JPS625914Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is applicable to devices such as copying machines and facsimile machines.
This invention relates to a rotary cutter used to cut rolled recording paper into arbitrary lengths.

As shown in Fig. 1, the structure of this type of rotary cutter conventionally used consists of a rotary blade 1 and a fixed blade 2 whose cutting edge is pressed against the rotary blade 1, and the rotary blade 1 is rotated once intermittently. The paper 3 is then cut. Further, in a rotary cutter having such a structure, it is desirable that the paper passing gap _C1 be as wide as possible. In other words, the paper edge 4 of the recording paper 3 originally has a curling tendency when it is wound into a roll, and often becomes corrugated due to changes in temperature and humidity, making it difficult for the recording paper 3 to stably pass through narrow gaps. This is because it may be difficult to do so. Increasing the gap _C1 can be achieved by increasing the cross-sectional dimension of the cutter. However, this method had the drawback of increasing the size of the cutter itself, which went against the general demand for smaller and lighter office equipment such as copying machines and facsimile machines.

The present invention aims to eliminate these drawbacks of conventional rotary cutters and provide a cutter that is small in size, has a wide paper passing gap, and can stably pass paper through.

In order to achieve this purpose, the rotary cutter of the present invention is arranged so that the direction of rotation of the cutting edge of the rotary blade at the cutting position and the direction of travel of the paper to be cut are almost the same, thereby reducing the paper passing gap. The invention is characterized by adopting a structure in which an elastically supported paper guide plate is attached in order to maintain a wide paper edge and prevent the paper edge from getting caught on the cutting edge of the fixed blade due to this arrangement. To explain this in detail based on the drawings, in FIG. The direction of movement of the cutting edge of the rotary blade 9 at the position of the cutting edge 8 substantially coincides with the advancing direction of the paper 10 (arrow A). By arranging the blades in this way, the paper passing gap _C2 can be made sufficiently wider than that of a rotary cutter with a conventional structure. However, it is possible to pass stably.
However, if the blades are simply arranged in this manner, the edge of the paper collides with the stroke 11 forming the cutting edge of the fixed blade 5, making it impossible to continue feeding the paper. In order to eliminate such drawbacks, the rotary cutter of the present invention employs a paper guide plate 13 that is elastically supported by a spring 12.
The tip 14 of the fixed blade is arranged so as to be slightly more protruding than the cutting edge 8 of the fixed blade. The paper guide plate 13 arranged in this way is pushed back by the rotating blade edge of the rotary phantom 9 when it rotates, and after cutting is completed, the paper edge caught on the blade surface 11 is lifted up for subsequent paper feeding. It plays the role of ensuring stable operation.

FIG. 3 shows a rotary cutter according to the present invention in which a cylindrical piece is used as the base metal 16 of the rotary blade 15.
It also serves as a guide for the paper, allowing for more stable paper feeding. Further, the paper guide plate has a structure in which a thin synthetic resin film 18 is pasted on a base metal 17, and due to the flexibility of the film itself, it can obtain the same effect as the paper guide plate 13 in FIG. It can have a simple structure.

As explained above, the rotary cutter of the present invention is arranged so that the direction of movement of the rotary blade tip at the cutting position and the paper passing direction are almost the same, and is elastically supported. It has a simple structure consisting of a paper guide plate to guide the paper, and has the effect of providing a wider paper passing gap and stably passing paper compared to conventional rotary cutters.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a conventional rotary cutter, and FIG. 2 is a sectional view showing an embodiment of the rotary cutter according to the present invention. FIG. 3 is a sectional view showing another embodiment of the present invention. 1, 9, 15: Rotating blade, 2, 5, 19: Fixed blade, 13, 18: Paper guide plate.

Claims (1)

[Scope of utility model registration request] A rotary cutter consists of a rotating blade that rotates intermittently once and a fixed blade that presses the cutting edge against the rotating blade.At the cutting position, the moving direction of the cutting edge of the rotating blade and the traveling direction of the sheet material to be cut are the same direction. A rotary cutter with a structure in which a sheet material guide plate is elastically supported and slightly protrudes from the fixed blade's cutting edge in the radial direction of the rotary blade's cutting edge locus circle.