This machine is a heavy duty compound feed lockstitch sewing machines, which is designed
with large vertical rotating hooks for thread loop catching and sliding
bars for thread uptaking. It has been sub-classed into single needle, two needle,
single needle with under-trimmer and two needle with undertrimmer.
The application of needle bearings for arm shaft and hook shaft, cog belt driving,
plunger pump lubrication and compound feed by needle bar, presser foot and feed
dog provides this series with such splendid features as smooth running, quiet
working and a long service life. It is also equipped with a safety clutch to prevent
the hooks from damage by over-duty operation. So it is especially available
in stitching car seat cushions, safety belts, safety air bags, tents, parachutes,
etc.
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