Patents by Inventor Akira Takagi

Akira Takagi 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).

  • Patent number: 5906555
    Abstract: A hydraulic pressure control system for an automatic transmission is capable of reducing the size and simplifying the structure of a lockup controlling hydraulic circuit. An oil pressure output from a solenoid valve acts on an oil pressure chamber. The internal pressure of another oil pressure chamber becomes high only in a forward low-speed range and becomes low in all of the other gear shift ranges. The internal pressure of another oil pressure chamber becomes high only in forward ranges and becomes low in neutral and reverse ranges. The valve member moves in accordance with oil pressures applied to the oil pressure chambers to change over oil paths connected to a clutch control oil chamber and a torque converter oil chamber, whereby a lockup clutch assumes one of engaged, slip, and released states.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: May 25, 1999
    Assignee: Denso Corporation
    Inventors: Shinya Sakaguchi, Kazushi Nakatani, Akira Takagi
  • Patent number: 5865704
    Abstract: To provide a hydraulic controller for automatic transmission use which commonalizes a lockup control valve and a friction engagement element control valve, thereby simplifying a hydraulic circuit, reducing the number of parts, and achieving low cost, a lockup solenoid to control engagement or release of a lockup clutch, a first friction engagement element to engage an friction engagement element only in a portion or entirety of a shifting stage to prohibit lockup, and a manual shift lever to determine whether a vehicle exists in a lockup prohibition condition are provided. A switching valve selectively switches the lockup solenoid to either communicate with the lockup clutch or communicate with the foregoing first friction engagement element. The manual shift valve is disposed in a path extending from the switching valve to the first friction engagement element.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: February 2, 1999
    Assignee: Denso Corporation
    Inventors: Akira Takagi, Shinya Sakaguchi, Kazushi Nakatani
  • Patent number: 5836845
    Abstract: Hydraulic pressure applied to an LR/B is controlled by a first solenoid valve when a forward-movement range is selected, and is controlled by a second solenoid valve when a backward-movement range is selected. In addition, in the forward-movement range, the second solenoid valve controls hydraulic pressure applied to an OD/C which couples at a different gear position from the LR/B. When both solenoid valves fall into non-excitation states due to the breaking of an electric signal line, the failure of an AT ECU or the like, the output hydraulic pressures of the solenoid valves is held high and low, respectively. Therefore, even in this case, double coupling of the LR/B and the OD/C can be prevented in the forward-movement range as well as a predetermined gear position can be established in each of the forward-movement range and the backward-movement range.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: November 17, 1998
    Assignee: Denso Corporation
    Inventors: Shinya Sakaguchi, Akira Takagi
  • Patent number: 5779377
    Abstract: A printing apparatus comprises: a print head comprising an array having an N (N=positive integer) number of dot forming elements arrayed at fixed pitches having a lower end and an upper end; a horizontal scan driver for moving the print head above and along a print medium in a horizontal scan direction; a vertical scan driver for moving the print medium in a vertical scan direction perpendicular to the horizontal scan direction, wherein a vertical scan distance that the print medium is vertically moved when the vertical scan driver is driven one time is selected such that the position of at least one dot forming element, counted from the lower end of the array of the print head in the drive of a horizontal scan is coincident with the position at least one dot forming element, counted from the upper end of the array of the print head in the drive of the horizontal scan drive after a given number of horizontal scan drives; and a head driver for performing a printing operation by intermittently driving the dot f
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: July 14, 1998
    Assignee: Seiko Epson Corporation
    Inventors: Eiji Kumai, Akira Takagi, Satoshi Fujioka
  • Patent number: 5701982
    Abstract: A lockup control system for an automatic transmission is provided with an electromagnetic valve 11 and a spool valve 13. When the electromagnetic valve 11 is inactive, the spool valve 13 is set so that a pressure at an OFF port 171 of a torque converter 12 is higher than that of an ON port 172, thereby opening a lockup clutch mechanism 19. When the electromagnetic valve 11 is activated, its control pressure Pc becomes lower than a secondary pressure PL2and the spool valve 13 is actuated so that the control pressure Pc is supplied to a clutch control chamber 18. As a result, the lockup clutch mechanism 19 is closed, thereby setting the lockup state. At this time, the control pressure Pc acts directly on the clutch control oil chamber 18, so that the lockup clutch mechanism 19 is controlled with high precision.
