Patent ID: 7900559

Claim:
A mandrel-locking unit for a rotary printing machine comprising a mandrel-mounting element that forms a hollow body and accommodates in an enclosed form in an interior thereof a bearing for mounting a print roller mandrel having a mandrel-supporting surface and that is slideable between a mounting position in which the print roller mandrel is in engagement with the bearing and a release position in which the print roller mandrel is out of engagement with the bearing, a pressurizing medium cylinder including a pressure chamber with a piston located therein for sliding the mandrel-mounting element between the mounting position and the release position, the piston delimiting the pressure chamber at a boundary surface and being connected to the mandrel-mounting element at a connecting point for a transfer of force required for sliding the mandrel-mounting element, the boundary surface being a surface of the piston that is on a pressure chamber side of the piston, a distance between the boundary surface and the connecting point being smaller than a maximum stroke of the piston in the pressurizing medium cylinder, an inner diameter of the pressurizing medium cylinder being larger than an outer diameter of the mandrel-mounting element, and the pressurizing medium cylinder including a break-through that is open in the release position of the mandrel-mounting element such that the print roller mandrel and the mandrel-locking unit are separable from one another by a movement in relation to one another.