JPH079393A - Paper sheet post-treatment device - Google Patents

Abstract

PURPOSE:To provide a paper sheet post-treatment device equipped with a paper sheet punching means which can surely punch holes in a copying paper sheet in parallel with the end face of the copying paper sheet by a force of a small drive section even when a plurality of holes are punched out in a thick copying paper sheet. CONSTITUTION:This device is a paper sheet post-treatment device which distributes copying paper sheets delivered out of an image forming means into bins arranged in multiple stages. The device is equipped with a plurality of punches 701 which are installed on a rotating shaft while being slipped by a specified angle with respect to the rotating direction, and with a die 702 which is provided while being faced to each punch 701, and punches out the copying paper sheet by allowing each punch 701 to be fitted in each hole section 702a during a process of rotation. The device is also equipped with a paper sheet punching means 70 which inclines the respective rotating shafts 703b and 703b of the punch 701 and the die 702 to the direction that the dislocation in the rotating direction of each punch 701 is corrected in such a way as to be parallel with the end face of each copying paper sheet in the delivery direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet post-processing apparatus such as a copying machine or a facsimile, and more particularly to a rotary sheet punching apparatus for the sheet post-processing apparatus.

[0002]

2. Description of the Related Art In a conventional sheet punching apparatus, a method in which a punch punches by linearly reciprocating a fixed die and a method in which a punch and a die rotate to punch a hole are known. There is. In a paper punching device that punches by punching by rotating the punch and the die, when the positions of the blades of the punch and the die are arranged on the same straight line, a plurality of holes are simultaneously punched in the copy paper, At the same time, the load is applied to the drive unit due to the thickness of the copy paper, and when the paper having a large paper thickness is punched, a considerably large force is required for the drive unit. Further, even when the number of punches and dies is increased and the number of holes opened in the copy sheet is increased, the driving unit also needs a large force. In each of the above cases, in order to obtain a sheet punching device capable of punching reliably with a small driving force, conventionally, the positions of a plurality of punches and the blades of the dies are displaced by a certain angle in the rotation direction, and the time for punching holes is increased. A method has been considered in which a difference is provided to reduce the load on the drive unit.

[0003]

However, in the above-mentioned conventional method, the positions of the plurality of holes formed in the copy paper are parallel to the end face in the paper discharge direction by providing the holes at different times. The problem that does not occur occurs. SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet post-processing apparatus capable of surely making a hole in parallel with an end face of a copy sheet with a small driving force even when making a plurality of holes on a thick copy sheet. To do.

[0004]

SUMMARY OF THE INVENTION The above-described object is to provide a sheet post-processing apparatus having a sheet punching device for distributing copy sheets discharged from an image forming apparatus onto a multi-stage array of bins and punching the sheets. In the paper punching device, a plurality of punches mounted on the rotary shaft at a predetermined angle in the rotation direction are provided, and the punches are provided so as to face the punches, and the punches are fitted into the holes during the rotation process. And a plurality of dies that are punched in each of the punches, and the rotation axes of the punches and the dies are inclined in a direction that corrects the shift in the rotation direction of the punches in parallel with the end face of the copy sheet in the discharge direction. It

[0005]

In the above means, when punching a plurality of holes in the copy sheet, the positions of the punches and the blades of the dies are shifted so as to shift the time for punching, and the punches and the dies are fixed. Since the rotating shaft that is installed is inclined with respect to the copy paper transport direction, multiple holes cannot be opened at one time, so the load on the drive unit is small, and the drive unit with low power is sufficient. The deviation of the clear time is corrected by the inclination of the rotary shafts of the punch and the die, so that a plurality of holes can be surely formed in the position parallel to the end surface of the copy sheet.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view of a sheet post-processing apparatus according to an embodiment, FIG. 2 is an enlarged front view of a main portion of the same, FIG. 3 is a perspective view of a sheet punching apparatus, and FIGS. (C) is an explanatory view showing an operation process of the punch and the die of the paper punching device, FIG. 5 is a side view of the punch and the die of the paper punching device, and FIG. 6 is a front view of the punch and the die portion showing inclination of the punch in the rotating direction. FIG. 7 and FIG. 7 are side views of the punch portion showing the inclination of the rotation axis.

