On system Feed by needles and feed dog，can prevent the slide between the materials;
Adopt bobbin thread confirming window, can easily check the quantity of the bobbin thread;
Can adjust the tension of thread easily through the left and right self-govern spring;
With auto oil lubrication. Suit to process pants, jeans, work suits and luxury clothes.. 

Keywords：Lockstitch sewing machine,JA8450/JA8420-High Speed Double Needle Lockstitch Sewing,

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