Adjustment apparatus with DC drive system for use in a printing press
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 7, 1992
Grant Date -
N/A
app pub date -
Nov 6, 1990
filing date -
Nov 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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