| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an action of a grand piano in which easily and precisely conduct adjustment of the balance of a lever biasing section of a repetition spring and spring force of a jack biasing section. <P>SOLUTION: The piano is provided with a wippen 3 which is rotated by a pushing up force of a key 2 being pushed, a repetition lever 5 which is turned by the pushed up action of a hammer 14 associated with the turning of the wippen 3, a jack 6 which is mounted on the wippen 3 in a freely rotative manner and pushes up the hammer 14 while the wippen 3 is turned and turns the hammer 14, a repetition spring 7 which is constituted of line materials, extended from fulcrum sections 7a along mutually different directions and has the lever biasing section 7b and the jack biasing section 7c that are respectively provided to bias the lever 5 and the jack 6 along a recovering directions and a disk 31 which is provided on the wippen 3 and supports the sections 7a of the spring 7 at a plurality of positions that are mutually different from each other. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
