Producing device and producing method for chopped fiber bundles, producing device and producing method for fiber-reinforced resin forming materials, cutting blade for carbon fiber bundles, and rotary cutter for carbon fiber bundles

A producing method for chopped fiber bundles comprising:

• supplying a plurality of long fiber bundles arranged in parallel with each other to a chopper unit comprising a rotary cutter for cutting a plurality of the long fiber bundles with a traveling direction of a plurality of the long fiber bundles orthogonal to a rotation axis of the rotary cutter;
• restricting each of a plurality of the long fiber bundles supplied to the chopper unit by using a comb guide from moving relative to the comb guide in a direction parallel to the rotation axis of the rotary cutter;
• widening the width of each of the long fiber bundles by a scratch bar, provided between the chopper unit and the comb guide, to provide plurality of widened long fiber bundles;
• and
• producing chopped fiber bundles by cutting the widened of long fiber bundles with the chopper unit.