JP2012056686A - Paper folding device, image forming system and method of additionally folding paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure an additional folding effect and further to achieve improvement in productivity and reduction in power consumption.SOLUTION: The paper folding device includes: a folding plate and a folding roller pair for folding paper or paper bundle, which are arranged in a subsequent stage of a creasing means for creasing the paper; an additionally folding roller for further additionally folding the crease part of the folded paper or paper bundle; and a CPU for controlling the folding means and the additionally folding means, wherein the CPU changes the number of additional folding times by the additionally folding roller and/or pressuring force of the additionally folding roller based on paper information or bookbinding information (steps S205, S206 and S207).

Description

  The present invention relates to a paper folding apparatus, an image forming system, and a paper additional folding method, and more specifically, a paper folding apparatus having an additional folding function, an image forming apparatus, a paper conveyed from the image forming apparatus side, and a transfer paper A sheet-fitting device that folds a sheet member such as a film-like member (herein simply referred to as paper) in the center before folding the sheet member in two, The present invention relates to an image forming system including a sheet folding device that performs folding processing, and an additional folding method executed in the image forming system.

  Conventionally, so-called center-folding or center-folding is performed in which a sheet bundle in which a plurality of sheets discharged from an image forming apparatus are bundled is subjected to saddle stitching, and the center-bound sheet bundle is folded in two at the center. It has been broken. When a bundle of sheets made up of a plurality of sheets is folded together in this way, the amount of extension of the sheet at the folding portion on the outer side of the sheet bundle becomes larger than that of the inner sheet. For this reason, the formed image portion extends at the outer paper folding portion, and the image portion may be damaged, such as toner peeling. The same phenomenon occurs in other folding processes such as Z-folding and three-folding. Further, folding may be insufficient depending on the thickness of the sheet bundle.

  Therefore, before performing a folding process such as folding the sheet bundle in half, a crease called a crease that prevents the toner from peeling off by making a crease in advance in the folded part of the sheet and making the outer sheet easily fold. The device is already known.

  As one of such crease marking devices, for example, the invention described in Patent Document 1 (Japanese Patent Laid-Open No. 2008-81258) is known. The present invention provides an annular convex portion on the outer periphery of a roller for forming a folding die and an annular outer periphery of a pair of rollers for the purpose of forming a highly accurate folding die according to the type of paper. Are formed, and a folding mold is formed along the sheet conveying direction by passing the sheet between them. In this case, the roller can be replaced with an optimum roller according to the paper.

  By the way, in the conventional crease forming apparatus that performs additional folding including the invention described in Patent Document 1, when folding a folded sheet and further folding it, the sheet has a fold and is easy to fold. In spite of this, the folding is further repeated a predetermined number of times at a predetermined pressure. Therefore, in some cases, the number of additional folds increases unnecessarily, leading to a decrease in productivity. In addition, since the sheet is further folded by applying high pressure, power is consumed wastefully.

  Therefore, a problem to be solved by the present invention is to improve productivity and reduce power consumption while securing an additional folding effect.

  In order to solve the above-described problem, the first means includes a folding means for folding the paper or the paper bundle, and a folding portion for folding the paper or the paper bundle. Further, in the paper folding apparatus comprising an additional folding means for further folding, and a control means for controlling the folding means and the additional folding means, the control means performs the additional folding of the additional folding means based on paper information or bookbinding information. The operation is changed.

In this case, the change is the number of times of additional folding and / or the change is the pressure of additional folding, and the change of the additional folding operation is performed when there is a fold on the paper and the paper is a pre-specified paper type. Executed.
Further, the change of the additional folding operation is executed when the sheet has a predetermined thickness when the sheet has a crease and the sheet is not specified in advance.

  Further, the control means performs the above-mentioned change based on the sheet information or the bookbinding information of the sheet with no crease when the sheet bundle including the sheet with the crease and the sheet without the crease is additionally folded. Judging by all means.

  The second means includes a paper folding apparatus according to the first means, an image forming apparatus that forms an image on the paper, and a crease device that performs a crease process on the paper carried from the image forming apparatus. And an image forming system.

  In this case, the image forming apparatus includes a recognizing unit that recognizes the sheet information or bookbinding information, a determining unit that determines the condition to be changed, and an additional folding unit that is added to the control unit based on a determination result of the determining unit. And an instruction means for instructing an operation change.

