| 摘要 |
PURPOSE:To automatically adjust the tension on a belt and restrain backlash, by providing a timing belt and a driving wire with appropriate tensions by a spring provided for a guide pulley, and biasing a driving pulley to a pulley on the prime mover side through the tensions. CONSTITUTION:A guide pulley 5 is constantly biased in the direction of an arrow D by the fore of a coil spring 16. Therefore, an appropriate tension is provided on a timing belt by the biasing force, and a driving pulley 4 and a driving gear 6 are also biased in the direction of the arrow D through the timing belt 3, whereby the driving gear 6 is engaged, under pressure, with a gear 8 on the motor side. By this, a play due to backlash between the driving gear 6 and the gear 8 is restrained. In addition, since the timing belt 3 is also provided with an appropriate tension, slipping between the pulleys 4 and 5 is also restrained. |
