| 摘要 |
A tumbling hole punch consists of a serrated tube plunging straight through a film web into a hole in a backup roll. The serrated punch is mounted to an arm which is geared to the backup roll so that the punch remains in register with the hole in the roll. In order to keep the axis of the serrated punch aligned with the axis of the hole in the roll, the punch pivots relative to its arm, and the pivoting is controlled by a gear belt drive so that as the arm rotates the punch tumbles in the opposite direction, keeping its axis parallel with the hole axis.
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