Grinder

1. A grinder, for use in grinding coffee beans, comprising:

a first grinding element; and

a second grinding element, wherein the two grinding elements are rotatable relative to one another, in such a way that coffee beans are ground by the grinding elements into a coffee powder, and

an entrainer wheel rotatable with the first grinding element, said entrainer wheel being used to convey, on its edge region, the ground coffee powder out of the grinder via an exit channel,

wherein the edge region of the entrainer wheel is constituted tapered towards the grinding elements with a concave profile (h(r)), in such a way that an inner high edge (Ri) and an outer low edge (Ra) are formed, and the entrainer wheel comprises a plurality of entrainer vanes distributed in the edge region over the periphery.

2. The grinder according to claim 1 , wherein the entrainer vanes are orientated radially on the entrainer wheel.

3. The grinder according to claim 1 , wherein the entrainer vanes are distributed over the periphery at a regular distance from one another.

4. The grinder according to claim 1 , wherein a gap is provided between each entrainer vane and the inner high edge (Ri), in such a way that an exit gap for the ground coffee powder constituted between the first grinding element and the second grinding element emerges into the gap, wherein the gap is used to take over the ground coffee powder directly.

5. The grinder according to claim 1 , wherein the entrainer vanes are constituted essentially cuboid.

6. The grinder according to claim 1 , wherein the height of the entrainer vanes corresponds to the height of the inner edge (Ri).

7. The grinder according to claim 1 , wherein the concave profile (h(r)) is circular in cross-section.

8. The grinder according to claim 7 , wherein the circular radius of the concave profile (h(r)) corresponds to the distance between the inner edge (Ri) and the outer edge (Ra).

9. The grinder according to claim 1 , wherein the concave profile (h(r)) is hyperbolic in cross-section.

10. The grinder according to claim 1 , wherein the exit channel is formed in such a way that its height essentially corresponds to the height of the entrainer wheel and its width essentially corresponds to the distance between two entrainer vanes.

11. The grinder according to claim 2 , wherein the entrainer vanes are distributed over the periphery at a regular distance from one another.

12. The grinder according to claim 1 , wherein the concave profile (h(r)) is parabolic in cross-section.

13. A grinder, for use in grinding coffee beans, comprising:

a first grinding element;

a second grinding element, wherein the two grinding elements are rotatable relative to one another to be configured to grind coffee beans by the grinding elements into a coffee powder; and

an entrainer wheel rotatable with the first grinding element, said entrainer wheel configured to convey, on its edge region, the ground coffee powder out of the grinder via an exit channel,

wherein the edge region of the entrainer wheel is tapered towards the grinding elements with a concave profile (h(r)), in such a way that an inner high edge (Ri) and an outer low edge (Ra) are formed, and the entrainer wheel comprises a plurality of entrainer vanes distributed in the edge region over the periphery,

wherein a gap is provided between each entrainer vane and the inner high edge, in such a way that an exit gap is configured from which the ground coffee powder constituted between the first grinding element and the second grinding element emerges, wherein the gap is configured to take over the ground coffee powder directly, and

wherein the exit channel is formed in such a way that its height corresponds to the height of the entrainer wheel and its width corresponds to the distance between two entrainer vanes.

14. The grinder according to claim 13 , wherein the entrainer vanes are orientated radially on the entrainer wheel.

15. The grinder according to claim 13 , wherein the height of the entrainer vanes corresponds to the height of the inner edge (Ri).

16. The grinder according to claim 13 , wherein the concave profile (h(r)) is circular in cross-section.

17. The grinder according to claim 16 , wherein the circular radius of the concave profile (h(r)) corresponds to the distance between the inner edge (Ri) and the outer edge (Ra).

18. The grinder according to claim 13 , wherein the concave profile (h(r)) is hyperbolic in cross-section.

19. A grinder, for use in grinding coffee beans, comprising:

a first grinding element;

a second grinding element, wherein the two grinding elements are rotatable relative to one another to be configured to grind coffee beans by the grinding elements into a coffee powder; and

an entrainer wheel rotatable with the first grinding element, said entrainer wheel configured to convey, on its edge region, the ground coffee powder out of the grinder via an exit channel,

wherein the edge region of the entrainer wheel is tapered towards the grinding elements with a concave profile (h(r)), in such a way that an inner high edge (Ri) and an outer low edge (Ra) are formed, and the entrainer wheel comprises a plurality of entrainer vanes distributed in the edge region over the periphery,

wherein the entrainer vanes are orientated radially on the entrainer wheel, and

wherein the height of the entrainer vanes corresponds to the height of the inner edge (Ri).

20. The grinder according to claim 19 , wherein the entrainer vanes are distributed over the periphery at a regular distance from one another.