Weed seed destruction on a combine harvester including a moveable guide wall for the chaff and weed seeds from the sieve

A combine harvester comprising:

• a separation system having separating components engaging a harvested crop and separating the harvested crop into grain, a first material comprising straw and a second material comprising chaff and weed seeds;
• the separation system including at least one sieve which separates the grain which falls through the sieve from the second material comprising the chaff and weed seeds which passes over the sieve to a rear end of the sieve;
• a chopping rotor having a chopper inlet receiving the first material comprising straw and acting to chop the first material and a spreading device spreading the first material from the straw chopping rotor at least to sides of the combine harvester;
• and at least one weed seed destructor section comprising an inlet arrangement-receiving the second material and at least one weed seed destructor component receiving the second material and acting to cause devitalization of the weed seeds in the second material;
• a guide wall having a guide wall surface over which the second material flows from a leading edge of the guide wall to a rear edge at or adjacent the inlet arrangement;
• a pivot mounting supporting the guide wall for pivotal movement of the guide wall about a pivot axis transverse to the combine harvester;
• the guide wall being pivotal about said pivot axis between first and second positions defining first and second operating modes, where:
• in the first position of the guide wall both the first material and said second material are directed to the chopper inlet, and
• in the second position of the guide wall the first material is directed to the chopper inlet and the second material is directed to said inlet arrangement of the weed seed destructor section;
• wherein the pivot mounting is located at or adjacent the leading edge of the guide wall and the guide wall extends rearwardly from the pivot mounting and the guide wall pivots upwardly and downwardly to move the rear edge of the guide wall upwardly and downwardly between said first and second positions.