Transplanter

Abstract

To provide a transplanter capable of improving efficiency in supplying seedlings from a preliminary seedling table device to a planting machine.SOLUTION: A transplanter comprises: a transplanting machine for planting seedlings in a farm field; a traveling body that travels with the transplanting machine attached to its rear part; a pair of rear-side preliminary seedling table devices in a machine body width direction provided at the back of the traveling body; and a connection member for connecting the pair of rear-side preliminary seedling table devices together.SELECTED DRAWING: Figure 1C

Description

Technical Field

[0001] The present invention relates to a riding vegetable transplanter for planting vegetable seedlings in a field, for example.

Background Art

[0002] Conventionally, a transplanter disclosed in Patent Document 1 has been known.

[0003] The transplanter disclosed in Patent Document 1 is a riding transplanter including a planting work machine for planting seedlings in a field, a traveling body that travels with the planting work machine mounted rearward, and a driver's seat mounted on the traveling body. A spare seedling table device for placing spare seedlings is provided at the front part of the traveling body to supply seedlings to the planting work machine.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a transplanter, improvement in the efficiency of the seedling supply work from the spare seedling table device to the planting work machine is desired.

[0006] In view of the above problems, an object of the present invention is to provide a transplanter capable of improving the efficiency of seedling supply from a spare seedling table device to a planting work machine.

Means for Solving the Problems

[0007] A transplanter according to an aspect of the present invention includes a planting work machine for planting seedlings in a field, a traveling body that travels with the planting work machine mounted rearward, a pair of rear spare seedling table devices provided at the rear part of the traveling body in the machine width direction, and a connecting member that connects the pair of rear spare seedling table devices to each other.

Advantages of the Invention

[0008] According to the above configuration, in a transplanter with a planting work machine attached to the rear of a traveling body, by providing a rear spare seedling table device at the rear of the traveling body, it is possible to improve the efficiency of supplying seedlings from the spare seedling table device to the planting work machine. Further, by providing a connecting member for connecting the pair of rear spare seedling table devices, the pair of rear spare seedling table devices can reinforce each other and enhance rigidity.

Brief Description of the Drawings

[0009]

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Mode for Carrying Out the Invention

[0010] Hereinafter, an embodiment of the present invention will be described with appropriate reference to the drawings.

[0011] Fig. 1A is a schematic side view showing the overall configuration of the riding vegetable transplanter 1 according to this embodiment. Fig. 1B is a schematic plan view of the riding vegetable transplanter 1. Fig. 1C is a schematic front view of the riding vegetable transplanter 1. As shown in Fig. 1A, the riding vegetable transplanter 1 (hereinafter, appropriately abbreviated as the transplanter 1) is a riding type transplanter having a driver's seat 3 on which an operator (driver, operator, worker, user) 2 sits.

[0012] As shown in FIGS. 1A and 1B, the transplanter 1 has a planting unit 4 for planting seedlings 7 (e.g., vegetable seedlings) in a field 6, and a traveling body 5 that mounts the planting unit 4 and travels. Therefore, the transplanter 1 is a machine that plants the seedlings 7 in the field 6 by the planting unit 4 while traveling through the field 6 by the traveling body 5. That is, the transplanter 1 is a ride-on type vegetable transplanter for planting seedlings 7 (e.g., vegetable seedlings). In the present embodiment, the planting unit 4 is mounted behind the traveling body 5.

[0013] In the embodiment of the present invention, the front direction of the operator 2 seated in the driver's seat 3 of the transplanter 1 (the direction of arrow A1 in FIGS. 1A and 1B) is defined as the front, and the rear direction of the operator 2 (the direction of arrow A2 in FIGS. 1A and 1B) is defined as the rear for explanation. Also, the direction of arrow K1 in FIGS. 1A and 1B is referred to as the longitudinal direction of the machine body. Further, the right side of the operator 2 (the direction of arrow B1 in FIG. 1B) is defined as the right, and the left side of the operator 2 (the direction of arrow B2 in FIG. 1B) is defined as the left for explanation.

[0014] Also, as shown in FIG. 1B, the horizontal direction, which is a direction orthogonal to the longitudinal direction of the machine body (arrow K1 direction), is described as the width direction of the machine body (arrow K2 direction). The direction from the center in the width direction of the machine body 16 toward the right or the left is described as the outside in the width direction of the machine body. In other words, the outside in the width direction of the machine body means the direction in the width direction K2 that is away from the center in the width direction of the machine body 16. The direction opposite to the outside in the width direction of the machine body is described as the inside in the width direction of the machine body. In other words, the inside in the width direction of the machine body means the direction in the width direction K2 that approaches the center in the width direction of the machine body 16.

[0015] First, an overview of the planting unit 4 will be described. As shown in FIG. 1A, the planting unit 4 has a seedling placing table 9 on which a plurality of seedling trays (cell trays) 8 having a large number of seedlings 7 are placed (the seedling trays 8 are placed). As shown in FIG. 1B, in the present embodiment, a plurality of seedling placing tables 9 are provided. The plurality of seedling placing tables 9 are arranged side by side in the width direction K2 of the machine body. The number of seedling placing tables 9 is two in the present embodiment, but may be three or more. Also, the number of seedling placing tables 9 may be one.

[0016] As shown in Fig. 3, the seedling tray 8 is made of plastic, formed thinly and has flexibility, and is formed in a rectangular shape in plan view. The seedling tray 8 has a large number of pot portions 8a arranged in a grid pattern at a predetermined pitch in the vertical and horizontal directions. The opening edge portions of the pot portions 8a are connected by a flat upper surface wall 8b. The pot portions 8a project from the upper surface wall 8b toward the back side (downward). In the seedling tray 8, seedlings 7 (soil block seedlings) are grown by supplying floor soil to the pot portions 8a, sowing seeds in the floor soil, and raising seedlings (see Fig. 1A).

[0017] As shown in Fig. 4, the seedling placing table 9 has a placing plate 10 on which the seedling tray 8 is placed in a state of being inclined downward (inclined in a direction of shifting rearward as it goes downward). As shown in Fig. 1A, the seedlings 7 in the seedling tray 8 are taken out one by one by a seedling taking-out device 11 arranged at the lower rear of the seedling placing table 9 and supplied to the lower planting body 12. The planting body 12 reciprocates up and down and receives the seedlings 7 at the top dead center position. Also, when the planting body 12 descends, it penetrates into the field 6 and plants the seedlings 7. Specifically, the planting body 12 is formed of an opener that can open and close back and forth. When in the closed state, it holds the seedlings 7 inside and moves downward. When it penetrates into the field 6, it opens back and forth to form a planting hole in the field 6 and drops the seedlings 7 into the planting hole for planting. The planting work machine 4 has a pair of soil covering rings 62 that roll on the field 6 to press the soil on both sides (left side and right side) in the machine width direction K2 of the seedlings 7 dropped into the planting holes from the planting body 12. By rolling of this pair of soil covering rings 62 on the field, the soil is heaped up at the plant rows of the seedlings 7 and the plant rows are compacted. The planting work machine 4 takes out the seedlings 7 from the seedling tray 8 and automatically plants them in the field 6 at a predetermined interval.

[0018] The planting body 12, the seedling taking-out device 11, and the pair of soil covering rings 62 are components for planting the vegetable seedlings 7. One or more planting units including these components (the seedling taking-out device 11, the planting body 12, the pair of soil covering rings 62) are provided according to the number of the seedling placing tables 9. When there are a plurality of planting units, they are arranged side by side in the machine width direction K2 corresponding to the seedling placing tables 9.

[0019] As shown in Fig. 4, the placement plate 10 can place a plurality of seedling trays 8 vertically side by side along the inclined direction. The seedling trays 8 are arranged with their longitudinal directions aligned with the inclined direction. The seedling extraction device 11 extracts seedlings 7 from the lowermost seedling tray 8 (8A) among the plurality of seedling trays 8 placed on the placement plate 10. Also, while the seedling placement table 9 is intermittently laterally fed by one pitch of the pot part 8a in the machine body width direction K2, the seedling extraction device 11 extracts the seedlings 7 from the seedling tray 8 one by one. When a horizontal row of seedlings 7 is extracted from the seedling tray 8, the seedling tray 8 is vertically fed downward by one pitch of the pot part 8a along the inclined direction. Thereby, the next horizontal row of seedlings 7 can be extracted. After that, the seedling placement table 9 is laterally fed in the direction opposite to the previous one to extract the seedlings 7, and when a horizontal row of seedlings 7 is extracted, the seedling tray 8 is vertically fed. By sequentially repeating this, all the seedlings 7 are extracted from the seedling tray 8.

[0020] As shown in Fig. 4, the seedling placement table 9 has an inversion guide 13 at the lower part, and the seedling tray 8 after the seedlings 7 are extracted by the seedling extraction device 11 is sent to the inversion guide 13 by being vertically fed. The seedling tray 8 sent to the inversion guide 13 is guided by the inversion guide 13 and guided to the back side (lower surface side) 10A of the placement plate 10. Also, the seedling placement table 9 has an empty tray guide 14 on the back side of the placement plate 10. The empty tray guide 14 has a curved part 14a at the lower part. The curved part 14a receives the seedling tray 8 from the inversion guide 13 and guides it to a guide main body part 14b arranged on the back side of the placement plate 10. The empty seedling tray 8 is guided to the upper part of the back surface of the placement plate 10 by the guide main body part 14b. The empty tray guide 14 has an upper guide part 14c at the upper part. The upper guide part 14c extends forward from the upper end of the guide main body part 14b toward the driver's seat 3 side. The empty seedling tray 8 can be taken out from the upper guide part 14c.

[0021] Next, the traveling body 5 will be described in detail. As shown in Fig. 1A, the traveling body 5 is arranged in front of the planting work machine 4. As shown in Fig. 5, the traveling body 5 includes a machine body 16 on which a driver's seat 3 is mounted, and a traveling device 17 that supports the machine body 16 so as to be able to travel.

[0022] The body 16 has a prime mover 18, a prime mover frame 19, a transmission case 20, and a body frame 21. The prime mover 18 is, for example, a diesel engine. The prime mover 18 is disposed at the front part of the traveling body 5. The prime mover frame 19 is disposed below the prime mover 18 and supports the prime mover 18. The transmission case 20 is disposed behind the prime mover 18 and houses a speed change mechanism that changes the power output from the prime mover 18. The prime mover frame 19 is connected to the front part of the transmission case 20. The body frame 21 is disposed behind the transmission case 20. In other words, the body frame 21 is disposed at the rear part of the traveling body 5. The transmission case 20 is connected to the front part of the body frame 21. The body frame 21 has a support 22 at the rear part. The driver's seat 3 is attached to the support 22 via a seat attachment member 31.

[0023] The driver's seat 3 is disposed at the rear part of the body 16 (mounted on the rear part of the traveling body 5). The driver's seat 3 has a seat part 3A and a backrest part 3B. The seat part 3A is the part where the operator 2 sits (places the buttocks and thighs). The backrest part 3B is the part where the seated operator 2 leans the back, and is provided so as to extend upward from the rear part of the seat part 3A.

[0024] As shown in FIGS. 1A and 1B, in this embodiment, the traveling device 17 is a wheel-type traveling device having a pair of (left and right) front wheels 23 and a pair of (left and right) rear wheels 24 in the body width direction K2. The front wheels 23 and the rear wheels 24 rotate when the power output from the transmission case 20 is transmitted thereto.

[0025] As shown in FIGS. 1A and 1B, in front of the driver's seat 3, a steering wheel 25 for steering the traveling body 5 (front wheels 23), a bonnet 26, and a steering column 27 are provided. A fuel tank or the like is housed in the bonnet 26. The prime mover 18 is disposed below the bonnet 26. The steering column 27 covers a handle post or the like that supports the steering wheel 25.

[0026] The driver's seat 3, the steering wheel 25, and the operating members such as the operation levers provided around the steering wheel 25 and the driver's seat 3 constitute the driving unit 501.

[0027] As shown in FIGS. 5, 6, and 7, the traveling body 5 has a floor seat 29 disposed below the driver's seat 3. The floor seat 29 has, at the front, a floor step 29a that constitutes the floor surface of the driving unit 501. The floor step 29a is disposed in front of and below the driver's seat 3. The floor step 29a has a main step portion 29a1 on which the operator 2 seated on the driver's seat 3 places his / her feet, and front step portions 29a2 on both sides in the machine width direction K2 of the bonnet 26. The main step portion 29a1 serves as a walk-through passage in the machine width direction K2.

[0028] Below the floor step 29a, a transmission case 20 is disposed. Behind the main step portion 29a1 and below the driver's seat 3, a seat base cover 30 is provided to cover a portion 22A (see FIG. 5) of the support 22 where the driver's seat 3 is supported.

[0029] A rear portion 32 of the floor seat 29 is provided at a position higher than the floor step 29a and is provided behind the seat base cover 30. Specifically, the rear portion 32 protrudes rearward from the lower end of the rear portion of the seat base cover 30. Also, the left portion of the rear portion 32 protrudes leftward of the seat base cover 30, and the right portion protrudes rightward of the seat base cover 30. The left and right portions of the rear portion 32 are connected to the floor step 29a by inclined portions 29b. The inclined portions 29b extend in an inclined direction that shifts upward as it goes rearward from the rear portion of the floor step 29a.

[0030] As shown in FIGS. 6 and 7, the traveling body 5 has side steps 507 provided so as to project outward in the machine width direction from the floor step 29a. In the present embodiment, the side steps 507 are provided on the left and right sides of the floor step 29a. That is, the traveling body 5 has one side step 507L provided so as to project outward in one side (left side) in the machine width direction K2 from the floor step 29a, and the other side step 507R provided so as to project outward in the other side (right side) in the machine width direction K2 from the floor step 29a. Note that the side step 507 may be either one of the one side step 507L and the other side step 507R.

[0031] The one side step 507L and the other side step 507R are provided so as to project above the front wheels 23 from the floor step 29a. The one side step 507L and the other side step 507R are provided at substantially the same height position as the floor step 29a. The one side step 507L and the other side step 507R have a rear part 507a located on the side of the driver's seat 3.

[0032] As shown in FIG. 7, the traveling body 5 has a rear step 33 provided between the floor step 29a and the planting work machine 4. Specifically, the rear step 33 is provided between the driver's seat 3 and the planting work machine 4. In other words, the rear step 33 is provided between the driver's seat 3 and the seedling placing table 9 in the side view shown in FIG. 4. Further, the rear step 33 is provided at a position higher than the floor step 29a and the side step 507. Also, the rear step 33 is provided at a position lower than the driver's seat 3.

[0033] The rear step 33 has a main part 33A, a part 33L on one side, and a part 33R on the other side. The main part 33A is disposed behind the driver's seat 3 and in front of the seedling placing table (left and right seedling placing tables) 9, and extends in the machine width direction K2.

[0034] The part 33L on one side is provided on one side (the left side) in the machine width direction K2 of the main part 33A. Specifically, the rear part of the part 33L on one side is provided to protrude outward in the machine width direction from the left part of the main part 33A, and the front part of the part 33L on one side extends forward from the rear part of the part 33L on one side. Also, the part 33L on one side is provided so as to protrude outward in the machine width direction from above the rear wheel 24 on one side (the left side) and outside the rear wheel 24 on the same side. The part 33L (rear step 33) on one side is provided to protrude outward in the machine width direction from the seedling mounting table 9. Specifically, the part 33L on one side is provided to protrude outward in the machine width direction from the seedling mounting table 9 on one side (the left side). Also, the part 33L on one side is arranged behind one side step 507L.

