Patents by Inventor Yoji Nakajima

Yoji Nakajima 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: 20140224669
    Abstract: A wire electrode forwarding device is obtained that can slow down or halt rotation of a rotating body to prevent a wire electrode from being wound around the rotating body for transferring the wire electrode to a wire electrode collecting section. A wire electric discharge machine according to the present invention includes: a wire electrode supporting means that holds one end portion of a wire electrode; and a wire electrode forwarding device that has a forwarding means supplying a fluid to forward the wire electrode from a wire electrode guiding section to a wire electrode collecting section, a rotating body positioned on a path between the forwarding means and the wire electrode collecting section and diverting the forwarding direction of the wire electrode, and a rotation restraining means restraining rotation of the rotating body rotated by the fluid supplied from the forwarding means.
    Type: Application
    Filed: October 13, 2011
    Publication date: August 14, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoji Nakajima, Takuya Ogawa
  • Publication number: 20130193113
    Abstract: To provide a wire electrode removal device of a wire electric discharge machine, the wire electrode removal device including a wire-electrode guide unit that guides an end on a cut point side of a wire electrode cut by wire-electrode cut devices to outside of a running path, a rewind shaft that pressure-fixes the wire electrode on the cut point side guided by the wire-electrode guide unit with an end face thereof and rewinds the wire electrode on a columnar member having angular portions with subsequent rotational driving thereof, a rewind-shaft drive unit that drives the rewind shaft to perform pressure fixing or pressure releasing of the wire electrode with the rewind shaft, a scraper member that removes a wound wire electrode from the columnar member at a time of pressure releasing of the rewind shaft by the rewind-shaft drive unit, and a collection member that collects the removed wire electrode.
    Type: Application
    Filed: January 27, 2012
    Publication date: August 1, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoji Nakajima, Syuichiro Ishihara
  • Patent number: 8408515
    Abstract: A pressure-reducing valve is provided in which a diaphragm rod connected to a valve body of a valve mechanism is connected to a central part of a diaphragm having its peripheral edge part clamped between a body and a diaphragm cover, wherein the diaphragm (28) is formed from a disk-shaped rubber sheet for which the sheet thickness of at least its peripheral edge part is uniform in the natural state, and in a state in which the diaphragm cover (17) is fixed to the body (16) so that the peripheral edge part of the diaphragm (28) is compressively held between a collar portion (17b) of the diaphragm cover (17) and a clamping face (91) of the body (16), a portion having, of the gap between the collar portion (17b) and the clamping face (91), a minimum gap is positioned further inward in the radial direction of the diaphragm (28) than a portion having a maximum gap.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: April 2, 2013
    Assignee: Keihin Corporation
    Inventors: Hiroaki Yamamoto, Yutaka Chiba, Yoshio Saito, Yoji Nakajima
  • Patent number: 8206477
    Abstract: A liquid trap device for a gas is provided which includes a trap housing (3) that is formed from a ceiling wall (5), a bottom wall (6) and a peripheral wall (7), the ceiling wall (5) having provided therein a gas inlet port (20) and a gas outlet port (21), and a filter element (4) that is retained between the ceiling wall (5) and the bottom wall (6), the interior of the filter element (4) communicating with the gas inlet port (20) and the outer peripheral face of the filter element (4) communicating with the gas outlet port (21) via an internal space (8) of the trap housing (3), wherein the trap housing (3) is formed as a shape that in plan view is long along one laterally central line (X), and the filter element (4) and an outlet port upstream portion (21a), opening within the trap housing (3), of the gas outlet port (21) are disposed in proximity to first and second side wall portions (7a, 7b) respectively of the peripheral wall (7) facing each other on the laterally central line (X).
