Abstract:
A control system for a header for an agricultural harvesting machine such as a combine, providing features including an automatic reel position control operable to provide at least one selectable predetermined cutter bar and reel position combination, and which can also automatically control height and/or fore and aft positions of the reel responsive to cutter bar movements, as required, for purposes such as for maintaining and/or optimizing the reel/cutter bar relationship for a particular crop and/or condition, and for avoiding interference between the tines or fingers of the reel and the sickle of the cutter bar, and possible damage to the tines and/or sickles, and slippage of the reel and/or sickle drive, that can result.

Description:
TECHNICAL FIELD 
       [0001]    This invention relates generally a control system for a header for an agricultural harvesting machine such as a combine, and a method of operation of the same, and, more particularly, to a control system and method providing features including an automatic reel position control operable to provide at least one selectable cutter bar and reel position combination, and which can also automatically control height and/or fore and aft positions of the reel responsive to cutter bar movements. 
       BACKGROUND ART 
       [0002]    On a grain type header, a cutter bar typically extends across a lower front end of the header and includes a sidewardly reciprocating sickle for cutting crops. A gathering reel rotatable about a sidewardly extending axis is typically disposed above and forwardly of the cutter bar, and the type of reel of most concern here is commonly referred to as a pick up type reel will include generally radially outwardly extending tines or fingers which essentially function to rake crops rearwardly to the cutter bar, and also to convey the cut crops rearwardly over the cutter bar to a pan or cross conveyor of the header. In regard to this latter function, it is typically desired for the cut crops to flow smoothly and evenly, without collecting on the cutter bar and/or clumping, onto the pan of the header and to the cross conveyor, which can be an auger or belt, and the tines are often desirably positioned to sweep over the cutter bar without contacting it, to prevent and remove clumps. 
         [0003]    The height of the cutter bar, and the position of the reel relative to the cutter bar, both height-wise and fore and aft, are typically variable. For example, for legumes such as soybeans, a lower cutter bar is typically desired so as to cut close to the ground, because some of the bean bearing pods are located there, and it is desirable to harvest as much of the crop as is practical. For other crops, particularly grasses such as wheat, oats, and barley, the cutter bar (and the header) is typically positioned higher, for instance, at a height typically several inches above the ground, because the grain bearing heads are at the top of the plant. And, if the straw is not to be baled, it is typically desirable to cut at an even higher height, to limit the amount of straw which is cut and inducted into the harvesting machine. 
         [0004]    For taller stands of legumes and other crops to be cut closer to the ground, the reel will typically be positioned at a higher location relative to the cutter bar. For lower stands, and for other conditions, such as downed crops, the reel will typically be lower. Also for downed crops, the reel may desirably be positioned more forwardly, so as to increase the raking or picking up action thereof. 
         [0005]    Observed problems that can occur include that if the tines of the reel are too close to the cutter bar, the sickle can cut the tines if of a soft material such as plastic, and can damage the knife edges of the sickle and cause slippage of the reel drive and/or the sickle drive if the tines are of a harder material such as metal. Typically, at the higher cutting heights, the cutter bar is fixed to the header so as to be unable to flex or float. Therefore, when adjusting the reel position it is only necessary to position the reel as desired, while ensuring that the tines of the reel will not be too close to the cutter bar, which is easily done particularly if the reel is to be positioned relatively high above the cutter bar and not moved. In contrast, if the reel is positioned close above the cutter bar and adjustments are to be made, and when cutting crops such as soybeans close to the ground, caution and care must be used to avoid the above problems. In the latter instance, the cutter bar is often supported in a flex or floating mode wherein it is allowed to move vertically relative to the header within a limited range of travel, and, if the tines are within the range of travel, it is possible for the cutter bar to rise up so as to engage and cut or damage the tines, or cause the other problems set forth above. This can occur unexpectedly. 
         [0006]    Contributing to the possibility of the above problems, to increase productivity, the trend has been toward the use of wider or longer headers such that more crops are harvested during each pass of a harvesting machine over a field. With the lengthening of the headers, for instance, to lengths of 40 feet and greater, when in the float mode, the possibility of the raising all or part of the cutter bar as a result of contacting the ground is increased, due for instance, to unevenness of the ground. Also, because of the greater header width, it can be harder for a combine operator to detect field conditions that may cause the header to raise. 
