JPH05169395A - Sheet cutter - Google Patents

Abstract

PURPOSE:To prevent a paper jam from occurring in a way of reducing the number of clearances, where a paper tip is liable to enter, ascribable to the paper jam, by using a stationary knife edge material and a guide in combination. CONSTITUTION:Since a guide is formed in the state a plane 14 of a sheetlike cutter material 11 is installed in parallel with a pass line of paper, and an edge 13 of the cutter material 11 is installed so as to cane very nearer to a platen roller 3, a tip of the paper will in no case penetrate into a clearance between the platen roller 3 and the guide, passing the paper on the guide. The paper run past on the guide being composed of the plane 14 of the sheet cutter material 11 passes through a clearance between a cutting edge 12 of a stationary knife 1 and a cutting edge 21 of a movable knife 2, and after the specified length of it run past, this movable knife 2 operates, thus the paper is cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material cutting device which is installed in office equipment such as a facsimile or a printer and is mainly used for cutting paper.

[0002]

2. Description of the Related Art Paper (hereinafter also simply referred to as paper), which is a sheet material processed by an office machine such as a facsimile or a printer, is often wound in a roll shape, but the paper is fed out and fed to a platen roller. Even after passing, the curl will remain,
This curling causes the leading end of the paper to be caught in the apparatus and causes a paper jam, so various guides are provided to reliably feed the paper to the cutting position. As one of the methods, in a facsimile, a guide may be provided in advance at a position close to the platen roller, and a cutting device may be brought close to the guide and installed inside.

In the sheet material cutting device, a cutting device is often used in which a guide is attached and a guide is provided for surely passing a sheet from the platen roller to the cutting position. On the other hand, the sheet material cutting device has a large shear angle so that thick paper can be cut with a small driving force, thereby reducing the size,
There is also a demand for a low-priced cutting device, and the applicant of the present application, in Japanese Utility Model Laid-Open No. 62-72094, inscribes a blade edge locus circle of a rotating or swinging movable blade with a blade edge of a fixed blade to drive a driving force. Disclosed is a cutting device capable of reducing the noise.

[0004]

As described above, the method of providing the guide between the platen roller and the cutting position of the sheet is most frequently used. In the cutting apparatus having such a structure, the guide and the sheet cutting apparatus are used. Another problem may occur due to the positional relationship with. That is, a normal sheet cutting device often has a structure including a movable blade that rotates or swings and a fixed blade whose blade edge is pressed against the movable blade, but the guide smoothly inserts paper into the cutting device. Therefore, it is necessary to install the movable blade or the fixed blade as close to the fixed blade as possible. However, if the guide and the movable blade or the fixed blade are too close to each other, the guide and the movable blade or the fixed blade interfere with each other, increasing the load at the time of cutting, making it impossible to cut or making an abnormal sound. Therefore, it is necessary to provide a certain amount of clearance between the guide and the movable blade or the fixed blade. However, if a gap is provided between the guide and the movable blade or fixed blade, paper may enter the gap, so to prevent this, the guide surface should be slightly higher than the cutting edge. However, there is also the complexity that it is necessary to experimentally obtain an appropriate positional relationship based on the paper passing angle, curl state, guide shape, etc. to determine the amount of step. Also, if the amount of the step between the blade edge of the fixed blade or the rotary blade and the guide surface is too large, the paper will be pushed down at the time of cutting due to the step and a crease will be generated, or it will be pushed down for a long time. After cutting and after cutting, the tip of the paper may enter the locus circle of the blade edge of the rotary blade, and when the rotary blade returns, the tip of the paper may be lifted and the tip may be creased.

On the other hand, the inventor of the present application has found that the above-mentioned actual exploitation 62
In the cutting device disclosed in No. 72094, a paper guide is not provided, so it was tried to attach a paper guide, but there is no room to attach the guide because the side plate supports the rotary blade and the movable blade. It has been found. Therefore,
The present invention improves the cutting device disclosed in Japanese Utility Model Laid-Open No. 62-72094 so that it can guide a paper, and also eliminates various problems that must be taken into consideration when attaching the guide as described above. Moreover, it is an object of the present invention to provide a cutting device capable of reliably passing the leading end of the paper from the platen roller onto the guide.

