| 摘要 |
PURPOSE:To improve a running property and durability by obliquely forming the end parts in the width direction of each of width-direction position restricting projecting parts provided on the back face of a belt. CONSTITUTION:Width-direction position restricting projecting parts 16, 16 are provided on both end parts in the width direction on the back face of a belt 3 along the circumferential direction. Each projecting part 16 both end parts of which in the width direction are formed in a taper shape forms an engaging part on the inner side in the radial direction of the outer peripheral surface of a driving roller 1 being separably engaged with end faces 1a, 1b. In this structure, when a belt 3 is made run by means of a driving roller 1, if the distance between shafts on the left end part of both rollers 1, 2 is larger than the distance between shafts on the right end part, the projecting part 16 on the left side is separated from the left end faces 1b, 2b of the rollers 1, 2 and rides over the outer peripheral surface, while stopping the movement at the time when both right and left distances between shafts becomes the same. |
