Characteristics : 1. Sewing and trimming can be done at the same time. 2. When turning the knob up, the fabric trimmer will stop its function. As a result, the machine can be treated as an ordinary lockstitch machine. 3. The movement of the fabric trimmer is special designed. Providing more safety protections to the operator. 4. The extended devices can cover all functions for auto trimming type. (Auto trimming, backstitch, thread wiping, and presser foot lifting.) 5 . The overcasting is available by attaching related devices.