Cylinder ring for preventing end mark of rolled sheet

Abstract

A cylinder ring ( 200, 300, 400 ) which receives a mandrel therein and is made of an elastic material to wind a rolled sheet ( 50 ) around an outer surface of the cylinder ring ( 200, 300, 400 ) in a coiled pattern. The cylinder ring ( 200, 300, 400 ) includes a plurality of elongated protrusions ( 210, 310 ) and a plurality of elongated depressions ( 220 ) which are alternately arranged around the outer surface of the cylinder ring ( 200, 300, 400 ), wherein the elongated protrusions and the elongated depressions are inclined relative to a rotating axis of the cylinder ring ( 200, 300. 400 ) at a predetermined angle, or includes a plurality of embossments ( 410 ) arranged around the outer surface of the cylinder ring ( 200, 300, 400 ) to be spaced apart from each other at regular intervals to prevent end marks from being generated on the rolled sheet ( 50 ) wound around the cylinder ring ( 200, 300, 400 ).

1 . A cylinder ring which receives a mandrel therein and is made of an elastic material to wind a rolled sheet around an outer surface of the cylinder ring in a coiled pattern, the cylinder ring comprising: 
 a plurality of elongated protrusions and a plurality of elongated depressions which are alternately arranged around the outer surface of the cylinder ring, wherein the elongated protrusions and the elongated depressions are inclined relative to a rotating axis of the cylinder ring at a predetermined angle to prevent end marks from being generated on the rolled sheet wound around the cylinder ring.    
   
   
       2 . The cylinder ring of  claim 1 , wherein the angle of inclination of the plurality of elongated protrusions and elongated depressions relative to the rotating axis of the cylinder ring is in a range of 20° to 70°.  
   
   
       3 . The cylinder ring of  claim 1 , further comprising: one or more notches provided on each of the elongated protrusions, the notches being spaced apart from each other at regular intervals.  
   
   
       4 . A cylinder ring which receives a mandrel therein and is made of an elastic material to wind a rolled sheet around an outer surface of the cylinder ring in a coiled pattern, the cylinder ring comprising: 
 a plurality of embossments arranged on the outer surface of the cylinder ring, the embossments being spaced apart from each other at regular intervals to prevent end marks from being generated on the rolled sheet wound around the cylinder ring.    
   
   
       5 . The cylinder ring of  claim 4 , wherein the plurality of embossments are arranged on the outer surface of the cylinder ring along a plurality of lines inclined at a predetermined angle relative to a rotating axis of the cylinder ring.  
   
   
       6 . The cylinder ring of  claim 4 , wherein each of the embossments has a shape of a hemispherical shape, a circular conical shape or an elliptic conical shape.  
   
   
       7 . The cylinder ring of  claim 2 , further comprising: one or more notches provided on each of the elongated protrusions, the notches being spaced apart from each other at regular intervals.  
   
   
       8 . The cylinder ring of  claim 5 , wherein each of the embossments has a shape of a hemispherical shape, a circular conical shape or an elliptic conical shape.