It will have something to do with your stitch length regulator,when
you adjust from zero and watch the feed dogs, you should see them move
as the number increases even when not sewing. Many machines whose feed dogs move back and forth but do not
rise have the basic cause broken gears. So take it to mechanic who can repair these gears
you adjust from zero and watch the feed dogs, you should see them move
as the number increases even when not sewing. Many machines whose feed dogs move back and forth but do not
rise have the basic cause broken gears. So take it to mechanic who can repair these gears