| 摘要 |
A paper punching device is disposed on a paper conveyer passage for punching plural holes in a paper that passes on said paper conveyer passage, and comprises plural punches disposed on the upper side of said paper conveyer passage at right angles with the direction in which the paper is conveyed, plural pushing members mounted on the upper ends of said plural punches, and a punch-operating mechanism for operating said plural pushing mechanisms. The punch-operating mechanism comprises a cam shaft disposed along a direction in which said plural pushing mechanisms are arranged, plural cams mounted on said cam shaft, a cam drive mechanism for rotatively driving said cam shaft, and a cam position change-over mechanism which operates said cam shaft in the axial direction so as to be selectively brought to a first position where some cams out of the plural cams correspond to some pushing members out of said plural pushing members and to a second position where the other cams out of said plural cams correspond to the other pushing members out of said plural pushing members.
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