Conveyor device (1) including an endless conveyor belt (4), a first drive (3) for driving the endless conveyor belt (4), a main frame (2) and an auxiliary frame (19) supported in the main frame (2), a second drive (15) for moving the auxiliary frame (19) back and forth relative to the main frame (2) in the manner of a shuttle-conveyor, such that a supply track (4a) of endless conveyor belt (4) supported by the auxiliary frame (19) can feed products (P) on a discharge track (4b) of endless conveyor belt (4) supported by the main frame (2).