[ 0026 ] fig1 shows an agricultural combine 10 with a chassis 12 which is supported and propelled by ground engaging wheels 14 . although the combine 10 is illustrated as being supported and propelled on ground engaging wheels 14 it can also be supported and propelled by full tracks or half tracks . a harvesting assembly 16 is used to take up crop and to conduct it to a feederhouse 18 . the crop is conducted by the feederhouse 18 to a beater 20 . the beater 20 guides the crop upwardly through an intake transition region 22 to a rotary threshing and separating assembly 24 . although the invention is described in conjunction with a rotary combine , it can also be applied to other types of combines ( for example conventional combines having a transverse threshing cylinder and straw walkers or combines having a transverse threshing cylinder and rotary separator rotors ) or other agricultural machines . in addition , although the illustrated harvesting assembly is a harvesting platform the present invention can be used on other harvesting assemblies including flex cutterbar harvesting platforms , row crop headers , corn headers , pickup platforms and other harvesting assemblies . the rotary threshing and separating assembly 24 comprises a rotor housing 26 and a rotor 28 arranged in the rotor housing 26 . the harvested crop enters the rotor housing 26 through the intake transition region 22 . the rotary threshing and separating assembly 24 threshes and separates the harvested crop . grain and chaff fall through grates at the bottom of the rotor housing onto a cleaning assembly 34 . the cleaning assembly 34 removes the chaff and conducts the clean grain to a grain elevator 36 which conducts upwardly to a distributing screw conveyor 38 . the distributing screw conveyor 38 deposits the clean grain in a grain tank 40 . the clean grain in the grain tank 40 can be unloaded through an unloading auger 42 into a trailer or truck . threshed straw separated from the grain is conducted out of the rotary threshing and separating assembly 24 through an outlet to a discharge beater 46 . the discharge beater 46 ejects the straw out the rear of the combine 10 . the operation of the combine 10 is controlled from an operator &# 39 ; s cab 48 . a geographic position sensor in the form of a receiver 50 for the reception of gps signals ( global positioning system ) is attached above the operator &# 39 ; s cab 48 . although it is at least in principle not necessary , when the accuracy of the receiver 50 is sufficient , a speed sensor measuring the speed of the wheels 14 can be provided . mounted on one side of the clean grain elevator 36 is a capacitor moisture sensor 52 for measuring the moisture content of the clean grain . such a sensor is disclosed in de 199 34 881 a . a mass flow sensor 54 is located at the outlet of the clean grain elevator 36 . the mass flow sensor 54 comprises an impeller plate mounted for rotation about a horizontal axis . its deflection is dependent upon the mass flow rate of the clean grain . the deflection of the impeller plate is measured and thus data on the mass flow rate of the harvested grain is provided . such a sensor is described in ep 0 853 234 a and the documents recited therein . a processor 56 located in the operator &# 39 ; s cab 48 ( or somewhere else on the combine 10 ) is connected to the gps receiver 50 , the moisture sensor 52 , the mass flow sensor 54 , and the speed sensor , when present . the processor 56 is provided with an internal clock or receives external time signals , for example from the receiver 50 . the processor 56 records the amount of harvested grain ( measured by means of the mass flow sensor 54 ) and its moisture content ( measured by means of the moisture sensor 52 ) dependent on the geographical position of the combine 10 ( measured by means of the gps receiver 50 ). the processor 56 logs the data and produces a field summary . thus , it is possible to create a yield map with the logged data . in order to reduce errors when generating the yield map , the harvesting assembly 16 is provided with a swath width sensing assembly , shown in fig2 . the swath width sensing assembly submits data to the processor 56 , preferably by means of a bus , cables , optical fibers or electromagnetic waves . thus , the actual width of the harvested swath is measured and considered when the yield map is generated . the processor 56 is informed when the swath of harvested crop is narrower than the active width of the header 16 , which might happen at an end of a field , or when the combine 10 passes certain parts of a field a second time . the processor 56 is capable of calculating a correct yield , since the latter depends on the amount of harvested grain and on the area on which it was harvested . this area depends on the actual swath width measured by the swath width sensing assembly . the harvesting assembly 16 comprises cutter bar 58 for cutting the crop and an auger 60 for feeding the cut crop to the center of harvesting assembly 16 , where the harvested crop is fed into the feederhouse 18 . the cutterbar 58 and the auger 60 are positioned between left and right side sheets . crop dividers 62 are located at the front of the side sheets 60 . the dividers 62 are driven into the crop splitting the crop sideways in front of the harvesting assembly 16 before it is cut by the cutter bar 58 . the dividers 62 define the active width of the harvesting assembly . although not shown , a conventional reel is usually located above the cutter bar 58 . the front of the harvesting assembly 16 behind the cutter bar 58 is provided with a number of crop presence sensors 64 for detecting the presence of crop . these sensors 64 are distributed along the width of the harvesting assembly 16 . the crop presence sensors 64 submit data containing information whether crop is in their detection range ( or not ) to the processor 56 . in the embodiment shown in fig2 six crop presence sensors 64 are evenly distributed over the active width of the harvesting assembly 16 . a swath of