| 摘要 |
A quick-extraction punch-holder adaptor for converting punching machines from a single-punch to a multiple-punch configuration, connectable to a conventional turret of a punching machine, comprises a cylindrical body crossed by a plurality of punch accommodation receptacles, a selection device rotatably mounted at the end of the cylindrical body and provided, at a lower face, with a tooth for contact with the head of each selected punch and elastic elements, circumferentially interposed between the selection device and the cylindrical body, and being loadable by compression to contrast the active stroke and produce the return of the punches.
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