Abstract: A plate cylinder of a rotary printing press having a cylindrical outer surface which forms a resting surface for a printing plate which is to be clamped thereon, and having a receiving gap which is open towards the outer surface and extends transversely to the circumferential direction of the cylinder, within which gap there is a clamping device for the printing plate which has a displaceable clamping element, is disclosed. This clamping element is displaceable, for the fastening or loosening of the printing plate, along a path concentric to the axis of rotation of the plate cylinder in the circumferential direction of the cylinder.

Abstract: In a lithographic printing press for printing on material in sheet or web form, a plate cylinder has a printing form mounted thereon. A gapless blanket cylinder is engageable with the plate cylinder and a tubular, removable blanket having a continuous surface is mounted on the blanket cylinder. Mechanisms to expand a cylindrical sleeve are provided as well as mechanisms to reduce cylinder distortion during rotation.