Patents by Inventor Shun-ichi Nagai

Shun-ichi Nagai 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: 4246523
    Abstract: Disclosed is a brake timing control method and apparatus for use with a press machine including a press slide driven through a crank shaft by a variable speed motor to stop the moving press slide at its top dead center regardless of the speed of rotation of the crank shaft. The motor speed is detected and converted into a voltage proportional to the motor speed which is then integrated as a first voltage. A second voltage is provided in accordance with a line or curve representing as a function of motor speed the approximation of the slip angle through which the crank shaft will continue to rotate after braking is initiated. The first and second voltages are additively combined and compared with a reference voltage to provide a stop signal for initiating braking on the press machine when the sum of the first and second voltages reaches the reference voltage.
    Type: Grant
    Filed: November 28, 1978
    Date of Patent: January 20, 1981
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Shun-ichi Nagai