[0035] The part 33R on the other side is provided on the other side (the right side) in the machine width direction K2 of the main part 33A. Specifically, the rear part of the part 33R on the other side is provided to protrude outward in the machine width direction from the right part of the main part 33A, and the front part of the part 33R on the other side extends forward from the rear part of the part 33R on the other side. Also, the part 33R on the other side is provided so as to protrude outward in the machine width direction from above the rear wheel 24 on the other side (the right side) and outside the rear wheel 24 on the same side. The part 33R (rear step 33) on the other side is provided to protrude outward in the machine width direction from the seedling mounting table 9. Specifically, the part 33R on the other side is provided to protrude outward in the machine width direction from the seedling mounting table 9 on the other side (the right side). Also, the part 33R on the other side is arranged behind the other side step 507R.

[0036] As shown in FIG. 7, the rear step 33 protrudes outward in the machine width direction from the seedling mounting table 9. Specifically, the part 33L on one side of the rear step 33 protrudes outward in the machine width direction from the seedling mounting table 9 on one side (the left side) in the machine width direction K2 among the plurality of seedling mounting tables 9. The part 33R on the other side of the rear step 33 protrudes outward in the machine width direction from the seedling mounting table 9 on the other side (the right side) in the machine width direction K2 among the plurality of seedling mounting tables 9.

[0037] Since the rear step 33 is disposed in front of the seedling mounting table 9, when the operator 2 supplies (replenishes) the seedling tray 8 (seedlings 7) to the seedling mounting table 9, the operator 2 can catch a foot on the rear step 33, and by catching a foot on the rear step 33, the replenishment of the seedling tray 8 can be easily performed. Further, since the rear step 33 is provided so as to protrude outward in the machine width direction from the seedling mounting table, that is, since the width of the rear step 33 in the machine width direction K2 is wide, the workability when the operator 2 performs a seedling tray replenishment operation of replenishing the seedling tray 8 to the seedling mounting table 9 while getting on the rear step 33 (from the side of the rear step 33) can be improved.

[0038] A step member 508 is provided behind the side step 507. The step member 508 is provided behind each of one side step 507L and the other side step 507R. The step member 508 is behind and above the side step 507 and is disposed on the side of the driver's seat 3. Specifically, one (left) step member 508 is behind and above one side step 507L and is disposed on the left side of the driver's seat 3. The other (right) step member 508 is behind and above the other side step 507R and is disposed on the right side of the driver's seat 3.

[0039] One step member 508 is higher than one side step 507L and is disposed at substantially the same height position as a part 33L on one side of the rear step 33. The other step member 508 is higher than the other side step 507R and is disposed at substantially the same height position as a part 33R on the other side of the rear step 33.

[0040] The step member 508 is provided on a path from the side step 507 to the rear step 33. Specifically, one step member 508 is provided between one side step 507L and a part 33L on one side of the rear step 33. The other step member 508 is provided between the other side step 507R and a part 33R on the other side of the rear step 33.

[0041] Now, as shown in FIGS. 1A to 1C, at the front and rear of the traveling body 5, there are respectively arranged spare seedling table devices 28 (front spare seedling table device 28F, rear spare seedling table device 28K) on which seedling trays 8 having seedlings 7 (spare seedlings 7 (spare seedling trays 8)) are placed. The operator 2 can take out the seedling trays 8 from the front spare seedling table device 28F and the rear spare seedling table device 28K and supply (replenish) them to the planting work machine 4 (seedling placing table 9).

[0042] Conventionally, the transplanter 1 is only provided with the front spare seedling table device 28F. However, in the present embodiment, by providing the rear spare seedling table device 28K in addition to the front spare seedling table device 28F, the number of spare seedlings 7 that can be mounted on the transplanter 1 can be increased, and the working efficiency of the planting work of the seedlings 7 can be improved.

[0043] In the present embodiment, the front spare seedling table device 28F and the rear spare seedling table device 28K are provided on both sides in the machine width direction K2 of the traveling body 5. However, the present invention is not limited to this. As long as at least one front spare seedling table device 28F and at least one rear spare seedling table device 28K are provided respectively.

[0044] The front spare seedling table device 28F is provided on the end side in the machine width direction K2 at the front of the traveling body 5. Specifically, the front spare seedling table device 28F is arranged on the side of the bonnet 26 (in the present embodiment, the left side and the right side).

[0045] Each of the left and right front spare seedling table devices 28F has a spare seedling table 28A for placing the seedling tray 8 (spare seedling tray 8) and a frame member 28B to which the spare seedling table 28A is attached. As shown in FIGS. 1A and 1C, a plurality of stages (for example, six stages) of the spare seedling table 28A are attached to the frame member 28B in the vertical direction. As shown in FIG. 8, the base end portion of the spare seedling table 28A is rotatably attached to the frame member 28B around an axis extending in the longitudinal direction K1 of the machine body, and can be changed between a use posture UP1 (see the right figure in FIG. 8) in which the seedling tray 8 is placed and a folded posture UP2 (see the left figure in FIG. 8) which is a posture raised from the use posture UP1. Specifically, as shown in FIG. 8, in the use posture UP1, the tip portion of the spare seedling table 28A opposite to the base end portion is positioned in the width direction of the traveling body 5, so that the spare seedling tray 8 can be placed. Also, as shown in FIG. 8, in the folded posture UP2, the tip portion of the spare seedling table 28A is in an upright posture raised so as to approach the frame member 28B, so that the spare seedling tray 8 cannot be placed.

[0046] The frame member 28B is provided upright on both sides in the machine body width direction K2 at the front part of the traveling body 5, for example, on the left side and the right side of the bonnet 26. The frame member 28B is provided on the end side in the machine body width direction K2 of the traveling body 5. Also, the frame member 28B extends upward from the lower part of the traveling body 5 to a position higher than the driver's seat 3. The frame member 28B is configured in a portal shape having a front support member 28B1 and a rear support member 28B2 arranged at intervals in the longitudinal direction K1 of the machine body, and an upper connection portion 28B3 connecting the upper part of the front support member 28B1 and the upper part of the rear support member 28B2.

[0047] As shown in FIGS. 1A and 1B, each of the left and right rear spare seedling table devices 28K is provided behind the front spare seedling table device 28F on the same side in the machine width direction K2. Further, the rear spare seedling table device 28K is provided on the end side in the machine width direction K2 at the rear part of the traveling body 5. Specifically, as shown in FIG. 1B, the rear step 33 protrudes outward in the machine width direction from the seedling mounting table 9, and the rear spare seedling table device 28K is arranged on the outer end side in the machine width direction K2 of the protruding part (one side part 33L and the other side part 33R). Thereby, as shown in FIGS. 1B and 1C, the rear spare seedling table device 28K is arranged more outward in the machine width direction than the front spare seedling table device 28F.

[0048] By the way, in the transplanter 1 in which the planting work machine 4 is mounted behind the traveling body 5, when the rear spare seedling table device 28K is provided at the rear part of the traveling body 5, it is conceivable that the rear spare seedling table device 28K may interfere with the seedling supply work when supplying the seedlings 7 to the planting work machine 4. According to the transplanter 1 of the present embodiment, by arranging the rear spare seedling table device 28K more outward in the machine width direction than the front spare seedling table device 28F, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. Specifically, when the operator 2 rides on the rear step 33 and performs the seedling tray supply work of supplying the seedling tray 8 to the seedling mounting table 9 (from the rear step 33 side), since the rear spare seedling table device 28K is on the outer end side in the machine width direction K2 of the rear step 33, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. Also, when the operator stands on the ground behind one side part 33L or the other side part 33R of the rear step 33 and performs the seedling tray supply work, since the rear spare seedling table device 28K is on the outer end side in the machine width direction K2 of the rear step 33, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. Further, since the rear step 33 is in front of the seedling mounting table 9 and protrudes in the machine width direction K2 more than the seedling mounting table 9, a working space is secured behind one side part 33L and the other side part 33R of the rear step 33.

[0049] As shown in Fig. 1C, each of the left and right rear spare seedling table devices 28K has a spare seedling table 28A for placing the seedling tray 8 (spare seedling tray 8) and a frame member 28C to which the spare seedling table 28A is attached. The spare seedling table 28A of the rear spare seedling table device 28K is formed in the same structure as the spare seedling table 28A of the front spare seedling table device 28F. As shown in Fig. 8, the spare seedling table 28A of the rear spare seedling table device 28K is attached to the frame member 28C so as to be changeable between a use posture UP1 and a folded posture UP2, similarly to the spare seedling table 28A of the front spare seedling table device 28F. Also, a plurality of stages (for example, six stages) of the spare seedling tables 28A of the rear spare seedling table device 28K are attached to the frame member 28C side by side in the vertical direction, similarly to the spare seedling table 28A of the front spare seedling table device 28F.

[0050] Since the rear spare seedling table device 28K is arranged outward in the machine body width direction than the front spare seedling table device 28F, as shown in Fig. 1F, the outer end in the machine body width direction of the spare seedling table 28A of the rear spare seedling table device 28K is located outward in the machine body width direction than the outer end in the machine body width direction K2 of the spare seedling table 28A of the front spare seedling table device 28F. Specifically, as shown in Fig. 1F, when the spare seedling tables 28A of the front spare seedling table device 28F and the rear spare seedling table device 28K are in the use posture UP1, the outer end in the machine body width direction K2 of the spare seedling table 28A of the rear spare seedling table device 28K is located outward in the machine body width direction than the outer end in the machine body width direction K2 of the spare seedling table 28A of the front spare seedling table device 28F. As shown in Fig. 1C, when the spare seedling table 28A of the rear spare seedling table device 28K is in the folded posture UP2, it is located inward in the machine body width direction than the outer end in the machine body width direction K2 of the spare seedling table 28A of the front spare seedling table device 28F which is in the use posture UP1.

[0051] As shown in FIGS. 9A and 9B, the frame member 28C is provided upright on both sides in the machine body width direction K2 at the rear part of the traveling body 5, that is, on the left side and the right side of the rear step 33. Further, the frame member 28C is provided on the end side in the machine body width direction K2 of the traveling body 5 (rear step 33). In other words, one (left) frame member 28C (28CL) is arranged on one side (left side) in the machine body width direction K2 from the driver's seat 3, and the other (right) frame member 28C (28CR) is arranged on the other side in the machine body width direction K2 from the driver's seat 3. Further, one frame member 28CL and the other frame member 28CR are arranged behind the seat part 3A of the driver's seat 3 and extend (project) upward from below the traveling body 5 to a position higher than the driver's seat 3.

[0052] As shown in FIG. 9A, the frame member 28C is configured in a portal shape having a front support member 28C1 and a rear support member 28C2 arranged at intervals in the machine body front-rear direction K1, and an upper connection part 28C3 connecting the upper part of the front support member 28C1 and the upper part of the rear support member 28C2.

[0053] As shown in FIG. 9B, the frame member 28C of the rear spare seedling table device 28K is provided on the end side in the machine body width direction K2 at the rear part of the traveling body 5. Specifically, the frame member 28C of the rear spare seedling table device 28K is arranged at the end on the outer side in the machine body width direction of the rear step 33. As shown in FIG. 7, since the rear step 33 protrudes outward in the machine body width direction from the position where the front spare seedling table device 28F is provided at the front part of the traveling body 5, the frame member 28C of the rear spare seedling table device 28K is arranged and provided outward in the machine body width direction from the frame member 28B of the front spare seedling table device 28F.

[0054] As shown in FIGS. 9B and 9C, the frame member 28C (rear spare seedling table device 28K) is attached to the machine body 16 (machine body frame 21) by the attachment structure 500. The transplanter 1 has a left attachment structure 500 for attaching the left frame member 28CL (rear spare seedling table device 28K) to the machine body 16 and a right attachment structure 500 for attaching the right frame member 28CR (rear spare seedling table device 28K) to the machine body 16. Since the left attachment structure 500 and the right attachment structure 500 have the same structure and are configured symmetrically left and right, they will be described together.

[0055] The attachment structure 500 has a first component member 500A, a second component member 500B, and a third component member 500C. The first component member 500A has a first part 500a disposed below the rear step 33 and extending in the machine body width direction K2, and a second part 500b extending upward from the outer end portion of the first part 500a in the machine body width direction K2. The first part 500a of the first component member 500A is attached to the machine body 16 (machine body frame 21) via one or more brackets.

[0056] The second part 500b is located laterally below the lower part of the front support member 28C1. A first bracket member 502 is fixed to the lower part of the front support member 28C1. The first bracket member 502 is attached to the second part 500b of the first component member 500A via bolts or the like. The first bracket member 502 has a front wall 502a fixed to the front side of the front support member 28C1, a rear wall 502b fixed to the rear side of the front support member 28C1, and a side wall 502c connecting the outer end portions of the front wall 502a and the rear wall 502b in the machine body width direction K2.

[0057] The second component member 500B is located on the side of the rear support member 28C2. A second bracket member 503 is fixed to the lower part of the rear support member 28C2. The second bracket member 503 is attached to the second component member 500B via bolts or the like. The second bracket member 503 has a front wall 503a fixed to the front side of the rear support member 28C2, a rear wall 503b fixed to the rear side of the rear support member 28C2, and a side wall 503c connecting the outer ends in the body width direction K2 of the front wall 503a and the rear wall 503b.

[0058] The third component member 500C is disposed between the lower parts of the second part 500b of the first component member 500A and the second component member 500B, and connects the second part 500b and the second component member 500B. Specifically, the front part of the third component member 500C is connected to the first component member 500A by connecting a stay member 504a fixed to the front part of the third component member 500C and a stay member 504b fixed to the lower part of the second part 500b with bolts or the like. The rear part of the third component member 500C is fixed to the lower part of the second component member 500B. Also, a stay member 505a is fixed to the middle part of the third component member 500C in the body front-rear direction K1. This stay member 505a is connected to a stay member 505b fixed to the rear step 33 with bolts or the like.

[0059] As shown in FIGS. 9A and 9B, the frame member 28C of the rear spare seedling table device 28K on one side (left side) and the frame member 28C of the rear spare seedling table device 28K on the other side (right side) are connected by a connecting member 506. Therefore, the connecting member 506 connects the pair of rear spare seedling table devices 28K (the rear spare seedling table device 28K on the left side and the rear spare seedling table device 28K on the right side).

[0060] The connecting member 506 is formed of a bar and extends in the machine width direction K2 across the rear support member 28C2 of the left rear spare seedling table device 28K and the rear support member 28C2 of the right rear spare seedling table device 28K. Brackets 543 connected to the rear support member 28C2 by bolts or the like are fixed to one longitudinal end and the other longitudinal end of the connecting member 506. Further, the connecting member 506 connects the middle portions in the vertical direction of a pair of rear spare seedling table devices 28K (the left frame member 28CL and the right frame member 28CR). Further, as shown in FIG. 9B, the connecting member 506 is disposed at a height position near the upper end of the backrest portion 3B of the driver's seat 3. By providing the connecting member 506 that connects the pair of rear spare seedling table devices 28K to each other, the pair of rear spare seedling table devices 28K can reinforce each other and enhance rigidity.

