Patents Assigned to Kabushiki Kaisha Kawai Gakki Seisakusho
  • Patent number: 11037533
    Abstract: An upright keyboard instrument reduced in depth dimension and compact as a whole. Damper levers each extend in a vertical direction and are pivotally movably supported at or in the vicinity of a longitudinal center thereof, in a side-by-side arrangement in a left-right direction at a location rearward of actions. A damper rod extends in a left-right direction. A pedal rod extends in the vertical direction and is disposed forward of the damper levers, so as to be moved upward by depression of a pedal. A damper lever drive mechanism is provided between a longitudinal end of the damper rod and an upper end of the pedal rod and drives lower portions of the damper levers such that the lower portions are pressed rearward by moving the damper rod rearward in accordance with upward movement of the pedal rod.
    Type: Grant
    Filed: March 18, 2020
    Date of Patent: June 15, 2021
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventors: Mitsuo Yamashita, Hikari Ichihara
  • Patent number: 11017749
    Abstract: A touch weight adjustment mechanism for a keyboard device, which is capable of adjusting a touch weight of a key easily and appropriately by using a coil spring and changing the urging force of the spring. An adjustment spring is formed by a coil spring for causing a tensile force thereof to act on the key, thereby increasing the touch weight of the key. An adjustment shaft is formed in a rod shape and is movable in a lengthwise direction by being operated for rotation. A rotary connection member connects between one end of the adjustment spring and one end of the adjustment shaft, which are closest to each other, and a spring-side connecting portion thereof connected to the adjustment spring and a shaft-side connecting portion thereof connected to the adjustment shaft are rotatable relative to each other.
    Type: Grant
    Filed: March 17, 2020
    Date of Patent: May 25, 2021
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventors: Hanayo Tsuzuku, Yasushi Terai, Mikhail Vasilievich Pletnev
  • Patent number: 10847130
    Abstract: A keyboard device having keys enabling sufficient weight of touch to be obtained in spite of being configured to be shorter in length than those of the grand piano and. Link mechanisms are each provided on a base for supporting an associated one of the keys from below and configured to cause the associated key to operate such that when a front end of the key is depressed, an amount of downward movement of a rear end of the key becomes approximately half of an amount of downward movement of the front end of the key. Each link mechanism includes front-side and rear-side key link bars and front-side and rear-side connecting link bars. The front-side and rear-side connecting link bars are pivotally supported, respectively, and are pivotally and slidably connected to each other via respective rear and front ends thereof.
    Type: Grant
    Filed: September 16, 2019
    Date of Patent: November 24, 2020
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventors: Yasushi Terai, Mikhail Vasilievich Pletnev, Anton Anatolievich Nikitin, Hideyuki Ishida
  • Patent number: 10762884
    Abstract: A keyboard device for an electronic keyboard instrument, capable of suppressing bouncing of a hammer returning to its original position. A key extends in a front-rear direction swingably about a balance rail pin. The hammer is formed vertically pivotally movable between initial and pivotally-moved positions about a hammer fulcrum provided near a rear end of the key and is placed on the key via a key contact portion in contact with a rear end of upper surface of the key from above, for pivotal motion by swinging of the key. A hammer cushion is provided on upper surface of the key at a predetermined location forward of the key contact portion to suppress bouncing of the hammer by contact with a cushion contact portion of the hammer returning from the pivotally-moved position to the initial position by releasing the key depression.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: September 1, 2020
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Akihiro Suzuki
  • Patent number: 10725650
    Abstract: A handwritten music sign recognition device (10) has: a touch information obtaining part (21) which obtains, as position information, a position of an input means on a screen every time the input means moves, from when the input means touches the screen until when the input means is moved away therefrom; a vector information creation part (22) which creates attributes of a vector indicating a trace of movement of the input means as vector information based on the position information; and a stroke characteristic amount derivation part (23) which derives a characteristic amount of a stroke based on the vector information included in the stroke information.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: July 28, 2020
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Akihiro Fujita
  • Patent number: 10657930
    Abstract: A topboard reflection preventer for a grand piano, which is capable of positively preventing lighting from being reflected by an open topboard, while maintaining excellent appearance of a piano body. The topboard reflection preventer for a grand piano is attached to an openable and closable topboard formed by a topboard rear and a topboard front, and prevents lighting from above from being reflected by the topboard in a state of the topboard held open in an inclined position. The topboard reflection preventer includes a reflection preventer body attached to the topboard rear and the topboard front folded onto the topboard rear, in a state covering whole upper surfaces of the topboard rear and the topboard front, and a holding member for holding the reflection preventer body so as to prevent the reflection preventer body from falling off the topboard held open in the inclined position.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: May 19, 2020
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Hirohiko Miura
  • Patent number: 10636393
