Device for engaging a sheet with maintenance of register and dis

Details Device for engaging a sheet with maintenance of register and dis Device for engaging a sheet with maintenance of register and dis

1987-08-27

1989-04-25

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to align sheet

271237, 271276, 271208, B65H 914

Patent

active

048240940

ABSTRACT:
A suction roll sheet transfer device disposed between a sheet feed table and the front lays of a sheet fed rotary printing press including a first set of suction rolls adapted for oscillating movement between a position substantially in the plane of said feed table for engaging successive sheets under suction pressure and transferring the sheet in register toward the front lays of the press and a raised position for engaging a preceeding sheet and separating it from the following sheet disposed therebelow, even when the sheets are in strongly adhering relation to each other during high speed printing operations. Suction pressure is communicated to the suction rolls in predetermined timed intervals, commencing upon retraction of the suction rolls substantially to the plane of the feed table. In a second embodiment, non-displaceable suction rolls are disposed immediately below the plane of the feeder plate upstream of the oscillating suction rolls for engaging successive sheets, under the influence of suction pressure, and guiding the sheets onto the oscillating suction rolls. In that embodiment, deionizers with air nozzles are disposed between the oscillating suction rolls and the non-displaceable suction rolls for directing a timed, pressurized air flow against successive sheets to facilitate separation of the partially overlapping sheets.

REFERENCES:
patent: 2160906 (1939-06-01), Reinartz
patent: 3190644 (1965-06-01), Schwebel

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