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Unlike standard lockstitching, which uses a bobbin, overlock sewing machines utilize loopers to create thread loops for the needle to pass through, in a manner similar to crocheting. Merrow's original three-thread overedge sewing machine is the forerunner of contemporary overlocking machines.
normal denim sewing machines were not designed for these heavier threads. WHAT DETERMINES THE THREAD SIZE THAT CAN BE SEWN ON A SEWING MACHINE? On 301 lockstitch machines, the maximum needle thread size that can be sewn is usually determined by the capacity of the hook or shuttle in the machine, and the size of the needle being used.