ANORDNING FOR DRIFT AV PLATCYLINDERN HOS ROTATIONSTRYCKMASKINER, SERSKILT OFFSETTRYCKMASKINER

摘要

A drive connection between a sleeve on the printing cylinder of a printing press and a hub on the associated driving gear, the hub being freely telescoped over the surface of the sleeve and the sleeve and hub having radially opposed grooves occupied by a key in the form of an entrainer. The entrainer includes two complimentary wedge portions which are mated along a substantially radially extending plane which is arranged at a shallow angle to the cylinder axis. The entrainer presents parallel lateral surfaces which register with the groove in the hub while only one of the wedge portions registers with the groove in the sleeve. Axial adjusting means are provided for captively interconnecting the wedge portions for adjusting the relative axial positions in opposite directions thereby to vary the spacing between the lateral surfaces to achieve a precise sliding fit with respect to the side walls of the groove in the hub thereby to take up any rotational play between the sleeve and the hub while permitting relative axial shifting of the cylinder for the purpose of adjusting the axial register of the printing plate. In a preferred form of the invention roller bearings are interposed between the entrainer and the walls of the groove, with the surfaces which are engaged by the roller bearings being hardened to prevent indentation.