  The third means includes a first step of recognizing paper information or bookbinding information in the paper additional folding method for further folding the folded portion of the folded paper or paper bundle, and the paper bundle based on the recognized information. A second step of determining whether or not all the sheets are creased, and a third step of determining whether or not the paper type is specified in advance when the second step is not a specific sheet A step, a fourth step for determining whether or not the paper thickness is defined in advance, and a case where a crease is applied in the second step, and a specific paper type is used in the third step; In the step (5), when the paper thickness is a specified thickness, the number of additional folds is decreased or the additional folding pressure is decreased to increase the number of folds, and a sheet that has not been creased in the second step. Yes, if the paper type is not specified in the fourth step, the number of additional folds or increase A sixth step of performing a folding without changing the pressure Ri, characterized in that it comprises.

  In the embodiments described later, the crease means is the crease apparatus A, the fold means is the fold plate 8 and the fold roller pair 9, the additional fold means is the fold roller 13, and the recognition means and control means are CPU_PR1. Alternatively, each corresponds to CPU_B1.

  According to the present invention, the additional folding operation of the additional folding means is changed based on the paper information or the bookbinding information so that unnecessary additional folding operation is not performed. Therefore, productivity is ensured while ensuring the additional folding effect. Can be improved and power consumption can be reduced.

1 is a diagram showing a schematic configuration of an image forming system in an embodiment of the present invention. It is explanatory drawing which shows a series of operation | movement of an image forming system with a folding process, and shows a state when a paper is carried in into a crease forming apparatus. FIG. 9 is an explanatory diagram showing a series of operations of the image forming system with folding processing, and shows a state when the leading edge of the sheet has been conveyed to just before the downstream conveying means. It is explanatory drawing which shows a series of operation | movement of an image forming system with a folding process, and shows a state when the crease forming process is performed. FIG. 6 is an explanatory diagram showing a series of operations of the image forming system with folding processing when a creased sheet is carried into a sheet post-processing apparatus and a second sheet is carried into a crease apparatus; Indicates the state. It is explanatory drawing which shows a series of operation | movement of an image forming system accompanied by a folding process, and shows a state when the front end of the second sheet is abutted against the abutting plate in front of the crease forming part. It is explanatory drawing which shows a series of operation | movement of an image forming system with a folding process, and shows the state when the crease | folding process is performed to the 3rd sheet | seat. It is explanatory drawing which shows a series of operation | movement of an image forming system with a folding process, and shows the state when the last sheet | seat is integrated | stacked on the middle folding process tray. FIG. 9 is an explanatory diagram showing a series of operations of the image forming system with folding processing, and shows a state when the sheet bundle is moved from the state of FIG. 8 to the center folding position. It is explanatory drawing which shows a series of operation | movement of an image forming system accompanied by a folding process, and shows the state when the middle folding process is performed from the state of FIG. It is explanatory drawing which shows a series of operation | movement of an image forming system accompanied by a folding process, and shows the state when the additional folding process is performed from the state of FIG. It is explanatory drawing which shows a series of operation | movement of an image forming system accompanied by a folding process, and shows the state discharged | emitted while performing a middle folding by a folding roller. FIG. 5 is an explanatory diagram showing a series of operations of the image forming system with folding processing, and shows a state when a folded sheet bundle is discharged onto a stacking tray. It is a figure which shows schematic structure of a crease marking mechanism, and shows the state in which the marking member was separated from the cradle. It is a figure which shows schematic structure of a crease marking mechanism, and shows the state which the scribe member press-contacts a receiving stand and has made a crease. It is the schematic which simplified the structure of FIG. 14 and was seen from the front side of the system. It is operation | movement explanatory drawing which shows fold marking operation | movement, and shows a state when a marking blade leaves | separates and the front-end | tip of a paper approachs a marking position. It is operation | movement explanatory drawing which shows a crease | folding operation | movement, and shows a state when a rotation member has closed the notch of a guide plate. FIG. 9 is an operation explanatory diagram showing a crease marking operation, and shows a state before a sheet has passed through a post-attachment position and the marking blade is opposed to the sheet before performing a marking process. It is operation | movement explanatory drawing which shows a crease | folding operation | movement, and shows the state when the scribe process is being performed with the scribe blade. It is a figure which shows the relationship between the additional folding roller which moves along a fold part, and performs an additional folding process, and a sheet bundle. FIG. 6 is a diagram illustrating a relationship between an additional folding roller that performs an additional folding process by reciprocating an additional folding roller portion that is positioned parallel to the fold, and a sheet bundle. FIG. 2 is a diagram illustrating a control configuration of the image forming system according to the present embodiment. It is a flowchart which shows the operation | movement procedure of mark processing. It is a flowchart which shows the operation | movement procedure of an additional folding change process.

