Patent ID: 7779870

Claim:
A method for producing a reinforcing fiber woven fabric in which a reinforcing fiber is a carbon fiber having a number of filaments of 6000 to 50000 and is woven as at least a warp, the method comprising reciprocating a plurality of cylindrical bodies in the direction of the warp of the woven fabric on the woven fabric which is not impregnated with resin such that the cylindrical bodies are rolled in a pressurization state to the woven fabric to widen the yarn width at least of the warp constituting the woven fabric in the direction of a weft, wherein a guide roller is rotatably brought into contact with a surface of the reinforcing woven fabric continuously passing through at a predetermined winding angle, the plurality of cylindrical bodies are rotatably supported on the woven fabric which is brought into contact with a surface of the guide roller.