Arrangement for reversing pressure of cylinders and rollers in printing machines
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United States of America Patent
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Jun 13, 1989
Grant Date -
N/A
app pub date -
Oct 30, 1986
filing date -
Oct 31, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A main hydraulic circuit for controlling printing pressure of a printing machine is supplemented by an auxiliary high pressure generating circuit which becomes effective only after the pressure flow reversal in the main hydraulic circuit. The auxiliary circuit includes a pressure transformer or a hand-operated auxiliary pump connected via a back pressure valve to a hydraulic motor in the main circuit, and a second back pressure valve connected in series with a driving pump in the main circuit.
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