper folding mechanism 60 including the paper folding mechanism 60 and a finisher device 3 having a discharge tray 8 (stacker unit) for stacking the sheets S after the paper folding process are provided.

  In the conceptual diagram of FIG. 1, in the sheet processing apparatus 100 provided with the paper folding apparatus of the present invention, the front and rear portions in the forming direction of the image I formed on the sheet S by the image forming apparatus 1 are as shown in FIG. The front and rear portions in the conveyance direction of the sheet S to the discharge tray 8 are matched. Then, when the sheet S before the paper folding process is introduced from the rear end side in the transport direction into the paper folding apparatus 2 by the sheet introducing means described later, and the second half of the sheet S in the transport direction is Z-folded by the paper folding apparatus 2, The folding processing unit Z is performed in the second half in the longitudinal direction of the image I.

  As shown in FIG. 3, a passing conveyance path 10 (sheet conveyance path) and a paper folding conveyance path 11 (sheet introduction path) are disposed in the upper part (sheet processing apparatus 100) of the paper folding mechanism unit 60. . The passing conveyance path 10 is configured such that the sheet S discharged from the sheet carry-out port 6 (see FIG. 2) after image formation by the image forming apparatus 1 and carried into the sheet carry-in port 7 is transferred to the sheet discharge port 4 of the paper folding mechanism unit 60. In addition, in order to accumulate on the discharge tray 8 (see FIG. 2) via the sheet carry-in port 5, the carry-in roller 51, and the carry-out roller 52 of the finisher device 3, the discharge tray 8 side is conveyed in the conveyance direction and the image forming apparatus 1 side is conveyed. The sheet S is conveyed in the rear direction. The paper folding conveyance path 11 is branched into the passage conveyance path 10 and introduced into the paper folding apparatus 2 that performs the Z-folding process on the sheet S.

  Sheet introducing means 12 and 21 are disposed at a branch portion T between the passing conveyance path 10 and the paper folding conveyance path 11. The sheet introducing means 12, 21 has a function of introducing the sheet S before the paper folding process, which is conveyed in the passing conveyance path 10, from the rear end side in the conveyance direction to the paper folding conveyance path 11, and the second half in the conveyance direction by the paper folding device 2. The sheet S that has been subjected to the Z-folding process is returned to the passing conveyance path 10 again from the front end side in the conveyance direction via the paper folding conveyance path 11.

  Specifically, the sheet introducing means is composed of an inlet deflector 12 (path switching member; sheet introducing means) and a pair of return rollers 21 (reversible transport mechanism; sheet introducing means). The inlet deflector 12 switches the passage conveyance path 10 and the paper folding conveyance path 11 to a communication state or a non-communication state, and when in the communication state, the sheet S before the paper folding process is conveyed on the passage conveyance path 10 in the conveyance direction rear end. It has a function of being introduced into the paper folding conveyance path 11 from the side. The return roller 21 has a function of gripping the sheet S before the paper folding process conveyed through the passage conveyance path 10, conveying the passage conveyance path 10 in the reverse direction over a predetermined section, and introducing it into the paper folding conveyance path 11.

  The passing conveyance path 10 is provided with a pair of carry-in rollers 9 facing the sheet carry-in port 7 and a pair of discharge rollers 20 facing the sheet discharge port 4. Among these, the carry-in roller 9 can rotate only in the direction in which the sheet S is conveyed to the discharge tray 8, but the discharge roller 20 can rotate in reverse in conjunction with the return roller 21. However, the discharge roller 20 may be either reversely rotated by following the return roller 21 (revolving) or reversely rotated by its own drive. A pair 64 is provided in the middle of the paper folding conveyance path 11 for supplying the sheet S before the paper folding process to the paper folding apparatus 2 and returning the sheet S after the Z folding process to the passing conveyance path 10. This is a paper folding conveyance roller.

  Therefore, the sheet S before the paper folding process supplied from the branching section T to the inlet side of the paper folding apparatus 2 through the paper folding conveyance path 11 by the paper folding conveyance roller 64 is rotated forward and backward by the paper folding apparatus 2 described later. Along with this, a Z-folding process is performed on the latter half in the transport direction. The sheet S after the paper folding process is discharged again to the inlet side of the paper folding device 2 and is passed and conveyed from the front end side in the conveying direction via the paper folding conveying path 11, the paper folding conveying roller 64, the inlet deflector 12, and the return roller 21. Return to Road 10.

