| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for improving repeated hitting performance of a piano. <P>SOLUTION: A jack 18 used for an action mechanism of a piano is formed approximately like a letter L consisting of a big jack part 18a and a small jack part 18b, and especially, the large jack part 18a is smaller than the small jack part 18b in thickness in the row direction of the keys in a state in which the jack 10 is attached to the piano. Moreover, compared with the thickness of a small jack part 10b of a conventional jack 10, the thickness of the small jack 18b is smaller and further the width is also smaller. Thus, the jack 18 is reduced in weight but especially the small jack part 18b is reduced in weight. From the above, in the case that the jack 18 is attached to the action mechanism, a time required until the jack 18 returns from the state of having finished thrusting up a part of a struck string member up to the position permitting to thrust it again can be shortened. Therefore, more hits can be repeated within a certain period of time. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