crop to be harvested is indicated with reference numeral 66 . since in fig2 the two uppermost crop presence sensors 64 ( the most left sensors in the forward moving direction of the harvesting assembly 16 ) are not within the swath width , they will provide the processor 56 with a signal indicating the lack of crop . the three crop presence sensors 64 shown in fig2 below the two uppermost crop presence sensors 64 are within the swath width . thus , they submit a signal to the processor 56 indicating that crop is presently harvested at their location . finally , the lowermost crop presence sensor 64 shown at the bottom of fig2 ( the most right sensor in the forward moving direction of the header 16 ) is outside the swath width , as well , and submits a corresponding signal to the processor 56 . the crop presence sensors 64 distributed over the active width of the header 16 thus provide information on the actual width of the harvested crop swath to the processor 56 . according to the information provided by the crop presence sensors 64 , the processor 56 can determine the actual width of the swath 66 . the processor 56 is also operable to detect whether harvesting is performed and thus whether crop is received at all ( when at least one crop presence sensor 64 gives an information that crop is present ) or not ( when no crop presence sensor 64 submits data indicating that crop is present ). thus , a sensor for detecting if the harvesting assembly is raised or lowered is superfluous , and disadvantages of such sensors , as inaccuracy , are avoided . in fig3 a vertical cross sectional view of the harvesting assembly 16 is given . a crop presence sensor 64 is located at the rear end of the table 74 of the harvesting assembly 16 . sensor 64 is embedded into the surface of the table 74 . an alternative position of a crop presence sensor is indicated with 64 ′. crop presence sensor 64 ′ is embedded into a stone ridge 76 at the forward end of the table 74 , behind the cutterbar 58 . preferably , the crop presence sensors 64 are capacitive sensors . such sensors are available from carlo gavazzi industri a / s , over hadstenvej 38 , 8370 hadsten , denmark , order number ec 5525ppap . an embodiment of a capacitive crop presence sensor 64 is shown in more detail in fig4 . the crop presence sensor 64 is embedded into the upper surface of the table of the harvesting assembly 16 . the crop presence sensor 64 comprises a conductive foil 70 or plate mounted below an insulating ( but not necessarily transparent ) window 68 lying in the plane of the upper surface of the table 74 of the harvesting assembly 16 . the foil 70 is electrically connected to a signal processor 72 . when crop is present above the window 68 , the electric capacitance of the foil 70 measured against the header alters ( increases ). the signal processor 72 measures the electric capacitance of the foil 70 . for example , the foil 70 is part of an electric resonance circuit , the resonance frequency of which is measured . any other measurement of the capacitance is possible , as well . the signal processor 72 thus provides information regarding the presence of crop in the crop presence sensor &# 39 ; s 64 vicinity to the processor 56 . in order to avoid crop resting on the window 68 from triggering the crop presence sensor 64 , producing an error of the yield map , the crop presence sensor 64 is positioned on the table 74 of the harvesting assembly 16 . hence crop remaining on the window 68 is normally wiped away by harvested crop passing across the table 74 . alternatively or additionally , the output of the signal processor 72 is electrically processed removing the effect of any stationary material actuating the crop presence sensors 64 . thus , a time derivation of a value representing the electrical capacitance of foil 70 can be obtained and further processed . in fig5 another embodiment of a capacitive crop presence sensor 64 is given . it is located above the surface of the table 74 of the harvesting assembly . a ramp 78 in forward direction before and behind the crop presence sensor 64 keeps the surface of the crop presence sensor free of stationary material . [ 0038 ] fig6 shows a third embodiment of a crop presence sensor 64 , located below the stone ridge 76 , and fig7 represents a fourth embodiment of a crop presence sensor 64 , integrated into the stone ridge 76 , like the crop presence sensor 64 ′ in fig3 . the elements of the crop presence sensors 64 of fig5 to 7 are the same as those of the sensor shown in fig4 . for either position 64 or 64 ′ shown in fig3 it is possible to make use of separate crop presence sensors 64 as indicated in fig2 . in another embodiment , shown in fig8 two arrays of crop presence sensors 64 are provided . a first array of crop presence sensors 64 is placed at the left - hand edge of the table 74 . a second ( optional ) array of crop presence sensors 64 is placed against the right - hand end of the table . this arrangement of sensors operates like the one disclosed in fig2 except when the swath width does not cover the sensor array or arrays the processor 56 records the width as zero . both arrays of crop presence sensors 64 preferably cover a width of 0 . 2 to 1 . 0 m . software is used to insert the missing data on the yield map by interpreting between adjacent runs where the table was nearly full . thus , the yield is known more accurately than with the embodiment of fig2 although a similar number of crop sensors 64 is used . having described the preferred 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 crop width measuring assembly is mounted to a harvesting assembly of an agricultural machine for measuring the actual width of the crop swath received by the harvesting assembly . the crop width measuring assembly comprises a plurality of crop presence sensors distributed along the width of the harvesting assembly . the crop width measuring assembly is in communication with a processor for monitoring different crop parameters in relation to their geographic location in a field .