| 摘要 |
A punch assembly comprising a cylindrical clamper holder, a ram reciprocatingly movable therein and having an axial bore, a punch carried on the ram, a pair of clampers pivotally mounted on the clamper holder and releasably holding a fastening element, a pair of washers received in a lateral slot in the clamper holder and resiliently urged against the ram by springs, and a bolt-and-nut unit extending transversely through the axial bore of the ram and fastening the springs and the washers together.
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