JPH09168995A - Transfer paper cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively retreat the rear end of transfer paper after cutting from a rotary cutting edge by providing a plate member freely protruded into and retreated from a conveying path so as to separate the rear end of the transfer paper after cutting from the rotary cutting edge, downstream of the rotary cutting edge. SOLUTION: A guide plate 24 protruded into a transfer paper conveying path by a driving means is provided downstream of a rotary cutting edge 21 and on the same side viewing from the conveying path. The guide plate 24 is protruded into the transfer paper conveying path immediately after cutting transfer paper P by the rotary cutting edge 21 and a fixed cutting edge 22. Then the rear end P' of the transfer paper P is positively separated from the tip of the rotary cutting edge 21 by the moved guide plate 24. The rear end P' of the transfer paper P after cutting can thus be retreated from the rotary cutting edge 21 without influencing cutting performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper cutting device applied to an image forming apparatus using a roll-shaped transfer paper.

[0002]

2. Description of the Related Art Conventionally, there are mainly two types of transfer sheet cutting mechanisms for an image forming apparatus using a roll-shaped transfer sheet, one of which is a type in which the transfer sheet is stopped when it is cut (the transfer sheet is transferred only when the transfer is stopped. Including type to make slack on paper), other 1
One is a type that cuts the transfer paper without stopping the conveyance by a blade that rotates in synchronization with the conveyance of the transfer paper, and the latter is the mainstream for high-speed machines and long-length compatible machines. In the type using a rotary blade, a structure in which the blade is inclined is generally adopted as a means for allowing the trailing end of the transfer paper after cutting to escape from the rotary blade.

[0003]

As the copying speed increases, the rotation speed of the rotary blade during cutting of the transfer paper also increases, making it difficult for the trailing edge of the transfer paper to escape after cutting and the inclination of the rotary blade also affecting cutting performance. There are limits when considering the impact.

12 to 14 are cutting process diagrams of a transfer paper for explaining a conventional problem. As shown in FIG. 12, the transfer blade P is cut to an arbitrary length by engaging the fixed blade 22 pressed by the spring 23 and the rotary blade 21 whose rotation is controlled by a motor (not shown).

Then, as shown in FIG. 13, the transfer sheet P after cutting is conveyed to the downstream side by the conveying roller pair 16 and further by the conveying rollers on the downstream side thereof. When the escape from 21 is incomplete, the transfer paper P is folded or torn as shown in FIG. 14, and when the toner image on the photoconductor is transferred to the transfer paper, the adhesion between the photoconductor and the transfer paper is incomplete. Therefore, there is a problem in that a missing image occurs.

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a transfer paper cutting device capable of reliably retracting the trailing end of the transfer paper after cutting from the rotary blade.

[0007]

In order to achieve the above object, the first aspect of the present invention uses a cutter unit composed of a fixed blade and a rotary blade to cut a transfer sheet drawn from a transfer sheet roll while being conveyed. The transfer paper cutting device is characterized in that it is provided with a plate-like member that is retractable in the transport path and that separates the rear end of the cut transfer paper from the rotary blade on the downstream side of the rotary blade.

A second aspect of the present invention is a transfer paper cutting device that uses a cutter unit composed of a fixed blade and a rotary blade to cut the transfer paper drawn from a transfer paper roll while conveying the transfer paper. It is characterized in that it is provided with a blowing means for separating the rear end of the cut transfer paper from the rotary blade.

A third aspect of the present invention is a transfer paper cutting device which uses a cutter unit composed of a fixed blade and a rotary blade to cut the transfer paper drawn from a transfer paper roll while conveying the transfer paper, on the downstream side of the rotary blade. It is characterized in that a suction means for separating the rear end of the cut transfer paper from the rotary blade is provided.

A fourth aspect of the present invention is a transfer paper cutting device that uses a cutter unit consisting of a fixed blade and a rotary blade to cut the transfer paper drawn from a transfer paper roll while conveying the transfer paper, downstream of the rotary blade. It is characterized in that it is provided with an electrostatic attraction means for separating the rear end of the cut transfer paper from the rotary blade.

