| 摘要 |
<p>PROBLEM TO BE SOLVED: To obviate the occurrence of a key pad of a non-working state during playing by adopting the constitution to forcibly part a normally open key pad from the seat part of a tone hole via an arm when the control lever of the normally open key pad is pressed. SOLUTION: When the control lever of the normally open key pad is pressed, the normally open key pad is forcibly parted from the seat part of the tone hole via the arm. If, for example, the control lever L1 for G# is pushed down by the fingertip from the state of producing, for example, a G tone, a projecting lever 25 moves upward and the one 24a of the arm 24 is moved upward around a fulcrum S by the upward movement of the projecting lever 25. The other 24b of the arm 24 is, however, placed on the working lever M4 existing in an upper position and, therefore, the arm 24 turns around the contact part T of the other 24b of the arm 24 and the working lever M4 an parts the G# key pad accompanied by a strut 23 from the seat part Oa of the tone hole O, thereby opening the torn hole.</p> |
