Printing plate clamping assembly

Details Printing plate clamping assembly Printing plate clamping assembly

B - Operations, Transporting

41

F

101/118

B41F 27/12 (2006.01)

Patent

CA 1107141

ABSTRACT OF THE DISCLOSURE Clamping apparatus is provided for holding thin flexible printing plates in position on a press cylinder. In certain preferred embodiments, shim members are attached to the outer periphery of the press cylinder for accurately radially posi- tioning the printing plates with respect to the surface of the press cylinder. A clamping assembly is provided separately from and at a spacing from the shim members in a gap formed between facing edge portions of the shim members for releasably clamping one edge of the printing plate while the other edge of the prin- ting plate is engaged over one of the edge portions of the shim member. The shim members and the clamping assembly are indepen- dently and separately attachable to the press cylinder so that the shim members can remain in position while printing plates are exchanged, as well as during removal and/or adjustment of the clamping assembly. In order to accommodate reversal of the direction of clamping of the printing plates, a pair of symmet- rically arranged lock bars are hingedly mounted for selective engagement with detent portions of the printing plates. The detent portions in one set of preferred embodiments for use with very thin plastic plates are formed as apertures engage- able over pin sections of the lock bar. The detent portions in another set of preferred embodiments are formed as bent back edge portions which engage over a smooth lock bar. The shim members are provided with symmetrical facing undercut smooth surfaces for anchoring the leading edge of the printing plate, the trailing edge being engaged by one of the respective lock bars. The trailing edge of the printing plate is provided with a central recess for accommodating insertion of a tool to rotat- ably move the lock bar out of clamping engagement. The leading edge of the printing plate is provided with centering apertures engageable with a retaining spring clip clamped in position on the press cylinder by a base member of the clamping assembly.

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