referring now to the drawings , an agricultural implement embodying the invention is shown in fig1 designated generally by reference numeral 10 . implement 10 is adapted to be connected to a tractor drawbar by means of a tongue , a portion of which is indicated at 12 , forming part of a rigid main frame having a rear portion including generally horizontal 14 and vertical 16 frame members . the frame is transported upon a pair of rear - mounted wheels 18 , one of which is shown in fig1 and gauge wheel 19 . various portions of implement 10 are hydraulically powered and for such purpose hydraulic fluid tank 20 and radiational coolers 22 are provided , being connected to one another and to the hydraulically powered elements by flexible hoses which are conventional and , therefore , not shown in order to simplify the drawing . endless belt 24 , having outwardly projecting , laterally extending lugs 26 , is supported upon the frame for fore - and - aft movement under hydraulic power . the centerline of the implement is assumed to extend down the center of belt 26 . the forward portion of the implement frame is attached and supported with respect to the rear frame portion by a parallelogram linkage including upper and lower links 28 and 30 on each side and is vertically movable with respect thereto by hydraulic cylinders 32 . springs 34 provide a resilient support for the forward frame portion of the machine . a pair of hollow sleeves 36 and 38 are supported at the forward end of the machine , and extending through each sleeve are drive shafts connected at their upper ends to a respective pair of hydraulic motors 40 and 42 , and at their lower ends to flat , circular disks 44 and 46 . sleeves 36 and 38 , and the drive shafts extending therethrough are tilted forwardly at the upper ends at a small angle , but are considered to be substantially vertical . the disks are illustrated as having a conventional , saw - tooth periphery , but may advantageously employ the unique notched peripheral configuration of aforementioned u . s . pat . no . 3 , 999 , 613 . all other structural elements and the manner of operation thereof thus far described may be found in essentially the same form in prior commercial forms of agricultural equipment of this type . the unique features of the present invention are embodied in the structure which supports hollow sleeves 36 and 38 , and thus the drive shafts , motors and disks , for relatively adjustable , lateral movement , which will now be described . the framework at the forward end of the machine includes vertical members 48 and 50 , joined at the top by horizontal member 52 , and at a medial position by horizontal frame member 54 . the support structure is shown in more detail on only one side of the machine in fig2 all elements being duplicated on the opposite side , and equally spaced from the centerline of implement 10 . as seen in fig2 a pair of plates 56 and 58 are welded in spaced , parallel relation to opposite sides of sleeve 36 at a lower position thereon . a second pair of plates 60 and 62 , one being seen in fig2 and both in fig3 and 4 , are welded to opposite sides of sleeve 36 directly above and parallel to plates 56 and 58 . hollow tubular member 64 is rigidly affixed to and extends between plates 60 and 62 , as seen in fig3 and 4 , in alignment with openings in the plates having diameters approximately equal to the inside diameter of tubular member 64 . plates 56 and 58 are joined in the same manner by a hollow tubular member ( not shown ) and include openings aligned therewith . lower and upper horizontal guide members 66 and 68 , respectively , are rigidly affixed to and extend from vertical frame member 70 , and are connected at their opposite ends by vertical support member 72 . support member 74 is rigidly attached at one end to the outer end of guide member 68 and at the other to frame member 48 . simi1arly , support member 76 extends from an attachment to guide member 66 at one end to an attachment to frame member 48 at the other . thus , support members 72 , 74 and 75 provide a rigid support structure , attached to forward portions of the frame of the machine , for guide members 66 and 68 . plate 76 is welded to frame cross member 54 , extending forwardly therefrom , and includes two openings , one of which is denoted in fig2 by reference numeral 78 . bolt 80 extends through the other opening , in the positions of the elements shown in fig2 securing plate 76 and spacer block 82 which in turn is secured by bolt 84 to plate 86 , welded to and extending forwardly from sleeve 36 . the relative positions and manner of attachment of plates 76 and 86 , by means of block 82 and bolts 80 and 84 are also seen in fig4 wherein the elements are in the same position as in fig2 . bracket 88 is welded to flange member 90 which is positioned at one side of and assists in supporting and positioning belt 24 , constituting a portion of the implement frame . bolts 92 and 94 secure block 96 to plates 88 and 98 , respectively , the latter being welded to sleeve 36 . thus , sleeve 36 is fixedly supported with respect to the forward portion of the machine frame near its upper end by plates 76 and 86 , interconnected by block 82 and bolts 80 and 84 , and