    Abstract: A long part-mounting structure of a piano, which makes it possible to mount a long part as a component part of a piano to a mounted member without causing warpage of the long part and maintain excellent appearance of the piano even when applied to a transparent piano. This long part-mounting structure is for mounting a keyslip as a component part of the piano to a keybed over the entire longitudinal length of the keyslip. The keyslip has a contact surface in contact with the keybed over the entire longitudinal length of keyslip and a mounting protrusion extending the entire longitudinal length of the keyslip and protruding a predetermined length toward the keybed from the contact surface. The keybed has a contacted surface with which the contact surface of the keyslip is brought into contact and a long groove into which the mounting protrusion is fitted.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: April 28, 2020
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Mitsuo Yamashita
  • Patent number: 10410610
    Abstract: A damper for a piano, which has a bifurcated damper felt of which a space between two protrusions is difficult to be narrowed. A damper head extends along three strings in a lengthwise direction thereof and is movable in directions in which the damper moves into and out of contact with the three strings. Damper felt is attached to a string-side surface of the damper head such that it extends in a lengthwise direction of the damper head, and includes two protrusions formed to protrude toward the strings in a bifurcated manner such that they can be brought into contact with the three strings in a state inserted into respective spaces therebetween. The damper felt is attached to the damper head such that deformation of the damper felt in which a space between the two protrusions is narrowed is resisted.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: September 10, 2019
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Yasushi Terai
  • Patent number: 10373596
    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.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: August 6, 2019
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventors: Akihiro Suzuki, Yoshiaki Shimoda
  • Patent number: 10360878
    Abstract: A topboard support device for a grand piano, in which a topboard prop can be accommodated without placing the same on ribs of a frame. The topboard support device supports a topboard capable of opening and closing the top of a piano body, in an open state, and includes the topboard prop for supporting the opened topboard from below by a tip end portion thereof, and a prop support member for supporting the topboard prop via a base end portion thereof in a manner pivotally movable about vertical and horizontal axes. The topboard prop is pivotally moved by the prop support member between a position for being accommodated in a space between the ribs of the frame and an outer rim, in a substantially horizontal posture, and a position for supporting the topboard, in a posture tilted in a manner rising toward a tip end.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: July 23, 2019
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Mitsuo Yamashita
  • Patent number: 10170086
    Abstract: A support device for a pivotal member of a keyboard instrument, in which opposite ends of a pivotal pin fixed to a pivotal member can be each properly positioned in the center of a pin hole, to thereby enable the pivotal member to perform efficient and stable pivotal motion. The support device that pivotally supports the pivotal member pivotally moved by key depression includes a flange body including two support walls opposed to each other with a predetermined spacing therebetween, and two pin holes which are formed in the respective support walls and in which opposite ends of the pivotal pin are inserted, respectively, and two bearings fixed in the pin holes in an inserted state and having opposite ends of the pivotal pin inserted therein, for pivotally supporting the pivotal. Each bearing is formed by a braid formed in a hollow cylindrical shape.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: January 1, 2019
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Takaaki Taguchi
  • Patent number: 10134371
    Abstract: A stroke adjustment device for a keyboard instrument, which can finely adjust key depression stroke and hammer stroke to obtain sufficient controllability of weak tones during musical performance and make the dynamic range even wider. This device includes a lifting mechanism for lifting up and down a keyboard pillow on which rear ends of keys are placed, an operation mechanism manually operated for driving the lifting mechanism, and a driving force transmission mechanism for transmitting a driving force generated by operation of the operation mechanism to the lifting mechanism. The lifting mechanism has a rotating shaft body rotatably provided below the keyboard pillow, vertically movable rack parts in mesh with gear portions that rotate in unison with the rotating shaft, and a lifting part extending over the rack parts and vertically moving in unison with the rack parts to lift up and down the keyboard pillow.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: November 20, 2018
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Hirotaka Higasa
  • Patent number: 9940916
    Abstract: A key guide structure for a keyboard instrument, which is capable of stably and appropriately guiding a key pivotally moved by key depression without generating noise. The key guide structure has guide holders each erected below a guide recess of each key, and guide members mounted to tops of the guide holders, respectively, each for sliding contact with lateral inner side surfaces of the recess. Each guide member includes a body disposed between the lateral inner side surfaces of the recess with a predetermined clearance, two lateral flexible portions laterally flexible and extending from lateral ends of a front or rear surface of the body in a manner protruding in a front-rear direction, and two lateral contact portions which are provided at front ends of the flexible portions in a manner protruding sideward and are in contact with the lateral inner side surfaces of the recess.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: April 10, 2018
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Akihiro Suzuki
  • Patent number: 9607587
