可在这些机器上使用
j 、除了expression 3.2, 3.0 ,2.0， 150
other information
when sewing free-motion at a low speed the presser foot will raise and lower with each stitch to hold the fabric on the stitch plate while stitch is being formed. at higher speed, the presser foot floats over the fabric while sewing.
substantially increases your work area.