         [0007]    To help avoid or limit the above problems, it is well known for a header to include an automatic header height control system which is used when the header is lowered to a lower cutting height for beans and the like, with the cutter bar in the flex or float mode. Generally, in operation, such control will use information relating to sensed contact with the ground to determine differences in level or slope of the ground, and irregularities of the ground surface, and automatically raise and lower the header for maintaining the cutter bar in desired relation to the ground, and for maintaining a desired down pressure on the cutter bar. For this, typical systems utilize a side-by-side array of skid shoes or plates in connection with the floating cutter bar, which skid shoes extend just below the cutter bar for sensing or contacting the ground, and when one or more of the skid shoes contact the ground sufficiently to move the cutter bar upwardly, the cutter bar will at the same time provide inputs to the header height control system through a sensor, to enable the system to determine whether to raise or lower the header. 
         [0008]    However, a problem that can occur in the operation of a header control system, is that the system may not respond to changes in ground conditions rapidly enough to avoid the cutter bar raising and causing the above problems such as contacting and damaging the reel tines. This problem can occur as a result of conditions such as slow responsiveness of the system, or settings such as a selected down pressure. For instance, this can occur as the header encounters an abrupt increase in ground height such as when emerging from a swail, ditch or depression in a field. 
         [0009]    As another known variant that can increase the possibility of the occurrence of the above problems, some headers include cutter bars and/or reels that are movable in the fore and aft directions, in addition to upwardly and downwardly, which provides increased adjustability. For instance, it may be desirable under some conditions to adjust the position the reel more forwardly of the cutter bar, and under other conditions, to have a more rearwardly located reel. As examples, for harvesting downed crops, a more forward and lower reel location may be most advantageous, and for taller crop stands, a higher and more rearward location may be preferred. And, in the former instance, it may be desirable adjust the fore and aft position of the cutter bar and/or the reel during operation, as well as the vertical position of the reel, to optimize crop pick up, such that there can be a danger of the tines accidentally entering the sickle, and/or the cutter bar raising up sufficiently to contact the tines, if a wrong or inadvertent movement is made. 
         [0010]    Thus, a need has been identified for a capability for closely controlling the relative positions of the reel and the cutter bar, particularly relatively complex two dimensional movements, so as to avoid the above occurrences. Further, a combine may be used for harvesting several varieties of crops, or a field to be harvested may contain both standing and downed crops, and, as a result, it would be desirable to have the capability to provide different preset reel and/or cutter bar positions for the various crop types and/or regions, and to be able to select them quickly and easily. 
         [0011]    Numerous control devices are known which attempt to meet partially the above need, by providing an automatic capability for controlling reel height relative to a movable or floating cutter bar, having utility both in cooperation with a header height control system and in the absence of one. Reference in this regard: Bernhardt, U.S. Pat. No. 4,124,970 entitled Automatic Reel Height Control For A Harvester Header Having a Flexible Cutterbar, which uses spring operated switches for operating a fluid control system for raising and lowering the reel responsive to cutter bar movements; and Milliken, U.S. Pat. No. 4,204,383 entitled Automatic Height Control For Gathering Reel For Agricultural Combine which uses a mechanical follower mechanism for tracking cutter bar movements. However, neither of these controls disclose a capability for controlling fore and aft movements also, or integration with apparatus for doing so, nor do they provide easy and convenient variability for adapting to different or changing conditions and crop types. 
         [0012]    Reference also Buermann U.S. Pat. No. 5,752,372 entitled Self-Propelling Agricultural Machine With Two-Part Cutting Mechanism Trough; and Hurlburt et al., U.S. Pat. No. 4,800,711 entitled Header for Harvesting Machine, which provide apparatus enabling the reel to follow fore and aft movements of the cutter bar, the former of which utilizes a cam mechanism, and the latter of which an interlock mechanism, but neither provide a capability for easy adjustability, or disclose use in cooperation with, or the ability to readily integrate with a vertical following capability, such as those disclosed in the Bernhardt and Milliken patents. 
