Patents by Inventor Keizo Tawara

Keizo Tawara 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).

  • Residual bobbin thread amount detecting apparatus for a sewing machine
    Patent number: 5161475
    Abstract: A residual bobbin thread amount detection apparatus for a sewing machine which includes a hook rotating in association with a main shaft of the sewing machine and a bobbin rotatably mounted on the hook. A first detector detects the rotation speed of the main shaft and a second detector detects the rotation speed of the bobbin. A comparator responsive to the second detector generates a signal when the rotation speed of the bobbin exceeds a predetermined value, whereby a controller operates an alarm.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: November 10, 1992
    Assignee: Juki Corporation
    Inventors: Keizo Tawara, Kazuya Tami, Osamu Tachikawa