| 摘要 |
A punch unit, comprising: a punch driver (24) with base (32); a spring bearing; a compression spring (34) between base (32) and spring bearing; a punch (10) threadedly and removably connected to punch driver (24); a guide bushing (12) with an open end to receive punch driver (24); safeguarding members (36, 38) positioned on punch driver (24) and guide bushing (12) to prevent relative rotation between punch (10) and punch driver (24) during a punch stroke. Safeguarding members comprise at least one radial protrusion (38) axially arranged on punch driver (24), and at least one axial groove (36) being open at an open end in guide bushing (12).
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