fig1 and 3 show schematically the general layout of the header of the type to which the present invention relates . thus the header comprises a main frame generally indicated at 10 including a main longitudinal beam which extends across the full width of the frame and defines the width of the header . the frame further includes a table 11 which is mounted downwardly and forwardly of the main tube 10 a and supported on the main tube by a plurality of braces 12 ( omitted in fig1 for convenience of illustration ). on top of the table 11 is mounted a draper or other conveyor 13 which carries the cut crop material along the header for discharge . at the front of the table is provided a knife support bracket 14 in the form of a generally u - shaped channel facing forwardly of the table . on the bracket 14 is mounted a sickle knife 15 which extends across the full width of the table and acts to cut a standing crop as the header is moved across the ground carrying the crop . the construction of the reel is also substantially the same as that shown and described in u . s . pat . no . 4 , 776 , 155 of the present assignees and a part of fig2 herein is taken from that patent for convenience of illustration and to provide a brief description of the construction of the reel . however the reel can vary in design and is well known to one skilled in the art and therefore will not be described in full detail . the reel comprises a main elongate beam 30 in the form of a cylindrical tube which is mounted on an axle 31 which is mounted so as to allow rotation of the beam 30 about a main longitudinal axis 32 of the beam . the beam carries a plurality of star shaped support elements 33 at spaced positions along the length of the beam with each support element having a number of arms equal to a number of bats 34 carried by the main beam 30 . each bat includes a support shaft 35 which is mounted in a bearing at the end of a respective arms . on the shaft is mounted a bat comprising an elongate body which supports a number of fingers 36 at longitudinally spaced positions along the length of the bat which project from the bat generally outwardly away from the axis 32 . the bat shafts 35 and their longitudinal axis thus rotate about the axis 32 . at the same time each bat pivots about its respective shaft 35 so as to provide a variation in the angle of the fingers 36 relative to an axial plane 37 joining the axis 32 and the shaft 35 . the intention in the movement is to maintain the bat fingers mutually parallel at least as they move through the working zone in which they contact the crop and more preferably throughout the full rotation around the reel axis . in order to achieve this , it is of course necessary that the bat fingers constantly adjust in angle relative to the axial plane passing through the respective bat axis . the control in the movement of the bats is provided by an eccentric drive system generally indicated at 40 . in fig1 and 2 , the eccentric drive system comprises a disc 41 carried on a plurality of cams 42 which are located eccentrically relative to the axis 32 on a suitable support member . the disc 41 is thus free to rotate around its axis 43 which is offset from the axis 32 . the disc carries a plurality of links 44 which extends from a pivot pin 45 on the disc to a pivot coupling 46 at an inner end of a bat pivot arm 47 rigidly connected to the bat for rotation therewith . thus each link 44 pulls and pushes on the arm 47 of the respective bat to pivot the bat about its shaft 35 . in fig2 the star - shaped supports 23 are omitted for convenience of illustration . in fig3 the links and bat crank arms 47 are omitted for convenience of illustration . tie links 48 are connected between each link 44 and the disc so as to hold the link against forward and rearward movements beyond predetermined limits with the links 48 having a slot shaped connection to the disc allowing a change of angle of the link relative to the disc to accommodate the movement of the bats . as previously described in the above patent , this bat angle control system generally indicated at 40 provides advancement and retardation of the angle of the fingers 36 at different positions around the axis 11 . in fig2 the bat control system includes the rotating disk 41 mounted on the plurality of guide rollers 42 so that the disk in effect forms a rotating cam mounted on stationary cam followers defined by the rollers . in fig3 the arrangement is in effect reversed in that a stationary cam guides rotating cam followers 41 a with those cam followers or rollers acting to drive the links 44 and 47 ( shown only schematically ). fig3 shows the different angles of the bats at twenty positions around the axis 32 . the number of bats can vary but generally a pickup of this type will have a number of bats of the order of five or six . in fig1 and 3 five such bats are