| 摘要 |
PURPOSE:To prevent the deformation or damage of a crown rod, by providing a stopper restricting forward progress of an arm metal with a frame. CONSTITUTION:A projection 20 is formed to an arm metal 2 of a push button 3 and a stopper 21 is formed at a lower ridge of a rear frame 12 of a push button tuner. The stopper 21 is formed to be tensioned to side plate levers, left and right and has the curved shape corresponding to the amount of deflection of a crank rod 5. The position of the front end contact part of the stopper 21 is set so that the clearance A between the projection 20 of the arm metal 2 and the front contact part of the stopper 21 is smaller than the elastic limit deflection B of the crown rod 5, when angle adjusting plate 11 is contacted with the crown rod through the protruded arm 22. |
