Thrashing system for vegetable harvesters

Abstract: A thrashing system for a vegetable harvester including a plurality of tines (36) on an oscillating shaker head (26) which engage vines (v) and shake the fruit (c) such as cucumbers, from the vines. The fruit is collected on a cross conveyor (76) and the vines are pulled through at least one pair of pinch rolls (81, 92) for discharge on the ground. A full width blower (138) directs high pressure air across the cross conveyor to lift and spread the vines allowing disconnected fruit to fall therethrough onto the cross conveyor (76).

Description: The present invention relates to a self-propelled vine crop harvester and more particularly to a threshing system in a cucumber harvester for separating cucumbers from the vine. Mobile vine crop harvesters are well known in the art for harvesting and separating vegetables from their vines or foliage. One such harvester for harvesting is disclosed in US 4 335 570. A similar proposal is disclosed in US 42 32 506. The vines are fed in between a rotary shaker having radially extending fingers and stationary guides; e.g. a rotary drum with arcuate guide rods around the drum. DE 24 43 135 discloses a harvester, in particular for tomatoes. Along the conveyor several pinch roll pairs are spaced from each other which are combined with transport worms for guiding the vines after separation from the fruits. A ventilator is provided as means for directing a blast of high pressure air against the vines and the crop the latter being allowed to fall on a transverse conveyor due to its specific weight which is larger than that of the vines. An object of the present invention is a harvester with improved means to separate the vines from the crop. This object is achieved with a vine crop harvester according to claim 1, and a method according to claim 6. The threshing system includes a rotating vibratory thresher having a plurality of flexible fingers which receive the foliage or vines of a plant severed from the ground and share substantially all of the fruit of the plant free from the foliage. Most of the fruit is separated from the plants by the shaker with the fruit being collected on a fruit conveyor which is substantially equal in width to the width of the harvester. In different embodiments of the invention, the foliage may be urged outwardly or inwardly of the rotary thresher; and several types of air blasts from blowers are employed to lift and separate the foliage for dislodging the fruit from the vines. Double pairs of foliage pinch rolls are used to pull the vines through the harvester and to disconnect the very minor portion of the fruit which is not separated from the vine by the thresher. Fig. 1 is a diagrammatic longitudinal central section of portions of a cucumber harvester illustrating a first embodiment of the threshing system of the present invention. Fig. 2 is an enlarged central section of certain threshing components of the harvester illustrating resilient vine guides. Fig. 3 is an enlarged plan view of the foliage engaging components of the threshing system looking in the directions of arrows 3-3 in Fig. 2. Fig. 4 is an exploded perspective of one end portion of two pairs of cooperating upper and lower pinch rolls illustrating torque arms for relieving stresses on the upper motors. Fig. 5 is a diagrammatic longitudinal central section of a second embodiment of the invention with a threshing rotor driven in the opposite direction relative to that of the first embodiment. Fig. 6 is a side elevation illustrating a modified blower and baffle which directs a blast of high pressure air upwardly between a fruit conveyor and foliage pinch rolls, and also across a cross conveyor. A self-propelled harvester (10), such as a cucumber harvester, is diagrammatically illustrated in Figure 1 and includes a chassis 12 supported on two pair of wheels 14,16. An inclined pickup conveyor 18 is supported on the chassis 12 and receives vines or foliage V (Fig. 2) and the attached crops such as cucumbers C, which vines are cut from the ground by a plurality of driven vine cutters 20 (only one being shown); or alternately by a transversely elongated cutter blade (not shown) which extends the full width of the harvester and is supported by the inclined pickup conveyor. In response to driving the harvester 10 through the field to be harvested, the vines V and cucumbers C are received by the conveyor 18, which is driven by a hydraulic motor 