A keyboard device for a keyboard instrument, capable of obtaining excellent touch feeling and stable key stroke without giving sponge feeling or unpleasant vibration during key depression. The keyboard device includes a keyboard chassis, keys pivotally supported on the chassis, hammers swingably supported on the chassis and swinging along with key depression, a hammer upper limit stopper provided on a chassis rear end and contacted by a hammer rear end from below during key depression, and a key lower limit stopper provided on a chassis front end and contacted by front ends of the keys from above during key depression. The hammer upper limit stopper has predetermined flexibility that allows deformation of the hammer upper limit stopper such that after contact of a hammer during key depression, an associated key reaches its lowest position in a state in contact with the key lower limit stopper.

An adjustable action for an electric piano is provided with a keystick having an adjustable bottom capstan at an end thereof opposite the key, which is adjustable so that the rest position of the hammer of each such key may be independently adjusted, and an adjustable top capstan and hammer jack on the top of the keystick, which may be adjusted so that the stop-lock (depressed key) position of the hammer of each such key may be independently adjusted.

An adjustable action for an electric piano is provided with a keystick having an adjustable bottom capstan at an end thereof opposite the key, which is adjustable so that the rest position of the hammer of each such key may be independently adjusted, and an adjustable top capstan and hammer jack on the top of the keystick, which may be adjusted so that the stop-lock (depressed key) position of the hammer of each such key may be independently adjusted.

A keyboard device for a keyboard instrument, capable of largely reducing noise generated when a hammer contacts a lower limit stopper during key release immediately after key depression. The keyboard device includes a keyboard chassis disposed on a keybed, keys pivotally supported on the chassis, hammers pivotally supported on the chassis below the keys and each vertically pivotally moved, an intermediate rail mounted on the chassis below a rotational shaft of the hammers and its vicinity in a state floating from the keybed, and a lower limit stopper mounted on the intermediate rail, such that each hammer is placed thereon via its placement-contact portion when in a key-released state and contacts the same from above via the placement-contact portion when pivotally moving downward in accordance with key release after being moved upward by key depression, whereby further pivotal motion of the hammer is stopped.

A keyboard device for a keyboard instrument, capable of largely reducing noise generated when a hammer contacts a lower limit stopper during key release immediately after key depression. The keyboard device includes a keyboard chassis disposed on a keybed, keys pivotally supported on the chassis, hammers pivotally supported on the chassis below the keys and each vertically pivotally moved, an intermediate rail mounted on the chassis below a rotational shaft of the hammers and its vicinity in a state floating from the keybed, and a lower limit stopper mounted on the intermediate rail, such that each hammer is placed thereon via its placement-contact portion when in a key-released state and contacts the same from above via the placement-contact portion when pivotally moving downward in accordance with key release after being moved upward by key depression, whereby further pivotal motion of the hammer is stopped.

A keyboard device includes white keys, black keys adjacent to the white keys, and guides that are arranged between the white keys and the black keys and restrict operation by coming into contact with the white keys and the black keys. The keyboard device may further include a housing that covers parts of the white keys and the black keys, and the guide may be arranged in the region covered by the housing. The keyboard device may further include caps that are provided between the guides and the white keys and the guides and the black keys, and that have a lower Young's modulus than the guides.

A keyboard device includes white keys, black keys adjacent to the white keys, and guides that are arranged between the white keys and the black keys and restrict operation by coming into contact with the white keys and the black keys. The keyboard device may further include a housing that covers parts of the white keys and the black keys, and the guide may be arranged in the region covered by the housing. The keyboard device may further include caps that are provided between the guides and the white keys and the guides and the black keys, and that have a lower Young's modulus than the guides.

A rotation mechanism includes a shaft portion, a bearing portion, a protruding portion, and a stopper. The bearing portion configured to rotate with respect to a predetermined axis as a center of rotation and configured to slide relative to an outer periphery of the shaft portion. The protruding portion protrudes from the shaft portion. The stopper is integrally formed the bearing portion. The stopper faces the protruding portion. A length of the protruding portion in a direction in which the protruding portion protrudes is larger than a distance from the center of rotation to a sliding portion where the bearing portion slides relative to the outer periphery of the shaft portion.

A rotation mechanism includes a shaft portion, a bearing portion, a protruding portion, and a stopper. The bearing portion configured to rotate with respect to a predetermined axis as a center of rotation and configured to slide relative to an outer periphery of the shaft portion. The protruding portion protrudes from the shaft portion. The stopper is integrally formed the bearing portion. The stopper faces the protruding portion. A length of the protruding portion in a direction in which the protruding portion protrudes is larger than a distance from the center of rotation to a sliding portion where the bearing portion slides relative to the outer periphery of the shaft portion.

A stopper rail of a silent piano, which can make collision noise generated when a hammer shank collides against the stopper rail, blurred in the sense of pitch thereof and difficult to be recognized by the human ear, in a silent performance mode. In this mode, the stopper rail is contacted by the hammer shank of a hammer being pivotally moved to stop pivotal movement of the hammer. The stopper rail includes a rail body having a predetermined flexural rigidity allowing vibration, a first cushion provided on one surface of the hammer shank, for being contacted by the hammer shank being pivotally moved, and a vibration suppressing portion provided on an opposite surface of: the rail body to the first surface so as to apply a load to the rail body to suppress vibration of the rail body when the hammer shank contacts the rail body.