         [0013]    Accordingly, what is sought is a reel position control that provides one or more of the capabilities and overcomes one or more of the problems, set forth above. 
       SUMMARY OF THE INVENTION 
       [0014]    What is disclosed is a control system for a header for an agricultural harvesting machine such as a combine, and, more particularly, to a control system providing at least one of the features or capabilities, and overcoming at least one of the problems, set forth above. 
         [0015]    According to a preferred aspect of the invention, the control system includes at least one controller programmed and operable to provide at least one selectable predetermined cutter bar and reel position combination, and which can also automatically control height and/or fore and aft positions of the reel responsive to cutter bar movements, so as to effectively follow the cutter bar movements, for maintaining the selected positional relationship between the cutter bar and the reel. As an example, one selectable cutter bar and reel position combination can position the cutter bar forwardly within a fore and aft range of movement thereof, and position the reel at a relatively high location in relation to the cutter bar, for instance, so as to have good utility for harvesting taller stands of crops, and another position combination can position the cutter bar more rearwardly and the reel lower, so as to have good utility for harvesting shorter stands of crops or crops down on the ground. And, in both instances, the controller can be programmed such that if the cutter bar is moved, either as a result of an inputted command, or as a function of a float capability, the controller will automatically control the reel to follow the movement, whether a forward or rearward movement, an up or down movement, or a combination of both. As a result, optimized reel operation can be maintained, and possible damage to the tines of the reel and/or sickle of the cutter bar, and other problems, such as, but not limited to, slippage of the reel and/or sickle drive, can be limited or avoided. 
         [0016]    According to another preferred aspect of the invention, the control system includes at least one cutter bar position sensor configured for sensing positions of a cutter bar of the header and outputting signals representative thereof; at least one reel position actuator connected to a reel of the header and controllably operable for moving the reel relative to the header; and at least one header position actuator in connection with the header and controllably operable for moving the header upwardly and downwardly relative to the harvesting machine. The system includes at least one controller connected to the at least one cutter bar position sensor for receiving the signals therefrom, and to the at least one reel position actuator and the at least one header position actuator for outputting operating commands thereto, respectively, the controller being programmed so as to automatically output commands to the at least one reel position actuator for moving the reel so as to follow movements of the cutter bar when the signals outputted by the at least one cutter bar position sensor represent a movement of the cutter bar within a predetermined range, and the controller being programmed so as to automatically output commands to the at least one header position actuator for moving the header upwardly or downwardly, respectively, when the signals outputted by the at least one cutter bar position sensor represent a movement of the cutter bar upwardly or downwardly, respectively, beyond a predetermined range. 
         [0017]    As an advantage of the invention, for smaller up and down movements of the cutter bar, for instance, resulting from the cutter bar floating over normal irregularities of the ground, the control system can output reel position commands to move the reel, to maintain the desired relation to the cutter bar. Then, when the cutter bar movements are greater, such as can be expected for abrupt changes in ground contour, e.g., swails and the like the system will raise the header, such that the cutter bar will effectively be lowered relative to the reel, to thereby maintain the desired cutter bar/reel relationship. 
