| 摘要 |
PROBLEM TO BE SOLVED: To provide a keyboard device which facilitates assembling and removing work of a massive body while assuring the dislodgment-free turning of the massive body with simple constitution. SOLUTION: The attachment and detachment of the massive body 40 to and from a supporting member 20 are carried out in a posture of a turning angle at which an abutment part 44 parts from a stopper 22 for the massive body in a turning direction as compared to a turning start position. An aperture Ra of a segmental circle R of a bearing section 45 is disposed to face downward and the massive body 40 is lowered from above toward a turning shaft part 32 so that projecting parts 32L and 32R pass the aperture Ra. When a key 1 and a key frame 10 are assembled, the massive body 40 is confined in the turning start position. The massive body 40 attains a turnable state cooperatively with key touch operation only within the corresponding turning angle within a key touch operation range from the turning start position to a turning end position (the position where the abutment part 44 abuts on the stopper 22). The projecting parts 32L and 32R are not removed from the segmental circle R of the bearing section 45 and the massive body 40 is not dislodged from the supporting member 20 within the key touch operation range. |
