Computer direct drive structure design, accurate needle stop, avoidbrake failure, can sew flat and triangular stitches, the stitches are firmand beautiful. High sewing speed, adjustable buttonhole length, widthand number of stitches, with automatic lubrication system and automaticthread trimming device. lt is suitable for the buttonhole stitching of allkinds of needlework, cotton spinning, chemical fiber and other fabricsIt is suitable for thin and medium-thick materials.