22 (Fig. 3), and are discharged within a bin 24 upon a threshing or shaker head 26 (Fig. 2 and 3). The shaker head 26 is substantially the same as that disclosed in the aforementioned Fitzmaurice Patent 4,335,570. More particularly, the shaker head includes a drive shaft 28 (Fig. 3) journaled on a frame 30 supported by the chassis 12 of the harvester. The drive shaft is coupled to and driven by a hydraulic motor 32 (only a portion being shown). An elongated tubular shaft 34 is freely journaled on the shaft 28 and has a plurality of vine engaging tines 36 projecting radially outward therefrom. It will be noted that the tines of the shaker head 26 are driven in the direction of the arrow (Figs. 1 and 2) so that the vines move over the top of the shaker head 26 above the axis of the shaker head. An eccentric weight assembly 37 (Fig. 3) includes a pair of spaced, generally rectangular plates 38,40 rigidly secured to the tube 34 and having their corners connected together by spacer bars 42 for strengthening the assembly. A pair of shafts 44,46 are journaled in plates 38,40 and have 180° offset eccentric weights 48,50 rigidly secured thereto. Chain drives 52,54 are of equal drive ratios and are connected between the drive shaft 28 and the shafts 44,46, respectively, thereby driving the weights at the same speed during operation of the harvester thus causing an oscillatory or vine shaking motion to the tines. It will be apparent that the speed of rotation of the eccentric weights 48,50 is substantially independent of the rotation, if any, of the tubular shaft 34 since the tubular shaft rotates freely with respect to the drive shaft 28. The eccentric weights rotate as a component of the tubular shaft 34 which is journaled on the driven shaft 28. However, the oscillatory motion imparted by the weights is much greater than the motion due to frictional force between the tubular shaft and the driven shaft 28, thus the motion of the tines is basically an oscillatory motion with very little tendency to rotate in the direction of rotation of the driven shaft 28. A hydraulic motor 56 is coupled to the tubular shaft 34 by a coupling 58. A bearing 60 within the adjacent end of the shaft 34 rotatably receives the end of the driven shaft 28, and a second bearing 62 rotatably supports a small diameter portion of the coupling 58. Thus the motor 56 allows the shaft 34 to oscillate while positively causing the shaker head 26 to be driven in the direction of the arrows (Figs. 1 and 2) over the top of the shaker head. The speed of rotation of the shaker head 26 and the movement of the vines can be controlled by regulating the amount of flow to the motor 56. The hydraulic motor 56 (Fig. 3) is of the type that will slip internally to allow the motor shaft and coupling 58 to oscillate while positively allowing the tube and tines 36 to be oscillated by the motor 32. The motor 56 is a gear motor. The direction of rotation of the motor 32 is opposite to that of the shaker head 26 so that the rotational motion due to frictional forces between the tubular shaft 34 and the oscillating shaft 28 is opposed to that of the shaker head 26. This feature prevent "run-away" of the shaker head 26 and also results in a larger amplitude of the tines 36 resulting in a more aggressive shaking of the vines passing over the shaking head 26. In order to assure that the vines and fruit are properly retained in the shaker head 26 and engaged by the oscillating tines 36, a plurality of flexible strips 64 are secured to a transverse bar 66 of the bin 24. The strips are formed from flexible materials such as rubber hose, belting, or plastic strips. As illustrated in Figures 1 and 3, when no vines and fruit are present, the strip 64 will be substantially vertical, but when the vines and fruit are moving therethrough the straps will bow (Fig. 2) outwardly in accordance with the volume of vines passing therethrough. A driven fruit conveyor 68 is mounted within the lower portion of the bin 24 and extends substantially the full width of the bin. The fruit conveyor includes an elongated idler roll 70, an elongated driven roll 72, and a wide belt 74 trained thereover for receiving fruit such as cucumbers C along with debris, such as dirt, leaves and vine portions. The fruit and debris are discharged over the driven roll 72 onto a driven cross conveyor 76 which advances the fruit onto an elevator 78 for discharge into a truck or the like (not shown) as is conventional in