| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sheet punching blade capable of reliably preventing a person from being injured by a punched sheet.SOLUTION: Cutting edges longitudinally continuing like a wave are formed with a pitch P of 0.5-5 mm at one side edge of a blade plate by alternately decentering the cutting edges to both sides. Slits with a width of 0.2-2 mm and a depth of 0.5-2 mm are formed on both curved top parts of the wave-like cutting edge in such a manner as to satisfy the expression; a pitch Q=(a natural number+0.5)P. An uncut part is formed with the pitch Q in the punched sheet.</p> |
