JP2011155956A - Harvester for subterranean stem crop - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate such trouble that a film sheet is entwined with a transporting conveyor part in a harvester designed to nip subterranean stem crops planted in a field covered with the film sheet with the uprooting transporting conveyor, to uproot the crops and to transport the uprooted crops. <P>SOLUTION: The harvester for the subterranean stem crops includes film sheet-pressing rollers 30a disposed in nearly right-left symmetry on the right and left of a nipping starting end 6d of the uprooting transporting conveyor; and the plurality of pressing rollers 30a, respectively installed on the right and left in the front and rear. At least one pair of the adjacent front and rear pressing rollers 30a is freely rotatably installed on the side of the rotation end of one vertical rotation arm 30b vertically rotating around a rotation shaft 30c on the side of a frame fixed to the side of an uprooting transporting conveyor frame 6e as the center. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a harvesting machine provided with a pulling conveyer for holding and harvesting the stems and leaves of underground stem crops and root vegetables planted in a field covered with a film sheet.

  Japanese Patent Laid-Open No. 9-233925 (Prior Art 1) discloses a “root vegetable harvesting machine” as a conventional technique for harvesting machines such as rhizome crops equipped with this type of drawing conveyor. For this, “the film sheet (S) floats in the vicinity of the front end portion of the sandwiching and conveying device (11), acting on the lateral side of the row of cultivation holes of the film sheet (S) covered with the farm field. There is a description of a root vegetable harvesting machine, which is provided with a sheet winding prevention guide (30) for preventing it from being wound around the starting end of the sandwiching and conveying apparatus (11).

JP-A-9-233925 (Prior Art 1)

  When harvesting is performed in a harvesting machine equipped with a pull-out conveyor that holds and removes the foliage of underground stem crops and the like planted in multiple strips in a field covered with film sheets, it extends from the holes formed in the film sheets. In some cases, the bulb portion interferes with the hole and the film sheet is lifted up when being pulled up while pinching the foliage, and the film sheet is pulled up and drawn into the pulling and conveying conveyor portion. For this reason, as in the prior art 1, a holding member for a film sheet is provided on the side of the holding start end of the drawing and conveying conveyor. However, due to the unevenness of the planting field scene and the unevenness of the traveling part of the harvesting machine, the pressing part could not follow during work, and the film sheet was lifted and pulled out and pulled into the conveyor conveyor part, causing problems such as winding .

  Therefore, the purpose of the present invention is to eliminate the problem of film sheet wrapping around the conveyor conveyor in a harvesting machine that pulls out and transports a rhizome crop planted in a field covered with a film sheet by pulling it out by a conveyor. It is intended.

  In order to solve the above-mentioned problems, in the harvesting device for rhizome crops planted in a field covered with a film sheet, the harvesting device is harvested by a pair of left and right belt conveyors obliquely arranged rearward from the front to the rear. A pull-out conveyor unit that pinches and removes the foliage part of the crop, and a film sheet pressing roller provided on the left and right sides of the holding end of the pull-out conveyor unit. It is arranged symmetrically, and has a plurality of pressing rollers on the left and right sides, and at least one pair of the front and rear pressing rollers is vertically moved around a horizontal frame side rotation axis fixed to the frame side of the pulling conveyor. A rhizome which is rotatably provided on the rotating end side of one up-and-down rotating arm To propose a harvester of things.

  Further, in the harvesting device for underground stem crops planted in a field covered with a film sheet, the harvesting device sandwiches the stems and leaves of the harvested crops by a pair of left and right belt conveyors inclined obliquely from the front to the rear. And a film sheet pressing roller provided on the left and right of the drawing conveyance conveyor clamping start end, and the film sheet pressing roller is disposed substantially symmetrically on the left and right of the drawing conveyance conveyor clamping center, There are a plurality of pressing rollers on the left and right, respectively, and at least one pair of front and rear pressing rollers are vertically moved around a horizontal frame-side rotation axis where the front-side pressing roller is fixed to the frame side of the pull-out conveyor. A rear holding roller is provided on a rotating upper and lower rotating arm so that the rear pressing roller is a front pressing roller. Suggest harvester rhizome crops, characterized in that is provided rotatably on the roller side vertical pivoting arm which pivots up and down around a horizontal roller side rotation shaft provided on the side.

