Patent ID: 9021950
Filing Date: 2015-05-05
Classification: B41F,B41P,B65H,F16C,F16D

Abstract:
1. A printing cylinder assembly for a printing machine, wherein the assembly includes a rotating shaft, a sleeve cylinder removably mounted to fit on the rotating shaft so that it can be fitted on, and be extracted from, the rotating shaft, and a coupling mechanism for coupling and decoupling the sleeve cylinder to and from the rotating shaft, said coupling mechanism comprising a cam shaft and a coupling member with which the rotating shaft is provided, and coming into a coupling state that the coupling member moved diametrically of the rotating shaft is urged into fastening frictional contact with an inner diameter portion of the sleeve cylinder, thereby coupling the sleeve cylinder and the rotating shaft together, and a decoupling state that said coupling member is parted from the inner diameter portion of the sleeve cylinder, thereby decoupling the sleeve cylinder from the rotating shaft, by rotation of the cam shaft, wherein said cam shaft has a cam portion formed circumferentially with a planar and a circular arc surface, said coupling member comprises a movable pin held opposite to the cam portion, a pressure block held opposite to the inner diameter portion of said sleeve cylinder and a pressure elastic element interposed between said movable pin and said pressure block, whereby the movable pin when contacted with the cam portion's circular arc surface by a rotation of the cam shaft is moved to compress the pressure elastic element and to provide an increased elastic force, the increased elastic force driving the pressure block into such contact with the inner diameter portion of the sleeve cylinder and thereby establishing said coupling state, and the movable pin when contacted with the cam portion's planar surface by a rotation of the cam shaft decompresses the elastic element to restore its elastic force, the restored elastic force bringing the pressure block away from the inner diameter portion of the sleeve cylinder and thereby establishing said decoupling state.