Patents by Inventor Shigeki Kawada

Shigeki Kawada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200239718
    Abstract: An aqueous ink jet composition of the present disclosure includes: at least one dye selected from the group consisting of C.I. Solvent Yellow 160:1, C.I. Disperse Yellow 82, and C.I. Disperse Yellow 184; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of an ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of a polyalkylene glycol; and an anionic dispersant.
    Type: Application
    Filed: January 29, 2020
    Publication date: July 30, 2020
    Inventors: Kenji KITADA, Hiroko HAYASHI, Yasunari IKEDA, Hisashi OKAMURA, Kenta KIKUCHI, Hirofumi HOKARI, Shinichi NAITO, Kazumasa OTSUKI, Michio NAKAMORI, Shinichi YAMAMOTO, Seiji KAGAMI, Shigeki KAWADA
  • Publication number: 20200207997
    Abstract: An aqueous ink jet composition according to the present disclosure includes: C.I. Disperse Red 364 as a first component; a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof; and a third component having an indigo skeleton and a chemical structure of at least one of a sulfo group and a salt thereof.
    Type: Application
    Filed: December 26, 2019
    Publication date: July 2, 2020
    Inventors: Yasunari IKEDA, Hirofumi HOKARI, Shinichi YAMAMOTO, Shigeki KAWADA, Michio NAKAMORI
  • Publication number: 20200207999
    Abstract: An aqueous ink jet composition contains: C.I. Disperse Red 364; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of the ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of the polyalkylene glycol; and an anionic dispersant.
    Type: Application
    Filed: December 26, 2019
    Publication date: July 2, 2020
    Inventors: Hisashi OKAMURA, Hiroko HAYASHI, Kenji KITADA, Yasunari IKEDA, Hirofumi HOKARI, Shinichi YAMAMOTO, Michio NAKAMORI, Shigeki KAWADA, Kenta KIKUCHI, Kazumasa OTSUKI, Seiji KAGAMI, Shinichi NAITO
  • Patent number: 10487227
    Abstract: An ink set which is used for sublimation transfer includes a first ink, and a second ink. The first ink has a color after transfer of |a*|?10 and |b*|?10 in a CIELAB color space, and contains a first disperse dye dispersed by a first dispersion resin. The second ink has a color after transfer of |a*|>10 or |b*|>10 in the CIELAB color space, and contains a second disperse dye dispersed by a second dispersion resin. A glass transition temperature of the first dispersion resin and is different than that of the second dispersion resin.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: November 26, 2019
    Assignee: Seiko Epson Corporation
    Inventors: Takayoshi Kagata, Hiroshi Fukumoto, Takeshi Yano, Miho Nakamura, Shugo Hattori, Katsuko Aoki, Shigeki Kawada
  • Publication number: 20190092953
    Abstract: An ink set which is used for sublimation transfer includes a first ink, and a second ink. The first ink has a color after transfer of |a*|?10 and |b*|?10 in a CIELAB color space, and contains a first disperse dye dispersed by a first dispersion resin. The second ink has a color after transfer of |a*|>10 or |b*|>10 in the CIELAB color space, and contains a second disperse dye dispersed by a second dispersion resin. A glass transition temperature of the first dispersion resin and is different than that of the second dispersion resin.
    Type: Application
    Filed: September 26, 2018
    Publication date: March 28, 2019
    Inventors: Takayoshi KAGATA, Hiroshi FUKUMOTO, Takeshi YANO, Miho NAKAMURA, Shugo HATTORI, Katsuko AOKI, Shigeki KAWADA
  • Patent number: 5334924
    Abstract: Speed control of an induction motor is effected in digital fashion through use of a computer but without complex processing, and with a computer that need not be large in scale. This is accomplished by processing at least a speed command signal, actual speed signal and torque signal in analog fashion, enabling simplification of an induction motor speed control digital processing section which performs all other control operations in a digital manner. In a speed control network having a closed loop, a frequency-to-voltage converter, adder-subtractor, proportional integrator, polarity determining circuit absolute value circuit and voltage-to-frequency converter are constructed of circuitry operable on the basis of analog values, with all other circuits being constructed of circuitry operable on the basis of digital values.
