JPS643670Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a cutting device used for cutting sheet materials such as paper and film rolled into rolls for use in facsimile machines, printers, etc. .

[Conventional technology]

Conventionally, a guide made of sheet metal or the like is attached to a fixed blade in order to smoothly insert a sheet material into a cutting device. Generally, when connecting a fixed blade and a guide, a method is used to compensate for machining errors between the guide's mounting hole pitch and the mating fixed blade's mounting hole pitch by making elongated holes on one or both sides. There is.

[Problem that the invention attempts to solve]

In recent years, this type of cutting device has become a thin-walled blade, and the rigidity of the blade has tended to be significantly reduced. Furthermore, a guide attached to a fixed blade for the purpose of smooth conveyance of sheet material tends to have greater strength due to bending rigidity than the rigidity of the fixed blade. Therefore, when the fixed blade and the guide are fastened together using screws, the distortion during machining of the guide will affect the straightness of the cutting edge. However, there was a problem in that the precision of the engagement of the blades was disrupted, resulting in poor cutting.

[Means for solving problems]

The present invention is a cutting device characterized by being provided with a guide having a shape that does not affect the precision of the cutting edge of the fixed blade.

In other words, by significantly reducing the rigidity of the mounting hole of the guide that is attached to the fixed blade by providing a slit near the mounting hole, the influence of machining distortion of the guide and distortion that occurs when fastening with screws can be reduced. This aims to solve the conventional problems by using a guide shaped to absorb the deflection.

〔Example〕

FIG. 1 shows an embodiment of the present invention. FIG. 2 shows details of the mounting hole shown in FIG. 1. In this embodiment, slits 2 are provided on both sides of the mounting hole 1, and the mounting portion 3 has a neck portion 4 that is easily flexible in directions A and B, and is integrated with the guide body 5.

In this embodiment, the rigidity of the attachment portion can be significantly reduced relative to the guide body. The distortion that occurs when processing the guide and the distortion that occurs when tightening the screws are
By providing a slit in the mounting portion and making the guide more flexible in the directions A and B shown in FIGS. 1 and 2, absorption became possible.

FIG. 3 is another embodiment of the invention.

By providing slits 8 extending up to the paper passing surface 9 on both the left and right sides of the mounting hole 7, it is possible to further improve the effects of bending rigidity.

FIG. 4 shows an example of a cutting device equipped with a guide according to the present invention.

Note that FIG. 5 is a perspective view showing an example of a conventional guide.

[Effect of idea]

According to the present invention, the distortion caused during processing of the guide and the distortion caused when installing the guide conventionally disrupted the accuracy of the cutting edge of the fixed blade and caused cutting defects, but this method eliminates the distortion caused by the guide to the fixed blade. This makes it possible to significantly improve the cutting stability of a cutting device having a fixed blade in the form of a thin plate.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the guide according to the present invention, FIG. 2 is a plan view of the mounting hole shown in FIG. 1, and FIG. 3 is a perspective view showing another embodiment of the guide according to the present invention. FIG. 4 is a perspective view of a cutting device equipped with a guide of the present invention, and FIG. 5 is a perspective view showing a conventional guide shape. 1: Mounting hole, 2: Slit, 3: Mounting part, 4:
Neck, 5, 6: Guide body, 7: Mounting part, 8: Slit, 9: Sheet material passing surface, 10: Mounting hole,
A: Deflection direction of the attachment part (total length direction), B: Deflection direction of the attachment part (plate thickness direction).

Claims (1)

[Scope of utility model registration request] A rotary blade whose both ends are rotatably supported, a thin blade-like fixed blade whose cutting edge is pressed against the rotary blade by a spring, and a fixed blade that is fastened to the fixed blade through a mounting hole provided in the blade to attach the material to be cut. What is claimed is: 1. A cutting device comprising a guide for guiding a blade to a predetermined position, characterized in that a slit is provided in the vicinity of a mounting hole of the guide fastened to the fixed blade.