the art. The cross conveyor 76 is supported on end rollers journaled on side walls 77 and 77′, with the side wall 77′ projecting upwardly to act as an air deflector and vine guide. Figure 4 illustrates the structure for mounting one end of two pair of pinch rolls of a pinch roll assembly 79 to the left wall 80 (only a fragment being shown) of the frame 30 of the harvester 10. Two lower rollers 81,82 extend the full width of the harvester and are journaled in bearings (not shown) secured to the side wall 80 (only a fragment being shown) of the harvester. Hydraulic motors M1 and M2 are bolted to the side wall and are connected to the roll shafts by couplings 88,90. The motors M1 and M2 drive the lower rollers in the direction indicated by arrows. Upper rollers 92,94 are secured to the shafts 96,98 which are journaled in bearings 100,102 bolted to a rocker arm 104 pivoted to a fork 106 by a pin 107 in a lever 108 that is pivoted to a side wall of the harvester at 110 (Figs. 2 and 4). A hydraulic cylinder 112 is pivotally connected between the lever 108 and a portion of the frame at 113 (Fig. 2) and provide about 200 psi or 200 x 0.689·10⁴ N/m² downward pressure against the lower pinch rolls 81,82 or vines therebetween. A conventional hydraulic circuit (not shown) with a four-way valve and a pressure relief valve set at about 200 psi or 200 x 0.689·10⁴ N/m² is provided for applying and maintaining the desired pressure during harvesting, and for raising the rollers 92,94 about 3 inches (3 x 25.4 mm) above the lower rollers 81,82 for cleaning. An important feature of the invention is that the torque arms 114,116 are welded to the rocker arm 104 for resiliently mounting the housings of the hydraulic motors M3,M4. This permits the motor housings to flex slightly when encountering heavy loads of vines passing between the four pinch rolls; and also permits the rocker arm 104 to raise to accommodate the load and to pivot about axis 107 as different amounts of vines pass between the upper and lower pinch bars. As shown in Figure 4, the torque arm 114 is received in a slot 118 in an arm 120 that is welded to a plate 122 to which the housing of the motor M4 is rigidly secured. Motor shaft 124 is connected to shaft 98 of the upper pinch roller 94 by a flexible coupling 126. Similarly, an end portion of the torque arm 116 is received in a slot 128 in the arm 130 that is welded to the mounting plate 132 of the motor M3. Motor shaft 134 is connected to shaft 96 of the pinch roll 92 by a coupling 136. As best shown in Figure 2, a driven blower 138 is mounted on the chassis 12 below the bin 24. The blower has an air outlet 140 extending the full width of the harvester for directing a blast of air above the cross conveyor 76 and upwardly through the vines V and cucumbers C for lifting the vines and blowing loose debris such as dirt, leaves and broken vines away from the harvester and cucumbers. The wall 77′ aids in deflecting the air upwardly. In operation of the vegetable harvester 10 (Figs. 1-4) of the first embodiment of the invention, the harvester is driven through the field being harvested. When harvesting cucumbers C, the vines or foliage is preferably cut, although in loose or wet soil the vines may be pulled from the soil without cutting, and the crop along with the vines is moved upwardly by the conveyor 18 and are deposited within the bin 24 on the tines 36 which are oscillated thereby releasing substantially all of the cucumbers from the vines V, which released cucumbers fall on the driven fruit conveyor 68 and are discharged onto driven cross conveyors 76. The flexible straps 64 maintain the vines V in engagement with the tines while being threshed. As the vines move toward the pinch rolls 92,81 and 94,82, a full width blast of air from blower 138 lifts and separates the vines while blowing debris upwardly off the cross conveyor 76. The vines V and a few cucumbers C then enter the first pair of pinch rolls 92, 81 which dislodges cucumbers C that remain attached to the vines. A vine gripping pressure of about 200 psi or 200 x 0.689·10⁴ N/m² is applied to the two hydraulic cylinders 112 (only one being shown) to urge pinch rolls 92,94 downwardly thereby firmly gripping and pulling vines out of the harvester for discharge on the ground rearwardly of the harvester. The cucumbers on the cross-conveyor are conveyed onto the conventional elevator 78 for discharge into a truck (not shown) which is driven parallel to the