Rice transplanter

Abstract

A rice transplanter is provided with: a plurality of planting arms for planting seedlings on a field surface; a plurality of planting transmission cases (14) for transmitting driving force to the planting arms; a few-row clutch which is provided in the planting transmission case (14) and which connects / disconnects the driving force transmitted to the planting arm; a clutch operation unit that performs on / off operation on the few rows of clutches by swinging around an operation shaft (44); and a cover (50) that covers the clutch operation unit.

Description

Technical Field

[0001] The present invention relates to a technique for suppressing soil from adhering to the vicinity of a planting transmission case that extends rearward of a traveling body. Background Art

[0002] Patent Document 1 describes a seedling planting device for a riding type rice transplanter. The seedling planting device has a chemical supply device at a position higher than the planting transmission case, and has a mudguard for preventing mud splashed during planting from splashing.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-126272 Summary of the Invention

[0006] As described in Patent Document 1, in a rice transplanter having a chemical supply device, the chemical supply device is supported by a support rod whose lower end is fixed to the planting transmission case. In addition, a few-row clutch is provided inside the planting transmission case to operate the planting arm driven by the planting transmission case to drive and stop, and an operation portion such as an operation arm for performing a connection / disconnection operation on the few-row clutch is provided on the outer surface of the planting transmission case.

[0007] It should be noted that the operation arm and the like provided on the outer surface of the planting transmission case are operated by each planting transmission case via a wire or the like.

[0008] In addition, the operation arm and the like for performing the connection / disconnection operation on the few-row clutch are arranged in an exposed state, so there is a risk that soil will adhere and it will be difficult to work smoothly.

[0009] For this reason, a rice transplanter that can protect the clutch operation portion for performing the connection / disconnection operation on the few-row clutch is needed.

[0010] To achieve the above object, a rice transplanter according to an embodiment of the present invention includes: a plurality of planting arms for planting seedlings on the paddy field surface; a plurality of planting transmission cases for transmitting driving force to the planting arms; a few-row clutch provided in the planting transmission case for connecting / disconnecting the driving force transmitted to the planting arms; a clutch operation portion for performing a connection / disconnection operation on the few-row clutch by swinging around an operation axis; and a cover for covering the clutch operation portion.

[0011] In the structure of the planting transmission case with a cover for mudguard, it is difficult to connect the lower end of the support rod described in Patent Document 1. In particular, a riding type rice transplanter may optionally be equipped with a device for spreading substances other than chemicals. Regarding such technical problems, when the lower end of the support rod is connected to the planting transmission case by forming at least an insertion opening through which the lower end portion of the support rod can be inserted in the cover, the cover does not interfere with the arrangement of the support rod by inserting the support rod through the insertion opening of the cover.

[0012] According to this structure, by covering the clutch operation portion with the cover, for example, even when mud splashes during the planting work, it is possible to suppress mud from adhering to the clutch operation portion. Therefore, it is possible to protect the clutch operation portion that performs the connection / disconnection operation of the few-row clutch.

[0013] In addition, it may be that the cover is supported by the operation shaft on the planting transmission case.

[0014] According to this structure, by using the operation shaft of the clutch operation portion to support the cover, the cover can be supported on the planting transmission case with a simple and effective structure.

[0015] In addition, it may be that the planting transmission case has a rib for fixing the support rod that supports the equipment, and the rib protrudes from the cover in a state where the clutch operation portion is covered.

[0016] The rice transplanter can be equipped with equipment such as a chemical spreading device. The equipment is sometimes supported on the planting transmission case or the like via a support rod. At this time, the support rod is supported by the rib of the planting transmission case.

[0017] According to the above structure, the cover does not cover the rib on which the support rod is supported. Therefore, even when a cover is provided on the planting transmission case, it is possible to prevent the cover from interfering with the support of the equipment (support rod) on the planting transmission case. As a result, it is possible to easily support the equipment on the planting transmission case while protecting the clutch operation portion.

[0018] In addition, it may be that one end of the operation shaft has a first fixing portion for supporting the cover, and the other end has a second fixing portion. The operation shaft penetrates the cover in a state where the clutch operation portion is covered and the clutch operation portion, and the operation shaft fixes the cover through the first fixing portion and is fixed to the planting transmission case through the second fixing portion.

[0019] According to this structure, by using the first fixing portion and the second fixing portion of the operation shaft to fix the operation shaft to the rib while supporting the cover, the cover can be supported on the planting transmission case. Therefore, it is possible to easily support the cover on the planting transmission case through the operation shaft.

[0020] Alternatively, the first fixing portion may be an external thread, and a nut may be used to fix the cover. The second fixing portion may be a flat washer having an internal thread. In a state where a bolt is screwed to the internal thread via the transplanting transmission case and bolt-fixed to the transplanting transmission case, the clutch operation portion is held by the flat washer.

[0021] According to this structure, by using an external thread and a nut to more easily support the cover and screwing the internal thread with the rib, the operating shaft can be easily fixed to the transplanting transmission case. As a result, the cover can be more easily supported on the transplanting transmission case using the operating shaft.

