Sorting unit for belt conveyor systems

A sorting unit for a belt conveyor system of the type comprising at least a sorting conveyor belt extending between transmission rollers revolvingly supported by a bar hinged to a steady framework, said sorting belt being swingable about an oscillation axis extending parallelly and close to a longitudinal edge actuating means to operate the sorting conveyor belt and control means for oscillating the sorting conveyor belt about said oscillation axis, bringing it from a rest position, where it lays horizontally flush with further conveyor belts being parts of said conveyor system, to a delivery position where it is transversally sloped downwardly, and viceversa, characterized in that said actuating means comprise an actuating belt extending parallelly to said oscillation axis and running in a direction opposite to the advancing direction of an object, at least one driving roller axially coupled to one of said transmission rollers and revolvingly arranged above said actuating belt, friction-coupled thereto my means of two counter-rollers located underneath said actuating belt in a position symmetrical with respect to the tangency line of said driving roller in such a way to assure in the rest position, the presence of a friction strength between the actuating belt and the driving roller.