Paddy field working machine

Abstract

To provide a paddy field working machine protecting a clutch operation part for intermittently operating a line clutch.SOLUTION: The rice transplanter includes a planting arm for planting seedlings on a rice field surface, a planting transmission case 14 for housing a driving mechanism for transmitting a driving force to the planting arm, a strip clutch 36 provided in the planting transmission case 14 and configured to intermittently transmit the driving force of the driving mechanism, a first clutch operation section 41 retractably supported on an upper surface portion of the planting transmission case 14 and configured to intermittently operate the strip clutch by sliding, and a cover 50 for covering the entire portion of the first clutch operation section 41 protruding upward from the upper surface portion of the planting transmission case.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a paddy field working machine. [Background technology]

[0002] Patent Document 1 describes a seedling planting device for a riding rice transplanter. This seedling planting device is equipped with a chemical feeder located higher than the planting transmission case and a mud cover to prevent mud from being splashed up during planting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-126272 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in the paddy field working machine disclosed in Patent Document 1, the planting transmission case has a built-in row clutch for operating and stopping the planting arm driven by the planting transmission case, and a clutch operating unit such as an operating arm that operates this row clutch on and off is provided on the outer surface of the planting transmission case. Note that the clutch operating unit such as an operating arm provided on the outer surface of the planting transmission case in this way is operated for each planting transmission case via a wire or the like.

[0005] However, since the clutch operating portion that operates the row clutch intermittently is disposed in an exposed state, there is a concern that mud may adhere to it, making smooth operation difficult.

[0006] For these reasons, there is a demand for a paddy field working machine that protects the clutch operating unit that operates the row clutch intermittently. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a paddy field working machine according to one embodiment of the present invention is characterized in that it comprises a planting arm that plants seedlings in the surface of the paddy field, a planting transmission case that houses a drive mechanism that transmits drive force to the planting arm, a row clutch that is provided in the planting transmission case and that interrupts the drive force of the drive mechanism, a first clutch operating unit that is supported on the upper surface of the planting transmission case so as to be able to move forward and backward and that operates the row clutch intermittently by sliding, and a cover that covers the entire portion of the first clutch operating unit that protrudes above the upper surface of the planting transmission case.

[0008] This configuration allows the cover to completely cover the portion of the first clutch operating unit that is exposed above the planting transmission case. This makes it difficult for mud and soil to adhere to the first clutch operating unit that operates the row clutch. This realizes a paddy field working machine that protects the clutch operating unit that operates the row clutch.

[0009] In the present invention, it is preferable that the cover is made of an elastic material.

[0010] With this configuration, the cover can be expanded and contracted in response to the sliding of the first clutch operating part.

[0011] In the present invention, it is preferable that a second clutch operating part is provided which engages with the first clutch operating part and slides the first clutch operating part by swinging around an operating shaft, and that a hole portion is formed in the cover to allow the second clutch operating part to be inserted therethrough.

[0012] With this configuration, the cover allows the second clutch operating part to be inserted. Therefore, the second clutch operating part can slide the first clutch operating part while the cover entirely covers the portion of the first clutch operating part that is exposed above the planting transmission case.

[0013] In the present invention, it is preferable that left and right clamping portions that clamp the first clutch operating portion from the left and right are formed at the swing end of the second clutch operating portion, and that two hole portions that allow the left and right clamping portions to be inserted are formed in the cover.

[0014] With this configuration, the cover covers the entire portion of the first clutch operating unit that is exposed above the planting transmission case, while the second clutch operating unit can slide and operate the first clutch operating unit using the left and right clamping portions that pass through the two hole portions.

[0015] In the present invention, it is preferable that the cover is formed with a sealing portion that separates a first internal space that communicates with the hole portion from a second internal space that does not communicate with the hole portion, and that the upper surface portion of the sealing portion is formed so as to be flush with the lower edge portion of the hole portion.

