JP2001179694A - Correcting method for perforated sheet material and sheet material perforating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct an uneven state such as a bulge occurring in a sheet material in association with perforation for eliminating difficulties in a subsequent process of the sheet material. SOLUTION: In this correcting method for a perforated sheet material, after the perforation of the sheet material, a periphery of a perforated part of the sheet material is pressurized by sandwiching it from the front and back of the sheet material for flattening the periphery of the perforated part. In this sheet material perforating apparatus, a perforating apparatus main body and, in a downstream side of a conveyance line of the perforating apparatus main body, correcting devices pressurizing by sandwiching the periphery of the perforated part from the front and back of the sheet material for flattening the periphery of the perforated part are arranged along the conveyance line of the sheet material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for flattening and correcting a periphery of a hole such as a binding hole for filing a sheet material such as copied paper, and flattening a perforated portion used for these perforations. It belongs to the technical field of a rotary type or other sheet material punching device having a straightening device.

[0002]

2. Description of the Related Art Conventionally, a binding hole for filing a sheet material such as a copied sheet is punched by manually punching a sheet or the like by hand. A device for mechanically punching a plurality of binding holes with a sheet material punching device (hereinafter also referred to as a punch unit) incorporated therein has come to be used. As such a punch unit, a reciprocating punch unit that inserts the tip of a linearly moving punch into a die hole and pierces the hole (for example, Japanese Utility Model Laid-Open No. 5-29700, Japanese Unexamined Patent Application Publication No. 10-180693).
And a rotary punch unit (e.g., Japanese Utility Model Application Laid-Open No. 63-1) that synchronizes the rotation of a pair of rotating shafts having a punch and a die fixed thereto and engages the punch with the die hole to form a hole.
54199, JP-A-6-79697, JP-A-7-136992, JP-A-10-249797
And Japanese Patent Application No. 11-150291.

Japanese Patent Application Laid-Open No. 60-16399 discloses a rotary punch unit for punching a rotating hollow punch by pressing it against the surface of an elastic anvil roller. Since these rotary punch units have an advantage that the punching operation is easy for the punching while moving the perforated sheet material, the rotary punching unit is widely used in office machines such as copiers. .

However, in the conventional rotary punch unit described in Japanese Utility Model Application Laid-Open No. 63-154199, a punch and a die are rotated from FIG. Since the cutting edge is inserted into the die hole of the die 71 and the hole is punched, the perforated sheet material is pierced by the punch blade at the cutting start portion (advanced side) at the time of punching.
There is a problem that burrs and burrs are easily generated in the perforated holes. In order to solve this problem, many inventions relating to the shapes of punches and dies have been disclosed (for example, Japanese Utility Model Application Laid-Open No. 63-15419).
9, JP-A-6-79697, JP-A-7-1
36992, Japanese Unexamined Patent Publication No. 10-249797), and the structure becomes complicated.

In these rotary punch units, the punch axis and the die axis must be accurately and synchronously rotated. For this purpose, gears for synchronously rotating the punch shaft and the die shaft are provided with means for eliminating backlash and the like, and it is necessary to set and assemble the punch so that the punch is accurately fitted into the die hole. Particularly, in a punch unit having a plurality of punch pairs, there is a problem that it takes a lot of man-hours to precisely assemble and adjust the positions of the plurality of punches and dies. On the other hand, Japanese Unexamined Patent Publication No.
The rotary punch unit described in Japanese Patent Application Laid-Open No. 9-1990 for punching a hole by pressing the tip of a rotating hollow punch against the surface of an elastic anvil roller has the advantage that it is not necessary to precisely assemble the positions of a punch and a die. And the roller shafts are connected by gears and are rotated synchronously. Therefore, the elastic roller is liable to be worn, the sharpness is reduced early, and the life of the punch unit is shortened.

In order to solve the above-mentioned problem, the present inventors have developed a rotary punch unit for pressing a punch having a ring-shaped cutting edge such as a hollow punch into an elastic anvil roller so that punching can be performed smoothly and neatly. As a rotary punch unit with high use durability and reduced cost, the shaft on which the hollow punch is mounted is driven for rotation, and the anvil roller having elasticity is rotated asynchronously with respect to the drive shaft such as idle rotation. This was proposed in Japanese Patent Application No. 11-044543, in which the surface position of the anvil roller in contact with the tip of the punch was randomly changed, and as a result, the entire circumference of the anvil roller was used for perforation.

[0007]

However, the inventors of the present invention disclose the above-mentioned proposed rotary punch unit which rotates the anvil roller asynchronously, such as idle rotation, and the above-mentioned Japanese Patent Application Laid-Open No. 60-16399 which rotates the anvil roller synchronously. Also in the rotary punch unit described above, it has been found that in the perforated sheet material, the perforated portion rises from the sheet surface, and the raised portion hinders the subsequent processing of the sheet material. Therefore, the present invention provides a method and a sheet material punching device with a straightening device for correcting a non-flat state such as a swelling generated in the sheet material due to perforation by flattening, thereby obstructing the subsequent processing of the sheet material. The task is to provide.

