Roller with surface friction

Abstract

A roller is formed on an outer circumferential surface from inner to outer side with a coarsened layer and a finished layer. The coarsened layer is formed by way of subjecting the roller to coarsening, and the finished layer is formed by way of subjecting the roller to a predetermined surface finishing. A plurality of micro sharp points are formed on the finished layer to give the roller with high surface friction, so that the roller is suitable for push feeding sheet material.

1 . A roller with surface friction, comprising a roller having a coarsened layer and a finished layer formed on an outer circumferential surface of said roller from inner to outer side, and a plurality of micro sharp points formed on said finished layer; 
 said coarsened layer being formed on the outer circumferential surface of said roller by subjecting the outer circumferential surface to coarsening;    said finished layer being formed on an outer circumferential surface of said coarsened layer by subjecting said coarsened layer to a predetermined surface finishing; and    said a plurality of micro sharp points formed on said finished layer providing said roller with high surface friction and thereby enabling said roller to effectively push feed sheet material.    
   
   
       2 . The roller with surface friction as claimed in  claim 1 , wherein said finished layer comprises a metal layer formed by metal plating.  
   
   
       3 . The roller with surface friction as claimed in  claim 1 , wherein said micro sharp points are formed on said finished layer by a method selected from the group consisting of etching, engraving, pressing, and scooping.