| 摘要 |
An apparatus for supporting and actuating a punch in a press includes a cam unit body, a cam slide slidably supported on the cam unit body for movement along a first line and having first cam surfaces on opposite sides thereof which are angled with respect to the first line, and a U-shaped driver supported on the cam unit body for movement along a second line, the driver having a second cam surface on each leg thereof which is angled with respect to the second line. The slide is disposed between the legs of the driver and each second cam surface engages a respective first cam surface so that movement of said driver into said cam unit body along said second line moves the slide in one direction along the first line. A slotlike opening oriented parallel to the first line extends transversely through the slide and communicates with an internal cylindrical cavity within the slide, which cavity also extends parallel to the first line. A rod supported on the cam unit body extends through the opening and into the cavity. A coil spring is disposed in the cavity, engages the rod and urges the slide assembly in the opposite direction along the first line. A punch retainer is removably supported on the slide and has an opening therethrough parallel to the first line. The opening in the punch retainer is adapted to receive a punch and the punch is adapted to be held against rotation relative to the punch retainer. A punch backing surface aligned with and facing the opening in the punch retainer is provided on the slide.
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