Patent ID: 6609462
Filing Date: 2003-08-26
Classification: B41F,B41P

Abstract:
A method of avoiding register differences during the operation of a printing machine having a plurality of individual printing units, which comprises:counteracting, at least by circumferential register corrections, respective register differences (&Dgr;TR) in the individual printing units; determining control parameters (R1a,R1b) for different printing speeds and storing them in a memory, the control parameters including a speed-dependent portion and an acceleration-dependent portion; determining the register differences (&Dgr;TR) at different printing speeds by an automatic register measuring and register control device; measuring an interfering or disturbance variable (n) and forwarding it simultaneously to a controlled system and an interfering or disturbance-variable feed forward system; and in the event of changes in the printing speed, superimposing the previously determined magnitude of the control parameters (R1a,R1b) on the register differences (&Dgr;TR) of the automatic register measuring and register control device.