Film dampener unit for offset printing presses

Details Film dampener unit for offset printing presses Film dampener unit for offset printing presses

1990-03-07

1990-11-27

Fisher, J. Reed

Printing

Planographic

Dampeners

101352, B41F 726, B41F 736, B41F 740

Patent

active

049727710

ABSTRACT:
This invention concerns a film dampener unit for offset printing presses, with a dampening medium container in which a constant level of dampening medium is maintained, and with a dampener ductor of pan roller dipping into the dampening medium and transferring the dampening medium as a film onto at least one form roller which contacts the printing plate on the plate cylinder, whereby the thickness of the dampening medium film is determined by a metering roller which engages the dampener ductor roller surface in its rotary motion before the same engages the form roller. In order to reduce the number of rollers required for a flexibly operating dampener unit, the dampener ductor of this invention also functions as a dampener vibrator or oscillating ductor, having in addition to a rotation drive, another drive mehcanism which effects an axial back and forth or reciprocating movement.

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