  Further, in the harvesting device for underground stem crops planted in a field covered with a film sheet, the harvesting device sandwiches the stems and leaves of the harvested crops by a pair of left and right belt conveyors obliquely inclined from the front to the rear. And a film sheet pressing roller provided on the left and right of the drawing conveyance conveyor clamping start end, and the film sheet pressing roller is disposed substantially symmetrically on the left and right of the drawing conveyance conveyor clamping center, A first pressing roller located in the vicinity of the drawing and conveying conveyor clamping start end, a second pressing roller located at a position behind the drawing and conveying conveyor clamping start end, and a third pressing roller located behind the second pressing roller, The first pressing roller and the second pressing roller are water fixed to the frame side of the drawing conveyor. The third pressing roller is rotatably provided on a vertical rotating arm that rotates up and down around a frame-side rotating shaft in the direction, and the third pressing roller is centered on a horizontal roller-side rotating shaft provided on the second pressing roller side. A rhizome crop harvesting machine is proposed, which is rotatably provided on a roller-side vertical rotating arm that rotates vertically.

  Furthermore, the lateral arrangement width of the pressing rollers located on the left and right sides of the pulling conveyer sandwiching center is the lateral arrangement width of the pressing rollers located on the rear side of the lateral arrangement width of the pressing rollers located near the pulling conveyer sandwiching start end. A rhizome crop harvester according to any one of columns 0006 to 0008, characterized in that is narrow.

  According to this device, the pair of front and rear pressing rollers adjacent to each other is a rotation end of one vertical rotation arm that rotates up and down around a horizontal rotation axis fixed to the frame side of the drawing conveyor. It is provided so that it can rotate freely on the side, so that the two pressing rollers on the rotating end side can reliably follow the unevenness of the surface of the field, and the pulling conveyor conveyor clamping start end can be Even if it moves, the film sheet is flexibly followed and the film sheet is pressed, so that it is prevented from being caught in the drawing and conveying conveyor section. Further, by being arranged on the left and right sides of the drawing conveyance conveyor holding start portion, even when the root is caught by the film sheet when the crop is pulled out, the film sheet is prevented from being lifted by reliably pressing the four sides. In addition, the configuration in which one set of pressing rollers is provided on one vertical rotation arm enables compact installation in a narrow space, and the structure is simple and the cost can be reduced without increasing the cost.

Side view of a rhizome crop harvester embodying the present invention Plan view of a rhizome crop harvester embodying the present invention Rear view of rhizome crop harvester embodying the present invention Side view of the harvester showing the harvest situation of rhizome crops Side view of the main part of the pressing roller part of the film sheet Cross-sectional plan view of the main part of the film sheet pressing roller Explanatory drawing of the pressing roller part of another Example of this invention

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a rhizome crop harvester embodying the present invention, FIG. 2 is also a plan view, FIG. 3 is also a rear view, FIG. 4 is a side view of the harvester showing the harvest situation of rhizome crops, and FIG. FIG. 6 is a plan sectional view of the main part of the pressing roller part of the film sheet, and FIG. 7 is an explanatory view of the pressing roller part of another embodiment of the present invention. .

  A rhizome crop harvester according to an embodiment of the present invention includes a self-propelled vehicle body 1, a cockpit 2, an operation device 3, a rhizome crop harvesting device 4, and an operator riding section 5. ing. The self-propelled vehicle body 1 is self-propelled by the crawler device 1 a and travels by the pilot of the pilot sitting in the cockpit 2. The operator operates the operation device 3 to drive the harvesting device 4.

  The harvesting device 4 conveys the rhizome crop C provided in the drawing and conveying conveyor unit 6, the root conveying blade 6 provided in the vicinity of the starting end of the drawing and conveying conveyor unit 6, and the pulling and conveying unit 6 provided obliquely upward and downward. On the way, the foliage cutting part 8 that cuts and separates the foliage part L and the foliage stem part U of the rhizome crop C, the underground stem receiving part 9 provided below the foliage part cutting part 8, and the underground stem part U are moved so as to be mounted. The root moving part 10a and the hair root cutting part 10 which has the hair root stem cutting blade 10b which cut | disconnects the hair root part R and the stem S from the underground stem part U, and the mounting board 16 which mounts a storage container are provided.