         [0018]    As another advantage of the invention, because the control system is capable of monitoring cutter movements and responsively moving the reel or header to maintain the desired cutter bar/reel relationship, necessity for complex linkages and/or interlock mechanisms connecting the cutter bar and reel, is eliminated, as is any manual adjustment of such apparatus for changing the cutter bar/real relationship. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]      FIG. 1  is a side view of an agricultural combine having a header in a raised position above the ground, showing a cutter bar of the header depending therefrom, and a reel of the header supported in a suitable position above the cutter bar; 
           [0020]      FIG. 1A  is a side view of the front of the combine of  FIG. 1 , showing the header in a lowered position, with the cutter bar resting on the ground surface; 
           [0021]      FIG. 2  is a front view of the combine of  FIGS. 1 and 1A , showing the header in the lowered position and illustrating flexure of the cutter bar for conforming to contours of the ground surface, and showing the reel in dotted lines above the cutter bar; 
           [0022]      FIG. 3  is an enlarged, simplified schematic side view of the combine header, illustrating representative positioning and relationships of tines of the reel of the header to the cutter bar; 
           [0023]      FIG. 4  is another enlarged, simplified schematic side view of the header, illustrating representative interference between tines of the reel and the cutter bar; 
           [0024]      FIG. 5  is a simplified fragmentary perspective view of the cutter bar of  FIG. 4 , illustrating a tine of the reel inserted between the edge of a sickle knife and a guard of the cutter bar; 
           [0025]      FIG. 6  is a simplified diagrammatic representation of one embodiment of an automatic control system of the invention associated with elements of the combine and header of  FIG. 1 ; 
           [0026]      FIG. 7  is a simplified schematic side view of the header, illustrating the cutter bar and reel in a selectable predetermined relationship typical of those used for harvesting shorter stands of crops; 
           [0027]      FIG. 8  is another simplified schematic side view of the header, illustrating the cutter bar and reel in a second selectable predetermined relationship typical of those used for harvesting taller stands of crops; and 
           [0028]      FIG. 9  is a simplified diagrammatic representation of another embodiment of an automatic control system of the invention associated with elements of the combine and header of  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]    Turning now to the drawings wherein a preferred embodiment of the invention is shown, in  FIG. 1 , a conventional, well known agricultural combine  20  is shown including a conventional header  22  supported on a feeder  24 , for cutting or severing crops such as, but not limited to, legumes such as soybeans and small grains such as wheat, and inducting the severed crops into feeder  24  for conveyance into combine  20  for threshing and cleaning, in the well known manner as combine  20  moves forwardly over a field, as denoted by arrow A. Header  22  includes a bottom or pan  26  which is supported in desired proximity to a ground surface  28  of a field during the harvesting operation, and an elongate, sidewardly extending cutter bar  30  supporting elongate, reciprocally movable sickle knives  32  disposed along a forward edge of pan  26  which sever the crop for induction into header  22 . Header  22  includes an elongate, sidewardly extending reel  34  disposed above pan  26  and rotatable in a direction for gathering the crops to be cut toward cutter bar  30 , and then for facilitating induction of the severed crops into header  22 . An elongate, rotatable auger  36  extends in close proximity to a top surface of pan  26  and has spiral flights therearound (not shown) which convey the severed crops to feeder  24  for induction into combine  20 . In  FIG. 1 , header  22  is shown at an elevated position above ground surface  28 , which is representative of a typical height for transport over roads, and also for severing crops at a desired height above ground surface  28 , the height shown being intended to be representative of those typically used for harvesting grasses such as wheat, oats and barley, with minimal straw generation. Such heights as illustrated in  FIG. 1  will typically be 5 inches or more above ground surface  28 . In this configuration, cutter bar  30  will typically be supported at a fixed height in relation to header  22 , but may optionally be movable forwardly and rearwardly within a predetermined range of movement relative thereto. Reel  34  will be movable upwardly, downwardly, and optionally forwardly and rearwardly, in relation to header  22  and cutter bar  30 , for achieving desired crop cutting and induction characteristics. 
         [0030]    Referring also to  FIGS. 1A and 2 , header  22  is shown in another position, lowered to ground surface  28 , for positioning cutter bar  30  just above ground level, which is a height typically utilized for cutting crops, such as soybeans and the like. Here, it should be noted that typically, when a header, such as header  22 , is operated at a height such as shown in  FIGS. 1A and 2 , cutter bar  30  is typically operated or supported in a floating mode, wherein it is allowed to move vertically upwardly and downwardly relative to header  22  and pan  26  in response to contact with irregularities on or of ground surface  28 , for purposes including to avoid cutter bar  30  and/or sickle knives  32  contacting or being driven into ground surface  28  and possibly being damaged thereby. Typically also, this upward movement is sensed to provide information to one or more systems of the combine, such as an automatic header height control, a feeder height and/or angle control, a header tilt control, and/or other control, which may result in some action by the control or controls, which in the instance of a header height control, can include automatically raising the header, as is well-known. Apparatus for sensing upward movements of a cutter bar are well-known in the art, for instance, as illustrated in Bernhardt U.S. Pat. No. 4,124,970, entitled Automatic Reel Height Control For a Harvester Header Having a Flexible Cutterbar, issued Nov. 14, 1978, the disclosure of which is incorporated herein by reference in its entirety. 
