Patent ID: 9128420
Filing Date: 2015-09-08
Classification: B65G,G03G

Abstract:
1. A belt unit comprising: an endless belt; a driving roller comprising a cylindrical body that is disposed on an inner peripheral surface side of the endless belt and that drives the endless belt; and a pair of guide ribs that is placed on each opposite widthwise end of the inner peripheral surface of the endless belt and that contacts both end faces of the driving roller, thus preventing meandering of the endless belt, wherein the driving roller is equipped with: the adjacent region has a friction coefficient that is higher than a friction coefficient of the low friction region, the cylindrical body of the driving roller is made of the same material as the low friction region, the driving roller is equipped with an uneven level on an outer peripheral surface of the driving roller, the uneven level being placed at each boundary between the adjacent region and the low friction region; and a diameter of the adjacent region is set to be longer than a diameter of the low friction region in such a manner that the uneven level is formed.