The model uses a connecting rod feeding structure, good durability, feeding balance, the bulk of the type of slag and SU- bmersible large seam in the sewing process, in the sewing process can make the upper and lower layers of feed to achieve the same. The use of bullt-in integrated computer control technology, stable performance, anti-interference ability. The use of new curved hook line to form a single chain chain stitch, without changing the bottom line, improve work efficiency: the use of automatic lubrication device to improve the service life of the machine. With automatic needle, automatic needle number, automatic thread trimming, electronic clip, automatic lfting feet and lfting towel wheel device and other intelligent sewing mode. Applicable to sewing thick material, luggage, leather, leather products, sofas.