Such machinery have adopted the compound synchronous feeding of the machine needle, presser food and feed dog. The enlarged needle bar stroke and the pressure lifting amount make the feeding performances better. The stitches are even and beautiful. They can be widely used for the sewing of all kinds of materials, like the leather. The design of the cylinder-type needle plate makes it possible to sew the 40mm ring products. Due to the adoption of safety devices, when threads are stuck, the clutch can stop working automatically to prevent the accidental damage of the rotating hooks. The front end of the cylinder machine head has adopted the knockdown machine cover structure, which can carried out cleaning and maintenance to the machine simply. The adoption of the double-large rotating hook thread-hooking reduces the replacement times of the bottom threads and greatly improves the work efficiency. They are applicable to the sewing of cylinder articles and widely used for the sewing of the garments, cases, leather, footwear and car covers
