| 摘要 |
<p>PURPOSE:To realize a thin type of the whole body of the device and to reduce the number of parts by providing a hammer arm rotatable in the up and down direction in an internal space at the front end of a key, and utilizing a space formed at the rear and lower side of a keyboard chassis as a dry cell housing. CONSTITUTION:A hammer arm 41 is provided rotatable in the internal space of a key 11 between the front plate 19 of the key 11 and a stopper piece 21. Even though a dry cell housing 5 is composed by a part of the space of a certain width formed at the lower side of the rear chassis 3 of a keyboard chassis 1, the housing 5 and the arm 4 are not superposed, and the whole body of the musical instrument can be made in a thin type. Furthermore, both shafts 42 of the arm 41 are installed to the recesses for bearing formed at a specific position where the inner surfaces are opposed each other at the front end of the side plate 18 of the key 11, by pressing in from the lower side of the key 11. Consequently, an exclusive shaft to hold the arm 41 rotatable and the like are unnecessary, and the number of parts is reduced as much.</p> |
