The machine is equipped with a hook-driving shaft-offset mechanism which plaes the hook-rotating shart off-center from the center of zigzag stroke of the needle. This mechanism allows the blade point of the hook to catch the needle thread every time regardless of the needle throwing dirction. As a result, this machine is immune to sewing troubes, such as stitch skipping and thread breakage, annoyances likely to occur with the conventional machine, especially when the needle throws to the right. The standard zigzag stitching machine creates softly finished seams. The needle rocking mechanism is provided with a triangular cam which helps produce beautiful seams with consistency. JUK2280N and JUK2281N can be used for lockstitch, simple zigzag and embroidery stitch.