Patent ID: 8525007

Claim:
A method of operating an action of an upright piano having strings, the action comprising a regulating rail, a jack stop rail, a main action rail, a damper stop rail, a wippen, a jack, a hammer butt, and a hammer, the action further comprising a jack spring between the wippen and a jack tail of the jack, the action being adapted to operate, when a piano player depresses a key, in such a manner that the wippen moves up with rotating, a protruding end of a pushing-up portion of the jack pushes up a pushed-up portion of the hammer butt from below, the hammer pivots and hits a corresponding string, the jack tail of the jack strikes a regulating button, and that a protruding end of the pushing-up portion slips out from under the pushed-up portion, wherein either one member of said regulating rail and said jack stop rail serves as a first rail; either one member of said first rail and said pushing-up portion has a first spring; the other member of said first rail and said pushing-up portion that does not have said first spring has a first spring rest adapted to come into contact with said first spring; either one member of said main action rail and said damper stop rail serves as a second rail; one member of said second rail, a hammer core of said hammer, a hammer shank of said hammer, and said hammer butt has a second spring; if one member of said hammer core, said hammer shank, and said hammer butt has said second spring, then said second rail has a second spring rest adapted to come into contact with said second spring, and if said second rail has said second spring, then one member of said hammer core, said hammer shank, and said hammer butt has the second spring rest adapted to come into contact with said second spring; when the piano player depresses said key and the protruding end of said pushing-up portion slips out from under said pushed-up portion, said first spring is bent between the member having said first spring and said first spring rest, and when the piano player releases said key, said wippen moves down with rotating, and said jack tail escapes from said regulating button, said first spring that has been bent between the member having said first spring and said first spring rest pushes the protruding end of said pushing-up portion against a surface that is located in front of and above said pushed-up portion of said hammer butt, and said pushing-up portion is inserted under said pushed-up portion; when said first spring forces said pushing-up portion under said pushed-up portion, said hammer pivots towards said string by a force applied from said pushing-up portion to said pushed-up portion, said second spring is bent between the member having said second spring and said second spring rest before the rotation hammer hits said string, said second spring that has been bent applies a force to said hammer, the force applied from said second spring that has been bent to said hammer stops the pivot motion of said hammer before pivoting hammer hits said string.