The use of a new type of double-point retrograde mechanism, with anti-wear characteristics, in the long-term use, still able to maintain accurate retractable seam head. The new type of sewing body, not only set the precision, and can easily adjust the forward seam and back seam of the sewing head size,and the reverse device, easy to operate easily. The use of integrated feeding, feeding strong, good durability, feeding balance, the bulk of the type of sewing materials and submersible large thick seam material, in the sewing process can make the upper and lower layers of feed to reach the same. The use of built-in servo motor direct drive to achieve the machine's fast start and brake accuracy; at the same time the use of advanced integrated computer control technology, stable performance, anti-interference ability, Using a large rotary hook, to reduce the number of bottom line, improve work efficiency;use of automatic lubrication device to improve the service life of the machine. With automatic needle, automatic needle number, automatic count down suture, automatic cut line, electronic thread, automatic pressure foot and other intelligent sewing mode. Applicable to sewing thick materials, bags,leather, leather products.