An overlocker sews over the edge of one or two pieces of fabric for edging, hemming, or seaming. Usually an overlocker will cut the edges of the cloth as they are fed through. The automatic cutters create finished seams easily and quickly. An overlocker differs from a normal sewing machine in that it uses loopers fed by multiple thread cones rather than a bobbin. Loopers serve to create thread loops that pass from the needle thread to the edges of the fabric so that the edges of the fabric are contained within the seam.. Overlock stitches are extremely versatile, as they can be used for decoration, reinforcement, or construction.