| 摘要 |
An improved sheet gripper system disposed on the impression cylinder of a printing press having regular sheet grippers mounted on a gripper shaft on the impression cylinder with additional grippers provided in the spaces between the regular grippers, which spaces are intended for cooperating transfer grippers, the additional grippers being adapted to retract into a gripper channel and extend out into the gripper plane only in one zone of the movement of the impression cylinder in which the between-gripper spaces are freed of the cooperating transfer grippers so that the front edge of a sheet is held by both the regular grippers, as it passes through the printing zone, and the additional grippers and the tension to which the printing material is subjected is greatly reduced, and the registry and print quality are improved.
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