Paper feeding mechanism

Abstract

A paper feeding mechanism includes a base, a driven roller, an active roller, a shaft, and a plurality of torsion elements. The shaft is disposed on the base, and the torsion elements are coaxially connected to the shaft with a first and a second force arm pressing against the rotational axial position of the driven roller and the base respectively. The torsion elements provide a normal force to the driven roller, so that the driven roller may press against the active roller constantly.

1 . A paper feeding mechanism, comprising:
 a base having a driven roller disposed thereon the base and an active roller disposed corresponding to the driven roller, the driven roller pressing against the active roller constantly;   a shaft disposed on the base; and   a plurality of torsion elements coaxially connected to the shaft;   wherein each of the torsion element has a first force arm and a second force arm respectively pressing against the rotational axial position of the driven roller and the base.   
     
     
         2 . The paper feeding mechanism as claimed in  claim 1 , wherein a plurality of clamping portions are disposed on the base corresponding to the torsion elements to be pressed against by the torsion elements. 
     
     
         3 . The paper feeding mechanism as claimed in  claim 1 , wherein the active roller is rolled by a transmission shaft. 
     
     
         4 . The paper feeding mechanism as claimed in  claim 1 , wherein a driven roller shaft is disposed on the base in the rotational axial direction of the driven roller and passes through the driven roller. 
     
     
         5 . The paper feeding mechanism as claimed in  claim 4 , wherein the shaft is parallel to an axial direction of the driven roller shaft. 
     
     
         6 . The paper feeding mechanism as claimed in  claim 1 , wherein the base further comprises a stopper disposed in a limited position adjacent to the driven roller shaft, and when the driven roller press against the active roller, the driven roller only moves to the limited position. 
     
     
         7 . The paper feeding mechanism as claimed in  claim 6 , wherein the retaining element and the base are integrally formed. 
     
     
         8 . The paper feeding mechanism as claimed in  claim 1 , wherein the torsion elements are torsion springs.