Device and method for optically detecting the printing position and / or the register error between the individual colors in multi-color printing in a printing press

摘要

The invention relates to a device and a method for controlling the printing rollers (26) of a printing press, in particular for controlling the device of the printing press and for web regulation to avoid register errors between the individual colors in multi-color printing, with a web (3) to be printed on one long side optical coding, each with a rotation angle sensor (16) assigned to each individual printing roller (26), each with an adjusting device (24) for the separate and independent rotation of each individual printing roller (26), each with each printing roller (26) assigned and the optical coding continuously detecting optical sensor device and with an evaluation unit (18) detecting and processing the sensor signals of the optical sensor devices and the rotation angle sensors (16). DOLLAR A It is provided that the at least one optical sensor device assigned to each printing roller (26) has two different operating modes (I, II), either for device control after inserting a new material web (3) or for register control during printing.