Patents by Inventor Hansruedi Fehr

Hansruedi Fehr 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).

  • Device for assisting the transfer of a fleece from the card main cylinder to the doffer roll
    Patent number: 5144723
    Abstract: In order to optimally control the air supply in a diverging gap between a card main cylinder and a doffer roll, an air guide plate with a predetermined spacing on the narrowest part between the air guide plate and the surface of the main cylinder and with an aperture angle is arranged close to the main cylinder so that a converging gap is provided between the air guide plate and the surface of the main cylinder. In this converging gap, a pressure head builds up in operation through the air conveyed from the surface of the main cylinder, which leads to an overflow over a nose of the air guide plate. This overflow helps the fleece, which is loosened from the main cylinder, to more easily reach the doffer surface. In order to control the quantity of overflowing air, the gap is to be determined by trial.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: September 8, 1992
    Assignee: Maschinenfabrik Rieter AG
    Inventors: Erich Hohloch, Hansruedi Fehr