Patents by Inventor Willi Stephan

Willi Stephan 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: 4573421
    Abstract: A device for use with a sewing machine for making garments with pleats operates with a folded-over workpiece which is advanced past a reciprocating sewing needle and includes a pleating bar assembly which is insertable between the folds of the material and includes portions which engage against the folds of the material to hold a pleat in position while it is moved by a feed pressure member into a sewing position. The pleating bar assembly includes a supporting member such as a shaft or a rod having pleat members with bearing portions which are rotatable on the support member to permit the plates to be held in position and to be collapsed for bringing the pleat to a sewing position. The material is held by needle or pin members which engage into the material as it is fed into the sewing position.
    Type: Grant
    Filed: June 14, 1985
    Date of Patent: March 4, 1986
    Assignee: Pfaff Industriemaschinen GmbH
    Inventors: Gunther Mall, Herbert Dietrich, Willi Stephan
  • Patent number: 4418629
    Abstract: A device for making darts on cut parts for use with a sewing machine which has a reciprocating needle mounted over a support table for engagement with the material to be sewn and wherein the material to be sewn is moved along the table by a feeding mechanism, comprises, a pleating bar support plate which is mounted for movement around the needle and carries a pleating bar which is movable therewith for adjustable positioning in respect to the table. The support plate for the pleating bar may be adjustably positioned and the limit of its adjustment is governed by a stop which is adjustably positionable relative to the support plate. The stop advantageously comprises a rotatable multi-step stop which is carried on a lever arm so that it may be shifted relative to the support plate. The lever arm is advantageously biased in a direction so that the stop engages the support plate. The lever is connected with a drive device for effecting its adjustment.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: December 6, 1983
    Assignee: Pfaff Industriemaschinen GmbH
    Inventors: Gunther Mall, Willi Stephan