1) Needle bar linkage up and bottom feed structure and presser foot alternating elevation to ensure smooth feed.

2) Adopt big hook to save the time of bottom line changing.

3) Automatic lubrication system, maximum speed up to 2000 rpm.

4) New sewing structure to ensure low tension sewing.

5) Automatic sealed lubrication in elevation axis and swing axis in presser foot.Heighten design in rear cover to avoid oil leakage?