shown . in fig2 six bats are shown . it will be noted therefore from fig3 that the eccentric location of the axis 43 of the cam 41 a causes the fingers to be at a maximum advanced position at the position indicated at 50 and that a maximum retarded position at the position indicated at 51 . in between these positions the fingers remain substantially parallel as the bats move or sweep between these two positions . thus it will be noted that the bats have an angle b as indicated at the line 52 relative to a vertical plane 53 extending through the bat at each position around its movement . the angle b remains substantially constant between the positions 50 and 51 . the position 50 is located forwardly of the knife 15 and the position 51 is rearward of the position 50 and generally rearward of the knife 15 . each end of the shaft 31 is mounted in a bearing 32 a . the cam 41 a includes a flat disk 41 b which is circular and is carried on bearing 32 a so as to remain stationary as the shaft 31 rotates , the disk 41 b being attached to the bearing 32 a via an adjustment plate 54 fixed to the bearing . the position of the cam 41 a relative to the axis 32 of the shaft 31 can be adjusted manually by rotating the adjustment plate 54 relative to the disk 41 b . thus the cam 41 a is rotated about the axis 32 by selecting one of the slots in the plate 54 and locating a pin in that selected slot to hold the disk 41 b connected to the plate 54 in fixed position when the adjustment is complete . this adjustment , which is a manual adjustment and intended to be effected prior to entry into the field with the equipment , adjusts the angular orientation of the bat angle control system 40 about the axis 32 . this adjustment therefore varies the locations of the positions 50 and 51 and also varies the angles b of the fingers as they sweep over the area of the cutting knife . the pickup reel 16 is carried on the main frame 10 by a pair of forwardly extending arms 17 and 18 which support the pick up reel in position generally above the knife 15 . the support arms 17 and 18 are pivoted at their rear end 19 on the main tube 10 a by a pair of devises 20 and a transverse pin 21 with the pivotal movement being effected by a pair of hydraulic cylinders 17 a . each of the arms 17 and 18 includes the rear generally horizontal coupling portion 19 which connects to the support frame and a main forwardly and downwardly inclined portion 22 . the support arm 17 defines a support surface for a slide member 60 movable along the support arm . as illustrated the support surface is defined by an upper surface 61 of an inverted channel member defining the support arm . the slide member 60 is thus supported on the upper surface 61 so the weight of the reel is applied through the slide plate 60 onto the upper support surface 61 . as best shown in fig4 and 5 , the slide member 60 comprises an end plate 70 which forms a vertical plate parallel to one side wall of the channel member forming the respective support arm . the plate 70 carries on its inside surface the bearing 32 a for the shaft 31 so that the shaft 32 projects through a hole in the plate above the support surface 61 of the support arm . the bearing 32 a is carried in a pair of support plates 71 and 72 which have an upper end attached to the bearing 32 a and extend downwardly and outwardly therefrom to form lower curved ends 71 a and 72 a which sit on the top surface 61 of the support arm . thus the lower end 71 a of the plate 71 is positioned forwardly of the axis 32 of the shaft 31 and the lower end 72 a of the plate 72 is positioned rearwardly of the axis 32 . these lower ends therefore provide support points for resting on the surface 61 and communicating forces from the bearing and the plate 70 downwardly onto the support surface 61 . the slide member defines a forward contact point 71 a and a rearward contact point 72 a which define points of engagement with the support surface 61 . two retaining pins 64 , 65 located underneath the support arm hold the structure in position on the support arm . the slide member thus provides two top points of contact with the support arm with the orientation of the slide member being controlled by the height of the contact points on the side member . the support surface 61 is defined along a major part of the main portion 22 of the arm and also along an upper surface of the downwardly inclined forwardmost portion 23 of the arm . the slide member is moved forwardly and rearwardly by a hydraulic cylinder 66 with a piston rod 67 located on the support arm within the channel shape for engaging and sliding the slide member along the support arm . the end of the rod 67 is attached to the pin 65 by a clevis 68 and the pin 65 carries a bushing 69 to run against the underside of the support arm 17 . it will be appreciated that each of the arms includes a slide member 60 