| 摘要 |
PURPOSE:To improve tuning precision by forming guide holes in a frame, and pressing a channel selecting member in its width direction through supporting shafts formed together with storage pieces in one body by the colliding operation between the storage pieces and slanting edges. CONSTITUTION:When a storage piece 6b collides against a slanting edge 12b, a component V' of force corresponding to pressure V is generated toward the thin width part 1'' of a cross arm and at the same time, the storage piece 6b has counterclockwise angular moment based upon a vertical difference in position between the slanting edge 12b and thin width part 1''. The channel selecting member moves forth in this state and a storage piece 6a is entered into a V-shaped part to stop the lateral movements of the channel selecting member and cam plate 10. Then, the storage piece 6a receives the component V' of force by a guide hole 9a and the supporting shaft 6b'' united with the storage piece 6b presses against the thin width part 1'' to eliminate the gap between the cross arm and frame, receiving the component V' of force by the thin width part 1''. Therefore, the relative distance between the storage pieces 6a and 6b which memorize information on the tuning point is reproduced accurately in the form of the lateral stroke of the cam plate 10. |
