US 5,309,835 AGranted

Device for drawing and bending printing plates

AssigneeMAN Roland Druckmaschinen AG

InventorsGeorg Hartung, Helmut Schild, Manfred Herold

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Abstract

A device for drawing and bending the trailing edge of a printing plate onto a plate cylinder of a printing machine such as a sheet-fed rotary printing press, in which a pressure roller with an attached actuatable folding strip draws a printing plate, which has its leading print edge fastened into a tension rail, around the outer circumference of the plate cylinder as the plate cylinder is rotated, to a position where the folding strip is actuated thereby introducing the trailing edge of the printing plate into a second tension rail. The device provides a means for drawing the printing plate onto the printing cylinder with a desirable uniform tension and without requiring auxiliary devices for pre-folding the printing plate in order to secure the trailing printing plate edge into a tension rail.

Claims12

Dependent claims

A device for drawing and bending the trailing edge of a printing plate onto a plate cylinder of a sheet-fed rotary printing press wherein said plate cylinder includes an elongated channel disposed longitudinally in the periphery thereof for receiving and supporting means for gripping the leading edge of said printing plate adjacent the print start portion thereof and for receiving and supporting means for clamping and tensioning said trailing edge of said printing plate adjacent the print end portion thereof, said drawing and bending device comprising, in combination,

means including a pressure roller engageable with said plate cylinder for drawing said printing plate around the outer periphery of said plate cylinder as said plate cylinder is rotated with said leading edge held by said gripping means,
means including a folding strip disposed parallel to said pressure roller and in advance thereof with respect to the direction of rotation of said plate cylinder,
means for mounting said folding strip for movement relative to said pressure roller and into engagement with said trailing edge of said printing plate, and
actuating means for moving said folding strip relative to said pressure roller and into engagement with said trailing edge of said printing plate so as to bend said trailing edge inwardly with respect to said cylinder channel.

1 more element

Dependencies are inferred from the claim text.