| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent a stopper and a damper from abutting against each other during a musical performance by arranging the stopper with a proper gap to the damper. SOLUTION: In a normal musical performance state wherein a lever 66 is rotated clockwise about 90 deg., a driving shaft 65 is moved in the horizontal direction crossing the side of a stopper shaft 74 at right angles or in its opposite direction. Consequently, the stopper 60 rotates in the direction separating away from or coming close to the damper. Then, the driving shaft 65 is moved until the proper gap is formed between the stopper 60 and damper.</p> |
