JP2011093684A - Sheet folding device and image forming system having the same - Google Patents

Sheet folding device and image forming system having the same Download PDF

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Publication number
JP2011093684A
JP2011093684A JP2009250999A JP2009250999A JP2011093684A JP 2011093684 A JP2011093684 A JP 2011093684A JP 2009250999 A JP2009250999 A JP 2009250999A JP 2009250999 A JP2009250999 A JP 2009250999A JP 2011093684 A JP2011093684 A JP 2011093684A
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path
sheet
folding
switchback
carry
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JP2009250999A
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JP5595009B2 (en
Inventor
Hironori Imazu
Shinichi Ito
Kenichi Sano
Mizuho Shirokura
裕紀 今津
真一 伊藤
健一 佐野
瑞穂 白倉
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Nisca Corp
ニスカ株式会社
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Publication of JP2011093684A publication Critical patent/JP2011093684A/en
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Abstract

In an apparatus configuration including a path that is not folded and a path that is folded between a carry-in port and a carry-out port, a sheet conveyance route from the carry-in port to the carry-out port is configured to be small and compact.
A first conveyance path 32 that guides a sheet from a carry-in entrance 30 to a carry-out exit 31 without folding the sheet, a second conveyance path 33 that folds a sheet from the carry-in entrance, and the path 33 are arranged. And a folding processing means for folding the sheets. The second path 33 is arranged so as to intersect the first path 32, a path end (first switchback path 34) for guiding the sheet of the second path 33 to the folding position, and the folding position. A path end portion (second switchback path 35) that guides the folded sheet from the downstream side to the downstream side is disposed in an area that is vertically or horizontally opposed via the first conveyance path 32. That is, when the first transport path 32 is configured as a straight path in the horizontal direction, the path 34 is disposed above the path and the path 35 is disposed below the path.
[Selection] Figure 3

Description

The present invention relates to a sheet folding apparatus that folds, for example, a sheet on which an image has been formed into one-half, one-third, and the like, and relates to an improvement in a folding mechanism, particularly a sheet conveyance path for folding processing.

In general, this type of sheet folding apparatus is widely known as an apparatus for folding and finishing a sheet on which an image has been formed by an image forming apparatus such as a printing machine, a printer apparatus, or a copying machine at a predetermined folding position. For example, Patent Document 1 proposes a device that is connected to a paper discharge port of an image forming apparatus and folds a sheet on which an image has been formed for filing and carries it out for subsequent binding processing.

Thus, the sheet folding apparatus that folds the sheet in half or one-third and carries it out is configured as a post-processing apparatus of the image forming apparatus, or is built in the image forming apparatus or the binding processing apparatus. It is configured as a unit. Various folding specifications are known for filing according to the purpose of use, such as 1/2 folding, 1 / 3Z folding, and 1/3 letter folding.

As described above, the folding device that is connected to or built in the image forming apparatus, the binding device (finisher device, bookbinding device), or the like has a path (paper discharge path) for carrying out the sheet to the carry-out exit without folding processing. A path (folding path) for carrying out the sheet from the carry-out port after folding the sheet is required. For this reason, in Patent Document 1, a paper discharge path is provided between a carry-in port and a carry-out port formed in the apparatus housing, and a folding processing path is arranged below the paper discharge path.

A folding roll for folding the sheet in half or 1/3 and a path for nipping the sheet from the folding position to the folding roll are arranged in the folding processing path. In other words, the sheet is positioned in a wing shape at the folding position and inserted between the pair of rollers for folding.

Therefore, in the apparatus of Patent Document 1, the paper discharge path is arranged in the horizontal direction of the apparatus, and the folding processing path is arranged vertically above and below the path. This is because the apparatus housing is slimmed down in the sheet discharging direction to save the area occupied by the apparatus.

The apparatus disclosed in Patent Document 2 guides a sheet conveyed from an image forming apparatus to a folding processing path arranged vertically in a direction perpendicular to the sheet discharge direction, and folds the sheet along this path and discharges the sheet. After being deflected in the direction, it is carried out to the outside. Similarly, the apparatus disclosed in Patent Document 3 also guides the sheet entering in the horizontal direction from the carry-in entrance to the folding processing path by deflecting the sheet in the vertical direction.

As described above, the conventional apparatus arranges the folding processing path in a direction orthogonal to the sheet carrying-in / out direction. A folding mechanism is arranged at an intermediate position of the path, and the path is provided in a wing shape so that the folding position of the sheet is matched before and after the folding mechanism. In consideration of 1/3 folding, the folding processing path is configured to have a path length of 2/3 of the folded sheet at the front and rear of the folding mechanism.

JP2009-018494 (FIG. 1) Patent 414496 (Fig. 1) Japanese Patent No. 4175642 (FIG. 2)

As described above, the conventional sheet folding apparatus has a problem that the entire apparatus is enlarged because the folding processing path and the folding mechanism are arranged on one side of the upper or lower side with respect to the direction in which the sheet is carried in and out. There is a known problem that the transport mechanism and the folding mechanism arranged in the path and the drive mechanism thereof are also large. That is, since the folding processing path is arranged above or below the sheet carry-in / out entrance, this path requires a path length longer than the sheet length depending on the folding specifications such as 1/3 folding.

Therefore, most of the space inside the apparatus is occupied by the folding processing path and the folding mechanism, and the mounting density of the processing path affects the downsizing of the apparatus. For example, in the conventional apparatus configuration in which the folding processing path is arranged below the sheet carry-in / out path, the upper part of the carry-in / out path becomes a dead space, which causes an increase in the size of the apparatus.

In addition, since the conventional apparatus is forced to dispose the folding mechanism at a position far away from the sheet carry-in / out path, for example, the conveyance mechanism of the carry-in / out path and the conveyance mechanism of the folding processing mechanism are made common. It is difficult to make the device more complicated and larger.

Therefore, the present inventor can increase the space occupied by this path by distributing the sheet folding path above and below the sheet carry-in / out path, and at the same time simplify the transport mechanism and its drive mechanism. It came to the idea that it was possible.

The present invention has a small and compact sheet conveyance path from the carry-in port to the carry-out port in the apparatus configuration including a path that is not folded and a path that is folded between the carry-in port and the carry-out port. The main problem is to provide a sheet folding apparatus capable of simplifying the mechanism for doing so.

In order to achieve the above object, the present invention provides a first conveyance path for transferring a sheet without folding between a carry-in port and a carry-out port arranged opposite to each other, and a first conveyance path for folding the sheet and transferring it to a carry-out port. And a folding processing unit that folds the sheets disposed on the second conveying path. One of the path end for guiding the sheet of the second transport path to the folding position of the folding processing means and the path end for guiding the folded sheet from the folding position to the downstream side are one with respect to the first transport path. The second conveyance path and the first conveyance path intersect with each other so that the other is disposed below the other.

In the following, the configuration will be described in detail. An apparatus for folding a sheet from the carry-in entrance (30) and carrying it out to the carry-out exit (31), without carrying out the folding process of the sheet from the carry-in entrance (30). A first conveyance path (32) that guides to the exit (31), a second conveyance path (33) that folds the sheet from the carry-in entrance and guides it to the carry-out exit, and a second feed path that is arranged in the second carry path from the carry-in entrance Folding processing means (48) for folding the sheets.

The second transport path (32) is arranged so as to intersect the first transport path (33), and a path end (first described later) for guiding the sheet of the second transport path 33 to the folding position Np1. The switchback path 34) and a path end portion (second switchback path 35 described later) for guiding the folded sheet downstream from the folding position Np1 face each other vertically or horizontally via the first transport path 32. Place in the area.

The first transport path (32) is configured as a substantially linear path in the horizontal direction across the apparatus housing, for example, and the second transport path (33) is directed toward the folding position in order to primarily fold the sheet. The first switchback path to be fed and the second switchback path for transporting the first folded sheet toward the folding position for the second folding are bent, for example, to form a substantially S-shaped path. Space occupied by the processing path can be saved.

In the present invention, the first conveyance path for carrying out the sheet without folding between the carry-in port and the carry-out port, and the second conveyance path for carrying out the sheet folding process with respect to this path are placed at the folding position. A path end that feeds the sheet toward and a path end that guides the folded sheet from the folding position downstream, with one path end above the first transport path and the other path end downward. Since they are arranged, the following effects are obtained.

With respect to the first transport path for carrying out the sheet without folding, a folding processing path (second transport path) having a longer path length than this path is arranged with one end of the path at the top and the other at the bottom. Therefore, it is possible to increase the density of the path configuration occupying the apparatus housing, and thus the apparatus can be made compact and compact.