[0061] As shown in FIG. 7, the connecting member 506 is disposed in front of the seedling placing table 9. Further, as shown in FIG. 9B, the connecting member 506 is disposed at a height position near the upper end of the driver's seat 3. Further, as shown in FIG. 4, the upper end of the seedling placing table 9 is located near the upper end of the driver's seat 3 and slightly below the upper end of the driver's seat 3. Therefore, the connecting member 506 is located in front of the seedling placing table 9 and near the upper end of the seedling placing table 9. Thereby, when replenishing the seedling tray 8 from the rear step 33 side to the seedling placing table 9, the connecting member 506 can function as a support member that supports the operator, and the working posture of the operator can be stabilized. Further, the connecting member 506 can function as a gripping member when the operator moves the rear step 33 or the like when replenishing the seedling tray 8 from the rear step 33 side to the seedling placing table 9.

[0062] As shown in FIGS. 6, 7, 10A, and 10B, an empty tray placing device 509 for placing the empty seedling tray 8 after the seedlings 7 have been taken out is provided on the side of the driver's seat 3. In the present embodiment, the empty tray placing device 509 is provided on the left side of the driver's seat 3, but the empty tray placing device 509 may be provided on the right side of the driver's seat 3. Further, the empty tray placing device 509 may be provided on both the left side and the right side of the driver's seat 3.

[0063] As shown in FIG. 11A, the empty tray placement device 509 includes an empty tray placement member 510 for placing the empty seedling tray 8, a pressing member 511 for pressing the empty seedling tray 8 placed on the empty tray placement member 510, a support member 512 for supporting the pressing member 511 so as to be movable in the vertical direction, and a biasing member 513 for biasing the pressing member 511 downward.

[0064] The empty tray placement member 510 is disposed on the side of the driver's seat 3. Further, the empty tray placement member 510 is disposed at a position where the operator 2 can place the empty seedling tray 8 from the driver's seat 3 (by the operator 2 seated on the driver's seat 3). Also, as shown in FIGS. 7, 10, and 10B, the empty tray placement member 510 is disposed above the rear portion 507a of the side step 507. In the present embodiment, the empty tray placement member 510 is disposed above the rear portion 507a and the step member 508.

[0065] As shown in FIG. 10A, the empty tray placement member 510 has a placement member main body 514 for placing the empty seedling tray 8. As shown in FIGS. 11A and 11B, the placement member main body 514 is formed of a bar material. The placement member main body 514 is formed in a rectangular shape that is long in the machine width direction K2 in plan view. Specifically, the placement member main body 514 includes a pair of first bar portions 514a that are disposed opposite to each other at intervals in the machine front-rear direction K1, and a pair of second bar portions 514b that connect the left and right end portions of the pair of first bar portions 514a.

[0066] As shown in FIG. 11A, the empty tray placement member 510 has a support bar 515 for supporting the placement member main body 514. The support bar 515 extends in the front-rear direction and is disposed below the central portion of the placement member main body 514 in the machine width direction K2. The front end portion of the support bar 515 is fixed to the front first bar portion 514a, and the middle portion is fixed to the rear first bar portion 514a. The support bar 515 protrudes rearward from the placement member main body 514. The support bar 515 penetrates the lower portion of the front support member 28C1 of the frame member 28C (see FIG. 11G).

[0067] As shown in FIGS. 11C and 11D, when the empty seedling tray 8 is placed on the placement member body 514, the first rod portion 514a and the second rod portion 514b are formed so as to fit between the pot portions 8a of the seedling tray 8. Further, when the empty seedling tray 8 is placed on the placement member body 514, the support rod 515 is provided so as to fit between the pot portions 8a.

[0068] As shown in FIGS. 11E and 11G, the empty tray placement member 510 has a rotation prevention structure 516 for preventing rotation around the axis of the support rod 515. The rotation prevention structure 516 has a cylindrical member 516A, an engagement member 516B, and a fixing member (bolt) 516C. The support rod 515 passes through the lower part of the front support member 28C1 and protrudes rearward from the front support member 28C1, and the cylindrical member 516A is externally fitted to the protruding portion. The fixing member 516C is screwed into a screw hole 516a formed in the cylindrical member 516A. By rotating the fixing member 516C in the screwing direction, the cylindrical member 516A is fixed to the support rod 515.

[0069] The engagement member 516B is formed of a rod-shaped material and has a first portion 516B1 and a second portion 516B2. The first portion 516B1 is arranged to extend in the vertical direction behind the front support member 28C1, and the lower end is fixed to the cylindrical member 516A. The second portion 516B2 extends forward from the upper part of the first portion 516B1 and passes through an insertion hole 520 formed in the front support member 28C1. Thereby, rotation around the axis of the support rod 515 is prevented.

[0070] As shown in FIG. 11G, the middle part in the vertical direction of the first portion 516B1 is held by a holding member (referred to as the first holding member) 518 attached to the front support member 28C1. The first holding member 518 is formed of an elastic member and is attached to a mounting hole 521b formed in the front support member 28C1 as shown in FIG. 11G. Further, as shown in FIGS. 11F and 11E, the first holding member 518 has a bifurcated portion that holds the first portion 516B1 therebetween.

[0071] The empty tray placement member 510 is located above the rear part 507a and the step member 508 and can be changed between a placement posture E1 (see FIG. 11A) in which an empty seedling tray 8 can be placed and a retracted posture E2 (see the two-dot chain line in FIG. 10B) in which it retracts from above the rear part 507a and the step member 508. By setting it to the retracted posture E2, it is possible to prevent the empty tray placement member 510 from obstructing the passage when an operator (such as the operator 2) passes over the rear part 507a and the step member 508.

[0072] The empty tray placement member 510 can change the position of the placement member main body 514 between the placement posture E1 and the retracted posture E2 by rotating the support rod 515 around its axis. Further, the rotation prevention of the support rod 515 by the rotation prevention structure 516 can be released in order to change the position of the placement member main body 514 between the placement posture E1 and the retracted posture E2.

[0073] To change the empty tray placement member 510 from the placement posture E1 to the retracted posture E2, first, move the support rod 515 backward (see the arrow D1 in FIG. 11G), pull out the second part 516B2 from the insertion hole 520, and detach the first part 516B1 from the first holding member 518 (see the two-dot chain line in FIG. 11G). Thereby, the rotation prevention of the support rod 515 by the rotation prevention structure 516 can be released.

[0074] Next, rotate the placement member main body 514 around the axis of the support rod 515 (see the arrow D2 in FIGS. 10B and 11G). Next, move the placement member main body 514 backward (see the arrow D3 in FIG. 11G) and hold the rear first rod part 514a by a holding member (referred to as the second holding member) 517 attached to the front support member 28C1 (see FIG. 11G). The second holding member 517 is formed of an elastic member and is attached to the attachment hole 521a formed in the front support member 28C1 as shown in FIG. 11G. Further, as shown in FIG. 11F, the second holding member 517 has a bifurcated portion. The first rod part 514a is held by sandwiching it with this bifurcated portion. The placement member main body 514 can be held in the retracted posture E2 by the second holding member 517.

[0075] As shown in FIGS. 11A and 11H, the pressing member 511 has a vertical rod portion 511a extending in the vertical direction, a horizontal rod portion 511b extending forward from the lower end of the vertical rod portion 511a, a grip 511c attached to the upper portion of the vertical rod portion 511a, and a spring receiving member (referred to as the first spring receiving member) 524 fixed to the lower portion of the vertical rod portion 511a.

[0076] As shown in FIG. 11I, the support member 512 has a front wall 512a, a rear wall 512b, a side wall 512c connecting the right ends of the front wall 512a and the rear wall 512b, a front protruding wall 512e protruding rightward from the front portion of the side wall 512c, a rear protruding wall 512f protruding rightward from the rear portion of the side wall 512c, a connecting wall 512g connecting the right ends of the front protruding wall 512e and the rear protruding wall 512f, a connecting plate 512j connecting the upper portions of the left parts of the front wall 512a and the rear wall 512b, and a spring receiving member (referred to as the second spring receiving member) 523 fixed to the lower ends of the front protruding wall 512e, the rear protruding wall 512f, and the connecting wall 512g.

[0077] As shown in FIG. 11A, the support member 512 is arranged so as to sandwich the front support member 28C1 between the lower portion of the front wall 512a and the lower portion of the rear wall 512b. The lower portion of the front wall 512a and the lower portion of the rear wall 512b are attached to the front support member 28C1 by bolts 519. The connecting plate 512j abuts against the front support member 28C1. The front wall 512a is close to the front wall 502a of the first bracket member 502, and the rear wall 512b is close to the rear wall 502b of the first bracket member 502. The connecting plate 512j and the first bracket member 502 can prevent the support member 512 from rotating around the bolt 519.

[0078] As shown in FIG. 11I, a guide groove 512d is formed between the front protruding wall 512e and the rear protruding wall 512f in the side wall 512c. As shown in FIG. 11J, the guide groove 512d is formed from the upper end to the lower portion of the side wall 512c. As shown in FIG. 11I, a locking groove 512h opened upward is formed in the upper portion of the connecting wall 512g.

[0079] As shown in Fig. 11J, a vertical rod portion 511a is inserted between a side wall 512c and a connecting wall 512g so as to be vertically movable. Further, the vertical rod portion 511a passes through a second spring receiving member 523.

[0080] The biasing member 513 is formed of a compression coil spring and is fitted outside the vertical rod portion 511a between a first spring receiving member 524 and a second spring receiving member 523. Therefore, the pressing member 511 is biased downward by the biasing force of the biasing member 513.

[0081] As shown in Fig. 11J, a pin 522 fitted into a guide groove 512d is attached to the vertical rod portion 511a, and the downward movement of the pressing member 511 is restricted when the pin 522 abuts against the lower end of the guide groove 512d.

[0082] As shown in Fig. 11A, the front portion of the cross bar portion 511b of the pressing member 511 is located above the rear first rod portion 514a. When placing the empty seedling tray 8 on the empty tray placing member 510, an operator pulls up the pressing member 511 against the biasing force of the biasing member 513. After placing the empty seedling tray 8 on the empty tray placing member 510, the seedling tray 8 placed on the empty tray placing member 510 can be pressed by bringing the cross bar portion 511b of the pressing member 511 into contact with the seedling tray 8.

[0083] The pressing member 511 can be changed between a pressing posture E3 (see Fig. 11A) in which the cross bar portion 511b presses the empty seedling tray 8 and a tray removal posture E4 (see the two-dot chain line in Figs. 10A and 11H) in which the cross bar portion 511b is moved to a position where the empty seedling tray 8 placed on the empty tray placing member 510 can be freely removed by rotating the vertical rod portion 511a around its axis. By setting the pressing member 511 to the tray removal posture E4, the operation for removing the stacked seedling trays 8 on the empty tray placing member 510 becomes easy. Further, by setting the pressing member 511 to the tray removal posture E4, the pressing member 511 can be retracted from above the step member 508 when the empty tray placing member 510 is not in use (when in the retracted posture E2).

[0084] In addition, when the operator takes out the seedling tray 8 stacked on the empty tray placement member 510, the operator can also take out the stacked seedling trays 8 while pulling up the pressing member 511 and maintaining that state.

[0085] To change the pressing member 511 from the pressing posture E3 to the tray removal posture E4, as shown in Fig. 11J, first, the pressing member 511 is moved upward (see arrow D4) until the pin 522 comes out of the guide groove 512d against the biasing force of the biasing member 513. Next, the pressing member 511 is rotated 180° (see arrow D5) around the axis of the vertical rod portion 511a. Then, the pin 522 is positioned above the locking groove 512h. Next, the pressing member 511 is moved downward (see arrow D6) to fit the pin 522 into the locking groove 512h. Thereby, the pressing member 511 is held in the tray removal posture E4.

[0086] The above-mentioned empty tray placement device 509 is configured to be attached to the right front support member 28C1 as well. That is, it is configured to be used interchangeably on the left and right. When attaching the empty tray placement device 509 to the right side, the direction of the pin 522 is changed.

[0087] Fig. 1D is a running system configuration and control block diagram of the riding type vegetable transplanter 1.

[0088] As shown in FIG. 1D, the transplanter 1 includes a steering device 320. The steering device 320 has a steering wheel 25, a rotating shaft (steering shaft) 25b that rotates as the steering wheel 25 rotates, and an auxiliary mechanism (power steering mechanism) 25c that assists in steering the steering wheel 25. The auxiliary mechanism 25c includes a hydraulic pump 133, a control valve 323 to which the hydraulic oil discharged from the hydraulic pump 133 is supplied, and a steering cylinder 321 that is operated by the control valve 323. The control valve 323 is an electromagnetic valve that operates based on a control signal. The control valve 323 is, for example, a three-position switching valve that can be switched by the movement of a spool or the like. Also, the control valve 323 can be switched by the steering of the steering shaft 25b. The steering cylinder 321 is connected to an arm (knuckle arm) 322 that changes the direction of the front wheels 23.

[0089] Therefore, by operating the steering wheel 25, the switching position and opening degree of the control valve 323 are switched according to the operation of the steering wheel 25, and the piston rod of the steering cylinder 321 moves left or right according to the switching position and opening degree of the control valve 323, whereby the steering direction of the front wheels 23 can be changed. Note that the above-described steering device 320 is an example and is not limited to the above-described configuration.

[0090] As shown in FIG. 1D, the transplanter 1 is provided with a position detection device 330. As shown in FIGS. 1A and 1C, the position detection device 330 is mounted on a connecting frame 420 that connects the upper connecting portion 28B3 of the left frame member 28B and the upper connecting portion 28B3 of the right frame member 28B. The position detection device 330 is a device that detects its own position (positioning information including latitude and longitude) by means of a satellite positioning system. That is, the position detection device 330 includes an antenna unit 400 that receives signals (position of positioning satellites, transmission time, correction information, etc.) transmitted from a plurality of positioning satellites, and a communication antenna 403 (see FIG. 2A) that receives a radio signal including correction information of positioning error from a base station (reference station) capable of receiving signals from the positioning satellites, and a communication device 401 that acquires correction information of positioning error from the radio signal received by the communication antenna 403, and detects the position (latitude, longitude) based on the received satellite positioning information and correction information. Further, the position detection device 330 may have an inertial measurement device such as a gyro sensor or an acceleration sensor, and detect the position corrected by the inertial measurement device as its own position. The position detection device 330 can detect the position (travel position) of the transplanter 1 (traveling body 5).

[0091] As shown in FIG. 1D, the transplanter 1 is provided with a control device 131 that controls the automatic steering of the traveling body 5 based on the satellite positioning information received by the antenna unit 400. The control device 131 is connected to the position detection device 330 and a traveling detection device 341 of the traveling system. Therefore, the control device 131 can acquire the position (travel position) detected by the position detection device 330 and the detection value detected by the traveling detection device 341. The traveling detection device 341 is, for example, a crank sensor, a cam sensor, an engine rotation sensor, an accelerator sensor, a vehicle speed sensor, a steering angle sensor, or the like.

[0092] The control device 131 controls the traveling system in the transplanter 1. The control device 131 controls, for example, the engine speed, the vehicle speed, the steering angle of the steering device 320, etc. based on the detection value detected by the traveling detection device 341. The control device 131 has a steering control unit 131A and a storage device 131B.

