Printing – Rolling contact machines – Rotary
Patent
1997-10-17
1999-03-09
Hilten, John
Printing
Rolling contact machines
Rotary
101183, B41F 502, B41F 13004
Patent
active
058786651
ABSTRACT:
A control system for controlling the rotational speed of the printing cylinders of a printing machine in order to eliminate register offset or doubling phenomena on the printed matter. The control system uses one or more sensors to determine the operating condition of the printing unit. The relevant operating condition parameters include the frequency of the AC line from which the printing machine operates and the position of the printing cylinders at the time the change in rotational speed is to occur. Based on the operating condition of the printing unit, a controller selects an appropriate timing ramp for increasing or decreasing the rotational speed of the printing cylinders. The various timing ramps are stored on a memory and correspond to the different operating conditions of the printing unit. Once, the appropriate timing ramp has been selected, the controller controls the rotational speed of the drive motor that rotates the printing cylinders in a manner that is proportional to the rate of change and duration characteristics of the selected timing ramp.
REFERENCES:
patent: 4428288 (1984-01-01), Harper et al.
patent: 4791866 (1988-12-01), Kanno et al.
patent: 4951567 (1990-08-01), Rodi et al.
patent: 5588362 (1996-12-01), Sugiyama et al.
Colilla Daniel J.
Hilten John
MAN Roland Druckmaschinen AG
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