Patents by Inventor Dieter Lengsfeld

Dieter Lengsfeld 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: 5975746
    Abstract: The invention pertains to a process for monitoring bar cutoff on CNC-controlled automatic bar lathes having a main spindle (3), an auxiliary spindle (6) and a pull-away carriage (WS3). In cutting-off operations it is necessary to monitor whether the cutting-off operation has cleanly severed the workpiece from the unmachined part. This control prevents machine damage that could arise as a result of imperfectly severed workpieces. The invention provides that after the cutting-off operation is completed, the pull-away carriage is started in the direction of a predetermined control path. In the time the pull-away carriage moves along the control path, the contour variation is monitored and compared with a value for contour variation that was defined in no-load operation, i.e. without a workpiece. If upon comparison the contour variation exceeds a predetermine threshold of difference, i.e.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: November 2, 1999
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Dieter Lengsfeld