  The worker's riding section 5 is composed of a seat. In this embodiment, the seat includes two seats arranged in a direction orthogonal to the traveling direction, and is provided adjacent to the bulb moving body 10a of the follicle cutting unit 10 and facing the traveling direction.

  The pulling and conveying conveyor unit 6 is disposed obliquely with a pair of left and right elastic endless belts 6a and 6a positioned at the front upstream side at the bottom and the rear downstream side at the top, and the left and right elastic endless belts 6a and 6a are at the rear top Between the drive pulley 6b located at the front and the driven pulley 6c located at the lower front, the opposing surfaces are opposed to each other from the left and right, move from the front lower part to the rear upper part, and endlessly rotate. At the leading end of the drawing / conveying conveyor section 6, a foliage guide 13 having a shape in which the front is opened in a C-shape in plan view toward the drawing / conveying apparatus holding start end 6 d is provided.

  A root cutting blade 7 is provided in the vicinity of the starting end of the drawing / conveying section 6. The root cutting blade 7 is stretched around the tip of a root cutting frame 7a that is pivotally supported by the frame of the drawing and conveying conveyor unit 6 so as to be rotatable in the front-rear direction, and is L-shaped in a front view. It passes through the lower part of the rhizome crop C in the soil and rocks back and forth to swell and soften the soil around the rhizome and cut a part of the root.

  The foliage cutting unit 8 provided in the drawing conveyor unit 6 is composed of two opposing circular rotary cutters 8a and 8a provided at the lower part of the elastic endless belt 6a of the drawing conveyor unit 6. The rhizome crop C is cut and separated into a foliage portion L and a rhizome portion U of the rhizome crop C in the middle of conveyance.

  A leaflet 11 made of an endless chain conveyor is provided at a position that becomes the downstream end at the upper end of the drawing and conveying conveyor unit 6. The leaflet body 11 is provided with the upstream end portion of the endless chain conveyor adjacent to the downstream end portion of the pulling and conveying conveyor portion 6, and only the leaf portion L cut by the leaf portion cutting portion 8 is hooked. 11 is discharged from a leaf chute 12 connected to the downstream end of the leaf 11.

  A sheet that is positioned behind the leading end of the pulling and conveying conveyor 6 in the direction of travel and on the unharvested crop side of the pinching part of the foliage and that cuts the film sheet F covering the crop planting ridge G in the direction of travel as the machine progresses. The cutter 20 is provided in the lower part of the drawing and conveying conveyor frame 6e of the drawing and conveying conveyor unit 6.

  The sheet cutter 20 is composed of a vertical disk with a sharp outer periphery that is freely rotatable by a horizontal cutter rotation shaft orthogonal to the traveling direction. In this embodiment, the sheet cutter 20 is moved forward by the drive motor 20b. The film sheet F is cut by forcibly rotating the front side at a higher speed to penetrate the outer periphery of the tip into the soil. Cutting can also be performed by rotating without forced driving. By cutting the film sheet F, the film sheet F can be easily collected from the field after harvesting.

  The rhizome receiving part 9 consists of a belt conveyor in this embodiment, and moves in a direction orthogonal to the traveling direction. The bulb moving body 10a of the hair root cutting part 10 is aligned with the chain conveyor 101 provided in the approximate center of a horizontally long frame adjacent to the underground stem receiving part 9 made of a belt conveyor in the traveling direction of the chain conveyor 101. A large number of buckets 102 are attached.

  When the worker of the rider's riding part 5 puts the underground stem U that has been cut by the foliage cutting part 8 and dropped on the underground stem receiving part 9 on each bucket 102 one by one, the hair root cutting part 10 causes the hair root part. R and the extra length stem S are cut.

  The hair root cutting blade 10b of the hair root cutting unit 10 includes a hair root cutter 106 and a stem cutter 107, which are rotary circular blades provided on the left and right sides of the downstream side of the chain conveyor 101. Each cutter is rotated by a rotation axis in a direction orthogonal to the traveling direction of the chain conveyor 101, and the hair root portion R of the underground stem U and the stem S portion having an extra length are placed and moved on each bucket 102. Disconnect.

  By placing the storage container on the mounting plate 16 on the lowermost downstream side of the bulb moving body 10a of the hair root cutting part 10, the underground stem part in which the root part and the stem part are cut can be stored. Moreover, the underground stem part transferred by the underground stem receiving part 9 can be accommodated by mounting the storage container on the mounting plate 16 on the lowermost downstream side of the underground stem receiving part 9 made of a belt conveyor. The mounting plate 16 can be folded inward at the lateral outer half in the traveling direction, and the width of the mounting plate 16 can be narrowed during movement.

