SHEET GUIDING DRUM FOR A PRINTING MACHINE CONVERTIBLE FROM FIRST FORM TO PERFECTOR PRINTING

摘要

Sheet-guiding drum for a printing machine convertible from first form to perfector printing and in reverse, including at least two sheet-guiding surfaces formed at a circumference of segments of an outer drum part which are adjustable in circumferential direction with respect to an axial support member for journalling the sheet-guiding drum, and a clamping device for locking together the segments of the outer drum part and the journalling axial support member, the clamping device having radially directed friction surfaces disposed on the segments of the outer drum part and on the journalling axial support member and being pressable with a clamping force against one another in axial direction, and a tension rod movable in axial direction of the journalling axial support member for pressing the friction surfaces on the segments and on the journalling member against one another, includes lamellar, interengaging friction elements alternately connected to one of the segments of the outer drum part and to the journalling axial support member so as to be fixed against rotation relative thereto, said friction elements being disposed between two counter bearings supported on the journalling axial support member, and a movable clamping lever in the form of a rocker arm disposed transversely to the axial direction of the clamping force, said clamping lever having an end thereof spring-loaded in the axial direction of the clamping force via the tension rod, the rod being secured against rotation.