according to the invention, the cutting line has over lock sewing machine in the fracture line in order to save on the device and method. the products of sewing operation after fracture, the over lock sewing machine with tension fracture control button according to the applied force. according to the fracture line, maintain the constant tension control is the key of fracture line to relieve pressure. in fact, the ji ji to maintain tension in the control button of the clamping force of the soil fertility. at the same time, it is the pressure to stop. so, with the form of the chain type network is the number of fracture, relaxation will decrease, and the chain is in the form of network, used to reduce the amount of fracture. for the less of the fracture line include cutting, fracture line section.
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