[0022] Alternatively, the cover may have an insertion opening.

[0023] In a structure where the transplanting transmission case is provided with a cover for mudguards, it is difficult to connect the lower end of the support rod described in Patent Document 1. In particular, a rice transplanter may optionally be provided with equipment for spreading substances other than chemicals. In view of such technical problems, in the case where the lower end of the support rod is connected to the transplanting transmission case by forming at least an insertion opening through which the lower end portion of the support rod can be inserted in the cover, by inserting the support rod through the insertion opening of the cover, it is possible to prevent the cover from interfering with the arrangement of the support rod.

[0024] Alternatively, the cover may have an upper wall portion, left and right side wall portions, and a longitudinal rear wall portion. At least one of the left and right side wall portions is connected and fixed to the transplanting transmission case. The cover is formed of a resin capable of cutting out a predetermined opening area provided in the area from the rear wall portion to the upper wall portion to form the insertion opening.

[0025] According to this structure, by cutting out the opening predetermined area corresponding to the shape of the lower end of the support rod in the cover, an insertion opening suitable for inserting the lower end of the support rod can be formed.

[0026] Alternatively, at least one of the pair of left and right side wall portions may be formed with a through-hole-shaped bolt insertion hole for fixing the cover to the transplanting transmission case. When the cover is molded using a mold, a recess for arranging the pinch-off portion of the mold for forming the bolt insertion hole is formed in the side wall portion.

[0027] According to this structure, a recess is formed in the side wall portion of the cover, and by using a mold for pinching off, a bolt insertion hole for bolt insertion can be formed in the side wall portion.

[0028] Alternatively, the cover may further include a front wall portion that protrudes from the front end of the upper wall portion when the cover is molded, and the protruding end is formed so as to be bendable downward.

[0029] According to this structure, when forming the cover using resin, the front wall can be formed by forming it to extend forward from the front end of the upper wall portion and bending the protruding end downward. As a result, a cover having an upper wall portion, left and right side wall portions, a rear wall portion, and a front wall portion can be manufactured by simple molding.

[0030] In addition, it may be that a plurality of the opening predetermined regions are set in the cover, and the wall thicknesses of the plurality of the opening predetermined regions are different.

[0031] According to this structure, for example, the insertion opening can be formed in the opening predetermined region by cutting a part of the cover along the boundary portion with different wall thicknesses.

[0032] In addition, it may be that the wall thicknesses of the plurality of the opening predetermined regions are set to be thinner than the wall thicknesses of other regions of the cover.

[0033] According to this structure, since the wall thickness of the opening predetermined region is thinner than the wall thicknesses of other regions of the cover, the cutting operation can be easily performed.

[0034] In addition, it may be that the cover is made of resin and has: a first main body portion; a second main body portion; and a connecting portion that connects the first main body portion and the second main body portion, and the cover covers the clutch operation portion in a state of being bent at the connecting portion and the first main body portion being in contact with the second main body portion.

[0035] The cover has a three-dimensional shape such as a region for setting the clutch operation portion that covers the surface of the planting transmission case. When integrally molding the cover using resin, it is difficult to mold such a three-dimensional shape.

[0036] According to the above structure, the three-dimensional shape of the cover can be formed by integrally molding the unfolded three-dimensional shape of the cover and bending it. Thus, a resin cover can be easily integrally molded. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is an overall side view of a riding type rice transplanter.

[0038] Figure 2 is a top view of a seedling planting device.

[0039] Figure 3 is a side view of a portion of the seedling planting device having a cover.

[0040] Figure 4 is an exploded perspective view of a planting transmission case and the cover of Embodiment 1.

[0041] Figure 5 is a perspective view of a planting transmission case with the cover of Embodiment 1 attached.

[0042] Figure 6 It is a perspective view of the transplanting transmission case equipped with the cover of Embodiment 1.

[0043] Figure 7 It is a perspective view showing the state where the cover of Embodiment 1 is unfolded.

[0044] Figure 8 It is a perspective view showing the cover of Embodiment 1.

[0045] Figure 9 It is an exploded perspective view of the transplanting transmission case and the cover of Embodiment 2.

[0046] Figure 10 It is a front view of the cover of Embodiment 2.

[0047] Figure 11 It is a perspective view of the cover of Another Embodiment (a).

[0048] Figure 12 It is a side view of the part equipped with the cover of Another Embodiment (a).

[0049] Figure 13 It is a perspective view of the cover of Another Embodiment (b).

[0050] Figure 14 It is a side view of the part equipped with the cover of Another Embodiment (b). Detailed Embodiment

[0051] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0052] Figure 1 A riding-type rice transplanter A (an example of a rice transplanter) is shown, Figure 2 and a plan view of the seedling transplanting device 5 is shown. In these figures, F represents the front direction, B represents the rear direction, U represents the upper direction, D represents the lower direction, R represents the right direction, and L represents the left direction.

