KS-0303 adopts link-feed mechanism; it is durable, feed balance expanded catalogue of sewing materials and larger potential shift in the thick seam of material. In the sewing process can send fluxes on the lower reach consensus, using a large hook, reducing the times of changing the bottom line, improve work efficiency; It applies with automatic lubrication equipment, increasing the machine’s using time. It can be used for sewing medium-heavy materials, bags, leather clothes and leather products.