| 摘要 |
PROBLEM TO BE SOLVED: To suppress inhibition of the original function of a tensile force application stretch member even when an attitude of a tilting stretch member is changed.SOLUTION: A belt driving device includes: tensile force application means for urging a steering tension roller 215 toward a belt portion that is in contact with the steering tension roller 215, while supporting the steering tension roller 215 displaceably in a direction to advance and retreat to the belt portion; and a deviation correction actuator 216 and skew correction actuator 217 that change relative attitudes of a steering roller 214 and the steering tension roller 215 to the belt portions that are in contact with respective rollers. The friction coefficient between the steering roller 214 and a belt 200 is made smaller than the friction coefficient between two rollers 213 and 215 adjacent to the steering roller 214 and the belt. |
