This machine adopts two straight needles, vertical-axis rotating hook with self-lubricating feature of catching thread loops and sliding cam take-up to produce two lines of double lockstitches. The needle bar can be engaged and disengaged mechanically and the arm shaft and hook shaft are supported by ball bearings. It is provided with synchro tooth belt for driving and plunger pump for lubricating, and knob-type stitch regulator and lever-type reverse feeding mechanism. A bobbin thread pullback spring in the bobbin case guarantees the harmony between needle thread and bobbin thread. Besides it features synchronized feeding of needle bar and feed dog. It is recommended for stitching overalls, uniforms, jeans and decorative sewing on bags.
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