| 摘要 |
A punch device of the invention comprises a jig having a corner punch area for punching a corner of the sheet material and an edge punch area for punching an edge of the sheet material, a corner punch block corresponding to the corner punch area, and an edge punch block corresponding to the edge punch area. Between the length L 1 of the corner punch area, the width W 1 of the corner punch area, the length L 2 of the edge punch area and the width W 2 of the edge punch area is established the relation of L 1 =W 1 =L 2 , W 2 <=½W 1 , and P=L 1 =L 2.
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