| 摘要 |
PURPOSE:To add imitatively a rapidly changing unit as seen in a formerly unrealized key push-pressing curve in order to imitate key touch of an acoustic piano. CONSTITUTION:By constituting a keyboard device in such a way that an escapement lever 13 supported with a key 12 so as to be put in turning motion freely collides with a braking felt 14 arranged under the key and is put in turning motion and increases energizing force of an elastic belt 13b and increases push key force in a position immediately before push key is finished and the tip part 16a of a hammer 15 falls in a step part forming unit 13e of a cam belt 13d formed in the escapement lever 13 and thereby the push key force is decreased in a push key finish position, a rapidly changing unit making use of an escapement mechanism as seen in a key push-pressing curve of an acoustic piano can be added imitatively. |