[0093] The control device 131 is composed of an electric / electronic circuit, a processor, a memory, etc. The processor is, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit), etc. The storage device 131B is a non-volatile memory, etc., and stores various control programs (such as a steering control program, a setting program), various data, etc. For example, when the aforementioned processor of the control device 131 executes the steering control program stored in the storage device 131B, it functions as the steering control unit 131A.

[0094] The steering control unit 131A (control device 131) can automatically control (autosteering control) the steering of the transplanter 1 (traveling body 5) based on the set reference azimuth. Fig. 1E is a view of the steering column in front of the driver's seat as seen from the driver's seat side. As shown in Figs. 1D and 1E, the transplanter 1 includes a shift lever 350, a steering changeover switch (GS switch) 351, a first switch 352, a second switch 353, a main switch 354, a third switch 355, and a fourth switch 356. The shift lever 350, the steering changeover switch 351, the first switch 352, the second switch 353, the main switch 354, the third switch 355, and the fourth switch 356 are connected to the control device 131.

[0095] The shift lever 350 is operated by the operator 2 for shifting the transmission mechanism. The steering changeover switch 351 is a switch that can be switched ON / OFF by the operator 2. When it is ON, the auto-steering control is enabled, and when it is OFF, the auto-steering control is disabled. The first switch 352 is operated by the operator 2 to set the starting point of the reference azimuth. The second switch 353 is operated by the operator 2 to set the ending point of the reference azimuth. The third switch 355 is a switch that can be switched ON / OFF by the operator 2. When it is ON, when the permission condition for auto-steering is satisfied, the auto-steering control is enabled without operating the steering changeover switch 351. The fourth switch 356 is a switch that can be switched ON / OFF by the operator 2. When it is ON, the inter-row assist function is enabled, and when it is OFF, the inter-row assist function is disabled.

[0096] The main switch 354 is a switch for turning on / off the power supply and turning on / off the prime mover 18. Specifically, the main switch 354 can be switched to any of the positions of start, operation, and stop. When the switch key is inserted into the main switch 354 by the operator 2 and turned to the start position, the prime mover 18 starts, and the power supply of the transplanter 1 is turned on. When the hand is released after the prime mover 18 starts, the switch key returns to the operation position. In the operation position, various electrical devices of the transplanter 1 operate. When the switch key is turned from the operation position to the stop position, the prime mover 18 stops, and the switch key can be inserted and removed.

[0097] As shown in FIG. 1E, the shift lever 350, the steering switch 351, the first switch 352, and the second switch 353 are installed near the driver's seat 3 and can be operated by the operator 2. For example, the steering switch 351 is provided near the grip of the shift lever 350. The first switch 352 is provided on the upper part of the steering column 27 on the right side of the display device 360, and the second switch 353 is provided on the upper part of the steering column 27 on the left side of the display device 360. The main switch 354 is provided on the upper part of the steering column 27 at the front right side.

[0098] In the field 6, when the first switch 352 is operated, the control device 131 uses the position of the transplanter 1 (traveling body 5) (the position of the antenna unit 400 specified based on the satellite positioning information) as the starting point of the reference azimuth and stores this starting point in the storage device 131B. Subsequently, when the transplanter 1 (traveling body 5) advances a certain distance or more by the operation of the operator 2 and the second switch 353 is operated, the control device 131 uses the position of the transplanter 1 (traveling body 5) (the position of the antenna unit 400 specified based on the satellite positioning information) as the ending point of the reference azimuth and stores this ending point in the storage device 131B. Then, the control device 131 stores in the storage device 131B the azimuth of the straight-line route connecting the starting point and the ending point as the reference azimuth.

[0099] When the steering switch 351 is turned on while the automatic steering permission conditions are satisfied, the control device 131 performs automatic steering control to make the transplanter 1 (traveling body 5) travel along the reference azimuth. The automatic steering permission conditions are that the reference azimuth is stored in the storage device 131B (that is, the reference azimuth is set), and the difference between the traveling direction of the transplanter 1 (traveling body 5) and the reference azimuth is within the allowable value.

[0100] When the steering changeover switch 351 is turned on and the auto-steering control becomes effective, the steering control unit 131A sets the switching position and the opening degree of the control valve 323 so that the traveling position of the transplanter 1 (traveling body 5), including the traveling position of the traveling body 5, coincides with the planned traveling route parallel to the reference azimuth, that is, so that the traveling body 5 moves on the planned traveling route parallel to the reference azimuth. In other words, when the steering changeover switch 351 is ON, the control device 131 sets the moving direction and the moving amount of the piston rod of the steering cylinder 321 (the steering direction and the steering angle of the front wheels 23) so that the traveling position of the transplanter 1 coincides with the planned traveling route.

[0101] Specifically, when the auto-steering control is effective, the steering control unit 131A compares the traveling position of the transplanter 1 (traveling body 5) detected by the position detection device 330 with the position indicated by the planned traveling route (planned traveling position). When the traveling position and the planned traveling position coincide, the steering angle and the steering direction of the steering wheel 25 in the steering device 320 (the steering angle and the steering direction of the front wheels 23) are held without being changed (the opening degree and the switching position of the control valve 323 are maintained without being changed).

[0102] On the other hand, when the traveling position and the planned traveling position do not coincide, the steering control unit 131A changes the steering angle and / or the steering direction of the steering wheel 25 in the steering device 320 (changes the opening degree and / or the switching position of the control valve 323) so that the deviation (deviation amount) between the traveling position and the planned traveling position becomes zero.

[0103] In the above-described embodiment, the steering control unit 131A changes the steering angle of the steering device 320 based on the deviation between the traveling position and the planned traveling position in the auto-steering control. However, when the azimuth of the planned traveling route R1 and the azimuth of the traveling direction (traveling direction) of the transplanter 1 (traveling body 5) (vehicle body azimuth) are different, the steering control unit 131A may set the steering angle so that the vehicle body azimuth matches the azimuth of the planned traveling route R. Further, the steering control unit 131A may set the final steering angle in the auto-steering control based on the steering angle obtained based on the deviation (position deviation) and the steering angle obtained based on the azimuth deviation in the auto-steering control. The setting of the steering angle in the auto-steering control in the above-described embodiment is an example and is not limited.

[0104] When the permission condition for auto-steering is satisfied, the control device 131 starts the control of auto-steering based on the satellite positioning information when the steering changeover switch 351 is turned on, and ends the control of auto-steering when the steering changeover switch 351 is turned off. That is, the transplanter 1 can travel the traveling body 5 along the reference azimuth by the auto-steering control by the steering control unit 131A (control device 131) from when the steering changeover switch 351 is turned on until it is turned off.

[0105] On the other hand, when the auto-steering control is invalid, the steering control unit 131A sets the steering direction and steering angle of the front wheels 23, the vehicle speed, etc. based on the operation of the operator 2 (operation of the steering wheel 25 of the operator 2, operation of the accelerator of the operator 2, etc.). In this way, the steering control unit 131A can manually change the direction of the transplanter 1 (traveling body 5).

[0106] As shown in FIGS. 1D and 1E, the transplanter 1 includes a display device 360 and an alarm lamp 362. The display device 360 is disposed at the center of the upper portion of the steering column 27 in front of the driver's seat 3. The alarm lamp 362 is disposed on the right side of the display device 360 of the steering column 27. The operator 2 can visually recognize the display device 360 and the alarm lamp 362 while seated on the driver's seat 3. The display device 360 has, for example, a segment display unit 361. The segment display unit 361 is a segment LCD (Liquid Crystal Display) that displays various information in segment form for a plurality (for example, four) of characters. The segment display unit 361 can display various setting information before the start of automatic steering, various display information related to automatic steering, etc. in segment form. Note that the display device 360 may include a dot matrix display unit (for example, a display unit composed of a liquid crystal panel, a touch panel, etc.) with excellent expressiveness instead of the segment display unit 361. The alarm lamp 362 lights up, blinks, etc. under the control of the control device 131 when there is an abnormality, caution, etc. regarding the transplanter 1. Thus, notification to the operator 2 is made.

[0107] As shown in FIGS. 1A and 1C, an antenna unit 400 for receiving satellite positioning information and a housing 405 accommodating a communication device 401 and a communication antenna 403 are respectively attached to the connecting frame 420.

[0108] Note that although the communication antenna 403 is housed inside the housing 405, it is not limited thereto, and instead of the communication antenna 403, a configuration other than a configuration in which an external communication antenna is housed inside the housing 405 may be used. For example, the communication antenna can also be retrofitted to the connecting frame 420.

[0109] The antenna unit 400 is in a higher positional relationship than components other than the antenna unit 400.

[0110] An antenna unit 400 is attached above the connecting frame 420. Also, a housing 405 and a rearview mirror 430 are attached below the connecting frame 420. The rearview mirror 430 is attached to the left end side of the connecting frame 420.

[0111] Figure 2A is a left side view of an upper portion of the front spare seedling table device of a riding vegetable transplanter. Figure 2B is a plan view of a position detection device attached to the central portion of the connecting frame. Figure 2C is an exploded perspective view of an upper portion of the front spare seedling table device of the riding vegetable transplanter as viewed from the lower left rear. Figure 2D is an exploded perspective view of an upper portion of the front spare seedling table device of the riding vegetable transplanter as viewed from the upper left rear.

[0112] Specifically, as shown in Figure 2A, a bracket 410 is attached to the connecting frame 420. The antenna unit 400 is attached above the bracket 410. The housing 405 is attached below the bracket 410. As shown in Figure 2B, in plan view, the antenna unit 400 and the housing 405 are arranged at overlapping positions via the bracket 410.

[0113] As shown in Figures 2A to 2D, the bracket 410 includes a first bracket 411 to which the housing 405 is attached and fixed to the connecting frame 420, and a second bracket 412 to which the antenna unit 400 is attached.

[0114] As shown in Figures 2C and 2D, screw holes 411a are formed in the first bracket 411. Long holes 412a that are long along the connecting frame 420 are formed in the second bracket 412. The second bracket 412 is screwed to the first bracket 411 by inserting a fastener 413 such as a bolt into the long hole 412a and screwing it into the screw hole 411a.

[0115] The first bracket 411 includes a sandwiching portion 411A that is in a V-shaped shape in a side view fixed to the connecting frame 420, and a mounting plate portion 411B that is rectangular in a plan view to which the housing 405 is attached to the lower surface. For example, the V-shaped sandwiching portion 411A is fixed to the connecting frame 420 in a state of sandwiching the connecting frame 420 by pressing against the connecting frame 420 inside thereof or welding to the connecting frame 420. Note that the sandwiching portion 411A may be fixed to the connecting frame 420 with a fastening component or the like.

[0116] Through holes into which bolts 415 are inserted are formed at the four corners of the mounting plate portion 411B of the first bracket 411. The housing 405 is attached to the lower surface of the mounting plate portion 411B by screwing the bolts 415 inserted into the through holes into female threads 407 formed at the four corners inside the upper surface of the housing 405.

[0117] In FIG. 2C, for reasons of convenience of explanation, a state in which the female threads 407 are screwed into the bolts 415 of the mounting plate portion 411B is illustrated, but note that the female threads 407 are formed at the four corners inside the upper surface of the housing 405.

[0118] As shown in FIGS. 2C and 2D, the second bracket 412 includes a substantially rectangular mounting plate portion 412A with rounded corners, and an L-shaped frame body 412B that is fixed to the lower surface of the mounting plate portion 412A and is long in the lateral width direction of the second bracket 412. Two long holes 412a are formed in the L-shaped frame body 412B side by side in the machine body width direction K2.

[0119] As shown in FIG. 2B, in a plan view, the size of the mounting surface to which the antenna unit 400 is attached of the bracket 410 is larger than that of the antenna unit 400. This mounting surface is the surface whose outer contour is formed by the mounting plate portion 411B of the first bracket 411 and the mounting plate portion 412A of the second bracket 412. Note that, as shown in FIGS. 2B and 2C, the mounting plate portion 412A of the second bracket 412 is larger than the lower surface 400a of the antenna unit 400.

[0120] Also, as shown in FIGS. 2A to 2D, a handle portion 416 that can be gripped by the operator 2 is attached to the mounting plate portion 412A of the second bracket 412. The handle portion 416 is formed of, for example, a resin material. Therefore, there is almost no influence on the antenna unit 400. Note that the handle portion 416 may be made of metal as long as it is located outside the range of the directivity pattern of the antenna unit 400 shown by the two-dot chain line in FIG. 2F described later. The handle portion 416 is gripped by the operator 2 and can be used to change the posture between the standing posture SP (see FIG. 2A) and the storage posture DP (see FIG. 2E) of the antenna unit 400 described later.

[0121] As shown in FIG. 2A, a communication device 401, a communication antenna 403, and a speaker 402 are accommodated in the housing 405. The speaker 402 is attached to the housing 405 in a posture facing the driver's seat 3.

[0122] The housing 405 includes a USB hub (branch device) connected to the control device 131, and the USB hub includes two USB (Universal Serial Bus) ports. When the housing 405 is open, it is possible to connect a USB cable connected to an external device (for example, the mobile terminal 498) held by the operator 2 to the USB port, and charging and data communication with the external device via the USB cable are possible.

[0123] As shown in FIG. 2B, the antenna unit 400 is connected to the control device 131 via a cable CB1. The communication device 401 is connected to the control device 131 via a cable CB2. The cable CB2 has a power supply cable for supplying power to the communication device 401 and a communication cable for data communication between the communication device 401 and the control device 131. The speaker 402 is connected to the audio output circuit of the control device 131 via a cable CB3. The USB port inside the housing 405 is connected to the control device 131 via a cable CB4.

[0124] The housing 405 has a transmission part 405C through which a wireless signal can penetrate into the housing 405. The transmission part 405C is formed of, for example, a transparent or translucent resin material and can be utilized as a viewing window. That is, it is possible to check the lighting state of the lamp display (for example, a power lamp when power is supplied, a communication state lamp indicating the communication state, etc.) of the communication device 401 inside the housing 405 from the outside of the housing 405 through the transmission part 405C (viewing window).

[0125] Note that the housing 405 may be formed of a radio wave transmissive material through which a wireless signal can penetrate. The housing 405 may be formed of, for example, a transparent or translucent resin material. Also, at least a part of the housing 405 may be formed of a transparent or translucent material.

[0126] FIG. 2E is a left side view of an upper part of a preliminary seedling table with the connecting frame in the stored posture DP. The connecting frame 420 is configured to be switchable between the standing posture SP shown in FIG. 2A and the stored posture DP shown in FIG. 2E by rotating around a horizontal axis X3 along the lateral width direction (machine body width direction K2) of the traveling body 5. In the standing posture SP of the connecting frame 420 shown in FIG. 2A, the antenna unit 400 is at a position higher than the upper parts of both frame members 28B and can receive satellite positioning information. In the stored posture DP of the connecting frame 420 shown in FIG. 2E, the antenna unit 400 is lower than in the standing posture SP and is located below the housing 405. Therefore, in the stored posture DP, the antenna unit 400 cannot receive satellite positioning information or the reception state deteriorates significantly.

[0127] When the reception level of the signal indicating the satellite positioning information from the antenna unit 400 is equal to or lower than a specified value and correction information for the positioning error has been acquired by the communication device 401, the control device 131 determines that the connecting frame 420 is in the stored posture DP. For example, when the control device 131 determines that the connecting frame 420 is in the stored posture DP, it can notify the operator 2 by outputting a voice from the speaker 402 stating that "the connecting frame 420 is in the stored posture DP", segment-displaying a character string indicating the same on the display device 360, or causing the warning lamp 362 to emit light.

