| 摘要 |
PURPOSE:To simplify the construction and reduce the number of component parts to facilitate assembly, by a method wherein a pressing cam and an engaging member are rotatably mounted on a side frame and a follower pulley is energized in the direction where a deflection alleviating member is mounted. CONSTITUTION:A pressing cam 34 having a cam face 36 and an engaging member 27 are rotatably mounted on a side frame 14. At the outside of the side frame 14, the engaging member 27 supporting a pulley shaft 33 is energized in the direction where a deflection alleviating member is mounted by being pressed by the pressing cam 34. Then, the pressing cam 34 is engaged with the energized engaging member 27 at the cam face thereof 36 to be held. In this manner, the tension of the deflection alleviating member can be constantly maintained, which realizes reduction of the number of the component parts to enhance the assembly property. |
