Friction winding shaft

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 ).

1 . A friction winding shaft, having a shaft body and a plurality of friction rings, which are drivable in slaved fashion in friction-locking fashion by the shaft body, and by means of the friction rings, bushes for winding operations can be driven in slaved fashion, and between the shaft body and the friction rings, radially movable friction elements are provided, which can be pressed by means of positioning elements ( 30 ) against inner circumferential surfaces of the friction rings, wherein between the shaft body and the friction rings, an air gap is provided, and on the outer face of the shaft body, at least two slide elements are provided, which rest on inner surfaces of the friction rings. 
     
     
         2 . The friction winding shaft of  claim 1 , wherein the slide elements are of plastic. 
     
     
         3 . The friction winding shaft of  claim 1 , wherein the slide elements ( 36 ;  136 ;  236 ;  336 ) slide dry on the inner surfaces ( 32 ) of the friction rings ( 14 ). 
     
     
         4 . The friction winding shaft of one of  claim 1 , wherein the slide elements are disposed on the circumference between the rubbing elements. 
     
     
         5 . The friction winding shaft of  claim 4 , wherein two or more slide elements each are disposed between the friction elements in spaced-apart fashion. 
     
     
         6 . The friction winding shaft of one of  claim 1 , wherein three or six slide elements are provided. 
     
     
         7 . The friction winding shaft of  claim 5 , wherein the U-shaped sliding bodies are provided, and the rubbing and positioning elements are disposed between legs of the sliding bodies, and the ends of the legs of the sliding bodies form the slide elements. 
     
     
         8 . The friction winding shaft of one of  claim 1 , wherein the slide elements and the friction elements are embodied in one piece and are disposed in axial grooves in the shaft body that form shoulders, which in the retracted position ensure contact with the friction rings. 
     
     
         9 . The friction winding shaft of  claim 8 , wherein only some of the combined slide/friction elements are provided with a positioning element.