Water pulse spray dampening system and method for printing press

Details Water pulse spray dampening system and method for printing press Water pulse spray dampening system and method for printing press

1986-06-20

1987-11-24

Fisher, J. Reed

Printing

Planographic

Dampeners

101451, B41F 730, B41F 726

Patent

active

047080582

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 associated dampening system roller is detachably mounted to the frame and can be readily removed for repair or replacement.

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