Disclosed is a conveyor device for conveying along a conveyor plane, in order to transform a wide flow of products into a downstream single-file flow, including an intake conveyor, suitable for conveying the wide flow, an output conveyor suitable for conveying the single-file flow, an acceleration conveyor positioned between the intake conveyor and the outlet conveyor and including a plurality of conveyor units with a speed gradient, and also including a guide for guiding the products transversely from the intake conveyor to the outlet conveyor and positioned downstream from the flow of products so that the products are moved against same under the effect of the consecutive conveyors. Also disclosed is a corresponding method.