| 摘要 |
A sheet supporting drum during development in machines for electrostatically preparing printing matrices is disclosed. The drum is provided with front or head and rear or tail grippers, of which the rear or tail gripper is displaceable, wherein the latter comprises a fillet or section carried by arms passing through slots in the drum shell and mounted on a rotable common shaft carried by bearing means that can be angularly displaced about an axis coincident with the drum axis of rotation.
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