To prevent a yarn from being cut, when the yarn is pinched and fed between the outer circumferential face of a drive rotor constituted of a roller and the outer circumferential face of a driven rotor constituted of a roller or a belt, after the yarn is set at first.

After a yarn Y is so set as to pass between both outer circumferential faces 21a, 22a separated from each other, the yarn is fed by being pressurized with the outer circumferential face 21a of a driven rotor 22 approaching to the outer circumferential face 21a of a drive rotor 21 so as to be rotated. After the yarn Y is so set as to pass through a position outside a pinching position of the both outer circumferential faces 21a, 22a rotated in their press contacted state, the yarn Y is shifted to the pinch position of the both outer circumferential faces 21a, 22a so as to be fed.