a rotor shearing type crusher for crushing municipal waste and industrial waste whether it is bulky or not . if any foreign material , which is impossible to crush , is mixed with the municipal waste or industrial waste , the foreign material is promptly discriminated and discharged separately . the crusher includes a casing , a feed plate and a cutter respectively rotatably mounted to the casing obliquely above two rotatable knives . the inclination of the feed plate and cutter can be changed freely . cutouts rae provided on the top end of the feed plate and cutter in a comb - like manner to dodge cutting edges of the rotatable knives intersecting each other . a discharge port is divided into two sections . the crusher of such a construction performs a function of tearing off soft waste twining itself around the rotatable knives . rigid material impossible to be crushed is separately discharged . even dangerous small waste such as cartridges , cylinders , etc . can be crushed and degassed inside without fail . bulky material is pushed and crushed and bitten into . as a result of such a construction , advantages such as less machine trouble , high productivity and long life of the rotatable knives are assured .