Patents by Inventor Harald Collbrunn

Harald Collbrunn 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).

  • Patent number: 4227471
    Abstract: A system for the edge-parallel sewing of a workpiece, consisting of a plurality of layers, together to form a seam, e.g. in the production of trouser legs, pockets, shirts and the like, comprises a workpiece guide in the region of the needle path and formed with separators interposed between the layers, and a drag-clamping device which engages a portion of the stack of fabric layers remote from the incipient stitching operation to apply a stretching or drag force thereto. According to the invention, a retracting device is provided which, upon approach of the drag clamp to the stitching location, withdraws the guide device out of the path of the clamp.
    Type: Grant
    Filed: June 9, 1978
    Date of Patent: October 14, 1980
    Assignee: Durkoppwerke GmbH Bielefeld
    Inventors: Harald Collbrunn, Franz Hannemann, Heinz Fransing
  • Patent number: 4102281
    Abstract: A workpiece guide device for sewing machines, especially for the edge-true seaming of at least two workpiece (fabric) pieces, e.g. trouser parts, on a sewing machine, comprises a vertically disposed linear-guide element on the sewing table for alignment of the edges of the pieces to be guided horizontally, and a three-plate stack extending generally transversely to the plane of the linear edge guide and mounted upon a slide for movement toward and away from the stitching location. Preferably clamping means is provided to engage the fabric pieces between the plates.
    Type: Grant
    Filed: December 2, 1976
    Date of Patent: July 25, 1978
    Assignee: Durkoppwerke GmbH
    Inventors: Harald Collbrunn, Hermann Breitinger, Herbert Diekmann