[0128] Here, a configuration in which the connecting frame 420 can be switched between the standing posture SP shown in FIG. 2A and the stored posture DP shown in FIG. 2E will be described. As shown in FIGS. 2C and 2D, the connecting frame 420 includes a left leg portion 421, a right leg portion 422, and a rod-shaped body 423. The left leg portion 421 has a lower left portion 421A connected to the upper connecting portion 28B3 of the left frame member 28B on the left side of the traveling body 5, and a first extending portion 421B that bends upward and extends from the lower left portion 421A. The right leg portion 422 has a lower right portion 422A connected to the upper connecting portion 28B3 of the right frame member 28B on the right side of the traveling body 5, and a second extending portion 422B that bends upward and extends from the lower right portion 422A. The rod-shaped body 423 is a member that connects the upper ends of the first extending portion 421B and the second extending portion 422B and extends in the lateral width direction (aircraft width direction K2) of the traveling body 5.

[0129] A rotation support body 28B4 that rotatably supports the connecting frame 420 is fixed to the upper portion of the upper connecting portion 28B3 of the frame member 28B. That is, rotation support bodies 28B4 are fixed to each of the left and right frame members 28B.

[0130] The left rotation support body 28B4 includes a pair of support walls 28B41 that extend upward with a slightly larger interval than the lower left portion 421A of the left leg portion 421, a semi-circular protrusion 28B42 that protrudes upward at the center of the pair of support walls 28B41, a through hole formed in the protrusion 28B42, and a fixing pin 28B43 inserted into the through hole formed at the tip of the lower left portion 421A of the left leg portion 421.

[0131] Also, the right rotation support 28B4 includes a pair of support walls 28B41 that extend upward with a slightly larger interval than the lower right part 422A of the right leg part 422, a semi-circular protruding part 28B42 that protrudes upward at the center of the pair of support walls 28B41, a through hole formed in the protruding part 28B42, and a fixing pin 28B43 inserted into the through hole formed at the tip of the lower right part 422A of the right leg part 422.

[0132] Therefore, the connecting frame 420 can be rotated between the standing posture SP shown in FIG. 2A and the storage posture DP shown in FIG. 2E.

[0133] The connecting frame 420 can be fixed in the standing posture SP shown in FIG. 2A and the storage posture DP shown in FIG. 2E, respectively. As shown in FIG. 2A, the left rotation support 28B4 includes a first female screw part 28B61 for screwing the connecting frame 420 in the standing posture SP and a second female screw part 28B62 for screwing the connecting frame 420 in the storage posture DP. In the standing posture SP shown in FIG. 2A, two fixing bolts 28B5 are inserted into the vertical through holes formed in the lower left part 421A of the left leg part 421, and the lower left part 421A of the left leg part 421 is screwed to the first female screw part 28B61 of the left rotation support 28B4 by the two fixing bolts 28B5. Also, two fixing bolts 28B5 are inserted into the vertical through holes formed in the lower right part 422A of the right leg part 422, and the lower right part 422A of the right leg part 422 is screwed to the first female screw part 28B61 of the right rotation support 28B4 by the two fixing bolts 28B5. Thus, the connecting frame 420 is fixed to the frame member 28B in the standing posture SP.

[0134] On the one hand, as shown in Fig. 2D, by removing two fixing bolts 28B5 from the lower left part 421A of the left foot part 421 and two fixing bolts 28B5 from the lower right part 422A of the right foot part 422, the connecting frame 420 becomes rotatable. The operator 2 rotates the connecting frame 420 around the horizontal axis X3 to the storage posture DP shown in Fig. 2E. In the storage posture DP shown in Fig. 2E, the two removed fixing bolts 28B5 are inserted into the vertical through holes in the lower left part 421A of the left foot part 421 and screwed into the second female thread part 28B62 of the left rotating support 28B4. Also, the two removed fixing bolts 28B5 are inserted into the vertical through holes in the lower right part 422A of the right foot part 422 and screwed into the second female thread part 28B62 of the right rotating support 28B4. Thus, the connecting frame 420 is fixed to the frame member 28B in the storage posture DP.

[0135] Fig. 2F shows a partial front view of the riding vegetable transplanter 1.

[0136] The antenna unit 400 has a directivity pattern that widens upward as shown by the two-dot chain line in Fig. 2F. In Figs. 2F and 6B, the upper sides of the two-dot chain line extending obliquely upward to the left and the two-dot chain line extending obliquely upward to the right are the reception ranges of the antenna unit 400. Since the rearview mirror 430 is located outside the range of the directivity pattern of the antenna unit 400 (that is, below the two-dot chain line), the satellite signal is not blocked by the rearview mirror 430. Also, although the rearview mirror 430 is attached to the connecting frame 420 so as to be able to change its posture, no matter what posture state the rearview mirror 430 is in, it is located outside the range of the directivity pattern of the antenna unit 400.

[0137] The rod-shaped body 423 of the connecting frame 420 is located at a position higher than the uppermost preliminary seedling table 28A among the plurality of preliminary seedling tables 28A when the uppermost preliminary seedling table 28A is in the folded posture UP2. That is, the rod-shaped body 423 of the connecting frame 420 is at the position of the third height H3 from the uppermost preliminary seedling table 28A of the front preliminary seedling table device 28F and at the position of the third height H4 from the uppermost preliminary seedling table 28A of the rear preliminary seedling table device 28K. As shown in FIG. 6B, the uppermost preliminary seedling tables 28A of the front preliminary seedling table device 28F and the rear preliminary seedling table device 28K are located outside the range of the directivity pattern in the folded posture UP2.

[0138] Next, the planting work machine 4 will be described in detail.

[0139] As shown in FIGS. 1A and 1B, the planting work machine 4 has a transplanting frame 36. As shown in FIGS. 1B and 14, the transplanting frame 36 has a main frame 37 and a plurality of unit frames 38. The plurality of unit frames 38 includes a first unit frame 38R and a second unit frame 38L.

[0140] As shown in FIG. 12, the main frame 37 has a first frame 39, a second frame 40, a third frame 42, and a fourth frame 48. The first frame 39 is disposed at the front part of the main frame 37. The first frame 39 has a first support column part 39a on the right side, a second support column part 39b on the left side, and a connecting part 39c connecting the upper parts of the first support column part 39a and the second support column part 39b. The first support column part 39a and the second support column part 39b are bent forward at the middle part in the vertical direction.

[0141] The second frame 40 has a first member 40a, a second member 40b, and a plurality of third members 40c. The first member 40a is arranged to extend in the body width direction K2 so as to connect the first support column portion 39a and the second support column portion 39b. The right part of the first member 40a of the second frame 40 protrudes to the right of the first support column portion 39a, and the left part protrudes to the left of the second support column portion 39b. The second member 40b is arranged at a distance below the first member 40a. The plurality of third members 40c are arranged side by side at intervals in the body width direction K2 between the first member 40a and the second member 40b, and connect the first member 40a and the second member 40b.

[0142] The third frame 42 protrudes rearward from the middle part in the vertical direction of the second frame 40. The third frame 42 has a first part 42a, a second part 42b, and a third part 42c. The front part of the first part 42a is connected to the middle part in the vertical direction of the third member 40c whose right end is at the front, and protrudes rearward from the third member 40c. The front part of the second part 42b is connected to the middle part in the vertical direction of the third member 40c whose left end is at the front, and protrudes rearward from the third member 40c. The third part 42c connects the rear parts of the first part 42a and the second part 42b.

[0143] The fourth frame 48 is arranged at approximately the central part in the body width direction K2 of the main frame 37, and connects a member 41 that connects the central pair of third members 40c and the third part 42c of the third frame 42. A fixed plate 53 is provided between the central pair of third members 40c. A rolling shaft 54 (see FIG. 21) is attached to the fixed plate 53 in a forward protruding manner. The rolling shaft 54 has a rolling axis X1 (see FIGS. 21 and 22) that extends in the body front-rear direction K1. The rolling shaft 54 is arranged at approximately the central part in the body width direction K2 of the main frame 37.

[0144] As shown in FIG. 35, a rail member (referred to as the first rail) 56 extending in the machine body width direction K2 is disposed on the rear side of the first member 40a of the second frame 40. The first rail 56 is formed of a channel steel-shaped member and is open rearward. A reinforcing member 559 extending in the machine body front-rear direction K1 is fixed to the front surface of the first rail 56. Above the middle part in the machine body front-rear direction K1 of the third frame 42, a rail member (referred to as the second rail) 58 extending in the machine body width direction K2 is disposed. The second rail 58 is formed of a channel steel-shaped member and is open forward. A reinforcing member 560 extending in the machine body front-rear direction K1 is fixed to the rear surface of the second rail 58. The first rail 56, the reinforcing member 559, the second rail 58, and the reinforcing member 560 are attached to the main frame 37 via a pair of left and right mounting frames 44.

[0145] As shown in FIG. 15, a plurality of connecting plates 61 are provided at the rear part of the main frame 37. The plurality of connecting plates 61 include a first connecting plate 61R and a second connecting plate 61L. The first connecting plate 61R is fixed to the right part of the third part 42c of the third frame 42, and the second connecting plate 61L is fixed to the left part of the third part 42c.

[0146] As shown in FIGS. 1B and 14, the first unit frame 38R is disposed on the right part of the main frame 37, and the second unit frame 38L is disposed on the left part of the main frame 37. Specifically, the first unit frame 38R and the second unit frame 38L are disposed between the first part 42a and the second part 42b of the third frame 42. The first unit frame 38R is disposed on the right side between the first part 42a and the second part 42b, and the second unit frame 38L is disposed on the left side between the first part 42a and the second part 42b. The first connecting plate 61R is disposed behind the first unit frame 38R, and the second connecting plate 61L is disposed behind the second unit frame 38L.

[0147] As shown in FIG. 14, the first unit frame 38R and the second unit frame 38L are respectively provided with a seedling taking-out device 11, a planting body 12, and a soil covering wheel (grounding roller) 62.

[0148] A plurality of seedling taking-out devices 11 are provided, and the plurality of seedling taking-out devices 11 include a first seedling taking-out device 11R provided on the first unit frame 38R and a second seedling taking-out device 11L provided on the second unit frame 38L.

[0149] A plurality of planting bodies 12 are provided, and the plurality of planting bodies 12 include a right planting body 12R provided on the first unit frame 38R and a left planting body 12L provided on the second unit frame 38L. The right planting body 12R constitutes a part of a first planting device 35R (see FIG. 15) for planting the seedling 7 taken out by the first seedling taking-out device 11R in the field 6. The left planting body 12L constitutes a part of a second planting device 35L (see FIG. 15) for planting the seedling 7 taken out by the second seedling taking-out device 11L in the field 6.

[0150] The soil covering wheel 62 includes a first soil covering wheel 62R provided on the first unit frame 38R and a second soil covering wheel 62L provided on the second unit frame 38L. Two first soil covering wheels 62R are provided side by side in the machine body width direction K2. Two second soil covering wheels 62L are also provided side by side in the machine body width direction K2. The first soil covering wheel 62R is arranged behind the right planting body 12R, rolls on the left and right sides of the seedling 7 planted by the right planting body 12R to gather soil at the base of the seedling 7 and compact the base of the plant. The second soil covering wheel 62L is arranged behind the left planting body 12L, rolls on the left and right sides of the seedling 7 planted by the left planting body 12L to gather soil at the base of the seedling 7 and compact the base of the plant.

[0151] As shown in FIG. 15, the first unit frame 38R, the first seedling take-out device 11R, the right planter 12R (first planting device 35R), and the first soil covering wheel 62R constitute the first transplanting unit 63R. The second unit frame 38L, the second seedling take-out device 11L, the left planter 12L (second planting device 35L), and the second soil covering wheel 62L constitute the second transplanting unit 63L.

[0152] There may be one transplanting unit, or three or more. Also, the number of seedling placing tables 9 is determined according to the number of transplanting units.

[0153] As shown in FIGS. 15 and 16, the first unit frame 38R has a frame body 64 that is rectangular in plan view. The frame body 64 includes a first side frame 65A and a second side frame 65B that are arranged opposite to each other with a space therebetween in the machine body width direction, a front frame (referred to as the first front frame 66) that connects the front portions of the first side frame 65A and the second side frame 65B, a rear frame 67 that connects the front portions of the first side frame 65A and the second side frame 65B, and a second front frame 68 that is arranged behind the first front frame 66 and connects the first side frame 65A and the second side frame 65B. The first side frame 65A is arranged outside the machine body of the second side frame 65B.

[0154] The second unit frame 38L also has a frame body 64 having the same configuration as the first unit frame 38R.

[0155] At the front portion of each frame body 64, a first unit bracket 69 and a second unit bracket 70 are provided, which are arranged with a space therebetween in the machine body width direction K2. The first unit bracket 69 and the second unit bracket 70 are fixed to the first front frame 66 and the second front frame 68 at the upper portions and protrude downward from the frame body 64. The first unit bracket 69 is arranged on the outer side of the machine body of the frame body 64, and the second unit bracket 70 is arranged on the inner side of the machine body of the frame body 64.

[0156] As shown in Fig. 15, a drive main shaft 71 is disposed to extend in the machine body width direction K2 at the front portions of a first unit frame 38R (first transplant unit 63R) and a second unit frame 38L (second transplant unit 63L). Further, the drive main shaft 71 is provided to extend in the machine body width direction at the front portion of the main frame 37.

[0157] The front portions of the first unit frame 38R and the second unit frame 38L are movably supported on the drive main shaft 71 in the machine body width direction K2. Specifically, the drive main shaft 71 has an axis extending in the machine body width direction K2 and is provided from the front portion of a first part 42a to the front portion of a second part 42b of the third frame 42. The left side of the drive main shaft 71 is rotatably supported by a first support bracket 59 via a bearing 72, and the right side is rotatably supported by a second support bracket 60 via a bearing 73.

[0158] As shown in Fig. 16, the first unit frame 38R and the second unit frame 38L are disposed above the drive main shaft 71. The drive main shaft 71 passes through the lower portions of a first unit bracket 69 and a second unit bracket 70 of the first unit frame 38R and the second unit frame 38L, and is rotatably supported by bearings 74 provided on the first unit bracket 69 and the second unit bracket 70. Thereby, the front portions of the first unit frame 38R and the second unit frame 38L are movably supported on the drive main shaft 71 in the machine body width direction K2.

[0159] As shown in Figs. 15 and 17, the first unit frame 38R has a first attachment plate 76R attached to a first connection plate 61R, and the second unit frame 38L has a second attachment plate 76L attached to a second connection plate 61L.

[0160] As shown in FIGS. 17 and 18, the first mounting plate 76R is attached to the rear frame 67 of the first unit frame 38R by bolts 77A and nuts 77B so as to be position - adjustable in the machine width direction K2. The second mounting plate 76L is attached to the rear frame 67 of the second unit frame 38L by bolts 77A and nuts 77B so as to be position - adjustable in the machine width direction K2. The first mounting plate 76R is attached to the first connecting plate 61R by bolts 78A and nuts 78B so as to be position - adjustable in the machine width direction K2. The second mounting plate 76L is attached to the second connecting plate 61L by bolts 78A and nuts 78B so as to be position - adjustable in the machine width direction K2. By changing the mounting position of the first mounting plate 76R in the machine width direction K2 with respect to the first connecting plate 61R, the first unit frame 38R can be position - adjusted in the machine width direction K2 with respect to the main frame 37. By changing the mounting position of the second mounting plate 76L in the machine width direction K2 with respect to the second connecting plate 61L, the second unit frame 38L can be position - adjusted in the machine width direction K2 with respect to the main frame 37. That is, the first transplanting unit 63R and the second transplanting unit 63L are each independently supported by the main frame 37 so as to be position - adjustable in the machine width direction K2.

