product features: this machine adopts two straight needles, vertical automatic refueling rotary hook line and sliding lever thread take-up, constitute, the second thread lock stitch. The needle bar adopts mechanical type separation and joint, and the upper and lower shaft adopts flow bead bearing, synchronous belt drive, piston type oil pump lubrication system, and the feeding mode of feeding and feeding with the needle bar swing and feeding, the rotary dial gauge and the lever type reverse feeding structure. Within the core of the suture back to pull the spring, to ensure that the bottom line and the line to get the same results. With double needleseparationtype lever structure, sewing, sharp corner. Is suitable for underwear, jeans, men and women's clothes, the corner of the sewing and decorative sewing.