JP3105184B2 - Rhizome harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rhizome harvester for extracting and harvesting onions, carrots and the like planted in rows on a ridge.

[0002]

2. Description of the Related Art There is a rhizome harvester which operates so that onions vegetated on a ridge surface are pulled out during running, and the middle of the foliage is cut off by a cutting device driven by an engine. In this type of harvester, the cutting device is fixed at the optimum height position of the body frame, so that the foliage of the onion is always cut off from the ball at a fixed length position.

[0003]

However, depending on the treatment of the onion after harvesting, there is a case where it is desired to change the cutting length of the foliage to a longer or shorter length. In order to meet this demand, the present applicant has devised a prior art in which the height position of the cutting device can be changed and adjusted, and the rotation of the engine is transmitted to the cutting device via a flexible shaft.

However, in this prior art, the joint between the flexible shaft and the rotary input shaft of the cutting device is susceptible to fatigue failure due to the discontinuity of torsional rigidity. May be destroyed at once by receiving a shocking load from being hit. An object of the present invention is to provide a rhizome harvester capable of addressing the above problems.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows. Change the fixed height position of the cutting device in the rhizome harvester, which pulls up the rhizome crops vegetated on the ridge surface while running and cuts the length of the foliage with a cutting device driven by an engine Adjustable, and engine rotation,
The power is transmitted to the cutting device via a rigid transmission system including gears and rigid shafts.

Here, the rigid transmission system refers to a mechanical transmission system having transmission members such as a rotating shaft, gears, sprockets, and chains that are sufficiently rigid compared to a flexible shaft. When the cutting device is set at a higher fixed position, the onion is cut off at a higher position of the foliage,
Conversely, if the fixed position is set low, the low position of the foliage is cut off.

In addition, the rigid power transmission system can make the power transmission strength higher than that of the conventional flexible shaft, and is less likely to be broken by fatigue or impact load. The specific configuration of the rigid transmission system is as follows, for example. A rhizome harvester that operates to pull out a rhizome crop vegetated on a ridge surface during traveling and cut off the middle of the length of the foliage with a cutting device driven by an engine, and a fixed height position of the cutting device. And the rotation of the engine is transmitted to the cutting device via a rigid transmission system including gears and rigid shafts, and the rigid transmission system
A fixed drive case 257 for transmitting the rotation of the engine to a specific position .
When the transmission case 288 is provided so as to be swingable along the vertical surface,
A second transmission case 289 is provided on the front side of the first transmission case 288 so as to be swingable along a vertical surface, and a laterally rigid transmission cylinder is fixed to the front side surface of the second transmission case 289,
In the configuration in which the distal end of the lateral rigid transmission cylinder is used as a mounting point of the cutting device, the center of swing of the first transmission case 288 relative to the drive case 257 is matched with the drive shaft 258, and the first transmission case 288 Drive shaft 2
A first sprocket 291 is fixed to a portion 58, and a sprocket shaft 292 is provided at a swing center of the second transmission case 289 with respect to the first transmission case 288.
The second sprocket 293 and the third sprocket 294 are fixed to the sprocket shaft 292 located inside the second transmission case 289 and inside the second transmission case 289. Is provided with a rigid transmission shaft 295, a fourth sprocket 296 is fixed inside the second transmission case 289 on the rigid transmission shaft 295, and the first sprocket 291 and the second sprocket 2
The endless first chain 297 and the second chain 298 are wound around the space between the shaft 93 and the third sprocket 294 and the space between the third sprocket 296 and the rigid transmission shaft 295.
Is connected to the rotary input shaft of the cutting device 14,
A guide plate 147 that allows the cutting device 14 to be fixed to the body and the height of the cutting device 14 to be freely adjusted can be adjusted at a position near the cutting device 14 at the inner end of the rigid transmission shaft 295.

[0008] With this configuration, also in this modification, when changing the cutting position of the foliage w1, the height of the cutting device 14 can be changed in the same manner as described above. In this case, the first transmission case 288 and the second transmission case 289 bend around the sprocket shaft 292, thereby enabling the cutting device 14 to be displaced.
The rotation transmission from 5 to the cutting device 14 is reliably performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. 1 is a plan view of the harvester according to the present invention, FIG. 2 is a side view operation explanatory view of the harvester, FIG. 3 is a power transmission system explanatory view of the harvester, FIG. 4 is a front view of the harvester, FIG. 5 is a right side view of the harvester, FIG. 6 is a plan view showing a part of the harvester, FIG. 7 is a sectional view showing a main part of the harvester, and FIG. 8 is a side view showing a main part of the harvester. FIG. 9 and FIG. 9 are rear views showing a part of the harvester, and FIG. 10 is an explanatory sectional view showing an operation of a part of the harvester.

