| 摘要 |
PROBLEM TO BE SOLVED: To provide a punching device allowing a time necessary for replacement to be shortened and a working efficiency to be increased by facilitating the replacement procedure for a boring device and the boring device used for the punching device. SOLUTION: A square punch holder 2a is an elongated hole vertically formed in a drilled face to a back plate 3, and the cross sectional shape of the square punch holder 2a is identical to that of the fixed part of a square punch 5. Also, a square punch fixing hole 8a screwed with a set bolt 8 is provided in the side face of the punch plate 2. The square punch fixed hole 8a is drilled in the drilled face parallel with each other to the square punch holder 2a, and reaches the fixed part of the square punch 5 fitted to the square punch holder 2a. The square punch 5 is fitted to the square punch holder 2a, and fixed by tightening the set bolt 8 screwed to the square punch fixing hole 8a. COPYRIGHT: (C)2004,JPO
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