Fibre cutting knife

The utility model discloses a fibre cutting knife, including being used for the cover at the ring ontology and the C font cutting knife that have a breach on the finger, the first end of cutting knife is fixed on ring ontology's outer wall, leaves the pan feeding clearance between second end and ring ontology's outer wall, this cutting knife includes the back of a knife blade and towards ring ontology's border, this border including the blunt edge that lies in second end department with lie in blunt edge and first end between sharp edge, being equipped with the rubber inner circle on ring ontology's the inner wall and locating a plurality of elastic bulge that circle in the rubber, the full -filling has the glue film between rubber inner circle and ring ontology's the inner wall. The utility model discloses can overlap on operator's finger and not influence regular operation, also can overlap or hang put equipment into production on to at any time, use and be difficult for losing, the ring ontology through having the breach simultaneously, rubber inner circle on the cooperation ring ontology inner wall and locate rubber in the elastic bulge that circles, finger that can the different operators of nimble adaptation.