Abstract: A keyboard device for an electronic keyboard instrument, making uniform an upper surface height of the rear end of each key in contact with a hammer in a key-released state. The keyboard device includes longitudinally extending wooden keys capable of swinging and laterally juxtaposed, a hammer support disposed rearward of the keys, longitudinally extending hammers having a rear end thereof supported by the hammer support vertically pivotally movably and a protrusion protruding downward from a lower surface thereof for contact with a rear end of an associated key, and hammer contact height-regulating parts each made of a synthetic resin and mounted on the rear end of each key, the part being in contact with the protrusion in the key-released state, to regulate a contact height of the protrusion to a predetermined height.

Abstract: A keyboard device for an electronic keyboard instrument, making uniform an upper surface height of the rear end of each key in contact with a hammer in a key-released state. The keyboard device includes longitudinally extending wooden keys capable of swinging and laterally juxtaposed, a hammer support disposed rearward of the keys, longitudinally extending hammers having a rear end thereof supported by the hammer support vertically pivotally movably and a protrusion protruding downward from a lower surface thereof for contact with a rear end of an associated key, and hammer contact height-regulating parts each made of a synthetic resin and mounted on the rear end of each key, the part being in contact with the protrusion in the key-released state, to regulate a contact height of the protrusion to a predetermined height.

Abstract: A musical tone control system for an electronic keyboard instrument, which is capable of calculating a key depression velocity of a key with high accuracy without being adversely affected by a large rotational resistance of the key during a let-off, and stopping sounding of a musical tone in appropriate timing. The system detects first key depression information on a key at a first position corresponding to a key depression depth obtained before start of a let-off, second key depression information on the key at a second position which corresponds to a larger key depression depth than the first position does, and third key depression information, obtained after termination of the let-off, on the key at a third position which corresponds to a larger key depression depth than the second position does. The tone volume of a musical tone is set based on a key depression velocity of the key.

Abstract: A keyboard device for an electronic keyboard instrument, ensuring stable pivotal motion of each key and improved in each of assembly and disassembly. Each key extends in a front-rear direction and has a pivot shaft extending at a rear end in a left-right direction. A keyboard chassis has a mounting portion and key-separating support portions each for supporting the pivot shaft. A pivot shaft bearing member has a pivot shaft support portion cooperating with each key-separating support portion to form a bearing for the pivot shaft, supporting each key pivotally movable, and is removably mounted to the mounting portion. During assembly, with each key engaged with the key-separating support portion via the pivot shaft and held on the keyboard chassis, the mounting portion remains exposed, enabling the bearing member to be mounted from above or rear.

Abstract: A hammer for an electronic keyboard instrument, constructed to ensure secure mounting of a weight to a hammer body and enable both assembly and disassembly of the hammer to be easily performed. The hammer includes a hammer body having a weight mounting portion that is open on one side in a left-right direction and a weight removably mounted to the hammer body via a mounting portion. The weight mounting portion has a housing portion that has an opening having a shape complementary to the mounting portion, and houses the mounting portion in a manner slidable between a fit-in position and a fixed position, latching portions for latching the mounting portion incapable of falling off from the opening when in the fixed position, and holding portions for holding the mounting portion non-slidable to the fit-in position.

Abstract: There is provided a musical tone control system for an electronic keyboard instrument, which is capable of calculating a key depression velocity of a key with high accuracy without being adversely affected by a large rotational resistance of the key during a let-off, and stopping sounding of a musical tone in appropriate timing. The musical tone control system 20 detects first key depression information S1 on a key 3 at a first position P1 corresponding to a key depression depth obtained before start of a let-off, second key depression information S2 on the key 3 at a second position P2 which corresponds to a larger key depression depth than the first position P1 does, and third key depression information S3, obtained after termination of the let-off, on the key at a third position P3 which corresponds to a larger key depression depth than the second position P2 does.

Abstract: A keyboard device for an electronic keyboard instrument, ensuring stable pivotal motion of each key and improved in each of assembly and disassembly. Each key extends in a front-rear direction and has a pivot shaft extending at a rear end in a left-right direction. A keyboard chassis has a mounting portion and key-separating support portions each for supporting the pivot shaft. A pivot shaft bearing member has a pivot shaft support portion cooperating with each key-separating support portion to form a bearing for the pivot shaft, supporting each key pivotally movable, and is removably mounted to the mounting portion. During assembly, with each key engaged with the key-separating support portion via the pivot shaft and held on the keyboard chassis, the mounting portion remains exposed, enabling the bearing member to be mounted from above or rear.

