A support assembly including a support rotatably disposed with respect to a frame, a repetition lever hinge mounted to the support, and a repetition lever supported by the repetition lever hinge and rotatably disposed with respect to the support, wherein the repetition lever has a contact surface and the contact surface contacts a hammer shank roller provided to a hammer shank for rotating a hammer, and the repetition lever hinge is mounted to the support in a mounting direction that crosses with a tangent-line direction of a line tangent to the hammer shank roller at the contact between the hammer shank roller and the contact surface.

A support assembly including a support rotatably disposed with respect to a frame, a repetition lever hinge mounted to the support, and a repetition lever supported by the repetition lever hinge and rotatably disposed with respect to the support, wherein the repetition lever has a contact surface and the contact surface contacts a hammer shank roller provided to a hammer shank for rotating a hammer, and the repetition lever hinge is mounted to the support in a mounting direction that crosses with a tangent-line direction of a line tangent to the hammer shank roller at the contact between the hammer shank roller and the contact surface.

A support assembly includes a support rotatably disposed with respect to a frame; a jack support portion connected to the support; a jack having a recessed portion in a lower portion of the jack, the jack having the jack support portion inside the recessed portion and being rotatably disposed to the support; and an acting portion fixed to the jack and receiving a downward action. The recessed portion has an open end with a width larger than a width of the jack support portion. The recessed portion may have an open end with a width larger than a width of the jack support portion.

A support assembly of a keyboard apparatus activated in accordance with pressing of a key to rotate a hammer provided at one end of a hammer shank, the support assembly includes a support rotatably disposed with respect to a frame, a jack having one side rotatably connected to the support and another side including a contact surface which makes contact with a hammer shank roller provided to the hammer shank, and a rib provided to the other side of the jack and projecting to a hammer shank roller side of the contact surface.

A hammer return spring rail (10) for an upright piano including: at least one cavity (15) for receiving at least one rod (20): and a plurality of open compartments (25) each configured to receive a hammer return spring (30). each spring (30) including a coil (35). and each compartment (25) allowing the hammer return spring (30) to extend outward therefrom in a generally downward direction: each compartment (25) including a slot (45) for receiving an extension (40) of each hammer return spring (30); and each compartment including an aperture (50) for receiving an adjusting means (55) such that, by adjusting the degree to which the adjusting means (55) are inserted into the aperture (50). pressure applied to the extension (40) of the spring (30) can be increased or decreased. thereby causing an increase or decrease of the force exerted by the spring (30) on a corresponding hammer butt (60).

A hammer return spring rail (10) for an upright piano including: at least one cavity (15) for receiving at least one rod (20): and a plurality of open compartments (25) each configured to receive a hammer return spring (30). each spring (30) including a coil (35). and each compartment (25) allowing the hammer return spring (30) to extend outward therefrom in a generally downward direction: each compartment (25) including a slot (45) for receiving an extension (40) of each hammer return spring (30); and each compartment including an aperture (50) for receiving an adjusting means (55) such that, by adjusting the degree to which the adjusting means (55) are inserted into the aperture (50). pressure applied to the extension (40) of the spring (30) can be increased or decreased. thereby causing an increase or decrease of the force exerted by the spring (30) on a corresponding hammer butt (60).

A support assembly including a support rotatably disposed with respect to a frame, a repetition lever hinge mounted to the support, and a repetition lever supported by the repetition lever hinge and rotatably disposed with respect to the support, wherein the repetition lever has a contact surface and the contact surface contacts a hammer shank roller provided to a hammer shank for rotating a hammer, and the repetition lever hinge is mounted to the support in a mounting direction that crosses with a tangent-line direction of a line tangent to the hammer shank roller at the contact between the hammer shank roller and the contact surface.

A support assembly includes a support rotatably disposed with respect to a frame; a jack support portion connected to the support; a jack having a recessed portion in a lower portion of the jack, the jack having the jack support portion inside the recessed portion and being rotatably disposed to the support; and an acting portion fixed to the jack and receiving a downward action. The recessed portion has an open end with a width larger than a width of the jack support potion. The recessed portion may have an open end with a width larger than a width of the jack support potion.

A support assembly of a keyboard apparatus activated in accordance with pressing of a key to rotate a hammer provided at one end of a hammer shank, the support assembly includes a support rotatably disposed with respect to a frame, a jack having one side rotatably connected to the support and another side including a contact surface which makes contact with a hammer shank roller provided to the hammer shank, and a rib provided to the other side of the jack and projecting to a hammer shank roller side of the contact surface.

An injection molded wippen or repetition flange bushing for a grand piano action where the bushing has four supports posts or elongated appendages projecting outward from the outer surface of the sleeve member of the injection molded wippen or repetition flange bushing. The four supports posts help reduce or eliminate shrinkage of the sleeve member during the cooling stage in the manufacturing of the injection molded wippen or repetition flange bushing. This occurs because shrinkage occurs in the four support posts and not in the sleeve member portion of the injection molded wippen or repetition flange bushing. The result is a perfectly straight bushing with an extremely precise and accurate bushing surface that produces perfect wippen or repetition rotation.