Appeal No. 1998-1024
Application 08/511,703
The purpose of the present invention is to produce a constant power flow throughout the gear train to
cause a constant bracing effect in the gear train and thereby assure registration between the plurality of
printing units (2). The drive includes a separate motor (5) for each printing unit (2) to achieve a
reduction in the loading of the gear train. A control device (7,8) for controlling the separate motors
includes a determining means for determining load torque changes in the printing units (2). Said control
device (7,8) is supplied with information regarding printing-specific variables from control busses (9,
29). The control device (7,8) including a memory (8.1-8.6, 8') for storing characteristic curves relating
load-torque changes of the motors to various printing-specific variables provided by the control busses
(9.29). Examples of the printing-specific variables are; rotational speed of the printing press, viscosity
of the printing ink, ink distribution, and temperature of the inking and dampening units. Representative
claim 1 is set forth below.
1. Drive for a printing press with a plurality of printing units mechanically interconnected
through the intermediary of a gear train, the printing units being associated with respective drive motors
for supplying power to the gear train in a preset torque ratio, comprising a control device, means for
supplying to said control device information regarding printing-specific variables, said control device
having means for determining, from said printing-specific variables, load-torque changes in the printing
units, individually, and for energizing the drive motors so that power flow in the gear train is constant
when averaged over time.
The prior art references of record relied upon by the examiner as evidence of obviousness are:
Tappert et al. (Tappert) 4,566,385 Jan. 28, 1986
Rodi 5,036,764 Aug. 6, 1991
Mamberer 5,117,753 June 2, 1992
2
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