[0161] By adjusting the positions of the first unit frame 38R and the second unit frame 38L in the machine width direction K2, the row spacing W1 (see FIG. 15), which is the interval in the machine width direction K2 between the right planting body 12R and the left planting body 12L (the interval in the machine width direction K2 between the seedlings 7 planted by the right planting body 12R and the seedlings 7 planted by the left planting body 12L), can be adjusted.

[0162] As shown in FIG. 17, indicators 78 are provided on the first mounting plate 76R and the second mounting plate 76L. Strip - spacing display portions 79 are provided on the first connecting plate 61R and the second connecting plate 61L. Numbers representing the strip - spacing W1 are marked on the strip - spacing display portions 79. By aligning the indicator 78 with the numbers on the strip - spacing display portion 79, the adjustment of the strip - spacing W1 can be easily performed.

[0163] As shown in FIG. 16, an input sprocket 83, which is an input member for inputting rotational power to the drive main shaft 71, is provided on the central side of the drive main shaft 71 so as to be integrally rotatable. The input sprocket 83 is supported by a bearing 84, and the bearing 84 is attached to a stay member 85 fixed to the fourth frame 48.

[0164] FIG. 19 shows a side view of a power input unit 86 that inputs power to the drive main shaft 71, and FIG. 20 shows a plan view of a part of the power input unit 86 developed.

[0165] As shown in FIGS. 19 and 20, the power input unit 86 includes an input shaft 87, a gear transmission mechanism 88, and a winding transmission mechanism 89 including an input sprocket 83.

[0166] As shown in FIG. 1A, power is transmitted from a PTO shaft (power take-off shaft) 90 that protrudes rearward from the transmission case 20 to the input shaft 87. Specifically, a first joint shaft 92 is interlockingly connected to the PTO shaft 90 via a planting clutch (intermediate clutch) 91, and a second joint shaft 93 is interlockingly connected to the first joint shaft 92. The second joint shaft 93 is interlockingly connected to the input shaft 87. The planting clutch 91 intermittently transmits the power output from the PTO shaft 90 to the input shaft 87. When the planting clutch 91 is disengaged, the operations of the planting body 12, the seedling take-out device 11, etc. stop, and when connected, the operations of the planting body 12, the seedling take-out device 11, etc. resume. Therefore, the control device 131 can plant the seedlings 7 at a predetermined plant spacing by adjusting the disengagement time of the planting clutch 91.

[0167] As shown in FIGS. 19 and 20, the gear transmission mechanism 88 includes a first bevel gear 88A that is integrally rotatably fitted to the input shaft 87, and a second bevel gear 88B that meshes with the first bevel gear 88A. The winding transmission mechanism 89 includes a first transmission sprocket 94 that is integrally rotatable with the second bevel gear 88B, a second transmission sprocket 95 to which power is transmitted from the first transmission sprocket 94, and a third transmission sprocket 96 to which power is transmitted from the second transmission sprocket 95. Power is transmitted from the third transmission sprocket 96 to the input sprocket 83.

[0168] As shown in FIGS. 1A and 21, the main frame 37 (planting work implement 4) is mounted on the traveling body 5 via the work implement mounting device 123. The work implement mounting device 123 includes a mounting frame 124 for detachably mounting the main frame 37 (planting work implement 4), and a work implement lifting mechanism 125 for lifting and lowering the main frame 37 (planting work implement 4).

[0169] As shown in FIG. 21, the mounting frame 124 has a shaft receiver 128 that rotatably supports the rolling shaft 54 around the rolling axis X1. The main frame 37 is swingable around the rolling axis X1 with respect to the mounting frame 124. The right planting body 12R and the left planting body 12L are arranged side by side in the machine body width direction K2 with the rolling axis X1 interposed therebetween.

[0170] The work implement lifting mechanism 125 includes a connection link mechanism 129 that connects the traveling body 5 and the mounting frame 124, and a lifting drive body (lifting cylinder 130) that drives the planting work implement 4 to move up and down.

[0171] The connection link mechanism 129 is constituted by parallel links, and includes an upper link 129A and a lower link 129B disposed below the upper link 129A. The front portion of the upper link 129A is rotatably connected to the rear portion of the machine body 16 (machine body frame 21) around an axis in the machine body width direction K2. The rear portion of the upper link 129A is rotatably connected to the mounting frame 124 around an axis in the machine body width direction K2. The front portion of the lower link 129B is rotatably connected to the rear portion of the machine body 16 (machine body frame 21) around an axis in the machine body width direction K2. The rear portion of the lower link 129B is rotatably connected to the mounting frame 124 around an axis in the machine body width direction K2. The connection link mechanism 129 enables the planting work implement 4 to move up and down in parallel.

[0172] The lifting drive body is, for example, a lifting cylinder 130 constituted by a hydraulic cylinder. One end side (the bottom side of the cylinder main body 130A) of the lifting cylinder 130 is rotatably connected to the rear part of the machine body 16 (the machine body frame 21) around the axis in the machine body width direction K2. The other end side of the lifting cylinder 130 (the connecting body 130C attached to the tip side of the piston rod 130B) is rotatably connected to the mounting frame 124 around the axis in the machine body width direction K2. One end side of the lifting cylinder 130 is pivotally supported concentrically with the front part of the upper link 129A, and the other end side is pivotally supported concentrically with the rear part of the lower link 129B.

[0173] As shown in FIG. 21, the transplanter 1 includes a control valve 132 for controlling the lifting cylinder 130. The control valve 132 is controlled by a control device 131. The control valve 132 is formed by a solenoid valve and is constituted by, for example, a three-position direction switching valve that can be switched between a neutral position, a raising position, and a lowering position. The control valve 132 is connected to the control device 131 by electrical wiring or the like and is connected to the cylinder main body 451 of the lifting cylinder 130, a hydraulic pump 133, and an oil tank 134 through hydraulic pipelines. When a raising command signal is transmitted from the control device 131 to the control valve 132, the control valve 132 is switched to the raising position, and the hydraulic oil from the hydraulic pump 133 is supplied to the bottom side of the cylinder main body 451, and the lifting cylinder 130 extends and the main frame (the planting work implement 4) rises. Also, when a lowering command signal is transmitted from the control device 131 to the control valve 132, the control valve 132 is switched to the lowering position, and the hydraulic oil is supplied to the rod side of the cylinder main body 451, and the lifting cylinder 130 contracts and the main frame 37 descends.

[0174] Incidentally, the lifting drive body may be constituted by an electric cylinder (electric actuator) or an electric hydraulic cylinder (electric hydraulic actuator). The electric cylinder is a cylinder driven by electricity. For example, it is an actuator that rotates a ball screw around its axis by an electric motor to move a ball screw nut, and advances and retracts a rod by the movement of this ball screw nut. The electric hydraulic cylinder is an actuator that integrates, for example, an electric motor, an oil tank, a hydraulic pump, a valve, a hydraulic cylinder, etc., and is an actuator in which the hydraulic pump rotates and the valve is switched by the rotation of the electric motor to operate the hydraulic cylinder.

[0175] As shown in FIG. 22, the transplanter 1 has a rolling mechanism 135 that swings the planting work implement 4 around the rolling axis X1. The rolling mechanism 135 has a rolling motor 136, a rolling roller 137, and a cable 138. The rolling motor 136 and the rolling roller 137 are provided on the mounting frame 124 (work implement mounting device 123). The rolling motor 136 and the rolling roller 137 are arranged above the rolling shaft 54 and at a position corresponding to the center of the main frame 37 in the machine width direction K2. The rolling roller 137 is arranged above the rolling motor 136. The rolling motor 136 is constituted by an electric motor capable of forward and reverse rotation. Further, the rolling motor 136 is connected to the control device 131. The control device 131 controls the rolling mechanism 135.

[0176] As shown in FIGS. 23 and 24, the power of the rolling motor 136 is transmitted to the rolling roller 137 via a transmission mechanism (gear transmission mechanism) 139. The transmission mechanism 139 has a first gear 139A that is rotationally driven by the power of the rolling motor 136, and a second gear 139B that meshes with the first gear 139A. The second gear 139B has a larger diameter than the first gear 139A and rotates integrally with the rolling roller 137. Therefore, the rolling roller 137 rotates forward and backward by the power of the rolling motor 136.

[0177] The cable body 138 is formed of, for example, a wire or a cable, etc., and is wound around the rolling roller 137. The right side 138R of the cable body 138 extends rightward from the rolling roller 137, and the left side 138L of the cable body 138 extends leftward from the rolling roller 137. The right side 138R of the cable body 138 is connected to the right side in the machine width direction K2 of the planting work machine 4, and the left side 138L of the cable body 138 is connected to the left side in the machine width direction K2 of the planting work machine 4. Specifically, as shown in FIG. 22, the right side 138R of the cable body 138 is connected to one end side of the first buffer spring 140R, and the left side 138L is connected to one end side of the second buffer spring 140L. The other end side of the first buffer spring 140R is hooked on the first spring hanging stay 52R of the main frame 37, and the other end side of the second buffer spring 140L is hooked on the second spring hanging stay 52L. That is, one end side of the cable body 138 is connected to one side in the machine width direction K2 of the main frame 37 via the first buffer spring 140R, and the other end side is connected to the other side in the machine width direction K2 of the main frame 37 via the second buffer spring 140L.

[0178] When the rolling roller 137 is rotated in the forward and reverse single directions by the rolling motor 136, for example, when rotated in the clockwise direction in FIG. 22, the left side of the cable body 138 is pulled. Thereby, the main frame 37 (planting work machine 4) swings in the clockwise direction in FIG. 22 around the rolling axis X1. Further, when the rolling roller 137 is rotated in the forward and reverse other directions (counterclockwise direction in FIG. 22) by the rolling motor 136, the right side of the cable body 138 is pulled. Thereby, the main frame 37 (planting work machine 4) swings in the counterclockwise direction in FIG. 22 around the rolling axis X1. As described above, the main frame 37 (planting work machine 4) is freely swingable around the rolling axis X1.

[0179] As shown in FIG. 23, the mounting frame 124 is provided with a detection sensor 141 for detecting a large swing around the rolling axis X1 of the planting work implement 4. The detection sensor 141 includes a first limit switch 141R for detecting the swing of the planting work implement 4 in the clockwise direction and a second limit switch 141L for detecting the swing of the planting work implement 4 in the counterclockwise direction. One of the multiple teeth of the second gear 139B is a detection tooth 142 that protrudes radially outward of the gear more than the other teeth. When this detection tooth 142 contacts the contact of the first limit switch 141R or the second limit switch 141L, a large swing around the rolling axis X1 of the planting work implement 4 is detected. When the first limit switch 141R or the second limit switch 141L detects the detection tooth 142, for example, the drive of the rolling motor 136 is stopped.

[0180] As shown in FIG. 1B, the planting work implement 4 has a first sensing roller 126R (sensing roller 126) disposed on the front side of the right planter 12R and a second sensing roller 126L (sensing roller 126) disposed in front of the left planter 12L. The first sensing roller 126R is provided on the first unit frame 38R. That is, the first transplanting unit 63R includes the first sensing roller 126R. The second sensing roller 126L is provided on the second unit frame 38L. That is, the second transplanting unit 63L includes the second sensing roller 126L.

[0181] As shown in FIG. 22, the first sensing roller 126R is a member for detecting the height of the first planting surface 144R, which is the planting surface of the field 6 corresponding to the right planter 12R. In other words, the first sensing roller 126R is a member for detecting the height of the first ridge 143R where the seedlings 7 are planted by the right planter 12R.

[0182] The second sensing roller 126L is a member for detecting the height of the second planting surface 144L, which is the planting surface of the field 6 corresponding to the left planter 12L. In other words, the second sensing roller 126L is a member for detecting the height of the second ridge 143L where the seedlings 7 are planted by the left planter 12L.

[0183] The first sensing roller 126R rolls on the first planting surface 144R and moves up and down following the height change of the first planting surface 144R. The second sensing roller 126L rolls on the second planting surface 144L and moves up and down following the height change of the second planting surface 144L.

[0184] As shown in FIG. 25, the first sensing roller 126R is supported by a first roller support mechanism 145R on the first unit frame 38R so as to be swingable up and down. The second sensing roller 126L is supported by a second roller support mechanism 145L on the second unit frame 38L so as to be swingable up and down.

[0185] The first roller support mechanism 145R includes a first roller bracket 146R that supports the first sensing roller 126R so as to be swingable up and down, and a first biasing spring (spring) 147R that biases the first roller bracket 146R downward to press the first sensing roller 126R against the field surface (ground). The first roller bracket 146R has a first arm 148A, a second arm 148B, and a connecting member 148C. The first arm 148A is disposed on the outer side of the machine body of the first sensing roller 126R, and the second arm 148B is disposed on the inner side of the machine body of the first sensing roller 126R. The first arm 148A and the second arm 148B project forward from the first sensing roller 126R. The connecting member 148C connects the first arm 148A and the second arm 148B on the front side of the first sensing roller 126R.

[0186] As shown in FIGS. 25 and 27, a support bracket 149 is provided on the first unit frame 38R. The support bracket 149 has a fixed plate 149A provided across the first unit bracket 69 and the second unit bracket 70, and a mounting plate 149B fixed to the fixed plate 149A. The mounting plate 149B is disposed in front of the first sensing roller 126R. The mounting plate 149B is formed to have a width corresponding to the width of the first sensing roller 126R in the machine width direction K2. Further, the mounting plate 149B has a first side plate portion 149a on the outer end side in the machine width direction K2 and a second side plate portion 149b on the inner end side in the machine width direction K2. The front portions of the first arm 148A and the second arm 148B are pivotally supported by the first side plate portion 149a and the second side plate portion 149b by a pivot 150. The rear portions of the first arm 148A and the second arm 148B are rotatably supported by a roller shaft 151 having an axis along which the first sensing roller 126R extends in the machine width direction K2.

[0187] As shown in FIGS. 25 and 26, the first biasing spring 147R is formed of a compression coil spring and is fitted outside a rod member 152. The lower portion of the rod member 152 is pivotally supported by a rod support shaft 153 fixed to the second arm 148B. The upper portion of the rod member 152 is supported by a support stay 154 fixed to the second side frame 65B of the first unit frame 38R so as to be vertically movable along the axial direction of the rod member 152. The first biasing spring 147R is interposed in a compressed state between a spring receiving plate 155 attached to the rod member 152 and the support stay 154.

[0188] The second roller support mechanism 145L includes a second roller bracket 146L that supports the second sensing roller 126L so as to be vertically swingable, and a second biasing spring (spring) 147L that biases the second roller bracket 146L downward to press the second sensing roller 126L against the field surface (ground). The second roller bracket 146L is configured in the same manner as the first roller bracket 146R. The second roller bracket 146L is supported by the second unit frame 38L by a support bracket 149, and rotatably supports the second sensing roller 126L by a roller shaft 151. The second biasing spring 147L is formed of a compression coil spring and is fitted onto a rod member 152 on the second unit frame 38L side. The rod member 152 is pivotally supported by the second roller bracket 146L and is supported by a support stay 154 fixed to the second side frame 65B of the second unit frame 38L.