  In FIG. 3, the paper folding device 2 includes a pair of paper folding rollers 61 and 62 for folding the sheet S, deflectors 19 and 18 (guide means) for guiding the conveyance direction of the sheet S, and an end of the sheet S. Stoppers 16 and 22 (positioning means) for receiving and holding the portion. The pair of paper folding rollers 61 and 62 (first and second paper folding rollers) rotate in contact with each other, and the rotation directions of the rollers 61 and 62 are reversed and reversed (first direction and second direction). Can do.

  The deflectors 19 and 18 are arranged facing the triangular loop forming spaces formed on both sides of the contact position of the paper folding rollers 61 and 62, respectively. Specifically, the first deflector 19 located on the paper folding conveyance path 11 side guides the supply direction of the sheet S supplied to the paper folding rollers 61 and 62 from the loop forming space on the paper folding conveyance path 11 side. . The first deflector 19 guides the discharge direction of the sheet S discharged from the paper folding rollers 61 and 62 to the loop forming space on the side opposite to the paper folding conveyance path 11. On the other hand, the second deflector 18 located on the side opposite to the paper folding conveyance path 11 is supplied in the direction in which the sheet S is supplied to the paper folding rollers 61 and 62 from the loop forming space on the side opposite to the paper folding conveyance path 11. To guide. The second deflector 18 guides the discharge direction of the sheet S discharged from the paper folding rollers 61 and 62 to the loop forming space on the paper folding conveyance path 11 side.

  In this way, on the sheet S supply side, the deflectors 19 and 18 press the supply sheet S loop-formed in the loop formation space from the back side to the paper folding rollers 61 and 62 side. On the other hand, on the discharge side of the sheet S, the deflectors 19 and 18 are converted into directions in which the discharge direction of the discharge sheet S is guided to the stoppers 16 and 22 side.

  When the sheets S are supplied to the paper folding rollers 61 and 62 by the deflectors 19 and 18 in order to perform the Z-folding process, the stoppers 16 and 22 and the images I (see FIG. 1) formed on the supply sheet S and the respective sheets. A relative position with respect to the deflectors 19 and 18 is determined. For this purpose, the stoppers 16 and 22 are respectively provided with sensors (not shown) for detecting the end of the sheet S. On the paper folding conveyance path 11 side, the position of the sheet S that is folded at the first folding position (1/4 fold) between the first deflector 19 and the first stopper 16 is regulated. One regulation transport path 14 (first regulation zone) is formed. On the other hand, on the side opposite to the paper folding conveyance path 11, the position regulation of the sheet S that is folded at the second folding position (1/2 fold) between the second deflector 18 and the second stopper 22. A second restricting conveyance path 17 (second restricting zone) is formed. The quarter fold (1/2 fold) is the entire length from the end in the longitudinal direction of the image I (see FIG. 1) formed on the sheet S by the image forming apparatus 1 (= the end in the transport direction = the end in the image forming direction). Is formed at a position of 1/4 (1/2).

  An auxiliary roller 63 is disposed in the first regulating conveyance path 14. The auxiliary roller 63 contacts and rotates with one of the paper folding rollers 61 and 62 (for example, the second paper folding roller 62), thereby accommodating the sheet S in the first regulating conveyance path 14, The sheet S accommodated in the first restriction transport path 14 is unloaded.

  The sheet processing apparatus 100 is provided with a control unit (not shown) that sends out signals for controlling operations of the return roller 21, the entrance deflector 12, the paper folding apparatus 2, and the like. In addition, a sensor (not shown) for detecting the presence or absence of the sheet S to be conveyed may be provided in the passing conveyance path 10 at one or a plurality of locations.

  Next, the operation of the sheet processing apparatus 100 described above will be described with reference to FIGS.

(1) Introduction of sheet S before paper folding process (FIGS. 4A to 5B)
The sheet S discharged from the sheet carry-out port 6 (see FIG. 2) of the image forming apparatus 1 is taken in by the carry-in roller 9 from the sheet carry-in port 7 of the paper folding mechanism 60, and the discharge tray 8 (FIG. 2) of the finisher device 3. It is transported toward the reference side. At this time, since the inlet deflector 12 is in a state of closing the paper folding conveyance path 11 (not in communication with the passage conveyance path 10), the sheet S is conveyed along the passage conveyance path 10 in the direction of the sheet discharge port 4 (FIG. 4 (a)). At this time, if the presence sensor (not shown) detects that the sheet S has been conveyed until it reaches the discharge roller 20 beyond the return roller 21, the entrance deflector 12 of the branch portion T blocks the passage conveyance path 10. Then, the passage conveyance path 10 and the paper folding conveyance path 11 are switched to the communication state (FIG. 4B). At this time, the rotation of the carry-in roller 9 is stopped so that the subsequent sheet S is not conveyed to the passing conveyance path 10. Next, the return roller 21 and the discharge roller 20 rotate in opposite directions, and the sheet S in the passing conveyance path 10 is guided by the inlet deflector 12 of the branching section T and is fed from the rear end side in the conveyance direction to the paper folding conveyance path 11. (FIG. 4C).

