Magnetic paper-feeding roller assembly

Abstract

A magnetic paper-feeding roller assembly is adapted to feed a piece of paper in a machine that requires paper-feeding and that includes a casing. The magnetic paper-feeding roller assembly includes a first roller and a second roller, both of which are adapted to be pivotably mounted in the casing. The first roller is made of a magnetically attractive material. The second roller produces a magnetic force to magnetically attract the first roller toward the second roller so as to maintain a predetermined gap between the first roller and the second roller.

1 . A magnetic paper-feeding roller assembly adapted to feed a piece of paper in a machine that requires paper-feeding, the machine including a casing, said magnetic paper-feeding roller assembly comprising:
 a first roller adapted to be pivotably mounted in the casing, said first roller being made of a magnetically attractive material; and   a second roller adapted to be pivotably mounted in the casing, and producing a magnetic force to magnetically attract said first roller toward said second roller so as to maintain a predetermined gap between said first roller and said second roller.   
   
   
       2 . The magnetic paper-feeding roller assembly as claimed in  claim 1 , wherein said second roller has a peripheral surface, and includes an anti-slip layer disposed on said peripheral surface. 
   
   
       3 . The magnetic paper-feeding roller assembly as claimed in  claim 2 , wherein said second roller further includes a nonmagnetic tube having said peripheral surface, and at least one magnetic unit disposed in said tube. 
   
   
       4 . The magnetic paper-feeding roller assembly as claimed in  claim 3 , wherein said tube has opposite ends, and a pair of said magnetic units are disposed in said tube proximate respectively to said ends of said tube. 
   
   
       5 . The magnetic paper-feeding roller assembly as claimed in  claim 4 , wherein said magnetic units are disposed in said tube in such a manner that like magnetic poles of said magnetic units face each other. 
   
   
       6 . The magnetic paper-feeding roller assembly as claimed in  claim 3 , wherein said tube of said second roller is made of a nonmagnetic stainless steel material. 
   
   
       7 . The magnetic paper-feeding roller assembly as claimed in  claim 3 , wherein said second roller further includes two caps that cover respectively said ends of said tube. 
   
   
       8 . The magnetic paper-feeding roller assembly as claimed in  claim 1 , wherein said first roller is made of a magnetically attractive stainless steel material.