An impact material processing device

-9. (canceled)

-13. (canceled)

-17. (canceled)

-25. (canceled)

-29. (canceled)

-34. (canceled)

(canceled)

(canceled)

A drive system for at least one impact material processing device when mounted on a combine having a straw chopper and a power take off, wherein the impact material processing device is arranged to receive a chaff stream produced by the combine and the straw chopper is arranged to receive a straw produced by the combine, the drive system comprising:

• a jack shaft having a jack shaft pulley arrangement, a chopper pulley arrangement coupled to a driveshaft of the straw chopper, a device input pulley arranged to transfer drive to the at least one impact material processing device and a single common belt that engages the jack shaft pulley arrangement, the chopper pulley arrangement and the device pulley arrangement and wherein the single common belt is driven mechanically by and coupled to the combine power take off via the a jack shaft.

-44. (canceled)

An impact material processing device comprising:

• a central impact mechanism arranged to rotate about a rotation axis;
• at least one stator having one or more openings through which material impacted by the impact mechanism can pass;
• at least one stator extending circumferentially about the impact mechanism, a housing extending about the stator, an upper plate and a base plate, the housing extending between the base plate and the upper plate and wherein the at least one stator is located with the housing and can be moved between a first position upper and lower edges of the at least one stator is on the base plate and an upper edge extends to at least an inside surface of the upper plate, and a bypass position where the at least one stator is moved to a position where the lower edge of the at least one stator is lifted from the base plate to form a gap through which material entering the device can flow radially beyond the at least one stator.