Mechanism for lifting and lowering an impression cylinder with spring-biased multiple disc brake locking device

Apparatus for applying and withdrawing pressure and, as is necessary for cylinder replacement, causing a wide stroke to be executed by an impression cylinder which acts on the plate cylinder of a rotogravure press and of which the two journal bearings are each connected to a double acting pressure cylinder for lifting and lowering the impression cylinder and are interconnected by a synchronising shaft which is mounted thereon and is provided with pinions engaging racks fixed with respect to the frame, characterised in that the synchronising shaft (17) can, for the purpose of blocking, be coupled to the journal bearings (4, 5) by at least one spring-biassed multiple disc brake (25), and that the brake (25) is released during execution of the wide stroke and during pressure application of the impression cylinder (1) and is actuatable for engagement at the end of the short-stroke pressure withdrawal.