[0008]

According to the present invention, as described above,
It is based on the fact that a non-flat state such as swelling occurs in the sheet material with the perforation, and that this non-flat state hinders the subsequent processing of the sheet material. A method for correcting the perforated sheet material by flattening and correcting the periphery of the perforated portion by pinching the periphery of the perforated portion from the front and back of the sheet material. A punching device body for punching a hole and a straightening device for flattening the periphery of the punching portion by pinching the periphery of the punching portion of the sheet material from the front and back of the sheet material with a pinch roll on the downstream side of the transport line of the punching device body are arranged. This is a sheet material punching device.

According to the method for correcting a perforated sheet material of the present invention, a non-flat state such as a swelling generated in the sheet material due to perforation is caused by pressing the periphery of the perforated portion of the sheet material from the front and back directions of the sheet material. By doing so, the flattening is corrected, and the subsequent processing of the sheet material is not hindered. The sheet material to be corrected in the present invention may be flattened and corrected a plurality of sheets at a time. However, from the viewpoint of the reliability of the correction, it is desirable to squeeze each sheet. This is because, for example, when the holes of a plurality of sheets are displaced, a portion that is not sufficiently pressed may be formed, and the correction may be insufficient.

Further, the sheet punching device of the present invention is provided with a straightening device using a pinch roll as a straightening method at the rear of the punching device main body. Although the pinch roll has a simple structure, the pinch roll has a strong clamping force, and therefore has a strong correcting action.In general, a conveying roller for the sheet material is provided before and after the sheet material punching device. It is also possible to use the same as the transport roller. As a typical sheet material punching device of the present invention, the punching device main body is composed of an anvil roller having elasticity proposed in the above two examples, and a punch that presses a ring-shaped cutting blade at the tip to the roller through the punching sheet material. Rotary punch unit. The rotary punch unit of this type can perform flying perforation and can easily adjust a punch and an anvil roller.
The three proposals have major features such as long life,
This is because this is the only defect that causes a non-flat state.

However, the non-flat state generated in the sheet material due to the perforation is not necessarily caused only by the use of the elastic anvil roller as in the above two examples. For example, a well-known screw punch having a fixed die and a ring-shaped cutting edge at the tip, a threaded portion at an outer diameter behind the same, and a hollow punch utilizing the thrust of the male screw, a large number of sheets. And a punch having an edge surrounding the die hole and a punch having a tapered surface fitted to the edge, as described in Japanese Patent Application Laid-Open No. 11-33996 by the present applicant. In the case of a unit or a rotary punch unit in which a punch and a die are engaged with each other, as shown in A, B, C, D, and E of FIG. When providing a groove such as a V-shape on the outer peripheral surface instead of a surface,
Furthermore, it also occurs in the case of drilling in various other types. Therefore, the present invention should not be limited by the cause of the non-flat state.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, since a conveying roller for a sheet material is usually provided before and after (an entrance side) of the sheet material punching device, the straightening device in the sheet material punching device of the present invention is used. The pinch roll pair may be configured such that at least one of the upper and lower axes is a common rotation drive axis, and one of the correction pinch rolls alone or one of the transport roller pairs is provided on this axis to also serve as the transport roller. I can do it. In the pinch roll of the present invention, both are generally made of a hard material such as metal or plastic, but the influence of assembly errors on the pressing force is reduced, and the friction coefficient is increased with emphasis on the purpose of transportation. One or both may be made of a flexible material such as rubber or urethane. In addition, the pinch roll presses only the necessary width portion around the perforation hole,
Generally, the width is narrow, but the width is not limited to this.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the embodiment shown in FIG. FIG.
Is a diagram for explaining an embodiment of the present invention, wherein A is a top view, B is a front view (a view taken in the direction of the arrow XX in C), C is a cross-sectional view, and p is a perforated sheet material. In each of the drawings, the punching device 1 includes a punching device main body 2, a pair of transport rollers 4 at the entrance thereof, and a straightening device (pair of pinch rolls and transport rollers for straightening) 5 at the exit. The punching apparatus main body 2 has a frame 20 formed by connecting both end portions of frame members 21 and 22 bent into a groove-shaped cross section by side plates 23 and 24.

A punch shaft 25 has a shaft end gear 26 and, in this embodiment, three hollow punches 27 fixed at predetermined positions.
An axial position is fixed by a side plate 23 of the frame 20 and a bearing fixed to a bent portion 28 formed on a web portion of the frame member 22 so as to be rotatably supported, and a U-shaped tip of a plastic support 29 is provided. The drilling reaction force is supported by the groove. The hollow punch 27 has a ring-shaped cutting blade at the tip and a punch dust discharge port at the body, and has a rear end face fixed to the punch shaft 25 at right angles. The punch does not need to be hollow as long as it discharges drilling debris from the tip. The three elastic anvil rollers 30 are rotatably supported at fixed axial positions on pins 31 fixedly supported on bent portions 32 formed on the web portion of the frame member 21.

