The comb-shaped roller is also called a comb-type cleaning roller. It is specifically used in conveyor lines for transporting sticky materials. Elastic cleaning ring-shaped drums are installed at intervals on the roller surface for cleaning sticky substances on the carrying surface of the conveyor belt. The comb-shaped idler automatically cleans materials adhering to the return belt to remove fine particles or powdery materials adhering to the belt surface, effectively preventing belt deviation caused by them.