To arrange a fiber bundle in flat state and a state in which flat face is kept along arranging face when yarn comprising fiber bundles is arranged in folded state between pins arranged at a prescribed pitch on a supporting member to form a laminated yarn group.
A yarn feed head 3 and an air cylinder 12 are fixed to a support 10 fixed to a robot arm 5 and the yarn feed head 3 is equipped with a support cylindrical part 8 and a yarn guide pipe 9 rotatably attached at the tip. A pressing plate 4 is fixed at the tip of a piston rod 12a of the air cylinder 12 and en ultrasonic wave oscillator 13 is fixed on the pressing plate 4. The pressing plate 4 is arranged at a pressing position for pressing yarn R fed out from the yarn guide pipe 9 to an arranging face side and a waiting position incapable of engaging with the yarn R. When the yarn R fed out from the yarn guide pipe 9 is moved along the arranging direction of yarn R while pressing the yarn R by the pressing plate 4, the yarn R is spread and a flat face is arranged in a state parallel to the arranging face.
YASUI YOSHIHARU