| 摘要 |
<p>PROBLEM TO BE SOLVED: To fit, to a keyboard instrument part of whose keyboard is positioned above a leg beam, a key drive device for driving the keys without cutting and removing part of the leg beam.SOLUTION: A key drive device 10 is split into two drive units 10-L and 10-U; when a grand piano is to be fitted with the key drive device 10, in each of the drive units 10-L and 10-U, a solenoid housing 100b is inserted into a space 30b above a leg beam 4 configured in conjunction with a shelf plate 3; on the other hand, a solenoid housing 100a having in its lower part a substrate housing 200a in which a substrate for controlling actions of solenoids is inserted into a space 30a, different from the space 30b configured on the shelf plate 3.</p> |