[0189] The height (height change) of the first planting surface 144R is detected by the first sensor mechanism 156R for the swing amount of the first roller bracket 146R (the amount of change in the vertical position of the first sensing roller 126R). The height (height change) of the second planting surface 144L is detected by the second sensor mechanism 156L for the swing amount of the second roller bracket 146L (the amount of change in the vertical position of the second sensing roller 126L).

[0190] As shown in FIGS. 25 and 27, the first sensor mechanism 156R includes a first height detection sensor 157R and a first detection arm 159R. The first height detection sensor 157R is formed of a potentiometer. The first height detection sensor 157R is attached to a sensor bracket 158 fixed to the second side plate portion 149b on the side of the first unit frame 38R. The first detection arm 159R has an arm body 160 and a contact 161. The front portion of the arm body 160 is connected to the rotation detector of the first height detection sensor 157R and is rotatable together with the rotation detector. The contact 161 is fixed to the rear portion of the arm body 160. The contact 161 is formed by a pin and abuts on the second arm 148B of the first roller bracket 146R. The arm body 160 can swing vertically concentrically with the first roller bracket 146R. When the first detection arm 159R swings vertically together with the first roller bracket 146R, the first height detection sensor 157R detects the amount of swing of the first roller bracket 146R. Thereby, the height (height change) of the first planting surface 144R can be detected.

[0191] The second sensor mechanism 156L includes a second height detection sensor 157L and a second detection arm 159L. The second height detection sensor 157L is also formed of a potentiometer. The second height detection sensor 157L is attached to a sensor bracket 158 fixed to the second side plate portion 149b on the side of the second unit frame 38L. The second detection arm 159L has an arm body 160 and a contact 161. The front portion of the arm body 160 is connected to the rotation detector of the second height detection sensor 157L and is rotatable together with the rotation detector. The contact 161 is fixed to the rear portion of the arm body 160. The contact 161 is formed by a pin and abuts on the second arm 148B of the second roller bracket 146L. The arm body 160 can swing vertically concentrically with the second roller bracket 146L. When the second detection arm 159L swings vertically together with the second roller bracket 146L, the second height detection sensor 157L detects the amount of swing of the second roller bracket 146L. Thereby, the height (height change) of the second planting surface 144L can be detected.

[0192] As shown in FIGS. 25 and 26, the first roller support mechanism 145R is provided with a scraper 162 for removing mud from the first detection roller 126R. The scraper 162 is attached to a scraper bracket 163. The scraper bracket 163 is provided so as to straddle the first detection roller 126R and is fixed to the first roller bracket 146R. Similarly, the second roller support mechanism 145L is also provided with a scraper 162 for removing mud from the second detection roller 126L.

[0193] As shown in FIG. 22, the first height detection sensor 157R and the second height detection sensor 157L are connected to the control device 131 and transmit the detection values to the control device 131. The control device 131 acquires the detection values detected by the first height detection sensor 157R and the second height detection sensor 157L.

[0194] If there is a height difference between the first planting surface 144R and the second planting surface 144L, the planting depth of the seedlings 7 planted by the right planter 12R and the planting depth of the seedlings 7 planted by the left planter 12L will be different. Therefore, when a height difference occurs between the first planting surface 144R and the second planting surface 144L, in order to make the first height H1, which is the height of the right planter 12R with respect to the first planting surface 144R (planting surface), and the second height H2, which is the height of the left planter 12L with respect to the second planting surface 144L (planting surface), a predetermined height, the planting work machine 4 is swung around the rolling axis X1. Specifically, the control device 131 calculates the height difference between the first height H1 and the second height H2 based on the detection values detected by the first detection roller 126R and the second detection roller 126L, and swings the planting work machine 4 around the rolling axis X1 in a direction to reduce this height difference. In other words, the control device 131 calculates the height difference between the first detection roller 126R and the second detection roller 126L based on the detection values detected by the first detection roller 126R and the second detection roller 126L, and swings the planting work machine 4 around the rolling axis X1 in a direction to reduce the height difference between the first detection roller 126R and the second detection roller 126L.

[0195] More specifically, when the second planting surface 144L is higher than the first planting surface 144R, a height difference occurs between the first sensing roller 126R and the second sensing roller 126L. In this case, the control device 131 swings the planting implement 4 around the rolling axis X1 so that the left side rises and the right side falls. Thereby, basically, the planting depth of the seedlings 7 planted by the right planter 12R and the planting depth of the seedlings 7 planted by the left planter 12L are made the same. Incidentally, when a height difference is provided in advance between the first height H1 and the second height H2 by the angle adjusting unit 194 described later, the planting implement 4 is swung around the rolling axis X1 so as to return to the set height.

[0196] Further, the control device 131 raises and lowers the planting implement 4 based on the unevenness of the planting surface (field 6) detected by one of the first sensing roller 126R or the second sensing roller 126L, and calculates the height difference between the first sensing roller 126R and the second sensing roller 126L with reference to the one sensing roller.

[0197] In the present embodiment, the unevenness of the first planting surface 144R is detected by the first sensing roller 126R, and the planting implement 4 is raised and lowered according to the unevenness of the first planting surface 144R, so that the planting depth of the seedlings 7 in the longitudinal direction of the machine body (arrow K1), that is, in the longitudinal direction of the ridge, is made the same. Specifically, when the planting surface becomes higher, the planting implement 4 is raised, and when the planting surface becomes lower, the planting implement 4 is lowered. Further, the height difference is calculated based on the height of the second sensing roller 126L with respect to the first sensing roller 126R with the first sensing roller 126R as a reference. By calculating the height difference between the first sensing roller 126R and the second sensing roller 126L with reference to one of the first sensing roller 126R or the second sensing roller 126L, the rolling control for swinging the planting implement 4 around the rolling axis X1 can be stably performed.

[0198] Incidentally, the unevenness of the second planting surface 144L may be detected by the second sensing roller 126L, the planting implement 4 may be raised and lowered, and the height difference between the first sensing roller 126R and the second sensing roller 126L may be calculated with the second sensing roller 126L as a reference.

[0199] Further, in the present embodiment, when the height difference between the first sensing roller 126R and the second sensing roller 126L is less than a predetermined value, rolling control by the control device 131 is not performed, and the height difference is absorbed by the free swing around the rolling axis X1 of the planting work machine 4. When the height difference between the first planting surface 144R and the second planting surface 144L becomes equal to or greater than a predetermined value, the control device 131 operates the rolling mechanism 135 to perform rolling control.

[0200] As shown in FIG. 28, swing frames 164 are provided on the first unit frame 38R and the second unit frame 38L so as to be vertically swingable. Since the first unit frame 38R and the second unit frame 38L are fixed to the main frame 37, the swing frame 164 is vertically swingable with respect to the main frame 37 (transplanting frame 36).

[0201] The swing frame 164 provided on the first unit frame 38R is referred to as a first swing frame 164R, and the swing frame 164 provided on the second unit frame 38L is referred to as a second swing frame 164L. Since the first swing frame 164R and the second swing frame 164L are symmetric about the left and right and have the same structure, the first swing frame 164R and the second swing frame 164L will be described together.

[0202] As shown in FIGS. 28 and 29, the swing frame 164 includes a first side frame portion 164A on the outer side of the machine body, a second side frame portion 164B on the inner side of the machine body, an intermediate frame portion 164C connecting the front and rear intermediate portions of the first side frame portion 164A and the second side frame portion 164B, a rear frame portion 164D connecting the rear portions of the first side frame portion 164A and the second side frame portion 164B, a first support portion 164E fixed to the front portion of the first side frame portion 164A by bolts, welding, or the like, and a second support portion 164F fixed to the front portion of the second side frame portion 164B by bolts, welding, or the like.

[0203] The first support part 164E is rotatably supported on the first unit bracket 69 about the horizontal axis (the axis extending in the machine width direction), and the second support part 164F is rotatably supported on the second unit bracket 70 about the horizontal axis. Therefore, the rear part of the swing frame 164 can swing up and down. Specifically, the planting drive shaft 165 is rotatably supported about the horizontal axis across the first unit bracket 69 and the second unit bracket 70, and the first support part 164E and the second support part 164F are rotatably supported on the planting drive shaft 165. A transmission gear 166 is integrally rotatably provided on the planting drive shaft 165, and rotational power is transmitted from the drive main shaft 71 to the transmission gear 166 to rotate the planting drive shaft 165.

[0204] As shown in FIGS. 28 and 29, a first planting lifting mechanism 167R (planting lifting mechanism 167) is provided on the first swing frame 164R, and a right planting body 12R is provided on the first planting lifting mechanism 167R so as to be reciprocally movable up and down. A second planting lifting mechanism 167L (planting lifting mechanism 167) is provided on the second swing frame 164L, and a left planting body 12L is provided on the second planting lifting mechanism 167L so as to be reciprocally movable up and down. The right planting body 12R and the first planting lifting mechanism 167R constitute a first planting device 35R (planting device 35), and the left planting body 12L and the second planting lifting mechanism 167L constitute a second planting device 35L (planting device 35).

[0205] The first soil covering wheel 62R is supported on the first swing frame 164R by a first roller frame (roller frame 168) 168R so as to be swingable up and down. The second soil covering wheel 62L is supported on the swing frame 164 by a second roller frame 168L (roller frame 168) so as to be swingable up and down.

[0206] Since the first roller frame 168R and the second roller frame 168L are formed with the same structure, the first roller frame 168R and the second roller frame 168L will be described together.

[0207] As shown in FIGS. 29 and 30, the roller frame 168 is formed of a pipe material or the like, and has a first side rod portion 168A on the outer side of the machine body, a second side rod portion 168B on the inner side of the machine body, and a rear rod portion 168C at the rear. The first side rod portion 168A has a first portion 168a extending in the longitudinal direction of the machine body and a second portion 168b extending upward from the rear end of the first portion 168a. The front portion of the first portion 168a is rotatably connected about a horizontal axis to a bracket member 169 protruding downward from the first side frame 65A. The second side rod portion 168B has a first portion 168c extending in the longitudinal direction of the machine body and a second portion 168d extending upward from the rear end of the first portion 168c. The front portion of the first portion 168c is rotatably connected about a horizontal axis to a bracket member 170 protruding downward from the second side frame 65B. The rear rod portion 168C connects the rear portions of the first side rod portion 168A and the second side rod portion 168B. Specifically, it connects the upper end portions of the second portion 168b and the second portion 168d. The covering wheel 62 is attached to the rear portions of the first portion 168a and the first portion 168c via stay members 171.

[0208] A first planting depth adjusting mechanism 172R (planting depth adjusting mechanism 172) is provided across the first swing frame 164R and the first roller frame 168R, and a second planting depth adjusting mechanism 172L (planting depth adjusting mechanism 172) is provided across the second swing frame 164L and the second roller frame 168L. Since the first planting depth adjusting mechanism 172R and the second planting depth adjusting mechanism 172L are formed with the same structure, the first planting depth adjusting mechanism 172R and the second planting depth adjusting mechanism 172L will be described together.

[0209] The planting depth adjusting mechanism 172 is a mechanism that fixedly fixes the distance between the roller frame 168 and the swing frame 164 so that the distance can be changed, and adjusts the planting depth of the seedlings 7 by changing the distance.

[0210] As shown in FIGS. 29 and 30, the planting depth adjustment mechanism 172 includes a mechanism frame 173, an adjustment motor 174, a drive mechanism 175, and a link member 176. The mechanism frame 173 is erected on the rear frame portion 164D of the swing frame 164. The adjustment motor 174 is formed by an electric motor and is connected to the control device 131. The adjustment motor 174 is attached to the mechanism frame 173. Specifically, the adjustment motor 174 is attached to the upper part of the mechanism frame 173. The drive mechanism 175 is driven by the adjustment motor 174. Specifically, the drive mechanism 175 includes a first gear 177 driven by the adjustment motor 174 and a second gear 178 that meshes with the first gear 177 and rotates. The link member 176 connects the drive mechanism 175 and the roller frame 168 and moves up and down in conjunction with the drive of the drive mechanism 175.

[0211] The first gear 177 is formed by a pinion gear, and the second gear 178 is formed by a sector gear. The first gear (pinion gear) 177 is rotatably attached to the upper part of the mechanism frame 173. The second gear (sector gear) 178 has its lower part pivotally supported by the mechanism frame 173 and has a gear portion 178a that meshes with the first gear (pinion gear) 177 at the upper part. The second gear 178 (sector gear) has a connecting portion 178b for connecting the link member 176. The upper part 176a of the link member 176 is connected to the connecting portion 178b via a ball joint. The lower part 176b of the link member 176 is connected via a ball joint to a bracket member 179 fixed to the rear rod portion 168C.

[0212] In the above-mentioned planting depth adjustment mechanism 172, by rotating the first gear 177 with the adjustment motor 174, the second gear 178 swings around the pivot portion 180. When the second gear 178 swings, the connecting portion 178b moves up and down to move the link member 176 up and down. When the link member 176 moves up and down, the swing frame 164 swings up and down with respect to the roller frame 168. As a result, the distance between the roller frame 168 and the swing frame 164 changes, and the height of the planting body 12 with respect to the soil covering wheel 62 changes. When the height of the planting body 12 with respect to the soil covering wheel 62 changes, the height of the planting body 12 with respect to the planting surface changes, so the planting depth can be changed. Further, by stopping the drive of the adjustment motor 174, the distance between the roller frame 168 and the swing frame 164 is fixed, and the set planting depth can be maintained.

[0213] The swing frame 164 swings up and down as the soil covering wheel 62 follows the unevenness of the field 6. The swing frame 164 is set to be located at the center of the swing allowable range. When the planting depth is changed, the swing frame 164 swings up and down with respect to the transplanting frame 36, so the relative position in the vertical direction with respect to the transplanting frame 36 changes. Therefore, when the distance between the roller frame 168 and the swing frame 164 is changed, the control device 131 raises and lowers the main frame 37 (transplanting frame 36) in a direction to return the relative position of the swing frame 164 with respect to the transplanting frame 36 according to the change in the distance between the roller frame 168 and the swing frame 164.

[0214] The planting depth adjustment mechanism 172 has a detection unit 182 that detects the amount of change in the distance between the roller frame 168 and the swing frame 164. The detection unit 182 is connected to the control device 131 and feeds back the amount of change in the distance between the roller frame 168 and the swing frame 164 to the control device 131. The detection unit 182 is composed of, for example, a potentiometer. The rotation detector of the detection unit 182 is connected to a pivot 181 that pivotally supports the second gear 178. The pivot 181 rotates integrally with the second gear 178. Therefore, the detection unit 182 detects the amount of rotation of the second gear 178.

[0215] Figure 31 shows a soil covering pressure adjusting mechanism 183 for adjusting the soil covering pressure (the force with which the soil covering wheel 62 presses on the ground) of the soil covering wheel 62. The soil covering pressure adjusting mechanism 183 includes a support plate 185, an operation lever 184, a spring hanging arm 186, a first fixed bracket 187A, a second fixed bracket 187B, an interlocking link 188, and an adjusting spring 189.

