Method and apparatus for driving a bridge roller on a printing p

Details Method and apparatus for driving a bridge roller on a printing p Method and apparatus for driving a bridge roller on a printing p

1994-04-18

1996-10-08

Fisher, J. Reed

Printing

Planographic

Dampeners

1014501, B41F 726, B41F 736, B41F 3110

Patent

active

055620310

ABSTRACT:
A printing press has a plate cylinder, an inking system and a dampening system. A bridge roller provides a path between the inking and dampening systems. The bridge roller is in contact with a dampening form roller, which in turn is in contact with the plate cylinder. The dampening form roller is driven by an arrangement that allows the dampening form roller to rotate at a differential speed with respect to the plate cylinder in order to clean hickies off of the plate cylinder. The speed of the bridge roller is controlled so as to provide a slip nip between the bridge roller and the dampening form roller and so as to control the ink-water balance, even when the dampening form roller is rotating at a differential speed.

REFERENCES:
patent: 3467008 (1969-09-01), Domotor
patent: 3986452 (1972-08-01), Dahlgren
patent: 4686901 (1987-08-01), Arndt et al.
patent: 5191835 (1993-03-01), Blanchard

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