  Further, the sheet S is sent toward the paper folding device 2 by the rotation of the paper folding conveyance roller 64 in the paper folding conveyance path 11 (FIG. 5A). Further, the sheet S is accommodated in the first regulating conveyance path 14 by the contact rotation between the second paper folding roller 62 and the auxiliary roller 63 (FIG. 5B). When the end of the sheet S reaches the first stopper 16, the rollers 62 and 63 stop rotating.

(2) Z-folding process [FIGS. 6A to 7C]
(2-1) Formation of quarter fold [FIGS. 6A to 6C]
The sheet S is pressed from both ends by the contact rotation between the second paper folding roller 62 and the auxiliary roller 63 and the rotation of the paper folding conveying roller 64. As a result, a loop is formed in the second half in the longitudinal direction (= second half in the conveyance direction = second half in the image forming direction) of the image I (see FIG. 1) formed on the sheet S by the image forming apparatus 1. One loop forming space is supplied. At this time, the first deflector 19 protrudes into the first loop forming space and presses from the back side of the sheet S (loop) toward the paper folding rollers 61 and 62 that rotate in contact with the first direction. On the supply sheet S, a quarter fold is formed at the first folding position, the position of which is regulated by the first deflector 19 and the first stopper 16 (FIG. 6A). The sheet S on which the quarter fold is formed is guided by the second deflector 18 and is conveyed from the second loop forming space to the second restriction conveying path 17. When the end of the sheet S reaches the second stopper 22, the paper folding rollers 61 and 62 stop rotating (FIG. 6B). The second deflector 18 is separated from the second loop forming space, and the second stopper 22 moves up along the second restricting conveyance path 17 to move the sheet S to the second folding position. Stop (FIG. 6 (c)).

(2-2) Formation of 1/2 fold [FIGS. 7A to 7C]
The paper folding rollers 61 and 62 rotate in contact with each other in the second direction, and the second deflector 18 protrudes into the second loop forming space and presses the sheet S from the back side to the paper folding rollers 61 and 62 side. In the sheet S, a ½ fold is formed at the second folding position where the position is regulated by the second deflector 18 and the second stopper 22 (FIG. 7A). The sheet S on which the 1/2 fold is formed is guided by the first deflector 19 and is conveyed from the first loop forming space to the first regulating conveyance path 14. When the end of the sheet S reaches the first stopper 16 that has moved down (FIG. 7B), the paper folding rollers 61 and 62 stop rotating, and the first deflector 19 moves from the first loop forming space. They are separated (FIG. 7C).

(3) Derivation of sheet S after paper folding process [FIGS. 8A and 8B]
The sheet S after the Z-folding process is fed to the paper folding conveyance path by the upward movement (returning operation) of the first stopper 16, the contact rotation between the second paper folding roller 62 and the auxiliary roller 63, and the rotation of the paper folding conveyance roller 64. 11 is raised (FIG. 8A). At this time, the second stopper 22 moves downward (return operation). Further, the sheet S is guided by the entrance deflector 12 of the branch portion T and returned to the passing conveyance path 10 from the front end side in the conveyance direction by the rotation of the return roller 21 (and the discharge roller 20) (FIG. 8B).

(4) Half-fold process [FIGS. 9A to 9C]
In the case of the half-folding process, the first stopper 16 is positioned below the case of the 1/4 fold formation shown in FIG. 6A, and the position is regulated by the first deflector 19 and the first stopper 16. The bent position is a ½ fold, but the other operation is the same as in FIG. 6A (FIG. 9A). When the second stopper 22 receives the sheet S on which the 1/2 fold has been formed, the paper folding rollers 61 and 62 stop rotating in the first direction, and the second stopper 22 is immediately raised and the paper is moved. The folding rollers 61 and 62 are reversed (contact rotation) in the second direction (FIG. 9B). When the first stopper 16 moved downward receives the sheet S, the paper folding rollers 61 and 62 stop rotating in the second direction, and the first deflector 19 is separated from the first loop formation space ( FIG. 9 (c)).