[0053] (Overall Structure of Riding-Type Rice Transplanter)

[0054] As Figure 1 shown, the riding-type rice transplanter A includes a traveling body 3 that travels by means of right and left front wheels 1 and right and left rear wheels 2. The seedling transplanting device 5 is supported at the rear end of a link mechanism 4 that extends rearward from the rear part of the traveling body 3. A fertilizer application device 6 is supported at the rear part of the traveling body 3, and a soil tilling device E is arranged in front of the seedling transplanting device 5.

[0055] A hydraulic cylinder 7 is connected so as to straddle the rear part of the traveling body 3 and the link mechanism 4. The seedling transplanting device 5 is lifted and lowered by the telescopic drive of the hydraulic cylinder 7.

[0056] The driver's seat 8 and the steering wheel 9 for steering the front wheels 1 are provided on the traveling body 3. The right and left pillar-shaped frames 10 are connected to the right and left parts of the front portion of the traveling body 3. A preparatory seedling placement table 11 is provided on the pillar-shaped frame 10. The preparatory seedling placement table 11 places the mat-shaped seedlings to be replenished to the seedling placement table 18 of the seedling transplanter 5.

[0057] (Structure of the seedling transplanter)

[0058] As Figures 1 to 3 shown, the seedling transplanter 5 has a feed tank 12, a support frame 13, a plurality of planting transmission cases 14, a plurality of rotating cases 15, a plurality of planting arms 16, a plurality of floating plates 17, and a seedling placement table 18, and is configured for eight-row planting.

[0059] The feed tank 12 is supported at the rear of the link mechanism 4. The support frame 13 is a square tube extending in the left-right direction and is connected to the feed tank 12. A plurality of (four) planting transmission cases 14 extend rearward of the traveling body 3 by connecting their respective front ends to the support frame 13.

[0060] The rotating cases 15 are arranged at the right and left parts of the rear of the planting transmission cases 14 and are rotatably supported by the planting transmission cases 14 via a rotating drive shaft 35 in the left-right direction. A pair of planting arms 16 are assembled to the rotating cases 15.

[0061] The seedling placement table 18 is supported by a sliding rail 19 provided on the upper surface of the plurality of planting transmission cases 14. A pair of planting arms 16 assembled to the rotating cases 15 perform the work of taking out seedlings from the lower end of the mat-shaped seedlings placed on the seedling placement table 18 and planting them on the field surface G as the rotating cases 15 rotate.

[0062] This riding-type rice transplanter A levels the field surface G by the leveling device E as the traveling body 3 advances. In addition, the seedling transplanter 5 reciprocally drives the seedling placement table 18 in the left-right direction as the traveling body 3 advances. Thus, the planting arms 16 sequentially take out seedlings from the lower end of the mat-shaped seedlings placed on the seedling placement table 18 and plant them on the field surface G.

[0063] (Fertilizing device)

[0064] As Figure 1 shown, the fertilizing device 6 has a hopper 21, a feeding part 22, a blower 23, a furrow opener 24, and a hose 25.

[0065] The fertilizing device 6 stores fertilizer in the hopper 21. In addition, the fertilizing device 6 feeds the fertilizer stored in the hopper 21 to the hose 25 by the feeding part 22 as the traveling body 3 advances.

[0066] The fertilizer delivered is supplied to the furrow opener 24 by the flow of air supplied from the blower 23. The furrow opener 24 is arranged at a position where the front end is inserted below the field surface G, and supplies the fertilizer to the furrow formed in the field surface G by the furrow opener 24. The furrow formed in the field surface G by the furrow opener 24 is backfilled by a covering member (not shown) as the traveling machine body 3 travels.

[0067] (Drive Structure of Seedling Planting Device)

[0068] As Figures 1 to 4 shown, the power of the engine (not shown) mounted on the traveling machine body 3 is transmitted from the transmission shaft 26 to the feed tank 12. Input shafts 31 extending in the left-right direction are provided at the front end portions of the plurality of planting transmission cases 14. Each input shaft 31 is connected to an intermediate drive shaft 32, and each intermediate drive shaft 32 and the input shaft 31 are arranged on the same axis. The plurality of intermediate drive shafts 32 are accommodated in their respective cylindrical cases 37.

[0069] A driven shaft 28 is provided which is connected to the intermediate drive shaft 32 at the center in the left-right direction among the plurality of intermediate drive shafts 32. The driving force transmitted to the feed tank 12 is transmitted to the driven shaft 28 via a drive chain 29. Thus, the driving force transmitted to the feed tank 12 is transmitted to the plurality of input shafts 31 and the plurality of intermediate drive shafts 32.

[0070] The planting transmission case 14 is provided with a torque limiter 33 at a position where the driving force transmitted to the plurality of input shafts 31 is transmitted to the drive-side sprocket. The torque limiter 33 is provided inside each of the plurality of planting transmission cases 14. The planting transmission case 14 is provided with a transmission chain 34 that transmits the driving force from the drive-side sprocket that receives the driving force from the torque limiter 33 to the driven-side sprocket of the rotary drive shaft 35 at the rear of the planting transmission case 14. The transmission chain 34 is accommodated inside each of the plurality of planting transmission cases 14.