Since the present invention facilitates folding when a crease is made with a specific paper type or a specified paper thickness in the additional folding process in the fold processing apparatus after the crease is made, The number of additional folds in the additional folding process is reduced, or the pressure of the roller or the like is reduced.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of an image forming system according to an embodiment of the present invention. This image forming system basically includes an image forming apparatus PR that forms an image on a sheet, a creasing apparatus A that performs scoring, and a folding processing apparatus B that performs folding processing (post-processing).

  The crease marking apparatus A includes first and second transport means 1 and 2 and a crease marking mechanism C. The crease marking mechanism C is composed of a mark marking member 6 and a cradle 7. A crease is made by sandwiching the paper with the base 7. After the crease is made by the crease device A, the sheet is sent to the fold processing device B downstream. The folding processing device B includes third to fifth transport means 3, 4, 5, a middle folding device D, and a stacking tray 12. In this embodiment, the conveying means is constituted by a conveying roller.

  The image forming apparatus PR visualizes and outputs image data input from a scanner, PC, etc. as a visible image on paper, and uses a known image forming engine such as an electrophotographic method or a droplet discharge method. The

  The crease device A includes a conveyance mechanism and a crease mechanism C. The crease mechanism C includes a crease member (corresponding to the rotating member C9: see FIG. 9) and a cradle C11 (see FIG. 9). A linear crease is created by sandwiching the paper between the crease-applying member and the cradle. Blades (crease blades-convex blades) for making marks are provided in a straight line in the direction perpendicular to the paper transport direction on the end face of the crease-bearing member facing the cradle. The crease blade is formed in a blade shape with a sharp tip. On the other hand, on the surface of the cradle facing the crease blade, a crease groove (concave blade) into which the tip edge of the crease blade fits is cut. Since both are formed in such a shape, when the sheet is sandwiched, a crease is formed by the tip shape (convex blade) and the groove shape (concave blade).

  The folding processing device B includes an intermediate folding device D that performs folding processing, and the sheet on which the crease is made by the crease forming apparatus A is carried in, and the sheet is transferred to the first to third transport means 3 and 3 of the transport mechanism. 4 and 5 lead to the folding device D.

  The middle folding device D includes a middle folding processing tray 10, a rear end fence 11 provided at the lower end (the most upstream side in the conveying direction) of the middle folding processing tray 10, a folding plate 8 and a folding roller pair 9 that are folded along the trace, An additional folding roller 13 and a stacking tray 12 provided in the rear stage of the roller pair 9 are provided. The trailing edge fence 11 aligns the sheet conveyance direction. The trailing edge of the sheet discharged to the middle folding processing tray 10 is forcibly pressed against the trailing edge fence 11 by a return roller (not shown), and the position of the sheet is adjusted. Align. Further, alignment in a direction orthogonal to the transport direction is also performed by a jogger fence (not shown).

  The folding plate 8 presses its leading edge against the aligned sheet bundle along the fold and pushes it into the nip of the pair of folding rollers 9. As a result, the sheet bundle is pushed into the nip of the pair of folding rollers 9, and a crease is made at the nip. In the case where the saddle stitching process is involved, the folding process, so-called bi-folding, is performed after the binding process is performed on a portion to be streaked by a binding device (not shown). The folded sheet bundle is discharged to the stacking tray 12 and stacked.

  2 to 12 are explanatory diagrams showing a series of operations of the image forming system accompanied with the folding process. In this image forming system, the sheet P1 on which an image is formed in the image forming apparatus PR is conveyed into the creasing apparatus A and stops at a position where a crease is made (FIGS. 2 and 3). As shown in FIG. 4, when the leading edge of the paper P <b> 1 stops at a position where it abuts on the nip of the second conveying means 2, the marking member 6 is lowered, and the paper P <b> 1 is sandwiched between the marking member 6 and the cradle 7. As a result, a crease is made on the paper P1 (FIG. 4).