[0016] With this configuration, even if water or the like enters the first internal space through the hole, the water or the like will not accumulate on the seal portion but will easily escape from the lower edge of the hole.

[0017] In the present invention, it is preferable that the cover is inclined upward toward the front, with the upper portion being located closer to the front of the machine body, and the hole portion is formed in the inclined surface that is inclined upward toward the front at the front portion of the cover.

[0018] With this configuration, the holes are formed in the front of the cover. Therefore, for example, when an operator washes a planting arm or the like from the rear of the machine body, the washing water splashes on the rear of the cover, making it less likely to splash on the front of the cover. Furthermore, the cover is tilted upward at the front, and the holes are formed on the inclined surface at the front of the cover. This allows, for example, washing water to easily escape through the holes without accumulating inside the cover, even if the washing water seeps into the cover through the holes.

[0019] In the present invention, the cover has a bellows portion that is supported on the planting transmission case and expands and contracts in response to the sliding of the first clutch operating portion, an upper cover portion that accommodates the second clutch operating portion inserted through the hole portion, and a seal portion that isolates the bellows portion from the upper cover portion, and it is preferable that the seal portion engages with the first clutch operating portion.

[0020] With this configuration, the first clutch operating part is protected by the bellows part, and the second clutch operating part is protected by the upper cover part. Furthermore, the seal part engages with the first clutch operating part and separates the bellows part from the upper cover part. Therefore, even if mud or the like gets into the interior of the upper cover part through the hole, the mud or the like is less likely to get inside the bellows part.

[0021] In the present invention, it is preferable that the bellows portion, the upper cover portion and the seal portion are formed as a single unit.

[0022] With this configuration, the cover is configured as a single component, which avoids an increase in the number of components, and easily prevents increases in manufacturing costs, assembly costs, and the like.

[0023] In the present invention, it is preferable that the first clutch operating portion has a small diameter portion formed to have a smaller diameter than the top and bottom, and the seal portion is externally fitted to the small diameter portion.

[0024] With this configuration, the seal portion can securely separate the bellows portion from the cover portion. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is an overall side view of a riding rice transplanter. [Figure 2] FIG. [Figure 3] 10 is a side view showing the area of ​​the seedling planting device where the first clutch operating unit, the second clutch operating unit, and the cover are located. FIG. [Figure 4] FIG. 2 is an exploded perspective view showing a first clutch operating portion, a second clutch operating portion, and a cover. [Figure 5] 4 is a longitudinal cross-sectional view showing a portion of the seedling planting device where a first clutch operating unit, a second clutch operating unit, and a cover are present. FIG. [Figure 6] 1 is a perspective view showing a portion of the seedling planting device where a first clutch operating unit, a second clutch operating unit, and a cover are present. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a riding rice transplanter A (an example of a paddy field working machine), and Fig. 2 shows a plan view of a seedling planting device 5. In these drawings, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the rightward direction, and L indicates the leftward direction.

[0027] (Overall configuration of riding rice transplanter) As shown in Figure 1, the riding rice transplanter A has a traveling body 3 that travels on right and left front wheels 1 and right and left rear wheels 2. A seedling planting device 5 is supported at the rear end of a link mechanism 4 that extends rearward from the rear of the traveling body 3. A fertilizing device 6 is supported at the rear of the traveling body 3, and a soil leveling device E is disposed in front of the seedling planting device 5.

[0028] A hydraulic cylinder 7 is connected between the rear of the traveling body 3 and the link mechanism 4. The hydraulic cylinder 7 is driven to extend and retract, causing the seedling planting device 5 to rise and fall.

[0029] A driver's seat 8 and a steering handle 9 are provided on the traveling body 3. The driver uses the steering handle 9 to steer the front wheels 1. Right and left support frames 10 are connected to the right and left front parts of the traveling body 3. These support frames 10 are equipped with a spare seedling loading tray 11. Mat-shaped seedlings to be replenished to the seedling loading tray 18 of the seedling planting device 5 are placed on the spare seedling loading tray 11.

