| 摘要 |
PURPOSE:To link a tuning shaft with a core driving shaft regardless of the position of the tuning shaft, by forming a gear and the like incorporatedly at the outer circumference of a discoidaly Oldham forming an Oldham's coupling. CONSTITUTION:A like gear 3 for a tuning shaft is formed incorporatedly on an outer cirucimference of a discoidal Oldham 2. When a fixed position of the tuning shaft 7 is within a permissible range of the Oldham 2, and Oldham's coupling 8 is provided at the tip of the tuning shaft 7 to link the shaft 7 and the Oldham 2. On the other hand, if the position of the tuning shaft 7 is outside of the permissible range, a gear 9 is provided to the tip of the tuning shaft 7 and the gear 9 is meshed with a link gear 3. Thus, the tuning shaft can be linked directly to the core driving shaft regardless of the position of the tuning shaft. The same effect can be attained by providing a sprocket in place of the link gear 3. |
