| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a belt unit capable of preventing a guide rib from riding on a drive roller for a prolonged period. <P>SOLUTION: A secondary transfer belt unit 40 comprises a secondary transfer belt 410, a drive roller 420 and a pair of guide ribs 430. The drive roller 420 is disposed in an inner periphery side of the secondary transfer belt 410 and drives the secondary transfer belt 410. The pair of guide ribs 430 is disposed at both end parts in the width direction on the inner periphery surface of the secondary transfer belt and prevents meandering of the secondary transfer belt 410 by contacting with both end surfaces of the drive roller 420. In addition, the drive roller 420 is provided with low friction regions 440 with a predetermined width at both end parts in its longitudinal direction, and friction coefficient of the low friction regions is configured to be smaller than friction coefficient of a region 450 which is adjacent to the low friction regions 440. <P>COPYRIGHT: (C)2013,JPO&INPIT |
