Patents by Inventor Jakob Stapfer

Jakob Stapfer 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).

  • Open-end yarn piecer
    Patent number: 4689945
    Abstract: The starting or re-piecing of a yarn in an open end spinning machine is accomplished during full speed rotation of the spinning unit. A travelling piecer provides a fixed length of yarn to be back-fed into the spinning unit. A control which is responsive to the speed of rotation of the spinning unit causes the nip rolls to close together in order to deliver the new yarn from the spinning unit at the operating speed of the spinning unit.
    Type: Grant
    Filed: May 18, 1984
    Date of Patent: September 1, 1987
    Assignee: Rieter Machine Works, Ltd.
    Inventors: Andre Lattion, Jurg Bischofberger, Walter Salvik, Jakob Stapfer, Manfred Schreiber
  • Open-end yarn piecer
    Patent number: 4656824
    Abstract: The travelling piecer is provided with a threading pin which moves through an endless path in order to thread a seed yarn through the nip rolls of a spinning station and a yarn reserve forming device.The yarn centering mechanism employing a pair of pivotally mounted guide arms is used to position an accessible length of seed yarn in a position to be taken up by the threading pin.
    Type: Grant
    Filed: May 18, 1984
    Date of Patent: April 14, 1987
    Assignee: Rieter Machine Works, Ltd.
    Inventor: Jakob Stapfer