| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a key touch feeling which is close to a key touch feeling of an acoustic piano while decreasing the number of components by varying key loads of an upper register and a lower register with a simple structure. <P>SOLUTION: At the extension part 40 of a key 2, 1st and 2nd hammer guide grooves 44 and 45 are provided one over the other in parallel to guide the hammer projection 29b of a hammer arm 3 on an upper register side by the 1st upper hammer guide groove 44 and the hammer projection 29b of a hammer arm 3 on a lower register side by the 2nd lower hammer guide groove 45. The moment of rotation of the key can be made smaller on the upper register side than on the lower register side and the key load can be made lighter on the upper register side than on the lower register side. Consequently, a key touch feeling is obtained which is close to a key touch feeling of an acoustic piano, and the simple structure wherein the 1st and 2nd hammer guide grooves 44 and 45 are formed at the extension part 40 of the key 2 makes components of the key 2, hammer arms, etc., common over the entire register to decrease the number of components. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
