Abstract: A friction winding shaft has a shaft body (12) and a plurality of friction rings (14), which can be driven in slaved fashion by the shaft body. By means of the friction rings (14), bushes (24) for winding operations can be driven in slaved fashion, and between the shaft body (2) and the friction elements (14), radially movable friction elements (28) are provided, which can be pressed by means of positioning elements (30) against inner circumferential surfaces (32) of the friction rings (14). In order to achieve the least possible fluctuations in the frictional moment between the shaft body and the friction ring, it is proposed that between the shaft body (12) and the friction rings (14), an air gap (34) is provided, and on the outer face of the shaft body (12), at least two slide elements (36) are provided, which rest on inner surfaces (32) of the friction rings (14).

Abstract: The friction winding shaft is used to wind up materials in strip form onto coil cores (16). It comprises a core shaft (20) annularly surrounded by friction elements (12), as well as radially acting tension elements (24), which in the operating position bring about a frictional engagement between the coupling elements (28) slaved by the core shaft (20) and the friction elements (12), by means of which engagement torque can be transmitted with slip from the core shaft (20) to the friction elements (12). The friction elements (12) are movable outward in order in operation to establish a rotationally fixed connection between the friction elements (12) and the coil core (16). With the goal of assuring slip-free slaving of the coil core at a certain torque, it is proposed that the tension elements (24), by means of the radial forces they impose, move the friction elements (12) radially outward via the coupling elements (28) and put them in contact with the coil core.