JPH1135217A - Paper boring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper boring device capable of being made small in size, and light in weight. SOLUTION: This paper boring device is provided with a pressing cam 1, a pressing plate 2 to be pressed by the pressing cam 1, a punch 4 integrally provided for the pressing plate 2, a punch guide member 6, and a positioning member 12 formed integrally with the punch guiding member 6, and with a die 9 having a hole 9a to be engaged with the positioning member 12, and a hole 9b to be engaged with the punch 4, and the like. When the pressing plate 2 is pressed down with the pressing cam 1 rotated, the positioning member 12 is engaged with the hole 9a of the die 9, so that the punch 4 is thereby positioned to the die 9 (its hole 9b).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet punching device for forming a punched hole in a sheet discharged from an image forming apparatus such as a copying machine, a printer or the like. The present invention relates to a sheet punching device provided with a die.

[0002]

2. Description of the Related Art Various image forming apparatuses having a punching device for forming a punch hole for a file on a sheet after image formation have been proposed. This punching device is mainly composed of a plurality of punches and dies arranged above and below the sheet transport path in the width direction of the sheet. And
The punching device is arranged near the upstream of the discharge roller of the image forming apparatus main body in the sheet transport direction.

Japanese Unexamined Patent Publication No. Hei 4-305000 proposes a perforation apparatus that can be easily attached without largely changing the configuration of the image forming apparatus main body. The punching device disclosed in the above publication includes a case detachably attachable to a sheet discharge unit of an image forming apparatus main body, and a punch and a die disposed in the case and for forming a punch hole in a sheet. I have. Further, the punch and the die are fixed to the rotating frame so that their positions do not relatively change.

[0004]

The above-mentioned punching device comprising a bunch and a die is fixed to a rigid support member integrally formed in order to maintain a relative positional relationship between the punch and the die. I have. As a result, the size of the drilling device increases,
This has led to an increase in weight. In addition, since the support member is integrally formed, when a paper jam occurs, the perforated portion cannot be opened, and there is a problem that it is difficult to remove the jammed paper.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet punching apparatus which can solve the above-mentioned problems of the conventional apparatus and can reduce the size and weight.

[0006]

According to a first aspect of the present invention, there is provided a paper sheet having a punch and a die for forming a punched hole in a sheet in a conveying path of an image-formed sheet. Prior to the punching operation of the punch, the punching device is provided with position regulating means for regulating the relative position of the punch and the die.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a punch guide member for guiding a punching operation of the punch, a positioning member provided on the punch guide member, and a positioning member provided on the die. A positioning hole for fitting is provided.

According to a third aspect of the present invention, in the second aspect of the present invention, the positioning member is arranged at a position where the positioning member does not interfere with the sheet at the time of punching.

According to a fourth aspect of the present invention, in the second aspect, one or both of the punch guide member and the die are movably provided.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the supporting member for supporting the punch guide member and the supporting member for supporting the die are formed as a sheet transport guide plate.
At least one of the paper transport guide plates is openable and closable.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a sheet punching device according to an embodiment of the present invention, and FIG. 2 is a front view of the same. Here, the plane perpendicular to the paper transport direction is defined as a side surface, and the paper transport direction surface is defined as a front surface. The paper punching device includes a pressing cam 1, a pressing plate 2 pressed by the pressing cam 1, a punch 4 provided integrally with the pressing plate 2, a punch guide member 6, and a punch guide member 6. And a die 9 having a hole 9a in which the positioning member 12 fits and a hole 9b in which the punch 4 fits, and the like. When the pressing plate 2 is pressed down by the rotation of the pressing cam 1, the positioning member 12 is fitted into the hole 9 a of the die 9, thereby positioning the punch 4 and the die 9 (hole 9 b). It has become.

The details will be described below. The recording paper 10
In FIG. 1, the sheet is conveyed from right to left. The transported recording paper 10 is further transported by a transport roller pair 11 on the downstream side of the punching device. When the recording sheet 10 is conveyed by a predetermined amount, the conveyance driving unit (not shown) stops, and the recording sheet 10 stops in a state where a portion to be punched is in the punching device.

When the recording paper 10 stops, the pressure cam 1 is driven by cam driving means (not shown). Pressing cam 1
The pressing plate 2 is pressed down by the action of. A punch 4 is provided integrally with the pressing plate 2, and is pressed down integrally with the pressing plate 2.

The pressing plate 2 has a pressing plate guide member 13.
Are provided, and the pressure plate guide member 13
Are fitted to the pressure plate 2. The compression spring 3 is disposed coaxially with the pressure plate guide member 13, and when the pressure plate 2 is pressed down, the punch guide member 6 is pressed down via the compression spring 3.

