Abstract: Closed conveyor belt with a housing (2) that encloses a conveyor belt (11) that can be set in motion by a drive, characterized in that both edges (22) of the conveyor belt (11), that extend in the direction of movement (P) of the conveyor belt, extend through the housing (2) by a protruding section (23) that extends through slots (24) provided to this end in the housing (2).