fig1 shows a self - propelled combine 10 with a supporting frame 12 that is supported on the ground and moved by means of driven front wheels and steerable rear wheels 14 . the wheels 14 are set in rotation by a not - shown driving means in order to move the combine 10 over a field to be harvested . a harvesting assembly in the form of a cutting mechanism 16 is connected to the front end region of the combine 10 in order to harvest the crop standing in a field and to upwardly and rearwardly feed the crop to threshing and separating means via a feeder house 18 . the threshing and separating means comprise a transversely arranged threshing cylinder 20 and a concave 21 associated therewith . the harvested crop is initially fed to the threshing cylinder and concave . however , it would also be conceivable to omit the transversely arranged threshing assembly 20 and 21 and utilize a rotary threshing and separating assembly that is axially arranged . in this respect , it is possible to use only one axial separator or two ( or more ) axial separators arranged adjacent to one another . the separating assembly could also consist of straw walkers or separating drums that are arranged downstream of a threshing assembly 20 and 21 . in the illustrated combine 10 , a stripping roll 23 and a fed beater 22 cooperate with a feed housing to feed the threshed crop from the threshing assembly 20 and 21 to an axial separator 24 . the axial separator 24 is driven on its rear side by a gear 80 . in the following description , all directions such as front , rear , above and underneath refer to the forward driving direction v of the combine 10 . the grain and the chaff separated during the threshing process fall onto at least one screw conveyor 30 that feeds the grain and the chaff to a preparation bottom plate 33 . however , the grain and chaff emerging from the axial separator 24 fall onto a vibrating bottom plate 32 that conveys the grain and the chaff onto the preparation plate 33 . the preparation plate 33 conveys the grain and the chaff to a cleaning assembly 34 having sieves arranged therein , wherein a blower 36 is assigned to the cleaning assembly in order to promote the separation of the chaff from the grain . the clean grain is fed to a not - shown elevator by means of a clean grain auger 38 , and the elevator transports the grain into a grain tank 40 . a tailings auger 42 returns non - threshed crop parts to the threshing process by means of another not - shown elevator . the chaff is ejected on the rear side of the sieves onto a vibrating bottom plate 84 that carries out an oscillating movement . the cleaned grain can be unloaded from the grain tank 40 by means of an unloading system with transverse screw augers 44 and an unloading auger 46 . the aforementioned systems are driven by an internal combustion engine 48 that is controlled by an operator from a driver cab 50 . the different threshing , conveying , cleaning and separating assemblies are situated within the supporting frame 12 . a first crop residue stream that essentially comprises threshed crop residues ( straw ) is downwardly ejected from the axial separator 24 that serves as the separating assembly ( or one of the other alternative separating assemblies mentioned above ), through an outlet 64 on the underside of the rear end of the rearwardly closed axial separator 24 . the crop residues fall into a vertical ejection shaft , the front of which is defined by a front wall 62 . an ejection drum 66 with drivers 67 distributed over its circumference is arranged beneath the outlet 64 . the rear of the ejection drum 66 is enclosed by a rear wall 86 . the ejection drum 66 is set in rotation about its longitudinal axis that extends transverse to the driving direction by an assigned drive , namely in the counterclockwise direction in fig1 . a straw guide element 68 that can be pivoted in its entirety about the axis of rotation of the ejection drum 66 adjoins the front wall 62 at approximately half its height , namely underneath the axis of rotation of the ejection drum 66 . the straw guide element 68 can be pivoted about this axis between the swath laying position illustrated in fig1 , 3 a and 4 a and the chopping position illustrated in fig5 a . a generally known straw chopper 70 is arranged in a housing 72 beneath and slightly to the rear of the ejection drum 66 . this straw chopper can be set in rotation ( in the counterclockwise direction in the figures ) about a horizontal axis that extends transverse to the driving direction by means of a suitable drive and said chopper comprises a cylindrical body with chopping knives suspended thereon in a pendulum fashion . these chopping knives cooperate with stationary knives arranged in the housing 72 in order to chop and distribute the crop residues on the field over approximately the cutting width of the cutting mechanism 16 by means of a straw distributing shroud 74 that is equipped with straw guide plates 82 . one part of the housing 72 extends above the straw chopper 70 in the form of a circular arc , namely from the front end of the straw distributing shroud 74 to a point that approximately lies above the axis of rotation of the straw chopper 70 as shown in fig1 , 3 a , 4 a and 5 a . the straw guide element 68 is curved in a concave fashion ( and in the shape of a circular arc ) and concentrically surrounds the ejection drum 66 for an angle of approximately 45 degrees . the straw guide element is coupled to the supporting frame 12 of the combine 10 in a pivoted fashion on its outer ends in the transverse direction . in the swath laying position shown and fig1 , 3 a and 4 a , the straw guide element 68 extends from the front wall 62 to a point that approximately lies above the axis of rotation of the straw chopper 70 . in this position , the straw guide element 68 conveys the threshed crop residues from the ejection drum 66 transversely rearward and downward beneath the ejection shroud 76 . the underside of the ejection shroud 76 is , just like the straw distributing shroud 74 , provided with straw guide plates 78 in order to define the width of the swath of crop residues being laid down . the vibrating bottom plate 84 extends rearward and upward