| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a belt from becoming detached from a pulley without increasing cost by disposing a restricting member for preventing the belt from going up outside the belt at a position where the pulley begins engaging with a timing belt. SOLUTION: This device has a pressing roller 35 of a restricting member outside the belt 30 at a position G where a driven pulley 25 begins engaging with a timing belt 30. The pressing roller 35 is rotatably attached to one end of a rotating lever 31 and the rotating lever 31 is rotatably supported by a support shaft 31a and urged by an urging spring 32 to press the pressing roller 35 on the belt 30. A motor of a large size or increased support strength is not necessary for pressing a strong force on the belt 30, thereby preventing the belt 30 from becoming detached from the pulley 25 without increasing cost.</p> |
