Lithograhic dampener
US5134935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1990 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Oct 3, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F7/26
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.