[0030] (Configuration of seedling planting device) As shown in Figures 1 to 3, the seedling planting device 5 is configured as an 8-row planting type and has a feed case 12, a support frame 13, multiple planting transmission cases 14, multiple rotating cases 15, multiple planting arms 16, multiple floats 17, and a seedling carrying table 18.

[0031] The feed case 12 is supported at the rear of the link mechanism 4. The support frame 13 is a square pipe extending in the left-right direction and is connected to the feed case 12. The front ends of the multiple (four) planting transmission cases 14 are connected to the support frame 13, and extend behind the traveling body 3.

[0032] The rotating case 15 is located on the right and left rear of the planting transmission case 14 and is rotatably supported on the planting transmission case 14 by a left-right rotating drive shaft 35. A pair of planting arms 16 is attached to the rotating case 15.

[0033] The seedling carrying tables 18 are supported by sliding rails 19 provided on the upper surfaces of the multiple planting transmission cases 14. A pair of planting arms 16 attached to the rotating case 15 cuts the seedlings from the lower end of the mat row seedlings placed on the seedling carrying tables 18 and plants them in the rice field G as the rotating case 15 rotates.

[0034] As the traveling body 3 of this riding rice transplanter A advances, the leveling device E levels the rice field surface G. As the traveling body 3 advances, the seedling planting device 5 also drives the seedling loading platform 18 back and forth in the left-right direction. As a result, the planting arm 16 successively cuts out the seedlings from the bottom end of the mat of row seedlings placed on the seedling loading platform 18 and plants them in the rice field surface G.

[0035] (Drive configuration of seedling planting device) As shown in Figures 1 to 4, power from an engine (not shown) mounted on the traveling machine body 3 is transmitted to the feed case 12 from the transmission shaft 20. An input shaft 31 extending in the left-right direction is built into the front end of each of the multiple planting transmission cases 14. Each input shaft 31 is connected to an intermediate drive shaft 32. Each intermediate drive shaft 32 is arranged coaxially with the input shaft 31. The multiple intermediate drive shafts 32 are housed in corresponding cylindrical cases 37.

[0036] A driven shaft 21 is provided which is connected to the central one of the multiple intermediate drive shafts 32 in the left-right direction. The driving force transmitted to the feed case 12 is transmitted to this driven shaft 21 via a drive chain 22. In this way, the driving force transmitted to the feed case 12 is transmitted to the multiple input shafts 31 and the multiple intermediate drive shafts 32.

[0037] The planting transmission case 14 is equipped with a torque limiter 33 at a position where it transmits the driving force transmitted to the multiple input shafts 31 to the driving sprocket. This torque limiter 33 is provided inside each of the multiple planting transmission cases 14. The planting transmission case 14 is equipped with a transmission chain 34 that transmits the driving force from the driving sprocket to which the driving force is transmitted from the torque limiter 33 to the driven sprocket of the rotary drive shaft 35 at the rear of the planting transmission case 14. This transmission chain 34 is housed inside each of the multiple planting transmission cases 14. The transmission chain 34 corresponds to the "drive mechanism."

[0038] The planting transmission case 14 is provided with a row clutch 36 for each of the multiple rotary drive shafts 35. The row clutch 36 connects and disconnects the driving force transmitted from the transmission chain 34 to the rotary drive shafts 35.

[0039] As shown in Figures 3 and 4, the planting transmission case 14 is provided with a clutch operating shaft 41 and a clutch operating lever 42. The clutch operating shaft 41 and the clutch operating lever 42 operate to intermittently operate the driving force transmitted from the transmission chain 34 to the rotary drive shaft 35. The clutch operating shaft 41 corresponds to the "first clutch operating part." The clutch operating lever 42 corresponds to the "second clutch operating part."

[0040] The clutch operating shaft 41 operates the row clutch 36 while being inserted through a hole 14a drilled in the upper surface of the planting transmission case 14. For this reason, the clutch operating shaft 41 is supported on the upper surface of the planting transmission case 14 so as to be able to move forward and backward.

