Abstract: Disclosed is an action for an upright piano capable of expressing rich tone variation and improving the continuous press performance of the same key. In the action (1) for an upright piano, there are formed a guide member (67) fixed to a center rail (14) and continuing in the horizontal direction; and a member to be guided (73) sliding along the guide member (67). A hammer under rail (19) on which a hammer shank (45) abuts is affixed to a hammer rail (18), and butt flanges (41) are affixed to the member to be guided (73). The member to be guided (73) is connected to a pedal (77) via an upthrust bar (81) and a balance (79) such that the member to be guided (73) is slid to the right or left with the force of working the pedal (77) by the player.

Abstract: To provide an action of an upright piano which permits playing of repeated notes on the single key and touch of the keys that are comparable to a grand piano. A first spring (59) is provided to a pushing-up portion (20) of a jack (18), a first spring rest (71) is provided to a jack stop rail (53), and when a jack tail (19) moves away from a regulating button (47), the first spring (59) bent between the pushing-up portion (20) and the first spring rest (71) forces the pushing-up portion (20) to be pushed under a pushed-up portion (27) to be thrust up of a hammer butt (25). A second spring (66) is provided to a damper stop rail (56), a second spring rest (72) is provided to a hammer shank (33), and the second spring (66) bent between the damper stop rail (56) and the second spring rest (72) stops the rotational movement of a hammer (32) before the hammer (32) that moves rotationally by the force of the first spring (59) strikes a string (90).

Abstract: Disclosed is an action for an upright piano capable of expressing rich tone variation and improving the continuous press performance of the same key. In the action (1) for an upright piano, there are formed a guide member (67) fixed to a center rail (14) and continuing in the horizontal direction; and a member to be guided (73) sliding along the guide member (67). A hammer under rail (19) on which a hammer shank (45) abuts is affixed to a hammer rail (18), and butt flanges (41) are affixed to the member to be guided (73). The member to be guided (73) is connected to a pedal (77) via an upthrust bar (81) and a balance (79) such that the member to be guided (73) is slid to the right or left with the force of working the pedal (77) by the player.

Abstract: To provide an action of an upright piano which permits playing of repeated notes on the single key and touch of the keys that are comparable to a grand piano. A first spring (59) is provided to a pushing-up portion (20) of a jack (18), a first spring rest (71) is provided to a jack stop rail (53), and when a jack tail (19) moves away from a regulating button (47), the first spring (59) bent between the pushing-up portion (20) and the first spring rest (71) forces the pushing-up portion (20) to be pushed under a pushed-up portion (27) to be thrust up of a hammer butt (25). A second spring (66) is provided to a damper stop rail (56), a second spring rest (72) is provided to a hammer shank (33), and the second spring (66) bent between the damper stop rail (56) and the second spring rest (72) stops the rotational movement of a hammer (32) before the hammer (32) that moves rotationally by the force of the first spring (59) strikes a string (90).