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: June 26, 2012
    Assignee: Keihin Corporation
    Inventors: Takashi Saito, Jun Ono, Takashi Yoshida, Yoji Nakajima
  • Patent number: 8181668
    Abstract: A pressure reducing valve for gas is provided in which a valve mechanism having opening in a central part a valve hole that communicates with a low pressure passage and a low pressure chamber and including a valve body that is capable of being seated on a valve seat facing a valve chamber communicating with a high pressure passage is housed within a body such that the valve body is connected to a pressure receiving member operating in response to pressure of the low pressure passage and the low pressure chamber, wherein the body (16) is formed by joining a plurality of body members (18, 19) having different strengths, the entirety of the high pressure passage (30, 64) being formed, among the plurality of body members (18, 19), within the body member (18) that has a high strength, and at least part of the low pressure passage (85, 86, 94, 119) and the low pressure chamber (83, 84, 116) being formed, among the plurality of body members (18, 19), within the body member (19) that has a low strength.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: May 22, 2012
    Assignee: Keihin Corporation
    Inventors: Hiroaki Yamamoto, Yoji Nakajima, Yoshio Saito, Yutaka Chiba
  • Publication number: 20120018541
    Abstract: A gas fuel injection valve is provided in which a single nozzle member (11) is fixedly provided in a front end part of a valve housing (2), and this nozzle member (11) has formed therein a valve seat (13), a valve hole (45) extending through a central part of the valve seat (13), a throttle hole (46) having a smaller diameter than that of the valve hole (45) and communicating with an outlet of the valve hole (45), and a nozzle hole (48) having a larger diameter than that of the throttle hole (46) and communicating with an outlet of the throttle hole (46), wherein when an internal diameter of the throttle hole (46) is D1, a length of the throttle hole (46) is L1, an internal diameter of the nozzle hole (48) is D2, and a length of the nozzle hole (48) is L2, L1/D1>1??(1) 1<D2/D1?1.2??(2) the above expressions (1) and (2) are satisfied.
    Type: Application
    Filed: March 17, 2010
    Publication date: January 26, 2012
    Applicant: Keihin Corporation
    Inventors: Toshinori Kuzuma, Takashi Yoshida, Wataru Sato, Yoji Nakajima
  • Patent number: 8058582
    Abstract: An electrical-discharge machining apparatus for machining a workpiece using an aqueous machining fluid includes an insulator for electrically insulating a machine platen from the workpiece where the workpiece is placed. A machining-fluid-property measuring instrument measures the state of the machining fluid; and a machining-fluid-property controller maintains the pH of the machining fluid so as to be kept within 8.5 through 10.5.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: November 15, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hisakatsu Kawarai, Syuichiro Ishihara, Yoji Nakajima, Hisashi Yamada
  • Publication number: 20100269460
    Abstract: A liquid trap device for a gas is provided which includes a trap housing (3) that is formed from a ceiling wall (5), a bottom wall (6) and a peripheral wall (7), the ceiling wall (5) having provided therein a gas inlet port (20) and a gas outlet port (21), and a filter element (4) that is retained between the ceiling wall (5) and the bottom wall (6), the interior of the filter element (4) communicating with the gas inlet port (20) and the outer peripheral face of the filter element (4) communicating with the gas outlet port (21) via an internal space (8) of the trap housing (3), wherein the trap housing (3) is formed as a shape that in plan view is long along one laterally central line (X), and the filter element (4) and an outlet port upstream portion (21a), opening within the trap housing (3), of the gas outlet port (21) are disposed in proximity to first and second side wall portions (7a, 7b) respectively of the peripheral wall (7) facing each other on the laterally central line (X).
    Type: Application
    Filed: May 6, 2010
    Publication date: October 28, 2010
    Applicant: KEIHIN CORPORATION
    Inventors: Takashi SAITO, Jun ONO, Takashi YOSHIDA, Yoji NAKAJIMA
  • Patent number: 7795558
    Abstract: In an electric discharge machining apparatus that machines a workpiece (1) by using a water-based dielectric fluid as a dielectric fluid while a voltage is being applied to a machining gap between an electrode (2) and the workpiece (1), the electric discharge machine includes: an anticorrosive power source section (26) that applies a predetermined voltage by taking the workpiece (1) as a cathode and taking as an anode an anticorrosive electrode (25) opposing the workpiece (1) with an insulator (24) therebetween; a dielectric fluid quality measuring instrument (22) that measures a quality of the dielectric fluid; and a dielectric fluid quality control section (16, 17, 18, 19, 20, 21, 23) that controls a pH level of the dielectric fluid to be within a range from 8.5 to 10.5 on the basis of the measured result of the dielectric fluid quality measuring instrument (22).
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: September 14, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoji Nakajima, Hisakatsu Kawarai, Syuichiro Ishihara, Hisashi Yamada
  • Publication number: 20100224806
    Abstract: A pressure-reducing valve is provided in which a diaphragm rod connected to a valve body of a valve mechanism is connected to a central part of a diaphragm having its peripheral edge part clamped between a body and a diaphragm cover, wherein the diaphragm (28) is formed from a disk-shaped rubber sheet for which the sheet thickness of at least its peripheral edge part is uniform in the natural state, and in a state in which the diaphragm cover (17) is fixed to the body (16) so that the peripheral edge part of the diaphragm (28) is compressively held between a collar portion (17b) of the diaphragm cover (17) and a clamping face (91) of the body (16), a portion having, of the gap between the collar portion (17b) and the clamping face (91), a minimum gap is positioned further inward in the radial direction of the diaphragm (28) than a portion having a maximum gap.