A fifth aspect of the present invention is a transfer paper cutting apparatus which uses a cutter unit composed of a fixed blade and a rotary blade to cut while transferring a transfer paper drawn from a transfer paper roll. It is characterized in that it is provided with a plate-like member having an elastic free end for separating the rear end of the transfer paper from the rotary blade.

A sixth aspect of the present invention is a transfer paper cutting apparatus which uses a cutter unit composed of a fixed blade and a rotary blade to cut the transfer paper drawn from a transfer paper roll while conveying the transfer paper. An elastic member for separating the rear end of the transfer sheet from the rotary blade is provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a plate member, a blowing means, a suction means, an electrostatic attraction means or other forced separating means is provided on the downstream side of a rotary blade, or a rotary blade has an elastic free end. A plate-shaped member, an elastic member, or other forced separating means is provided to forcibly separate the rear end of the cut transfer paper from the rotary blade.

A detailed description will be given below. FIG. 1 is a schematic configuration diagram of an image forming apparatus to which the present invention is applied. This image forming apparatus has four transfer paper rolls 1, 2, 3, 3 in a paper feeding section.
4, the transfer paper P is pulled out from one of the selected transfer paper rolls and is conveyed.

The transfer sheet cut to an arbitrary length by the cutter unit 11 is conveyed to the photosensitive drum 13 by the conveying roller pair 16 and the conveying roller pair on the downstream side thereof. The toner image formed on the surface of the photoconductor drum 13 by the developing device 12 is transferred onto the transfer paper by the transfer device 14, and the transfer paper having the toner image fixed by the fixing device 15 is ejected to the outside of the machine.

2 and 3 are configuration diagrams showing a transfer paper cutting step according to the first specific example. In the first specific example, the guide plate 2 that protrudes to the transfer sheet conveyance path by the driving means (not shown) on the downstream side of the rotary blade 21 and on the same side as seen from the conveyance path.
4 are provided. Then, as shown in FIG. 3, the rotary blade 2
Immediately after the transfer sheet P is cut by 1 and the fixed blade 22, the guide plate 24 is projected to the transfer sheet transport path. Then, the trailing edge P ′ of the transfer paper is moved to the rotary blade 21 by the moved guide plate 24.
Be sure to separate from the blade edge of.

FIG. 4 is a constitutional view showing how the trailing end of the cut transfer paper is separated in the second specific example. In the second specific example, the blowing nozzle 25 is provided on the downstream side of the rotary blade 21 and on the same side as seen from the transport path. After cutting the transfer paper P, the rear end P ′ of the transfer paper P can be separated from the rotary blade 21 by blowing air from a blower (not shown) to the rear end P ′ of the transfer paper P through the blowing nozzle 25.

FIG. 5 is a constitutional view showing how the trailing end of the cut transfer sheet is separated from each other in the third specific example. In the third specific example, the suction nozzle 26 is provided on the downstream side of the rotary blade 21 and on the opposite side from the transport path. The trailing edge P ′ of the transfer paper is forcibly sucked in a direction away from the rotary blade 21.

FIG. 6 is a constitutional view showing how the trailing end of the cut transfer paper is separated in the fourth specific example. In the fourth specific example, an electrostatic adsorption device 27 is provided instead of the suction nozzle 26 of the third specific example. The function and effect are the same as those of the third specific example. Further, the guide plate 2 on the downstream side of the electrostatic adsorption device 27
A neutralizing brush 29 for neutralizing the charged transfer paper rear end P ′ is provided at 8.

FIG. 7, FIG. 8, FIG. 9, and FIG. 10 are configuration diagrams showing a transfer paper cutting step according to the fifth specific example. In the fifth specific example, a mylar 30 having a tip as a free end and slightly protruding to the outside of the rotary blade 21 is attached to the rotary blade 21. At the time of cutting, as shown in FIG. 8, the free end of the mylar 30 presses the transfer paper P outwardly, and thereby it is bent. Therefore, after the transfer paper P is cut, the rear end P ′ of the transfer paper is separated from the rotary blade 21 by the restoring force of the mylar 30, as shown in FIGS.

FIG. 11 is a block diagram showing a sixth specific example. In the fifth specific example, the free end of the elastic plate-shaped member (mylar 30) separates the transfer paper rear end P ′ from the rotary blade, but in the sixth specific example, the plate-shaped member is used instead. A soft resin member 31, which also has elasticity, is provided on the rotary blade 21. The action and effect are the same as in the fifth example.