In FIG. 1, reference numeral 1 denotes a vertically-rotating weed raising device provided at the forefront of the body at predetermined intervals in the left-right direction. In the raising device 1, the foliage w1 of a crop w such as an onion or the like is swept and caused by the locking projection 1a which is moved obliquely upward f1 shown in FIG.

A weed stick 2 extends obliquely forward and downward from the tip of each weed raising device 1. This weeding stick 2 is for scraping the foliage w1 of the crop w while the body is in progress.

Numeral 3 denotes a raking device composed of a pair of left and right raking main portions 4, 4 which orbits the locking projections 4a of each raking main portion 4 from the outside of the distal end portion of the raking device 3 toward a central portion. By moving it and then moving diagonally upward, the foliage w1 caused by the raising device 1 is scraped into the lower center of the raking device 3 and pushed up to the diagonally upward f2 shown in FIG.

Reference numeral 5 denotes a drawing and conveying device comprising a pair of right and left drawing and conveying main parts 6. The main part 6 of each pull-out conveyance is shown in FIG.
And a plurality of pulleys 6a and 6b shown in FIG. The transport belts 7.7 of these main parts 6.6 are opposed to each other, and a space between the belts 7.7 forms a pull-out transport path k.

The pulling and conveying device 5 draws a relatively upper portion of the foliage w1 scraped by the raking device 3 into a pulling and conveying path k.
, And then the pull-out conveyor belt 7.7
And transported to an obliquely upper side f3 shown in FIG. 2, and in this transporting process, the excavating blade 8 positioned below as shown in FIG.
-The crop w of the ridge surface U excavated in 8 is pulled out from the soil.

Below the pull-out conveyor belts 7, a lower conveyor 9 is provided as shown in FIG. As shown in FIG. 6, the lower transfer device 9 includes a pair of right and left lower transfer main portions 10.
10; the front-rear inclination of this is made gentler than that of the drawing and conveying device 5. Each lower transport main part 10 is formed by wrapping a lower transport belt 13 around a pair of front and rear end pulleys 11 and 12. At this time, the pair of lower conveyor belts 13
The area between 3 and 13 is defined as a nipping transport path k1 below the foliage w1.

As shown in FIG. 2 and the like, a cutting device 14 is provided between the pull-out conveying device 5 and the lower conveying device 9, and this cutting device 14 is moved from the horizontal portion 141a and the vertical portion 141b as shown in FIG. A rotary input shaft 142 provided inside the horizontal portion 141a, and an output shaft 144 interlocked and connected to the rotary input shaft 142 and the bevel gear 143 provided on the vertical portion 141b. A disk-shaped rotary cutting blade 145 is fixed to the output shaft 144.

The cutting device 14 is mounted on the body so that the fixed height position can be changed and adjusted, and is specifically formed as follows. That is, as shown in FIGS. 7 and 8, a guide plate 147 having a U-shaped cross section is fixed to a support plate 146 provided on the same body as the body by bolts, and a vertical surface portion which is a central side of the guide plate 147 is provided. An elongated hole s is formed in 147a, while a flange portion t is formed in a horizontal portion 141a of the cutting device 14, and a nut body 148 with an operation handle 148a is screwed into a portion near the flange portion t. There is. And the flange portion t is located on the opposite side portion 147b of the guide plate 147.
The cutting device is fitted between the 147b and the horizontal portion 141a and inserted into the elongated hole s, and the guide plate 147 is narrowed by the nut body 148 and the flange portion t by the fastening operation of the nut body 148. 14 is formed so as to be fixed.

An alignment device 15 shown in FIGS. 2 and 6 and the like is provided below the pull-out transport device 5 and at a position subsequent to the lower transport device 9 (FIG. 2). The main part of the aligning device 15 is rotatable in a state where the pair of second pulleys 16 and 17 are substantially along the vertical surface at the front and rear elevations or the lower part of the pulleys 16 and 17 is inclined to the left side. And an endless transport belt 18 is attached to the pulleys 16 and 17.
To transmit the rotation to the front second pulley 16 via an appropriate transmission case, and to lower the lower belt 1 of the conveyor belt 18.
8a is formed so as to be driven rearward and downward f4.