    Type: Application
    Filed: July 8, 2008
    Publication date: September 9, 2010
    Applicant: KEIHIN CORPORATION
    Inventors: Hiroaki Yamamoto, Yutaka Chiba, Yoshio Saito, Yoji Nakajima
  • Patent number: 7735757
    Abstract: A gaseous fuel injection valve includes: a valve housing; a metallic nozzle member having a flat valve seat and a nozzle bore passing through a central portion of the valve seat; a valve body provided at one end face with a rubber seating member which is operated in cooperation with the valve seat; a coil; and a return spring for urging a stationary core and the valve body toward the valve seat. The stationary core attracts the valve body to move the seating member away from the valve seat, when the coil is excited. In this injection valve, a fluorine resin valve seat coating is formed on the valve seat so that the seating member is brought into close contact with the valve seat coating. Thus, an oil-repellent property of the valve seat coating is provided to the valve seat to prevent adherence of oil to the valve seat, leading to an improvement in valve-opening response of the valve body upon the excitation of the coil.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: June 15, 2010
    Assignee: Keihin Corporation
    Inventors: Yoji Nakajima, Naoto Takiguchi, Takashi Yoshida
  • Publication number: 20090320935
    Abstract: A pressure reducing valve for gas is provided in which a valve mechanism having opening in a central part a valve hole that communicates with a low pressure passage and a low pressure chamber and including a valve body that is capable of being seated on a valve seat facing a valve chamber communicating with a high pressure passage is housed within a body such that the valve body is connected to a pressure receiving member operating in response to pressure of the low pressure passage and the low pressure chamber, wherein the body (16) is formed by joining a plurality of body members (18, 19) having different strengths, the entirety of the high pressure passage (30, 64) being formed, among the plurality of body members (18, 19), within the body member (18) that has a high strength, and at least part of the low pressure passage (85, 86, 94, 119) and the low pressure chamber (83, 84, 116) being formed, among the plurality of body members (18, 19), within the body member (19) that has a low strength.
    Type: Application
    Filed: January 22, 2008
    Publication date: December 31, 2009
    Applicant: KEIHIN CORPORATION
    Inventors: Hiroaki Yamamoto, Yoji Nakajima, Yoshio Saito, Yutaka Chiba
  • Publication number: 20090277876
    Abstract: An electrical-discharge machining apparatus for machining a workpiece (1), using an aqueous machining fluid as a machining fluid, while applying voltage across a machining gap formed between an electrode (2) and the workpiece (1), includes: an insulating means (12) for electrically insulating from the workpiece (1) a machine platen (11) where the workpiece is placed; a machining-fluid-property measuring instrument (22) for measuring a state of the machining fluid; and a machining-fluid-property control means (106,107,108,109,110,111,113) for controlling, based on a measured result from the machining-fluid-property measuring instrument (112), the pH of the machining fluid so as to be kept within 8.5 through 10.5.
    Type: Application
    Filed: October 18, 2006
    Publication date: November 12, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hisakatsu Kawarai, Syuichiro Ishihara, Yoji Nakajima, Hisashi Yamada
  • Publication number: 20090057274
    Abstract: In an electric discharge machining apparatus that machines a workpiece (1) by using a water-based dielectric fluid as a dielectric fluid while a voltage is being applied to a machining gap between an electrode (2) and the workpiece (1), the electric discharge machine includes: an anticorrosive power source section (26) that applies a predetermined voltage by taking the workpiece (1) as a cathode and taking as an anode an anticorrosive electrode (25) opposing the workpiece (1) with an insulator (24) therebetween; a dielectric fluid quality measuring instrument (22) that measures a quality of the dielectric fluid; and a dielectric fluid quality control section (16, 17, 18, 19, 20, 21, 23) that controls a pH level of the dielectric fluid to be within a range from 8.5 to 10.5 on the basis of the measured result of the dielectric fluid quality measuring instrument (22).
