A light weight, compact roving cutter for chopping fiberglass roving into short fiber segments, and used in conjunction with a hand-held resin spray gun, has a mounting plate containing an air inlet port for driving an air motor carried thereon, a snap-on cutter rotor or roller driven by the air motor...http://www.google.es/patents/US4001935?utm_source=gb-gplus-sharePatente US4001935 - Roving cutter
