Patent ID: 6499415
Filing Date: 2002-12-31
Classification: D05B

Abstract:
An improved zigzag sewing machine with a walking foot capable of sewing heavy material having a main crank shaft coupled to a primary lift shaft and to a primary feed shaft and further having a feed dog for feeding a workpiece across a workpiece supporting surface in which the feed dog is mounted, and further comprising a needle bat assembly, having a needle plate through which the needle is driven, a hook and bobbin assembly beneath the workpiece supporting surface which moves with the needle bar assembly, and has a needle stroke take-up spring and a walking presser foot having an outer walking foot and an inner presser foot, said apparatus comprising a needle bar drive assembly having an increased needle stroke providing for penetration and removal of the needle from heavy material, an enlarged opening in the needle plate avoiding all needle strikes, means for holding the fabric on said workpiece supporting surface fore and aft said enlarged opening, whereby penetration of the fabric and withdrawal from the fabric can be accomplished without drawing the fabric into the opening of said needle plate.