  Thereafter, the sheet P1 with the crease is conveyed to the folding processing apparatus B (FIG. 5) and temporarily stored in the middle folding processing tray 10 (FIG. 6). The above operation is repeated for a predetermined number of sheets (FIG. 7), and when a predetermined number of sheet bundles P1 to Pn are stored (FIG. 8), the rear end fence 11 lifts the sheet bundle to the folding position (FIG. 9). ), The folding plate 8 is advanced to push the crease portion attached to the sheet, and the folding plate 8 is pushed into the nip of the pair of folding rollers 9 to perform the folding process (FIG. 10). Then, additional folding is performed a plurality of times while applying pressure again (FIG. 11). Thereafter, the paper is discharged onto the stacking tray 12 (FIGS. 12 and 13). The process of creating one sheet bundle is repeated for a predetermined number of booklets, and is sequentially stacked on the stacking tray 12.

  14 and 15 are diagrams showing a schematic configuration of the crease forming mechanism. In the figure, the marking means of the crease marking mechanism C is composed of a rotating member C9 and a marking blade C10, and the rotating member C9 and the marking blade C10 are integrally rotated by the rotation driving mechanism C5. The The rotational drive mechanism C5 includes a drive source. Further, sliding members C7 having a diameter larger than that of the rotating member C7 are coaxially attached to both ends of the rotating member C9. The cam C4 and the elastic member 8 are in contact with the upper and lower sides of the sliding member C7, respectively. The sliding member C7 is always in sliding contact with the cam 4 by the elastic member C8, and moves up and down according to the rotation of the cam C4.

  The cam C4 is rotationally driven by the driving force of the elevating drive means C1 being transmitted by the belt transmission mechanism means C2 and C3. By the rotation of the cam C4 which is an eccentric cam, the sliding member C7, the rotating member C9, and the marking blade C10 and the rotation drive mechanism C5 are integrated to reciprocate in the vertical direction with respect to the cradle 11. The cradle 11 is provided at a position facing the scoring blade C10, and in the process of vertical reciprocation, the paper is pinched between the scoring blade C10 and the cradle C11 and pressed to make a crease. FIG. 16 is a diagram illustrating the configuration of FIG. 14 as viewed from the front side of the system.

  FIG. 23 is a block diagram showing an electrical configuration of the image forming system in the present embodiment. The image forming system according to the present embodiment includes a crease forming apparatus A, a fold processing apparatus B that performs a fold process, and an image forming apparatus PR. The image forming system includes CPU_A1, B1, and PR1, and the CPU_PR1 and the fold of the image forming apparatus PR. The CPU_A1 of the marking apparatus A is connected to be communicable by the communication port PR2 on the image forming apparatus PR side and the first communication port A2 on the fold marking apparatus A side, and the CPU_A1 of the folding apparatus A and the folding processing apparatus B are connected. The CPU_B1 is communicably connected by a second communication port A3 on the folding device A side and a communication port B2 on the folding device B side. In addition, the image forming apparatus PR is equipped with an engine PRE for image formation, and an operation panel OP is connected to function as a man-machine interface of the user with the image forming system.

  Each device includes an I / O unit that controls input and output with a driver that drives each sensor, solenoid, motor, and the like, and operates according to instructions from the CPU. Each CPU_PR1, A1, B1 develops a program code stored in a ROM (not shown) in a RAM (not shown), and executes control according to the program defined by the program code while using the RAM as a work area and a data buffer. Then, each unit is operated through each driver. Further, the CPU_PR1 of the image forming apparatus PR controls the entire system, and the CPU_A1 and B1 of the crease forming apparatus A and the folding processing apparatus B control and control each apparatus in accordance with instructions of the CPU_PR1 of the image forming apparatus PR. Information necessary for the transmission is transmitted to the image forming apparatus PR side.

