Suitable for materials such as: tents, vehicle seats, artificial leather, bags, shoes, sport equipments, etc. Double presser feet synchronizes top-feed motion with bottom-feed motion, which assures the qualities of a flat, even and nice looking row of stitches. New mechanism of pendulous needle assures stability of each stroke. The design of fully automatic lubrication enforces an adequate amount of oil that results in smooth and quiet operation. The full-opening head's cover is good for easy machinery maintenance and repairing.