Sheet lock for feed table in printing press

Details Sheet lock for feed table in printing press Sheet lock for feed table in printing press

1975-06-19

1976-09-07

Love, John J.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271227, 271229, 271237, B65H 714, B65H 708

Patent

active

039791157

ABSTRACT:
A device for interrupting the feeding of sheets to a sheet-fed printing press. A feed table is provided having stops to define the registered position of successively fed sheets. After a register interval during which the sheet settles against the stops the sheet is picked up by a gripper cylinder. Photocells are provided for detecting failure of a sheet to register during the register interval. The photocells energize a retaining device on the feed table having a retaining foot which presses downwardly against the non-registered sheet to prevent such sheet from being picked up by the gripper cylinder. A device providing a time delay is interposed ahead of the retaining device to delay operation of the retaining device for a brief time interval to insure that the preceding sheet picked up by the gripper cylinder is clear of the feed table. A latch is provided to maintain the foot in pressing engagement with the sheet, but the foot is resiliently mounted so that an offending sheet may be manually removed. In certain of the embodiments of the invention removal is limited to drawing the sheet in a direction opposite to the direction of normal flow.

REFERENCES:
patent: 2072235 (1937-03-01), Wormser
patent: 2708405 (1955-05-01), Gegenheimer

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