Sewing machine feed tooth pattern How to choose?

Sewing machine feed dog has a single long tooth-and double-long teeth of two types: When using a single long-toothed feed dog, the main rely on the left side of a single row of teeth and the pressure foot long "bite" fabric by press the shape of the foot and the feed teeth with the teeth of various curved or arcuate lines are sewn, it will operate a flexible and convenient, so most of the domestic household sewing type JA and JB type) priority is equipped with a single long tooth feed dog .

     However, its disadvantage is that the sewing machine when sewing multiple layers of fabric or heavy materials, there will be poor directional stability wrong and sewing material layer fight big problems. Sometimes in order to ensure the zigzag stitch, patchwork, sewing and other sewing requirements, we should double long feed dogs. If you want to change the dual mono long-toothed long teeth type, you must also replace long-toothed double needle plate and the presser foot, the screws and mounting dimensions are common.