[0006]

As a result of various studies to solve the above problems, the inventor of the present application has a structure in which the fixed blade also serves as a guide, and thereby the cutting position between the platen roller and the sheet is improved. The present invention has been completed by finding that various problems occurring between the two can be solved. Then, in order to obtain the above-described structure that also serves as the fixed blade and the guide, it has been found that a structure in which a thin blade material is joined to a base metal formed by bending a sheet metal is required. However, using a thin blade material for the fixed blade,
A sheet material cutting device having a structure in which a fixed blade and a guide are used in common is often used in a type in which a blade edge of a fixed blade is circumscribed on a blade edge circle of a movable blade. For example, it is disclosed in FIG. 1 of Japanese Utility Model Application Laid-Open No. 62-117097. Even with such a cutting device, it is possible to extend the blade metal material to the opposite side of the rotary blade to form a guide, but such a structure tends to increase the area occupied by the cutting device.

Therefore, the present invention has been completed as a structure in which the fixed blade of the cutting blade of which the blade edge of the fixed blade, which is easy to occupy a small area, is inscribed in the trailing edge circle of the movable blade also serves as the guide. .. That is, according to the present invention, a movable blade whose both ends are rotatably or swingably supported, and one end of a thin plate-shaped tool material forms a cutting edge of a fixed blade, and the other end is close to a platen roller. It is a cutting device consisting of a fixed blade. Furthermore, the plane of the thin plate-shaped tool material that forms the fixed blade is mounted substantially parallel to the path line of the sheet material, and the blade edge of the fixed blade is installed at a position inscribed in the blade edge locus circle of the movable blade,
The sheet material cutting device is characterized in that the flat surface of the fixed blade guides the sheet material.

[0008]

According to the present invention, after the rolled paper is fed out and passed through the platen roller, the leading end of the paper can be reliably passed on the guide. The guide is mounted so that the flat surface of the blade material is parallel to the path line of the paper, and the edge of the blade material is mounted so as to be very close to the platen roller. Paper can be passed over the guide without entering the gap between the guide and the guide. The paper that has passed over the guide composed of the flat surface of the thin blade material passes through the gap between the fixed blade edge and the movable blade edge, and after the paper has passed the specified length, the movable blade is activated and cut. It Since the guide and fixed blade are integrally formed, there is no gap between the fixed blade and guide and there is no step as in the past, so the paper can be securely passed between the fixed blade and the movable blade. I can make paper.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments and drawings. FIG. 1 is a perspective view showing an embodiment of a sheet material cutting device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a perspective view showing a situation during cutting. First, the fixed blade base metal 15 is formed by bending a cold-rolled steel plate that has been plated.
Was produced. After bending the longitudinal direction of the sheet metal into an L-shape to form the fixed blade base metal side surface 16 to which the fixed blade tool material 11 is fixed, the end portion is also bent to simultaneously form the fixed blade base metal plate 17, and then the fixed blade. A fulcrum shaft 18 is provided on the base metal side plate 17. Next, the plate-shaped fixed blade tool material 11 was placed on and fixed to the side surface 16 of the L-shaped fixed blade base metal to complete the fixed blade 1. The fixed blade 1 is made of two parts, a fixed blade tool material 11 and a fixed blade base metal 15, but if the situation allows, a thin blade tool material is formed by bending to form the fixed blade tool material 11 and the fixed blade base metal. 15 and 15 may be integrally formed. Further, for the joining of the fixed blade cutting material 11 and the fixed blade base metal 15, a method such as fixing with an adhesive, welding, riveting, screwing or the like may be appropriately selected. Further, the fulcrum shaft 18 is formed by using a method of fixing a separately manufactured shaft, a method of projecting by embossing to form a shaft, or the like. Next, the movable blade 2 was manufactured. The thin movable blade material is bent to form the movable blade side plate 23, and at the same time, the movable blade side plate 23 is provided with the fulcrum shaft hole 24. The fixed blade 2 is integrally formed by bending and forming from a thin plate material, but it can also be made of two members of a blade material and a base metal like the fixed blade.

