Rotor assembly for an agricultural baler

1. A rotor assembly for an agricultural baler, the rotor assembly comprising:

a rotor shaft having a central portion and first and second end portions on either side of the central portion; and

a plurality of tine plates arranged axially along the rotor shaft, each of the tine plates comprising at least one tine,

wherein the tine plates are arranged such that there is an angular spacing between the at least one tine of adjacent ones of the tine plates, and

wherein a magnitude of the angular spacing between the tines of adjacent tine plates varies across a length of a first end portion from the central portion to a first end of the rotor shaft, such that the magnitude of the angular spacing between adjacent tines in the first shaft section increases or decreases along the length of the first end portion from the central portion to the first end of the rotor shaft.

2. The rotor assembly according to claim 1 , wherein:

the magnitude of the angular spacing is greater at the central portion than at the first and second end portions and decreases from the central portion to the first and second end portions, or

the magnitude of the angular spacing is smaller at the central portion than at the first and second end portions and increases from the central portion to the first and second end portions.

3. The rotor assembly according to claim 2 , wherein the decrease or increase in the angular spacing is monotonic.

4. The rotor assembly according to claim 1 , wherein each of the tines comprises a tip, and wherein the tips of the tines define a first curve between the central portion and the first end portion and a second curve between the central portion and the second end portion.

5. The rotor assembly according to claim 4 , wherein the first and second curves are quadratic curves.

6. The rotor assembly according to claim 4 , wherein the first curve has no extrema between the central portion and the first end portion, and wherein the second curve has no extrema between the central portion and the second end portion.

7. The rotor assembly according to claim 4 , wherein the first and second curves form a corner at the central portion.

8. The rotor assembly according to claim 4 , wherein there is a phase difference between the first and second curves at the central portion.

9. The rotor assembly according to claim 4 , wherein the tips of the tines define a plurality of first curves in series between the central portion and the first end portion in a circumferential segment of the rotor shaft, and wherein the tips of the tines define a plurality of second curves in series between the central portion and the second end portion in the circumferential segment of the rotor shaft.

10. The rotor assembly according to claim 4 , wherein each of the tine plates comprising a plurality of tines spaced angularly apart, wherein the tine plates are arranged such that the tips of the tines define a plurality of first curves or a plurality of second curves in an axial segment of the rotor shaft.

11. The rotor assembly according to claim 1 , further comprising first and second end plates at the first and second end portions, respectively, of the rotor shaft, the first and second end plates each comprising a tine, wherein the first and second end plates are arranged such that their tines are adjacent to the tines of the adjacent tine plates.

12. The rotor assembly according to claim 1 , wherein the tine plates are spaced equidistantly along the rotor shaft.

13. The rotor assembly according to claim 1 , wherein the tines of adjacent ones of the tine plates are of different length.

14. The rotor assembly according to claim 1 , wherein an angular orientation of the tine plates is adjustable to adjust the angular spacing between the tines of adjacent ones of the tine plates.

15. An agricultural baler comprising a rotor assembly comprising:

a rotor shaft having a central portion and first and second end portions on either side of the central portion; and

a plurality of tine plates arranged axially along the rotor shaft, each of the tine plates comprising at least one tine,

wherein the tine plates are arranged such that there is an angular spacing between the at least one tine of adjacent ones of the tine plates, and

wherein a magnitude of the angular spacing between the tines of adjacent tine plates varies across a length of a first end portion from the central portion to a first end of the rotor shaft, such that the magnitude of the angular spacing between adjacent tines in the first shaft section increases or decreases along the length of the first end portion from the central portion to the first end of the rotor shaft.

16. The agricultural baler according to claim 15 , wherein:

the magnitude of the angular spacing is greater at the central portion than at the first and second end portions and decreases from the central portion to the first and second end portions, or

the magnitude of the angular spacing is smaller at the central portion than at the first and second end portions and increases from the central portion to the first and second end portions.

17. The agricultural baler according to claim 16 , wherein the decrease or increase in the angular spacing is monotonic.

18. The agricultural baler according to claim 15 , wherein each of the tines comprises a tip, and wherein the tips of the tines define a first curve between the central portion and the first end portion and a second curve between the central portion and the second end portion.

19. The agricultural baler according to claim 18 , wherein the first and second curves are quadratic curves.

20. The agricultural baler according to claim 19 , wherein the first curve has no extrema between the central portion and the first end portion, and wherein the second curve has no extrema between the central portion and the second end portion.