(Modification)
FIG. 10 shows a modification of the paper folding apparatus. In the paper folding apparatus 2 ′ shown in FIG. 10, instead of the first stopper 16 that receives the rear end side in the conveyance direction of the supply sheet S, a holder 16 ′ (first positioning means) that holds the front end side in the conveyance direction of the supply sheet S. ) Is provided. Even if this holder 16 'is used as the first positioning means, the Z-folding process can be performed in the latter half of the sheet S in the transport direction.

  FIG. 11 shows a modification of the sheet processing apparatus. In the sheet processing apparatus 200 of FIG. 11, the finisher apparatus 3 including the passing conveyance path 10 (sheet conveyance path) and the discharge tray 8 (stacker unit) is directly coupled to the sheet carry-out port 6 of the image forming apparatus 1. Yes. A paper folding conveyance path 11 (sheet introduction path) and a paper folding apparatus 2 are arranged in the passing conveyance path 10 of the finisher device 3. Accordingly, the sheet processing apparatus 200 is configured to be more compact.

  In the modification shown in FIGS. 10 and 11, parts having the same functions as those in the embodiment (FIGS. 1 to 9) are denoted by the same reference numerals and description thereof is omitted.

Explanatory drawing showing the concept of this invention. 1 is a schematic explanatory view showing an example of a sheet processing apparatus provided with a paper folding apparatus according to the present invention. FIG. 3 is a configuration explanatory diagram of a main part of FIG. 2. Explanatory drawing which shows the action | operation of a sheet | seat introduction means. Explanatory drawing which shows the action | operation of the paper folding apparatus for Z folding process. Explanatory drawing which shows the action | operation of the paper folding apparatus following FIG. Explanatory drawing which shows the action | operation of the paper folding apparatus following FIG. Explanatory drawing which shows the action | operation of the paper folding apparatus following FIG. Explanatory drawing which shows the action | operation of the paper folding apparatus for a half-fold process. Explanatory drawing which shows the modification of a paper folding apparatus. Explanatory drawing which shows the modification of a sheet processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Paper folding apparatus 3 Finisher apparatus 6 Sheet exit port 8 Ejection tray (stacker part)
10 Passing conveyance path (sheet conveyance path)
11 Paper folding conveyance path (sheet introduction path)
12 Inlet deflector (path switching member; sheet introducing means)
14 First regulation transport path (first regulation zone)
16 First stopper (first positioning means)
17 Second regulation transport path (second regulation zone)
18 Second deflector (second guide means)
19 First deflector (first guide means)
21 Return roller (reversible transport mechanism; sheet introducing means)
22 Second stopper (second positioning means)
61 First paper folding roller 62 Second paper folding roller 63 Auxiliary roller 100 Sheet processing apparatus I Image S Sheet T Branching section

Claims (7)

