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With this two button control puller lifting, and backtacking.Three cams all together with machine, can be change cam at the back side，servo motor driving and control pneumatic foot lifting, pneumatic backtack, pneumatic puller lifting

This series machine adopts connecting rod to take-up thread and shuttle to gook thread. The needle is vertical to puncture mechanism. It is a kind of long-arm zigzag sewing machine for extremely thick materials. Spacious operation table is suitable for sewing large objects easily. In addition, synchronous wheels make it more stable and stronger feeding power for the purpose of multilayer thick materials sewing. At the same time, stitch of the machine is accurate and beautiful. It also adopts imported large-scale special type shuttle hook that has a large amount of bobbin thread with high sewing efficiency, applicable for thick materials such as tent, sails, leather, seat cushion, sofa, luggage and edge seam.