| 摘要 |
(a) O-shape ring (3) between a stripper (1) and a piercing punch (2); (b) a cylinder (1a) formed in the hole of the stripper; and (c) an inner hole (2a) of the punch passed through from the center of the punch bottom to the cylinder. In the dropping time of the punch, an air in the cylinder chamber is compressed as a result of volume reduction. Therefore scraps easily drop from the punch bottom by jetting the compressed air in the inner hole of punch.
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