  17 to 20 are operation explanatory views showing the crease operation. As shown in FIG. 17, the sheet is generally conveyed by guiding the sheet with the guide members G <b> 1 and G <b> 2 and applying a conveying force with the first and second conveying means 1 and 2. Therefore, in order to make a crease with the sheet sandwiched between the marking blade C10 and the cradle C11, a space through which the marking blade C10 passes through the guide members G1 and G2 (hereinafter referred to as “notch portion GP”). Is required. However, since the end of the guide member G2 is exposed on the downstream side of the notch, the notch GP may cause the leading edge of the conveyed paper to be caught. Therefore, in the present embodiment, as shown in FIG. 18, the notch portion GP of the guide member is blocked by a part of the rotation member C9 until the leading end of the sheet passes, and after the leading end of the sheet passes, as shown in FIG. The rotating member C9 and the marking blade C10 are both retracted and rotated so that the marking blade C10 faces the paper. Then, as shown in FIG. 20, when the sheet comes to a predetermined position, a mark is made with the mark blade C10 and the cradle C11 sandwiching the sheet.

  FIG. 24 is a flowchart showing the operation procedure at this time. In the figure, when preparation for receiving paper is completed (step S101: YES), the rotating member C9 is raised to the hope position (position not to be marked) (step S102: FIG. 17). At this time, it is rotated by the rotation drive mechanism C5 so that the marking blade 10 does not face the paper. Then, the rotating member C9 is lowered to the notch GP of the guide plate G2, and the notch GP is closed with the rotating member C9 (step S103: FIG. 18). The ascending operation and the descending operation of the rotating member C9 are performed by the above-described elevating drive mechanism C1.

  Then, after waiting for the leading edge of the sheet to pass (step S104: YES), the rotating member is moved (lifted) to the standby or retracted position (step S105), and the marking blade C10 can be traced. Rotate to (marking processing position), that is, downward (step S106: FIG. 19), descend from that position, and perform marking processing on the paper (step S107: FIG. 20). When the marking is finished, it moves (rises) to a standby or retracted position, and waits for the reception of the next sheet (step S108: FIG. 17). In the present embodiment, as described above, the rotating member C9 moves up and down integrally with the marking blade C10, the rotation driving mechanism C5, and the sliding member C7.

  Although the marking process is performed as described above, in the present embodiment, the number of times of additional folding or the pressure is further changed in accordance with the state and presence of the marking. FIG. 25 is a flowchart showing the processing procedure of such additional folding change control.

  For example, when the paper bundle sent from the crease attaching device A to the folding processing device B is further folded, if the paper has a crease, the method of controlling the additional folding is changed according to the state of the paper bundle or the paper. To do. The control change is the number of times of additional folding or the pressure, and the number of times of additional folding is reduced or the pressure is reduced for a specific paper type and a prescribed paper thickness. However, if there is no crease in all the sheet bundles (only the cover is creased with saddle stitching), the method for controlling the additional folding is not changed.

  For example, as shown in FIG. 21, when the additional folding roller D1 moves perpendicularly to the sheet conveyance direction, the number of reciprocations is the number of reciprocations, as shown in FIG. When the additional folding roller D2 arranged side by side repeats forward and reverse rotations to perform additional folding, this means the number of repetitions, and when changing the pressure applied to the paper, for example, the additional folding pressure is changed. In this case, pressure control is performed by controlling the drive current of the motor that applies the applied pressure. Needless to say, with respect to pressure control, the objects to be controlled differ depending on the mechanism for applying the applied pressure. 21 and 22, reference signs P <b> 1 to Pn denote n sheet bundles, and reference sign Px denotes a fold portion of the sheet bundle.

  In the flowchart of FIG. 25, first, paper information or bookbinding information is recognized (step S201), and then it is determined whether or not there are creases on all the sheets in the paper bundle (step S202). If there is a crease, it is determined whether or not the paper is a specific paper type (paper thickness) (step S203). If the paper type is specified in advance to reduce the number of additional folds or reduce the pressure. (Step S203: YES), the number of additional foldings is reduced or the applied pressure is reduced (Step S205), and the additional folding process is executed (Step S207).

  On the other hand, if the paper type is not a specific paper type in step S203, it is determined whether the paper thickness is a specified paper thickness (step S204). (Step S204: YES), the number of additional foldings is reduced or the pressure is reduced (Step S205), and the additional folding process is executed (Step S207).

  On the other hand, if the sheet thickness is not the prescribed value in step S204, and if all the sheets of the sheet bundle are not creased in step S202, the number of additional folds or the additional folding pressure is not changed (step S206). ), An additional folding process is executed (step S207). In other words, if there is a sheet that is not creased in step S202, in other words, a sheet bundle that is a mixture of creased paper and non-creased paper is subjected to additional folding processing, the paper that is not creased. The number of additional folds or pressure is not changed in accordance with the paper information or bookbinding information. Accordingly, in step S202, it is determined whether or not the additional folding operation is changed according to the presence or absence of the paper folding.

