| 摘要 |
PROBLEM TO BE SOLVED: To prevent a pulley from conducting idle rotation at the time of adjusting tension, and adjust the tension easily. SOLUTION: A tension adjusting pulley 61 is supported so as to slide on a straight line L1 connecting the centers M of pulleys 48, 49 to each other, inside a frictional transmission belt 50. The diameter of the pulley 61 is set so as to be equal to that of the pulley having a larger diameter of the two pulleys 48, 49. |
