Patent ID: 7100509

Claim:
A process for correcting a longitudinal registration error of a rotary printing press having a plurality of inking systems, at least two rollers arranged adjacent one another and directly involved in the printing process of an inking system, and a control unit, said rollers having respective axes of rotation joined by a connecting line, and at least one of said rollers having a printing plate, said process comprising: adjusting, by said control unit, a desired print line of the printing plate on a material web lying on one of the two rollers by controlling a drive of the two rollers so that, at least during a period of time, said rollers have different circumferential speeds, said step of adjusting by said control unit including, taking into account, by the control unit, a shift of the actual, effective print line on the circumference of both rollers arising as a consequence of an adjustment movement of one of the two rollers along an adjustment axis that does not run coincident with the connecting line of said axes of rotation of said two rollers but is at an angle thereto; and determining, by the control unit, values for correcting any longitudinal registration error in said print line from relative positions of the two rollers and the inking system, and said angle between the connecting line of the axes of rotation and the adjustment axis.