         [0031]    Referring also to  FIGS. 3 and 4 , a typical cutter bar height sensor apparatus  38  is illustrated in association with cutter bar  30 , and generally includes a linkage or sensor arm  40  which is contacted by support structure  42  of cutter bar  30  when moved upwardly and downwardly, for translating the movements to a suitable sensor  44 , which can be, for instance, a conventional potentiometer, or the like, as is well-known in the art. 
         [0032]    Reel  34  shown is conventionally constructed and operable, and includes a plurality of elongate tines  46  supported at spaced locations on bars  48  extending across the width of header  22 , so as to move in a raking action toward header  22 , and particularly in the bottom region, toward cutter bar  30 , as the reel  34  is rotated in a counterclockwise direction, as denoted by arrow B, around a central axis  50  thereof. As illustrated in  FIG. 3 , reel  34  can be positioned close to cutter bar  30 , such that at their lower extend of travel around axis  50 , tines  46  will pass close to and even just over the cutter bar, which is advantageous as it gathers crops toward cutter bar  30  for cutting, and also so as to rake the cut crops over and rearwardly past the cutter bar, so as not to collect thereon and possibly interfere with the cutting action. A lowered position such as this, with the reel positioned even more forwardly, is useful in a role to pick up the crops, which can be advantageous when the crops are downed, that is, where the crops, or some of them, are lying on or close to ground surface  28 . 
         [0033]    However, a problem that can occur, as noted under the Background Art heading above and as illustrated in  FIG. 4 , and also in  FIG. 5 , is that if reel  34  is lowered too far and/or if cutter bar  30  in the floating mode moves upwardly too far, such as could occur if brought into contact with a raised irregularity on ground surface  28  or when emerging from a swail or ditch (see arrow C in  FIG. 4 ), tines  46  can be brought into contact with sharp sickle knife edges  52  of cutter bar  30 . This can occur along the entire width of the header, or at one or more locations therealong, as illustrated in  FIG. 2 . If this occurs, one or more of the tines may enter a space or spaces between the sharp knife edges  52  of sickle knife  32  and knife guards  54 , and be cut by the reciprocating action of sickle knife  32  (arrow D). Obviously, if this were to occur, the tine could be cut or broken, and/or the sharp edge of the sickle knife dulled, to thereby decrease the cutting effectiveness of the header. The sickle drive can also be affected. This may occur, even if a header height control system is operating, for instance, if the header down pressure setting is high, or the upward movement of the cutter bar is abrupt or rapid. It can also be observed that if the reel is moved farther in the rearward direction and/or is lowered, or cutter bar  30  is moved forwardly, the risk of contact between the sickle knife and tines is increased. 
         [0034]    The known hardware devices referenced and discussed above under the Background Art heading, attempt to address the problem of contact between a cutter bar and reel, but only in relation to certain relative movements thereof, generally, in either the vertical direction, or the horizontal direction. None of the referenced devices are configured for preventing such contact when movement in more than one direction is involved. This is a disadvantage for the discussed reasons. As apparent from this disadvantage, it would be desirable to have a capability for quickly and easily positioning the reel in close proximity with the cutter bar, without incurring risk of contact, both as the reel is initially positioned, and as it is subsequently moved or adjusted, and as the cutter bar is initially positioned, subsequently repositioned or adjusted, and further as it moves upwardly and downwardly in the floating mode. Additionally, it would be desirable to have at least one preset or predetermined reel position, and to integrate operation of a reel position control and a header height control, such that when the cutter bar is raised in the floating mode, the header is not always raised. These advantages are achieved by the automatic header control system of the invention discussed hereinbelow. 