    Type: Grant
    Filed: October 30, 1981
    Date of Patent: August 2, 1994
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Hiroshi Ishida
  • Patent number: 5281903
    Abstract: A drive control method for a variable reluctance type motor capable of improving the motor efficiency by preventing generation of a disturbance torque. In function generators (8A to 8C) of a controller for embodying the method, the motor rotation direction and the motor driving mode are determined based on the generation order of A- and B-phase feedback pulses from a pulse coder (7) and the sign of a torque command (Tc) from a speed loop compensation circuit (1), and, on the basis of the determination results, either one of four excitation patterns is selected. Function signal values corresponding to actual motor electrical angles (.theta.) are generated from the function generators in accordance with the selected excitation pattern, and excitation of individual phases of the motor (6) is controlled by power amplifiers (4A to 4C) which respond to voltage commands derived based on these function signal values.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: January 25, 1994
    Assignee: Fanuc Ltd
    Inventors: Hideaki Oku, Yo Ikebe, Hidetsugu Komiya, Shigeki Kawada, Takeshi Nakamura
  • Patent number: 4796352
    Abstract: In an AC servomotor constructed so that the outer circumference (21b) of a stator core (21) formed by laminating thin steel plates (22) is used as part of a motor housing, bearing mounting bores (25a, 26a) for receiving bearing members (27, 28) to be mounted on a pair of brackets (25, 26) attached to the front and rear ends of the stator core (21) and mounting surfaces (25b, 25c) of the motor are formed with accurate concentricity and squareness with reference to the center bore (21a) and the outer circumference (21b) of the stator core (21) after firmly joining the brackets (25, 26) to the stator core (21). Thus, a rotor (29) is supported with high accuracy in concentricity with the stator core (21) on the brackets (25, 26) and the squareness of the output shaft (29a) to the mounting surfaces (25b, 25c) is established.
    Type: Grant
    Filed: May 13, 1987
    Date of Patent: January 10, 1989
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4748360
    Abstract: A rotor for a synchronous motor, having a plurality of first magnetic poles formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke fixed to a rotatable motor shaft, and a second magnetic pole projecting radially from the yoke adjacently to each first magnetic pole and the second magnetic pole wherein the shape of the pole face of each first magnetic poles are in a circular arc and the shape of the pole face of each of second magnetic pole is determined by a given equation so that the magnetic flux distribution established by a pair of the first magnetic pole and the second magnetic pole is substantially equivalent to a sinusoidal magnetic flux distribution in the sweeping effect by the armature coils of each phase of the stator.
    Type: Grant
    Filed: April 24, 1987
    Date of Patent: May 31, 1988
    Assignee: Fanuc, Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4714852
    Abstract: A permanent-magnet field synchronous motor comprises a rotor body (22) having a cylindrical outer surface. A plurality of permanent magnets (25) attached to the cylindrical outer surface of the rotor body and arranged in the circumferential direction thereof form a field system. Each of the permanent magnets has an outer surface (25b) which extends circumferentially in parallel to the cylindrical outer surface of the rotor body and also has a constant thickness in the whole thereof. The inner surface and the outer surface of each of the permanent magnets has a certain configuration, respectively, each of which is composed of a plurality of straight lines and approximates to a contour line consisting of half-sine curves (S.sub.1, S.sub.2) extending between the circumferential opposite ends of each of the permanent magnets when developed in a plane surface.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: December 22, 1987
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Kazushi Kumagai
  • Patent number: 4700097
    Abstract: A synchronous machine comprising a stator (41) having armature windings matching to a .phi. phase power source and S number of slots (42) accommodating the armature windings, and a rotor (31) having a number of field poles (32) identical with the P number of poles of the rotor (31) and magnets (33) for exciting the field pole (32), in which where the number of the slots per pole per phase S/P.phi. is expressed by an irreducible fraction m/n, the length (W) of the portion of the field pole (32) facing to the slots (42) of the stator (41) along the circular direction is selected out of the integer multiple value of 1/n of the slot (42) pitch length (L) in the stator (41), whereby slot ripple is reduced and the lack of uniformity of the velocity at light load operation is decreased when the synchronous machine is used as a servomotor.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: October 13, 1987
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4663550
    Abstract: A motor with DC brake having a DC electromagnetic brake (10) arranged on the shaft (14) of the rotor (16) thereof, in which a partial shaft (14b) extending through and outward from the DC electromagnetic brake (10) is formed of a nonmagnetic metal material. A partial shaft (14a) extending through the rotor (16) is formed of a free cutting metal material, and partial shafts (14a) and (14b) are coaxially united to form the integral shaft (14) at a junction (18) by friction welding.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: May 5, 1987
    Assignee: Fanuc LTD
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Katsuya Sugahara
  • Patent number: 4661736
    Abstract: A rotor for a synchronous motor, having a plurality of first magnetic poles (19) formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke (18) fixed to a rotatable motor shaft (14), and a second magnetic pole (18a) projecting radially from the yoke (18) adjacently to each first magnetic pole (19) so as to form a pair of a first magnetic pole (19) and the second magnetic pole (18a), wherein the shape of the pole face of each second magnetic pole (18a) is decided so that the magnetic flux distribution established by a pair of the first magnetic pole (19) and the second magnetic pole (18a) is practically equivalent to a sinusoidal magnetic flux distribution in the sweeping effect by the armature coils of each phase of the stator (11).
