Such machinery feature humanized design, super-wide working space and easy taking and feeding of sewing materials and can make sewing operations easy and handy. They have many kinds of intelligent sewing modes, like automatic needle stopping, automatic thread cutting, automatic thread-wiping, automatic needle positioning, automatic stitch-set sewing and automatic bartacking. They feature high efficiency, energy conservation, handiness, wide application scope and beautiful stitches. Due to their reliable and stable thread cutting operation, such machinery can meet requirements on cutting of threads of different kinds and different diameters. They have been applied for the national patent.