  At the left and right ends of the drawing and conveying conveyor holding start end 6d at the front end of the drawing and conveying conveyor section 6, film sheet pressing sections 30 are provided, which will be lifted by the rhizome crop that is pinched by the drawing and conveying conveyor section 6 and pulled upward. Press down the film sheet F.

  The film sheet pressing unit 30 includes three pressing rollers 30a provided on the left and right sides in the vicinity of the drawing and conveying conveyor clamping start end 6d of the drawing and conveying conveyor unit 6, and includes a foremost first pressing roller 321 and a rear first pressing roller 321. The two pressing rollers 322 are rotatably provided on the rotation end side of the vertical rotation arm 30b that rotates up and down around the horizontal frame-side rotation shaft 30c fixed to the drawing and conveying conveyor frame 6e. The third pressing roller 323 located behind the second pressing roller 322 rotates up and down on the roller side that rotates up and down around a horizontal roller side rotation shaft 30d provided on the vertical rotation arm 30b of the second pressing roller 322. The moving arm 30e is rotatably provided on the rotating end side. A chain is spanned from the rotating end side of the roller-side vertical rotating arm 30e to the drawing / conveying conveyor frame 6e, and below the third pressing roller 323 when the front portion of the drawing / conveying conveyor unit 6 is raised. Is restricted.

  When the drawing roller conveyor frame 6e moves up and down as the pressing roller 30a moves up and down, the film sheet F is pressed down following the unevenness of the ridge G. The third pressing roller 323 is on the rotating end side of the roller-side vertical rotating arm 30e that rotates up and down around a horizontal roller-side rotating shaft 30d provided on the vertical rotating arm 30b of the second pressing roller 322. By the structure provided so that rotation is possible, it follows at the position which rotates more greatly than the pressing roller 30a (2nd pressing roller) which follows with the rotation radius by the up-and-down rotation arm 30b of the 2nd pressing roller 322, and the radius. Since the pressing roller 30a (third pressing roller) can flexibly follow up and down fluctuations, the pressing performance is excellent. Although the first pressing roller 30a of this example hangs downward by its own weight and presses the film sheet F, it may have a structure in which the first pressing roller 30a is biased downward by a spring 30g like the second pressing roller 322.

  FIG. 7 shows another embodiment of the film sheet pressing portion. (A) is a pair of pressing rollers 30a and 30a adjacent to each other on the rear side, and the front pressing roller 30a is placed on the drawing and conveying conveyor frame 6e side. The rear pressing roller 30a is coaxial with the roller rotation shaft 30f of the front pressing roller 30a. The vertical pressing arm 30b is rotatable about the fixed horizontal frame-side rotating shaft 30c. The roller side rotation arm 30e that rotates up and down around the horizontal roller side rotation shaft 30d provided in the roller is rotatably provided.

  (B) is a pair of pressing rollers 30a, 30a adjacent to each other at the rear, and is connected by a single roller-side rotation arm 30e, and a roller-side rotation shaft at an intermediate portion of the roller-side rotation arm 30e. The pressing rollers 30a and 30a are respectively rotated up and down by a vertical rotation arm 30b rotatably connected to a horizontal frame side rotation shaft 30c fixed to 30d and the pulling and conveying conveyor frame 6e side.

  FIG. 6 shows a state of the film sheet pressing portion 30 in a plan view. The three pressing rollers 30a provided on the left and right sides on the left and right sides of the drawing conveyor conveyer sandwiching portion are the frontmost pressing rollers in this example. The film sheet hole is provided at substantially the same position in the front-rear position as the drawing conveyance conveyor clamping start end 6d, and the two pressing rollers 30a, 30a on the rear side are the drawing conveyance conveyor clamping center side from the frontmost side in the left-right direction. Located on the H side, the arrangement width in the left-right direction is narrow. Accordingly, the film sheet hole H after the rhizome crops are pulled out can be pressed so as to surround the left and right and the rear side of the rhizome crops to be pulled out, so that the film sheet is reliably prevented from being lifted.