Between the aligning device 15 and the lower transport device 9, there is provided a side-by-side transfer device Y as shown in FIGS. The side-to-side transfer device Y includes a rotation center shaft 2 integrated with a pulley 12 on the rear left side of the lower transfer device 9.
0, a guide roller 22 is provided below the pulley 12 on the rear left side of the lower conveying device 9 so as to freely rotate around a rotation center axis 20.

The two guide rods 23a and 23b forming a part of the aligning device 15 are arranged in relation to the transport path k1 of the lower transport device 9, and are opposed to the lower side of the transport belt 18 in the left-right direction. More specifically, more specifically, the front end is fixed to a position near the lower surface of the lower transfer device 9 in front of the pulley 12 on the rear left side of the lower transfer device 9,
As it goes backward, it is gradually raised to pass between the lower transport device 9 and the guide roller 22 and close to the lower transport path k1, and further obliquely backward along the lower tension portion 18a of the transport belt 18 at the rear. Along with one guide rod 23b toward the rear end thereof.
It shall be gradually moved from 8 to the side.

Thus, the aligning device 15 is provided with a guide plate 24 as a posture changing means for raising the root-side weight part w2 of the foliage w1 of the crop w to ease the bending of the foliage w1. It is. This guide plate 24
Is fixed to only one of the guide rods 23b and exists over substantially the entire range from the guide start point to the guide end point.

1 and 5, reference numeral 25 denotes an engine,
26 and 26 are wheels mounted on the fuselage, 27 is a bearing supporting a drive shaft 28 for transmitting the rotation of the engine 25 to the pull-out and transport device 5, and 29 is for holding the front part of the fuselage at an appropriate height. , 30 is a rotary operation handle for vertically displacing the gage wheel 29 with respect to the fuselage, 31 is a steering handle, and 32 is capable of being transported from the inside of the upper end of the left pull-out and transporting main part 6 to the outside in the arc direction. Foliage discharge device, 3
Reference numeral 3 denotes a connecting rod which is moved back and forth through a crank 33a to be described later and vibrates the excavating blade 8 around the fulcrum 34.

The power transmission system of the engine 25 is configured as follows. That is, as shown in FIG. 3, the rotation of the engine 25 is transmitted to the transmission case 2 via the rigid transmission member.
51, and then transmitted to the traveling wheels 26 via a transmission case 252 and a final case 253 which extend right and left from the transmission case 251.

A transmission case 254 in the front-rear direction is provided at the front of the transmission case 251, and a work output shaft 255 in the transmission case 254 is connected to a rigid transmission system in the transmission case 251 via a work clutch 256.
A horizontal drive case 257 is connected to the transmission case 254, and is linked to a horizontal drive shaft 258 in the drive case 257 via a bevel gear 259.

A crank 33a is formed at each of the left and right ends of the lateral drive shaft 258. A worm 260 is formed at the center of the lateral drive shaft 258, and the lateral drive shaft 258 and the pull-out transport drive shaft 262 are interlocked via a worm wheel 261 meshed with the worm 260.

The drive shaft 262 is connected to each of the main parts 6 of the pull-out conveyance.
6 (FIG. 1) is coupled to a pulley 6a via a chain transmission mechanism and the like.
Center shaft 26 of front pulley 6b transmitted through
3, the pulling device 3 and the pulley 6b on the front side of the lower conveying device 9 are interlockingly connected.

A forward drive cylinder 264 extends from the right end of the lateral drive case 257, and the forward drive shaft 265 and the lateral drive shaft 258 in the drive cylinder 264 are connected to the bevel gear 2.
66 and a forward drive shaft 265 and an upper sprocket shaft 2 for rotating the raising device 1
67 are connected via a bevel gear 268.

A transmission case 269 for a cutting device is fixedly provided at the rightmost end of the lateral drive case 257, and the inner side surface of the front end of the transmission case 269 and the cutting device 14 are connected by a transmission cylinder 270. Transmission case 269 and transmission cylinder 2
The transverse drive shaft 258 and the rotation input shaft 142 of the cutting device 14 are interlocked and connected via a transmission member in 70.

The transmission structure in the transmission case 269 is as follows. That is, as shown in FIGS. 3 and 7, a lateral drive shaft 258 is attached to the rear end of the transmission case 269.
And a sprocket shaft 271 connected via a bevel gear 266a, while a sprocket shaft 272 is provided at the front end of the transmission case 269. Each sprocket shaft 2
An endless chain 275 is hung between sprockets 273 and 274 fixed to 71 and 272, and this chain 2
The guide wheel 2 provided in the transmission case 269
The chain 275 is tensioned via a spring plate 277 shown in FIG. 5 attached to the transmission case 269.