  1. A pair of paper folding rollers that rotate in contact with each other to fold a sheet as a paper sheet and that can be switched between a first direction and a second direction in which the rotation direction is reversed in the forward and reverse directions;
    Supply direction of a sheet supplied to each of the pair of paper folding rollers from each loop forming space, arranged facing the triangular loop forming spaces formed on both sides across the contact position of the pair of paper folding rollers, or Guiding means for guiding the discharge direction of the sheet discharged from the pair of paper folding rollers to each loop forming space;
    Positioning means for determining a relative position between the supply sheet and the respective guide means when the sheet is supplied to the pair of paper folding rollers by the respective guide means for performing the Z-folding process,
    With the rotation of the pair of paper folding rollers in the first direction, the sheet positioned by the first positioning means and supplied to the first loop forming space by the first guiding means is the first folding position. After being folded by the pair of paper folding rollers, it is guided and discharged from the second loop forming space to the second guide means,
    Thereafter, the sheet is held at a predetermined position by the second positioning means, and the rotation of the pair of paper folding rollers is stopped,
    Along with the rotation of the pair of paper folding rollers in the second direction opposite to the first direction, the sheet supplied to the second loop forming space by the second guide means After being folded by the pair of paper folding rollers at a position, it is guided and discharged from the first loop forming space to the first guiding means,
    Thereafter, the sheet is held at a predetermined position by the first positioning means, and the rotation of the pair of paper folding rollers is stopped.
  2. A pair of paper folding rollers that rotate in contact with each other to fold a sheet as a paper sheet and that can be switched between a first direction and a second direction in which the rotation direction is reversed in the forward and reverse directions;
    Supply direction of a sheet supplied to each of the pair of paper folding rollers from each loop forming space, arranged facing the triangular loop forming spaces formed on both sides across the contact position of the pair of paper folding rollers, or Guiding means for guiding the discharge direction of the sheet discharged from the pair of paper folding rollers to each loop forming space;
    Positioning means for determining a relative position between the image formed on the supply sheet and each guiding means when the sheet is supplied to the pair of paper folding rollers by the respective guiding means for performing the Z-folding process; With
    As the pair of paper folding rollers rotate in the first direction, the sheet positioned by the first positioning means and supplied to the first loop forming space by the first guiding means is formed on the supply sheet. After being folded by the pair of paper folding rollers at the first folding position corresponding to a quarter of the longitudinal direction from the rear end of the formed image in the second direction, the second guiding means is provided from the second loop forming space. To be discharged
    Thereafter, the sheet is held at a predetermined position by the second positioning means, and the rotation of the pair of paper folding rollers is stopped,
    As the pair of paper folding rollers rotate in the second direction opposite to the first direction, the sheet supplied to the second loop forming space by the second guide means is formed on the supply sheet. After being folded by the pair of paper folding rollers at a second folding position corresponding to one half of the longitudinal direction from the rear end portion in the image forming direction, the first loop forming space is used to Guided by the guide means and discharged,
    Thereafter, the sheet is held at a predetermined position by the first positioning means, and the rotation of the pair of paper folding rollers is stopped.
  3.   The paper folding apparatus according to claim 1 or 2, wherein a second half in the longitudinal direction of an image formed on a sheet by the image forming apparatus is supplied to the first loop forming space.
  4.   On the sheet supply side, the guide means presses the supply sheet loop-formed in the loop formation space from the back side to the pair of paper folding rollers at the folding position, while on the sheet discharge side, The paper folding device according to any one of claims 1 to 3, wherein the paper folding device is configured as a deflector member capable of changing a direction in order to guide a discharge direction of the discharge sheet toward the positioning means.
  5.   5. The positioning unit according to claim 1, wherein the positioning unit is configured as a stopper member that receives and holds an end portion of the supply sheet in order to determine a relative position between the supply sheet and the guide unit. Paper folding device.
  6. Between the first guide means and the first positioning means is formed a first restriction zone for regulating the position of the sheet folded at the first folding position,
    2. The second restriction zone for restricting the position of the sheet folded at the second folding position is formed between the second guide means and the second positioning means. 6. The paper folding apparatus according to any one of 5 above.
  7. In the first restriction zone, the sheet is accommodated in the first restriction zone and is accommodated in the first restriction zone by rotating in contact with one of the pair of paper folding rollers. The paper folding apparatus according to claim 6, wherein an auxiliary roller for carrying out the sheet is disposed.
JP2004041354A 2004-02-18 2004-02-18 Paper folding device Active JP4175642B2 (en)

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Cited By (2)

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JP2011093684A (en) * 2009-10-30 2011-05-12 Nisca Corp Sheet folding device and image forming system having the same
CN106553934A (en) * 2015-09-24 2017-04-05 富士施乐株式会社 Plate materials processing device and image formation system

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JP5248785B2 (en) * 2007-01-31 2013-07-31 ニスカ株式会社 Post-processing apparatus and image forming system having the same
US20090062099A1 (en) 2007-08-29 2009-03-05 Kabushiki Kaisha Toshiba Folding roller for sheet processing apparatus
JP5394863B2 (en) 2009-09-09 2014-01-22 ニスカ株式会社 Sheet folding apparatus and image forming system provided with the same
US8590880B2 (en) 2009-10-30 2013-11-26 Nisca Corporation Sheet folding apparatus and image formation system provided with the apparatus
US8585032B2 (en) 2009-10-30 2013-11-19 Nisca Corporation Sheet folding apparatus and image formation system provided with the apparatus
US8256757B2 (en) 2009-10-30 2012-09-04 Nisca Corporation Sheet folding apparatus with skew correction mechanism and image formation system provided with the sheet folding apparatus
JP5621545B2 (en) * 2010-11-25 2014-11-12 株式会社リコー Paper folding device
US8897691B2 (en) 2011-04-27 2014-11-25 Nisca Corporation Sheet folding apparatus and image formation system provided with the apparatus
JP2017171505A (en) * 2017-06-05 2017-09-28 株式会社リコー Sheet folding device, image formation apparatus, image formation system and sheet folding method

Cited By (3)

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Publication number Priority date Publication date Assignee Title
JP2011093684A (en) * 2009-10-30 2011-05-12 Nisca Corp Sheet folding device and image forming system having the same
CN106553934A (en) * 2015-09-24 2017-04-05 富士施乐株式会社 Plate materials processing device and image formation system
US10023424B2 (en) 2015-09-24 2018-07-17 Fuji Xerox Co., Ltd. Sheet processing apparatus and image forming system

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