| 摘要 |
PROBLEM TO BE SOLVED: To suppress generation of inconvenience to be generated in association with eventual occurrence of abnormality in the relationship of the running position and direction of an endless belt with respect to an idler pulley, by displacing the idler pulley. SOLUTION: On a support sleeve 10a a collar 28c is fitted with possibility of displacement in the axial direction, and an inner ring 12a is fitted on the collar 28c in such a way as capable of displacement in swinging oscillatively. If the running position of an endless belt is abnormal, the collar 28c makes displacement in the axial direction to compensate the abnormal portion. If the running direction is abnormal, the inner ring 12a swings to compensate the abnormal portion. |
