fig1 shows part of a schematic side view of an agricultural harvesting machine 2 designed as a self - propelled combine harvester 1 . combine harvester 1 includes a feed rake 6 on the front side , a not - shown front attachment being assigned to feed rake 6 to cut and pick up the crops grown in the field , the front attachment conveying the crop material to feed rake 6 . feed rake 6 conveys crop material 5 to threshing parts and working units 8 , 13 , 17 located in machine housing 7 . crop material 5 exiting feed rake 6 is caught by preliminary cylinder 8 rotating in the counterclockwise direction , preliminary cylinder 8 being bordered on its underside by a threshing and separating grate 9 . crop material 5 is drawn by preliminary cylinder 8 through threshing gap 10 located between preliminary cylinder 8 and threshing and separating grate 9 , crop material 5 being guided in its direction by threshing and separating grate 9 . preliminary cylinder 8 processes crop material 5 intensively , so that the kernels are separated from the fruit of crop material 5 . a crop - material flow 12 composed mainly of kernels is separated by threshing and separating grate 9 and conveyed downstream to working unit 30 , which are not described in greater detail . a further cylinder 13 , which also rotates in the counterclockwise direction , is located downstream of preliminary cylinder 8 , in its rear region . the crop material exiting the rear region of threshing gap 10 is captured by cylinder 13 and conveyed by cylinder 13 through a threshing gap 15 bordered by cylinder 13 and a threshing and separating grate 14 located below cylinder 13 , crop material 5 being conveyed along threshing and separating grate 14 . when crop material 5 is conveyed through threshing gap 15 , the crop material 5 is conveyed through threshing gap 15 , the crop material is processed intensively , so that further kernels are separated from the fruit of crop material 5 . a second crop - material flow 16 , which is also composed mainly of kernels , is separated on threshing and separating grate 14 and is also conveyed to further working units 30 , which are not described in greater detail . it is within the scope of the present invention for combine harvester 1 to have any number of cylinders positioned one behind the other , it being possible for the cylinders to have any type of configuration . in the rear region , an impeller 17 that rotates in the counterclockwise direction is assigned to cylinder 13 , impeller 17 catching crop material 5 exiting threshing gap 15 and conveying it to a separating unit 18 , e . g ., a tray - type shaker 19 . the present is expressly not limited to these types of combine harvesters . instead , it also relates , e . g ., to combine harvesters having at least one rotor as the separating unit . a stripping unit 20 is located above impeller 17 , which limits the quantity of crop material conveyed by impeller 17 by stripping off any crop material that extends past the circumference of impeller 17 . stripping unit 20 , which is mounted on machine housing 7 in a height - adjustable manner , extends continually from machine housing 7 nearly to the circumference of impeller 17 , a gap 21 remaining between the circumference of impeller 17 and stripping unit 20 , to prevent collisions . it is feasible that stripping unit 20 is supported on machine housing 7 such that it can move in the manner of a pendulum , so it can move out of the way , if necessary , when crop material 5 is not stripped away by stripping unit 20 . stripping unit 20 , which is mounted such that it can move in the manner of a pendulum , can be acted upon with a return force , so that stripping unit 20 is not continually moved back and forth by small quantities of overshot crop material conveyed by impeller 17 , but rater only by large quantities of crop material that extend past a circumference of impeller 17 . a rotary chamber 24 according to the present invention and to be described in greater detail below is configured on stripping unit 20 at the circumference of impeller 17 , rotary chamber 24 redirecting the air current produced by rotating impeller 17 into the rear region of the combine harvester 1 . it is within the scope of the present invention that stripping units can also be located above cylinders 8 , 13 , it being possible for rotary chambers according to the present invention to also be configured at the circumference of associated cylinders 8 , 13 . rotary chamber 24 according to the present invention is formed by a housing 25 that matches a portion of the circumferential surface of impeller 17 , housing 25 being formed by a bent profile 27 that has an opening 28 in the circumferential direction of impeller 17 . opening 28 of housing 25 faces away from the direction of rotation of impeller 17 . the air current produced by impeller 17 flows into housing 25 and produces a vortex in the region of rotary chamber 2 . the subsequent air current conveyed by impeller 17 is redirected past the vortex into the rear region of machine housing 7 . rotary chamber 24 is therefore responsible for redirection the air current conveyed by impeller 17 into the rear region of combine harvester 1 , and the dustlike crop material is conveyed with the air current into the rear part of machine housing 7 . fig2 shows an impeller 17 with stripping unit 20 located above it , in a rear view . stripping unit 20 extends across with width of impeller 17 , and housing 25 is bounded at the ends of profile 27 by side panels 29 of machine housing 7 . it is within the scope of ability of one skilled in the art to modify the exemplary embodiments described in a manner not presented , or to use them in other machines to achieve the effects described , without leaving the framework of the invention . it will be understood that each of the elements described above , or two or more together , may also find a useful application in other types of constructions differing from the types described above . while the invention has been illustrated and described as embodied in a combine harvester , it is not intended to be limited to the details shown , since various modifications and structural changes may be made without departing in any way from the spirit of the present invention . without further analysis , the foregoing will so fully reveal the gist of the present invention that others can , by applying current knowledge , readily adapt it for various applications without omitting features that , from the standpoint of prior art , fairly constitute essential characteristics of the generic or specific aspects of this invention .
a self - propelled combine harvester has a threshing mechanism composed of at least one aggregate selected from the group consisting of a threshing part , a working unit , and both , at least one stripping unit which is assigned to the at least one aggregate , and at least one rotary chamber configured on the at least one stripping unit on a circumference of the at least one aggregate .