[0022]

According to the first aspect of the present invention, since the movable plate-like member is provided on the downstream side of the rotary blade, the trailing edge of the transfer paper can be rotated without affecting the cutting performance. Can be dismissed from the blade.

According to the second aspect of the invention, since the air blower is provided on the downstream side of the rotary blade, the same effect as the above can be obtained.

According to the invention described in claim 3, since the suction means is provided on the downstream side of the rotary blade, the same effect as the above can be obtained.

According to the invention described in claim 4, since the electrostatic attraction means is provided on the downstream side of the rotary blade, the same effect as described above can be obtained.

According to the invention described in claim 5, since the rotary blade is provided with the plate-like member having the elastic free end, the same effect as described above can be obtained.

According to the invention described in claim 6, since the elastic member is provided on the rotary blade, the same effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus to which the present invention is applied.

FIG. 2 is a configuration diagram showing a transfer paper cutting step according to a first specific example.

FIG. 3 is a configuration diagram showing a transfer paper cutting step according to a first specific example.

FIG. 4 is a configuration diagram showing how the trailing edge of the cut transfer paper is separated from each other in a second specific example.

FIG. 5 is a configuration diagram showing how the trailing edge of the cut transfer paper is separated in a third specific example.

FIG. 6 is a configuration diagram showing how the trailing end of cut transfer paper is separated in a fourth specific example.

FIG. 7 is a configuration diagram showing a transfer paper cutting step according to a fifth specific example.

FIG. 8 is a configuration diagram showing a transfer paper cutting step according to a fifth specific example.

FIG. 9 is a configuration diagram showing a transfer paper cutting step according to a fifth specific example.

FIG. 10 is a configuration diagram showing a transfer paper cutting step according to a fifth specific example.

FIG. 11 is a configuration diagram showing a sixth specific example.

FIG. 12 is a configuration diagram showing a transfer paper cutting process for explaining a defect of a conventional example.

FIG. 13 is a configuration diagram showing a transfer paper cutting process for explaining a defect of a conventional example.

FIG. 14 is a configuration diagram showing a transfer paper cutting process for explaining a defect of a conventional example.

[Explanation of symbols]

 21 rotary blade 22 fixed blade 24 plate-like member 25 blowing nozzle 26 suction nozzle 27 electrostatic adsorption device 30 mylar 31 soft resin member

Claims (6)

[Claims] 1. A transfer paper cutting device, which uses a cutter unit including a fixed blade and a rotary blade to cut a transfer paper drawn from a transfer paper roll while conveying the transfer paper, wherein a transfer after cutting is provided downstream of the rotary blade. A transfer paper cutting device, comprising a plate-like member that is retractable in a conveyance path and separates a rear end of the paper from the rotary blade. 2. A transfer paper cutting device, which uses a cutter unit composed of a fixed blade and a rotary blade to cut a transfer paper drawn from a transfer paper roll while conveying the transfer paper, wherein a transfer after cutting is provided downstream of the rotary blade. A transfer paper cutting device, comprising: a blowing unit that separates the trailing edge of the paper from the rotary blade. 3. A transfer paper cutting device, which uses a cutter unit composed of a fixed blade and a rotary blade and cuts a transfer paper drawn from a transfer paper roll while conveying the transfer paper. A transfer paper cutting device comprising a suction means for separating the rear end of the paper from the rotary blade. 4. A transfer paper cutting device, which uses a cutter unit composed of a fixed blade and a rotary blade and cuts a transfer paper drawn from a transfer paper roll while conveying the transfer paper. A transfer paper cutting device comprising an electrostatic attraction means for separating the rear end of the paper from the rotary blade. 5. A transfer paper cutting device for cutting a transfer paper drawn from a transfer paper roll while being conveyed by using a cutter unit including a fixed blade and a rotary blade, wherein: A transfer paper cutting device comprising a plate-like member having an elastic free end for separating the end from the rotary blade. 6. A transfer paper cutting device for cutting a transfer paper drawn from a transfer paper roll while conveying the transfer paper, using a cutter unit composed of a fixed blade and a rotary blade, wherein: A transfer paper cutting device comprising an elastic member for separating an end from the rotary blade.