Sheet punching device and image forming apparatus having the same

Abstract

A sheet punching device that cuts holes in a sheet while punches are entering die holes, in which a plurality of punch trains along each of which a plurality of punches are aligned on a rotating shaft in parallel with the rotating shaft are disposed in the rotation direction of the rotating shaft, and the die holes are disposed in correspondence with the punches of the punch trains.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a sheet punching device for cutting a hole in a sheet, and an image forming apparatus, such as a copying machine, a printer, a facsimile machine, and a composite equipment of those devices, provided with the sheet punching device. [0003] 2. Related Background Art [0004] Up to now, a sheet punching device includes punches and dies of the number corresponding to the number of holes to be cut in a sheet and cuts the holes in the sheet while the punches are entering die holes, respectively. [0005] However, the conventional sheet punching device is equipped with only the combination of the paired punches and dies of the same number as that of the holes to be cut in the sheet. For that reason, because the punches and the dies are quickly worn, the punches and the dies must be frequently replaced by new ones, resulting in a low efficiency of punching the sheet. [0006] Also, because the numb...

AI Technical Summary

Benefits of technology

Enhances punching efficiency by reducing wear on punches and dies, enabling adaptation to different hole configurations without needing frequent replacements, thereby improving productivity in image forming apparatuses.

Problems solved by technology

For that reason, because the punches and the dies are quickly worn, the punches and the dies must be frequently replaced by new ones, resulting in a low efficiency of punching the sheet.

Also, because the number of holes to be cut in the sheet is different depending on the respective countries, if the conventional sheet punching device is adapted to a standard of one countries, it can not be adapted to a standard of other countries.

For example, in Japan, there are many cases in which two holes are cut in the sheet, and the sheet punching device that cuts two holes in the sheet cannot be adapted to such standard as of U.S.A. in which three holes are cut in the sheet.

Also, since an image forming apparatus with the conventional sheet punching device is low in the punching efficiency of the sheet punching device, the efficiency of forming an image on the sheet is low.

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