| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lead blade, can prevent bending of a sheet material at a cut line while the sheet material is not crushed at a half-cut part. Ž<P>SOLUTION: In the lead blade having a high blade part 11a for forming a full-cut part and a low blade part 11b for forming a half-cut part for forming, in a sheet material such as corrugated board, a lead in which the full-cut part extending to both sides of the sheet material and the half-cut part cut to the middle in its thickness direction are alternately continued, the low blade part 11b includes a plurality of protruding parts 11c, each of the protruding part 11c having a gradient at its cutting edge, and a recessed part 11d is provided between the adjacent protruding parts 11c. Since the protruding part 11c of the low blade part 11b bites into the sheet material successively from a portion with high cutting edge, the sheet material such as corrugated board is never strongly pressed or crushed, and a connection part is formed in the half-cut part by the recessed part 11d, whereby the sheet material is hardly bent in a position other than a predetermined position when making a box from the sheet material, and body bulging in stacking can be also prevented. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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