Sis 810/820 model hiagh head thick material machine adopts single straight needle, sliding rod line, vertical rotating shuttle to hook the line, forming the double lock line mark, the vertical axis uses the spiral bevel gear rotation. Adopting sets up pole seaming and rolling presser foot, which can make the zizag seaming conveniently, is suitable for the leather shoes, the leather shoes, the handbag similar goods corner sewing.