Abstract

The invention is about a convenient way of fixing a sleeve over a mandrel in a press. The sleeve (20) is attached by applying a hydraulic pressure into the mandrel (16) which deforms itself and grips on the sleeve. The pressure is brought by a piston (36) mounted on a screw inside the mandrel, which when tightened increases the pressure and grips the sleeve.

IPC Classes  ?

• B41F 27/10 - Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
• B41F 30/04 - Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders

Abstract

The invention relates to a cover bearing system (14) to grip a sleeve (12) over a mandrel (16) in a printing press, in particular to how the gripper (24) is brought toward and away from the mandrel (16) and sleeve (12) assembly. The gripper (24) is disengaged from the sleeve (12), following first a straight path (42a) and then a helicoidal path (42b), thanks to an ad-hoc slot (42) machined on an axle (40). This allows to disengage the gripper (24) and set it out of the way for handling the sleeve (12), with a single motor (38) and a single instruction.

IPC Classes  ?

• B41F 13/20 - Supports for bearings or supports for forme, offset, or impression cylinders
• B41F 27/10 - Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders