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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.
A 2-4 Thread serger - This machine has the capabilities of a true safety stitch and a two thread overlocked edge. Two threads are used on each operation and you can use the machine to create each stitch separately from the other. A 3-4 Thread Serger - A...MORE machine which can function with 3 or 4 threads.