[0041] The planting transmission case 14 has a rib 14c that protrudes upward from the top surface, and the rib 14c has a hole 14d. The clutch operating lever 42 is supported by the rib 14c of the planting transmission case 14 via an operating shaft 44 that serves as a swing fulcrum, and operates by pushing in the clutch operating shaft 41. As will be described later, the clutch operating shaft 41 is covered by a cover 50.

[0042] A plain washer 44A is provided at one end of the operating shaft 44. A head 44B abuts against the plain washer 44A. An end of the operating wire 43 is connected to a lower end 47a of the torsion spring 47. An upper end 47b of the torsion spring 47 abuts against an upper portion of the clutch operating lever 42 from above. The torsion spring 48 biases the clutch operating lever 42 to the state before the clutch operating shaft 41 is pushed in (a state in which the clutch operating shaft 41 is in a non-operating state).

[0043] The operating shaft 44 is supported on the planting transmission case 14 by the threaded portion 44D engaging with the hole 14d of the rib 14c of the planting transmission case 14. Then, the torsion spring 47, clutch operating lever 42, and torsion spring 48 are inserted into the support shaft 44E of the operating shaft 44 in this order, so that the operating shaft 44 supports the torsion spring 48, clutch operating lever 42, and torsion spring 47 on the planting transmission case 14. The torsion spring 47 is held by the flat washer 44A and the clutch operating lever 42. The torsion spring 48 is also held by the rib 14c and the clutch operating lever 42.

[0044] When the clutch operating shaft 41 is in the non-operated state, the clutch operating shaft 41 protrudes upward from the hole 14a, and the row clutch 36 maintains the transmission state. When the operating wire 43 is pulled, the upper part of the clutch operating lever 42 receives a pressing force from the torsion spring 47 so as to swing downward. When the upper part of the clutch operating lever 42 swings downward, the clutch operating shaft 41 is pressed in. This switches the row clutch 36 from the transmission state to the disengagement state.

[0045] The clutch operating shaft 41, clutch operating lever 42, torsion spring 47, torsion spring 48, and operating wire 43 are provided in the same number as the planting transmission case 14. The front ends of these operating wires 43 are connected to a manually operated lever or a mechanism that selectively pulls and operates the multiple operating wires 43 using the driving force of an electric motor.

[0046] By interrupting transmission with the row clutch 36 in each of the multiple planting transmission cases 14, planting of seedlings can be stopped for each of the two planting arms 16 provided on each planting transmission case 14.

[0047] When the pulling operation of the operating wire 43 is released, the upper part of the clutch operating lever 42 swings upward due to the biasing force of the torsion spring 48, and the clutch operating shaft 41 is pulled upward to change its state to the non-operating state. As a result, the row clutch 36 switches from the disengaged state to the transmitting state.

[0048] (Configuration of the cover that covers the clutch operating shaft) As shown in Figures 3 to 6, the clutch operating shaft 41 is covered with a cover 50. The cover 50 is made of an elastic material. The elastic material may be, for example, rubber, soft urethane resin, or silicone resin. The cover 50 has a bellows portion 50a, a seal portion 50b, and an upper cover portion 50c. The bellows portion 50a, the upper cover portion 50c, and the seal portion 50b are formed as a single unit.

[0049] The clutch operating shaft 41 has a first thin-diameter portion 41a and a second thin-diameter portion 41b formed at its upper portion. The second thin-diameter portion 41b is located lower than the first thin-diameter portion 41a. The outer diameter of the second thin-diameter portion 41b of the clutch operating shaft 41 is smaller than the outer diameter of the portion between the first thin-diameter portion 41a and the second thin-diameter portion 41b and the outer diameter of the portion adjacent to and below the second thin-diameter portion 41b. The outer diameter of the second thin-diameter portion 41b and the inner diameter of the seal portion 50b are substantially the same. Therefore, the seal portion 50b fits over the entire circumference of the second thin-diameter portion 41b. That is, the clutch operating shaft 41 has a second thin-diameter portion 41b (thin-diameter portion) formed with smaller diameters at the top and bottom, and the seal portion 50b fits over the second thin-diameter portion 41b. In this manner, the seal portion 50b engages with the clutch operating shaft 41.

