Patents by Inventor Tuyoshi Yamaguchi

Tuyoshi Yamaguchi 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).

  • CNC apparatus for controlling a plurality of machines
    Patent number: 5266878
    Abstract: A main CPU unit and a plurality of CNC units provided on a one-to-one correspondence with machine tools, and the main CPU unit is connected with an external storage device and an input device. To modify the mode of machine tool control or machining data of work, a new system program is down-loaded through the RAM of the main CPU unit into the CPU for the CNC unit, and according to this new system program, the part program including machining data normally stored in the CPU for the CNC unit.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: November 30, 1993
    Assignee: Hitachi Seiko Ltd.
    Inventors: Toshiyuki Makino, Tuyoshi Yamaguchi
  • Method of and apparatus for machining printed circuit board
    Patent number: 5123789
    Abstract: A method of and apparatus for effecting a machining operation, e.g. drilling, on a multi-layered printed circuit board utilizing a machining apparatus having a spindle for driving a tool. The spindle is movable in the axial direction of the tool and a pressure foot for pressing the printed circuit board during the machining is mounted on the spindle for relative movement with respect thereto. The method includes the steps of determining the position of the end of a tool with respect to the end of a pressure foot in the state before the pressure foot contacts the printed circuit board, setting the amount of relative movement between the pressure foot and the tool necessary for effecting the desired machining, on the basis of the position of the end of the tool and a predetermined set value of the machining depth; and effecting the machining on the printed circuit board by controlling the feed of the tool in conformity with the amount of relative movement.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: June 23, 1992
    Assignee: Hitachi Seiko, Ltd.
    Inventors: Tamio Ohtani, Yasuhiko Kanaya, Tuyoshi Yamaguchi
  • Apparatus for producing foamed plastic insulated wires
    Patent number: 4099897
    Abstract: An extrusion apparatus and method for producing foamed resin coatings on a wire. A foaming agent and molten resin are poured into a supply portion of an extruding screw and cylinder apparatus. The screw in the supply portion is tapered in the down stream direction. The screw and cylinder apparatus portion adjacent to the supply portion is arranged to blend the resin and foaming agent and has a lower coefficient of extrusion than the supply portion. The metering portion of the screw and cylinder apparatus is adjacent and down stream of the blend portion and has a higher coefficient of extrusion than the blend portion.
    Type: Grant
    Filed: November 4, 1975
    Date of Patent: July 11, 1978
    Assignee: Hitachi Cable, Ltd.
    Inventors: Hideo Takano, Satoshi Saito, Tadashi Sato, Tuyoshi Yamaguchi, Yoshihiro Narita