Abrasive finishing devices

Abstract

An abrasive device includes at least two abrasive tracks disposed on a support portion, the abrasive tracks having abrasive surfaces with abrasive elements. The abrasive device may be used to perform various abrasive processes either consecutively or in parallel by means of different abrasive surfaces.

What is claimed is:  
     
         1 . An abrasive device comprising: 
 a support portion; and    a disc portion, wherein the disc portion comprises 
 a first abrasive track having a first abrasive surface, and  
 a second abrasive track having a second abrasive surface,  
   wherein the abrasive surfaces comprise abrasive elements.    
     
     
         2 . The abrasive device of  claim 1 , further comprising a step disposed between the first abrasive track and the second abrasive track.  
     
     
         3 . The abrasive device of  claim 1 , wherein the abrasive surface of at least one abrasive track is cambered or arched.  
     
     
         4 . The abrasive device of  claim 1 , wherein the abrasive elements of each abrasive track comprise different materials.  
     
     
         5 . The abrasive device of  claim 1 , wherein the abrasive elements of each abrasive track define different sizes or shapes.  
     
     
         6 . The abrasive device of  claim 1 , wherein the disc portion comprises a flat or curved surface with a radially inner area on which a first round abrasive track is disposed, and a peripheral area on which a second annular abrasive track is disposed.  
     
     
         7 . The abrasive device of  claim 6 , wherein at least one abrasive surface defines the lateral surface of an inverted cone or inverted truncated cone, having a center point which passes through a center of rotation of the abrasive support portion.  
     
     
         8 . The abrasive device of  claim 1 , wherein the abrasive device is in the form of a circulating band or circulating roller, upon which the abrasive tracks are disposed and are laterally adjacent.  
     
     
         9 . The abrasive device of  claim 1 , wherein the rotating speeds of the abrasive surfaces are modified to match those of the abrasive tracks.  
     
     
         10 . A method for finishing the ends of bristle tuft filaments, comprising: 
 (a) providing a rotating disc including at least two abrasive tracks with abrasive surfaces having different abrasive properties, each abrasive surface comprising corresponding abrasive elements;    (b) contacting an end of a bristle tuft with the first abrasive track to perform a first finishing process; and then (c) contacting the end of the bristle tuft with the second abrasive track to perform a second finishing process.    
     
     
         11 . The method of  claim 10 , wherein the abrasive tracks are disposed at different distances from the rotational center of the disc.