In addition, a folding mechanism such as a folding roll disposed in the central portion of the folding processing path is disposed in the vicinity of the first conveyance path. For example, a path opening / closing mechanism for sheet jam processing disposed in the folding mechanism section, It becomes possible to also serve as a path opening / closing mechanism for sheet jam processing of one conveyance path. Similarly, for example, the folding roll and the sheet conveying roller of the first conveying path can be used together, and the sheet conveying mechanism and the folding processing mechanism can be simplified with a simple structure.

Further, according to the present invention, a first switchback path that guides the leading edge of the sheet for primary folding of the folding processing path is disposed above the first transport path, and a second switch that guides the leading edge of the folded sheet for secondary folding. By disposing the back path below the first transport path and disposing the storage stacker for storing the folded sheet below the second switchback path, the apparatus can be further reduced in size and size. In other words, it is possible to further increase the density in the apparatus housing by arranging the first switchback path that requires a long path length above and the second switchback path and storage stacker having a short path length below. .

1 is an explanatory diagram of an overall configuration of an image forming system according to the present invention. The principal part expansion explanatory drawing of the post-processing apparatus in the system of FIG. FIG. 2 is an explanatory diagram of an overall configuration of a sheet folding device in the system of FIG. 1. FIG. 4 is an enlarged explanatory view of a main part in the sheet folding apparatus of FIG. 3. Explanatory drawing of the layout structure of the folding roll of FIG. FIG. 4 is an explanatory diagram of a layout configuration of a registration mechanism and a secondary folding deflecting unit in the sheet folding apparatus of FIG. 3. FIGS. 7A and 7B are explanatory views showing the operation of the registration mechanism in FIG. 6A, in which the gate stopper is in the operating position, FIG. 6B is in the middle of the movement of the gate stopper to the retracted position, and FIG. Shows the state. FIGS. 4A and 4B are diagrams illustrating a state of a sheet folding operation in the apparatus of FIG. 3, in which FIG. 3A illustrates a state where a sheet is registered and FIG. 3B illustrates a state where the sheet is carried into a first switchback path. FIGS. 4A and 4B are diagrams illustrating a state of a sheet folding operation in the apparatus of FIG. 3, in which FIG. 3A illustrates a state in which the sheet is primarily folded at a first nip portion, and FIG. Indicates the state. FIGS. 4A and 4B are diagrams illustrating a state of a sheet folding operation in the apparatus of FIG. 3, in which FIG. 3A illustrates a state in which the sheet is folded from the second switchback path at the second nip portion, and FIG. Is shown in a state of being carried out in the paper discharge direction. FIG. 6 is a diagram illustrating a state of a sheet folding operation, where (a) illustrates an operation of a secondary folding deflecting member that guides the leading edge of the sheet to the second nip portion when the bi-fold mode is executed, and (b) illustrates a folding processing operation. The flowchart which shows. It is explanatory drawing of the sheet folding specification in the sheet folding apparatus of this invention, (a) is a mode which folds a sheet | seat inside three at 1/3 position, (b) is a mode which Z-folds a sheet | seat at 1/3 position. (C) shows a mode in which the sheet is Z-folded at a 1/4 position. Explanatory drawing of the drive mechanism in the apparatus of FIG. Explanatory drawing of embodiment of the folding deflection | deviation member different from FIG. Explanatory drawing of the control structure in the system of FIG.

Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 shows an image forming system according to the present invention. This system includes an image forming apparatus A and a post-processing apparatus C, and a sheet folding apparatus B is attached to the post-processing apparatus C as a unit.

The image forming apparatus A is configured as a printer, a copier, a printer, or the like that sequentially forms images on sheets. The illustrated one is an image forming unit 7, a document reading unit 20, and a feeder unit (document feeding device) 25 as a composite copying machine having a copying machine function and a printer function. Further, the post-processing apparatus C is connected to the main body discharge port 18 of the image forming apparatus A, and is configured to perform post-processing such as folding, punching, stamping, and binding on the image-formed sheet. Has been. A folding processing unit (sheet folding device) B for folding the image-formed sheet is integrally provided in the post-processing device C. Hereinafter, the sheet folding apparatus B, the image forming apparatus A, and the post-processing apparatus C will be described in this order.

[Sheet folding device]
The sheet folding apparatus B is built in the image forming apparatus A or the post-processing apparatus C, or is configured as an independent apparatus (stand-alone configuration). The illustrated one is arranged between the image forming apparatus A and the post-processing apparatus C to constitute an image forming system. The sheet folding device B is attached to the post-processing device C as an optional unit (the configuration will be described later).

Therefore, the sheet folding apparatus B is shown in FIG. 3 as a whole, but the apparatus housing 29 is provided with a carry-in port 30 and a carry-out port 31, and the carry-in port 30 is connected to the main body discharge port 18 of the upstream image forming apparatus A. In addition, the carry-out port 31 is arranged at a position continuous with the sheet receiving port 69 of the downstream post-processing apparatus C. As shown in FIG. 3, the carry-in port 30 and the carry-out port 31 are disposed so as to cross the device housing 29.

Between the carry-in port 30 and the carry-out port 31, the sheet from the carry-in port 30 is folded without being folded, and the sheet from the carry-in port 30 is folded. The 2nd conveyance path | route 33 carried out to the carry-out exit 31 is arrange | positioned. In this path, a “conveying mechanism” for transferring the sheet in a predetermined direction and a “folding mechanism” for folding the sheet are arranged.

[Route configuration]
As shown in FIG. 3, a first transport path (hereinafter referred to as “first path”) 32 is disposed in the apparatus housing 29 between the carry-in port 30 and the carry-out port 31. As shown in the figure, this path may be arranged in a horizontal direction as a straight path, or may be arranged in a vertical direction even if it is constituted by a curved path. As described above, the first path 32 guides the sheet from the carry-in entrance 30 to the carry-out exit 31 without folding the sheet.

The second transport path (hereinafter referred to as “second path”) 33 is configured as a path for folding the sheet from the carry-in entrance 30. The second path 33 is provided with a folding processing means 48, which will be described later, at a folding position Np1 (Np2), and a first switch that guides the leading edge of the sheet for primary folding to the folding position (first nip portion described later) Np1. The back path 34 and a second switchback path 35 for guiding the leading end of the folded sheet for secondary folding of the folded sheet to a folding position (second nip portion described later) Np2. The second path 33 is continuously provided with a third transport path (hereinafter referred to as “third path”) 36 for transporting the folded sheet from the second nip portion Np2 toward the transport outlet 31.

The second path 33 intersects with the first path 32 and includes a path end portion that guides the sheet above the first path 32 and a path end portion that guides the sheet below the first path 32. . In the embodiment of FIG. 3, the first switchback path 34 that guides the leading edge of the sheet to the first nip portion Np <b> 1 to be folded is located above the first path 32, and the second switchback that guides the folded sheet to the downstream side. The path 35 is disposed below the first path 32.

As described above, the first path 32 and the second path 33 are arranged so as to intersect with each other, but the first switchback path 34 that guides the sheet to the primary folding position (first nip portion described later) Np1 is the first path. A second switchback path 35 for guiding the folded sheet to the downstream side may be disposed above the path 32 below the path 32.

When the first path 32 is arranged in the vertical direction, the first switchback path 34 is on the right side (or left side) of the first path 32 in the vertical direction, and the second switchback path 35 is on the left side (or right side) of the path. ). In the embodiment shown in FIG. 3, the second switchback path 35 is configured to reverse the sheet feeding direction so as to guide the folded sheet to the second nip portion Np2 in order to perform the secondary folding of the sheet. However, when the sheet is not folded second, it is possible to use a straight path.

A third path 36 that guides the folded sheet to the carry-out port 31 is connected to the second path 33. The illustrated third path 36 is provided between the second nip portion Np2 for secondary folding of the sheet and the carry-out port 31. The third path 36 is provided with a paper discharge path 37 for guiding the folded sheet from the paper discharge outlet 51 different from the carry-out port 31 to the storage stacker 65.

The first switchback path 34 configured as described above is configured as a circularly curved path having a curvature R1 as shown in FIG. 3, and the second switchback path 35 has a curvature R2 shown in FIG. It has a circularly curved path. Further, the paper discharge path 37 connected to the third path 36 is also configured as a circularly curved path having a curvature R3.

Then, the path length (L1) of the first switchback path 34 for guiding the sheet from the first path 32 to the primary folding position (first nip portion) Np1, and the primary folded sheet at the secondary folding position (L1). The path length (L2) of the second switchback path 35 for guiding to the second nip portion Np2 is configured such that path length L1> path length L2.

