JPH07136994A - Paper sheet after-treatment device - Google Patents

Abstract

PURPOSE:To provide a paper sheet after-treatment device having a rotary punching unit suppressing the flapping and curling of a paper sheet in a sheet carrier path at a punched hole boring part to the paper sheet so as to prevent the damage of the punched hole part of the paper sheet. CONSTITUTION:A flange like protruding part 36 with a diameter larger than the outer diameter of the blade part 31a of a punch 31 is formed behind the blade part 31a, and the offset of the punched hole part of a paper sheet P onto the shank side of the punch 31 is impeded by this protruding part 36. A rib protruding toward the inside of a paper sheet guide path is formed at one guide plate at least in the vicinity of the punch 31 and a die 32, and the spacing of the paper sheet guide path is narrowed so that the paper sheet P is pressed to the die 32 side.

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 which is installed in an image forming apparatus such as a copying machine or a printing machine and which punches or sorts discharged sheets. .

[0002]

2. Description of the Related Art Conventionally, in some copying machines, printers, etc., a stapling device for binding a plurality of sheets discharged from an image forming apparatus and a sheet punching device (punch unit) for punching holes in the sheets. A sheet post-processing device having a sheet is used. A type of conventional paper post-processing device that has a paper punching mechanism that punches punching holes for filing by rotating the punch and the die in opposition to each other and inserting the blade of the punch into the hole of the die. There is known a sheet post-processing apparatus including a punch unit (rotary punch unit).

[0003]

By the way, as described above, in the rotary punch unit for punching holes in the sheet being conveyed by rotating the punch and the die in synchronization with the sheet conveying speed, the curled state of the conveyed sheet is The perforated portion of the paper may be torn by fluttering or flapping.

Such a phenomenon is caused, for example, by the blade portion 31a at the tip of the rotating punch 31 as shown in FIG.
Immediately after punching holes in the
The punch hole portion of the sheet P is biased toward the shaft portion side of the punch 31 due to flapping, curling of the sheet P, or the like.
Since the punch 31 tries to come out of the sheet P in this state, the punch hole portion of the sheet P is caught at the portion A of the punch 31 at that time. If this phenomenon is mild, the paper P may be flipped up, but if it is severe, the punched hole portion of the paper P will be torn.

The present invention has been made in view of the above points, and an object of the present invention is to punch a sheet by suppressing flapping and curling of the sheet in a sheet guide path at a punch hole punching portion for the sheet. It is an object of the present invention to provide a sheet post-processing device equipped with a rotary punch unit capable of preventing breakage of hole portions.

[0006]

In order to solve the above-mentioned problems, according to the present invention, in claim 1, a punch and a die of a rotary punch unit are opposed to a sheet discharged from an image forming apparatus such as a copying machine. In the sheet post-processing device having a sheet punching mechanism for punching filing punch holes by inserting the blade portion at the tip of the punch into the hole of the die, the blade is placed behind the blade portion of the punch. A flange-shaped convex portion having a diameter larger than the outer diameter of the portion is formed.

According to the second aspect of the present invention, the punch and the die of the rotary punch unit are rotated so as to face the sheet discharged from the image forming apparatus such as a copying machine, and the blade portion at the tip of the punch is inserted into the hole of the die. By doing so, in the sheet post-processing apparatus having the sheet punching mechanism for punching punch holes for filing, the interval between the sheet guide paths for punching holes in the sheet with the punch and the die is set to be different from that of other sheet transport paths. The structure is formed to be narrower than the interval.

[0008]

According to the present invention, in claim 1, since the flange-shaped convex portion having a diameter larger than the outer diameter of the blade portion is formed behind the blade portion of the punch, it is possible to apply the same to the sheet. The deviation of the punched hole portion of the sheet toward the punch shaft portion is prevented by the convex portion when punching the punched hole.