The transmission structure in the transmission cylinder 270 is as follows. That is, as shown in FIG. 7, a universal joint 279 is attached to each of the rotation shaft 278 inserted into the center hole of the sprocket shaft 272 and the rotation input shaft 142 of the cutting device 14.
280. One end of 280 is connected to this universal joint 279.
The other end of 280 is connected by a rigid transmission shaft 281. At this time, the rigid transmission shaft 281 can be expanded and contracted by a spline fitting 282 or the like.

A torque limiter 283 is interposed between the sprocket shaft 272 and the rotation shaft 278. The torque limiter 283 includes a disk portion 284 formed integrally with the sprocket shaft 272, and a sliding contact rotating body 285 fixed to the rotating shaft 278. The sliding contact rotating body 285 is provided with a hole h in the direction of the rotating shaft 278. , With a compression spring m and a ball m1
And a plurality of recesses at which the ball m1 engages are provided at the same radial position on the sliding contact surface of the disk body 284.

The rigid transmission shaft 281 is connected to the rigid pipe 286.
And each end of the rigid tube 286 and the transmission case 26
9 and the body frame 141 of the cutting device 14 are connected by a flexible tube 287.

Next, the operation when the crop (onion) w is harvested by the harvester configured as described above will be described. 1 and 2
When the machine is run along the ridge surface U as shown in FIG. 4, the excavating blade 8.8 digs the ridge surface U at an appropriate depth, and the pulling and conveying device 5 moves the relatively upper portion of the foliage w1. , The onion w is pulled out, and is conveyed to the rear obliquely upward f3.

The onion w conveyed in this manner is supplied below the foliage w1 to the conveying start end of the lower conveying device 9, and thereafter, the lower conveying belts 13, 13 sandwich the lower part of the foliage w1 and are directed substantially horizontally. To the rear of

During the transfer by the pull-out transfer device 5 and the lower transfer device 9, the pull-out transfer device 5 pulls the foliage w1 upward, while the lower transfer device 9 is moved by the lower transfer belt 13
The ball portion w2, which is the weight portion on the root side, is locked via 13 to prevent the ball portion from rising. Therefore, the lower conveyor belts 13
Is moved backward while pinching the neck of the foliage w1, and the pull-out transport device 5 applies a pulling force to the foliage w1 located between the lower transport device 9 and makes it tense.

In this manner, the foliage w
1 advances, the cutting blade 145 of the cutting device 14 rotates and cuts the foliage w1 at a fixed height in the course of the conveyance, and the onion w thus processed is eventually turned over. Reach

Before reaching the transfer end point of the lower transfer device 9, the foliage w 1 having reached the transfer device Y is moved to the lower end of the lower transfer belt 13 or the front ends of the guide rods 23 a and 23 b shown in FIG. Is conveyed rearward while being pinched by the conveying belt 18, and in this conveying process, the foliage w1 is engaged and conveyed by the star wheel 21, and the ball w2 is guided by the guide roller 22 (FIG. 9). It will be. At this time, the foliage w1 is moved leftward and rearward along the arc of the outer periphery of the star wheel 21, while the ball w2 is smoothly moved rearward in contact with the peripheral surface of the guide roller 22, so that the onion w is The posture is definitely lying down.

The foliage w1 that has been laid down in this way is moved by the conveying belt 18 and the guide rods 23a.
3b, the conveyor belt 18 is moved to the foliage w1.
As shown in FIG. 10, the ball portion w2 is conveyed obliquely downward and rearward while being pressed from above onto the guide rods 23a and 23b. During this conveyance, the ball portion w2 is suspended by the foliage w1. Below, the end is guided by the guide plate 24 and is gradually pushed to the right side to be gradually raised.

When the ball portion w2 reaches the end of conveyance of the aligning device 15, the bend of the neck portion is relaxed even if the falling posture of the foliage portion w1 does not change, and the onion w is in the overall sideways posture. Then, it is opened in this posture and falls on the ridge surface U.

Such an operation is performed continuously for each onion w which is pulled out while the machine is in progress, and the harvested onion w is in a constant sideways posture on the ridge surface U of the running trace of the machine. Are aligned. The tip of the foliage w1 separated by the cutting device 14 is further transported upward by the pull-out transporting device 5, then transported laterally by the foliage discharging device 32, and dropped to the side of the machine body.