  A gauge ring 31 is provided in front of the pulling and conveying conveyor unit 6 to stabilize the height of the foliage pinching, and the height is stabilized while rolling on the upper surface of the ridge G, and the film sheet F is lifted up. The sheet is further pressed at a front position away from the sheet pressing unit 30. The gauge wheel 31 is rotatably provided at one end of the gauge wheel rotating arm 31b, and the other end side is provided on the drawing / conveying conveyor frame 6e so as to be rotatable and fixed up and down so that the vertical position can be adjusted. Moreover, since it exists in the position which can be visually recognized from the cockpit 2, the sinking | falling of a gauge wheel 31 and a lift can be confirmed easily.

  Next, the operation of the rhizome crop harvester, which is one embodiment of the present invention, will be described. The vehicle body 1 that can be driven by the pilot sitting in the cockpit 2 drives the crawler device 1a to run, and the pilot operates the operation device 3 to activate the harvesting device 4. An operator who processes the harvest on the vehicle sits on the seat 5 in the traveling direction. In this embodiment, two left and right seats 5 are provided, and work by two people is possible.

  When the vehicle body 1 is run in the direction of arrow A, the harvesting device 4 is operated, and the gauge ring 31 at the front end is positioned on the upper surface of the basket, the root cutting blade 7 that is provided in the front part of the pulling and conveying conveyor unit 6 and is located in the soil. While swinging back and forth, the soil in the vicinity of the rhizome part U of the rhizome crop C is swelled and softened and the lower part of the hair root part R is cut. The foliage portion L of the rhizome crop C is guided by the foliage guide 13 and is pulled out between the opposing surfaces of the pair of left and right elastic endless belts 6a, 6a of the rotating pulling and conveying conveyor portion 6, and obliquely up and rearward while being pinched It is conveyed to. At this time, since the film sheet F is reliably pressed by the gauge ring 31 and the film sheet pressing part 30, it is not pulled up and caught in the drawing / conveying conveyor part 6.

  The rhizome crop C conveyed obliquely upward and rearward enters between the cutters 8a of the foliage cutting section 8 provided in the reverse direction and is cut into the foliage L and the rhizome U. The cut rhizome part U falls as it is and falls onto the belt conveyor which is the rhizome receiving part 9. The foliage portion L from which the underground stem portion U has been cut is conveyed obliquely upward, caught on the endless rotating chain 11 which is the leaflet 11, and dropped onto the leaflet chute 12 on the downstream side and discharged to the field.

  Since the underground stem U that has fallen on the underground stem receiving portion 9 moves slowly by the movement of the belt conveyor, the underground stem U that successively falls in the same place does not accumulate. The slowly moving rhizome part U is supplied and placed on the bucket 102 of the follicle cutting part 10 by two workers sitting on the seat 5 which is the riding part.

  When each underground stem U reaches the hair root cutting blade 10b by the movement of the chain conveyor 101, the stem S and the valve B are cut by the stem cutter 107, and the space between the hair root R and the valve B is cut by the hair root cutter 106. Is done. The valve B from which the stem S and the hair root portion R have been cut is transported while being placed on the bucket 102 and dropped and stored in a storage container placed on the downstream side.

  Of the underground stem U that has fallen on the underground stem receiving portion 9, the underground stem U that is not taken by the operator during the movement of the belt conveyor is dropped and stored in a storage container placed on the lower downstream side of the belt conveyor. The untreated rhizome part U that has fallen into the storage container may be treated by operating only the hair root treatment part 10 again after the digging operation is completed. The removal process can be performed.

  A sheet cutter 20 positioned on the side of the uncrawler side of the crawler apparatus 1a cuts and separates the film sheet F that has been harvested simultaneously with the harvesting operation from the unharvested side. As a result, it is possible to work while removing the next unstriped strip before working so that the film sheet of the harvested strip is not crushed more than necessary in the vehicle running part, and it is pulled out when harvesting the next strip When passing the root cutting blade 7 extended from the conveyor frame 6e and positioned in the soil, the film sheet can be prevented from being caught and work can be performed efficiently.

  This device may be used in a harvester for a rhizome crop that harvests a rhizome crop such as garlic planted in a field basket covered with a film sheet, while traveling by a traveling vehicle body. The present invention can be used even if the vehicle body 1 that can travel is a walking type harvester that does not have the cockpit 2.