harvester as is conventional in the art. A second embodiment of the invention is illustrated in Figure 5 and is similar to that of the first embodiment except that the shaker head 26a is driven in the opposite direction so that the tines 36a move in a counterclockwise direction as indicated by the arrow causing the vines to move below the axis of the shaker head. Since the second embodiment of the invention is quite similar to that of the first embodiment, parts of the second embodiment which are equivalent to those of the first embodiment will be assigned the same numerals followed by the letter "a". The self propelled harvester 10a (Fig. 5) includes a chassis 12a supported on two pair of wheels 14a and 16a. As the harvester is driven through the field of cucumbers or the like, horizontal vine cutter 20a cuts the vines. The vines and crop are then conveyed to the shaker head 26a by driven conveyor 18a for discharge into the bin 24a. The counterclockwise rotating shaker head 26a moves the vines and fruit over a plurality of spaced rods 144 (only one being shown) supported by a wall 146 so as to maintain the vines in engagement with the oscillating tines 36a while advancing the vines toward a pinch roll assembly 79a. The fruit that is shaken from the vines falls through the spaced rods 144 onto a fruit conveyor 68a which discharges the fruit onto a cross conveyor 76a. As in the first embodiment of the invention, the cross conveyor transports the fruit to an elevator 78a for discharge from the harvester 10a. The vines are pulled through the shaker head 26a by the pinch roll assembly 79a for discharge rearwardly of the harvester 10a. The harvester additionally differs from that of the first embodiment in that high pressure air from the blower 138a is not all deflected upwardly but allows a portion thereof to blow over the cross conveyor 76a which will assist in blowing dirt and debris rearwardly and downwardly of the harvester under the path of movement of the vines that pass through the pinch roll assembly 79a. In operation of the second embodiment, the thrashing action of the shaker head 36a causes a major portion of the fruit, such as cucumbers, to fall between the rods 144 directly onto the fruit conveyor 68a thereby separating the major portion of the fruit from the vines. The vines and a small remaining portion of fruit are pulled against the pinch rolls of the pinch roll assembly 79a thereby causing most of the remaining fruit on the vines to fall onto the cross conveyor 76a. The full width blower blows sufficient air upwardly between the fruit conveyor 68a and the pinch roll assembly 79a thereby lifting and separating the vines before the vines enter the pinch roll assembly thus allowing the loose fruit supported on the vines to fall free from the vines onto the cross conveyor 76a. A portion of the air also flows over the cross conveyor and under the pinch roll assembly 79a thus discharging leaves and trash rearwardly of the harvester 10a. The relatively clean fruit on the cross conveyor 76a is transferred into the elevator 78a for discharge from the harvester into a truck or the like as is conventional. Figure 6 diagrammatically discloses a third embodiment of the invention illustrating an air control system wherein the full length blower 138b blows all of the air upwardly between the discharge end of the fruit conveyor 68b and the inlet end of the pinch roll assembly 79b thereby more effectively lifting and separating the vines allowing the fruit to more readily fall onto the cross conveyor 76b. A baffle 148 secured to the frame (not shown) of the cross conveyor 76b prevents loss of air between the cross conveyor and the pinch roll assembly 79b. From the foregoing description it is apparent that several embodiments of a threshing system for a vegetable harvester have been disclosed. Each system uses an oscillating shaker head having a plurality of tines thereon which penetrate the vines for shaking substantially all of the cucumbers (or fruit) therefrom, which fruit is received on conveyors for collection. The vines are drawn by the driven pinch rolls which firmly grip the vines and release fruit that remain attached to the vines for discharge into the conveyors. A blower directs a high pressure blast of air across a cross conveyor for lifting and separating the vines allowing loose fruit laying on the vines to fall onto the cross conveyor and to discharge dirt, leaves and trash from the conveying system.

