Patents by Inventor Junji Hirai
Junji Hirai 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).
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Patent number: 5887430Abstract: A hydraulic source(20) comprises a hydraulic pump(62) driven by a motor(61), which operates based on the power and control data from a non-contact power feeding apparatus(30); a hydraulic tank(63); a solenoid valve(64); a relief valve(65); a hydraulic pressure gauge(66); a pilot check valve(67) for clamping and a pilot check valve(68) for unlocking that are interposed between the solenoid valve(64) and hydraulic cylinders(41a to 41d); a pressure switch(69) for clamping which is inserted into a piping for connecting the pilot valve(67) and the hydraulic cylinders(41a to 41d); and an pressure switch(70) for unclamping which is inserted into a piping for connecting the pilot check valve(68) and the hydraudic cylinders(41a to 41d). This hydraulic source is combined with a hydraulic machine for applications where jig or jigs move freely to promote automation of machining, assembly and inspection of workpieces on a moving body.Type: GrantFiled: April 29, 1996Date of Patent: March 30, 1999Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshio Aoyama, Yoshiji Hiraga, Hiroyuki Hamamoto, Kenji Hirose, Tatsuhiko Koba, Hideaki Wakao
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Patent number: 5818188Abstract: A noncontacting power transfer apparatus, a noncontacting signal transfer apparatus, to be referred to below as a power coupler and a signal coupler, respectively, and a separate machine apparatus that uses these couplers are disclosed. The power coupler is composed of a primary side and a secondary side that are fixed to a static unit and rotatable unit of the machine apparatus, respectively, such that its output does not vary with arbitrary rotation by the rotatable unit. The signal coupler is composed of receiving side portion having a electric-to-light conversion device that converts an electric signal to an optical signal of rotational symmetry relative to the axis of rotation of the rotatable unit and a photoelectric conversion device that converts an optical signal to an electric signal. Accordingly, the rotatable unit can be supplied with power from the static unit even while rotating, and moreover, can communicate with the static unit.Type: GrantFiled: December 9, 1996Date of Patent: October 6, 1998Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga, Kenji Hirose, Yuji Nitta, Hiroyuki Hamamoto, Kenji Nomura
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Patent number: 5798622Abstract: A noncontacting power transfer apparatus, a noncontacting signal transfer apparatus and a separate machine apparatus that uses these couplers are disclosed. The power coupler is composed of a primary side and a secondary side that are fixed to a static unit and rotatable unit of the machine apparatus, respectively, such that its output does not vary with arbitrary rotation by the rotatable unit. The signal coupler is composed of receiving side portion having a electric-to-light conversion device that converts an electric signal to an optical signal of rotational symmetry relative to the axis of rotation of the rotatable unit and a photoelectric conversion device that converts an optical signal to an electric signal. Accordingly, the rotatable unit can be supplied with power from the static unit even while rotating, and moreover, can communicate with the static unit. Further, the rotatable unit can be easily attached to the static unit and can be removed from the static unit.Type: GrantFiled: July 3, 1996Date of Patent: August 25, 1998Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga, Kenji Hirose, Yuji Nitta, Hiroyuki Hamamoto, Kenji Nomura
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Patent number: 5770936Abstract: A noncontacting power transfer apparatus, a noncontacting signal transfer apparatus(to be referred to below as a power coupler and a signal coupler, respectively), and a separate machine apparatus that uses these couplers are disclosed. The power coupler is composed of a primary side and a secondary side that are fixed to a static unit and rotatable unit of the machine apparatus, respectively, such that its output does not vary with arbitrary rotation by the rotatable unit. The signal coupler is composed of receiving side portion having a electric-to-light conversion device that converts an electric signal to an optical signal of rotational symmetry relative to the axis of rotation of the rotatable unit and a photoelectric conversion device that converts an optical signal to an electric signal. Accordingly, the rotatable unit can be supplied with power from the static unit even while rotating, and moreover, can communicate with the static unit.Type: GrantFiled: October 3, 1996Date of Patent: June 23, 1998Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga, Kenji Hirose, Yuji Nitta, Hiroyuki Hamamoto, Kenji Nomura
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Patent number: 5747894Abstract: A connector divice which can stably supply electric power and send and receive signals in a contactless way, i.e., without using any electrode contact, and without strict alignment of the device.Type: GrantFiled: September 11, 1996Date of Patent: May 5, 1998Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga, Kenji Nomura
