Presser foot automatic lifting device

摘要

A sewing machine with a workpiece feed comprises a feed dog positioned below the workpiece providing a four-motion feed movement. A presser foot is fixed to a presser foot bar and can be raised from the workpiece during the stitching cycle by a lifting gear to ensure turning of the workpiece. This makes it possible to follow complicated seam patterns. The lifting gear is constructed in such a way that the presser foot is raised from the workpiece while the needle perforates the material, during its downwardly directed movement approximately up to its bottom dead center position.