Abstract: A hammer for an electronic keyboard instrument, constructed to ensure secure mounting of a weight to a hammer body and enable both assembly and disassembly of the hammer to be easily performed. The hammer includes a hammer body having a weight mounting portion that is open on one side in a left-right direction and a weight removably mounted to the hammer body via a mounting portion. The weight mounting portion has a housing portion that has an opening having a shape complementary to the mounting portion, and houses the mounting portion in a manner slidable between a fit-in position and a fixed position, latching portions for latching the mounting portion incapable of falling off from the opening when in the fixed position, and holding portions for holding the mounting portion non-slidable to the fit-in position.

Abstract: A keyboard apparatus includes: a plurality of keys; a plurality of hammers; a first supporting portion; a second supporting portion; an interlocking mechanism. The interlocking mechanism conveys weight of the hammers respectively to rear portions of the keys, and causes an upward movement of the hammers, when front portions of the keys are depressed and the rear portions of the keys are swung upward. The interlocking mechanism is configured so as to maintain correspondence relations between depression speeds of the keys and moving speeds of the hammers within a range of inclinedable angles in which the keys are swingable when the front portions of the keys are depressed.

Abstract: A keyboard apparatus includes: a plurality of keys; a plurality of hammers; a first supporting portion; a second supporting portion; an interlocking mechanism. The interlocking mechanism conveys weight of the hammers respectively to rear portions of the keys, and causes an upward movement of the hammers, when front portions of the keys are depressed and the rear portions of the keys are swung upward.

Abstract: A keyboard instrument which is capable of ensuring sufficient strength of neighboring portions of chassis and preventing generation of noise, while restricting lateral motion of hammers. Keys are pivotally supported by chassis arranged side by side in a left-right direction. Hammers are pivotally supported by the chassis, for each being pivotally moved in accordance with depression of the associated key. Guides are formed in the chassis and each have a pair of left and right sidewalls opposed to the associated hammer from opposite sides, for restricting lateral motion of the associated hammer. Out of the guides, one at a boundary of each adjacent two of the chassis has the pair of sidewalls formed by an end sidewall of one of the adjacent two chassis and an end sidewall of the other of the same.

Abstract: A keyboard instrument which is capable of ensuring sufficient strength of neighboring portions of chassis and preventing generation of noise, while restricting lateral motion of hammers. Keys are pivotally supported by chassis arranged side by side in a left-right direction. Hammers are pivotally supported by the chassis, for each being pivotally moved in accordance with depression of the associated key. Guides are formed in the chassis and each have a pair of left and right sidewalls opposed to the associated hammer from opposite sides, for restricting lateral motion of the associated hammer. Out of the guides, one at a boundary of each adjacent two of the chassis has the pair of sidewalls formed by an end sidewall of one of the adjacent two chassis and an end sidewall of the other of the same.

Abstract: A keyboard device for an electronic keyboard musical instrument is provided for reducing the manufacturing cost by reducing the number of parts and the number of assembling steps associated with the attachment of a substrate, and securely attaching the substrate to a chassis through a spacer. The keyboard device comprises a plurality of keys; a chassis for supporting a plurality of keys; a substrate attached to the chassis for detecting information on depression on the keys; and a spacer interposed between the substrate and chassis. The spacer has tabs for preventing rotation, while the substrate is formed with engaging holes. The spacer is attached to the substrate with the tabs in engagement with the engaging holes. The substrate is attached to the chassis with a first screw driven into the spacer through the chassis.

Abstract: A keyboard device for an electronic keyboard musical instrument is provided for permitting a significant reduction in the number of parts constituting a hammer supporting members and the number of assembling steps required therefor, thereby reducing a manufacturing cost, and also for permitting hammers to be mounted in a high mounting accuracy to eliminate noise. The keyboard device comprises a chassis, a hammer rail made of an aluminum extrudate and coupled to the chassis, a plurality of keys pivotably supported by the chassis, a plurality of hammers each provided for each of the plurality of keys, pivotably supported by the hammer rail and configured to pivot in response to depression on a key associated therewith, and a stopper mounted to the hammer rail for restricting a pivotal movement of a hammer caused by depression on a key associated with the hammer.

