Sheet feed roll

Abstract

A sheet feed roll having a concavity and a convexity formed on an outer peripheral surface thereof, an irregular portion composed of the concavity and the convexity being of a corrugated cross-sectional shape, and the concavity extending along the axial direction of the roll.

1 . A sheet feed roll having a concavity and a convexity formed on an outer peripheral surface thereof, an irregular portion composed of said concavity and said convexity being of a corrugated cross-sectional shape, and said concavity extending along an axial direction of said roll.  
   
   
       2 . The sheet feed roll according to  claim 1 , wherein a width of said concavity is 500 μm or less.  
   
   
       3 . The sheet feed roll according to  claim 1 , wherein a width of said convexity is 500 μm or less.  
   
   
       4 . The sheet feed roll according to  claim 1 , wherein a width of said concavity is 500 μm or less, and a width of said convexity is 500 μm or less.  
   
   
       5 . The sheet feed roll according to  claim 1 , wherein when the outer peripheral surface of said roll is partitioned by a lattice of cells 1 mm square each, one or more of said convexities and one or more of said concavities are present in each of said cells.  
   
   
       6 . The sheet feed roll according to  claim 1 , wherein a height of said convexity is 50 to 150 μm.  
   
   
       7 . The sheet feed roll according to  claim 1 , comprising polyurethane having a hardness of 25 to 50° (JIS A), and rebound resilience of 50 to 80%.  
   
   
       8 . The sheet feed roll according to  claim 1 , having Rz of 40 to 120 μm.  
   
   
       9 . The sheet feed roll according to  claim 1 , wherein a length in the axial direction of said concavity is two times or more a length in a circumferential direction of said concavity.  
   
   
       10 . The sheet feed roll according to  claim 1 , wherein a length in the axial direction of said convexity is two times or more a length in a circumferential direction of said convexity.  
   
   
       11 . The sheet feed roll according to  claim 1 , wherein outer peripheral corners in opposite end portions in a longitudinal direction of said sheet feed roll have C-surfaces or R-surfaces.  
   
   
       12 . A sheet feed roll comprising polyurethane having a hardness of 25 to 50° (JIS A), and rebound resilience of 50 to 80%, and said sheet feed roll having a concavity and a convexity formed on an outer peripheral surface thereof, an irregular portion composed of said concavity and said convexity being of a corrugated cross-sectional shape, and wherein said concavity extends along an axial direction of said roll, a width of said concavity is 500 μm or less, a width of said convexity is 500 μm or less, a height of said convexity is 50 to 150 μm, and Rz of said sheet feed roll is 40 to 120 μm.