Further, the path length L3 of the sheet discharge path 37 for guiding the folded sheet from the second nip portion Np2 to the storage stacker 65 is configured to satisfy L3 <L2 <L1. This is because when the primary folding position (first nip portion) Np1 is arranged in the vicinity of the first path 32, each path length becomes L3 <L2 <L1, resulting in a compact path configuration.

The first switchback path 34 is an arcuate path having a curvature R1, the second switchback path 35 is a curvature R2, and the paper discharge path 37 is an arcuate path having a curvature R3. The curvature is set so that the first switchback path 34 is larger than the second switchback path 35 (curvature R1> curvature R2).

Therefore, the frictional resistance of the sheet passing through the first switchback path 34 having a large curvature is smaller than the frictional resistance of the sheet passing through the second switchback path 35 having a small curvature. Further, the curvature R3 of the sheet discharge path 37 for guiding the folded sheet to the storage stacker 65 is set such that curvature R3 <curvature R2 <curvature R1. Accordingly, the frictional resistance for the sheet to pass through each path is as follows: first switchback path 34 <second switchback path 35 <discharge path 37.

On the other hand, the strength of the sheet is the lowest in the single sheet passing through the first switchback path 34, the secondary folded sheet passing through the second switchback path 35 is intermediate, and the secondary sheet passing through the paper discharge path 37. The folded sheet is the highest. Therefore, setting the above conditions according to the strength of the waist of the sheet conveying the path minimizes the space occupied by the path without causing sheet jam.

The first switchback path 34 and the second switchback path 35 constituting the second path 33 are formed in an S-shaped curve as shown in FIG. A paper discharge path 37 from the second switchback path 35 to the storage stacker 65 is formed in an inverted S-curve. A storage stacker 65 is disposed below the second switchback path 35 and connected by a paper discharge path 37.

Accordingly, the first switchback path 34 having the longest path length is arranged above the first path 32, the second switchback path 35 and the paper discharge path 37 having short paths are arranged below the first path 32, and further below that. A storage stacker 65 is disposed in the storage. With such a layout configuration, the inner space of the device housing 29 is concentrated.

[Folding processing means]
A folding processing means 48 for folding the sheet is disposed in the second path 33 described above. The folding processing means 48 includes folding roll pairs 41b, 49, and 50 for folding the sheet in half or in three, and folding deflecting means 53 and 54 for guiding the sheet fold to the nip portion Np1 (Np2). When the sheet is folded in two, it is composed of two roll pairs and one folding deflecting means, and when the sheet is folded in three, it is composed of three or four roll pairs and two folding deflecting means.

In the apparatus of FIG. 3, the folding roll pair includes a first roll 41b and a second roll forming a first nip portion Np1 and a second nip portion Np2 because of a three-fold specification relationship in which the sheet is folded first and then secondarily. 49 and a third roll 50. The folding deflection means includes a primary folding deflection member 53 and a secondary folding deflection member 54. The folding processing mechanism of this tri-fold specification will be described below.

[Route switching means]
As described above, the first path 32 and the second path 33 are arranged to intersect each other, the first switchback path 34 is above the first path 32, and the second switchback path 35 is below the first path 32. In the second path 33, a third path 36 for returning the folded sheet from the second nip portion Np2 to the first path 32 is connected.

As shown in FIG. 3, the first route and the second route intersect at Cp1, and the third route and the first route intersect at Cp2, as shown in FIG. Therefore, the path switching for guiding the seat from the first path 32 to the first switchback path 34, the path guide for guiding the seat from the first switchback path 34 to the second switchback path 35, and the second switchback path 35 A route guide for guiding the sheet to the first route 32 is required.

The apparatus shown in the figure is characterized in that the above-mentioned three-way guide is constituted by the following one path switching means 63. A route switching means 63 is disposed on the first route 32 at the intersection with the second route 33. As shown in FIG. 3, the path switching means 63 is pivotally supported so that the base end portion 63x can swing on a device frame outside the path (the support shaft 62x of the carry-out roller 62a is shown). A guide surface 63a and a back guide surface 63b are formed.

The front guide surface 63a guides the sheet sent to the first path 32 in the solid line posture of FIG. 3 from the first path 32 to the first switchback path 34 of the second path 33. At the same time, the back guide surface 63 b returns the folded sheet sent to the third path 36 to the first path 32. Further, the path switching unit 63 directly sends the sheet sent to the first path 32 in the posture of the broken line in FIG. 3 to the carry-out port 31 without being carried into the second path 33.

In short, the second conveyance path intersects the first conveyance path at the first intersection Cp1 so as to carry in the sheet from the carry-in entrance, and the third conveyance path carries the folding processed sheet toward the carry-out exit. As described above, a path switching unit 63 that switches the sheet conveyance direction is disposed at the first intersection Cp1 and the second intersection Cp2. This path switching means 63 is composed of a path switching member (plate-shaped guide piece) 63 that advances and retreats in the first path, and guides the sheet from the first path 32 to the second path 33 by its front guide surface 63a. The back guide surface 63b guides the sheet from the third path to the first path 32.

The path switching member 63 has a first guide posture (a broken line in FIG. 3) for directly sending a sheet from the carry-in entrance 30 to the carry-out port 31 through the first path 32, and a sheet fed from the carry-in entrance 30 to the first transport path. Drive means (operation solenoid; not shown) that changes the position between the second guide position (solid line in FIG. 3) that guides the sheet conveyed from the third path 36 to the first path 32 while guiding the sheet to the second transport path; Is provided. That is, the illustrated path switching member 63 is formed of a plate-like piece that swings about the support shaft 62x, and an operating solenoid and a return spring are connected to a base end portion thereof.

Thus, the path switching member 63 guides the sheet from the first path 32 to the first switchback path 34 in the second guide posture, and guides the sheet from the switchback path to the first nip portion Np1. At the same time, the folded sheet from the third path 36 is returned to the first path 32 in the second guide posture.

[Folding roll configuration]
In the second path 33, the first roll 41b, the second roll 49, and the third roll 50 are arranged so as to be in pressure contact with each other. A first nip portion (first folding position) Np1 is formed at the pressure contact between the first roll 41b and the second roll 49, and the sheet is applied to the pressure contact between the second roll 49 and the third roll 50. A second nip portion (second folding position) Np2 for secondary folding is formed.

In particular, in the illustrated apparatus, the circumferential surface of the first roll 41b is disposed at a position facing the first path 32, and a pinch roller (floating roller) 41a is pressed against the circumferential surface of the roll. As a result, the sheet in the first path 32 is conveyed by the first roll 41b and the pinch roller 41a, and there is no need to provide a special conveying member and its drive mechanism in the first path 32.

In addition, the first, second, and third roll diameters are set such that the second roll diameter is a maximum of, for example, 30 mm, the first and third roll diameters are 2 mm, and the second roll 49 located in the center is the maximum diameter ( For example, the reason will be described later. Further, an additional folding roller (drive roller) 64 is pressed against the second roll 49 on the downstream side of the pressure contact with the third roll 50.

[Configuration of folding deflection means]
As described above, the folding roll composed of the three rolls (41b, 49, 50) has a primary folding deflection member 53 at the first nip portion Np1 and a secondary folding deflection member 54 at the second nip portion Np2. Are arranged to guide the sheet folds to the respective nip portions (pressure contact points). In the apparatus shown in FIG. 3, the primary folding member 53 and the secondary folding member 54 have the same structure, and therefore the structure of the primary folding member 53 will be described. The folding deflection member 53 includes a driven roller 53a, a guide member 53b, and an elevating member 53c as shown in FIGS.

As shown in FIG. 5, the first nip portion Np1 for first folding the sheet is composed of a first roll 41b and a second roll 49, and the first roll 41b is arranged on the upstream side and the second roll 49 is arranged on the downstream side. Yes. Therefore, the driven roller 53 a is disposed at a position in contact with the peripheral surface of the second roll 49. And the guide member 53b is provided with the curved guide surface along the surrounding surface of the 1st roll 41b located in an upstream.

The driven roller 53a and the guide member 53b are supported by an elevating member 53c. The elevating member 53c is constituted by a bracket member (frame member) having an appropriate shape, and the driven roller 53a is rotatably supported by the elevating member 53c, and at the same time, the guide member 53b is fixed. The elevating member 53c is supported by a guide rail provided on the apparatus frame, and the standby position where the driven roller 53a is in contact with the peripheral surface of the second roll 49 (the broken line position in FIG. 4) and retracted out of the second path 33. It is configured to move up and down between positions (solid line positions in FIG. 4). A shift means 56, which will be described later, is connected to the elevating member 53c, and the driven roller 53a and the guide member 53b are moved between the operating position and the standby position.

