| 摘要 |
PROBLEM TO BE SOLVED: To provide a keyboard device in which a massive body is guided by a simple constitution without using a spring, a stable and good performance is maintained, the generation of mechanical noise and the expansion of the backlush of the bearing portion are prevented by keeping the operating direction of the rotational moment constant against the rotational support section of the body during a key touching and a key releasing and the direct transmission to a key supporting section of the impact force, which is received by the body at the time of falling of the instrument, is prevented so as to prevent the occurrence of a damage. SOLUTION: The device consists of a key 1 which rotates about a rotation supporting section for a playing operation, a massive body 17 which is supported in a freely rotative manner and driven by an abutting section 18 of the key and freely rocks, and supporting members 5 and 6 which support the key in a freely rocking manner and supports the body 1 in a freely rotative manner. A guide member 13 is also provided so that the body 1 is positioned against the key arranged direction at the position separated from a rotational center section 16a and is made freely rotative. |
