| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress height deformation due to bending which causes irregular cutting without impairing durability of a blade. Ž<P>SOLUTION: A Thomson blade comprises a band-like thin plate and has a wedge-like blade edge 11 at one side end in a length direction and a plate-like protrusion 12 extending in the length direction along a center line in a thickness direction at the other side end. The height of the protrusion 12 is designed to be higher than a projected part on an inner diameter side due to bending. When bending is carried out, a projection is generated on the inner diameter side A at a bent part, but the projection is lower than the protrusion 12 along the center line in the thickness direction, so that when processing is carried out by a blanking die incorporated with the Thomson blade, a load received from a back side is uniformly applied to the protrusion and the load is sufficiently uniformly transmitted to the blade edge 11, and accordingly the irregular cutting is not caused at the bent part. Since the thickness of the blade edge 11 contacting with a sheet-like workpiece is normally secured, damage is not added to the blade edge 11 through punching, and accordingly blade chipping and blade breaking are not caused. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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