Unit for sorting moving parts

A unit for sorting moving parts on a conveyor belt (2), comprising a parts transfer device (3) that is capable of extracting from said conveyor belt parts selectively identified as non-compliant, the parts transfer device comprising a roller (31) that is capable of being mounted so as to be transversely rotatable above said conveyor belt, and a plurality of gripping tools (32) which extend radially at the periphery of said roller and are capable of each selectively removing one part from said conveyor belt when they are brought into a removal position defined by a first angular position of said roller, and of releasing said removed part when they are brought into a release position defined by a second angular position of said roller, each gripping tool (32) comprising a suction cup (321) that is fixed on a tubular support sleeve (322) which is mounted on said roller (31) and leads into the inside of said roller (31), said tubular support sleeve (322) defining an inner duct that is provided with a lateral opening (322c) capable of establishing communication between said suction cup and a main chamber (312) arranged inside said roller that is kept under depression with respect to the ambient air, characterized in that all the suction cups (321) brought into the removal position are placed under depression, each tubular support sleeve (322) being mounted so as to be movable in translation according to the axis thereof through a wall (311) of said roller, an actuator (34) being capable of selectively commanding, in said removal position, the movement of said tubular support sleeve (322) in the direction of said conveyor belt, such that said suction cup (321) comes into engagement with said part to be removed.