[0050] The upper cover portion 50c is located above the seal portion 50b. The upper cover portion 50c covers a portion of the clutch operating shaft 41 that is above the second small diameter portion 41b. The interior of the upper cover portion 50c is configured as a first internal space S1.

[0051] The outer diameter of the first small diameter portion 41a is smaller than the outer diameter of the portion between the first small diameter portion 41a and the second small diameter portion 41b and the outer diameter of the upper end portion of the clutch operating shaft 41. In addition, left and right clamping portions 42a are formed at the swing end portion of the clutch operating lever 42.

[0052] Two holes 50h are drilled in the upper cover portion 50c. The two holes 50h allow the left and right clamping portions 42a to pass through. The upper cover portion 50c accommodates the clamping portion 42a of the clutch operating lever 42 inserted through the hole 50h. The left and right clamping portions 42a are inserted through the two holes 50h and enter the first internal space S1. The left and right clamping portions 42a are adjacent to the first small diameter portion 41a. The left and right clamping portions 42a abut against the upper and lower enlarged diameter portions of the first small diameter portion 41a of the clutch operating shaft 41, respectively. This configuration allows the clutch operating lever 42 to push in and pull out the clutch operating shaft 41. In this way, the left and right clamping portions 42a clamp the clutch operating shaft 41 from the left and right.

[0053] The bellows portion 50a is formed in a shape in which a mountain shape and a valley shape are connected in a cross-sectional view. The lower surface of the bellows portion 50a is fixed to the upper surface of the planting transmission case 14. The bellows portion 50a is supported by the planting transmission case 14 and expands and contracts in response to the sliding of the clutch operating shaft 41. The space inside the bellows portion 50a is configured as a second internal space S2.

[0054] When the clutch operating shaft 41 is pushed in, the bellows portion 50a contracts. When the clutch operating shaft 41 is pulled in, the bellows portion 50a expands. The seal portion 50b separates the first internal space S1 from the second internal space S2. In other words, the seal portion 50b separates the bellows portion 50a from the upper cover portion 50c. However, when the bellows portion 50a expands or contracts, the air in the second internal space S2 expands or contracts. For this reason, in order to smoothly slide the clutch operating shaft 41, it is necessary to let air in and out of the second internal space S2 via the seal portion 50b. For this reason, there is a limit to how much tension the seal portion 50b can provide.

[0055] When outside air enters the second internal space S2 through the seal portion 50b, for example, if mud from the field enters the second internal space S2 along with the air, there is a risk that the clutch operating shaft 41 will become stuck inside the planting transmission case 14 and become unable to slide. In this embodiment, the cover 50 covers the entire portion of the clutch operating shaft 41 that protrudes above the top surface of the planting transmission case 14. Therefore, compared to a configuration in which the cover 50 does not entirely cover the protruding portion of the clutch operating shaft 41, mud is less likely to adhere to the seal portion 50b and enter the second internal space S2. This makes it possible to both suppress tension in the seal portion 50b and make the seal portion 50b waterproof.

[0056] In this embodiment, the cover 50 is inclined upward toward the front, with the upper portion positioned closer to the front of the machine. The holes 50h are formed on a sloped surface that slopes upward toward the front at the front of the cover 50. With this configuration, even when the seedling planting device 5 is being washed with a high-pressure washer, for example, high-pressure washing water is sprayed on the rear portion of the cover 50, but is less likely to be sprayed on the front portion of the cover 50. This makes it difficult for high-pressure washing water to enter the first internal space S1 through the holes 50h, and makes it difficult for high-pressure washing water, mud, and the like to enter the second internal space S2 via the seal portion 50b.