    Type: Grant
    Filed: July 10, 1995
    Date of Patent: December 30, 1997
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kazushi Nakatani, Akira Takagi, Hajime Yokoyama
  • Patent number: 5686944
    Abstract: In an ink jet printer, a print head includes (N+1) nozzles arrayed in the paper feed direction. The distance between the adjacent nozzles is K times as long as the dot line pitch P. N and K are each an integer larger than 2, and mutually prime. The quantity of ink droplet discharged from each nozzle is adjusted so as to form on a print paper, dots each having the diameter at least 1.4 times as long as the dot line pitch. An interlaced print as the combination of a print of paths made by the N successive upper nozzles of the print head and a paper feed of N print line pitches is used for the print on the most part of the print paper. A minute-feed print as the combination of a print of paths made by the N successive upper or lower nozzles of the print head and a paper feed of one print line pitch is used for the print on the upper and lower end areas of the print paper that reject a perfect print by the interlaced print.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: November 11, 1997
    Assignee: Seiko Epson Corporation
    Inventors: Akira Takagi, Hiroaki Tojo, Shoichi Hiraide
  • Patent number: 5544538
    Abstract: A vehicular automatic transmission (AT) hydraulic controller has an integrated valve. The integrated valve has a cylindrical cam shaft including convex and concave parts on the outer periphery thereof, and the integrated valve is connected to a motor for automatic control and a connecting part which is interlocked with an external gearshift operated by a driver. Hydraulic control of the integrated valve can be performed in two different ways, i.e., automatic control and manual control, and even if automatic control malfunctions due to an error, manual control can maintain the control of the AT and avoid any inconvenience. The structure of this integrated valve provides a high degree of design freedom and can implement a wide variety of AT functions. Accordingly, a light, compact and reliable AT equipped with both an automatic control mechanism and a manual control mechanism can be provided.
    Type: Grant
    Filed: June 3, 1994
    Date of Patent: August 13, 1996
    Assignee: Nippondenso Co., Ltd.
    Inventors: Akira Takagi, Fumiaki Murakami, Masami Fujutsuna, Kazuyuki Natsume, Masaru Suzuki, Toshihiro Takei
  • Patent number: 5255019
    Abstract: In an ink near-end detecting device, a pair of electrodes are arranged in the porous material in the ink tank and in the ink pool provided below the ink tank, respectively, so that the time instant the ink in the porous material has been nearly used up is detected from the variation of the electrical resistance between the electrodes with the consumption of the ink in the porous material.
    Type: Grant
    Filed: August 7, 1991
    Date of Patent: October 19, 1993
    Assignee: Seiko Epson Corporation
    Inventors: Seiji Mochizuki, Takahiro Naka, Kazuhiko Hara, Akira Takagi, Yukihiro Hanaoka
  • Patent number: 5225948
    Abstract: An automatic cassette loader/unloader loads and unloads a magnetic tape cassette into and from a magnetic recorder/reproducer such as a video tape recorder. The automatic cassette loader/unloader includes a cassette holder for holding a magnetic tape cassette therein. The cassette holder, with the magnetic tape cassette held therein, is movable into and out of the magnetic recorder/reproducer. A cassette discharge mechanism removes the tape cassette from the cassette holder which has been moved out of the magnetic recorder/reproducer. A cassette supply mechanism places a tape cassette into the cassette holder which is empty and has been moved out of the magnetic recorder/reproducer.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: July 6, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Kouhei Yamashita, Akira Takagi
  • Patent number: 5149005
    Abstract: A magnetic tape wind-up method comprises the steps of winding up a magnetic tape around a hub, which is incorporated in a cassette case, while the magnetic tape is being moved and is in contact with a contact member provided in the cassette case. The magnetic tape is wound up while a gas is being blown against the contact member or against a portion of the magnetic tape, which portion is present in the vicinity of the contact member, in such a way that the gas flows between the contact member and the magnetic tape.
    Type: Grant
    Filed: October 29, 1991
    Date of Patent: September 22, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akira Takagi, Masao Tsuruta, Akihisa Kita, Shingo Sawahara
  • Patent number: 5136503
    Abstract: A machine translation system for automatically effecting translation from Japanese the source language into another or target language. Conventional translation systems entail problems, e.g., the reduction in processing efficiency owing to the need for an additional step such as pre-editing prior to translation.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: August 4, 1992
    Assignee: Kabushiki Kaisha CSK
    Inventors: Akira Takagi, Jun Takada, Minoru Yukawa
  • Patent number: 5070346
    Abstract: In an ink near-end detecting device, a pair of electrodes are arranged in the porous material in the ink tank and in the ink pool provided below the ink tank, respectively, so that the time instant the ink in the porous material has been nearly used up is detected from the variation of the electrical resistance between the electrodes with the consumption of the ink in the porous material.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: December 3, 1991
    Assignee: Seiko Epson Corporation
    Inventors: Seiji Mochizuki, Takahiro Naka, Kazuhiko Hara, Akira Takagi, Yukihiro Hanaoka
  • Patent number: 5043649
    Abstract: A stepping motor unit includes a stepping motor of the type wherein the interior of the stepping motor is filled with an oil, a detector for detecting the temperature of the oil in the stepping motor, a device for varying an upper limiting value of the rotational speed of the stepping motor and an upper limiting value of the rotational acceleration of the stepping motor in view of a current viscous condition of the oil based on the temperature detected by the temperature detector, and a driver for driving the stepping motor at a rotational speed and a rotational acceleration which fall in ranges, respectively, not exceeding the upper limiting values. The stepping motor unit thus constructed has rapid and accurate response characteristics and is capable of operating reliably without falling out of step even when the environmental temperature varies in a very wide range. A rotary control valve incorporating such stepping motor unit is also disclosed.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: August 27, 1991
    Assignee: Nippondenso Co., Ltd.
