JP5868532B2 - Paddy field machine - Google Patents

Description

The present invention relates to water fields working machine.

  Conventionally, as shown in Patent Document 1, for example, a seedling planting apparatus having a plurality of planting arms arranged in the horizontal direction of the machine body, and a groove cutting body provided in the center of the seedling planting apparatus in the horizontal direction of the machine body are provided. There was a rice transplanter.

JP 2004-33076 A

  When the grooved bodies are arranged on both the left and right sides of the machine body, if the left and right grooved bodies are subjected to ground reaction forces with different strengths, the machine body is likely to be inclined or twisted. A support structure that supports the grooving body to the aircraft when deploying the grooving body at the center in the left-right direction of the aircraft so that the machine does not easily tilt or twist due to the ground reaction force that the grooving body receives. When the support structure has a special shape due to avoiding interference with the structure of the aircraft and the device portion, the left and right weights of the aircraft are difficult to balance due to the support structure.

  The objective of this invention is providing the paddy field machine which can arrange | position a grooved body in the horizontal center part of a body, making it easy to balance the left-right weight of a body.

The first invention is
A plurality of working units arranged in the lateral direction of the aircraft, a grounding float disposed on the lower side of the working unit, and a transmission case facing in the longitudinal direction of the aircraft are provided at the rear of the aircraft,
The driving force of the driving case is configured to be transmitted from the transmission case on the right side of the aircraft to the working portion on the right side of the aircraft, and the driving force of the driving case is transmitted from the transmission case on the left side of the aircraft to the working portion on the left side of the aircraft. Configured as
Aircraft lateral support rods connected across the transmission cases on the right and left sides of the aircraft,
A grooving body for forming a drainage groove in a farm scene is arranged at the center of the machine body in the lateral direction on the rear side of the machine body of the grounding float and supported by the support rod.

According to the configuration of the first aspect of the invention, since the support rod is connected over the transmission case on the right side and the left side of the aircraft , the shape of the support rod is made symmetrical, and the connection between the support rod and the support rod and the grooved body is connected. The grooving body can be disposed in the center in the lateral direction of the aircraft while avoiding or suppressing the balance of the left and right weights of the aircraft due to the structure.
The support rod is because those connecting the transmission cases of aircraft right and airframe left, it is possible to equip the supporting rod reinforcement features such as suppressing Re vibration of the transmission case.

Therefore, according to the first aspect of the present invention, not only can the grooving body be arranged in the center in the lateral direction of the airframe to prevent the machine body from tilting or twisting due to the ground reaction force received by the grooving body, but also the grooving body. It is easy to balance the left and right weight of the aircraft regardless of the addition of support rods etc. that support the aircraft, and as a whole, the drainage grooves are formed at the same time as the work by the work unit, while the ground height of the left and right work units is Easy to align.
Further, the machine body frame including the drive case and the transmission case can be provided with excellent strength with a simple structure utilizing the support rod as a reinforcing means.

This second invention
Deploying the working part behind the rear wheel,
The working unit adjacent to the rear of the rear wheel is set as a work target location on both lateral sides of the rear wheel passage trace of the farm scene, and the working unit on the lateral side outside the adjacent working unit. The rear wheel is arranged so that the position closer to the rear wheel passing trace than the working portion on the inner side of the fuselage is the work target position.

When the drainage groove is formed by the grooved body in the passage of the rear wheel, it is avoided that the soil that has been hardened or raised by the passage of the rear wheel moves to the work symmetrical place by pushing the laterally outward by the grooved body. In order to facilitate, the work target location on the inner side of the machine body and the work target site on the outer side of the machine body are located at the same distance from the trace of the rear wheel. As such, it is necessary to deploy the rear wheels.
According to the configuration of the second aspect of the invention, the grooved body is disposed in the center in the lateral direction of the machine body, and the grooved body forms a drainage groove at a location where it has deviated from the passage mark of the rear wheel. Since the rear wheel is deployed so that the target location is located closer to the trace of the rear wheel than the work target location inside the fuselage, the work target location on the lateral side of the fuselage and the inner side of the fuselage are compared with deploying the rear wheel so as to be positioned away the same distance, wear likewise avoided ease Kude that soil passing track of the rear wheels are moved pushed working position.

Therefore, according to the second invention, the soil of the rear wheels pass traces Ru can form drains in the state have not easily move to the working target portion.

  In the third aspect of the present invention, the grooving body is arranged so that the rear end of the grooving body is located at substantially the same position or in front of the rear end of each working section.

