Belt unit and image forming apparatus
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United States of America Patent
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Nov 11, 2014
Grant Date -
May 23, 2013
app pub date -
Nov 19, 2012
filing date -
Nov 18, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A belt unit is provided with an endless belt, a driving roller, and a pair of guide ribs. The driving roller is disposed on an inner peripheral surface side of the endless belt and drives the endless belt. The pair of guide ribs is placed on each opposite widthwise end of the inner peripheral surface of the endless belt and contacts both end faces of the driving roller, thus preventing meandering of the endless belt. Additionally, the driving roller is equipped with a low friction region at both opposite lengthwise ends in a predetermined width and the low friction region is configured to have a friction coefficient that is lower than a friction coefficient of a region adjacent to the low friction region.
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