Hybrid disc cutting system having a knife mount for an agricultural vehicle

1. An agricultural vehicle, comprising:

a chassis; and

a header carried by the chassis, the header including a cutterbar with at least one cutting unit, the at least one cutting unit including:

a rotary driver;

a rotatable disc coupled to the rotary driver;

at least one knife mount coupled to a disc surface of the rotatable disc and including a locking portion biased toward the disc surface;

a knife locked in at least one direction by the locking portion; and

a knife slot comprising a pair of knife stops mounted to the disc surface, and a support surface connected to one or both of the pair of knife stops, the knife being held in the knife slot.

2. The agricultural of claim 1 , further

a guard assembly held adjacent to the rotatable disc and including a plurality of extensions, each of the extensions including a bottom portion and a top portion connected to the bottom portion to define a knife passage that allows the knife to rotate therethrough during a full rotation of the rotatable disc.

3. The agricultural vehicle of claim 2 , w herein the at least one knife mount includes a deflectable portion mounted to the disc surface and connected to the locking portion.

4. The agricultural vehicle of claim 3 , disc surface is a bottom surface of the rotatable disc.

5. The agricultural vehicle of claim 2 , wherein the knife has a locking opening formed therein and the locking portion comprises a locking projection at least partially filling the locking opening.

6. The agricultural vehicle of claim 2 , wherein the knife defines a knife thickness and the knife passage defines a passage height that is at least twice the knife thickness.

7. The agricultural vehicle of claim 1 , wherein the support surface has a through-hole formed therein that allows at least a portion of the at least one knife mount to extend therethrough.

8. The agricultural vehicle of claim 1 , further comprising a guard assembly held adjacent to the rotatable disc, the guard assembly including a plurality of extensions, each of the plurality of extensions having a bottom portion and a top portion connected to the bottom portion defining a passage height, wherein the passage height is about 1.5 to 2.0 times greater than a knife thickness of the knife.

9. The agricultural vehicle of claim 1 , further comprising a guard assembly held adjacent to the rotatable disc, the guard assembly including a curved base portion and a plurality of extensions extending from the curved base portion.

10. A header for an agricultural vehicle, comprising:

a header frame;

a rotary driver carried by the header frame;

a rotatable disc coupled to the rotary driver;

at least one knife mount coupled to a disc surface of the rotatable disc and having a locking portion biased toward the disc surface to lock a knife in at least one direction; and

a guard assembly held adjacent to the rotatable disc, the guard assembly including a curved base portion and a plurality of extensions extending from the base portion, each of the plurality of extensions including a bottom portion and a top portion connected to the bottom portion to define a knife passage.

11. The agricultural vehicle of claim 10 , wherein the at least one knife mount includes a deflectable portion mounted to the disc surface and connected to the locking portion.

12. The agricultural vehicle of claim 11 , wherein the disc surface is a bottom surface of the rotatable disc.

13. The agricultural vehicle of claim 10 , wherein the locking portion includes a locking projection.

14. The agricultural vehicle of claim 10 , further comprising a support surface connected to at least one of the knife stops, the support surface having a through-hole formed therein that allows at least some of the locking portion to extend therethrough.

15. A method of mounting a knife in a header for an agricultural vehicle, the header including a rotatable disc and a knife mount coupled to the rotatable disc, the method comprising:

forcing a locking portion of the knife mount away from a disc surface of the rotatable disc, the locking portion being biased toward the disc surface;

placing the knife adjacent to the disc surface and within a knife slot defined by a pair of stops and a support extending between the pair of stops; and

releasing the locking portion such that the locking portion travels toward the disc surface and locks the knife in at least one direction.

16. A header for an agricultural vehicle, comprising:

a header frame;

a cutterbar mounted to the header frame, the cutterbar including

a cutting unit having:

a rotary driver;

a rotatable disc coupled to the rotary driver;

at least one knife mount coupled to a disc surface of the rotatable disc and including a locking portion biased toward the disc surface; and

a knife locked by the locking portion, the knife having a knife thickness, and

a guard assembly that includes a plurality of extensions, each of the plurality of extensions having a bottom portion and a top portion connected to the bottom portion defining a passage height,

wherein the passage height is about 1.5 to 2.0 times greater that the knife thickness.

17. The header of claim 16 , wherein the cutting unit further comprises a knife slot that includes:

a pair of knife stops mounted to the disc surface, and

a support extending between and connected to at least one of the pair of knife stops, the knife being held in the knife slot.

18. The header of claim 17 , wherein the guard assembly further comprises a curved base portion and the plurality of extensions extend from the base portion.

19. The header of claim 16 , wherein the guard assembly further comprises a curved base portion and the plurality of extensions extend from the base portion.

20. The header of claim 16 , wherein the locking portion further comprises a locking projection extending vertically and having an upper surface spaced from an upper surface of the knife.