         [0035]    Referring also to  FIG. 6 , one embodiment of an automatic header control system  56  constructed and operable according to the present invention is shown. Control system  56  includes at least one reel fore and aft position actuator  58  controllably operable for moving reel  34  generally forwardly and rearwardly in relation to header  22 , at least one reel lift actuator  60  controllably operable for moving reel  34  generally upwardly and downwardly in relation to header  22 , and at least one cutter bar fore and aft position actuator  62  controllably operable for moving cutter bar  30  generally forwardly and rearwardly in relation to header  22 . Combine  20  includes at least one feeder lift cylinder  64 , connected to the front end of combine  20  and feeder  24 , by pinned connections  66 , and controllably operable for moving feeder  24  and header  22  generally upwardly and downwardly in relation to the combine. Each of actuators  58 ,  60  and  62 , and cylinder or cylinders  64 , is preferably conventionally constructed and operable. 
         [0036]    Control system  56  includes a reel fore and aft position sensor  68  operable for outputting information representative of a fore and aft position of reel  34 , a reel lift position sensor  70  operable for outputting information representative of a vertical position of the reel, and a cutter bar fore and aft position sensor  72  operable for outputting information representative of the fore and aft position of cutter bar  30 . System  56  includes a processor based programmable controller  74 , and a plurality of operator inputs  76 ,  78  and  80 , preferably comprising momentary contact switches on a control handle in an operator cab of combine  20 . Controller  74  is connected in operative control of actuators  58 ,  60  and  62 , respectively, via fluid lines  82 , and is connected to sensors  68 ,  70  and  72 , and inputs  76 ,  78  and  80  via conductive paths  84 , which can comprise, for instance, wires of a wiring harness, or a wireless interface. Here, system  56  is configured as a single controller system, and thus controller  74  is also optionally connected in operative control of feeder lift cylinder  64 , via a fluid line  82 , and to a feeder lift position sensor  86  operable for outputting information representative of feeder position, and to position sensor  44  operable for outputting cutter bar height information, via additional conductive paths  84 . Controller  74  will also include a suitable memory. 
         [0037]    As an example in regard to the control of actuators  58 ,  60  and  62 , and lift cylinder  64 , controller  74  can control operation thereof in any suitable manner, for instance, via a system of solenoid valves controllable using variable electrical signals such as variable electrical currents, in the well known manner, for controlling pressurized fluid flow to and from the respective actuator or cylinder. 
         [0038]    Controller  74  is configured and programmed to allow an operator to position cutter bar  30  through a range of fore and aft positions, using a designated one of inputs  76 ,  78  or  80 . The operator can position reel  34  through both a range of fore and aft and vertical positions, as desired or pre programmed, using the others of the inputs. As a result, an operator can achieve a desired reel to cutter bar relationship, for the harvesting characteristics sought, for instance, a desired crop flow into the header. And, as cutter bar  30  and reel  34  are being positioned, controller  74  will monitor the positions of both, and is operable automatically, or optionally responsive to an input command, to store values representative of the cutter bar position and the reel position. From this positional data, controller  74  is operable for determining the positional relationship of the reel to the cutter bar, in two dimensions, vertical and horizontal, as a function of the known physical parameters. Subsequently, in one automatic cutter bar following mode of operation, controller  74  is automatically operable for controlling either or both reel actuators  58  and  60  for moving the reel responsive to movements of cutter bar  30 , for maintaining the positional relationship of the reel to the cutter bar. This is in response to both any additional fore and aft movements of the cutter bar made by the operator, and also automatic vertical movements thereof, resulting from contact between the cutter bar and the ground, such as illustrated by the upward movement denoted by arrow C in  FIG. 4 . As a result, problems such as interference between the reel and cutter bar, as illustrated in  FIGS. 4 and 5 , can be avoided. 
         [0039]    Further, controller  74  is operable to control the reel actuators to follow compound vertical and horizontal movements of the cutter bar, for maintaining the last set or predetermined reel/cutter bar relationship, or to follow at least such portions of those cutter bar movements as required to prevent interference of the reel with the cutter bar that can possibly cause damage, such as to the reel tines. 
         [0040]    Thus, in one automatic reel following mode, as an operator uses the control handle input to move the cutter bar fore and/or aft to a desired position, controller  74  can automatically control the reel to follow the movement, without action by the operator. This following movement can be a function of a predetermined reel cutter bar relationship, or a function of a last operator inputted relationship. 