  According to the configuration of the third aspect of the invention, for example, when turning the aircraft, if the work part positioned at a higher arrangement height than the grooved body is easily looked out and care is taken so that the work part does not hit the shore, Since the rear end of the grooving body is located at substantially the same position or in front of the rear end of each working part, the grooving body is located at the lower part in addition to being located at the center in the lateral direction of the machine body. Even if it is difficult to see, it can be prevented from hitting the edge of the grooved body.

  Therefore, according to the third aspect of the present invention, the grooving body is arranged in the center in the lateral direction of the machine body, and deformation and breakage due to collision with the shore of the grooving body can be easily prevented.

  According to the fourth aspect of the present invention, a work height adjusting unit for changing the ground work height of the grooved body is provided.

  According to the configuration of the fourth aspect of the invention, by changing the ground work height of the grooved body by the work height adjusting unit, the grounding resistance received by the grooved body and the depth of the drainage groove formed by the grooved body are reduced. Can be adjusted.

  Therefore, according to the fourth aspect of the present invention, for example, even in a field where the mud soil has a different hardness and water volume, the ground resistance received by the grooving body and the depth of the drainage groove formed by the grooving body can be adjusted to run smoothly. You can work while.

  According to the fifth aspect of the present invention, a spring is provided that supports the grooving body so that the grooving body can swing up and down and provides resistance to the rise of the grooving body due to a ground reaction force.

  According to the fifth aspect of the present invention, when the grooving body is pressed against the field against the ground reaction force by the spring and a strong ground reaction force is applied to the grooving body by a lump or the like, the grooving body is brought into contact with the ground reaction force. The drainage groove can be formed by the grooved body while being raised by the above.

  Therefore, according to the fifth aspect of the present invention, even if the grooved body hits a clot or the like, it rises and hardly deforms or breaks, and it is easy to work even when there is a clot or a hard field.

It is a side view which shows the whole paddy field machine. It is a top view which shows the whole paddy field machine. It is a side view which shows a paddy field working apparatus. It is a rear view which shows a paddy field working apparatus. It is a rear view which shows the working part for fertilization of a paddy field working apparatus. It is a cross-sectional top view which shows a paddy field working apparatus. It is a top view which shows the lower part of a paddy field working apparatus. (A) is a side view showing a grooving body in a state set to a low ground working height, (b) is a side view showing a grooving body pressed against mud, and (c) is a high ground working height. It is a side view which shows the groove cutting body in the state set to (2). It is a perspective view which shows the support structure of a grooved body. It is a side view which shows the paddy field working apparatus in the state which connected the chemical spreader.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an entire paddy field working machine according to an embodiment of the present invention. FIG. 2 is a plan view showing the entire paddy field working machine according to the embodiment of the present invention. As shown in these drawings, a paddy field working machine according to an embodiment of the present invention includes a pair of left and right front wheels 1 and 1 that can be steered and a pair of left and right rear wheels 2 and 2 that can be freely driven, and a front part of a vehicle body. And a driving part having a driving seat 4 provided at the rear part of the vehicle body. The front wheel 1 and the rear wheel 2 are driven by the driving force from the engine 15 provided in the driving part 3 to A paddy field work apparatus A that includes a self-propelled vehicle that is configured to run and that is configured to ride and operate on a driving unit, and that is connected to the rear portion of the body frame 6 of the self-propelled vehicle via a link mechanism 5. It is prepared.

  In the paddy field work apparatus A, the link mechanism 5 is swung up and down with respect to the vehicle body frame 6 by the hydraulic cylinder 20, so that the grounding float 12 is in contact with the field mud and the grounding float 12 is in the field mud. It is configured to be moved up and down to a lifted non-working state that has been lifted high. The paddy field work machine performs 4 seeding work and 4 fertilization work by the paddy field work apparatus A by lowering the paddy field work apparatus A to the lowered work state and running the self-propelled vehicle.

