pinion 34 is thus transmitted to the drum 32 by the intermediary of the satellites 35 in its rotation the drum 32 sets into motion the belt 22 by adhesion in an advantageous manner the linear speed and the adhesion of the belts 22 of the extractor are greater than those of the belts 13 of the plates 2 this difference in speed is linked to the different winding radii of the belts 22 on the wheels 38 the crowns 39 on these same wheels 38 and on the rollers 23 as well as the diameter of the rollers 23 that drives the belts 13 by friction in the following the function of this extractor is described during the different phases of removal of the objects for a better readability a single belt 22 of the slide valve 21 is shown at rest the extractor is in the configuration shown in fig8 for the removal of an object a senestrorsum rotation of the motor shaft 24 drives by the intermediary of the system of the free wheel 25 a rotation of very limited amplitude of the crown 26 and the displacement of the cable 27 which generates the output of the slide valve 21 in the direction of the stocking plate 2.