Abstract: A keyboard device for an electronic keyboard musical instrument is provided for reducing the manufacturing cost by reducing the number of parts and the number of assembling steps associated with the attachment of a substrate, and securely attaching the substrate to a chassis through a spacer. The keyboard device comprises a plurality of keys; a chassis for supporting a plurality of keys; a substrate attached to the chassis for detecting information on depression on the keys; and a spacer interposed between the substrate and chassis. The spacer has tabs for preventing rotation, while the substrate is formed with engaging holes. The spacer is attached to the substrate with the tabs in engagement with the engaging holes. The substrate is attached to the chassis with a first screw driven into the spacer through the chassis.

Abstract: A keyboard device for an electronic keyboard musical instrument is provided for permitting a significant reduction in the number of parts constituting a hammer supporting members and the number of assembling steps required therefor, thereby reducing a manufacturing cost, and also for permitting hammers to be mounted in a high mounting accuracy to eliminate noise. The keyboard device comprises a chassis, a hammer rail made of an aluminum extrudate and coupled to the chassis, a plurality of keys pivotably supported by the chassis, a plurality of hammers each provided for each of the plurality of keys, pivotably supported by the hammer rail and configured to pivot in response to depression on a key associated therewith, and a stopper mounted to the hammer rail for restricting a pivotal movement of a hammer caused by depression on a key associated with the hammer.

Abstract: A keyboard apparatus for an electronic musical instrument has a metallic keyboard chassis and a balance rail provided on the keyboard chassis. A plurality of pins are provided on the balance rail. The pins and the balance rail constitute fulcrums for swingably supporting white keys and black keys. A hammer is provided in a rear side of each of the white and the black keys so as to be swingable by swinging of each of the respective keys by a second fulcrum comprising oval cross sectional shafts extending outwardly from the side surface of one of the hammer and a bearing member, the side surface extending perpendicular to a direction of swing movement of the hammer and a pair of bearing recesses for pivotally receiving the shaft, the bearing recesses being formed in the other of the hammer and the bearing member. Each of the bearing recesses has a guide slot for guiding each of the shafts from outside into the bearing recess for assembling.

Abstract: An apparatus for slidingly opening and closing a keyboard lid for covering a keyboard of a keyed instrument between an open position and a close is provided. The keyboard lid has a front end with a pair of opposite sides and a rear end with a pair of opposite sides. A pair of front guide projections project laterally from the opposite sides of the front end of the keyboard lid. A pair of rear guide projections project laterally from the opposite sides of the rear end of the keyboard lid. A pair of side plates are arranged on opposite sides of the keyboard. Each one of the pair of side plates has a front guide groove engaging with a respective one of the pair of front guide projections and a rear guide groove engaging with a respective one of the pair of rear guide projections. In this manner, the keyboard lid is slidably guided between an open position and a close position.

Abstract: A stand structure for a keyed instrument having a main body with a keyboard at the front thereof, the stand structure including a first side plate and a second side plate, the first side plate and the second side plate being adapted for supporting at least a lower portion of the main body arranged between the first side plate and the second side plate; a back plate arranged between the first side and the second side plate for reinforcing the first side and the second side plate, the back plate being adapted to be arranged below the main body; a first single securing member adapted for interconnecting the main body, the back plate and the first side plate; a second single securing member adapted for interconnecting the main body, the back plate and the second side plate; and a pair of screw means, each of the pair of screw means being adapted for extending laterally through one of the first side plate and the second side plate and into the lower portion of the main body so as to secure the main body to the one

Abstract: A securing structure for a stand of keyed instrument having a pair of side plates supporting a main body of the keyed instrument and a back plate spanned between the side plates and reinforcing them, the side plate and the back plate are interconnected by a screw through a securing plate with one end face of the back plate being abutted against a side face of the back plate being abutted against a side face of the side plate, the side plate has, at the side face thereof, a through aperture through which the screw can pass, the back plate has, at the end face thereof, an insert aperture corresponding to the through aperture, and at the side face thereof, a communicated aperture communicating with the insert aperture in a substantially octagonal direction relative to the insert aperture, the securing plate has a securing portion loosely inserted into the communicated aperture and having a threaded hole aligned with the insert aperture when the securing portion is inserted into the communicated aperture, and an