    Abstract: A hammer device of an electronic piano with keys which swing in accordance with key depression, includes a hammer support that is made of a synthetic resin and has a fulcrum shaft, and a hammer having a shaft hole part for being fitted on the fulcrum shaft and configured to pivotally move about the fulcrum shaft in a manner interlocked with the swinging key. The fulcrum shaft has an outer peripheral surface formed by a pair of arcuately-curved surface portions opposite to each other and a pair of planar surface portions each extending between the pair of arcuately-curved surface portions and parallel to each other.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: March 28, 2017
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventors: Akihiro Suzuki, Hideyuki Ishida
  • Patent number: 9437173
    Abstract: Obtained is a structure of a piano action by which excellent playing reproducibility is secured even in a case of playing by repeatedly striking a key at an extremely high speed. In a piano action including a plurality of hammers 31 for striking keys, hammer shanks 32 that support the hammers turnably, hammer rails 1 that restrict the hammer shanks 32 from turning after the hammers strike strings, and hammer cushions (shock absorbing materials) 100 that are placed on the hammer rails and absorb motion energy generated by collision with the hammer shanks 32, the hammer cushions (shock absorbing materials) 100 are disposed at an angle so as not to become parallel to contact surfaces of the hammer shanks 32.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: September 6, 2016
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Yasushi Terai
  • Publication number: 20160202899
    Abstract: A handwritten music sign recognition device (10) has: a touch information obtaining part (21) which obtains, as position information, a position of an input means on a screen every time the input means moves, from when the input means touches the screen until when the input means is moved away therefrom; a vector information creation part (22) which creates attributes of a vector indicating a trace of movement of the input means as vector information based on the position information; and a stroke characteristic amount derivation part (23) which derives a characteristic amount of a stroke based on the vector information included in the stroke information.
    Type: Application
    Filed: January 15, 2015
    Publication date: July 14, 2016
    Applicant: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Akihiro FUJITA
  • Patent number: 9330648
    Abstract: An electronic keyboard musical instrument includes a storage device, a musical tone generation unit, a resonating sound generation unit, and an adding unit. The musical tone generation unit reads out corresponding musical tone waveform data from the storage device according to key depression information to generate a musical tone waveform signal and a first register resonating sound waveform signal. The resonating sound generation unit receives the musical tone waveform signal to cause the resonating sound generation circuit to generate a second register resonating sound waveform signal according to damper pedal operator manipulation information and the key depression information, and outputs the second register resonating sound waveform signal. The adding unit is configured to add the musical tone waveform signal and the resonating sound waveform signal from the musical tone generation unit and the resonating sound generation unit respectively, and outputting a resulting signal.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: May 3, 2016
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Kaoru Matsunaga
  • Patent number: 9305524
    Abstract: An electronic musical instrument capable of suppressing resonance of a soundboard and reducing a peak dip of the frequency characteristic of a musical tone to enable excellent musical sound to be obtained. The soundboard has first and second ends which extend parallel to each other. The first and second ends are secured to a predetermined part of the instrument by first screws and second screws. A vibration exciter is provided on the soundboard and driven according to a musical tone signal to vibrate the soundboard to cause the soundboard to generate a musical tone. The first and second screws are arranged along the respective first and second ends in a staggered manner such that each first screw and each first screw are not opposed to each other in symmetrical relation in a direction orthogonal to the first and second ends.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: April 5, 2016
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Takuya Satoh
  • Patent number: 9240171
    Abstract: An electronic musical instrument capable of providing spatially spread and dynamic musical tones by causing mutual resonance of first and second vibration exciters for vibrating an opposition board and a soundboard opposed to each other, respectively. A first vibration exciter provided on a surface, opposed to a soundboard, of a opposition board, and driven according to a musical tone signal, for vibrating the opposition board to generate a musical tone, and a second vibration exciter provided on a surface, opposed to the opposition board, of the soundboard and driven according to the musical tone signal for vibrating the soundboard to generate a musical tone is connected by a connecting member for causes the first and second vibration exciters to resonate with each other.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: January 19, 2016
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Takuya Satoh
  • Patent number: 9177535
    Abstract: A hammer device for a keyboard instrument, enabling improvement of efficiency and yield, in manufacturing weights to be attached to each hammer body while suppressing an increase in manufacturing cost. Each hammer includes a hammer body having a weight mounting portion, a common weight attached to one of left and right side surfaces of the weight mounting portion, and an adjustment weight having a length set according to a touch weight required by the associated key and attached to the other of the left and right side surfaces of the weight mounting portion. A chassis has a plurality of partition parts, and on the left and right surfaces of the hammer body, there are formed left and right opposed protrusions, respectively, each of which protrudes outward of the weight and is opposed to a partition part associated therewith via a predetermined clearance.
    Type: Grant
    Filed: October 20, 2014
    Date of Patent: November 3, 2015
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Akihiro Suzuki