Patents by Inventor Hisao Hachisuka

Hisao Hachisuka 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).

  • Power supply unit for electrical discharge machine
    Patent number: 5162631
    Abstract: An electrical discharge machining power supply unit which detects fluctuations in the voltage of a DC power source (3) and sends a signal to an A/D converter (5) and has a microprocessing unit (8) to change the on-time of a transistor switching element (12) in inverse proportion to the rate of voltage fluctuations computed by the microprocessing unit (8), thereby maintaining the voltage supplied across the electrode (1) and workpiece (2). In a second embodiment a pilot power supply and a current detecting element for detecting a dielectric breakdown of the gap is used.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: November 10, 1992
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Hisao Hachisuka, Akihiro Komori