The assembled state of the fixed blade and the movable blade manufactured as described above will be described. A fulcrum shaft hole 24 provided in the movable blade side plate 23 is rotatably supported by the fulcrum shaft 18 of the fixed blade base metal side plate 17. At this time, the fixed blade 1 is positioned within the circle of the movable blade edge locus circle 22 so that the fixed blade edge 12 and the movable blade edge locus circle 21 are in contact with each other. Furthermore, the blade edge 12 of the fixed blade and the blade edge 21 of the movable blade need to form a shear angle, and the blade edge 12 of the fixed blade and the blade edge 21 of the movable blade gradually separate from each other toward the cutting end side, Assemble. FIG. 3 shows this state. Further, since the fixed blade 1 and the movable blade 2 are not provided with the pressure contact means, the pressure contact and the biting angle are adjusted by adjusting the dimensional accuracy so as to be obtained by the bending of the movable blade. The cutting device manufactured as described above was attached to a facsimile to perform a cutting test. The cutting device is arranged so that the plane 14 of the fixed blade is parallel to the path line of the paper and the non-edge 13 of the fixed blade.
Was mounted at a position as close as possible to the platen roller 3. Then, after passing the paper, the paper was cut after passing through a gap between the blade edge 12 of the fixed blade and the blade edge 21 of the movable blade to a predetermined length. FIG. 5 shows the situation during paper passing. The leading edge of the paper could pass through the guide without difficulty. FIG. 4 shows the situation of the fixed blade and the movable blade during the cutting of the paper. In the present embodiment, since the gap between the non-blade tip 13 of the fixed blade and the platen roller 3 needs to be reduced as much as possible, the fixed blade is a cutting device which is completely fixed, but depending on the situation, the guide may be slightly shaken. If not, the present invention can be applied to those using a fixed blade that swings.

[0011]

As described above, according to the present invention, the fixed blade edge material is also used as the guide to reduce the number of gaps into which the leading edge of the paper, which may cause a paper jam, easily penetrates, and thus the paper jam. Can be prevented, and the step between the guide and the cutting position of the paper can be eliminated, so problems such as paper creases can be solved, and the fixed blade is inscribed in the cutting edge trajectory circle of the movable blade. It is possible to downsize the device as well. Furthermore, with such a structure, it is possible to improve dimensional accuracy by reducing the number of parts,
An inexpensive and highly reliable cutting device can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a sheet material cutting device according to the present invention.

FIG. 2 is a side view showing an embodiment of the sheet material cutting device according to the present invention.

FIG. 3 is a perspective view showing a state in which a shear angle is applied to the sheet material cutting device according to the present invention.

FIG. 4 is a perspective view showing a situation during cutting of the sheet material cutting device according to the present invention.

FIG. 5 is a cross-sectional view showing a sheet passing state in the sheet material cutting device according to the present invention.

[Explanation of symbols]

 1 Fixed Blade 11 Fixed Blade Cutting Material 12 Fixed Blade Edge 13 Fixed Blade Anti Blade Edge 14 Fixed Blade Plane 15 Fixed Blade Base Metal 16 Fixed Blade Base Side 17 Fixed Blade Base Side Plate 18 Support Shaft 2 Movable Blade 21 Movable Blade Blade edge 22 movable blade edge circle 23 movable blade side plate 24 fulcrum shaft hole 3 platen roller

Claims (1)

[Claims] 1. A movable blade, both ends of which are rotatably or swingably supported, and one end of a thin plate-shaped tool material forms a cutting edge of a fixed blade, and the other end is close to a platen roller. It consists of a fixed blade that forms a counter-edge, the plane of the fixed blade is approximately parallel to the path line of the sheet material, and the blade edge of the fixed blade is mounted at a position that is inscribed in the blade edge locus circle of the movable blade, A sheet material cutting device, wherein a flat surface of a blade guides the sheet material.