Patent ID: 8225715

Claim:
A transfer drum to be disposed between printing units of a sheet-fed printing press, the transfer drum comprising: a drum body having an axis of rotation, having a linear guide and having journals for supporting said drum body for rotation in side walls; two gripper systems disposed on said drum body for extension in radial direction into operating position positions, depending on a selection of a mode of operation for printing on only one side of a sheet or of a mode of operation for printing on both sides of a sheet; one of said gripper systems being radially extended during printing on only one side of the sheet and including one gripper shaft parallel to said axis of rotation, a plurality of gripper fingers disposed to pivot on said one gripper shaft, and gripper pads associated with said gripper fingers; the other of said gripper systems being radially extended during printing on both sides of the sheet and including another gripper shaft parallel to said axis of rotation, and a plurality of pliers-type grippers each being formed of two gripper fingers disposed to pivot on said other gripper shaft; stops provided on said drum body and defining said respective operating positions of said gripper systems; cam mechanisms including stationary control cams and cam followers on roller levers to control rotation of said gripper shafts; and a support disposed in said drum body for radial adjustment in said linear guide to support said gripper systems diametrically relative to said axis of rotation of said drum body, said support being movable against said stops and said support being lockable in a respective operating position on said drum body.