    Type: Application
    Filed: April 5, 2006
    Publication date: March 5, 2009
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoji Nakajima, Hisakatsu Kawarai, Syuichiro Ishihara, Hisashi Yamada
  • Patent number: 7192665
    Abstract: A regulator for use with fuel cells, which is mounted in a pressure controller of a fuel cell system, has a first diaphragm flexible under the pressure of pilot air supplied as an oxidizing agent to a pilot chamber, a second diaphragm flexible under the pressure of a hydrogen-containing gas flowing through a fluid passage, and a rod connected to a valve head. The spring force of a first spring is set to a value greater than the spring force of a second spring. The regulator is of a normally closed type in which the valve head is seated on a valve seat when the pilot air is not supplied to the pilot chamber.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: March 20, 2007
    Assignee: Keihin Corporation
    Inventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
  • Publication number: 20070029413
    Abstract: A gaseous fuel injection valve includes: a valve housing; a metallic nozzle member having a flat valve seat and a nozzle bore passing through a central portion of the valve seat; a valve body provided at one end face with a rubber seating member which is operated in cooperation with the valve seat; a coil; and a return spring for urging a stationary core and the valve body toward the valve seat. The stationary core attracts the valve body to move the seating member away from the valve seat, when the coil is excited. In this injection valve, a fluorine resin valve seat coating is formed on the valve seat so that the seating member is brought into close contact with the valve seat coating. Thus, an oil-repellent property of the valve seat coating is provided to the valve seat to prevent adherence of oil to the valve seat, leading to an improvement in valve-opening response of the valve body upon the excitation of the coil.
    Type: Application
    Filed: August 3, 2006
    Publication date: February 8, 2007
    Inventors: Yoji Nakajima, Naoto Takiguchi, Takashi Yoshida
  • Patent number: 7157168
    Abstract: A back pressure chamber is defined at an end of a rod for acting in a direction to cancel out a pressure applied to a valve head, and an aspirator chamber is defined closely to the valve head for developing a pressure lower than a secondary pressure due to a suction caused by a nozzle. The rod has a first communication hole and a second communication hole that are defined therein which provides fluid communication between the back pressure chamber and the aspirator chamber.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: January 2, 2007
    Assignee: Keihin Corporation
    Inventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
  • Publication number: 20060127722
    Abstract: A regulator for use with fuel cells, which is mounted in a pressure controller of a fuel cell system, has a first diaphragm flexible under the pressure of pilot air supplied as an oxidizing agent to a pilot chamber, a second diaphragm flexible under the pressure of a hydrogen-containing gas flowing through a fluid passage, and a rod connected to a valve head. The spring force of a first spring is set to a value greater than the spring force of a second spring. The regulator is of a normally closed type in which the valve head is seated on a valve seat when the pilot air is not supplied to the pilot chamber.
    Type: Application
    Filed: December 1, 2003
    Publication date: June 15, 2006
    Applicant: Keihin Corporation
    Inventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
  • Publication number: 20040231726
    Abstract: A back pressure chamber is defined at an end of a rod for acting in a direction to cancel out a pressure applied to a valve head, and an aspirator chamber is defined closely to the valve head for developing a pressure lower than a secondary pressure due to a suction caused by a nozzle. The rod has a first communication hole and a second communication hole that are defined therein which provides fluid communication between the back pressure chamber and the aspirator chamber.
    Type: Application
    Filed: December 1, 2003
    Publication date: November 25, 2004
    Applicant: Keihin Corporation
    Inventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
  • Patent number: 6176256
    Abstract: A gas pressure-reducing valve in which a valve member to be seated on a valve seat having a valve hole opened at its central portion and leading to a pressure-reducing chamber between a body and a diaphragm is fixed on a valve stem connected to the central portion of the diaphragm and arranged coaxially with the valve axis. A bottomed mounting bore which is aligned with the valve axis and opened toward the pressure-reducing chamber is formed in the body. A cylindrical valve seat member forming a valve chamber between itself and the closed end of the mounting bore for accommodating the valve member and inserted into the mounting bore is fixed on the body. A valve seat facing the valve chamber is formed on the inner surface of the end portion of the valve seat member on the side of the pressure-reducing chamber. This arrangement makes it possible to reduce the number of parts and to enhance the degree of freedom for the arrangement of the parts in the body.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: January 23, 2001
    Assignees: Keihin Corporation, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yoji Nakajima, Hiroyuki Iwasaki, Kazuki Ishikawa, Yoshio Saito, Nobuo Arai, Hiroyuki Goto, Shuichi Togasawa