Device for engaging, disengaging and advancing the printing unit cylinders

摘要

The invention relates to a device for engaging, disengaging and advancing the printing unit cylinders in offset printing machines, in which the printing unit cylinders are mounted in eccentric bushes which are rotated for the purpose of engaging, disengaging and advancing the printing unit cylinders by means of hydraulic operating cylinders on both sides of the machine. The object of the invention, to reliably guarantee synchronisation of the engaging, disengaging and advancing movements of the impression cylinders on both sides of the machine, is achieved according to the invention in that constantly adjustable directional valves, preferably proportional directional valves, which are controlled by position transducers arranged on the operating cylinders and by a reference value/actual value comparator, are assigned to the operating cylinders connected in parallel via lines. <IMAGE>