A self-propelled vehicle will be described.
The pair of left and right rear wheels 2, 2 provided in the self-propelled vehicle are arranged as shown in FIG.
That is, it is located adjacent to the rear of the left rear wheel 2 (hereinafter referred to as the left rear wheel 2) among the four sowing work units 9 provided side by side in the machine body lateral direction on the paddy field work apparatus A. A pair of working parts 9, 9 sowing the left side wheel 2 passing trace 2a (referred to as the left rear wheel passing trace 2a) as work target points Pa, Pb, and so on. A pair of working parts 9 and 9 located behind the right rear wheel 2 (hereinafter referred to as the right rear wheel 2) of the two seeding working parts 9 are passed traces 2a (hereinafter referred to as the right rear wheel 2). And a pair of working parts 9 and 9 positioned further behind the right and left rear wheels 2 so as to perform seeding work with both lateral side portions of the right rear wheel passing trace 2a) as work target portions Pa and Pb. The work target location Pa of the work unit 9 outside the machine body is the work target location P of the work unit 9 inside the machine body. So as to be located near the more right and the left rear wheel passing marks 2a, are deployed right and left rear wheels 2,2.

The paddy field working apparatus A will be described.
FIG. 3 is a side view showing the paddy field working apparatus A. FIG. FIG. 4 is a rear view showing the paddy field working apparatus A. FIG. 5 is a rear view showing the working unit 10 for fertilization of the paddy field working apparatus A. FIG. 6 is a cross-sectional plan view showing the paddy field working apparatus A. As shown in these drawings and FIG. 2, the paddy field work apparatus A includes a machine body frame F having a front end connected to a lower part of a rear link 5 c that vertically faces the machine body constituting the link mechanism 5, and a front part of the machine frame F. Four fertilizer working sections 10 arranged in a row in the horizontal direction of the machine body, four sowing work sections 9 arranged in a line in the horizontal direction of the machine body at the rear of the machine frame F, One grounding float 12 arranged below is provided.

  The body frame F is connected to the rear link 5c via a rolling fulcrum shaft 5d facing the body front and rear. Therefore, the paddy field work apparatus A rolls with respect to the self-propelled vehicle around the rolling axis X of the rolling fulcrum shaft 5d.

  FIG. 7 is a plan view showing a lower part of the paddy field working apparatus A. FIG. As shown in FIGS. 3 and 6, the fuselage frame F includes a drive case 19 that is long in the horizontal direction of the fuselage frame, which is connected to the rolling fulcrum shaft 5 d on the front end side, and both lateral ends of the drive case 19. Each is provided with a pair of left and right transmission cases 26 extending in the rearward direction of the body frame.

  The drive case 19 forms a central portion in the lateral direction of the drive case 19 and has a feed case 19a whose front end side upper part is connected to the rolling fulcrum shaft 5d, and both lateral sides from the lower end side of the feed case 19a. A pair of left and right output shaft cases 24, 24 extending outward and constituting the lateral side portion of the drive case 19 and having the extended end portion connected to the base portion of the transmission case 26 are configured. .

  As shown in FIGS. 3, 4, and 6, the four sowing working units 9 include a seed feeding mechanism 28 having a feeding case 48 supported by a sowing frame 47 that is long in the lateral direction of the machine body, and an upper portion of the feeding case 48. A seed tank 27 and a seeding tube 29 extending downward from the lower part of the feeding case 48 toward the machine body.

  As shown in FIGS. 3, 4, 5, and 6, the seeding frame 47 that supports the four seed feeding mechanisms 28 is supported by a stay 46 that is attached to the upper ends of the extension ends of the pair of left and right transmission cases 26 and 26. ing. The seed tank 27 of the two working parts 9 on the left side of the machine body and the seed tank 27 of the two working parts 9 on the right side of the machine part of the four working parts 9 for sowing are integrally formed in one seed tank that communicates with the inside of the tank. Has been. The sowing cylinder 29 of each working part 9 for sowing is deployed so that the sowing opening on the extended end side of the sowing cylinder 29 is located near the upper part of the mud surface of the field in the descending operation state of the paddy field working device A. is there.

  The four sowing working units 9 are driven by the driving force from the engine 15 transmitted to the driving case 19 by the rotary transmission shaft 18 (see FIG. 1) extending rearward from the rear portion of the self-propelled vehicle. It is configured.

  That is, as shown in FIGS. 4, 6, and 7, the driving force transmitted from the engine 15 to the rotation transmission shaft 18 is input to the driving case 19 by the input shaft protruding forward from the lower end side front portion of the feed case 19 a. Then, the driving force input to the drive case 19 is input from the output shaft 23 provided in the output shaft case 24 to the base end side (front end side) of the pair of left and right transmission cases 26, 26. Two seed feeding mechanisms 28, 28 on the left side of the fuselage are output from the output shaft 41 through which the driving force input to the transmission case 26 on the left side is extended laterally at the extended end (rear end) of the transmission case 26. Is transmitted to a drive shaft 43 that drives the feeding roll 30 through a gear transmission mechanism 44. Two seed feeding mechanisms 28, 28 on the right side of the machine body are supplied from the output shaft 41, through which the driving force input to the transmission case 26 on the right side is extended laterally at the extended end (rear end) of the transmission case 26. Is transmitted to the drive shaft 43 through the gear transmission mechanism 44.

