Drive linkage for cleaning shoe

An agricultural harvesting machine comprising:

• a chassis;
• a header for cutting and gathering agricultural material;
• a rotor for breaking the agricultural material;
• and
• a cleaning shoe including,
• a chaffer supported for movement relative to the chassis,
• a sieve positioned below at least a portion of the chaffer, the sieve supported for movement relative to the chassis,
• a first link including a first end and a second end coupled to the chaffer,
• a second link including a first end and a second end coupled to the sieve,
• a first cam rotating about a first axis and coupled to the first end of the first link, the rotation of the first cam driving the first link to reciprocate the chaffer, and
• a second cam coupled to the first end of the second link, the rotation of the second cam driving the second link to reciprocate the sieve, the second cam angularly offset relative to the first cam by a phase angle less than 180 degrees about the first axis.

A cleaning shoe for an agricultural machine, the agricultural machine including a chassis and a header for harvesting agricultural material, the cleaning shoe comprising:

• a chaffer configured to be supported for movement relative to the chassis;
• a sieve positioned below at least a portion of the chaffer, the sieve configured to be supported for movement relative to the chassis;
• a first link including a first end and a second end coupled to the chaffer;
• a second link including a first end and a second end coupled to the sieve;
• and
• a drive shaft rotating about a shaft axis, the drive shaft coupled to the first end of the first link and the first end of the second link, the rotation of the drive shaft driving the first link to move eccentrically about the shaft axis and reciprocate the chaffer, the rotation of the drive shaft driving the second link to move eccentrically about the shaft axis and reciprocate the sieve, the eccentric movement of the second link being out of phase with the eccentric movement of the first link by a phase angle less than 180 degrees about the shaft axis.