Printing plate water sensing means and method
US4052937A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1975 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Jul 22, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F7/24
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The amount of water present on a lithographic printing plate during printing is determined by measuring the amount of water present on a surface which is other than that of the printing plate but which carries an amount of water related to the amount of water present on the printing plate. The surface upon which the measurement is made may be the surface of a control pad mounted on the printing roller in the gap between opposite ends of the printing plate, the surface of one of the rollers of the damp train applying water to the printing plate, or the surface of an auxiliary roller contacting one of the rollers of the damp train applying water to the printing plate. The amount of water subsequently applied to the printing plate may be regulated in dependence upon the amount of water determined as being already present on the printing plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.