Adjustment apparatus with DC drive system for use in a printing

Details Adjustment apparatus with DC drive system for use in a printing Adjustment apparatus with DC drive system for use in a printing

1990-11-06

1992-07-07

Wiecking, David A.

Printing

Rolling contact machines

Rotary

101181, B41F 1334

Patent

active

051273241

ABSTRACT:
A plate cylinder of an offset printing press is adjustable. A motor has an output shaft operatively connected with the plate cylinder to, when driven, adjust the position of the plate cylinder. A tachometer provides a speed reference signal indicative of the rotational speed of the plate cylinder. A register mark error sensor provides an adjustment control signal indicating that the plate cylinder should be adjusted. A computer responds to the speed reference signal and the adjustment control signal to control a DC drive. The DC drive drives the motor at a speed which varies with the rotational speed of the plate cylinder. The plate cylinder is thereby moved to a desired position at a rate which is a function of the operating speed of the printing press. The plate cylinder is moved to the desired position at a slow rate when the printing press is operating at a slow speed and at a fast rate when the printing press is operating at a fast speed. By moving the plate cylinder to the desired position at a rate which varies with the operating speed of the printing press in this manner, the plate cylinder is adjusted a constant angular distance for each revolution of the plate cylinder.

REFERENCES:
patent: 3915090 (1975-10-01), Horst et al.
patent: 4072104 (1978-02-01), Schaffer
patent: 4271379 (1981-06-01), Eckelmeyer
patent: 4781317 (1988-11-01), Ditto
patent: 4785734 (1988-11-01), Kamann

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