Printing – Planographic – Dampeners
Patent
1990-02-23
1991-09-10
Crowder, Clifford D.
Printing
Planographic
Dampeners
101350, 101451, B41F 726
Patent
active
050464183
ABSTRACT:
The dampening apparatus and method provides automatic ink/water control for a lithographic printing press by means of a hydrophylic metering roll in a pan for fountain solution which contacts an oleophylic transfer roll. The transfer and metering rolls are free wheeling friction driven rolls which are driven in substantially a one-to-one surface speed ratio by friction between the transfer roll and a dampener form roll to cause the metering roll to provide an unmetered excess of dampening fluid from the pan to a nip with the transfer roll. The dampener form roll is positively driven from the drive system for the press plate cylinder at a one-to-one surface speed ratio with the plate cylinder and is a resilient oleophylic roll having a durometer within the range of 20 to 30 durometer. The transfer roll is harder and of different diameter than the dampener form roll with a durometer in the range of from 30 to 60 durometer.
REFERENCES:
patent: 3168037 (1965-02-01), Dahlgren
patent: 3911815 (1975-10-01), Banfer
patent: 3937141 (1976-02-01), Dahlgren
patent: 4676156 (1987-06-01), Aylor et al.
patent: 4724764 (1988-02-01), MacPhee et al.
patent: 4949637 (1990-08-01), Keller
Koehler James E.
McCaffrey Richard G.
Paularena David W.
Crowder Clifford D.
Dahlgren International, Inc.
Yan Ren
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