Belt device

Abstract

Pulleys 29 a, 29 b are provided on both ends of the driven roller 28 as separate components from the driven roller 28 , and on both edges in the width direction of the transfer belt 24 , ribs 24 a, 24 b that can be engaged with the outer sides in the axial direction of the pulleys 29 a, 29 b are provided. If the transfer belt 24 becomes inclined to the left side during movement, the rib 24 a on the right edge of the transfer belt 24 will be restricted by the outer side in the axial direction of the pulley 29 a provided on the right side end of the driven roller 28 , thereby correcting meandering to the left at the position of the driven roller 28.

1. A belt device comprising:
 a driving roller driven by a drive unit; 
 a driven roller disposed so as to face the driving roller; 
 pulleys disposed on both ends of the driven roller so as to freely rotate freely, coaxially, and relatively with respect to the driven roller, each pulley having a substantially flat an outer circumferential surface having a substantially constant radius, each pulley formed separately from the driven roller; and 
 a belt stretched between around the driving roller and driven roller, the belt comprising a plurality of ribs arranged on the edges thereof;, 
 wherein the inner lateral surfaces of the ribs are being disposed between 0 and 1 mm from the outermost ends of the pulleys in the axial direction, meandering of the belt being corrected when one of the ribs moves laterally and contacts one of the pulleys in an axial direction. 
 
     
     
       2. A belt device according to  claim 1 , wherein at least the center diameter of the driven roller is larger than the diameter of both ends of the driven roller in the roller axial direction. 
     
     
       3. A belt device comprising:
 a driving roller driven by a drive unit;   a driven roller disposed so as to face the driving roller;   pulleys disposed on both ends of the driven roller so as to rotate freely, coaxially, and relatively with respect to the driven roller, each pulley formed separately from the driven roller and being devoid of grooves; and   a belt stretched around the driving roller and driven roller, the belt having ribs being formed on the edges of both sides of the belt, the ribs being configured to engage with the outside of the pulleys in the axial direction to correct belt meandering, meandering of the belt being corrected when one of the ribs moves laterally and contacts one of the pulleys in an axial direction, the inner lateral surfaces of the ribs being disposed between 0 and 1 mm from outermost ends of the pulleys in the axial direction.   
     
     
       4. A belt device according to claim 2, wherein
 the ribs are configured to engage with the outermost ends to correct belt meandering.   
     
     
       5. A belt device according to claim 1, wherein
 the ribs are configured to engage with the outermost ends to correct belt meandering.