Roller that avoids substrate slippage

Abstract

A roller assembly is provided. The roller assembly comprises a groove that includes two opposing surfaces. The roller assembly comprises either frictional surfaces positioned along the groove, or O-ring(s) coupled to the groove. The frictional surfaces may be a plurality of holes at spaced intervals along the opposing surfaces of the groove, a plurality of holes, each hole sized so as to extend into the two opposing surfaces, at spaced intervals along the opposing surfaces of the groove, or may be a bead-blasted surface or a knurled surface positioned along the opposing surfaces of the groove.

1 . A roller adapted to rotate a thin disk, the roller comprising: 
 a groove having a surface adapted to contact an edge of the thin disk; and    at least a first O-ring coupled to the surface.    
   
   
       2 . The apparatus of claim  6  wherein the roller further comprises a second O-ring coupled to the surface such that the edge of the thin disk may be inserted between the first O-ring and the second O-ring.