According to the second aspect of the invention, the interval between the paper guide paths at the portion where the punch and the die are used to punch holes in the paper is narrower than the intervals between the other paper transport paths. Flapping and curling of the paper in the paper guide path at the perforated portion are suppressed by the paper guide spacing in the paper guide path.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 4 and 5, the paper P ejected from the image forming apparatus 1 such as a copying machine by the paper ejection roller 11.
Passes through the entrance guide plate 4 of the sheet post-processing device 2 and the branching claw 12, and is conveyed by the sheet conveying roller 17 to the sheet conveying path 1.
3 and is conveyed to the rotary punch unit 30 provided in the sheet conveying path 13.

Thereafter, as shown in FIG. 5, when the trailing edge of the paper P is detected by the entrance sensor 19, a drive motor (not shown) is activated after a certain period of time to rotate the rotary shafts 33, 34.
Rotate in the directions of the arrows in FIG. These rotary shafts 33, 34 are arranged in parallel with each other in the rotary punch unit 30 across the paper transport path 13, and each rotary shaft 33, 34 has a plurality of punches 31 and a die 32. Are fixed so as to face each other.

When the rotary shafts 33 and 34 rotate, as shown in FIG. 6, the punch 31 and the die 32 rotate, and the blade portion 31a of the tip surface of the punch 31 sandwiches the paper P and the hole portion of the die 32. The sheet P is punched at a predetermined position on the sheet P.

As shown in FIG. 5, the punch residue 40 generated by the punching of the punch holes is dropped into a residue container box 39 having an opening at the upper part thereof which is detachably held by a residue receiver holder below the die 32. Be recovered. As shown in FIG. 5, the punch scraps 40 collected in the scrap storage box 39 are piled up in a mountain shape with the falling position as the top, and when the punch scraps 40 reach a certain amount or more,
The full state detection sensor 41 provided in the waste receiving holder detects the full state of the punch waste 40, and a message indicating that the punch waste 40 collected in the waste storage box 39 is full is displayed outside the apparatus.

As shown in FIG. 4, the sheet P having punched holes is moved to a predetermined bin 2 by each sheet conveying roller 17.
0 is ejected. Paper P discharged onto this bin 20
After the discharging operation is completed, the staple unit 5
0 is stapled (stapled).

In this embodiment, a stepping motor is used as the drive motor to facilitate the position / speed control.

By the way, as described above, in the rotary punch unit which punches holes in the sheet being conveyed by rotating the punch and the die in synchronism with the sheet conveying speed,
The perforated portion of the sheet may be broken due to the curled state of the conveyed sheet or the flap, and such a phenomenon may occur, for example, at the blade portion 31a at the tip of the rotating punch 31, as shown in FIG. Immediately after punching holes in P, the punched portions of the paper P are offset between the guide plates 35 due to the flapping of the paper P, the curling of the paper P, and the like. Punch 31 in this state
The punch 3 in order to get out of the paper P,
This occurs when the punch hole portion of the sheet P is caught in the portion A of 1.

Therefore, in the sheet post-processing apparatus of the present invention, as shown in FIG. 1, behind the blade portion 31a of the punch 31, a flange-shaped convex portion 36 having a diameter larger than the outer diameter of the blade portion 31a. To form. As a result, as shown in FIG. 1, when the punch hole is punched in the sheet P, a deviation of the punch hole portion of the sheet P toward the shaft portion side of the punch 31 is formed behind the punch blade portion 31a. It is blocked by the convex portion 36. Therefore, according to this configuration, the sheet P conveyed between the guide plates 35 does not go too far to the shaft portion side of the punch 31 when the punch 31 punches the punch holes, and the punch 31 keeps the sheet P. When trying to get out of
The punch hole of the sheet P is caught on the shaft of the punch 31,
The sheet P will not be turned over or torn.

FIGS. 2 and 3 show another embodiment of the present invention. In this embodiment, the punch 31 and the die 32 are used to set the distance between the paper guide paths at the portion where the punch holes are punched in the paper P. It is configured to be formed to be narrower than the interval of the paper transport path. Specifically, at least one guide plate 35 in the vicinity of the punch 31 and the die 32 is provided with a rib 37 formed so as to narrow the space between the paper guide paths by protruding toward the paper guide path. . As a result, the interval between the paper guide paths at the portion where the punch 31 and the die 32 punch holes in the paper P is narrower than the interval between other paper transport paths.
As shown in FIG. 3, the rib 37 of the guide plate 35 regulates the conveyance path of the sheet P so that the sheet P is pressed toward the die 32 side. Therefore, in the sheet guide path at the punched portion of the punch hole. The flapping and curling of the paper is suppressed. Therefore, according to this configuration, the paper P conveyed between the guide plates 35 is similar to the above-described embodiment.
When the punch 31 punches a punch hole, the punch 31 does not overshoot the shaft portion side of the punch 31, and when the punch 31 tries to come out of the paper P, the punch hole of the paper P is punched by the punch 31. The sheet is not caught and the sheet P is not turned over or torn.

