| 摘要 |
PROBLEM TO BE SOLVED: To suppress the deformation of an endless belt and to suppress the deviation in the width direction of the endless belt, while simplifying an apparatus.SOLUTION: A belt driving apparatus includes a driving roller 2 and a stretching roller 3 and rotationally drives an endless blet 4 stretched between the driving roller 2 and the stretching roller 3. On the outer periphery of the driving roller 2, a high friction part 21 whose frictional coefficient with the rear surface of the endless blet is a first value and a low friction part 22 whose frictional coefficient with rear surface of the endless belt is a second value smaller than the first value are formed. A boundary line 23 between the high friction part 21 and the low friction part 22 goes from the central side in the rotation axis direction of the driving roller 2 to the end side as going from the upstream side in the rotational direction of the driving roller 2 to the downstream side.SELECTED DRAWING: Figure 2 |
