Fiber width adjustment device, fiber width adjustment method and composite material molding method

A fiber width adjustment device comprising:

• a feeder configured to feed a tape material in a length direction of the tape material, the feeder including at least one roller, the tape material including fibers for a fiber reinforced resin after or before the fibers are impregnated with a resin;
• and
• an adjuster having a path for the tape material, the path being formed by at least a bottom and a pair of wall surfaces, an interval of the wall surfaces decreasing gradually, a width of the tape material which passed the path being changed by adjusting a part of the path, the tape material passing through the part of the path while contacting with the bottom and the wall surfaces,
• wherein the adjuster changes the width of the tape material by adjusting a position at which the tape material, which has contacted with the bottom and the wall surfaces, departs from the bottom and the wall surfaces, the bottom having a convex surface, and
• wherein the adjuster adjusts the position, at which the tape material departs, by moving the path in a direction parallel to a thickness direction of the tape material, the path being moved relatively to the tape material.