Therefore, the driven rollers 53a and 54a and the guide members 53b and 54b are set in the positional relationship shown in FIG. In the first nip portion Np1, the sheet is fed from the carry-in port 30 by the first roll 41b and the pinch roller 41a pressed against the first roll 41b. The pressure contact of the pinch roller 41a is indicated by p1 in FIG.

The driven roller 53a is in pressure contact with the second roll 49 located on the downstream side, and the pressure contact is indicated by p2 in FIG. Therefore, when guiding the fold position of the sheet to the first nip portion Np1, the upstream side of the sheet is given a conveying force by the pressure contact p1, and is guided to the first nip portion Np1 along the peripheral surface of the first roll 41b. . Further, the downstream side of the sheet is given a conveying force by the pressure contact p <b> 2 and is guided to the first nip portion Np <b> 1 along the peripheral surface of the second roll 49.

At this time, the conveyance length Lx between the pressure contact p1 and the first nip portion Np1 and the conveyance length Ly between the pressure contact p2 and the first nip portion Np1 are set to Lx> Ly. The position of the driven roller 53a is set according to such a conveyance length relationship. The above-mentioned guide member 53b forms a curved guide surface having a curved shape along the peripheral surface of the first roll 41b having a large conveyance length.

That is, conventionally, since the blade member for guiding the sheet fold to the fold nip (Np1, Np2) is provided separately from the sheet steering means, the cause of the positional shift or wrinkle at the fold is caused by the timing shift acting on the sheet. It was. In order to solve this, the illustrated apparatus sets the conveyance length Lx of the first roll 41b on the upstream side of the sheet toward the first nip portion Np1 and the conveyance length Ly of the second roll 49 on the downstream side to [Lx> Ly], and at the same time, the curved guide surface of the guide member 53b is configured so that the sheet runs along the peripheral surface of the first roll 41b having a long conveying length, and the driven roller 53a and the guide member 53b are simultaneously moved from the standby position. The position has been moved to the operating position.

With this configuration, the sheet fold can be accurately guided to the nip portion Np1 without using any special folding blade means. As is apparent from FIG. 5, in order to set the transport length to [Lx> Ly], it is necessary to configure the roll diameter of the driven roller 53a to be smaller than the roll diameter of the first roll 41b located on the upstream side. .

Similarly, the secondary folding deflecting member 54 applies a conveying force to the sheet at the first nip portion Np1 of the second roll 49 positioned on the upstream side, and the conveyance length Lx from this point to the second nip portion Np2 is applied. Thus, the pressure contact p3 between the driven roller 54a and the third roll 50 located on the downstream side and the conveyance length Ly between the second nip portion Np2 are set to [Lx> Ly].

The curved guide surface of the guide member 54b is configured so that the sheet is placed along the peripheral surface of the second roll 49 having a long conveying length. The secondary folding deflecting member 54 and the primary folding deflecting member 53 move reciprocally so that when one is in the operating position, the other is in the standby position. This is because the elevating member 53c and the elevating member 54c are raised and lowered by the same driving means (described later).

[Drive mechanism]
Next, the drive mechanism of the first path 32, the second path 33, and the folding processing means 48 will be described. As shown in FIG. 4, the first path 32 is provided with a pair of carry-in rollers 40 (first transport means) at the carry-in entrance 30 and a pinch roller 41 a (second transport means) on the downstream side thereof. A carry-out roller pair 62 is provided.

The carry-in roller pair 40 includes a pair of rollers 40a and 40b, and a conveyance motor Mf described later is connected to one of the rollers 40b. Similarly, the carry-out roller 62 is also composed of a pair of rollers 62a and 62b, and a conveyance motor Mf is connected to one of the rollers 62b. Further, the pinch roller 41a is arranged to rotate following the first roll 41b, and this roll 41b is connected to the transport motor Mf.

As shown in FIG. 3, the first switchback path 34 and the second switchback path 35 constituting the second path 33 are provided with conveying means such as a roller and a belt for applying a conveying force to the sheet. Not. Therefore, the first switchback path 34 is provided with a first roll 41b and a pinch roller 41a that is pressed against the first roll 41, and a conveying force in the loading direction for loading the sheet into the path is provided, and a driven roller 53a that is pressed against the second roll 49 is provided. A conveying force for transferring the sheet from the path to the primary folding position Np1 is applied.

Further, the second switchback path 35 is given a conveying force for carrying the sheet into the path at the nip portion between the first roll 41b and the second roll 49, and the conveying force for feeding the sheet from the path to the secondary folding position Np2. Is configured to be applied by a driven roller 54 a of the secondary folding deflecting member 54. The third path 36 connected to the second switchback path 35 is provided with a conveying force for the additional folding roller 64 pressed against the second roll 49 to carry the folded sheet toward the carry-out roller 62 as shown in FIG. Has been granted. Therefore, no conveying means having a special drive mechanism is arranged in the third path 36.

Further, in the above-described third path 36, a paper discharge path 37 that guides the folded sheet to the storage stacker 65 without being transferred to the carry-out port 31 is disposed, and a paper discharge roller 67 is provided in this path. .

Therefore, as shown in FIG. 13, the pair of carry-in rollers 40 and the carry-out rollers 62 in the first path 32, the first roll 41 b, the second roll 49, the third roll 50, and the paper discharge path 37 of the folding processing unit 48. Drive of the conveyance motor Mf is transmitted to the paper discharge roller 67. That is, the drive of the conveyance motor Mf is transmitted to the first roll 41b by belt transmission, and the first roll 41b, the second roll 49, and the third roll 50 are driven and transmitted by gears or the like so as to have the same peripheral speed.

Further, a shift motor Ms is connected so that the elevating member 53c of the primary folding deflecting member 53 and the elevating member 54c of the secondary folding deflecting member 54 are moved reciprocally between the standby position and the operating position. The motor Ms is composed of a forward / reverse motor, and pinions 53p and 54p are engaged with racks 53r and 54r formed on the first elevating member 53c and the second elevating member 54c. When the shift motor Ms rotates forward, the first elevating member 53c moves from the standby position to the operating position, and when it rotates in the reverse direction, the second elevating member 54c moves from the standby position to the operating position. . Therefore, the shift motor Ms, the racks 53r, 54r, and the pinions 53p, 54p constitute a shift means 56 (see FIG. 13) for moving the lifting members 53c, 54c up and down.

[Sheet edge detection sensor]
As described above, the first sensor S <b> 1 that detects the edge of the sheet is disposed in the first path 32, and detects the edge (leading edge and trailing edge) of the sheet that is carried into the first switchback path 34. A second sensor S2 for detecting the edge of the sheet carried into the second switchback path 35 is disposed. The sensors S1 and S2 detect the edge of the sheet in order to determine the fold position of the sheet, and the operation thereof will be described later together with a folding specification described later.

[Registration mechanism]
On the other hand, a registration mechanism is disposed in the first path 32 between the pair of carry-in rollers 40a and 40b and the pinch roller 41a. As shown in FIGS. 6 and 7, in this registration mechanism, the first conveying means 40 constituted by the pair of carry-in rollers 40a and 40b and the second conveying means 41 constituted by the pinch roller 41a and the first roll 41b are separated from each other. It arrange | positions across Lz. A gate stopper means 42 for locking the leading edge of the sheet and a resist area Ar (space) for bending and deforming the sheet are formed at the interval Lz. The pinch roller 41a is made of polyacetal (POM), and the first roll 41b is made of a rubber material.

The gate stopper means 42 is provided with a stopper member 43 provided with a regulating surface 43s that abuts and locks the leading end of the sheet, and the regulating surface 43s is placed between a locking position Ps in the first path and a standby position Pw outside the path. A stopper driving means 44 for moving the position is configured.

The illustrated stopper member 43 is a lever member, the base end of which is pivotally supported by the apparatus frame so as to swing around the support shaft 43x, and the leading end of the sheet moving along the first path 32 is engaged at the leading end. A regulating surface 43s to be stopped is formed. An urging spring 45 for urging the stopper member 43 to the standby position side and a stopper driving means (acting solenoid shown in the figure) 44 for moving the stopper member 43 to the locking position Ps against the spring are provided. Has been. Further, the resist area Ar is constituted by a space in which the sheet guide plate 32g constituting the first path 32 is bent as shown in FIG. 6 to deform the sheet into a loop shape.

