Printing – Planographic – Dampeners
Patent
1976-09-13
1977-12-27
Fisher, J. Reed
Printing
Planographic
Dampeners
101366, B41F 724, B41L 2506
Patent
active
040648010
ABSTRACT:
The disclosed system controls through novel pressure and valving adjustment mechanisms the application of dampening fluid to the ink roll or offset plate on the plate cylinder of an offset printing press. In one embodiment the dampening fluid at a relatively high pressure passes through a pressure compensator which adjusts the fluid pressure in response to changes in the speed of the press. The fluid at the adjusted pressure is then directed to the spray bar of the system, where it is discharged through a plurality of spray nozzles controlled by a plurality of solenoid-actuated valves. In one embodiment, the valves continually fluctuate between open and closed positions, with the time of the fluctuations being adjustable in order to selectively and accurately meter the amount of dampening fuid applied to the offset plate on the plate cylinder of the press. In a second embodiment, the valves are adjustable and continuously open during spraying, and in a third embodiment the degree of opening of the valves is regulated in response to changes in the press speed and the pressure may be maintained at a manually adjustable level.
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patent: 3871615 (1975-03-01), Donner
patent: 3937175 (1976-02-01), Horner
Fisher J. Reed
Ryco Graphic Manufacturing Inc.
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