Pregripper for a printing machine

Details Pregripper for a printing machine Pregripper for a printing machine

1995-10-25

1996-11-19

Burr, Edgar S.

Printing

Work supporting members

Grippers

101232, B41F 130

Patent

active

055752098

ABSTRACT:
A pregripper for transferring sheets from a sheet feeder to a feed drum or impression cylinder of a printing machine is provided. The pregripper is disposed below the sheet feeder and includes a hollow tube which has a substantially pear-shaped cross-section. The pear-shaped cross-section is defined by a first apex having a greater curvature and a second apex having a lesser curvature relative to the first apex. The hollow tube also has an exterior wall having a thickness that increases as the wall extends from the first apex to the second apex. A web which supports a conventional gripper bridge is attached to the hollow tube adjacent the first apex. The hollow tube is rotatably supported on each end by a journal such that the axis of rotation of the hollow tube is substantially concentric with the center of curvature of the second apex. In an alternative embodiment, the hollow tube has a plurality of openings extending therethrough substantially in the transverse direction which are adapted to prevent the build-up of a dynamic air pressure between the sheets and the pregripper.

REFERENCES:
patent: 5303650 (1994-04-01), Wieland

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