Patents by Inventor Yoshio Shiramasa

Yoshio Shiramasa 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).

  • Workpiece transfer apparatus
    Patent number: 5901624
    Abstract: An apparatus for transferring workpieces to and from the chuck of a machine tool. A gripper arm is mounted to the machine frame for selectively axial and rotational movement on a shaft having helical and longitudinal threads on the surface thereof. A first nut is rotatably mounted to the machine frame for axial advancement of the shaft and a second nut is rotatably mounted for rotational advancement. The apparatus may also include a panel mounted to the machine frame between a transfer station and the chuck. An opening in the panel adjacent the transfer station has surfaces which mate with corresponding surfaces of the gripper arm so as to preclude the passage of debris to the transfer station. The apparatus may also include an apparatus for sequentially transferring a series of workpieces. The apparatus has a two gripper jaws and a compressible pusher plate therebetween which is compressed as it is moved towards an opening in an input chute so that a workpiece may roll between the jaws of the gripper.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: May 11, 1999
    Assignee: Kitagawa Iron Works Co., Ltd.
    Inventor: Yoshio Shiramasa
  • Workpiece transfer apparatus
    Patent number: 5782151
    Abstract: An apparatus for transferring workpieces to and from the chuck of a machine tool. A gripper arm is mounted to the machine frame for selectively axial and rotational movement on a shaft having helical and longitudinal threads on the surface thereof. A first nut is rotatably mounted to the machine frame for axial advancement of the shaft and a second nut is rotatably mounted for rotational advancement. The apparatus may also include a panel mounted to the machine frame between a transfer station and the chuck. An opening in the panel adjacent the transfer station has surfaces which mate with corresponding surfaces of the gripper arm so as to preclude the passage of debris to the transfer station. The apparatus may also include an apparatus for sequentially transferring a series of workpieces. The apparatus has a two gripper jaws and a compressible pusher plate therebetween which is compressed as it is moved towards an opening in an input chute so that a workpiece may roll between the jaws of the gripper.
    Type: Grant
    Filed: August 7, 1995
    Date of Patent: July 21, 1998
    Assignee: Kitagawa Iron Works Co., Ltd.
    Inventor: Yoshio Shiramasa