Apparatus and method for corner cutting and edge bending of lith

Details Apparatus and method for corner cutting and edge bending of lith Apparatus and method for corner cutting and edge bending of lith

1998-05-15

1999-10-26

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

With cutting

72319, B21D 504

Patent

active

059707747

ABSTRACT:
An apparatus and a method configure lithographic plates by cutting corners and bending edges in preparation for use in web offset printing. The lithographic plate is precisely aligned and immobilized on a support bed, which has bending anvils at opposing edges of the bed. A corner die cutter advances into position above a corner of the plate, cuts a corner of the plate and then retracts. An eccentric camming member for bending the plate edges has full bearing supporting ends and additional bearings intermediate the ends. The eccentric camming members lower to the plate and rotate within their bearings to form bends of selected angles in opposing edges of the plate. The eccentric camming members are then counter rotated and raised to their position above the plate. The movements of the corner die cutter and the eccentric camming member are precisely sequenced with each other by programmable logic control.

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