Printing – Planographic – Dampeners
Patent
1989-10-05
1991-02-12
Fisher, J. Reed
Printing
Planographic
Dampeners
B41F 726, B41F 732
Patent
active
049915029
ABSTRACT:
In the damping system for an offset press according to the present invention, the rotational speed of a motor, which drives a water-applicator roller, is controlled such that the difference or slip between the peripheral speed of the water-applicator roller and the peripheral speed of the plate cylinder can be set to a desired value. To this end the damping system comprises a water-applicator roller which applies water, supplied from another roller, to a plate cylinder of the offset press. The water-applicator roller is in contact with the plate cylinder. A motor drives the water-applicator roller. A detecting device detects the rotational speed of the motor. A device detects the peripheral speed of the plate cylinder. A slip input device sets a desired difference between the peripheral speed of the plate cylinder and the peripheral speed of the water-applicator roller. A control controls the rotational speed of the motor with the peripheral speed of the plate cylinder being modified by the difference set by the slip input device. In addition, a clutch is provided for disengaging the motor from the water-applicator roller when the difference is out of a predetermined range. The motor for driving the water-applicator roller is provided separately from a motor which drives the plate cylinder. A water-fountain roller, which is in contact with water in a water bath to supply water to the water-applicator roller, is driven by another motor.
REFERENCES:
patent: 4686901 (1987-08-01), Arndt et al.
Fisher J. Reed
JPE Co., Ltd.
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