First, the schematic structure of the sheet post-processing apparatus will be described. In these figures, 1 is an image forming apparatus, 2 is
Is a sheet post-processing device, and 3 is a paper discharge roller on the image forming apparatus 1 side. Further, inside the sheet post-processing device 2, the switching claw 5, the transport roller 6, the sheet punching device 70, the transport roller 6, the discharge roller 7, and the bins vertically arranged in multiple stages in order from the upstream side in the sheet transport direction. 8 are arranged. An inlet sensor 4 is provided near the upstream side of the switching claw 5, as shown in FIG. Further, the sheet punching device 70 includes a plurality of punches 701 and a plurality of dies 702 with the sheet conveying surface S interposed therebetween.
Are arranged to face each other. Each die 702 has a hole portion 702a and a taper guide portion 702b which is continuous with the hole portion 702a and whose one side surface side is wide. As shown in FIGS. 2 and 5, the taper guide portion 702b is positioned directly below the hole portion 702a. The scrap residue 714 is securely guided to the scrap residue storage box 715. 703a and 703b are rotation axes of the die 702 and the punch 701, 704 is a home sensor, 706 is a drive motor, 707 is a transmission pulley, and 70
8 is a timing belt, 709a and 709b are gears, 71
1 is a drive pulley, 712 is a detection plate, 716 is a stay, 7
Reference numeral 18 is a full sensor.

Next, the operation will be described. Image forming apparatus 1
The copy paper ejected from the paper ejection roller 3 is conveyed to the paper post-processing device 2. The copy sheet conveyed to the sheet post-processing device 2 passes through the entrance sensor 4, is conveyed to the distribution section by the switching claw 5, and is conveyed to the sheet punching device 70 by the conveying roller 6. Copy paper is a paper punching device 70
When a trailing edge of the copy sheet passes through the entrance sensor 4 and a certain period of time elapses, the driving motor 706 for punching operates and the driving pulley 71 attached to the driving motor 706.
1 rotates, and the transmission pulley 707 rotates via the timing belt 708. The rotation of the transmission pulley 707 depends on the rotation of the gear 70.
9a, 709b, and the rotation of the gears 709a, 709b is transmitted to rotating shafts 703a, 703b that are integral with the gears 709a, 709b, and is attached to the rotating shaft 703a. The punch 701 thus rotated rotates in the direction of the arrow in FIG. For the copy sheet, the punch 701 and the die 7 of the sheet punching device 70 are used.
When the punch 701 and the die 702 rotate (see FIG. 4A) and the hole 702a of the die 702 and the punch 701 are engaged (see FIG. 4B), the punch 701 is punched. After a certain period of time after the copy sheet passes through the entrance sensor 4, the punch 701 and the die 702 are rotationally engaged with each other, so that the copy sheet can be punched at a predetermined position. Further, the time from when the copy sheet passes through the entrance sensor 4 to when the punch 701 and the die 702 start to rotate can be set arbitrarily, and thereby, the punching can be performed at an arbitrary position of the copy sheet. Is possible. The copy sheet punched by the sheet punching device 70 is transported to the discharge roller 7 by the transport roller 6,
It is discharged to the bottle 8. The punch 701 and the die 702 that have finished punching the copy sheet further rotate (see FIG. 4).
(See (c)), the detection plate 71 attached to the gear 709b.
When the home sensor 704 detects the second cutout portion 713, both of them stop at a predetermined position.

The above series of operations is performed for each copy sheet discharged from the image forming apparatus 1. Immediately after the punching punch 701 and the punch dies 702 punches out the copy sheet, the scraps 714 drop into the hole 702a of the die 702 and reach the taper guide portion 702b on the inner surface of the die 702. 702b
Then, it falls from the inside of the die 702 to the inside of the punched waste storage box 715 provided in the lower portion. When the punching operation is continued by the sheet punching device 70, and the scraps 714 drop into the scraps storage box 715 and accumulate a certain amount, a stay 716 provided for fixing the scraps storage box 715 is provided.
The full-state detection sensor 718 attached to the sensor detects this, and notifies the fullness of the scrap 714 by an LED (not shown). Further, the punched waste storage box 715 is detachable from the sheet post-processing apparatus 2, and when the fullness detection sensor 718 detects that the punched waste 714 is full, it is pulled out from the sheet post-processing apparatus 2 to process the punched waste 714. It is possible.

