Printing – Planographic – Dampeners
Patent
1983-12-23
1984-11-06
Crowder, Clifford D.
Printing
Planographic
Dampeners
101349, 101DIG24, B41L 2304, B41F 724, B41F 3310
Patent
active
044805420
ABSTRACT:
A device for ink profile-dependent regulation of dampening medium in an offset printing unit having an inking-dampening unit which, over the width of a type forme, supplies a dampening medium film of substantially uniform thickness to a plate cylinder and to an inking part of the inking-dampening unit includes a hydrophilic measuring roller, measuring means adjacent the measuring roller for determining extent of wetting of an outer cylindrical surface of the measuring roller section-by-section over the width of the measuring roller and for transmitting corresponding signals, means for varying the proportion of dampening medium in the ink film section-by-section, control means for converting the signals from the measuring means into adjustment commands and applying them to the proportion varying means for varying the proportion of dampening solution in the ink film section, the hydrophilic measuring roller being in cooperative engagement with a rubber-covered ink roller, the control means being actuatable in accordance with the signals and through the intermediary of the temperature on the cylindrical surface of the measuring roller for varying the quantity of dampening medium in at least an individual zone of the width of the measuring roller so that the dampening-medium film accepted by the measuring roller from the rubber-covered ink roller is influenced.
REFERENCES:
patent: 3134326 (1964-05-01), Davis
patent: 3822643 (1974-07-01), Mikan et al.
Crowder Clifford D.
Greenberg Laurence A.
Heidelberger Druckmaschinen
Lerner Herbert L.
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