Patents by Inventor Gunnar Liebrandt

Gunnar Liebrandt 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: 4793158
    Abstract: A process and apparatus is disclosed for feeding weft threads to a warp knitting machine including longitudinal conveyors traveling towards the knitting instrumentalities. Weft thread rakes are arranged outside of the longitudinal conveyors and are movable between a starting position in which the weft threads are placed into the longitudinal conveyors and the rakes, and a racking position against the traveling direction of movement of the longitudinal conveyors. After reaching the racking position, the weft threads are transferred onto the longitudinal conveyors and the rakes are then returned to the starting position in the direction of travel of the longitudinal conveyors. The move of the rakes from the racking position to the starting position is effected by a temporary coupling connection of the rakes with the longitudinal conveyors. After transfer of the weft threads, this coupling connection is cancelled as the rakes reach the starting position.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: December 27, 1988
    Assignee: LIBA Maschinenfabrik GmbH
    Inventor: Gunnar Liebrandt
  • Patent number: 4018065
    Abstract: A driving apparatus for knitting implement bars of warp knitting machines, comprising a main shaft and several individually driven cam or crank discs each mounted on a separately supported axle. This arrangement permits a substantial reduction of size and weight of the driving mechanism as compared with usual drives consisting of a single shaft bearing the cam or crank discs.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: April 19, 1977
    Inventors: Gunnar Liebrandt, Adolf Hagel, Gerhard Gallwitz