The machine adopts two straight needles vertical-axis raoting hook with self-lubricating feature for catching thread loop and sliding cam takeup to produce two lines of double lockstitch. The needle bar can be enlarged and disengaged mechanically and the arm shaft and hook shaft are supported by ball bearings. It is provided with synchronous tooth belt for driving and plunger pump for lubricatingm and knob-type stitch regulator and lever type reverse feeding mechanism. The sew thread pulls back spring in the bobbin case and guarantees the harmony between surface thread and buttom thread. Besides ut features synchronized feeding of needle bar and feeding dog. It is recommended for stitching overalls, unifiorms, jeans and decorative sewing on bags.
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