Lithograhic dampener

Printing – Planographic – Dampeners

Patent

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Details

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.

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