The punch guide member 6 is vertically movably supported by a guide support member 15 provided integrally with the guide plate 7. On the lower surface of the punch guide member 6, a positioning member 12 is provided integrally, and the positioning member 1 is provided.
Numeral 2 is arranged further upstream than the upstream end of the stopped recording paper 10. As the punch guide member 6 is pressed, the positioning member 12 is fitted into the hole 9a of the die 9 into which the positioning member 12 fits.

The position of the hole 9b of the die 9 in which the punch 4 is fitted and the hole of the punch guide member 6 in which the punch 4 is fitted are aligned by the operation of the positioning member 12, and the operation is performed. , The punch 4 and the hole 9b into which the punch 4 provided on the die 9 is fitted are aligned.

The die 9 is provided integrally with the guide plate 8, and is supported by a die support member 16 so as to be freely left and right. When the pressing plate 2 is further pressed down, the punch guide member 6 stops at a certain distance from the die 9 by the action of the step provided on the positioning member 12. The punch 4 pierces the recording paper 10 and fits into a hole 9 b for punch fitting provided in the die 9.

When the pressure cam 1 further rotates, the action of the compression spring 14 and the compression spring 5 pushes up the punch guide member 6, the punch 4, and the pressing plate 2. Pressing cam 1
Is rotated once, cam driving means (not shown) is stopped,
The perforation operation ends. After the punching operation is completed, the transport drive unit (not shown) is driven, and the recording paper 10 is transported by the action of the transport roller pair 11.

As described above, according to the embodiment of the present invention, when the pressing plate 2 is pressed down by the pressing cam 1, the positioning member 12 provided integrally on the lower surface of the punch guide member 6.
Is first fitted into the hole 9a of the die 9, and at this time, the punch 4 and the hole 9b of the die 9 are aligned. And
Thereafter, the punch 4 pierces the recording paper 10 and fits into the hole 9 b provided in the die 9. Therefore, punch 4 and die 9
Can always be kept constant.

[0021]

According to the first aspect of the present invention, prior to the punching operation of the punch, the relative position between the punch and the die is regulated, so that the punch and the die can be firmly integrated with the support member. Since there is no need to fix, miniaturization of the device,
Lightening can be achieved.

According to the second aspect of the present invention, there is provided a punch guide member for guiding a punching operation of a punch, a positioning member is provided on the punch guide member, and a positioning hole for fitting the positioning member is provided on the die. As a result, the above-described effect is achieved.

According to the third aspect of the present invention, by arranging the positioning member at a position where it does not interfere with the sheet at the time of punching, it becomes possible to perform punching during sheet transport.

According to the fourth aspect of the present invention, since one or both of the punch guide member and the die are provided so as to be movable, maintenance when the punch or the die is defective becomes easy.

According to the fifth aspect of the present invention, the supporting member for supporting the punch guide member and the supporting member for supporting the die are formed as a sheet conveying guide plate, and at least one of the sheet conveying guide plates can be freely opened and closed. In addition, the ability to remove paper when a paper jam occurs is improved.

[Brief description of the drawings]

FIG. 1 is a side view of a sheet punching device according to an embodiment of the present invention.

FIG. 2 is a front view of the same.

[Explanation of symbols]

 Reference Signs List 1 pressure cam 2 pressure plate 3 compression spring 4 punch 5 compression spring 6 punch guide member 7, 8 guide plate 9 die 9a positioning member fitting hole 9b punch fitting hole 10 recording paper 11 transport roller pair 12 positioning member 13 pressure plate Guide member 14 Compression spring 15 Guide support member 16 Die support member

Claims (5)

[Claims] 1. A sheet punching device provided with a punch and a die for forming a punched hole in a sheet on a conveyance path of an image-formed sheet, wherein a relative position between the punch and the die is regulated prior to a punching operation of the punch. A sheet punching device, comprising a position regulating means for performing the operation. 2. The device according to claim 1, further comprising a punch guide member for guiding a punching operation of the punch, a positioning member provided on the punch guide member, and a positioning hole for fitting the positioning member on the die. A sheet punching device characterized by the above-mentioned. 3. The sheet punching device according to claim 2, wherein the positioning member is arranged at a position that does not interfere with the sheet when punching. 4. The sheet punching device according to claim 2, wherein one or both of the punch guide member and the die are movably provided. 5. The paper transport guide plate according to claim 4, wherein the support member for supporting the punch guide member and the support member for supporting the die are formed as a paper transport guide plate, and at least one of the paper transport guide plates is freely opened and closed. Paper punch.