upstream portion of the accumulation surface 27 at this time the control unit 28 is waiting for the strip 34 of sensors to indicate that the accumulation is at least increased again upstream from the fill threshold sensor 34 b to authorize the restarting of the feed conveyor 6 and the braking track belts 5 fig4 c that makes it possible to guarantee that no u201c gap u201d arrives at the fault sensor 34 c during the first transfer cycle an absence of u201c gaps u201d between the overfill sensors 34 a and the fill threshold sensor 34 b indicates that the overspeed of the intermediate conveyor 4 must be increased this overspeed can be increased as long as the manipulation head 17 comes back into initial position a before the objects 1 are detected by the sensor 26 on the other hand an excess of u201c gaps u201d between the overfill sensor 34 a and the fill threshold sensor 34 b indicates an excessive overspeed that can be reduced to limit friction on the mat of the intermediate conveyor 4 it is understood that the intermediate accumulation device 33 upstream from the feed conveyor 6 can have numerous variants for example the upstream braking track belts 5 can be replaced with an object blocker situated on the upstream intermediate conveyor 4 this blocker can consist of mobile lateral guides pressing the objects 1 laterally a diverter can then guide the objects 1 onto the feed conveyor 6 when they are released by the blocker using fig5 a to 5 c an output device 35 will be described that comprises an intermediate accumulation means 36 located between the output conveyor 8 and.