Patents Assigned to Kabushiki Kaisha Kawai Gakki Seisakusho
  • 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
  • Publication number: 20150269922
    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: Application
    Filed: January 30, 2015
    Publication date: September 24, 2015
    Applicant: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Kaoru MATSUNAGA
  • Patent number: 9135895
    Abstract: A fallboard arrangement for a keyboard instrument, including a slide-type fallboard and enabling enhancing the degree of freedom of design while ensuring good appearance and smooth opening and closing operation of the fallboard, to improve marketability. A fallboard opens and closes a performance section. Arms have respective guide grooves for guiding sliding of the fallboard in a front-rear direction. Left and right side plates are provided for left and right ends of a front portion of the fallboard, and have shield walls for shielding areas around left and right end faces of the fallboard, respectively. Left and right guide bushes protrude outward from the side plates, for engagement with the guide grooves of the respective arms. The guide bushes are guided by the guide grooves of the respective arms during sliding of the fallboard in the front-rear direction.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: September 15, 2015
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Kohtaro Irimura
  • Patent number: 9082372
    Abstract: A keyboard device for a keyboard instrument capable of having each key easily mounted on a keyboard chassis while ensuring stable pivotal motion of the key, without damaging the key. A keyboard chassis holds keys in arrangement in a left-right direction. A key support part has a lower support portion for supporting a pivot shaft of a key from below, and left and right upper support portions erected with a predetermined spacing in the direction, for supporting a key rear end portion located upward of the shaft from above. When mounting the key to the key support part, the upper support portions have its spacing expanded by the key rear end, thereby being elastically deformed to pass the key rear end, and thereafter, elastically return to their original state to hold the key rear end in a retained state by cooperating with the lower support portion.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: July 14, 2015
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Akihiro Suzuki
  • Patent number: 9076410
    Abstract: A fallboard arrangement for a keyboard instrument, which makes it possible to make flat the entire upper surface of a keyboard instrument in a closed state. A fallboard back section is immovably provided in a rear part of the body, in a horizontal state. A fallboard is movable between a closed position where it is forward of the fallboard back section and has an upper surface thereof made flush with that of the fallboard back section in a state closing the performance section and an open position where it is upward of the fallboard back section so as to open the performance section. A hinge connects the fallboard to the fallboard back section in a manner pivotally movable between the closed position and the open position and is disposed downward of the fallboard in the closed position and the upper surface of the fallboard back section.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: July 7, 2015
    Assignee: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Seisaku Shinmachi
  • Patent number: 9070346
    Abstract: A white key for a keyboard instrument, which makes it possible to improve yield and marketability and reduce manufacturing costs. The white key for a keyboard instrument includes a wooden key body, a synthetic resin-made upper cover bonded to the key body, and a synthetic resin-made front cover bonded to a front end face of the key body. The upper cover has a protrusion protruding downward from a front end thereof, and the protrusion and an upper end of the front cover are in contact with each other via respective inclined surfaces formed on the protrusion and the upper end of the front cover.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: June 30, 2015
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Masahiko Abiko
  • Publication number: 20150128791
    Abstract: When a key depression speed and a key release speed of a key is to be detected based on a value of a counter (44) which accumulates a value every time the key passes through key switches (SW1, SW2), a number of digits of data indicating the key depression speed, a unit of the data being a bit and a number of digits of data indicating the key release speed, a unit of the data being a bit, are made the same.
    Type: Application
    Filed: February 19, 2013
    Publication date: May 14, 2015
    Applicant: KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO
    Inventor: Seiji Okamoto
  • Patent number: 9006549
    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: November 29, 2012
    Date of Patent: April 14, 2015
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Akihiro Suzuki, Hideyuki Ishida