  Both ends of the output shaft 41 of the transmission case 26 are provided at the front shaft support portion 49a of the pair of front and rear annular shaft support portions 49a and 49b provided on a stay 49 (see FIG. 8) extending downward from the seeding frame 47. It is comprised so that it may be supported by. The projecting portion of the drive shaft 43 projecting from the feeding case 48 of each seed feeding mechanism 28 is configured to be supported by the rear shaft support portion 49b of the pair of front and rear shaft support portions 49a and 49b of the stay 49. is there.

  Accordingly, the paddy field work apparatus A feeds seeds stored in the various child tanks 27 from the seed tank 27 by the seed feeding mechanism 28 connected to the seed tank 27, and seeds the seeds fed by the various child feeding mechanisms 28. It is dropped from the tube 29 and supplied to the mud surface of the field.

  As shown in FIGS. 3, 5, and 6, four fertilizer working units 10 include a fertilizer feeding mechanism 57 having a feeding case 57 a supported by a fertilization frame 75, and a fertilizer attached to the upper portion of the feeding case 57 a. A tank 56, a fertilizer cylinder 58 extending downward from the discharge cylinder of the feeding case 57 a toward the rear side of the machine body, and a groove fertilizer 59 connected to the extended end of the fertilizer cylinder 58 via the bellows cylinder 63. It is prepared.

The fertilizer frame 75 that supports the fertilizer feed mechanism 57 of the four fertilizer working units 10 is supported by support columns 73 that are erected at both lateral ends of the drive case 19. The fertilizer tank 56 of the two working units 10 and 10 on the left side of the machine body and the fertilizer tank 56 of the two working units 10 and 10 on the right side of the machine body among the four working units 10 for fertilization are one fertilizer in which the inside of the tank communicates. It is integrally formed with the tank. The grooving fertilizers 59 of the four fertilizer working units 10 are arranged side by side in the horizontal direction of the machine so that they are positioned one by one on the lateral side of the sowing cylinder 29 of the four sowing working units 9 and supported by the grounding float 12. I'm allowed.

  The four working units 10 for fertilization are configured to be driven by the driving force from the engine 15 transmitted to the driving case 19.

That is, as shown in FIGS. 3, 5, and 6, the driving force input from the engine 15 to the drive case 19 is transmitted from the end of the output shaft 23 protruding from the left end of the output shaft case 24 via the interlock mechanism 71. Then, it is transmitted to one left driving drive shaft 67. The left feed drive shaft 67 is connected to a feed roll 66 provided in the two fertilizer feed mechanisms 57 and 57 on the left side of the machine body, and serves as a common feed drive shaft for the two fertilizer feed mechanisms 57 and 57 on the left side of the machine body. The driving force input to the drive case 19 is transmitted from the end portion of the output shaft 23 protruding from the right end portion of the output shaft case 24 to the single right extension drive shaft 67 via the interlocking mechanism 71. The right feed drive shaft 67 is connected to a feed roll 66 provided in the two fertilizer feed mechanisms 57 and 57 on the right side of the machine body, and serves as a common drive shaft for the two fertilizer feed mechanisms 57 and 57 on the right side of the machine body.

  As shown in FIGS. 3 and 5, the left and right interlocking mechanisms 71 convert the rotational driving force of the output shaft 23 into the reciprocating power of the interlocking rod 70 by the crank body 69, and the reciprocating power of the interlocking rod 70 is converted to the swing link 68. The reciprocating power in the set angle range is converted to reciprocating power, and only the reciprocating power of the swing link 68 in one direction is transmitted to the feed drive shaft 67 by the one-way rotary clutch 68a.

  Accordingly, the paddy field work apparatus A feeds the granular fertilizer stored in each fertilizer tank 56 from the fertilizer tank 56 by the fertilizer feed mechanism 57 connected to the fertilizer tank 56, and the fertilizer fed by each fertilizer feed mechanism 57. It is supplied to the groove fertilizer 59 through the fertilizer application 58, and the groove fertilizer 59 forms a groove on the mud surface of the field near the side of the work target places Pa and Pb by the working unit 9 for sowing, The fertilizer from the fertilizer application tube 58 is supplied to the formed groove. The groove after supplying the fertilizer is backfilled by the groove filling body 60 (see FIG. 3) located behind the groove fertilizer 59.

