用了调整容易的单针独调节式机构，防止跳针，针距有所改善，维持布不打皱，适用于休闲、牛仔装、衬衫圆筒二片合缝。Foreasy adjustment ofsingle needleonlyadjustablemechanism,preventskipping stitch,stitchhas improved,maintainclothwrinkle,suitable for casual,jeans,shirtcylindertwocommissure