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Patent number: 5737211Abstract: A linear-motion contactless power supply device for supplying electrical power from a stationary unit to a movable unit without direct contact; the stationary unit being a cylindrical primary conductor to which a high-frequency alternating current is supplied; the movable unit being provided with a secondary conductor which is isolated from the primary conductor and which is arranged coaxially with the primary conductor so as to be slidable in the longitudinal direction of and with respect to the primary conductor and also provided with a high-frequency toroidal core which is arranged so as to cover the secondary conductor from the outside.Type: GrantFiled: August 19, 1996Date of Patent: April 7, 1998Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga
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Patent number: 5712552Abstract: A robot which does not require electric wires (power transmission wires and signal wires) for interconnecting joint shafts is provided. An electrodeless unit for transmitting electric power by way of high-frequency electromagnetic induction and a unit for transmitting signals by way of optical transmission or high-frequency electromagnetic induction are installed in either a reduction gear that is coupled to the shaft of a motor for actuating each of the shafts of the robot or a direct-drive motor. Electric power or signal wires are drawn through a groove or hollow defined in an output shaft of the reduction gear or the direct-drive motor. Information produced ahead of the output shaft is fed back over signal wires that are drawn through the groove or hollow defined in the output shaft.Type: GrantFiled: March 29, 1996Date of Patent: January 27, 1998Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga, Yasuhiko Kaku, Ichiro Ishibashi
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Patent number: 5637973Abstract: A noncontacting power transfer apparatus, a noncontacting signal transfer apparatus, and a separate machine apparatus that uses these couplers are disclosed. The power coupler is composed of a primary side and a secondary side that are fixed to a static unit and rotatable unit of the machine apparatus, respectively, such that its output does not vary with arbitrary rotation by the rotatable unit. The signal coupler is composed of receiving side portion having a electric-to-light conversion device that converts an electric signal to an optical signal of rotational symmetry relative to the axis of rotation of the rotatable unit and a photoelectric conversion device that converts an optical signal to an electric signal. Accordingly, the rotatable unit can be supplied with power from the static unit even while rotating, and moreover, can communicate with the static unit. Further, the rotatable unit can be easily attached to the static unit and can be removed from the static unit.Type: GrantFiled: February 17, 1994Date of Patent: June 10, 1997Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Yoshiji Hiraga, Kenji Hirose, Yuji Nitta, Hiroyuki Hamamoto, Kenji Nomura
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Patent number: 5327073Abstract: A non-contact type load-dispatching equipment having a power supply side core and a receiving side core both provided with a plurality of teeth wound by winding, each of teeth top surfaces formed by respective teeth is oppositely positioned to each other via a gap being magnetically connected for supplying power without contact at the time of power supply, whereinteeth top surfaces of respective teeth of the power supply side core and receiving side core are disposed oppositely on the respective circumferences with a gap therebetween which allows coupling-uncoupling of the cores therethrough;light signal generating circuit for generating light signals which indicate receiving side voltages is provided in the power receiving side;voltage signal generation circuit which generates corresponding voltage signals on receiving the light signals and cut-off circuit for cutting off power supply when the generated voltage signal is lower than the predetermined value, where the voltage signal generation and cut-off circType: GrantFiled: January 11, 1993Date of Patent: July 5, 1994Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Junji Hirai, Toshihiro Ishibashi, Yuji Nitta
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Patent number: 4107757Abstract: In a pulse power source for applying a pulse voltage to a capacitive load; a series resonance circuit capable of generating transient oscillation is formed of the capacitive load adapted to be applied with the pulse voltage, an inductance for generating transient oscillation and a power source capacitor; the capacitive load is charged from the power source capacitor by first closing one of two switch elements provided in the midway of the resonance circuit, that is, a load charging switch element to make the voltage across said capacitive load rise up to about twice the voltage across the power source capacitor after a period equal to about 1/2 of a transient oscillation period of said series resonance circuit, to form a rising edge of the desired pulse voltage; then reversely, the power source capacitor is charged from the capacitive load by closing the other switch element, that is, a charge recovering switch element after first said one switch element has been closed to make the voltage across said capacitType: GrantFiled: June 30, 1977Date of Patent: August 15, 1978Assignee: Senichi MasudaInventors: Senichi Masuda, Junji Hirai