         [0041]    Generally, in a header height control mode, feeder lift cylinder  64  will be operated to raise header  22  responsive to upward movements of the cutter bar resulting from ground contact, as sensed by position sensor  44 , for such purposes a to limit digging and prevent damage to the sickle and related components. The header will then be lowered, responsive to sensed downward movements of the cutter bar. A benefit of this is that, as a result of the header being raised, the force from the ground contact acting to urge the cutter bar upwardly is reduced or limited, and thus the upward cutter bar movement toward the reel is stopped or slowed, interference between the reel and the cutter bar can be avoided. 
         [0042]    As noted above, controller  74  can be configured for controlling the automatic header height function. Additionally, as an advantage of the invention, this function can be integrated with the reel following function. As a preferred example, the present system can provide an alternative header height control routine, wherein controller  74  will automatically control the reel actuator or actuators in a reel follower mode to raise the reel responsive to the upward cutter bar movements of a lesser magnitude, and then to control the header height via the feeder lift cylinders to raise the header in the header height control mode, only responsive to cutter bar movements of greater magnitude. As a result, smaller upward movements of the cutter bar resulting from ground contact are responded to only by reel movements following the cutter bar movements, whereas greater upward cutter bar movements are responded to by header movements. As an advantage of control in this manner, the reel can be positioned closer to the cutter bar, with less risk of reel/cutter bar interference. As another advantage, a higher down force can be maintained on the cutter bar, as there is less risk of interference between the reel tines and the cutter bar, particularly with regard to rapid upward movements of the cutter bar. 
         [0043]    Referring also to  FIGS. 7 and 8 , as still another feature of the invention, controller  74  can be programmed to store one or more predetermined positions of header  22 , cutter bar  30 , and/or reel  34 , and automatically move them to the predetermined position or positions, responsive to a designated operator input command or commands. In  FIG. 7 , for instance, cutter bar  30  is illustrated in a rearward position within its fore and aft range of movement. Cutter bar  30  can be either fixed, or in a floating or flex mode. Reel  34  is positioned at a rearward and low position within its fore and aft, and height ranges of movement, respectively. This relationship would be representative of those typically used for harvesting a lower stand of, for instance, crops such as soybeans, having a relatively short height E. To achieve this positioning, the stored settings for the positions of actuators  58  and  60  can be recalled for positioning reel  34 , and a stored setting for actuator  62  can be used for positioning cutter bar  30 . Subsequently, if cutter bar  30  is in the floating mode, and rises, as denoted by arrow C, for instance, as a result of ground contact, controller  74  ( FIG. 6 ) will automatically control actuator  60  to raise reel  34  accordingly in a following movement. Additionally, if the operator inputs a command for fore and/or aft movement of cutter bar  30 , the controller, if in the reel following mode, will automatically control actuator  58  and/or actuator  60  to make a following movement for maintaining the reel/cutter bar relationship. And, if the controller is not in the reel following mode, which can be exited by inputting a predetermined command, cutter bar adjustments can be made as desired, with no corresponding automatic reel following action. Optionally, this new set of positions can be stored, such that subsequently, upon inputting of a predetermined input command, the controller will move the cutter bar and reel to these positions. This feature is advantageous particularly when varying height and other crop stand conditions are encountered, and it is desired to have a capability to rapidly and accurately position both the cutter bar and the reel for specific conditions. 
