| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an action for grand pianos having an improved followability of a wippen or a jack to a key depressing operation by reducing the weight of a jack button screw. <P>SOLUTION: This action including a jack button screw 50 is an action for grand pianos, and in the jack button screw 50, a screw 51 and a button 52 are integrally formed of resin. In a conventional action, a screw part which is configured of metal is heavy, so that the followability to key depression is poor, however, in this action, the screw part which is configured of resin is light so as to improve the followability to the key depression compared with that of the conventional action. <P>COPYRIGHT: (C)2012,JPO&INPIT |
