| 摘要 |
PURPOSE:To prevent an auxiliary plate from being disengaged, by rotating the auxiliary plate and a rotary plate in one body until a specific engagement position of an idler gear and then allowing the auxiliary plate to slide to enter a stopper. CONSTITUTION:When a fast-traversing operation plate 5 slides as shown by an arrow, a sliding surface 5b contacts a tip 61f provided to the auxiliary plate 61, which rotates anticlockwise around the circular reduction hole 40a of the rotary plate 40 as a supporting axis to bring an end surface 61d into contact with a shaft 42 implanted in the rotary plate 40, rotating the rotary plate 40 anticlockwise as well. When the fast-traversing plate 40 further slides, the long-sized hole 61a of the auxiliary plate 61 is guided by the circular reduction hole 40a to slide, entering a bent part 61g into the stopper 17. Consequently, fast-traversing idler gear 29 rotates in a parting direction and rejecting force also operates an shown by an arrow A, so that the engagement is held. |
