1. Composition of material feeding & buffering control adjustment mechanism, adjustable width side seam sewing, variable cutting length control, horizontal transmission synchronization control mechanism, auto thread trimming cross sewing, and back & forth discharging transmission mechanism, to form the auto 4-side overlock sewing machine.

2. Overlock sewing mechanism: symmetric left right overlock machine heads, sewing and cutting in a whole, machine head with auto lubrication, with suction device to collect back the waste material.

3. Adjustable stitch length, from the range of 2-5 mm. Not require mechanical adjustment on sewing device.

4. Bobbin thread and upper thread broken detection, thread broken then machine automatic stopped.

5. High precision roller with rubber covering, guarantee fabric transmission smoothly.

6. Machine modular design, multiple components combination, coordinated work on all sections.

7. Able to connect subsequently with mass volume production line, more automatic and intelligent manufacturing.

8. Moving parts are isolated with machinery protection mesh for safety.