Working with an overlocker means saving time and stitching fast. Sewing projects take shape quickly and with little effort.An overlock sewing machine, or serger as it is commonly known, can trim, stitch, and overcast seams as they sew. They can also be used for applications such as inserting a zipper and creating beautiful decorations with certain stitches.sewing machine, any of various machines for stitching material (such as cloth or leather), usually having a needle and shuttle to carry thread and powered by treadle, waterpower, or electricity. It was the first widely distributed mechanical home appliance and has been an important industrial machine.