| 摘要 |
<p>A grand piano has action units (ACT2) for driving hammers (11b) to rotate toward strings (19b), and each action unit is equipped with a repetition mechanism (40); the repetition mechanism (40) has an elastic guide plate (40B) instead of a repetition lever and a repetition spring; and the elastic guide plate (40B) per se is deformed after contact with a drop screw (34b), and returns to the initial position for permitting a pianist to play a music tune through repetition of key (30b) when the pianist releases the depressed key (30b), whereby the action unit (ACT2) becomes simpler in structure than the conventional action unit.</p> |