An example of the use of the cutting device 14 and the operation at that time will be described with reference to FIGS. 3, 7, and 8. FIG. Foliage w
When the operator wants to change the cut-off position of the nut 1 upward, the operator grips the nut body 148 by holding the operation handle 148a, displaces the main body frame 141 upward, and performs the fastening operation of the nut body 148 again.

At this time, since the rigid transmission shaft 281 is extended and the universal joints 279 and 280 and the flexible tube 287 are appropriately bent, the above operation is performed without any trouble. It is transmitted smoothly. Therefore, the cutting blade 145 rotates smoothly at a high position, and cuts off the position near the tip of the foliage w1.

On the other hand, when it is desired to change the cutting position of the foliage w1 downward, the nut body 148 is operated in the same manner to displace the main body frame 141 downward, whereby the cutting blade 145 is smoothly moved at a low position. Rotate, foliage w
1 is separated from the base position. If an excessive load acts on the cutting blade 145 during such cutting, the sliding contact rotating body 285 relatively rotates against the disk body 284 by overcoming the locking force due to the engagement of the ball m1 into the recess, The cutting blade 145 does not receive a torque larger than the rotation transmitting force related to the locking force.

A modification of the above embodiment will be described. FIG. 11 is a side view showing a harvester according to this modification, and FIG. 12 is an explanatory view showing a main part of the harvester. A first transmission case 288 is provided on a drive case 257, which is a fixed transmission case, so as to be swingable along a vertical surface.
A second transmission case 289 is provided at the front side of the head 88 so as to be swingable along a vertical surface. A lateral rigid transmission tube 290 is fixed to the front side of the second transmission case 289, and the distal end of the lateral rigid transmission tube 290 is connected to the cutting device 14 so as to be rotatable.

Drive case 257 of first transmission case 288
The center of swing with respect to the drive shaft 258 is matched with the drive shaft 258, and the first sprocket 291 is fixed to the drive shaft 258 located inside the first transmission case 288.

The center of swing of the second transmission case 289 with respect to the first transmission case 288 is located at the sprocket shaft 292.
And the first transmission case 288 and the second transmission case 28
A second sprocket 293 and a third sprocket 294 are fixed to a portion of the sprocket shaft 292 located inside the sprocket 9. At the front end of the second transmission case 289, the transmission cylinder 290
A rigid transmission shaft 295 is provided inside the position where is located. The portion of the transmission shaft 295 in the second transmission case 289 and the fourth sprocket 296 are connected via a torque limiter 283 similar to the previous one. Are combined.

Then, between the first sprocket 291 and the second sprocket 293, and between the third sprocket 294 and the fourth sprocket 293.
An endless first chain 297 and a second chain 298 are wound around each of the sprockets 296, and the inner end of the transmission shaft 295 is connected to the rotation input shaft of the cutting device 14. Other parts are the same as the above.

Also in this modification, when changing the cutting position of the foliage w1, the height of the cutting device 14 is changed in the same manner as described above. In this case, since the first transmission case 288 and the second transmission case 289 bend around the sprocket shaft 292, the cutting device 14 can be displaced, and the rotation transmission from the engine 25 to the cutting device 14 is reliably performed. is there.

[0049]

As described above, the present invention has the following advantages. A rhizome harvester as claimed in claim 1, wherein the rhizome crop vegetated on the ridge surface is pulled out during running, and the middle of the length of the foliage is cut off by a cutting device driven by an engine. The fixed height position of the device can be changed and adjusted, and the rotation of the engine is transmitted to the cutting device via a rigid transmission system including gears and rigid shafts, and the rigid transmission system controls the rotation of the engine to a specific position. Drive case 257 for transmitting to the
And the first transmission case 288 is attached to the drive case 257.
With swingably provided along the longitudinal sides, the front side of the first transmission case 288 swingable along a second transmission case 289 in a vertical plane, and, front portion side of the second transmission case 289 In the configuration in which the laterally rigid transmission cylinder is fixed to the end and the distal end of the laterally rigid transmission cylinder is used as a mounting point of the cutting device, the swing center of the first transmission case 288 with respect to the drive case 257 is matched with the drive shaft 258. The first sprocket 291 is fixed to a portion of the drive shaft 258 located inside the first transmission case 288, and a sprocket shaft 292 is provided at a swing center of the second transmission case 289 with respect to the first transmission case 288. A second sprocket 293 and a third sprocket 294 are attached to the sprocket shaft 292 located inside the first transmission case 288 and the second transmission case 289.
Is fixed, and the transmission cylinder 290 is fixed at the tip of the second transmission case 289.
A rigid transmission shaft 295 is provided inside the position where is located. The fourth sprocket 296 is fixed inside the second transmission case 289 on the rigid transmission shaft 295, and the first sprocket 291 and the second sprocket 295 are fixed. Between the sprocket 293 and the third
An endless first chain 297 and an endless second chain 298 are provided between the sprocket 294 and the fourth sprocket 296, respectively.
And by connecting the inner end of the rigid transmission shaft 295 to the rotary input shaft of the cutting device 14, the height of the cutting device 14 can be changed when the cutting position of the foliage w1 is changed. In this case, the first transmission case 288 and the second transmission case 289 bend around the sprocket shaft 292, thereby enabling the cutting device 14 to be displaced, and the rotation transmission from the engine 25 to the cutting device 14 is ensured. It is done.

