Crop cutting knives for agricultural combine harvester

A cutting knife configured to be coupled to an agricultural combine harvester to cut crop plants from an agricultural field, the cutting knife comprising:

• a base configured to be coupled to a head unit of the agricultural combine harvester;
• and
• a blade including a blade central axis extending away from the base, the blade including a plurality of cutting teeth, each tooth of the plurality of teeth having a tip, the blade including an edge tangent to each tip on a first side of the blade, the edge obliquely oriented relative to the blade central axis, the plurality of cutting teeth including a first tooth, a second tooth consecutive with the first tooth, a third tooth consecutive with the second tooth, a fourth tooth consecutive with the third tooth, and a fifth tooth consecutive with the fourth tooth, the consecutive first, second, third, fourth, and fifth teeth positioned along the edge,
• wherein a first distance separates the tips of a first adjacent pair of the consecutive first, second, third, fourth, and fifth teeth,
• wherein a second distance different than the first distance separates the tips of a second adjacent pair of the consecutive first, second, third, fourth, and fifth teeth,
• wherein a third distance substantially the same as the first distance separates the tips of a third adjacent pair of the consecutive first, second, third, fourth, and fifth teeth, and
• wherein a fourth distance substantially the same as the second distance separates the tips of a fourth adjacent pair of the consecutive first, second, third, fourth, and fifth teeth.

A cutting knife configured to be coupled to an agricultural combine harvester to cut crop plants from an agricultural field, the cutting knife comprising:

• a base configured to be coupled to a head unit of the agricultural combine harvester;
• and
• a blade extending away from the base, the blade including
• an edge, and
• a plurality of cutting teeth formed from the edge, the plurality of cutting teeth including a first grouping at least having three consecutive teeth positioned along the edge having a first pitch, the plurality of cutting teeth also including a second grouping at least having three consecutive teeth positioned along the edge having a second pitch less than the first pitch;
• wherein the first grouping of the at least three consecutive teeth is positioned closer to an end of the blade opposite the base than the second grouping of the at least three consecutive teeth.

A crop cutting assembly for a head unit of an agricultural combine harvester, the crop cutting assembly configured to cut crop plants from an agricultural field, the crop cutting assembly comprising:

• a drive linkage configured to reciprocate along an axis;
• and
• a cutting knife including
• a base configured to be selectively coupled to the drive linkage;
• and
• a blade extending away from the base, the blade including an edge and a plurality of cutting teeth formed from the edge, the plurality of cutting teeth including consecutive first, second, third, fourth, and fifth teeth each having a tip,
• wherein a first pitch separates the tips of the first and second teeth, the first pitch separates the tips of the second and third teeth, a second pitch less than the first pitch separates the tips of the third and fourth teeth, and the first pitch separates the tips of the fourth and fifth teeth.