Vibrating Needle Patents (Class 112/109)
  • Patent number: 4296697
    Abstract: A sewing machine for wrapping button shanks comprises a holder for a workpiece to which a button is attached by means of shank loops. To adjust the work holder to the length of the shank loops, two spaced apart holding elements are provided by which the work is separated from the button and which can be positioned at the desired distance from each other. To cut the sewing thread, a cutting blade is displaceable in one of the holding elements and the cutting edge of the blade is movable transversely to the needle path, between the inserted shank loops and a rotary hook.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: October 27, 1981
    Assignee: Pfaff Industriemaschinen GmbH
    Inventors: Karl Barth, Ernst Albrecht, Horst Stahlschmitt