[0071] The planting transmission case 14 is provided with a few-row clutch 36 on each of the plurality of rotary drive shafts 35. The few-row clutch 36 connects / disconnects the driving force transmitted from the transmission chain 34 to the rotary drive shaft 35.

[0072] The planting transmission case 14 is provided with a clutch operation unit that performs a connection / disconnection operation on the driving force transmitted from the drive chain 34 to the rotary drive shaft 35. The clutch operation unit includes a clutch operation shaft 41 and a clutch operation lever 42. The clutch operation shaft 41 operates the few-row clutch 36 and is supported on the upper surface of the planting transmission case 14 in a manner that allows it to move forward and backward. In addition, the clutch operation lever 42 is supported on the side surface of the planting transmission case 14 via an operation shaft 44 serving as a swing fulcrum, and performs a pressing operation on the clutch operation shaft 41. The planting transmission case 14 is provided with two ribs 14a that protrude upward from the upper surface and are arranged in the front-rear direction, and each rib 14a is provided with a hole portion 14b. In addition, the planting transmission case 14 is provided with a rib 14c that protrudes upward from the upper surface and is provided at a position sandwiched between the two ribs 14a, and the rib 14c is provided with a hole portion 14d.

[0073] One end of the operation shaft 44 is provided with a flat washer 44A (an example of a second fixing portion), and the flat washer 44A is provided with an internal thread 44B (an example of a second fixing portion). The clutch operation unit includes a torsion spring 47 and a torsion spring 48. The torsion spring 47 biases the clutch operation shaft 41 toward a non-operating state, which is a state where the clutch operation shaft 41 protrudes upward from the planting transmission case 14. The torsion spring 48 biases the clutch operation lever 42 toward an operating state, which is a state before the clutch operation lever 42 performs a pressing operation on the clutch operation shaft 41 (an operating state that makes the clutch operation shaft 41 in a non-operating state). The operation shaft 44 is supported on the planting transmission case 14 by screwing a bolt 44C with the rib 14c of the planting transmission case 14 and the internal thread 44B of the operation shaft 44. Moreover, the operation shaft 44 supports the torsion spring 48, the clutch operation lever 42, and the torsion spring 47 on the planting transmission case 14 by sequentially inserting through the torsion spring 48, the clutch operation lever 42, and the torsion spring 47. At this time, the torsion spring 48 is held by the flat washer 44A.

[0074] In the non-operating state, the clutch operation shaft 41 protrudes upward, so that the few-row clutch 36 maintains the transmission state. In addition, by pressing the clutch operation shaft 41, the transmission state of the few-row clutch 36 is switched to the cut-off state.

[0075] The end portion of the operation wire 43 is connected to the operation member 42a of the clutch operation lever 42. The same number of operation wires 43 as the planting transmission case 14 are provided, and the front end positions of these operation wires 43 are connected to a manually operated lever or a mechanism that selectively pulls the plurality of operation wires 43 by the driving force of an electric motor.

[0076] According to this structure, by cutting the transmission of the few-row clutches 36 of each of the plurality of planting transmission cases 14, it is possible to stop the planting of seedlings by each of the two planting arms 16 provided in each planting transmission case 14.

[0077] (Chemical spraying device)

[0078] As Figure 3 shown by the double-dot dash line, the riding type transplanter A can mount the chemical spraying device C (an example of the equipment) on the upper side of the planting transmission case 14 of the seedling planting device 5. In the case of this mounting, the lower end of the support rod 45 is supported on the upper surface of the planting transmission case 14. As Figure 4 shown, the support rod 45 for supporting the chemical spraying device C is supported on the rib 14a of the planting transmission case 14.

[0079] Specifically, as Figure 3 、 Figure 4 、 Figure 9 shown, a support plate 46 is fixedly provided at the base end portion of the support rod 45 for supporting the chemical spraying device C. The support plate 46 is in a longitudinal posture and is formed with a through hole 46a. The fixing bolt 56 is inserted through the through hole 46a of the support plate 46 and the hole portion 14b of the rib 14a, and the support plate 46 is fixed to the planting transmission case 14 by tightening the nut 57. Thus, the chemical spraying device C is supported on the planting transmission case 14.

[0080] (Cover)

[0081] The clutch operation portion having the clutch operation shaft 41 and the clutch operation lever 42 is arranged at a height close to the paddy field surface G. Therefore, sometimes mud adheres and the clutch operation portion malfunctions. In order to eliminate such a malfunction, as Figure 3 、 Figure 4 、 Figure 9 shown, a cover 50 covering the clutch operation portion having the clutch operation shaft 41 and the clutch operation lever 42 is provided. It should be noted that in Figure 3 , in order to clarify the structure, the cover 50 is shown in section.

