1  connecting rod upper and lower feed mechanism and presser foot alternately lifting mechanism to ensure smooth feeding;
2  using a large rotating hook to reduce the number of replacement bottom;
3  with automatic lubrication devices at speeds up to 3500 rev / min;
4  using the latest sewing structure, to achieve the advantages of the low-tension sewing;
5  presser foot lift and the presser foot shaft swing shaft is sealed automatic lubrication;
6  the rear cover using heightening effective to prevent oil spills;
7  compared to the previous 0303-D3 PC synchronization sewing machine sewing thick good performance.
8  with automatic thread trimmer, automatic back-tack, electronic clamp function, increased operating efficiency and reduce labor costs.