| 摘要 |
PROBLEM TO BE SOLVED: To prevent an endless belt from getting one-sided with a simple mechanism. SOLUTION: When a driving roller 6 is rotated to rotate the endless belt 1 and the end of the belt 1 runs on a truncated cone roller 12 because the belt 1 is biased, rotational torque acts on the roller 12, which is rotated. By the rotation of the roller 12, a holding string 17 is taken up to the roller 12 and the end of a belt deviation detection roller 9 is displaced in an opposite direction to a spring 20. By such displacement, the belt 1 begins to deviate to an opposite side to the roller 12, the rotational torque of the roller 12 becomes small and the winding force of the string 17 gets weaker and weaker, then the end of the roller 9 is restored toward the spring 20, whereby the deviation of the endless belt is prevented. |
