| 摘要 |
PROBLEM TO BE SOLVED: To make the number of punching holes changed smoothly by simple structure, and to miniaturize a size and enhance assemblage to reduce a cost. SOLUTION: Cams 28, 29 in part transmit rotational motions thereof to corresponding punch holding members 20, 21 in any position of the first and second positions when four cams 26-27 are switchedly slid to the first and second positions as a whole at a prescribed stroke along a driving shaft 33, but the other cams 26, 27 are not able to transmit rotational motions thereof to corresponding punch holding members 19, 22 when switched from first position to the second position.
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