Apparatus for laterally positioning sheets in printing machines

Details Apparatus for laterally positioning sheets in printing machines Apparatus for laterally positioning sheets in printing machines

1977-06-10

1980-02-12

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to align sheet

271250, B65H 912

Patent

active

041880277

ABSTRACT:
A printing machine has a sheet support surface along which a succession of sheets pass adjacent a lateral stop. An apparatus for laterally positioning the sheets against the stop has a displacer member which is laterally displaceable under the support surface between an outer position extending beyond the lateral stop and an inner position generally underneath and close to the lateral stop. A suction drawbar is limitedly laterally displaceable on the displacer member between a pair of end positions and has at least one suction aperture exposed at the support surface. Air is aspirated downwardly through this aperture so as to draw a sheet overlying the suction drawbar on the support surface against the drawbar. Lateral displacement of the displacer member from the outer position into its inner position displaces a sheet drawn suctionally against the drawbar laterally against the lateral stop. A biasing arrangement including at least one spring is provided for urging the drawbar on the displacer member into one of its end positions and for simultaneously permitting displacement of the drawbar on the displacer member toward the other of its end position against a predetermined biasing force of such magnitude that on engagement of a sheet held suctionally by the drawbar with the stop the drawbar moves relative to the displacer member.

REFERENCES:
patent: 2165172 (1939-07-01), Backhouse
patent: 3860233 (1975-01-01), Wiase

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