  In this embodiment, the processing or determination processing from step S201 to step S206 is executed by the CPU_PR1 of the image forming apparatus PR, and the additional folding process is executed by an instruction of the CPU_B1 of the folding processing apparatus B. This is because when the system is constructed as an image forming system, the CPU_PR1 of the image forming apparatus PR functions as the main CPU of the system, and the CPU_B1 of the folding processing apparatus B performs step S201 from the image forming apparatus PR or the crease attaching apparatus A. It is also possible to obtain information corresponding to 204 to determine whether or not to change the number of additional folds or the pressure, and to execute the processing of step S205 and step S206.

As described above, according to the present embodiment,
1) Since the number and pressure of the additional folding process are reduced according to the presence / absence of the crease process, the productivity can be improved or the power consumption can be reduced.
2) By reducing the number of additional foldings, the time can be reduced and productivity is improved.
3) By reducing the additional folding pressure, the driving energy can be reduced and the power consumption can be reduced.
4) When the number of times of additional folding or the pressure is reduced, it is executed according to the paper type or paper thickness, so that it is easy to make a control decision.
5) For a sheet bundle without a crease, the number of additional folds or the pressure is the same as the initial setting, so that additional folds can be reliably performed.
6) When only the cover is creased with saddle stitching, or when papers that have not undergone crease processing are mixed, not all papers are creased. Therefore, the number of additional folds or pressure is not reduced. Thereby, additional folding can be performed reliably. There are effects such as.

8 Folding plate 9 Folding roller pair 13 Additional folding roller A Folding device PR1, B1 CPU

JP 2008-81258 A

Claims (9)

A folding means that is disposed at a subsequent stage of the crease means for making a crease on the paper, and folds the paper or the paper bundle;
An additional folding means for further folding the folded portion of the folded sheet or sheet bundle;
Control means for controlling the folding means and the additional folding means;
In the paper folding device provided with
The paper folding apparatus, wherein the control means changes the operation of the additional folding means based on paper information or bookbinding information. The paper folding apparatus according to claim 1, wherein
The sheet folding apparatus, wherein the change is the number of additional folding. The paper folding apparatus according to claim 1, wherein
The sheet folding apparatus, wherein the change is an additional folding pressure. In the paper folding device according to any one of claims 1 to 3,
The change of the operation is executed when the sheet has a fold and the sheet is a paper type specified in advance. In the paper folding device according to any one of claims 1 to 3,
The change of the operation is executed when the sheet has a predetermined thickness when the sheet has a fold and the sheet is not specified in advance. The paper folding apparatus according to claim 1, wherein
In the case where the control unit performs additional folding processing on a sheet bundle in which a sheet with creases and a sheet without creases is mixed, the control means determines whether or not to make the change based on the sheet information or bookbinding information of the sheets without creases. A sheet folding device characterized by determining. A paper folding device according to any one of claims 1 to 6,
An image forming apparatus for forming an image on paper;
A scoring device that performs a scoring process on the paper carried from the image forming device;
An image forming system comprising: The image forming system according to claim 7.
The image forming apparatus includes:
Recognition means for recognizing the paper information or bookbinding information;
Determining means for determining the condition to be changed;
Instruction means for instructing the control means to change the operation of the additional folding means based on the determination result of the determination means;
An image forming system comprising: In a paper additional folding method for further folding a folded paper or a fold portion of a paper bundle,
A first step of recognizing paper information or bookbinding information;
A second step of determining whether or not all the sheets of the sheet bundle are creased based on the recognized information;
A third step of determining whether or not the paper type is specified in advance when the paper is not a specific paper in the second step;
A fourth step of determining whether or not the paper thickness is predetermined;
When the crease is applied in the second step and the specific paper type is used in the third step and when the paper thickness is the specified thickness in the fourth step, the number of additional folds is reduced or the increased folding pressure is increased. A fifth step of reducing and increasing the folding;
If there is a sheet that has not been creased in the second step and the paper type is not a prescribed paper type in the fourth step, the sixth folding is performed without changing the number of additional foldings or the additional folding pressure. Process,
A method for additionally folding a sheet, comprising:

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