  As shown in FIGS. 3, 4, and 6, the paddy field work apparatus A is provided with a grooving body 14 disposed at the center in the horizontal direction of the machine body. More specifically, the grooving body 14 is arranged so as to be positioned between the work target positions Pb and Pb by the pair of work parts 9 and 9 inside the work parts 9 for sowing.

  As shown in FIGS. 4, 7, and 9, the grooved body 14 is supported by a support rod 55 that is connected over the extending end sides of the pair of left and right transmission cases 26 and 26. The support rod 55 is configured by a steel pipe having a circular longitudinal cross-sectional shape. The support rod 55 and the transmission case 26 are connected via a float support 51 having an upper end connected to the transmission case 26. The lower end side of the float support 51 is rotatably connected to a bracket 52 provided on the rear end side of the ground float 12, and the float support 51 rotatably supports the rear end side of the ground float 12. It is like that.

  As shown in FIGS. 7 and 8, the support structure for supporting the grooved body 14 on the support rod 55 is a support portion provided by attaching a sheet metal member to the support rod 55, and has a U-shape that opens forward in plan view. And a pair of left and right connecting arm portions 14b, 14b provided on the front end side upper portion 14a of the grooved body 14 and a pair of left and right connecting arm portions 14b, 14b of the grooved body 14 A connecting shaft 81 rotatably connected to the pair of vertical plate portions 80a, 80a, and a removable work height setting pin 83 disposed above the connecting shaft 81 and attached to the pair of left and right vertical plate portions 80a, 80a. And is configured.

  The grooving body 14 is provided with an operation arm 84 extending forward from the front end side upper portion 14a. The operation arm 84 and a spring hooking portion provided on a support frame 82 facing the body frame F supported by the body frame F are provided. The operating arm 84 is configured to be pulled up around the axis of the connecting shaft 81 by the attached spring 85. The support frame 82 is connected to the central portion in the longitudinal direction of the fertilizing frame 75 and the central portion in the longitudinal direction of the sowing frame 47, and is supported by the body frame F via the fertilizing frame 75 and the sowing frame 47.

  Therefore, when performing the sowing work and the fertilization work, the paddy field working apparatus A forms a drainage groove by the grooving body 14 on the mud surface of the field between the two sowing rows inside the machine body.

  That is, the grooved body 14 is supported so as to be swingable up and down around the axis of the connecting shaft 81, and the connecting arm portion 14 b comes into contact with the work height setting pin 83 by the pulling-up operation of the operating arm 84 by the spring 85. Received and supported. Therefore, the grooving body 14 becomes the ground work height set by the work height setting pin 83.

  That is, as shown in FIG. 8A, the ground reaction force applied to the grooved body 14 is weaker than the operating force of the spring 85 in a state in which the connecting arm portion 14b is applied to the work height setting pin 83. The grooving body 14 forms the drainage groove by allowing the lower portion to enter the mud while being maintained at the ground work height set by the work height setting pin 83.

  As shown in FIG. 8B, when the ground reaction force applied to the grooved body 14 is stronger than the operating force of the spring 85 in a state where the connecting arm portion 14 b is applied to the work height setting pin 83, the groove The cut body 14 is lifted by the ground reaction force so that the connecting arm portion 14b is moved forward from the work height setting pin 83, and the groove cut body 14 has a ground work height set by a balance between the spring 85 and the ground reaction force. Then, the drainage groove is formed by letting the lower part enter the mud at this ground work height. At this time, the spring 85 is pulled by the operation arm 84 to be in a state of applying a rising resistance to the grooved body 14, and the grooved body 14 is pressed against the mud by the spring 85.

  A pair of pin holes 86 and 87 for the working height setting pin 83 are provided in the vertical plate portion 80 a of the support portion 80, and the working height adjusting portion 88 is formed by the pair of pin holes 86 and 87 and the working height setting pin 83. It is comprised so that the ground work height of the groove cutting body 14 can be changed.

Fig.8 (a) is a side view which shows the groove cutting body 14 in the state which changed the ground work height low. As shown in this figure, when the work height setting pin 83 is attached to the rear pin hole 87 of the pair of pin holes 86, 87, the ground work height of the grooved body 14 is lowered.
That is, when the operating arm 84 is pulled up by the spring 85, the connecting arm portion 14b comes into contact with the working height setting pin 83 located on the rear side, and the working height setting pin 83 receives and supports the connecting arm portion 14b to cut the groove. The body 14 is set to a low ground work height.

