... in two inches, moving range is 2 inches at right side and left side, Reck up to 1/4, 1/2needle at ... motor ,main roller and sub roller can open and close automaticallyflank tension has 12 pieces both in right and left sideAutomatic stop under yarn ... breakage, knot, yarn up, reverse rolling, piece count end, needle strike, reck not returned, and shock act, and ...