| 摘要 |
PROBLEM TO BE SOLVED: To provide an upright piano type action which gives touch feeling similar to a grand piano, by having clear escaping feeling and high continuous hitting performance at a deep key stroke position.SOLUTION: A surface 60 of a butt 50 has a flat portion 61 which is situated forward and has a small inclination angle and a slanting pressure receiving portion 62 which is situated backward and has a large inclination angle as areas pushed up by a jack 40, and an escapement portion 63 having an obtuse angle is formed. The escapement portion 63 is provided to correspond to a position of the jack placed immediately after the start of swinging. The inclination angle of the slanting pressure receiving portion 62 is determined such that in a stage where a key starts returning from a slow full key stroke, a position at which the butt 50 is in contact with the jack 40 is maintained with the butt 50 swinging backward. |