[0082] By covering the clutch operation portion with the cover 50, even when mud splashes during the planting work of the seedling planting device 5, it is possible to suppress mud from adhering to the clutch operation portion and protect the clutch operation portion that performs the connection / disconnection operation of the few-row clutch 36.

[0083] Hereinafter, taking the specific structure of the cover 50 as an embodiment, it will be described with reference to the drawings.

[0084] 〔Embodiment 1〕

[0085] As Figures 3 to 6 shown, the cover 50 in Embodiment 1 is provided on the planting transmission case 14, and the cover 50 is mounted in a state where the chemical spraying device C is already mounted.

[0086] The cover 50 is made of resin and includes an upper wall portion 51, a left side wall portion 52 (an example of a side wall portion), a right side wall portion 53 (an example of a side wall portion), a rear wall portion 54, a front wall portion 55, and a lower wall portion 59. The upper wall portion 51, the left side wall portion 52, the right side wall portion 53, the rear wall portion 54, the front wall portion 55, and the lower wall portion 59 are integrally formed.

[0087] The cover 50 has a bolt insertion through-hole 52A in the form of a through-hole in the left side wall portion 52 and an opening portion 53A in the right side wall portion 53.

[0088] In Embodiment 1, the operating shaft 44 has an external thread 44D (an example of a first fixing portion) at the other end opposite to the end provided with the flat washer 44A. That is, the operating shaft 44 has a flat washer 44A with an internal thread 44B and an external thread 44D with the main body portion 44E interposed therebetween.

[0089] In Embodiment 1, the operating shaft 44 supports the cover 50 and the clutch operating portion together on the transplanting transmission case 14. Specifically, as described above, the operating shaft 44 is supported on the transplanting transmission case 14 by screwing the bolt 44C with the rib 14c of the transplanting transmission case 14 and the internal thread 44B of the operating shaft 44. And the operating shaft 44 supports the clutch operating portion on the transplanting transmission case 14 by inserting the torsion spring 48, the clutch operating lever 42, and the torsion spring 47 therethrough.

[0090] In this state, the cover 50 covers the transplanting transmission case 14 such that the right side wall portion 53 of the cover 50 is along the rib 14c and the flat washer 44A is located in the opening portion 53A of the cover 50, and the external thread 44D of the operating shaft 44 is inserted through the bolt insertion through-hole 52A of the cover 50. And the nut 58 is fastened to the external thread 44D from the outside of the cover 50, whereby the cover 50 and the clutch operating portion are supported together on the transplanting transmission case 14.

[0091] The lower end portions of the right side wall portion 53, the rear wall portion 54, and the front wall portion 55 of the cover 50 fixed to the transplanting transmission case 14 are in contact with or along the upper surface of the transplanting transmission case 14, and the right end portion of the lower wall portion 59 is in contact with or along the left side surface of the transplanting transmission case 14. With such a structure, the cover 50 covers the clutch operating portion having the clutch operating shaft 41 and the clutch operating lever 42, and the inside of the cover 50 houses the clutch operating portion. As a result, even if mud splashes due to traveling during transplanting operation, it is possible to suppress mud from adhering to the clutch operating portion. Therefore, it is possible to protect the clutch operating portion that performs the connection / disconnection operation of the few-row clutch 36 from the influence of mud and the like.

[0092] The cover 50 is integrally formed by die molding. Since the cover 50 has a three-dimensional shape with a hollow portion, in order to be easily and highly accurately molded, the cover 50 is preferably molded in an unfolded state. For example, asFigure 7 As shown, the cover 50 connects the first main body portion 50A and the second main body portion 50B via the connecting portion 61. Specifically, the cover 50 has a right side wall portion 53 as the first main body portion 50A, and has an upper wall portion 51, a left side wall portion 52, a rear wall portion 54, a front wall portion 55, and a lower wall portion 59 as the second main body portion 50B. The cover 50 is integrally formed in a state expanded as follows: the upper wall portion 51 and the right side wall portion 53 are connected by the connecting portion 61, and the right side wall portion 53 is separated from the rear wall portion 54 and the front wall portion 55. When attached to the transplant transmission case 14, as Figure 8 shown, it is bent at the connecting portion 61, and the right side wall portion 53 is connected to the upper wall portion 51, the rear wall portion 54, and the front wall portion 55, whereby the cover 50 is three-dimensionally formed. It should be noted that the first main body portion 50A and the second main body portion 50B may also be configured to be separated at any wall portion.

[0093] By forming the cover 50 in this way, it is possible to easily integrally form it using a mold while allowing the cover 50 to accurately cover the clutch operation portion.

[0094] 〔Embodiment 2〕

[0095] As Figure 9 , Figure 10 shown, the cover 50 in Embodiment 2 is provided on the transplant transmission case 14, and the chemical agent spraying device C is attached in a state where the cover 50 is provided.