Therefore, in the restricting surface 43s that is pivotally supported around the support shaft 43x, as shown in FIG. 7A, the seat locking point is moved from the operating position (locking position; solid line) Ps to the standby position ( The trajectory moving to Pw in the same figure passes through the pressure contact p1 of the second transport means 41 or passes through the vicinity thereof.

Therefore, the regulating surface 43s is moved along a trajectory that leads the sheet leading edge to the pressure contact p1 when the sheet leading edge is locked at the operating position (locking position) Ps and moved from this state to the standby position Pw. At the same time, the roller diameter of the first roll 41b is set larger than the roller diameter of the pinch roller 41a. The large-diameter roller 41b is disposed below the gravity direction, and the regulating surface 43s is disposed above the gravity direction. Therefore, the regulation surface 43s leads the sheet leading edge to the pressure contact p1 between the circumferential surface of the large diameter roller (first roll 41b).

Therefore, the operation of the gate stopper means 42 will be explained. At the operating position (locking position) Ps shown in FIG. 7, the restricting surface 43s is set in a posture substantially orthogonal to the first path 32 and moved from this position to the standby position Pw. In this case, the leading edge of the sheet is guided to the pressure contact p1 between the regulating surface 43s and the large-diameter roller circumferential surface, and the circumferential surface of the small-diameter roller (pinch roller 41a) is not blocked by the regulating surface 43s. . Accordingly, when the sheet is guided to the pressure contact p1 of the pair of rollers 41a and 41b, the leading end of the sheet is guided by either the regulating surface 43s or the large diameter roller 41b, so that the pressure contact p1 is relatively stable. Be guided to.

That is, at the operating position (locking position) Ps in FIG. 7A, the regulating surface 43s of the stopper member 43 locks the leading end of the sheet in a posture substantially orthogonal to the first path 32. For this reason, the sheet fed by the first conveying means 40 on the upstream side is locked at the leading end by the regulating surface 43s, and is bent in a loop shape as shown. At this time, the skew of the sheet is corrected.

Then, as shown in FIG. 4B, when the regulating surface 43s moves to the standby position side, the trajectory passes through the pressure contact p1 of the second transport means 41 or in the vicinity thereof in the direction indicated by the chain line x1 to x2. Move along a trajectory. Then, the sheet locked to the restriction surface 43s moves following the restriction surface. Accordingly, the leading edge of the sheet is guided to the pressure contact p1 while maintaining the skew corrected posture at the locking position Ps.

The regulating surface 43s waits at the standby position Pw after guiding the leading edge of the sheet to the pressure contact p1, as shown in FIG. When the stopper member 43 is moved from the operating position (locking position) Ps to the standby position Pw, the energization to the operating solenoid (stopper driving means) 44 is turned off, and the stopper member 43 is moved to the standby position Pw by the biasing spring 45. Return to.

[Second Embodiment of Folding Processing Unit]
The folding processing means 48 described with reference to FIGS. 3 to 7 includes the primary folding deflecting means 53 and the secondary folding deflecting means 54 mounted on the driven rollers 53a and 54a and the guide members 53b and 54b. In this example, the lift members 53c and 54c are connected to the shift motor Ms by racks 53r and 54r and pinions 53p and 54p. This folding mechanism can also be configured as shown in FIG.

In the embodiment shown in FIG. 14, the secondary folding deflecting member 86, the driven roller 86a, and the guide member 87 are individually mounted on the apparatus frame, and the guide member 87 waits in conjunction with the lifting and lowering operation of the driven roller 86a. It is configured to move up and down between the position and the operating position.

The secondary folding deflecting means 86 shown in FIG. 14 includes an elevating member 86b, a driven roller 86a mounted on the elevating member 86b, and a guide member 87 arranged separately from the elevating member 86b. The elevating member 86b is supported on a guide rail (not shown) of the apparatus frame so as to be reciprocally movable as in the above-described embodiment. A follower roller 86a is rotatably supported by the elevating member 86b.

On the other hand, the guide member 87 is supported by the drive shaft 41bx of the first roll 41b so that the bracket 87b can swing, and a curved guide surface 87a along the peripheral surface of the second roll 49 is formed at the tip. The guide member 87 is provided with a return spring 88 that urges the curved guide surface 87a toward the standby position where the curved guide surface 87a is retracted from the second switchback path 35 around the support shaft of the bracket 87b.

Therefore, the guide member 87 is engaged so that the curved guide surface 87a is moved from the standby position to the operating position in conjunction with the movement of the driven roller 86a from the standby position to the operating position. Therefore, the secondary folding deflecting means 86 configured in this manner reciprocates between the standby position and the operating position in the same manner as described above.

Further, the apparatus shown in FIG. 14 is driven by lifting levers 89 and 90 when the lifting member 85b of the primary folding deflecting means 85 and the lifting member 86b of the secondary folding deflecting means 86 are moved from the standby position to the operating position. The drive mechanism is configured to do this.
That is, the primary folding lift lever 89 and the secondary folding lift lever 90 are supported so that their base ends are swung by a rotation shaft, and a shift motor Ms (not shown) is connected to the rotation shaft. .

And the front-end | tip part of the raising / lowering levers 89 and 90 is arrange | positioned so that it may engage with the raising / lowering members 85b and 86b. The elevating members 85b and 86b are provided with urging springs (not shown) and always urge the driven rollers 85a and 86a toward the operating position.

In the apparatus of FIG. 14, the first sensor S1 disposed in the first path 32 is configured by a lever sensor as shown. Other configurations are the same as those of the apparatus shown in FIGS.

[Folding specification]
Next, the sheet folding method by the folding processing means 48 will be described with reference to FIG. A sheet on which an ordinary image is formed may be folded in two or three with a binding margin left for filing finish, or may be folded in two or three for letter finishing. In addition, in the case of tri-folding, there are cases where Z-folding and inner tri-folding are performed. In FIG. 12, (a) shows an inner trifold, (b) shows a 1 / 3Z fold, and (c) shows a 1 / 4Z fold.

  In the case of folding in half, the sheet sent to the second path 33 is folded by the first and second rolls 41b and 49 at the half position of the sheet size or at the half position leaving a binding margin at the end of the sheet. Fit (primary fold).

  In the case of tri-folding, the sheet sent to the second path 33 is moved to the 1/3 position of the sheet size by the first second rolls 41b and 49, or the 1/3 position of the sheet is left at the edge of the sheet. Fold together (primary fold). The folded sheet is folded by the second third rolls 49 and 50 at the 1/3 position (secondary folding) and sent to the third path 36.

  Further, in the case of tri-folding, when the inner tri-fold is performed as shown in FIG. 12A, the sheet fed to the second path 33 is moved to the sheet rear end side 1/3 position by the first second rolls 41b and 49. Folding is then performed, and then the 1/3 position on the sheet front end side is folded. Similarly, at the time of 1 / 3Z folding, the sheet fed to the second path 33 is folded at the 1/3 position on the sheet leading end side by the first second rolls 41b and 49, and then the sheet is folded at the 1/3 position on the sheet trailing end side. Match.

  Further, in the case of tri-folding, when the 1/4 position shown in FIG. 12C is Z-folded, the sheet fed to the second path 33 is fed by the first and second rolls 41b and 49 to the sheet rear end side 1/4. The position is folded, and then the half position of the sheet is folded.

[Control means]
The control means for folding the sheet is configured as follows. A control CPU is mounted on the sheet folding apparatus B described above, or a folding processing control unit is provided in the control unit of the image forming apparatus A. The control unit is configured so that the following operation is possible.

First, stopper means (not shown) for regulating the position of the sheet leading edge in the first switchback path 34 and the second switchback path 35 of the second path 33, or sensor means (S1, S2 shown in the figure) for detecting the position of the sheet leading edge. Is provided. In the illustrated apparatus, the sheet sensor S1 is disposed in the first switchback path 34, and the sheet sensor S2 is disposed in the second switchback path 35. The control unit 95 is configured to calculate the timing at which the sheet fold position reaches a predetermined position based on the sheet size information sent from the image forming apparatus A and the detection signal from the sensor S1 (S2).

Therefore, description will be made according to the control block diagram shown in FIG. In the image forming apparatus A, the control CPU 91 is provided with a control panel 15 and a mode setting unit 92. The control CPU 91 controls the paper feeding unit 3 and the image forming unit 7 according to the image forming conditions set on the control panel 15. Then, the control CPU 91 transfers data and commands necessary for post-processing such as “post-processing mode”, “job end signal”, and “sheet size information” to the control unit 95 of the post-processing apparatus C.

