Patents by Inventor Yasunori Segawa

Yasunori Segawa 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).

  • Method and apparatus for controlling motor-driven chucking device
    Patent number: 6463835
    Abstract: A method and apparatus for controlling a motor-driven chucking device which are capable of delicately controlling the workpiece gripping force, the travel speed of gripping jaws, and so forth. The method controls a motor-driven chucking device in which gripping jaws of a chuck provided on a main spindle rotatably supported by a headstock of a machine tool are opened or closed by a torque controllable driving motor to grip a workpiece. The method includes the steps of inputting a set value for gripping force with which the gripping jaws grip the workpiece, and opening or closing the gripping jaws by controlling rotation of the driving motor according to the set value for the gripping force.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: October 15, 2002
    Assignee: Hitachi Seiki Co., Ltd.
    Inventors: Yasunori Segawa, Toru Ogawa