| 摘要 |
A cap for securing a printing plate, sheet of paper, or other flat piece of material to a plate or bed having one or more registration pins, is provided. The cap has a resilient O ring for securing it to the pin. The cap is actually applied to, and removed from, the pin by a cap holding and releasing device. The cap holding and releasing device is mounted on an elevator which carries the printing plate (or paper etc.) to the bed and deposits it on the bed.
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