near the lower end by plates 88 and 98 , block 96 and bolts 92 and 94 . also , bracket 100 is affixed to the mounting flange of motor 40 and by bolt 102 to plate 104 which is welded to frame member 48 , which assists in supporting and stabilizing the upper end of sleeve 36 and the elements carried thereby . it may thus be seen that by removing bolts 80 and 84 at the top , and bolts 92 and 94 at the bottom , as well as bolt 102 , sleeve 36 and the drive shaft , motor 40 and disk 44 may be moved by sliding tubular member 64 , and the like tubular member supported between plates 56 and 58 , upon guide members 68 and 66 , respectively . this changes the position of the axis of rotation of disk 44 relative to the longitudinal axis of the machine since guide members 66 and 68 extend parallel to one another along axes which are arranged at an angle , preferably about 45 °, to the centerline . in moving from the position shown in fig2 and 4 to the position shown in fig3 for example , plates 56 and 60 are moved to the outer extremities of guide members 66 and 68 , respectively , thereby moving the axis of rotation of disk 44 a greater distance from the machine centerline . bolts 80 and 84 may then be replaced with spacer block 106 positioned between block 82 and plate 86 to fill the additional space between plate 76 , which remains stationary , and plate 86 , which has been moved outwardly with sleeve 36 . when bolt 80 is replaced , it extends through opening 78 in plate 76 . likewise , bolt 92 is replaced through opening 108 in bracket 88 and an additional spacer block , corresponding to block 106 , is positioned on the opposite side between block 96 and plate 98 . opening 110 in plate 104 ( fig2 a ) is used for replacement of bolt 102 since bracket 100 also moves linearly as sleeve 36 is shifted between the positions of fig3 and 4 . the elements which have been described on the left side of the machine and which are duplicated on the right side in the plan views of fig3 and 4 are designated by the same reference numerals , with a prime mark thereafter . the structure and operation of such elements is the same on both sides and is therefore not repeated . it may thus be seen that the present invention provides means for selectively varying the spacing of the axes of rotation of the disks . although the particular structure illustrated and described permits adjustment between two discrete positions , other positions within the limits of movement of the elements along guide members 66 and 68 ( and 66 &# 39 ; and 68 &# 39 ;) may obviously be provided , if desired , simply by proper positioning of the openings for the bolts and providing spacer blocks of proper thickness . the axes of rotation of the disks remain evenly spaced on each side of the centerline of implement 10 in all posisions of lateral adjustment . the purpose of providing adjustable spacing of the disk centers , as previously mentioned , is to expand the capabilities of the machine . for example , when the machine is to be used for pulling and severing crops , such as the stems of tomato plants , disks 44 and 46 are placed with their adjacent peripheries in overlapped relation , as in fig4 the usual amount of overlap being about 31 / 2 inches . by changing the elements to the position of fig3 the adjacent peripheries of disks 44 and 46 may be placed in spaced relationship . if a greater space between the disk peripheries is desired beyond that provided when the elements are at the outer limits of movement , disks 44 and 46 may be replaced by disks of smaller diameter , such disks being commercially available in at least two different diameters , namely , 32 &# 34 ; and 291 / 8 &# 34 ;. this would provide a spacing of some 6 &# 34 ; to 8 &# 34 ; of the disk peripheries which is ideal for row forming , i . e ., for preparing the soil for the planting of tomatoes , or the like , in spaced rows . it is also advantageous when using the machine to windrow plants already severed and on the ground . in the latter application , the disks would be rotated at a slower speed , which is adjustable by the use of conventional variable - speed valves on the hydraulic motors which drive the disks . the lower run of belt 26 moves rearwardly as the machine is moved through the field , serving to hold the plants in the desired windrows .
an agricultural implement for movement through a field is adapted to perform a number of functions including severing plant stems from the roots , placing the severed plants in windrows , and preparing soil for planting . the apparatus includes a wheel - mounted frame for attachment to a tractor , a pair of flat discs with notched peripheries mounted for rotation about parallel axes and hydraulic motors for imparting rotation , through drive shafts , to the discs in opposite directions . the discs and their supporting structure are mounted for selectively adjustable movement to vary the spacing of the axes of rotation , thereby placing the disc peripheries in either overlapped or spaced relation . the variable positioning of the disc peripheries governs the function performed by the apparatus and may be augmented by using discs of different diameters as well as by adjusting the spacing of the rotational axes .