[Brief description of the drawings]

FIG. 1 is a plan view of a harvester according to the present invention.

FIG. 2 is a side view operation explanatory view of the harvester.

FIG. 3 is an explanatory diagram of a power transmission system of the harvester.

FIG. 4 is a front view of the harvester.

FIG. 5 is a right side view of the harvester.

FIG. 6 is a plan view showing a part of the harvester.

FIG. 7 is a sectional view showing a main part of the harvester.

FIG. 8 is a side view showing a main part of the harvester.

FIG. 9 is a rear view showing a part of the harvester.

FIG. 10 is an explanatory sectional view showing an operation of a part of the harvester.

FIG. 11 is a side view showing a harvester according to a modification of the embodiment.

FIG. 12 is an explanatory diagram showing a main part of the harvester.

[Explanation of symbols]

 U Ridge surface w Crop (onion) w1 Forage 14 Cutting device 25 Engine 142 Rotary input shaft 258 Drive shaft 257 Transmission case 269, 288, 289 Rigid transmission system 279, 280 Universal joint 286 Rigid tube 287 Flexible tube 288 First transmission Case 289 second transmission case 290 sideways transmission tube

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Watanabe 428 Enami, Onami, Okayama City, Okayama Prefecture (56) References JP-A-7-79757 (JP, A) JP-A-6-276825 (JP, A) Japanese Patent Application Laid-Open No. 11-42008 (JP, A) Jikken 43-17633 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 13/00-34 / 86

Claims (1)

(57) [Claims] 1. A rhizome harvesting machine that operates to pull out a rhizome crop vegetated on a ridge surface during traveling and cut off the middle of the length of the foliage with a cutting device driven by an engine. The fixed height position of can be changed and adjusted, and the rotation of the engine is transmitted to the cutting device via a rigid transmission system including gears and rigid shafts, and the rigid transmission system is
A fixed drive case 257 for transmitting the rotation of the engine to a specific position .
When the transmission case 288 is provided so as to be swingable along the vertical surface,
In addition, a second transmission case 289 is provided on the front side of the first transmission case 288 so as to be swingable along a vertical surface, and a laterally rigid transmission cylinder is fixed to the front side surface of the second transmission case 289,
In the configuration in which the distal end of the lateral rigid transmission cylinder is used as a mounting point of the cutting device, the center of swing of the first transmission case 288 relative to the drive case 257 is matched with the drive shaft 258, and the first transmission case 288 Drive shaft 2
A first sprocket 291 is fixed to a portion 58, and a sprocket shaft 292 is provided at a swing center of the second transmission case 289 with respect to the first transmission case 288.
The second sprocket 293 and the third sprocket 294 are fixed to the sprocket shaft 292 located inside the second transmission case 289 and inside the second transmission case 289. Is provided with a rigid transmission shaft 295, a fourth sprocket 296 is fixed inside the second transmission case 289 on the rigid transmission shaft 295, and the first sprocket 291 and the second sprocket 2
The endless first chain 297 and the second chain 298 are wound around the space between the shaft 93 and the third sprocket 294 and the space between the third sprocket 296 and the rigid transmission shaft 295.
Is connected to the rotary input shaft of the cutting device 14,
A rhizome harvesting, wherein a guide plate 147 for fixing the cutting device 14 to the fuselage and changing the height of the cutting device 14 freely is provided at a position near the cutting device 14 at the inner end of the rigid transmission shaft 295. Machine.