The control unit 95 of the post-processing apparatus C is a control CPU and includes a “folding processing control unit 95a” and a “post-finishing processing control unit 95b”. The folding processing control unit 95a includes a fold position calculating unit 97, a driver circuit for the transport motor Mf, and a driver circuit for the shift motor Ms. The control CPU 95 receives detection signals from the first sensor S1 and the second sensor S2.
Further, the control CPU 95 transmits “ON” and “OFF” control signals to the stopper driving means 44 provided in the gate stopper means 42 and the path switching means 63.

In the control CPU 95, a folding process execution program for controlling the transport motor Mf, the shift motor Ms, the stopper driving means 44, and the path switching means 63 so as to execute the folding specifications described above is stored in the ROM 96. Further, the RAM 98 stores data for calculating the sheet crease by the crease position calculation means 97 and the operation timing time of the shift motor Ms as data.

The fold position calculation means 97 calculates a fold position (dimension) from the leading end of the sheet (distal end in the paper discharge direction) from the “sheet length size”, “folding specification”, and “binding margin dimension”. It consists of For example, in the bi-fold mode, the sheet is folded at a half position in the paper discharge direction, or folded at a half position leaving a preset binding margin. The calculation of the crease position is calculated by, for example, [{(sheet length size) − (binding margin)} / 2].

In the tri-fold mode, the fold position is calculated according to the folding specifications such as letter fold (inner fold, 1 / 3Z fold), filing fold (1 / 4Z fold, 1 / 3Z fold).

[Folding operation]
The operation of the configuration of the sheet folding apparatus B will be described. FIG. 8A shows a state in which the sheet that has entered the carry-in entrance 30 is corrected, and FIG. 8B shows a state in which the sheet has been carried into the first switchback path 34 for primary folding. 9A shows a state in which the sheet is folded at the primary folding position Np1, FIG. 9B shows a state in which the folded sheet is carried into the second switchback path 35, and FIG. 10A shows a secondary folding position Np2. FIG. 5B shows a state where the sheets are folded together, and FIG. FIG. 11A is an operation state diagram showing a folding operation in the bi-fold mode, and FIG. 11B is a flowchart of the control operation.

In FIG. 8A, the sheet is guided to the carry-in entrance 30 and is sent downstream by a carry-in roller pair (first carrying means) 40. At this time, the control means 95a controls the stopper driving means 44 so that the gate stopper means 42 is located at the operating position (locking position) Ps. Then, the leading edge of the sheet is locked to the regulating surface 43s of the stopper member 43 and is bent and deformed in a loop shape within the registration area. At this time, the sheet is aligned at the leading edge along the regulating surface 43s.

Next, the control means 95a retracts the gate stopper means 42 from the operating position (locking position) Ps to the standby position Pw. With this retraction operation of the gate stopper means 42, the movement trajectory in which the regulating surface 43s retreats out of the path from the locking position Ps is set so as to pass in the vicinity of the pressure contact p1 of the second conveying means 41 on the downstream side. ing.
Accordingly, the leading end of the sheet is aligned at the restricting surface 43s at the locking position (operating position) Ps, and the sheet is guided to the pressure contact p1 while following the retracting operation of the restricting surface 43s while maintaining the aligned posture. .

In FIG. 8B, the control means 95a moves the gate stopper means 42 from the operating position (locking position) Ps to the standby position Pw. Then, the sheet is sent to the downstream side of the first path 32 by the second conveying means 41 rotating simultaneously with the rotation of the first conveying means 40. Then, the control means 95a controls the path switching means 63 so as to guide the seat from the first path 32 to the first switchback path 34 as shown.

Then, the sheet is carried into the first switchback path 34 by the second conveying means 41. In the first path 32, a first sheet sensor S1 is disposed on the downstream side of the second conveying means 41, and detects the leading edge of the sheet carried into the first switchback path 34.

In FIG. 9A, the control means 95a is based on the signal detected by the first sheet sensor S1 and the elevating member 53c of the primary folding deflection member 53 at the timing when the fold position of the sheet is transferred to a predetermined position. Is moved from the standby position to the operating position. Then, the sheet in the first path 32 is deformed into a V shape toward the first nip portion Np1. When the driven roller 53a attached to the elevating member 53c is brought into pressure contact with the peripheral surface of the second roll 49, the sheet leading end side is fed out in the opposite direction (rotating direction of the second roll).

On the other hand, the sheet trailing edge feeds the sheet toward the first nip portion Np1 by the conveying force of the second conveying means 41. At this time, the curved guide surface of the guide member 53b regulates the sheet along the peripheral surface of the roll so as to follow the peripheral surface of the first roll 41b.

Therefore, the sheet is fed to the primary folding position Np1 by the driven roller 53a at the leading end side and the second conveying means 41 at the trailing end side thereof toward the first nip portion Np1, and the raising / lowering timing of the raising / lowering member 53c is set to the crease position. It will be determined. Therefore, the control unit 95a performs experiments in advance on the speed at which the sheet is transferred by the second conveying unit 41 and the timing at which the driven roller 53a is moved from the standby position to the operating position (particularly the timing at which the roller contacts the peripheral surface of the second roll 49). Use to set the optimum value.

Since the curved guide surface of the guide member 53b guides the sheet along the peripheral surface of the opposing first roll 41b in synchronization with the movement of the driven roller 53a from the standby position to the operating position, the sheet fold position However, there is no fear of changing each time.

In FIG. 9B, a sheet that has been folded at the first nip portion Np1 at the 1/2 position (folded), the 1/3 position (trifold), and the 1/4 position (trifold) is the first nip. The conveyance force is applied at the part Np1 and the sheet is sent downstream. Therefore, the control means 95a places the elevating member 54c of the secondary folding deflecting member 54 in the operating position in the two-fold mode and in the standby position in the three-fold mode. The figure shows the control in the tri-fold mode. When folding in half, the elevating member 54c is positioned at the operating position, and the folded sheet is guided from the leading end to the second nip portion Np2 and sent to the carry-out port 31 on the downstream side.

Therefore, in the three-fold mode, the control means 95a positions the elevating member 54c of the secondary folding deflecting member 54 at the standby position as shown in FIG. 9B. Then, the sheet sent from the first nip portion Np1 is sent from the leading edge to the second switchback path 35. Then, the sheet sensor S2 detects the leading end (fold position) of the sheet.

In FIG. 10A, the control means 95a operates the elevating member 54c of the secondary folding deflecting member 54 from the standby position when the secondary folding position reaches the predetermined position based on the detection signal of the sheet sensor S2. Move to position. Then, the sheet in the second switchback path 35 is fed out in the opposite direction when the driven roller 54a comes into contact with the peripheral surface of the third roll 50.

As a result, the front end side of the sheet is driven by the driven roller 54a, and the rear end side is fed by the first nip portion Np1 in the opposite direction to guide the sheet to the second nip portion Np2.
In this case, the movement timing of the elevating / lowering member 54c from the standby position to the operating position is the same as in the case of the primary folding deflection member 53 described above, and the operation of the guide member 54b is also the same.

In FIG. 10B, the folded sheet sent to the secondary folding position (second nip portion) Np2 is reliably folded by the additional folding roller 64 pressed against the second roll 49, and the third path 36. Therefore, the control means 95a sends the folded sheet to the paper discharge path 37 or returns it to the first path 32 according to a preset sorting specification. The illustrated apparatus controls the path switching flapper 66 and guides it from the sheet discharge path 37 to the storage stacker 65 in the case of the three-fold or 1 / 3Z-fold of the letter fold specification that does not need to be bound by the post-processing apparatus C. .

Further, in the three-fold mode such as bi-folding or 1 / 4Z-folding that requires post-processing such as filing or bookbinding and binding processing, the paper is transferred from the third path 36 to the first path 32, and the post-processing device 31 is transferred from the carry-out port 31. Send to C.

[Folding operation in bi-fold mode]
In the above-described folding operation, in the mode in which the sheet is folded in half, as shown in FIG. Then, the control means 95a calculates the crease position by the crease position calculation means 97 (St01). Therefore, in the control unit 95a, in the bi-fold mode (St02), the sensor S1 detects the leading edge of the sheet (St03). The primary folding deflecting member 53 is moved from the standby position to the operating position (St05) after elapse of a sheet feeding time corresponding to the length of the sheet calculated by the crease position calculating means 97 from this detection signal (St04). This movement is controlled by the rotation of the shift motor Ms.