[0096] The cover 50 is made of resin and includes an upper wall portion 51, a left side wall portion 52 (an example of a side wall portion), a right side wall portion 53 (an example of a side wall portion), a rear wall portion 54, and a front wall portion 55 (refer to Figure 12 ).

[0097] The upper wall portion 51, the left side wall portion 52, the right side wall portion 53, and the rear wall portion 54 are integrally formed. In contrast, the front wall portion 55 is formed in a posture protruding from the front end of the upper wall portion 51 when the cover 50 is formed, as Figure 10 shown. The front wall portion 55 is formed so that the protruding end can be bent downward.

[0098] Protrusions 55a are formed at both ends in the left-right direction of the front wall portion 55. Engagement recesses 49 for engaging the protrusions 55a are formed at the ends of the left side wall portion 52 and the right side wall portion 53 of the cover 50. Thus, by bending the front wall portion 55 downward, the front wall portion 55 is inserted into the inside of the left side wall portion 52 and the right side wall portion 53, and the protrusions 55a are engaged with the engagement recesses 49. As a result, the position of the front wall portion 55 is fixed.

[0099] As Figure 9As shown, the transplanting transmission case 14 has ribs 14a protruding upward from the upper surface, and the ribs 14a have hole portions 14b. The cover 50 has a pair of bolt insertion through-holes 53a in the right side wall portion 53 in a through-hole shape.

[0100] According to this structure, the support plate 46 is arranged on the inner surface of the right side wall portion 53, and the fixing bolt 56 is inserted through each of the bolt insertion through-hole 53a of the cover 50, the through-hole 46a of the support plate 46, and the hole portion 14b of the rib 14a. By tightening the nut 57, the cover 50 and the support plate 46 are fixed to the transplanting transmission case 14 together. In this way, by connecting and fixing the cover 50 to the transplanting transmission case 14, the upper wall portion 51, the left side wall portion 52, the right side wall portion 53, and the rear wall portion 54 of the cover 50 are arranged at positions covering the clutch operation shaft 41 (clutch operation portion) and the clutch operation lever 42 (clutch operation portion). As a result, even when soil splashes during transplanting work, the soil will not adhere to the clutch operation shaft 41 and the clutch operation lever 42, and thus their smooth operation will be maintained.

[0101] The cover 50 is manufactured by die molding, and the bolt insertion through-hole 53a is formed in the form of a pinched hole by the pinching portion of the die. As Figure 10 shown, the space for arranging the pinching portion of the die is formed as a recess 53b on the inner surface of the right side wall portion 53.

[0102] 〔Another Embodiment〕

[0103] In addition to the above-described embodiments, the present invention can also be configured as follows (for parts having the same functions as those in Embodiment 1 and Embodiment 2, the same numbers and marks as in the embodiments are labeled).

[0104] (a) The support rod 45 for supporting equipment such as the chemical agent spraying device C is fixed to the transplanting transmission case 14. When the cover 50 is attached to the transplanting transmission case 14, sometimes the support rod 45 will overlap with the cover 50, so that the cover 50 or the support rod 45 cannot be attached to the transplanting transmission case 14. Therefore, the cover 50 in the above-described Embodiment 1 and Embodiment 2 can also have an insertion opening 50H. It should be noted that in the following description, the insertion opening 50H provided in the cover 50 of Embodiment 1 is mainly taken as an example for description, but the insertion opening 50H can also be provided in the cover 50 of Embodiment 2.

[0105] For example, the rear wall portion 54 of the cover 50 can have an insertion opening 50H for inserting the base end portion of the support rod 45. The insertion opening 50H is formed by artificially cutting off the area from the lower end to the upper side of the rear wall portion 54.

[0106] That is, as Figure 10As shown, the cover 50 has an opening predetermined area N set in the area from the rear wall portion 54 to the upper wall portion 51. The opening predetermined area N is preset with a first opening area Na, a second opening area Nb, and a third opening area Nc.

[0107] The first opening area Na is formed in the area of the rear wall portion 54 from the lower end of the rear wall portion 54 with a first opening width Wa. The second opening area Nb is formed in the area from the lower end of the rear wall portion 54 to the upper wall portion 51 with a second opening width Wb. The third opening area Nc is formed in the area from the lower end of the rear wall portion 54 to a position closer to the front side than the second opening area Nb in the upper wall portion 51 with the second opening width Wb.

[0108] The wall thicknesses of the respective areas are configured to be different so that these first opening area Na, second opening area Nb, and third opening area Nc can be easily cut by manual operation. As a specific solution, taking the wall thickness of the entire cover 50 as the reference thickness, the wall thickness of the third opening area Nc is thinner than the reference thickness, the wall thickness of the second opening area Nb is thinner than the wall thickness of the third opening area Nc, and the wall thickness of the first opening area Na is thinner than the wall thickness of the second opening area Nb.

