Programmed pressure foot positioning for control means sewing machine

摘要

A sound of percussion or impact which is produced as a result of a vertical movement of a pressure foot driven in synchronism with a vertical movement of a sewing needle is eliminated. A sphere 15 exposed through the lower surface of a pressure foot 10 as well as a coiled compression spring 16 which urges the sphere are provided, so that the resilience of the spring is effective to suppress a vertical movement of the fabric while allowing a movement of a fabric 9 in a horizontal plane, thus eliminating the need for a vertical movement of the pressure foot as the needle is driven up and down. Alternatively, an independent drive source may be provided to move the pressure foot in synchronism with the vertical motion of the needle through a minimized stroke.