In the process in which the elevating member 53c of the primary folding deflecting member 53 moves to the operating position, the sheet in the first path 32 is distorted toward the first nip portion Np1 based on the fold position as described with reference to FIG. Is done. When the driven roller 53a of the primary folding deflecting member 53 comes into contact with the peripheral surface of the second roll 49, the sheet is drawn and inserted into the first nip portion Np1 from the fold position.

At this time, in the bi-fold mode, the control means 95a sets the secondary folding deflecting member 54 to the operating position after the estimated time when the sheet fold is inserted into the first nip portion Np1 with reference to the detection signal from the sensor S1 (St06). Move (St07). This estimated time is set to a time before the fold position of the sheet is inserted into the first nip portion Np1 and the leading end of the folded sheet reaches the guide member 54b. Therefore, the leading edge of the folded sheet is guided by the curved guide surface of the guide member 54b in the state of FIG.

At the same time, the driven roller 54a located at the operating position is rotated in the direction indicated by the arrow in FIG. 11A following the rotation of the third roll 50, so that the leading edge of the folded sheet deviates from the second nip portion Np2. Even if it is curled, it is reliably guided to the second nip portion Np2 by the rotation of the driven roller 54a and the third roll 50.

Therefore, the control means 95a carries out the folded sheet carried out from the second nip portion Np2 to the third path 36 to the first path 32 from the third path 36. Then, the control means 95a prepares for the subsequent sheet processing with the secondary folding deflecting member 54 positioned at the operating position (St08). The illustrated one has a relationship in which the primary folding deflecting member 53 is positioned at the standby position, and the secondary folding deflecting member 54 that moves in the opposite direction is positioned at the operating position. It is also possible to configure so that the secondary folding deflecting member 54 is moved to the standby position by the detection signal of the paper sensor S3.

[Folding operation in tri-fold mode]
In the mode in which the sheet is folded in three, as described with reference to FIGS. 8 to 10, the image forming apparatus A receives a mode instruction signal indicating whether or not to perform folding processing simultaneously with the paper discharge instruction signal. Then, the control means 95a calculates the crease position by the crease position calculation means 97 (St01). Therefore, in the control unit 95a, in the tri-fold mode (St09), the sensor S1 detects the leading edge of the sheet (St10).

The primary folding deflecting member 53 is moved from the standby position to the operating position after the passage of the sheet feeding time corresponding to the length of the sheet calculated by the fold position calculating means 97 from this detection signal (St11) (St12). This movement is controlled by the rotation of the shift motor Ms.

In the process in which the elevating member 53c of the primary folding deflecting member 53 moves to the operating position, the sheet in the first path 32 is distorted toward the first nip portion Np1 based on the fold position as described with reference to FIG. Is done. When the driven roller 53a of the primary folding deflecting member 53 comes into contact with the peripheral surface of the second roll 49, the sheet is drawn and inserted into the first nip portion Np1 from the fold position. At this time, the control means 95a waits for the second sensor S2 to detect the leading edge of the sheet (St13) in the tri-fold mode.

Based on the signal that the second sensor S2 detects the leading edge of the sheet, the control means 95a moves the secondary folding deflecting member 54 to the operating position after an estimated time that the secondary folding position of the sheet reaches the predetermined position (St14). (St15). This expected time is set by the calculated value of the crease position calculating means 97. Therefore, the sheet is inserted into the second nip portion Np2 with a conveying force applied from the driven roller 54a. The front end of the sheet is detected by the paper discharge sensor S3 and is carried out from the third path 36 to the first path 32 according to the folding specification, or is carried out from the paper discharge path 37 to the storage stacker 65.

In the present invention, when the post-processing mode in which the sheet folding process is not performed is set by the mode setting unit 92 described above, it goes without saying that the sheet carried into the first path 32 is directly sent to the carry-out port 31. .

[Output path configuration]
The folded sheet folded in half as described above is fed to the third path 36 from the pressure contacts of the second and third rolls 49 and 50. Then, it is further folded by the roller 64 that is in pressure contact with the second roller 49 and guided to the third path. The third path 36 joins the first path 32 as described above. Branching from the third path 36, a paper discharge path 37 is continuously provided via a path switching flapper 66, and this paper discharge path 37 guides the folded sheet to a storage stacker 65 disposed below the second path 33. To do. This paper discharge path is configured as described above with a curvature R3. Reference numeral 67 in the figure denotes a paper discharge roller disposed in the paper discharge path 37.

Therefore, sheets that are folded in letter specifications such as inner folds or 1 / 3Z folds that do not need to be transferred to the post-processing apparatus C are accommodated in the storage stacker 65 without being transferred to the carry-out port 31.

  Of the folded sheets sent to the third path 36, the sheet to be transferred to the post-processing apparatus C and to be post-processed is transferred toward the outlet 31 by the carry-out roller 62. In this case, the determination as to whether or not to perform post-processing is configured such that, for example, the post-processing conditions are set simultaneously with the image forming conditions on the control panel described above. Then, it is configured to be carried out to the storage stacker 65 or to be transferred to the post-processing apparatus C according to the set finishing conditions.

[Image forming apparatus]
The image forming apparatus A has the following configuration as shown in FIG. This apparatus sends a sheet from the sheet feeding unit 3 to the image forming unit 7, prints the sheet on the image forming unit 7, and then carries out the sheet from the main body discharge port 18. The sheet feeding unit 3 stores sheets of a plurality of sizes in sheet feeding cassettes 4 a and 4 b, and separates designated sheets one by one and feeds them to the image forming unit 7. The image forming unit 7 includes, for example, an electrostatic drum 8, a print head (laser light emitting device) 9 and a developing device 10 arranged around the electrostatic drum 8, a transfer charger 11, and a fixing device 12. An electrostatic latent image is formed by the light emitting device 9, toner is attached to the developing device 10, an image is transferred onto the sheet by the transfer charger 11, and heat fixing is performed by the fixing device 12.

  The sheets on which images are formed in this way are sequentially carried out from the main body discharge port 18. 13 is a circulation path. The sheet printed on the front surface side from the fixing device 12 is turned upside down via the main body switchback path 14 and then fed again to the image forming unit 7 to be printed on the back surface side of the sheet. This is the path for duplex printing. The sheet printed on both sides in this way is turned upside down by the main body switchback path 14 and then carried out from the main body discharge port 18.

  An image reading unit 20 shown in FIG. 1 scans an original sheet set on the platen 21 with a scan unit 22 and electrically reads it with a photoelectric conversion element (not shown). The image data is digitally processed by an image processing unit, for example, and then transferred to the data storage unit 16 to send an image signal to the laser emitter 9. Reference numeral 25 denotes a feeder device that feeds a document sheet stored in the stacker 26 to the platen 21.

  The image forming apparatus A having the above configuration is provided with a control unit (controller) (not shown), and image forming conditions such as sheet size designation, color / monochrome printing designation, print number designation, single-sided / double-sided printing designation, and enlargement from the control panel 15. -Printout conditions such as reduced print designation are set.

  On the other hand, in the image forming apparatus A, image data read by the scan unit 22 or image data transferred from an external network is accumulated in the data storage unit 16, and the image data is transferred from the data storage unit 16 to the buffer memory 17. The data signal is sequentially transferred from the buffer memory 17 to the print head 9.

  From the control panel 15, the post-processing conditions are also input and designated simultaneously with the image forming conditions. As the post-processing conditions, for example, “print-out mode”, “staple binding mode”, “sheet bundle folding mode”, or the like is selected. As the post-processing conditions, the folding specifications in the sheet folding apparatus B described above are set.

[Post-processing equipment]
As shown in FIG. 2, the post-processing device C has the following configuration. This apparatus includes a sheet receiving port 69, a sheet discharge stacker 70, and a post-processing path 71 in an apparatus housing 68. The sheet receiving port 69 is connected to the carry-out port 31 of the above-described sheet folding apparatus B, and is configured to receive a sheet from the first conveyance path 32 or the third conveyance path 36.

  The post-processing path 71 is configured to guide the sheet from the sheet receiving port 69 to the paper discharge stacker 70, and a processing tray 72 is provided in this path. Reference numeral 73 in the drawing denotes a paper discharge port for collecting sheets from the post-processing path 71 on a processing tray 72 arranged on the downstream side. A punch unit 74 is disposed in the post-processing path 71. A paper discharge roller 75 is disposed at the paper discharge port 73, and sheets from the sheet receiving port 69 are stacked on the processing tray 72.