[0057] Furthermore, in this embodiment, the two holes 50h extend to the seal portion 50b. In other words, the upper surface of the seal portion 50b is formed to be flush with the lower edge of the hole 50h. The upper surface of the seal portion 50b is inclined so that it is positioned lower toward the front. With this configuration, even if high-pressure cleaning water, mud, etc. enters the first internal space S1 through the hole 50h, the high-pressure cleaning water, mud, etc. will flow out from the upper surface of the seal portion 50b through the hole 50h due to its own weight.

[0058] [Another embodiment] The present invention is not limited to the configurations exemplified in the above-described embodiments, and other representative embodiments of the present invention will be exemplified below.

[0059] (1) In the above-described embodiment, left and right clamping portions 42a are formed at the pivoting end of the clutch operating lever 42, but this is not limited to this embodiment. For example, a configuration may be adopted in which one clamping portion 42a is formed at the pivoting end of the clutch operating lever 42, one hole is formed in the upper part of the clutch operating shaft 41, and the clamping portion 42a passes through the hole in the clutch operating shaft 41. In this case, a configuration may be adopted in which one hole 50h is drilled in the upper cover portion 50c of the cover 50.

[0060] (2) In the above-described embodiment, the clutch operating shaft 41 and the cover 50 are inclined upward toward the front, with the upper portion being closer to the front of the vehicle. This embodiment is not limited to this, and the clutch operating shaft 41 and the cover 50 may be configured to stand vertically. Furthermore, the hole 50h is not limited to being formed on a sloped surface that slopes upward toward the front of the cover 50, and may be formed on the left and right side surfaces of the cover 50.

[0061] (3) In the above-described embodiment, the upper surface of the seal portion 50b is formed to be flush with the lower edge of the hole 50h. However, the present invention is not limited to this embodiment, and the lower edge of the hole 50h may extend below the upper surface of the seal portion 50b, forming a step between the lower edge of the hole 50h and the upper surface of the seal portion 50b.

[0062] (4) The drive mechanism housed in the planting transmission case 14 is not limited to the transmission chain 34. For example, the drive mechanism housed in the planting transmission case 14 may be a gear mechanism or a shaft.

[0063] (5) In the above embodiment, a riding rice transplanter is used as an example of a paddy field working machine. However, the paddy field working machine is not limited to this embodiment, and may be, for example, a seed sowing machine or a walk-behind rice transplanter.

[0064] (6) In the above-described embodiment, the bellows portion 50a, the upper cover portion 50c, and the seal portion 50b are formed as a single unit. However, this embodiment is not limited thereto, and the bellows portion 50a, the upper cover portion 50c, and the seal portion 50b may be formed as separate units. For example, the seal portion 50b may be an O-ring, a gasket, or the like, and the seal portion 50b as an O-ring or a gasket may be fitted around the second narrow diameter portion 41b, and the upper portion of the bellows portion 50a may be fitted around the seal portion 50b. The upper cover portion 50c may cover at least one of the bellows portion 50a and the seal portion 50b. In this case, the connecting portion between the upper cover portion 50c and the bellows portion 50a or the connecting portion between the upper cover portion 50c and the seal portion 50b may have a so-called spigot structure (sleeve joint structure). The upper cover portion 50c may also be made of a hard resin, metal, or the like.

[0065] (7) In the above-described embodiment, two holes 50h are drilled in the upper cover portion 50c. However, this is not limiting. Only one hole 50h may be drilled in the upper cover portion 50c, and the hole 50h may be formed large enough to allow the left and right clamping portions 42a to be inserted therethrough. Three or more holes 50h may be drilled in the upper cover portion 50c. For example, two left and right holes 50h may be drilled, and two other left and right holes 50h may be drilled either above or below the two left and right holes 50h, for a total of four holes 50h. In this case, depending on the shapes of the left and right clamping portions 42a, the stroke amount of the clutch operating shaft 41, and the like, the left and right clamping portions 42a may be inserted into the left and right holes 50h at either the top or bottom. Alternatively, three or more holes 50h may be drilled in the left-right direction. In this case, the clamping portions 42a may be configured to be inserted into any two of the three or more hole portions 50h depending on the distance between the left and right clamping portions 42a.

