Automatically controlling water feedrate on a lithographic press

Details Automatically controlling water feedrate on a lithographic press Automatically controlling water feedrate on a lithographic press

1985-04-29

1990-11-27

Fisher, J. Reed

Printing

Planographic

Processes of lithographic printing

101148, 101487, 101DIG45, B41F 726, B41F 3100

Patent

active

049727745

ABSTRACT:
The invention relates to a method for automatically controlling the water feedrate on a lithographic press which includes a blanket cylinder, a plate cylinder, inking rollers and dampening rollers. The temperature of the fountain solution is regulated so as to be constant. The alcohol concentration is regulated so as to be constant. The ink film thickness on one of the inking rollers is sensed to provide a signal proportional to that variable. The sensing of the ink film thickness on the inking roller is used to determine the water feedrate to the plate cylinder and the rate of water feed is dependent upon the ink film thickness.

REFERENCES:
patent: 3557817 (1971-01-01), Royse
patent: 4151796 (1979-05-01), Uhrig
patent: 4156388 (1979-05-01), Mabrouk et al.
patent: 4480542 (1984-11-01), Jeschke
patent: 4485737 (1984-12-01), Jeschke
Research Progress Report No. 113, "Control of Ink-Water Balance", Graphics Arts Foundation, 1981, Pittsburgh, Pa.

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