Dampening method and apparatus for automatic ink/water control for lithographic printing press
US5046418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1990 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Feb 23, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F7/26
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.