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: April 28, 1987
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4631807
    Abstract: A permanent-magnet field rotor (10) includes a plurality of permanent magnets (18) disposed in a radial fashion, and yokes (19) disposed between each two successive permanent magnets (18) and made of a lot of sheet elements (20). The method of manufacturing the permanent-magnet field rotor comprises the step of stacking a lot of same shaped thin plate members (25) each having a plurality of sectoral york element portions (26) arranged in a radial fashion and link portions (27) each linking the outer circumferential edges of each two successive york element portions (26) to one another so as to define therebetween a permanent magnet receiving slot (29). In the state where permanent magnets (18) are inserted in the slots (29) of the stacked thin plate members (25), respectively, the stacked thin plate members (25) are firmly fixed to each other.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: December 30, 1986
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4626725
    Abstract: A synchronous rotary machine comprising a stacked stator iron core (21) made of a number of thin plates stacked in the axial direction. The stator iron core forms a part of the outer shell of the synchronous rotary machine. A winding (23) is wound around the stator iron core. A pair of brackets (24, 25) are attached to the opposite ends of the stator iron core. A rotor assembly (29) is rotatably supported on the brackets through bearings mounted to the brackets, respectively. The brackets and stator iron core are tightened in the axial direction thereof and firmly fixed to each other. At least two rods (31) having the same length are provided on the stator iron core. Each of the rods extends through the stator iron core in the axial direction. When the stator iron core is contracted to a predetermined length, the opposite end surfaces thereof abut against the brackets, respectively, and limit the distance between the brackets.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: December 2, 1986
    Assignee: Fanuc Ltd
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4614020
    Abstract: An automatic tool changing mechanism includes a spindle mechanism (11) having at least a spindle (11a) and a first gear (11b) rotatable in unison with the spindle; a spindle motor (12) for rotating the spindle; a tool magazine (20) having at least a storage unit (20b) for storing a plurality of tools (21), a second gear (20c) rotatable in unison with the storage unit, and a slider (20e) slidably mounted on the spindle mechanism; a Z-axis motor (19a) for moving the spindle mechanism in the direction of a Z-axis; a constraining member (23) for constraining the tool magazine against movement thereof in the direction of the Z-axis and a control circuit (102, 103) for controlling the indexing. During machining operation, the first and second gears are brought out of mesh with each other, and the spindle is rotated by the spindle motor at a prescribed speed to enable a tool mounted on the spindle to machine a workpiece.
    Type: Grant
    Filed: May 4, 1983
    Date of Patent: September 30, 1986
    Assignee: Fanuc Ltd
    Inventors: Shigeki Kawada, Yoshiki Fujioka
  • Patent number: 4543506
    Abstract: A rotor structure comprising a shaft and a magnetic pole assembly comprising radially disposed permanent magnets and yokes. The magnetic pole assembly is supported by the shaft through end plates. The end plate has a recess to receive the end of the magnetic pole assembly. The magnetic pole assembly can be fit into the end plates.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: September 24, 1985
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe
  • Patent number: 4538084
    Abstract: Through holes (11, 12, 13 . . . ) are made at predetermined locations of a stator core (1). Reinforcing bars are inserted thereinto while fixed to the stator core by welding (81, 82, 83 . . . ). The stator core is supported between a front bracket (31) and a rear bracket (32) from both sides. Front side tap bolts (91, 92, 93 . . . ) and rear side tap bolts (61, 62, 63 . . . ) are engaged through the front bracket and the rear bracket with internal threads of both ends of the reinforcing bars, thereby fixing in place the stator core, front bracket, and rear bracket. By the foregoing structure, it is possible to improve the heat radiation action of a stator core, and also achieve a compacter motor.
    Type: Grant
    Filed: April 20, 1984
    Date of Patent: August 27, 1985
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
  • Patent number: 4518916
    Abstract: A system for detecting the rotational speed of a rotating body comprising the steps of generating two kinds of signals A and B having alternating wave forms and corresponding to the rotational speed of the rotating body by means of position-detecting devices (5a, 5b), the signals A and B having the same amplitude and having phases deviating by 90.degree.
    Type: Grant
    Filed: June 23, 1982
    Date of Patent: May 21, 1985
    Assignee: Fujitsu Fanuc Limited
    Inventors: Shigeki Kawada, Hiroshi Ishida
  • Patent number: 4485320
    Abstract: A stator of an electric motor comprises a laminated iron-core (1) having dovetail grooves, end plates (2) and steel bars (3) which are accommodated in the dovetail grooves and have a trapezoidal shape in cross-section. The steel bars (3) are arc-welded to the laminated iron-core (1) and to the end plates (2).
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: November 27, 1984
    Assignee: Fanuc Ltd.
    Inventors: Shigeki Kawada, Shigeaki Oyama, Kousei Nakamura, Jiro Nakano