| 摘要 |
<p>An upright piano (1) includes action units (ACT) between keys (10B, 10W) and hammers (40), and the action units (ACT) are less prompt so that a missing tone tends to take place in a music passage through high-speed repetition; the action unit (ACT) is constructed from a whippen assembly (21), a jack mechanism (26) provided on the whippen assembly (21) and a regulating button mechanism (32) for an escape in cooperation with the jack mechanism (26), and a compression coil spring (17a) is provided between a center rail (16a) and the whippen assembly (21) for urging the whippen assembly (21) in a direction toward the original position, thereby accelerating the restoration of jack (26a) to the contact with the hammer (40).</p> |
