Suitable for medium-weight materials such as: diving suits, aerobic clothing, artificial leather bags, shoes, cylindershaped stitches, etc. 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. The diameter of the cylinder is only 42MM which widens variability of sewing applications. Zigzagging stitches with 3 or 4 points strengthens stability of stitching rows