    Inventors: Fumiaki Murakami, Masahiko Suzuki, Masatoshi Kuroyanagi, Jirou Asai, Yoshimi Natsume, Akira Takagi, Kiyomitsu Kozawa
  • Patent number: 4875647
    Abstract: A cable tie includes an elongated strap and a buckle connected to one end of the strap and having an aperture for receiving the other end of the strap. Preferably, the strap has adjacent the buckle a connecting portion which has a width less than that of the remaining portion of the strap. In an alternative form of the invention, the strap has a plurality of spaced-apart projections formed on and extending longitudinally on the opposite side surfaces thereof except a connecting portion adjacent the buckle. In a further modification of the invention, the strap has a series of ridges formed on and extending longitudinally on a bundle engaging surface. The ridges are adapted to prevent slipping movements between the strap and the bundle in both longitudinal and circumferential directions of the bundle of wires or the like.
    Type: Grant
    Filed: April 21, 1988
    Date of Patent: October 24, 1989
    Assignee: Daiwa Kasei Kogyo Kabushiki Kausha
    Inventors: Akira Takagi, Hirotsugu Oyaizu, Nobuatsu Takahashi, Kiyotaka Kume
  • Patent number: 4871616
    Abstract: A surface-treated poly methyl silsesquioxane powder characterized by surface-treatment with an agent comprising a compound which has at least two radicals attached to a metal atom or a silcon atom, said radical is selected from the group consisting of a hydroxyl radical, a hydrolyzable radical and a monovalent hydrocarbon radical substituted by a polar group.
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: October 3, 1989
    Assignee: Toshiba Silicone Co., Ltd.
    Inventors: Hiroshi Kimura, Akira Takagi
  • Patent number: 4858265
    Abstract: An apparatus for cleaning the edges of a magnetic tape cut into final-product widths from a wide raw material web with which magnetic powder shed from the tape and base film dust breaking off in the cutting process are removed without damage to the tape. The apparatus includes an air bearing guide for floating the magnetic tape as it is transported thereon, a cleaning device positioned at a side of the guide and making contact with at least one edge of the magnetic tape, and a magnet device for urging the edge of the tape into close contact with the cleaning device.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: August 22, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akihiro Suzuki, Akira Takagi
  • Patent number: 4817884
    Abstract: A tape winding device in which a tape is wound onto a reel. A magnetic field is applied to the tape during winding in a direction oblique to the axis of rotation and thus to the tape thickness whereby the tape is evened up to the flange of the reel.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: April 4, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masaaki Sakaguchi, Mitsunobu Usui, Akira Takagi
  • Patent number: 4796824
    Abstract: A magnetic tape winder in which a magnetic tape is wound onto a flanged reel which being subjected to a magnetic field in the width direction of the tape. The reel is fit between the poles of a U-shaped magnet.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: January 10, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Chikamasa, Akira Takagi, Masaaki Sakaguchi
  • Patent number: 4738330
    Abstract: A hydraulic drive system for use with a vehicle power steering pump has a hydraulic motor connected in series with a power steering mechanism and a bypass line extending in bypassing relationship with the motor. A bypass valve is disposed in the bypass line to control the flow through the bypass line such that, when a steering force applied to a vehicle steering wheel is increased, the bypass flow is substantially in proportion to the steering force.
    Type: Grant
    Filed: March 20, 1986
    Date of Patent: April 19, 1988
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masahiko Suzuki, Hiroshi Iwata, Kazuma Matsui, Akira Takagi, Yasuhiro Horiuchi, Kougorou Nakagawa, Toshiki Sugiyama
  • Patent number: 4472227
    Abstract: A process for producing an oriented composite polyolefin resin film which comprises melt-laminating a polyolefin resin sheet for a paper-like layer on at least one surface of a monoaxially stretched polyolefin resin sheet for a substrate layer, and then stretching the resulting laminated sheet in a direction perpendicular to said monoaxially stretched direction. The polyolefin resin sheet for the substrate layer is a sheet of composite structure prepared by melt-extruding the specific compositions (A), (B), and (C) through a co-extrusion die in such a manner that a layer composed of the thermoplastic resin composition (A) is laminated on one surface of an intermediate layer composed of the polyolefin composition (B) containing a filler and a layer composed of the thermoplastic resin composition (C) is laminated on the other surface of the intermediate layer. Said polyolefin resin sheet for the paper-like layer is composed of a specific polyolefin composition (D) containing a filler.
    Type: Grant
    Filed: May 4, 1982
    Date of Patent: September 18, 1984
    Assignee: Oji Yuka Goseishi Kabushiki Kaisha
    Inventors: Takashi Toyoda, Yozo Ohba, Kanji Shirai, Akira Takagi, Masaaki Yamanaka