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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.
are purchasing these types of machines so they can. sew extra large thread sizes up to Tex 500 or Tex. 600 thread sizes. Another option for sewing heavy threads on 301 lockstitch machines is to sew the heavy. thread in the bobbin and using a regular size thread in the needle.