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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 5 Thread Serger - This machine is in the expensive range but has all the seam capabilities you could want. 3 threads are used on the overlocked edge and 2 are used for the straight seam line. This is the seam you see on ready-mades that have a overlocked edge with the straight seam having a chain stitch.