from the lower rear end of the cleaning assembly 34 to a chopper inlet 88 that is in the form of an opening between the lower end of the front wall 62 of the ejection shaft and the upper end of the housing 72 of the straw chopper 70 , wherein said opening extends over the width of the ejection shaft and the straw chopper 70 . according to fig2 , the vibrating bottom plate 84 is connected to a suitable drive , such as a cam , so that it carries out an oscillating back and forward movement along its longitudinal direction similar to the vibrating preparation plate 32 . this is indicated by the arrows 92 . the vibrating bottom plate 84 is provided with sawtooth - shaped steps 90 as shown in fig2 or another suitable surface structure . this causes the chaff and other chopped straw fractions which are delivered onto the vibrating bottom plate 84 from the rear end of the cleaning assembly 34 under the influence of the blower 36 and through gravitational force in the form of a second crop residue stream to travel rearward and upward on the vibrating bottom plate 84 until they are conveyed through the opening 88 and into the straw chopper 70 . the straw chopper 70 also operates in the position of the guide plate 68 illustrated in fig1 , 3 a and 4 a . in this case , the straw chopper conveys the chaff and the chopped straw fractions , wherein the conveying effect suffices for conveying the chaff and the chopped straw fractions along the straw guide plates 82 and for ejecting them behind the combine 10 onto the field . the straw guide plates 82 of the straw distributing shroud 74 are coupled to the straw distributing shroud 74 such that they can be pivoted about axles 94 that extend transverse to their longitudinal axis and the crop conveying direction . the pivoting axles are approximately situated on the rear ends of the straw guide plates in the embodiment shown . the straw guide plates 82 can be adjusted manually or in a remote - controlled fashion from the driver cab 50 , namely by means of suitable actuators in the form of electric or hydraulic motors that , in particular , are controlled by suitable sensors that automatically ensure the desired width of distribution . the straw guide plates 82 can be moved in this fashion between the broad laying position shown in fig3 b and the swath laying position shown in fig4 b . in the broad laying position ( fig3 b ), the rear ends of the straw guide plates 82 point outward and the two central straw guide plates 82 contact one another on their front ends such that the chaff is prevented from being conveyed into the swath and the chaff is distributed on both sides and outside the swath of straw laid down in the swath laying mode , namely over approximately the width of the cutting mechanism 16 . the arrows in fig3 b indicate that the straw can be harvested without a chaff fraction . in the swath laying position ( fig4 ), the straw guide plates 82 extend in the forward driving direction v of the combine 10 . the chaff is blown into the straw swath in the form of a swath , the width of which approximately corresponds to the width of the straw swath , such that a swath consisting of a straw / chaff mixture is laid down as indicated in fig4 a and 4 b . the chaff could also be laid down beneath the straw swath by manually or mechanically pivoting the straw distributing shroud 74 downward about the horizontal axle that extends transverse to the forward driving direction v at its coupling point on the housing 72 of the straw chopper 70 . in the swath laying mode , it would also be conceivable to move the straw guide plates 82 into a position , in which the chaff is distributed over the field . in this case , part of the chaff also is laid down underneath the straw swath analogous to the position illustrated in fig5 b . in the chopping position , the straw guide element 68 is pivoted rearward ( in the clockwise direction referred to fig1 ) about the axis of rotation of the ejector drum 66 as shown in fig5 a . this causes an opening to be formed between the front wall 62 and the front edge of the straw guide element 68 , wherein the crop residues are introduced into the straw chopper 70 through this opening . in this position , the straw guide element 68 extends the rear wall 86 downward and forward . if the straw guide element is in the swath laying position , the front wall 62 , in its region below the line at which the straw guide element 68 adjoins , could also be provided with guide skids 84 in order to introduce the crop residues into the straw chopper 70 in the most uniform fashion possible . the straw and the chaff are chopped in the straw chopper 70 and ejected transversely rearward and downward such that they are distributed on the field over the operating width of the cutting mechanism 16 as indicated by the arrows in fig5 b . the straw guide element 68 can be moved between the swath laying position and the chopping position by means of a manually actuated mechanism or suitable motors that are preferably remote - controlled from the driver cabin 50 . it would be conceivable to provide buttons or menus that make it possible to simultaneously adjust the straw guide element 68 and the straw guide plates 82 such that any of the operating positions of the straw guide element 68 and the straw guide plates 82 which are illustrated in fig3 , 4 and 5 can be selected by pressing only one button or selecting only one operating mode on a screen . having described the illustrated embodiment , it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims .
a combine comprising a separating assembly providing a first crop residue stream , the first crop residue stream is directed to a straw guide element having a chopping mode position for directing the first crop residue stream to a straw chopper for chopping the first crop residue stream and a swath forming mode position for conveying the first crop residue stream around the straw chopper laying the first crop residue stream in a swath . the combine also comprises a cleaning assembly providing a second crop residue stream that engages a conveying assembly which mechanically conveys the second crop residue stream from the cleaning assembly to the straw chopper .