Patent ID: 6564709
Filing Date: 2003-05-20
Classification: B41F

Abstract:
A device for transmitting rotary motion to a plate-holding impression cylinder of a plate mounting machine for flexographic printing, comprising: first motor means; a backup roll which is actuated in rotation by said first motor means, said backup roll being adapted to be covered by a sheet of paper provided with reference markings; a beam, having a head associated therewith; crescent-shaped rests arranged at said beam rests to rotatably support end pivots of said impression cylinder; second motor means for actuating said impression cylinder; a jacket covering said impression cylinder for mounting said printing plate; said beam and backup roll being provided at the front of the machine in a horizontally parallel arrangement which allows movement thereof with respect to each other between a mounting position and a printing position, and said impression cylinder and said backup roll having synchronized peripheral speeds in said printing position; a gear which is coaxial to said impression cylinder and is rotatably supported by said head associated with said beam, said gear being actuatable by said second motor means; first and second coupling elements; and a hollow transmission shaft which is coaxial to said gear and detachably engages at a first end, through said first coupling elements, one of said end pivots and engages at a second end, through said second coupling elements, said gear, said transmission shaft, with reference to said mounting position, being movable coaxially to said gear between a retracted disengagement configuration and a protruding configuration for connecting said first and second coupling elements to said impression cylinder and to said gear in order to rotationally couple said impression cylinder to said second motor means.