Conveying roller pair 4 at the entrance of punching device main body 2
And the outlet straightening device 5 have shafts 41, 42 and 51, 52, respectively, of which the shafts 41, 42 are
The shaft is rotatably supported by bearings attached to the shafts 3, 24, and one shaft is driven to rotate by a gear at the shaft end. On the other hand, axes 51 and 5
Numeral 2 is rotatably supported by a bearing attached to the side plate 23 and brackets projecting from the frame members 21 and 22, respectively, and one shaft is driven to rotate by a gear at the shaft end.
Further, these shafts 41, 42 and 51, 52 are fixed with a urethane transport roll 40 and a hard rubber straightening pinch roll and transport roll 50, respectively. The pinch roll / conveyance roll 50 is installed at a position downstream of the pair of the anvil roller 30 and the hollow punch 27.

After being processed by the image processing device, the sheet material p which is cut into a predetermined length by the cutting device or a fixed-size sheet is detected at its leading edge by a sensor (not shown) in a conveying process. By means of a motor (not shown), the punch shaft 25, the conveying roller pair 4 and the exit straightening device 5 start rotating, and the sheet material p is conveyed. During the conveyance, the punch 27 cooperates with the anvil roller 30 and A hole is drilled at a certain position from the trailing edge of the material p. Perforated sheet material p
During the perforation, since the anvil roller is deformed by its elasticity and the pressing force of the punch, the perforated portion is deformed so as to rise from the sheet surface. The sheet material p having the swell is conveyed as it is by the rolls including the conveyance rolls 4, and the swell portion is flattened by being pinched by the pair of straightening pinch rolls and conveyance rollers 5 of the straightening device at the exit. .

The anvil roller 30 has a punch 27
Since it is asynchronous rotation with respect to and it rotates appropriately after the drilling, its entire circumferential surface participates in the drilling at almost equal frequency, so that only a specific part does not particularly wear and damage, Beautiful perforation is possible by maintaining sharpness for a long time.

In this embodiment, the punching device main body, the straightening device, and the pair of entrance conveying rollers are integrally integrated to share a frame, and the punching shaft is used as the main body of the punching device. The support 33 makes the stiffness high by supporting the drilling reaction force, and the anvil rollers are rotatably supported on the pins 31 fixedly supported by the bent and raised portions formed in the frame, thereby increasing the rigidity and increasing the pin height. The shafts 51 and 52 are used as straightening devices to prevent the elongation of
Since it is supported by brackets protruding from the frame members 21 and 22, a large clamping force is realized with a small-diameter shaft to obtain a high flattening correction effect. However, the present invention is not limited to the above embodiment, but can be freely changed within the scope of the claims.

[0019]

According to the present invention, it is possible to eliminate an obstacle in the subsequent processing of the sheet material by correcting a non-flat state such as a bulge generated in the sheet material due to the perforation. As described above, the invention proposed in Japanese Patent Application No. 11-044543 solves the problem that it is not necessary to assemble the positions of the punch and the die precisely, and the abrasion of the elastic roller is prevented and the sharpness is reduced early. However, there is only one problem with the unevenness of the sheet material after perforation. If the method of the present invention is used in combination with the above proposed invention,
This only problem can be solved by a simple measure of arranging a straightening device that also serves as a transport roll. However, the non-flat state of the sheet material due to the perforation is not limited to the perforation proposed above, but also occurs in other sheet material perforating apparatuses. Therefore, the present invention can be applied to all of them.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of the present invention.

FIG. 2 is a diagram illustrating a punching mechanism of a conventional rotary punch unit that meshes a punch and a die.

FIG. 3 is a diagram illustrating an example of occurrence of a non-flat state due to perforation.

[Explanation of symbols]

1: punching device, 2: punching device main body, 20: frame, 2
1, 22: frame member, 23, 24: side plate, 25: punch shaft, 26: gear, 27: hollow punch, 28: bent up portion, 29: support, 30: anvil roller, 3
1: pin, 32: bending section, 4: entrance transport roller pair, 40: transport roll, 41, 42: shaft, 5: straightening device, 50: straightening pinch roll and transport roll, 51, 52
Shaft 61: punch, 71: die, p: sheet material to be perforated

Claims (4)

[Claims] 1. A method for correcting a perforated sheet material, wherein after perforating the sheet material, the periphery of the perforated portion is flattened by pressing the periphery of the perforated portion from the front and back of the sheet material. 2. The flattening correction is performed one sheet at a time.
Of perforated sheet material. 3. A perforating device main body that perforates the sheet material along a sheet material conveying line, and the periphery of the perforated portion of the sheet material on the downstream side of the conveying line of the perforating device main body. A flattening device for flattening and correcting the periphery of the perforated portion by pinching with a pinch roll. 4. The sheet material perforating device according to claim 3, wherein the perforating device main body comprises an anvil roller having elasticity and a punch for pressing a ring-shaped cutting edge at the tip against the anvil roller via the perforated sheet material. apparatus.