Patents by Inventor Akira NAWAHARA

Akira NAWAHARA 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: 20210053142
    Abstract: An expulsion sensing device includes a spot welding device 2 that pressurizes, via a pair of electrodes 33 and 34, a workpiece W in which a plurality of metal plate members is superposed and welds the workpiece W by passing electricity between the pair of electrodes 33 and 34 while maintaining a predetermined pressurizing force, an operation control unit 42 that detects an interelectrode distance between the pair of electrodes 33 and 34 at predetermined time intervals, a calculation unit 51 that detects a temporal change rate of the detected interelectrode distance, and a determination circuit unit 52 that determines occurrence of expulsion when the detected change rate in an approaching direction of the pair of electrodes 33 and 34 is equal to or more than a predetermined threshold
    Type: Application
    Filed: February 7, 2019
    Publication date: February 25, 2021
    Inventors: Akira NAWAHARA, Daisuke NAKAZAKI