substantially of the arrangement described above . in one arrangement , both slide members include a cam 41 a and related elements as described . in another arrangement , the cam is located only at one side and the opposed slide member is thus less complicated but still acts to support the bearing as described . in this arrangement , the drive to the shaft ( not shown ) can be located at the opposed end . the position of the reel can then be adjusted in the field condition by actuating the cylinder 66 to move the slide member forwardly and rearwardly . as the slide member moves forwardly and rearwardly over the main portion 22 of the arm , the slide member follows the upper support surface 61 so that it is moved forwardly and downwardly as it slides along the main portion . the angle of the main portion 22 is arranged to follow approximately the angle of the table including the draper 13 so that the fingers remain at a constant spacing from the table up to the knife 15 . in fig6 and 8 there is shown the arrangement of the present invention in which there is provided a linkage between the slide member 60 and the cylinder 17 a . in the example shown , this comprises a cable ( or other flexible element ) 100 which pulls on a bell crank 101 . the end of the bell crank is located between the upper end of the cylinder and the arm 17 so that pulling on the cable acts to increase the effective length of the cylinder 17 a and thus raise the arm 17 . in fig7 showing the retracted position of the reel and in movement of the reel up to a predetermined position above the knife , the cable is slack so that the bell crank remains in its rest position with the arm not raised . thus the reel moves through the same height above the cutter bar and conveyor as when the reel is over the header . however , as the reel is pushed forward of the predetermined position above cutter bar shown in fig6 the cable pulls on the bell crank and simultaneously and automatically acts to raise the support arm at a rate relative to the forward movement along the support arm so that the reel moves substantially horizontally , that is parallel to the ground , as shown in fig8 . this is required when cutting crops with the cutter - bar on the ground since otherwise the reel fingers could come into contact with the ground causing potential damage . the slope of the reel support arm controls the height of the reel above the cutter bar and draper so that the reel does not contact the cutter - bar or conveyor as the reel is moved fore and aft . when cutting off the ground ( for example for harvesting rice ) the reel is moved forward and down to pick up the rice and leave as much of the wet stem on the ground as possible . when cutting on the ground ( for example when harvesting soybeans ) the reel is moved forward to pick up down plants ahead of the cutter - bar . it is then necessary to raise the reel to prevent the reel from contacting the ground and possibly damaging the reel or breaking fingers . the present invention allows the reel to follow the slope of the reel support arm as it moves forward , but raises the support arm before the reel contacts the ground . the reel moves forward approximately parallel to the ground ahead of the cutter - bar . this allows the same support arm to be used for all crops . the raising means provided by the cable can be simply and readily disconnected for rice and reconnected for soybeans . since various modifications can be made in my invention as herein above described , and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope , it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense .
a crop harvesting header includes a reel mounted on a pair of forwardly and downwardly extending arms carried on a header frame above a table and cutting knife . the reel is rotatable about a longitudinal axis and includes angularly bats . the arms can be raised and lowered by hydraulic cylinders to raise and lower the reel . a linkage including a cable and bell crank is provided which is responsive to the forward and downward sliding movement of the main elongate beam along the support arms for simultaneously and automatically causing a raising movement of the reel support arms . the cable is slack over a rearward part of the movement so that no lifting occurs . the linkage is arranged relative to a forward and downward slope of the arms such that , over the forward part of the movement , the beam moves substantially horizontally to cause the reel to move forwardly of the knife without moving downwardly into engagement with the ground , for operating with the knife at ground level . the linkage is arranged to be readily dis - engageable by disconnecting the cable such that , when disengaged , the reel support arms are not raised as the beam undergoes the forward sliding movement for operating where the knife is raised above the ground .