Center knife drive for an agricultural harvester

1. A header for an agricultural harvester comprising:

a frame;

an epicyclical drive supported by the frame, the epicyclical drive including:

a first rotatable wheel having a first substantially vertical rotational axis, and

a first disk having a first eccentric axis rotatable about the first substantially vertical rotational axis, wherein operation of the epicyclical drive results in oscillating motion of the first disk in a direction transverse to the first substantially vertical rotational axis; and

a first cutter bar directly connected to the first disk extending in a direction substantially transverse to the first substantially vertical rotational axis.

2. The header of claim 1 , wherein the epicyclical drive further includes:

a second rotatable wheel having a second substantially vertical rotational axis; and

a second disk having a second eccentric axis rotatable about the second substantially vertical rotational axis, wherein operation of the epicyclical drive results in oscillating motion of the second disk in a direction transverse to the second substantially vertical rotational axis; and

wherein the header further comprises a second cutter bar directly connected to the second disk extending in a direction substantially transverse to the second substantially vertical rotational axis.

3. The header of claim 1 , wherein the epicyclical drive is mounted centrally along the frame.

4. The header of claim 2 , wherein the second substantially vertical rotational axis is substantially parallel to and spaced from the first substantially vertical rotational axis.

5. The header of claim 2 , wherein the first and second disks are configured to oscillate in opposing directions.

6. The header of claim 1 , wherein the first rotatable wheel is adjacent to the first cutter bar.

7. The header of claim 2 , wherein the first and second disks oscillate in a direction along a single plane.

8. The header of claim 2 , wherein the first substantially vertical rotational axis of the first rotatable wheel is parallel to the first eccentric axis of the first disk, and wherein the second substantially vertical rotational axis of the second rotatable wheel is parallel to the second eccentric axis of the second disk.

9. The header of claim 1 , wherein the first eccentric axis is substantially vertical.

10. The header of claim 2 , wherein the second rotatable wheel is adjacent the first rotatable wheel.

11. The header of claim 1 , further comprising a central cutter bar adjacent the epicyclical drive.

12. The header of claim 11 , wherein the central cutter bar has a longitudinal extent greater than a width of the epicyclical drive and positioned between the first and second cutter bars.

13. The header of claim 1 , wherein the first rotatable wheel is adjacent to the first cutter bar.

14. The header of claim 1 , wherein the epicyclical drive faces an upwardly direction.

15. The header of claim 1 , further comprising a conveyor supported by the frame, and wherein the epicyclical drive is positioned between the first cutter bar and the conveyor.

16. The header of claim 15 , wherein the conveyor is an infeed draper conveyor or a lateral draper conveyor.

17. The header of claim 2 , wherein the epicyclical drive includes a drive mechanism extending between and operatively engaged with the first and second rotatable wheels.

18. The header of claim 17 , wherein the drive mechanism includes a drive shaft engaged with a first driven gear operatively connected to the first rotatable wheel and a second driven gear operatively connected to the second rotatable wheel.

19. The header of claim 1 , wherein the first rotatable wheel is substantially inline with a longitudinal axis of the first cutter bar.

20. The header of claim 11 , wherein the central cutter bar is positioned below the first cutter bar.