[0109] It should be noted that the wall thicknesses of the first opening area Na, second opening area Nb, and third opening area Nc can also be successively thicker than the reference thickness, or the wall thicknesses of the third opening area Nc, second opening area Nb, and first opening area Na can also be successively thicker than the reference thickness. In addition, it can also be that, according to the type of the retrofit fitting (chemical applicator, post-fertilizer, seeder, etc.) of the optionally adopted equipment, the opening area corresponding to the fitting with a high retrofit frequency is any one of the first opening area Na, second opening area Nb, and third opening area Nc, and the wall thickness of the opening area with a high opening frequency is thinner than the wall thicknesses of the other opening areas.

[0110] Figure 9 The cover 50 forms an insertion opening 50H by cutting the first opening area Na, and the base end portion of the support rod 45 is inserted rearward into the insertion opening 50H.

[0111] In order to attach the chemical application device C to the seedling planting device 5, the lower end of the support rod 45 is connected and fixed to the planting transmission case 14. In order to enable this connection and fixation, an insertion opening 50H corresponding to the shape of the lower end of the support rod 45 is formed in the rear wall portion 54 of the cover 50. As a result, the base end of the support rod 45 is supported on the planting transmission case 14 without removing the cover 50, and the chemical application device C is attached together with the cover 50.

[0112] The cover 50 is preset with a plurality of opening predetermined regions N corresponding to the shape of the base end of the support rod 45, and the wall thicknesses of the plurality of opening predetermined regions N are different. Thus, when one of the plurality of opening predetermined regions N is selected to form the insertion opening 50H, the position portion of the cover 50 can be cut according to the wall thickness, thereby forming the insertion opening 50H with the required size.

[0113] (b) As Figure 11 、 Figure 12 shown, in a state where the rib 14a on the upper surface of the transplanting transmission case 14 is connected to the support plate 46, the support rod 45 may be connected to the support plate 46 with a posture set to protrude obliquely rearward and upward.

[0114] In this way, the structure in which the support rod 45 protrudes obliquely rearward and upward has a positional relationship with the region where the support rod 45 is inserted through the upper wall portion 51 of the cover 50. For this reason, the region of the second opening region Nb shown in Figure 10 the cover 50 is cut, whereby the insertion opening 50H is formed in the region from the upper wall portion 51 to the rear wall portion 54.

[0115] In this another embodiment (b), the spraying device having the same structure as the chemical spraying device C described in Embodiment 1 and Embodiment 2 is set as the object to be supported, and the chemical spraying device C is connected to the upper end portion of the support rod 45.

[0116] (c) As Figure 13 、 Figure 14 shown, the support plate 46 may extend upward from the upper surface of the rib 14a connected to the transplanting transmission case 14 to the upper side of the upper wall portion 51 of the cover 50. When the support plate 46 is formed in this way, a plurality of rod-shaped support rods 45 are supported near the upper end of the support plate 46.

[0117] In the structure of this another embodiment (c), the support plate 46 is arranged in a state of being inserted through the upper wall portion 51 from above. For this reason, the region of the second opening region Nb shown in Figure 10 the cover 50 is cut, whereby the insertion opening 50H is formed in the region from the upper wall portion 51 to the rear wall portion 54.

[0118] In the structure of this another embodiment (c), as an example of the equipment, the plurality of support rods 45 can support a splash guard (not shown) for preventing mud splashing different from the chemical spraying device C or the like. Regarding the splash guard, the splash guard is supported in a horizontal posture at the upper ends of the plurality of support rods 45.

[0119] (d) Alternatively, the chemical spraying device C described in Embodiment 1 and Embodiment 2 and the splash guard described in another Embodiment (c) may be supported by the seedling planting device 5. In order to support in this manner, the support plates 46 described in Embodiment 1 and Embodiment 2 and the support plate 46 described in another Embodiment (c) are fixed to the planting transmission case 14 in an overlapping state.

[0120] (e) It may also be set that: minute dot-shaped openings along the opening shape are formed between the opening predetermined regions N or between the opening predetermined region N and other regions of the cover 50. Thus, by applying a pushing force to the required region without tools or using a minimum of tools, the insertion opening 50H can be easily formed.

[0121] (f) In order to insert the lower end of the support rod 45 or the support rod 45 and the support plate 46 into the insertion opening 50H, the insertion opening 50H is formed in a manner that enables such insertion. The insertion opening 50H may also be preset as the opening predetermined region N, or may be formed by cutting the corresponding part of the cover 50 without setting the opening predetermined region N.

[0122] (g) The insertion opening 50H may also be formed in a structure that is only formed in the upper wall portion 51 of the cover 50, or formed in a region from the upper wall portion 51 to the side wall portion. In addition, as Figure 7 、 Figure 8 shown, the insertion opening 50H may be provided in the front wall portion 55 and not in the rear wall portion 54, or provided in both the rear wall portion 54 and the front wall portion 55. The cover 50 of Embodiment 2 may be configured to cover a part of the left side portion of the planting transmission case 14. In this case, the cover 50 will obstruct the operation line 43. By providing the insertion opening 50H in the front wall portion 55, the operation line 43 can be provided in a manner that inserts into the insertion opening 50H.

