Harvested crop processing unit with selectable guide rails of differing inclinations

An agricultural combine, comprising:

• a supporting structure;
• wheels for engagement with the ground that are mounted on the structure;
• a slope conveyor disposed at the front of the supporting structure;
• a guide drum on the supporting structure that is disposed to receive harvested crop from the slope conveyor;
• and
• a harvested crop processing unit disposed on the supporting structure to receive harvested crop from the guide drum, the harvested crop processing unit further comprising,
• a rotor,
• a rotor housing enclosing the rotor, the rotor housing further comprising
• a cover element, said cover element having slots therein;
• a first group of helical guide rails that can be moved relative to the cover element between an operating position in which they are located underneath the cover element in engagement with the harvested crop and a non-operating position in which they are located above the cover element;
• a second group of helical guide rails that can be moved in alternation with the first group of helical guide rails relative to the cover element between an operating position in which they are located underneath the cover element in engagement with the harvested crop and a non-operating position in which they are located above the cover element, wherein the second group of helical guide rails are provided with an inclination that differs from the inclination of the first group of helical guide rails, the helical guide rails being configured to be moved through the slots in the cover element between the operating position and the non-operating position;
• and
• a guide rail operating arrangement being operatively coupled to said first and second groups of helical guide rails, with said guide rail operating arrangement being operable for placing one of said first and second groups of helical guide rails in its non-operating position while simultaneously placing another of said first and second groups of helical guide rails in its operating position.