| 摘要 |
PROBLEM TO BE SOLVED: To improve working efficiency and to reduce a production cost in case of piercing to a new position by changing a piercing position by press working. SOLUTION: A change retainer for punch having a retainer main body, to which a shoulder punch is mounted to the mounting face of an upper die of a press die at a vertical position, is provided with a cam plate 10 displaceable between two positions and punch set blocks 11, 12 displaceable to the mounting face in the vertical direction by the displacement of the cam plate, the shoulder punches are fixed to respective blocks 11, 12, the shaft parts of respective punches are inserted into the through holes of the retainer main body, the respective blocks 11, 12 are made displaceable between the first position where a cutting edge of the punch is protruded to a piercing position and the second position where the cutting edge is retreated to a non-piercing position, the respective blocks are energized to a second position side, one of the blocks corresponding to the displacement position of the cam plate 10 is displaced to the first position.
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