         [0044]    In  FIG. 8 , cutter bar  30  is denoted  30 ′ illustrated in dotted lines in a forward position within its fore and aft range of movement. Cutter bar  30  can again be either fixed, or in a floating or flex mode. Here, reel  34  is positioned at a forward and high position within its fore and aft, and height ranges of movement, respectively. This relationship would be representative of those typically used for harvesting taller stands of crops such as soybeans. With header  22  raised, this configuration would also be typical of a relationship for harvesting a grain such as wheat having a relatively taller height F, compared to height E. To achieve this positioning, additional stored settings for the positions of actuators  58  and  60  can be recalled for positioning reel  34 , and a stored setting for actuator  62  can be used for positioning cutter bar  30 . Then, when harvesting, if cutter bar  30  is in the floating mode, and rises, as denoted by arrow C, for instance, as a result of ground contact when cutting crops, controller  74  ( FIG. 6 ), when in the reel following mode, can automatically control actuator  60  to raise reel  34  accordingly in a following movement. Again, while in the reel following mode, if the operator inputs a command for fore and/or aft movement of cutter bar  30 , controller  74  will automatically control actuator  58  and/or actuator  60  to make a corresponding following movement, for maintaining the reel/cutter bar relationship. And, if the controller is not in the reel following mode, cutter bar adjustments can be made as desired, with no corresponding automatic reel following action. However, in this mode, the controller can be programmed to optionally operate in a background mode to prevent execution of operator inputted commands that would result in reel/cutter bar interference, or which would place the reel and cutter bar in proximity deemed to be a danger of interference, for instance, if the cutter bar were to rise while in the floating mode. 
         [0045]    Referring also to  FIG. 9 , an alternative embodiment of an automatic control system  88 , constructed and operable according to the present invention is shown. System  88  is automatically operable to perform all of the reel following routines discussed above in regard to system  56  for controlling the positions of cutter bar  30  and reel  34  of header  22 . System  88  differs from system  56 , in that a network of separate controllers are used for controlling the respective actuators  58 ,  60  and  62 , and lift cylinder  64 . More particularly, a reel fore and aft (R F A) position controller  90  is connected in operative control of reel fore and aft position actuator  58  via fluid lines  82  and to reel for and aft position sensor  68  and input  80  via conductive paths  84 ; a reel height control (R H C) controller  92  is connected in operative control of reel lift actuator  60  via fluid lines  82  and to sensor  44  and reel lift position sensor  70  via conductive paths  84 ; a cutter bar fore and aft (C B F-A) position controller  94  is connected in operative control of cutter bar fore and aft position actuator  62  via fluid lines  82  and to cutter bar fore and aft position sensor  72  and input  76  via conductive paths  84 ; and a header height control (H H C) controller  96  is connected in operative control of feeder lift cylinder  64  via a fluid line  82 , and to feeder height sensor  86  and input  78  via conductive paths  94 . Controllers  90 ,  92 ,  94  and  96  are connected together via conductive paths  84 , which can comprise a data bus or the like, and suitable interfaces, for sharing positional data of the actuators controlled thereby. Thus, as an example, in the reel following mode controllers  90  and  92  will be programmed to monitor positional data outputted by sensors  44  and/or  72  regarding either or both the fore and aft and vertical position of cutter bar  30 , for changes to which the respective controller will be programmed to respond with a corresponding reel position command. Header height control controller  96  can also be programmed to monitor vertical cutter bar position data, and responsively operate feeder lift cylinder to raise or lower header  22  and feeder  24  in a header height control movement. This illustrates the flexibility of the present systems for incorporation into a variety of controller architectures, including one or more controllers for controlling the various movements involved. 
         [0046]    Thus from a review of the above disclosure, it should be apparent that a control system of the invention, such as either system  56  or system  88  discussed herein, is capable of monitoring cutter movements and responsively moving the reel or header to maintain a desired cutter bar/reel relationship, thus eliminating necessity for complex linkages and/or interlock mechanisms connecting the cutter bar and reel, and any manual adjustment of such apparatus for changing the cutter bar/real relationship. The systems of the invention also have utility for providing preset or stored commands for moving the cutter bar and or reel of a header to any of one or more predetermined positions, both in the fore and aft and vertical directions. Still further, improved operability of a header height control system can be achieved by integration of reel following and header height control functions, wherein for at least some cutter bar movements, responsive reel movements are made in lieu of feeder and header movements. 
         [0047]    It will be understood that changes in the details, materials, steps, and arrangements of parts which have been described and illustrated to explain the nature of the invention will occur to and may be made by those skilled in the art upon a reading of this disclosure within the principles and scope of the invention. The foregoing description illustrates the preferred embodiment of the invention; however, concepts, as based upon the description, may be employed in other embodiments without departing from the scope of the invention. Accordingly, the following claims are intended to protect the invention broadly as well as in the specific form shown.