  The processing tray 72 switches back the sheet from the post-processing path 71 (conveying direction reverse) and collects and aligns it on a rear end regulating member (not shown) provided on the tray. For this reason, a forward / reverse roller 75 for switching back the sheet from the sheet discharge port 73 is provided above the tray. Further, the processing tray 72 is connected to the paper discharge stacker 70, and the sheet from the paper discharge port 73 is supported by the paper discharge stacker 70 at the front end side and the processing tray 72 at the rear end side (bridge support).

  The processing tray 72 is provided with a stapler unit 77 for binding the sheet bundle positioned on the rear end regulating member. Reference numeral 78 shown in the figure denotes alignment means that aligns the sheets carried on the processing tray in the direction perpendicular to the conveyance direction. Reference numeral 79 denotes a paddle rotating body, which is drivably coupled to the rotation shaft of the paper discharge roller 75 so as to transfer the sheet from the paper discharge roller 75 toward the trailing edge regulating member.

  Reference numeral 80 in the drawing denotes sheet bundle carrying-out means, which transfers the sheet bundle bound together by the stapler unit 77 to the sheet discharge stacker 70 on the downstream side. For this reason, the illustrated sheet bundle carrying-out means 80 includes a lever member 81 whose base end is pivotally supported so as to be swingable, and a sheet end engaging member 82.

  The sheet end engaging member 82 is mounted on the processing tray so as to reciprocate in the paper discharge direction along the processing tray 72, and is connected to the lever member 81. In the drawing, Mm is a drive motor that swings the lever member 81. Although not shown, the paper discharge stacker 70 is provided with an elevator mechanism that moves up and down according to the amount of stacked sheets.

A Image forming apparatus B Sheet folding device (folding processing unit)
C Post-processing device Np1 First nip (primary folding position)
Np2 second nip (secondary folding position)

7 Image forming unit 18 Main body discharge port 20 Document reading unit 25 Feeder unit (document feeding device)
29 apparatus housing 30 carry-in port 31 carry-out port 32 1st conveyance path | route (1st path | route)
33 Second transport path (second path)
34 First switchback path 35 Second switchback path 36 Third transport path (third path)
37 Paper discharge path 40 Carry-in roller pair (first transport means)
41a Pinch roller 41b First roll 42 Gate stopper means 43 Stopper member 43s Restricting surface 48 Folding means 49 Second roll 50 Third roll

53 Primary folding deflection member 53a Followed roller 53b Guide member 54 Secondary folding deflection member 54a Followed roller 54b Guide member 62a Unloading roller 62x Support shaft 63 Path switching member (path switching means)
63a Front guide surface 63b Back guide surface 65 Storage stacker Cp1 1st intersection Cp2 2nd intersection
















Claims (14)

  1. A device that folds a sheet from a carry-in entrance and carries it out to a carry-out exit,
    A first conveyance path that guides the sheet from the carry-in entrance to the carry-out exit without folding the sheet;
    A second conveyance path for folding the sheet from the carry-in port;
    Folding processing means arranged at the folding position of the second transport path and folding the sheet from the carry-in entrance,
    The second transport path is arranged to intersect the first transport path,
    A path end for guiding the sheet of the second transport path to the folding position;
    The sheet folding apparatus is characterized in that the path end portion for guiding the folded sheet from the folding position to the downstream side is disposed in an area facing vertically or horizontally via the first conveying path.
  2. A path end that guides the sheet of the second transport path to the folding position,
    The sheet folding apparatus according to claim 1, wherein the sheet from the carry-in entrance is branched from the first carrying path and carried in, and the carrying direction of the sheet is reversed and carried out to the folding position.
  3. The first conveyance path is configured by a path arranged in a substantially horizontal direction for guiding a sheet from the carry-in entrance to the carry-out exit,
    The second transport path has a path end for guiding a sheet to the folding position above the first transport path, and a path end for guiding the folded sheet downstream from the folding position. The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is disposed below one conveyance path.
  4. The folding processing means includes
    A plurality of pairs of folding rolls pressed against each other to form a first nip portion for primary folding of the sheet and a second nip portion for secondary folding of the sheet;
    The second transport path is
    A first switchback path for guiding the leading edge of the sheet to insert a fold position of the sheet into the first nip portion;
    A second switchback path for guiding the leading edge of the folded sheet in order to insert the fold position of the sheet into the second nip portion;
    And consists of
    2. The sheet folding apparatus according to claim 1, wherein the first switchback path and the second switchback path are disposed in an area facing each other through the first transport path.
  5. A primary folding deflecting member for guiding a fold of the sheet to the first nip portion;
    A secondary folding deflecting member for guiding the sheet fold to the second nip portion;
    Is placed,
    Each of the primary folding deflecting member and the secondary folding deflecting member is provided with a driven roller that is pressed against and separated from the folding roll located downstream of the nip portion,
    5. The sheet folding apparatus according to claim 4, wherein the fold of the sheet is fed out to the nip portion by pressing the driven roller against the folding roll.
  6. The first transport path is configured by a substantially straight path,
    The sheet folding apparatus according to claim 4, wherein the second conveyance path is configured by a path in which the first switchback path and the second switchback path are curved in a substantially arc shape.
  7. The first switchback path and the second switchback path constituting the second transport path are arranged in an approximately S shape above and below the first transport path. The sheet folding apparatus according to 6.
  8. The sheet folding apparatus according to claim 6, wherein a path length of the first switchback path is configured to be longer than a path length of the second switchback path.
  9. The first switchback path and the second switchback path are substantially arc-shaped paths,
    The curvature of the first switchback path is configured to be larger than the curvature of the second switchback path so that the frictional resistance exerted on the passing sheet is reduced. The sheet folding apparatus according to claim 1.
  10. A discharge path for carrying out the folded sheet from the folding processing means in the second switchback path;
    A storage stacker for storing the folded sheets from the paper discharge path is arranged,
    5. The sheet folding apparatus according to claim 4, wherein the sheet discharge path is configured by a substantially arcuate path that curves in a direction opposite to the second switchback path.
  11. The paper discharge path is configured by a substantially arc-shaped path curved in the opposite direction to the second switchback path,
    The sheet folding apparatus according to claim 9, wherein a curvature of the sheet discharge path is smaller than a curvature of the second switchback path.
  12. The first transport path is configured by a substantially straight path that crosses the apparatus housing;
    The first switchback path is disposed above the first transport path, and the second switchback path is disposed below the first transport path;
    The sheet folding apparatus according to claim 2, wherein a storage stacker for storing the folded sheet is disposed below the second switchback path.
  13. 14. A post-processing unit is provided downstream from the carry-out port, and a post-processing unit for aligning and stacking sheets from the first conveyance path and the second conveyance path. The sheet folding apparatus according to any one of the above.
  14. An image forming apparatus for sequentially forming images on sheets;
    A sheet folding apparatus for folding sheets from the image forming apparatus;
    Consisting of
    The image forming system, wherein the sheet folding apparatus includes the configuration according to any one of claims 1 to 14.







JP2009250999A 2009-10-30 2009-10-30 Sheet folding apparatus and image forming system provided with the same Active JP5595009B2 (en)

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JP2009250999A JP5595009B2 (en) 2009-10-30 2009-10-30 Sheet folding apparatus and image forming system provided with the same
US12/926,144 US8585032B2 (en) 2009-10-30 2010-10-28 Sheet folding apparatus and image formation system provided with the apparatus
CN201010526481.1A CN102050358B (en) 2009-10-30 2010-10-29 Sheet folding apparatus and image formation system provided with the apparatus

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US10324409B2 (en) 2015-10-30 2019-06-18 Canon Finetech Nisca Inc. Apparatus for folding sheets, apparatus for processing sheets, apparatus for forming images and method of folding sheets

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000016692A (en) * 1998-06-30 2000-01-18 Toppan Forms Co Ltd Single piece paper folding device
JP2003089472A (en) * 2001-09-20 2003-03-25 Konica Corp Post-processing device and image forming system
JP4175642B2 (en) * 2004-02-18 2008-11-05 リコーエレメックス株式会社 Paper folding device
JP2009018494A (en) * 2007-07-11 2009-01-29 Nisca Corp Method and equipment for bookbinding, and image forming system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000016692A (en) * 1998-06-30 2000-01-18 Toppan Forms Co Ltd Single piece paper folding device
JP2003089472A (en) * 2001-09-20 2003-03-25 Konica Corp Post-processing device and image forming system
JP4175642B2 (en) * 2004-02-18 2008-11-05 リコーエレメックス株式会社 Paper folding device
JP2009018494A (en) * 2007-07-11 2009-01-29 Nisca Corp Method and equipment for bookbinding, and image forming system

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