Printing – Planographic – Dampeners
Patent
1990-10-03
1992-08-04
Burr, Edgar S.
Printing
Planographic
Dampeners
101363, B41L 2502
Patent
active
051349353
ABSTRACT:
An improved lithographic dampener of the type having continuous plate/form roller/metering roller contact, adaptable to a variety of press configurations and operating speeds, employs a friction-driven oscillator roller that distributes added dampening liquid and the ink/liquid emulsions on the metering roller, to avoid continuing patterns which might cause ghosting in printed images. The dampener has a simple drawer-like configuration, with an open front for improved range of form roller/plate contact. A pan with a remote supply of dampening liquid, is located under the rollers such that the metering roller surface contacts and picks up liquid from a pool in the pan. Simplified seal dams at the ends of the form/metering rollers' nip keep the reservoir of liquid in that nip, yet minimize wear of the seal configuration. A slide block mounting of the metering roller and oscillator rollers allows independent adjustment of pressure at the form/metering rollers' nip, and at the metering/oscillator rollers' nip.
REFERENCES:
patent: 3283741 (1966-11-01), Brodie
patent: 3343484 (1967-09-01), Dahlgren
patent: 3559569 (1969-02-01), Jurny
patent: 4841855 (1989-06-01), Marcum
patent: 4852515 (1989-08-01), Teraska et al.
Hayes Thomas
Wall Robert
Burr Edgar S.
Hendrickson Lynn D.
Nauman Joseph G.
Yarn Products Company, Inc.
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