Next, the characteristic part of the present invention will be described. As shown in FIGS. 6 and 7, a plurality of (three in this embodiment) punches 701, 701, 7 are provided on the rotary shaft 703b.
01 is a constant angle in the axial direction and a constant angle θ in the direction perpendicular to the center line of the rotary shaft 703b (2.5 in this embodiment).
°) It is fixed at the shifted position. On the other hand, a plurality of punches 701 and the same number of dies 702 are fixed to the rotary shaft 703a at positions where they mesh with the blade portions of the punch 701 (the peripheral edge portion of the tip of the punch 701). By the way, if the punching is performed as it is, the punching operation is performed in order from the punch 701 and the die 702 near the driving motor 706 during the punching operation. However, the punching positions of the copying sheet are different from the driving motor 706 side. Causes misalignment in the copy paper ejection direction. In order to correct this deviation, in this embodiment, the rotary shaft 70 to which each punch 701 is fixed is fixed.
3b and a rotating shaft 703a to which the die 702 is fixed.
As shown in FIG. 7, the drive motor 706 is attached so as to be inclined so that the side of the drive motor 706 precedes in the copy sheet carry-in direction (inclined by 0.4 ° in this embodiment). As a result, the position of each hole in the punched copy sheet is on a straight line parallel to the trailing edge of the sheet.

In the above-described embodiment, the copy sheet discharged from the image forming apparatus is distributed on the bins 8 arranged in multiple stages, and the sheet post-processing apparatus is provided with the sheet punching device 70 for punching the sheet. In the paper punching device 70, a plurality of punches 701 mounted on a rotating shaft at a predetermined angle in the rotation direction are provided, and the punches 701 are provided in opposition to the punches 701. The punches 701 fit into the holes 702a during the rotation process. And a plurality of dies 702 for punching a sheet by using the punch 70.
Since the rotary shafts 703a and 703b of the die 1 and the die 702 are tilted in a direction that corrects the misalignment in the rotational direction of the punches 701 in parallel with the end face of the copy sheet in the discharge direction, when opening a plurality of holes in the copy sheet, Punch 701 and dice 70
The positions of the two blades are shifted to shift the time for punching, and the rotary shafts 703a and 703b, which fix the punches 701 and the dies 702, are provided to be inclined with respect to the copy sheet conveyance direction. Therefore, the load applied to the drive unit can be reduced, and the plurality of holes can be surely formed in the position parallel to the end surface of the copy sheet with the drive unit of low power.

[0012]

As described above, according to the present invention,
When punching multiple holes on copy paper, the positions of the punch and die blades are shifted to shift the time for punching holes.
Also, since the rotary shafts that fix the punches and dies are inclined with respect to the copy paper transport direction, the load on the drive unit is small, and the drive unit with low power can be used for the end face of the copy paper. It is possible to surely make a plurality of holes in parallel positions.

[Brief description of drawings]

FIG. 1 is a schematic front view of a sheet post-processing apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is an enlarged front view of a main part of the sheet post-processing apparatus according to the embodiment of the present invention.

FIG. 3 is a perspective view of a sheet punching device of the sheet post-processing apparatus according to the embodiment of the present invention.

FIG. 4 is an explanatory view showing an operation process of a punch and a die of a sheet punching device.

FIG. 5 is a side view of a punch and a die of the sheet punching device.

FIG. 6 is a front view of the punch and the die portion showing the inclination of the punch in the rotation direction.

FIG. 7 is a side view of a punch portion showing an inclination of a rotation axis.

[Explanation of Codes] 1 Image forming device 4 Entrance sensor 5 Switching claw 6 Conveying roller 8 Bin 70 Paper punching device 701 Punch 702 Dice 702a Holes 703a and 703b Axes (rotating shafts) 706 Drive motor 715 Extraction waste box 718 Full detection Sensor (detection means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Ichikawa 2-28-24 Izumi, Higashi-ku, Nagoya, Aichi Prefecture, Yokota Building Ricoh Elemex Co., Ltd. (72) Inventor Yuji Ueno 2-28 Izumi, Higashi-ku, Nagoya-shi, Aichi Prefecture 24 Within Yokota Building Ricoh Elemex Co., Ltd.

Claims (1)

[Claims] 1. A sheet post-processing apparatus comprising a sheet punching device for distributing copy sheets discharged from an image forming apparatus onto bins arranged in multiple stages and punching the sheets, wherein the sheet punching device comprises: A plurality of punches that are attached to the rotating shaft by being shifted by a predetermined angle in the rotation direction, and a plurality of dies that are provided so as to face each punch and that punches into a sheet by fitting the punches into the holes during the rotation process. A sheet post-processing apparatus, characterized in that the rotary axes of the punch and the die are inclined in a direction that corrects a shift in the rotational direction of the punch in parallel with the end face of the copy sheet in the discharge direction.