[0123] (h) It may also be considered to provide the cover 50 without the insertion opening 50H to the planting transmission case 14. By configuring in this way, the clutch operation lever 42 that performs the connection / disconnection operation of the few-row clutch 36 can be protected.

[0124] (i) In Embodiment 2, the structure of the operation shaft 44 of the clutch operation portion is arbitrary. That is, in Embodiment 2, the cover 50 is supported by the rib 14a of the planting transmission case 14 using the fixing bolt 56, and the support of the cover 50 does not use the operation shaft 44. Therefore, the clutch operation portion is supported by an arbitrary operation shaft 44 on the rib 14c of the planting transmission case 14. In addition, as described above, the cover 50 may also be supported by the support rod 45 or the clutch operation portion on the planting transmission case 14, or may be separately supported from the support rod 45 and the clutch operation portion on the planting transmission case 14.

[0125] (j) The cover 50 is not limited to being made of resin and can be made of any material such as metal. Moreover, the cover 50 is not limited to being formed by molding and can be manufactured by any method.

[0126] It should be noted that the structures disclosed in the above embodiments (including another embodiment, the same hereinafter) can be combined and applied with the structures disclosed in other embodiments as long as there is no contradiction. In addition, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto and can be appropriately changed within the scope not departing from the purpose of the present invention.

[0127] Industrial applicability

[0128] The present invention can be used for a riding type rice transplanter having a transplanting transmission case with each row clutch built therein.

[0129] Explanation of reference numerals

[0130] 14: Transplanting transmission case; 14a: Rib; 16: Transplanting arm; 36: Few - row clutch; 44: Operating shaft; 44A: Flat washer (second fixing portion); 44B: Internal thread (second fixing portion); 44C: Bolt; 44D: External thread (first fixing portion); 45: Support rod; 50: Cover; 50A: First main body portion; 50B: Second main body portion; 50H: Insertion opening; 58: Nut; 61: Connection portion; C: Chemical spraying device (equipment); G: Field surface.

Claims

1. A transplanter, characterized in that, Comprising: A plurality of planting arms for planting seedlings on the paddy field surface; A plurality of planting transmission boxes for transmitting driving force to the planting arms; A few-row clutch provided in the planting transmission box for connecting / disconnecting the driving force transmitted to the planting arms; A clutch operation part for connecting / disconnecting the few-row clutch by swinging around an operation shaft; And A cover for covering the clutch operation part.

2. The transplanter according to claim 1, characterized in that The cover is supported on the planting transmission box by the operation shaft.

3. The transplanter according to claim 1 or 2, characterized in that The planting transmission box has ribs for fixing a support rod for supporting the equipment, The ribs are exposed from the cover in a state of covering the clutch operation part.

4. The transplanter according to any one of claims 1 to 3, characterized in that One end of the operation shaft has a first fixing part for supporting the cover, and the other end has a second fixing part. The operation shaft penetrates through the cover in a state of covering the clutch operation part and the clutch operation part. The operation shaft fixes the cover through the first fixing part and is fixed to the planting transmission box through the second fixing part.

5. The transplanter according to claim 4, characterized in that The first fixing part is an external thread, and a nut is used to fix the cover, The second fixing part is a flat washer with an internal thread. In a state of being bolt-fixed to the planting transmission box by screwing a bolt through the planting transmission box and engaging with the internal thread, the clutch operation part is held by the flat washer.

6. The transplanter according to any one of claims 1 to 5, characterized in that The cover has an insertion opening.

7. The transplanter according to claim 6, characterized in that The cover has an upper wall part, left and right side wall parts, and a longitudinal rear wall part. At least one of the left and right side wall parts is connected and fixed to the planting transmission box, The cover is formed of a resin capable of cutting off a preset opening predetermined area in the area from the rear wall part to the upper wall part to form the insertion opening.

8. The transplanter according to claim 7, characterized in that A through-hole-shaped bolt insertion hole for fixing the cover to the planting transmission box is formed in at least one of the pair of left and right side wall parts, When the cover is molded using a mold, a concave part for arranging a clamping part of the mold for forming the bolt insertion hole is formed in the side wall part.

9. The transplanter according to claim 7 or 8, characterized in that The cover further has a front wall part that protrudes from the front end of the upper wall part when the cover is molded, and the protruding end is formed in a posture capable of being bent downward.

10. The transplanter according to any one of claims 7 to 9, characterized in that A plurality of the opening predetermined areas are set on the cover, and the wall thicknesses of the plurality of opening predetermined areas are different.

11. The transplanter according to claim 10, characterized in that The wall thicknesses of the plurality of opening predetermined areas are set to be thinner than the wall thicknesses of other areas of the cover.

12. The transplanter according to any one of claims 1 to 11, characterized in that the cover is made of resin and has: a first main body portion; a second main body portion; and a connecting portion that connects the first main body portion and the second main body portion, the cover covers the clutch operation portion in a state where it is bent at the connecting portion and the first main body portion contacts the second main body portion.

Images