Device for tensionally connecting a fixed gearwheel and an adjustable gearwheel on a cylinder of a turning apparatus in a sheet-fed rotary printing press and, more particularly, to such a device which is electrically safeguarded

In a sheet-fed rotary printing press, a device for tensionally connected a fixed gearwheel and a gearwheel coaxial with and adjustable in rotational position thereof relative to the fixed gearwheel, comprising an actuatable clamping element and a clamping body for clamping the fixed gearwheel and the adjustable gearwheel together, said clamping element being disposed substantially centrally on said clamping body, said clamping body being braced against one of the gearwheels, and being held with said clamping element on the other of the gearwheels, friction elements carried by the gearwheels as to be mutually overlappingly interengaging in the manner of a multidrive clutch, said clamping body having an annular pressure member radially spaced from said substantially centrally disposed clamping element for bracing said clamping body against the one gearwheel through the intermediary of said friction elements in an overlap region of said friction elements.