FIG.8 (c) is a side view which shows the groove cutting body 14 in the state which adjusted the ground work height highly. As shown in this figure, by attaching the work height setting pin 83 to the front pin hole 86 of the pair of pin holes 86, 87, the ground work height of the grooved body 14 is increased.
That is, when the operating arm 84 is pulled up by the spring 85, the connecting arm portion 14b comes into contact with the working height setting pin 83 located on the front side, and the working height setting pin 83 receives and supports the connecting arm portion 14b to form a grooved body. 14 is set to a high ground work height.

A grooved body 14 indicated by a solid line in FIG. 3 shows the grooved body 14 in a state where the ground work height is set low by the work height setting pin 83, and the grooved body 14 indicated by a two-dot chain line in FIG. These show the grooved body 14 in a state where the ground work height is set high by the work height setting pin 83. As shown in this figure, the rear end 14c of the grooving body 14 in a state where the ground work height is adjusted to be high is positioned substantially at the same position as the rear end 9a of the feeding case 48 of each working part 9 for sowing. A grooved body 14 is provided on the surface. In more detail, the rear end 14c of the grooved member 14 is located slightly rearward from the rear end 9 a of the working unit 9.

A spreader connecting portion 90 having a support plate 90a is provided at the rear end portion of the support frame 82.
That is, as shown in FIG. 10, a chemical spreader 91 is disposed behind and connected to the sowing work unit 9, and when performing sowing and fertilization work, a work of spraying a chemical for weeding can be performed together. It is comprised so that.

[Another Example]
(1) In the above-described embodiment, an example in which the rear end 14c of the grooved body 14 is positioned substantially at the same position as the rear end 9a of the working unit 9 is shown. The rear end 9a may be located at the same position as the rear end 9a of the working unit 9, or the rear end 14c of the grooved body 14 may be configured to be positioned forward of the rear end 9a of the working unit 9.

(2) In the above-described embodiment, an example in which four working parts 9 for seeding are provided has been described, but two or five or more working parts 9 may be provided.

  In the present invention, in addition to the paddy field work machine provided with the working part 9 for sowing so as to be transmitted by the transmission case 26, the working part 10 for fertilization or the working part for seedling planting is transmitted by the transmission case 26. It can also be used for paddy field work machines that are configured as described above.

2 Rear wheel 2a Rear wheel passage mark 9 Working part 9a Rear end
12 Grounding float 14 Grooving body 14c Rear end 19 Drive case 26 Transmission case 55 Support rod 85 Spring 88 Work height adjustment part Pa, Pb Work target location

Claims (5)

A plurality of working units arranged in the lateral direction of the aircraft, a grounding float disposed on the lower side of the working unit, and a transmission case facing in the longitudinal direction of the aircraft are provided at the rear of the aircraft,
The driving force of the driving case is configured to be transmitted from the transmission case on the right side of the aircraft to the working portion on the right side of the aircraft, and the driving force of the driving case is transmitted from the transmission case on the left side of the aircraft to the working portion on the left side of the aircraft. Configured as
Aircraft lateral support rods connected across the transmission cases on the right and left sides of the aircraft,
A paddy field work machine in which a grooving body for forming a drainage groove in a field scene is disposed at the center in the lateral direction of the machine body on the rear side of the machine body of the grounding float and supported by the support rod. Deploying the working part behind the rear wheel,
The working unit adjacent to the rear of the rear wheel is set as a work target location on both lateral sides of the rear wheel passage trace of the farm scene, and the working unit on the lateral side outside the adjacent working unit. The paddy field work machine according to claim 1, wherein the rear wheel is arranged so that a position closer to the rear wheel passing trace than the working portion on the inner side of the machine body is a work target position.   The paddy field machine according to claim 1 or 2, wherein the grooving body is arranged so that a rear end of the grooving body is located at substantially the same position or a front side as a rear end of the working portion.   The paddy field work machine according to any one of claims 1 to 3, further comprising a work height adjustment unit that changes a ground work height of the grooved body.   The paddy field work according to any one of claims 1 to 4, further comprising a spring that supports the grooving body so that the grooving body can swing up and down, and that provides resistance to rising due to a ground reaction force of the grooving body. Machine.

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