Claims: Vine crop harvester for separating crop such as cucumbers from their vines which are severed at the ground and then elevated and deposited in a threshing system of the harvester, the threshing system comprising: a chassis (12); an oscillating shaking head (26) having tines (36) and including a rotatable shaft (34) to which the tines are secured and wherein the vines (V) when engaged by the tines move over or under the shaft during oscillation of the oscillating shaker head; means (64) for urging the vines downwardly toward the rotatable shaft for maintaining the vines in engagement with the tines for a substantial arc around the rotatable shaft for removing the crop (C) from the vines in response to oscillation of the shaking head, characterized by means (138) known per se for directing a blast of high pressure air against the vines and the crop separated from the vines dropping from the fines at a discharge location of the rotational path of the shaking head; one pair of driven upper pinch rolls (92,94), and one pair of driven lower pinch rolls (81,82) known per se journaled on said chassis (12) for gripping the vines; both pairs of upper and lower pinch rolls (92, 94; 81, 82) having a common movement path for the vines and being positioned in the path of the high pressure air for receiving the vines borne on the high pressure air and separating any remaining crop from the vines which were not separated by the shaking head and urging means; first and second transversely spaced rocker arms (104) disposed above said first and second lower pinch rolls (81, 82); first and second transversely spaced lever arms (108) journaled on said chassis (12) and pivotally connected to said first and second rocker arms (104), respectively; first and second hydraulic cylinders (112) connected between said chassis (12) and said first and second lever arms (108), respectively; said first and second upper pinch rolls (92, 94) journaled on said rocker arms (104) and driven by means of first and second motors (M1, M2) and disposed in vine gripping position above said first and second lower pinch rolls (81, 82); third and fourth motors (M3, M4) each having a housing and a shaft coupled in driving engagement to said first and second upper pinch rolls (92, 94), respectively. Vine crop harvester according to claim 1, characterized by first and second motor supporting arms (120, 130) having slots (118, 128) therein and being rigidly secured to the housings of said third and fourth motors (M3, M4), respectively; and first and second torque arms (114, 116) rigidly secured to opposite end portions of one of said rocker arms (104) and having end portions movable received in corresponding recesses of said first and second motor arm slots (118, 128), said first and second torque arms (114, 116) deflecting in response to abrupt high torques being applied to said third and fourth motors (M3, M4) due to variations in the volume of foliage moving between said pairs of upper and lower pinch rolls (92, 94; 81, 82). Vine crop harvester according to claim 1 wherein said hydraulic cylinders (112) each apply about 200 pounds per square inch (200 x 0,689.10² N/m²) of downward force to each lever arm (108) for maintaining a firm vine gripping force between said upper and lower pinch rolls (92, 94; 81, 82). Vine crop harvester according to claim 1 wherein said rocker arms (104) allow said first and second upper pinch rolls (92, 94) to pivot relative to said first and second lever arms (108) in response to receiving vines of uneven thickness passing between said upper and lower rolls. Vine crop harvester according to claim 4 wherein each hydraulic cylinder (112) is actuated to raise said upper pinch rolls (92, 94) above said lower pinch rolls (81, 82) to aid in cleaning said rolls. A method of use of the vine crop harvester according to claim 1 for harvesting fruit attached to vines growing in the ground, comprising the steps of: moving the harvester through the vines, which are severed at the ground; elevating the vines and attached fruit; releasing the vines and attached fruit on tines of an oscillating shaker head for shaking a majority of the fruit free from the vines while rotating in a predetermined direction; urging the vines downwardly toward the rotatable shaft for maintaining the vines in engagement with the tines for a substantial arc around the rotatable shaft; directing a blast of high pressure air against the vines and separated fruit for lifting and separating the vines for releasing the fruit therefrom; directing the vines through the pinch rolls for firmly gripping and pulling the vines; and separately collecting the fruit and discharging the vines from the harvester. A method according to claim 6 wherein said oscillating shaking head is oscillated about an axis of rotation and wherein the vines and fruit move over said axis of rotation. A method according to claim 6 wherein the oscillating shaking head is oscillated about an axis of rotation and wherein the vines and fruit move over said axis of rotation; and additionally comprising the step of confining the vines and fruit within a passage encompassing the outer end portions of the tines for more effectively shaking the vines and guiding the dislodged fruit for separately collecting the same. A method according to claim 6 wherein said oscillating shaker head is oscillated about an axis of rotation and wherein the vines and fruit move under said axis of rotation; and additionally comprising the step of urging the vines toward said axis of rotation for maintaining the vines in engagement with said tines for a substantial arc around said axis for efficiently removing the fruit from the vines in response to oscillation of the shaking head.

Inventors: BUTLER LEE D, LENKER DON H, ORLANDO FRANKLIN P, BUTLER, LEE D., LENKER, DON H., ORLANDO, FRANKLIN P.
Applicants: FMC CORP, FMC CORPORATION
Application year: 1989
Main classification: A01D45
IPC codes: A01D45