| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a plurality of stopper parts from behaving individually and irregularly even against a number of impact shocks and improve durability thereof. <P>SOLUTION: An upper side stopper body ST2 provided at the underside of a rear part 4d of a keyboard chassis comprises a front side stopper part 10 and a rear side stopper part 20 arranged along the longitudinal direction of a hammer. In the forward stroke of turn of the hammer, the turn end position of the hammer is regulated by cooperation of the stopper parts 10, 20. The modulus of longitudinal elasticity is the highest at the front side stopper part 10, while the lowest at a third layer 23, the lowest layer of the rear side stopper part 20. The front side stopper part 10 and the rear side stopper part 20 are secured on the underside of the rear part 4d of the keyboard chassis by a base part 25, an integrally formed wedge-shaped profile common layer 28 is provided on the underside of the third layer 23 and the underside of the front side stopper part 10, and the front side stopper part 10 and the rear side stopper part 20 are firmly and integrally connected together by the base part 25 and the common layer 28. <P>COPYRIGHT: (C)2012,JPO&INPIT |
