Patents by Inventor Karl-Dieter Schopf

Karl-Dieter Schopf 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).

  • Sewing machine with a needle bar mounted in a swinging frame
    Patent number: 4981093
    Abstract: A sewing machine has a needle bar, which is mounted in a frame, a continuously operating feed device for the workpiece, a looper which reciprocates transversely to the workpiece feed direction, a spindle which is mounted in the sewing machine arm, and a cam, which is disposed on the arm spindle in order to swing the frame in the workpiece feed direction. The frame is driven in dependence upon the movement of the arm spindle by way of a positively connected transmission. Two cams permit optimum adaptation of the swinging movement of the frame to the continuously moving workpiece.
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: January 1, 1991
    Assignee: Union Special G.m.b.H.
    Inventor: Karl-Dieter Schopf