heavy duty union feed sewing machine

1. Powerful unison feed, the machine can sew over multiple pile of materials easily. 2. Applied the semi-rotary large shuttle and bobbin, can reduce the frequency of changing the bobbin and thread, and increase the sewing efficiency 3.The sewing area is up to 320 mm, suitable for stitching very huge articles. 4. It can add or change the parts and accessories to stitch the 1-needdle moccasin, the binding operation etc. 5. Suitalbe stitching all the extra heavy-weight materials , such as the handle of bags , golves, safety belts, tents , seatings, shoes, bags..... etc.