DESCRIPTION OF SYMBOLS 1 Vehicle body which can be traveled 1a Crawler device 2 Pilot's seat 3 Operation device 4 Harvesting device 5 Worker's riding part (seat)
6 Pulling and Conveying Portion 6a Elastic Endless Belt 6b Driving Pulley 6c Driven Pulley 6d Pulling and Conveying Device Nipping Start End 6e Pulling and Conveying Frame 7 Root Cutting Blade 7a Root Cutting Frame 8 Foliage Cutting Section 8a Cutter 9 Underground Stem Receiving Section 10 Hair Root Cutting Section 10a Bulb moving body (endless chain conveyor)
DESCRIPTION OF SYMBOLS 101 Chain conveyor 102 Bucket 10b Hair root stem cutting blade 106 Hair root cutter 107 Stem cutter 11 Leaf body (endless chain conveyor)
12 Leaflet chute 13 Stem and leaf guide 16 Placement plate 20 Sheet cutter 20b Drive motor 30 Film sheet pressing portion 30a Pressing roller 30b Vertical rotating arm 30c Frame side rotating shaft 30d Roller side rotating shaft 30e Roller side rotating arm 30f Roller Rotating shaft 30g Spring 31 Gauge ring 31b Gauge ring rotating arm 321 First pressing roller 322 Second pressing roller 323 Third pressing roller C Underground crop U Underground stem R Hair root B Valve S Stem L Stem leaf F Film sheet G 畝 H Film Sheet hole

Claims (4)

In the harvesting device for rhizome crops planted in a field covered with film sheets, the harvesting device sandwiches the foliage of the harvested crops by a pair of left and right belt conveyors diagonally laid from the front to the rear. It includes a drawing conveyance conveyor section to be extracted, and a film sheet pressing roller provided on the left and right of the drawing conveyance conveyor clamping start end,
The film sheet pressing rollers are arranged substantially symmetrically on the left and right sides of the pulling and conveying conveyor sandwiching center, and are provided with a plurality of pressing rollers on the left and right sides, respectively. A rhizome crop harvester characterized in that it is rotatably provided on the pivot end side of one vertical pivot arm that pivots up and down around a horizontal frame-side pivot fixed to the side. . In the harvesting device for rhizome crops planted in a field covered with film sheets, the harvesting device sandwiches the foliage of the harvested crops by a pair of left and right belt conveyors diagonally laid from the front to the rear. It includes a drawing conveyance conveyor section to be extracted, and a film sheet pressing roller provided on the left and right of the drawing conveyance conveyor clamping start end,
The film sheet pressing rollers are arranged substantially symmetrically on the left and right sides of the pulling conveyer sandwiching center, and are provided with a plurality of pressing rollers on the left and right sides, respectively. It is provided rotatably on a vertical rotation arm that rotates up and down around a horizontal frame side rotation axis fixed to the frame side of the pulling conveyor, and the rear side pressing roller is provided on the front side pressing roller side. A rhizome crop harvesting machine, which is rotatably provided on a roller-side vertical rotation arm that rotates up and down around a horizontal roller-side rotation axis. In the harvesting device for rhizome crops planted in a field covered with film sheets, the harvesting device sandwiches the foliage of the harvested crops by a pair of left and right belt conveyors diagonally laid from the front to the rear. It includes a drawing conveyance conveyor section to be extracted, and a film sheet pressing roller provided on the left and right of the drawing conveyance conveyor clamping start end,
The film sheet pressing rollers are disposed substantially symmetrically on the left and right sides of the drawing and conveying conveyor sandwiching center, and are positioned behind the first holding roller and the drawing and conveying conveyor holding start end near the drawing and conveying conveyor holding start end. It has a second pressure roller and a third pressure roller located behind the second pressure roller, and the first pressure roller and the second pressure roller rotate horizontally on the frame side fixed to the frame side of the pulling conveyor. The third pressing roller is rotatably provided on a vertical rotating arm that rotates up and down around an axis, and the third pressing roller rotates up and down around a horizontal roller-side rotating shaft provided on the second pressing roller side. A rhizome crop harvester characterized in that it is rotatably provided on a side vertical pivot arm.   The lateral arrangement width of the pressing rollers located on the left and right sides of the pulling conveyer clamping center is narrower than the lateral arrangement width of the pressing rollers located near the pulling conveyer clamping start end. The rhizome crop harvester according to any one of claims 1 to 3.