Object orienting machine

1. A machine for orienting objects, comprising:

a hopper for receiving the objects in bulk,

a belt conveyor with a plurality of blades to withdraw the objects from the hopper, the belt conveyor having an ascending length suitable to select the objects having a predetermined orientation, so that, at the upper end of the ascending length only the objects having all the same predetermined orientation are present on the belt conveyor,

an extraction device, arranged downstream of the ascending length of the belt conveyor, to extract the objects from the belt,

wherein the blades form a rest surface facing upwardly in the ascending length and having a plurality of projections suitable to prevent a free rolling of the objects rested on said rest surface; and

wherein the rest surface forms a plurality of cavities open on a side opposite the belt conveyor and open in a movement direction of the belt, wherein said projections form partition walls between two neighboring cavities.

2. The machine according to claim 1 , wherein the cavities widen from a minimum width adjacent to the belt conveyor up to a maximum width at a free edge of the blade.

3. The machine according to claim 1 , wherein the extraction device is configured to detach the objects from the rest surface in a detachment direction that substantially coincides with a movement direction of the belt conveyor at a detachment moment.

4. The machine according to claim 1 , wherein the extraction device is configured to detach the objects from the rest surface in a detachment direction transverse to a plane of the belt conveyor at a detachment moment.

5. The machine according to claim 1 , wherein the extraction device is configured to carry out detachment of the objects from the blades and withdrawal of the objects from the belt conveyor by gravitational fall of the objects.

6. A machine for orienting objects, comprising:

a hopper for receiving the objects in bulk,

a belt conveyor with a plurality of blades to withdraw the objects from the hopper, the belt conveyor having an ascending length suitable to select the objects having a predetermined orientation, so that, at the upper end of the ascending length only the objects having all the same predetermined orientation are present on the belt conveyor,

an extraction device, arranged downstream of the ascending length of the belt conveyor, to extract the objects from the belt,

wherein the blades form a rest surface facing upwardly in the ascending length and having a plurality of projections suitable to prevent a free rolling of the objects rested on said rest surface; and

wherein the projections of a same blade form a plurality of ribs that are substantially mutually parallel and extending in a direction perpendicular to a plane of the belt, as seen in the cross-section of the belt.

7. The machine according to claim 6 , wherein said ribs have a constant cross-sectional shape.

8. The machine according to claim 6 , wherein the ribs have a width decreasing from a maximum width at the belt up to a minimum width at a free edge of the blade.

9. The machine according to claim 6 , wherein the ribs are in a cross-sectional shape of:

a cusp with a rounded vertex facing a movement direction of the belt, or

trapezoidal with the minor base facing the movement direction of the belt, or

substantially rectangular.

10. The machine according to claim 6 , wherein the extraction device is configured to detach the objects from the rest surface in a detachment direction that substantially coincides with a movement direction of the belt conveyor at a detachment moment.

11. A machine for orienting objects, comprising:

a hopper for receiving the objects in bulk,

a belt conveyor with a plurality of blades to withdraw the objects from the hopper, the belt conveyor having an ascending length suitable to select the objects having a predetermined orientation, so that, at the upper end of the ascending length only the objects having all the same predetermined orientation are present on the belt conveyor,

an extraction device, arranged downstream of the ascending length of the belt conveyor, to extract the objects from the belt,

wherein the blades form a rest surface facing upwardly in the ascending length and having a plurality of ribs suitable to prevent a free rolling of the objects rested on said rest surface, and wherein the plurality of ribs are substantially mutually parallel and extend in a direction perpendicular to a plane of the belt, as seen in the cross-section of the belt.

12. The machine according to claim 6 , wherein the extraction device is configured to carry out detachment of the objects from the blades and withdrawal of the objects from the belt conveyor by gravitational fall of the objects.

13. A machine for orienting objects, comprising:

a hopper for receiving the objects in bulk,

a belt conveyor with a plurality of blades to withdraw the objects from the hopper, the belt conveyor having an ascending length suitable to select the objects having a predetermined orientation, so that, at the upper end of the ascending length only the objects having all the same predetermined orientation are present on the belt conveyor,

an extraction device, arranged downstream of the ascending length of the belt conveyor, to extract the objects from the belt,

wherein the blades form a rest surface facing upwardly in the ascending length, wherein the rest surface forms a plurality of cavities open on a side opposite the belt conveyor and open in a movement direction of the belt, said rest surface having a plurality of partition walls between two neighboring cavities suitable to prevent a free rolling of the objects rested on said rest surface.

14. The machine according to claim 6 , wherein the extraction device is configured to detach the objects from the rest surface in a detachment direction transverse to a plane of the belt conveyor at a detachment moment.