Abstract: A sheet reversing unit for a sheet printing press which includes a reversing gripper device and a suction lever. A cam follower is pivotally mounted on a cam lever and is brought into contact with a cam surface of a cam mechanism for opening and closing the sheet gripper. A regulating cam is arranged outside the moving path of the cam follower, so as to prevent the cam follower from falling outside its normal moving path.
Abstract: The contact pressure and uniformity of the longitudinal contact between a plate cylinder and associated form rollers of a printing press can be adjusted at a single place by a cam arrangement. The cam arrangement also serves as throw-off mechanism for the form rollers. The uniformity is maintained substantially unaltered after subjecting the plate cylinder to a skewing adjustment.