Patents by Inventor Fritz Witte

Fritz Witte 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: 10910956
    Abstract: A method is provided for operating a frequency converter, which is designed to drive a three-phase motor, wherein the frequency converter has three half-bridges each having at least two switches. The method includes the following steps: generating three phase voltages for the three-phase motor by a pulse width modulation, wherein, for the pulse width modulation, various switching patterns of the switches are activated, wherein specific star point voltages ensue for various groups of switching patterns; and in at least one operating state of the frequency converter, within a respective period of the pulse width modulation, activating only those switching patterns in which an identical star point voltage ensues.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: February 2, 2021
    Assignee: Lenze Automation GmbH
    Inventors: Fritz Witte, Thomas Petersen, Dirk Duesterberg
  • Publication number: 20180219493
    Abstract: A method is provided for operating a frequency converter, which is designed to drive a three-phase motor, wherein the frequency converter has three half-bridges each having at least two switches. The method includes the following steps: generating three phase voltages for the three-phase motor by a pulse width modulation, wherein, for the pulse width modulation, various switching patterns of the switches are activated, wherein specific star point voltages ensue for various groups of switching patterns; and in at least one operating state of the frequency converter, within a respective period of the pulse width modulation, activating only those switching patterns in which an identical star point voltage ensues.
    Type: Application
    Filed: July 19, 2016
    Publication date: August 2, 2018
    Inventors: Fritz WITTE, Thomas PETERSEN, Dirk DUESTERBERG
  • Publication number: 20040052615
    Abstract: The invention relates to a methods and devices for bending wire binding elements that are used in a wire comb binding. According to various aspects of the invention, methods and devices are provided for bending wire binding elements that are adapted in particular to varying thicknesses of stacks of sheet-form printing materials, preferably without retooling.
    Type: Application
    Filed: May 22, 2003
    Publication date: March 18, 2004
    Inventors: Ferdinand Fuchs, Hartmut Reusch, Fritz Witte, Hans-Peter Wurschum
  • Patent number: 5657658
    Abstract: An apparatus which is used to impart a specific configuration to substantially flat elongated strips of deformable wire binding elements for stacks of overlapping perforated sheets or the like has a transporting unit serving to advance binding elements lengthwise in a predetermined direction along an elongated path, a unit which converts strips in a first portion of the path into transversely curved intermediate products having a substantially C-shaped cross-sectional outline and a shape which at least approximates the predetermined configuration, and an altering unit which serves to deform--in a second portion of the path downstream of the first portion--at least those intermediate products the shape of which departs from the predetermined configuration.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: August 19, 1997
    Assignee: Womako Maschinenkonstruktionen GmbH
    Inventor: Fritz Witte
  • Patent number: 4612963
    Abstract: A machine wherein wire is being withdrawn from a reel or barrel by a wire comb forming unit which draws the wire at a given frequency has a lever which is pivoted at such frequency by a rotary cam and carries a first roller. The lever is pivotable about the axis of a second roller and the wire is trained first over the second roller and thereupon around the first roller on its way toward the wire comb forming unit. The pivoting lever ensures that the wire is drawn from the reel or barrel at a constant speed in spite of intermittent consumption of wire in the wire comb forming unit. The diameters of the two rollers are the same.
    Type: Grant
    Filed: February 9, 1984
    Date of Patent: September 23, 1986
    Assignee: Womako Maschinenkonstruktionen GmbH
    Inventor: Fritz Witte
  • Patent number: 4513794
    Abstract: A machine for converting straightened wire into an elongated undulate comb-like product wherein hairpin-shaped prongs alternate with webs which extend in the longitudinal direction of the product has two carriers which are rotatable about parallel axes and have neighboring end faces defining a forming channel. Each carrier supports a group of equidistant tools which are reciprocable in parallelism with and are equidistant from the axis of the respective carrier. The carriers are alternately indexed in opposite directions, and the wire is fed into the channel by a pivotable portion of a wire feeding unit so that it is alternately engaged by successive tools of the one and the other carrier.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: April 30, 1985
    Assignee: Womako Maschinenkonstruktionen GmbH
    Inventor: Fritz Witte