Water pulse spray dampening system and method for printing presses
US4708058A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1986 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Jun 20, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F7/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An offset lithographic press, as commonly found in the newspaper industry, is provided with an airless, pulsed spray dampening system for simplified, automatic control of the ink/dampening fluid balance. The dampening system is constructed in accordance with several critical parameters, including the center-to-center nozzle spacings, nozzle to adjacent roller spacings, as well as the frequency of pulses per minute, the duration of each pulse, and the pressure of the dampening fluid. Construction of a dampening system in accordance with the critical parameters enables the press to be operated with a minimum of user intervention, and the relatively small spacing between the nozzles and the adjacent rollers is such that the dampening system can be mounted adjacent the aisles between the press units for facilitating maintenance thereon. The system directs a continuous, carefully controlled supply of dampening fluid to the plate so that the latter can be satisfactorily used with a minimum of fluid and does not experience moisture variations cycling between wet and dry conditions. A spray bar provided with eight nozzles oriented in parallel relationship to the longitudinal axis of an ass…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.