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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.
Sewing machine creating a lockstitch using Allen B Wilson's rotating hook. The lockstitch uses two threads, an upper and a lower. Lockstitch is so named because the two threads, upper and lower, lock (entwine) together in the hole in the fabric which they pass through.