| 摘要 |
PURPOSE:To ensure a simple construction, enable the tension on a motive power transmitting means to be secured to a fixed value and make it possible to eliminate the need for a tension-adjusting operation, by turnably fitting a motive power generating part to a frame, and energizing the motive power generating part in the direction for applying a tension on the motive power transmitting means by an elastic means fastened to the motive power generating means. CONSTITUTION:A driving pulley shaft 9 is fixed to a motor 7 perpendicularly to an upper face (in the figure) of the motor 7, and a driving pulley 8 is rotatably supported by the shaft 9 through a bearing 15. A belt 8 is fitted to a driven pulley 13 and the driving pulley 8, and the motor 7 is rotated in the direction of an arrow 21 with a projection 7-c as a center by s tension spring 10, and a fixed tension corresponding to the spring force and the displacement of the spring 10 is exerted on the belt 12. A pinion 11 fixed to an output shaft of the motor 7 is engaged with the driving pulley 8 to transmit the driving force of the motor 7. The pinion 11, the driving pulley 8, the bearing 15 and the like constitute a mechanism for transmitting the motive power from the motor shaft 9 to the belt. |
