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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.
NEEDLES. Diagram Source: http://en.wikipedia.org/wiki/Sewing_machine_needle. Whether you use a regular sewing machine, serger or cover stitch machine needle choice is important. There are a lot of different types of needle points, you can find more detailed information about them in this Threads article.iagram Source: http://en.wikipedia.org/wiki/Sewing_machine_needle. Whether you use a regular sewing machine, serger or cover stitch machine needle choice is important. There are a lot of different types of needle points, you can find more detailed information about them in this Threads article.