| 摘要 |
An offset printing machine including an impression cylinder, a sheet feed cylinder and a blanket cylinder. An outer peripheral surface of the blanket cylinder is divided into a plurality of color sections in a circumferential direction thereof, and an outer peripheral surface of the sheet feed cylinder has a peripheral length equal to the circumferential length of each color section. A sheet held in the sheet feed cylinder is transferred to the impression cylinder each time the sheet feed cylinder rotates a predetermined number equal to the number of the color sections. One of impression cylinder grippers and a sheet feed cylinder gripper intermittently confront with each other upon rotation of these cylinders. The sheet feed cylinder gripper is moved away from the impression cylinder gripper at the confrontation timing when a sheet is held on the impression cylinder by the impression cylinder gripper, so that any damage to the sheet held on the impression cylinder by the sheet feed cylinder gripper is avoidable.
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