[0066] (8) The holes 50h may be formed across the upper and lower ends of the upper cover portion 50c.

[0067] (9) In the above-described embodiment, the seal portion 50b is disposed on the outer surface of the second narrow diameter portion 41b (thin diameter portion), and the second narrow diameter portion 41b is formed to have a circular shape in cross section. However, this is not limited to this embodiment, and the second narrow diameter portion 41b may be formed to have a polygonal shape in cross section. In this case, the inner peripheral portion of the seal portion 50b may also be formed to have a polygonal shape.

[0068] The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments, unless a contradiction arises. Furthermore, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these, and can be modified as appropriate within the scope of the purpose of the present invention. [Industrial Applicability]

[0069] The present invention is applicable to paddy field working machines. [Explanation of symbols]

[0070] 14: Planting transmission case 16: Planting arm 34: Transmission chain (drive mechanism) 36: Row clutch 41: Clutch operating shaft (first clutch operating part) 41b: Second narrow diameter part (narrow diameter part) 42: Clutch operating lever (second clutch operating part) 42a: Holding part 44: Operation axis 50: Cover 50a: Bellows section 50b: Seal part 50c: Overcover part 50h: Hole G: Tanmen S1: First internal space S2:Second internal space

Claims

1. A planting arm that plants seedlings on the rice field surface, A planting transmission case that accommodates a drive mechanism that transmits driving force to the planting arm; A row clutch provided in the planting transmission case for interrupting the driving force of the drive mechanism; A first clutch operating unit that is supported on the upper surface of the planting transmission case so as to be able to move forward and backward and that operates the row clutch intermittently by sliding; A paddy field working machine equipped with a cover that covers the entire portion of the first clutch operating unit that protrudes above the upper surface of the planting transmission case.

2. 2. The paddy field working machine according to claim 1, wherein the cover is made of an elastic material.

3. a second clutch operating part that engages with the first clutch operating part and slides the first clutch operating part by swinging about an operating shaft; The paddy field working machine according to claim 1, wherein the cover is formed with a hole that allows the second clutch operating part to be inserted therethrough.

4. Left and right clamping portions that clamp the first clutch operating portion from the left and right are formed at the swing end portions of the second clutch operating portion, 4. The paddy field working machine according to claim 3, wherein the cover is formed with two holes that allow the left and right clamping parts to be inserted therethrough.

5. a seal portion is formed in the cover to separate a first internal space communicating with the hole portion from a second internal space not communicating with the hole portion; 5. The paddy field working machine according to claim 3, wherein an upper surface of the seal portion is formed so as to be flush with a lower edge of the hole portion.

6. The cover is inclined upward toward the front, and is positioned toward the front of the machine body toward the upper side. The paddy field working machine according to claim 3 or 4, wherein the hole is formed in the front-rising inclined surface at the front part of the cover.

7. The cover has a bellows portion that is supported by the planting transmission case and expands and contracts in response to the sliding of the first clutch operating portion, an upper cover portion that accommodates the second clutch operating portion inserted through the hole portion, and a seal portion that isolates the bellows portion from the upper cover portion, 5. The paddy field working machine according to claim 3, wherein the seal portion is engaged with the first clutch operating portion.

8. 8. The paddy field working machine according to claim 7, wherein the bellows portion, the upper cover portion and the seal portion are formed as a single unit.

9. The first clutch operating portion has a small diameter portion formed to have a smaller diameter than the top and bottom, The paddy field working machine according to claim 7, wherein the seal portion is externally fitted to the narrow diameter portion.

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