Patents by Inventor Raffaele Prina

Raffaele Prina 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).

  • Chaining-off device for multiple needle chainstitch sewing machines
    Patent number: 5027728
    Abstract: A device for forming a thread chain on a multiple-needle chainstitch sewing machine having at least two sewing needles, a looper, a needle plate having at least two needle hole slots and a stitch formation tongue disposed between the needle hole slots, and a feed device comprising a feed dog and a presser foot, and a sewing thread brake device disposed beneath the stitch formation tongue beyond the sewing needles in the direction of sewing. The device brakes the sewing threads, and deflects them in such a way that a thread chain is formed.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: July 2, 1991
    Assignee: Union Special G.m.b.H.
    Inventor: Raffaele Prina