[0019]

As described above, according to the first aspect of the present invention.
According to, according to the flange-shaped convex portion having a diameter larger than the outer diameter of the blade portion formed behind the blade portion of the punch,
When punching a punch hole in a sheet, it is possible to prevent the punch hole portion of the sheet from deviating toward the shaft portion side of the punch, so that the sheet does not catch on the punch when punching the punch hole, and the sheet P is turned up You can punch holes without tearing.

According to the second aspect of the present invention, the interval between the paper guide paths at the portion where the punch holes are punched in the paper by the punch and the die is narrower than the interval between the other paper transport paths. Flapping and curling of the paper in the paper guide path at the punching portion of the hole can be suppressed, the paper does not get caught in the punch when punching the punch hole, and a punch hole that does not curl or tear the paper P is opened. You can

[Brief description of drawings]

FIG. 1 is a sectional view for explaining a sheet punching operation of a punch and a die of a rotary punch unit in an example of a sheet post-processing apparatus of the present invention.

FIG. 2 is a side view for explaining a sheet punching operation of a punch and a die of a rotary punch unit in another example of the sheet post-processing apparatus of the present invention.

FIG. 3 is a cross-sectional view for explaining a punching operation of a punch and a die of a rotary punch unit in another embodiment of the sheet post-processing apparatus of the present invention.

FIG. 4 is a schematic configuration diagram of a sheet post-processing apparatus in which the present invention is implemented.

FIG. 5 is a cross-sectional view showing a configuration of a rotary punch unit of the sheet post-processing apparatus according to the present invention.

FIG. 6 is a cross-sectional view for explaining the punching operation of the punch and the die of the rotary punch unit of the above-described embodiment of the rotary punch unit of the sheet post-processing apparatus according to the present invention.

[Explanation of symbols]

 2 Paper Post-Processing Device 4 Entrance Guide Plate 12 Branching Claw 13 Paper Conveying Path 17 Paper Conveying Roller 19 Entrance Sensor 20 Bin 30 Rotary Punch Unit 31 Punch 31a Punch Blade 32 Die 32a Die Hole 33, 34 Rotating Shaft 35 Guide Plate 36 Punch convex portion 37 Guide plate rib 39 Waste container box 40 Punch waste 41 Full detection sensor P Paper

Front page continuation (72) Inventor Mitsuru Ichikawa 28-2-24 Izumi, Higashi-ku, Nagoya, Aichi Prefecture, Ricoh Elemex Co., Ltd. (72) Inventor Tetsuji Watanabe 2-28-24 Izumi, Higashi-ku, Nagoya, Aichi Prefecture Ricoh Elemex Co., Ltd.

Claims (2)

[Claims] 1. Filing is performed by rotating a punch and a die of a rotary punch unit so as to face a sheet discharged from an image forming apparatus such as a copying machine, and inserting a blade portion of a tip of the punch into a hole of the die. In a sheet post-processing apparatus having a sheet punching mechanism for punching holes for punching, a flange-shaped convex portion having a diameter larger than the outer diameter of the blade portion is formed behind the blade portion of the punch. Paper post-processing device. 2. A filing is performed by rotating a punch and a die of a rotary punch unit so as to face a sheet discharged from an image forming apparatus such as a copying machine, and inserting a blade portion of a tip of the punch into a hole of the die. In a sheet post-processing apparatus having a sheet punching mechanism for punching punch holes for punching, the interval between the sheet guide paths for punching holes in the sheet with the punch and the die is made narrower than the intervals between other sheet transport paths. A paper post-processing device characterized by the above.