[0216] The support plate 185 is fixed to the rear part of the unit frame 38. The operation lever 184 is attached to the support plate 185 so as to be swingable about a pivot 185A. The spring hanging arm 186 is fixed to the operation lever 184 by bolts and swings integrally with the operation lever 184. The first fixed bracket 187A is fixed to the swing frame 164. The second fixed bracket 187B is fixed to the unit frame 38. The interlocking link 188 has a first link 188A pivotally supported by the first fixed bracket 187A and a second link 188B pivotally supported by the second fixed bracket 187B. The first link 188A and the second link 188B are pivotally connected. The adjusting spring 189 is formed of a tension coil spring, one end of which is hooked to a locking hole 186a formed at the end of the spring hanging arm 186, and the other end of which is hooked to a locking hole 188a formed in the first link 188A.

[0217] In the soil covering pressure adjusting mechanism 183, the soil covering pressure can be adjusted by changing the spring force of the adjusting spring 189 by swinging the operation lever 184 around the pivot 185A. A plurality of locking portions 185a are provided on the upper part of the support plate 185, and the operation lever 184 can be fixed at a plurality of positions by locking a locking piece 184a of the operation lever 184 to the locking portions 185a.

[0218] As shown in FIG. 32, the planting depth adjustment mechanism 172 is operated by the operation unit 127. As shown in FIGS. 1A and 1B, the operation unit 127 is provided near the driver's seat 3. Specifically, the operation unit 127 is provided in an inclined shape that moves upward as it goes forward at the upper part of the steering column 27 in front of the driver's seat 3. Further, the operation unit 127 is arranged below the steering wheel 25. Also, the operation unit 127 can be operated by the operator 2 seated in the driver's seat 3. As shown in FIGS. 21 and 30, the operation unit 127 is connected to the control device 131.

[0219] As shown in FIG. 32, the operation unit 127 sends an operation signal for operating the planting depth adjustment mechanism 172 to the control device 131. Also, the operation unit 127 has a planting depth adjustment unit 190 for operating the planting depth adjustment mechanism 172. The planting depth adjustment unit 190 is provided at the rear (lower part) of the operation unit 127. The planting depth adjustment unit 190 has an operation dial (rotary operation member) 191 and an indicator 192 indicating the rotational position of the operation dial 191. The indicator 192 is provided on the upper surface of the operation dial 191. The planting depth adjustment mechanism 172 (adjustment motor 174) is operated by rotating the operation dial 191 to the left or right. The planting depth adjustment unit 190 has a depth display unit 193 indicating the operation direction of the operation dial 191. The depth display unit 193 has the character "deep" provided on the right side of the operation dial 191 and the character "shallow" provided on the left side of the operation dial 191.

[0220] In the above-mentioned planting depth adjustment unit 190, when the operation dial 191 is turned to the right, a first operation signal S1 is sent from the operation unit 127 to the control device 131. When the control device 131 acquires the first operation signal S1, it operates the planting depth adjustment unit 190 in the direction of increasing the planting depth. The index 192 is set to the reference planting depth in a state where it faces forward (upward) as shown in FIG. 32. When the operation dial 191 is turned to the right from the state where the index 192 faces forward, the planting depth becomes deeper from the reference depth as it is turned more. Also, when the operation dial 191 is turned to the left, a second operation signal S2 is sent from the operation unit 127 to the control device 131. When the control device 131 acquires the second operation signal S2, it operates the planting depth adjustment unit 190 in the direction of decreasing the planting depth. When the operation dial 191 is turned to the left from the state where the index 192 faces forward, the planting depth becomes shallower from the reference depth as it is turned more. Note that the planting depth may be increased when the operation dial 191 is turned to the right and decreased when it is turned to the left.

[0221] The operation dial 191 can be operated stepwise, and the planting depth can be adjusted stepwise. The operation dial 191 may be made continuously operable so that the planting depth can be continuously adjusted.

[0222] Since the operator 2 can operate the planting depth adjustment mechanism 172 while sitting on the driver's seat 3 by the planting depth adjustment unit 190, the adjustment of the planting depth of the seedlings 7 can be easily performed.

[0223] The operation unit 127 has an angle adjustment unit 194. The angle adjustment unit 194 performs an operation of lowering one side in the machine width direction K2 of the planting work machine 4 around the rolling axis X1 or lowering the other side. By lowering one side in the machine width direction K2 of the planting work machine 4, the planting body 12 on that side is lowered, and by lowering the other side in the machine width direction K2 of the planting work machine 4, the planting body 12 on the other side is lowered. Thereby, fine adjustment of the planting depth can be performed.

[0224] For example, even if the first planting surface 144R and the second planting surface 144L are at the same height, the planting depth of the seedlings 7 planted by the right planter 12R and the planting depth of the seedlings 7 planted by the left planter 12L may be slightly different. In such a case, for example, the planter 12 with the shallower planting depth is lowered to finely adjust the planting depth. The rolling control is performed in the state where this adjustment has been made.

[0225] As shown in FIG. 32, the angle adjustment unit 194 is provided at the front part (upper part) of the operation unit 127 and has a lower right switch 195 and a lower left switch 196 arranged side by side in the machine body width direction K2. The lower right switch 195 sends a first lowering signal to the control device 131 to lower the right side (the first planter arrangement side) of the planting work machine 4 around the rolling axis X1. In other words, the lower right switch 195 sends a first lowering signal S3 to the control device 131 to lower the first planter arrangement side of the planting work machine 4 around the rolling axis X1. When the control device 131 acquires the first lowering signal S3, it lowers the right side of the planting work machine 4.

[0226] The lower left switch 196 sends a second lowering signal S4 to the control device 131 to lower the left side (the second planter arrangement side) of the planting work machine 4 in the machine body width direction K2 around the rolling axis X1. When the control device 131 acquires the second lowering signal S4, it lowers the left side of the planting work machine 4.

[0227] For example, each time the lower right switch 195 or the lower left switch 196 is pressed, the planting work machine 4 rotates by a predetermined angle around the rolling axis X1, and the planting depth can be finely adjusted in a predetermined dimension unit (a few millimeters or a few centimeters). Note that it is not limited to this.

[0228] Further, the operation unit 127 has a transplanting unit height adjustment unit 197. The transplanting unit height adjustment unit 197 is arranged in the middle part of the operation unit 127 (between the angle adjustment unit 194 and the planting depth adjustment unit 190), and has a raising switch 198 and a lowering switch 199. The lowering switch 199 is arranged to the right and rear (lower) of the raising switch 198.

[0229] The transplanting part height adjusting part 197 corrects the difference in the sinking amount between the sensing roller 126 and the soil covering wheel 62. It is also used to correct the deviation of mechanical and electrical initial values. The aim is to prevent the swing frame 164 from deviating significantly above or below the swing range.

[0230] This will be described in detail below. Also, the numerical values described in the following explanations are exemplary and not limiting.

[0231] The planting body 12 and the soil covering wheel 62 are attached to the swing frame 164 that swings up and down with the front part (planting drive shaft 165) as the fulcrum. If the soil covering wheel 62 (which is in contact with the ground) is raised by, for example, 1 cm relative to the swing frame 164, the swing frame 164 will lower and the planting body 12 will enter the ground about 1 cm deeper, and the planting depth will become about 1 cm deeper.

[0232] The swing frame 164 has a swing range of about 4 cm at the soil covering wheel 62 part. If the soil covering wheel 62 is at the center of the swing range, the planting depth can be kept constant even if there are ±2 cm undulations in the ridge.

[0233] However, if the height of the transplanting frame 36 (the height of the rotation fulcrum (planting drive shaft 165) of the swing frame 164) is the same, when the soil covering wheel 62 is raised by 1 cm, the swing frame 164 will shift to the lower side of the swing range and the ridge undulation adaptation range will be -1 cm to +3 cm. Therefore, when increasing the planting depth by 1 cm, the soil covering wheel 62 is raised by 1 cm and the transplanting frame 36 is lowered by 1 cm so that the swing frame 164 is at the center of the swing range.

[0234] The planting depth adjustment range is -2 cm to +5 cm, and 0 means that the upper surface of the root ball (the bedding soil of the seedling 7) and the upper surface of the ridge are on the same plane. It doesn't necessarily mean that 0 is exactly on the same plane; it means that more adjustment allowance is taken on the deep planting side.

[0235] Incidentally, the ground contact height of the sensing roller 126 and the ground contact height of the covering wheel 62 are not the same. That is, since the covering wheel 62 has a higher compaction load than the sensing roller 126, the covering wheel 62 sinks, and the covering wheel 62 becomes lower than the sensing roller 126. In design, it is considered that the covering wheel 62 is 1 cm lower, but the difference in the amount of sinking changes depending on the adjustment of the compaction load of the covering wheel 62, the hardness of the ridge surface, the presence or absence of a mulch film, etc. In order to correct this difference in the amount of sinking, a transplanting unit height adjustment unit 197 is provided.

[0236] When the lowering switch 199 is pressed, the transplanting unit height adjustment unit 197 sends a correction value (first correction value S5) to the control device 131, and the control device 131 lowers the transplanting frame 36 based on this. Specifically, normally, when the difference in the ground contact surfaces between the sensing roller 126 and the covering wheel 62 is 1 cm, if the ridge is soft and the sinking of the covering wheel 62 is large (the swing frame 164 is displaced downward within the swing range) and the difference in the ground contact surfaces is large, for example, if the difference in the ground contact surfaces is 1.5 cm, then press the lowering switch 199 ("lower") to lower the transplanting frame 36 by 0.5 cm (raise the sensing roller by 0.5 cm) to correct so that the swing frame 164 is at the center of the swing range.

[0237] Also, when the raising switch 198 is pressed, the transplanting unit height adjustment unit 197 sends a correction value (second correction value S6) to the control device 131, and the control device 131 raises the transplanting frame 36 based on this. Specifically, when the ridge is hard or there is a mulch film, the difference in the ground contact surface heights between the sensing roller 126 and the covering wheel 62 is small, and the swing frame 164 is displaced upward within the swing range. Therefore, press the raising switch 198 ("higher") to raise the transplanting frame 36.

[0238] Incidentally, the raise switch 198 and the lower switch 199 may be configured to change a numerical value in a predetermined dimension unit each time they are pressed. Also, when the soil covering ring 62 aims for 2 cm in the planting depth adjustment, the detection roller 126 aims for 3 cm which is 1 cm higher than the soil covering ring 62. That is, when the detected value of the detection roller 126 becomes +1 cm (4 cm), the transplanting frame 36 is raised, and when it becomes -1 cm (2 cm), the transplanting frame 36 is lowered. Also, when the raise switch 198 is pressed to make the transplanting frame height 0.5 cm "higher", the detection roller 126 is controlled to target 2.5 cm which is (1 - 0.5 =) 0.5 cm higher than the soil covering ring 62. That is, when the detected value of the detection roller 126 becomes +1 cm (3.5 cm), the transplanting frame 36 is raised, and when it becomes -1 cm (1.5 cm), the transplanting frame 36 is lowered. Also, when the lower switch 199 is pressed to make the transplanting frame height 0.5 cm "lower", the detection roller 126 is controlled to target 3.5 cm which is (1 + 0.5 =) 1.5 cm higher than the soil covering ring 62. That is, when the detected value of the detection roller 126 becomes +1 cm (4.5 cm), the transplanting frame 36 is raised, and when it becomes -1 cm (2.5 cm), the transplanting frame 36 is lowered.

[0239] Now, with reference to FIGS. 33, 34, etc., the first planting elevating mechanism 167R and the second planting elevating mechanism 167L will be described. Since the first planting elevating mechanism 167R and the second planting elevating mechanism 167L are formed symmetrically on the left and right with the same structure, the first planting elevating mechanism 167R and the second planting elevating mechanism 167L will be described together.

[0240] As shown in FIGS. 33 and 34, the planting elevating mechanism 167 includes a first rotating case 201, a second rotating case 202, and a support plate 121. The first rotating case 201 is rotatably supported on the first side frame portion 164A via a first support shaft 205. Specifically, a bearing member 204 is provided on a bracket member 169 provided on the first side frame portion 164A, the first support shaft 205 is rotatably supported by this bearing member 204, and the first rotating case 201 is supported on the first support shaft 205. A sprocket 203 is integrally rotatably attached to the first support shaft 205. As shown in FIG. 28, power is transmitted from a sprocket 207 integrally rotatably attached to the planting drive shaft 165 to the sprocket 203.

[0241] As shown in FIGS. 33 and 34, the second rotating case 202 is rotatably supported around a second support shaft 206 on the free end side of the first rotating case 201. The support plate 121 is supported by the second rotating case 202. Specifically, a bearing member 209 is provided via a pivot shaft 208 on the upper part of the support plate 121, a bearing member 211 is fixed to the lower end side of a plate member 210 protruding downward from this bearing member 209, and a third support shaft 215 provided on the second rotating case 202 is supported by this bearing member 211. The planting body 12 is supported on the support plate 121. Specifically, the planting body 12 has a front component 12A and a rear component 12B. The upper front side of the front component 12A is rotatably supported around a pivot shaft 212A provided on the support plate 121, and the upper rear side of the rear component 12B is rotatably supported around a pivot shaft 212B provided on the support plate 121.

[0242] The planting elevating mechanism 167 is driven by the power transmitted to the first support shaft 205 to raise and lower the planter 12. Specifically, as shown in FIG. 34, in the first rotating case 201 and the second rotating case 202, when the first rotating case 201 rotates in the direction of arrow Y1 around the first support shaft 205, the second rotating case 202 rotates in the direction opposite to that of the first rotating case 201 (the direction of arrow Y2) in conjunction with the rotation of the first rotating case 201. A power transmission device is provided. When the first rotating case 201 and the second rotating case 202 rotate, the support plate 121 moves vertically while moving back and forth, and the planter 12 moves up and down (elevates) along an elliptical trajectory.

[0243] As shown in FIG. 34, the planter 12 is provided on the side of the planting elevating mechanism 167 (the second rotating case 202). Specifically, the planter 12 is provided at a position overlapping the second rotating case 202 in a side view. Thereby, the planting device (the planter 12 and the planting elevating mechanism 167) can be configured compactly, and as shown in FIG. 33, the planter 12 can be brought closer to the seedling placing table 9 while preventing interference with the seedling placing table 9.

[0244] As shown in FIG. 35, the first seedling placing table 9R and the second seedling placing table 9L are arranged side by side in the machine body width direction K2 and mounted on the main frame 37. The first seedling placing table 9R and the second seedling placing table 9L are movably supported in the machine body width direction K2 by the rail members (the first rail 56 and the second rail 58) of the main frame 37.

[0245] As shown in FIG. 36, the reversing guide 13 is provided at the center, the right side, and the left side in the machine body width direction K2 at the lower part of the seedling placing table 9, and is attached to the support rod 217 provided at the lower part of the seedling placing table 9. The empty tray guide 14 includes a first rod portion 14A arranged outside the machine body of the seedling placing table 9, a second rod portion 14B arranged inside the machine body of the seedling placing table 9, and a connecting rod portion 14C connecting the upper parts of the first rod portion 14A and the second rod portion 14B. The lower part of the seedling placing table 9 has a first accommodating portion 218 provided on the right side and a second accommodating portion 219 provided on the left side.

[0246] As shown in Fig. 36, a seedling shortage sensor 281 for detecting the replenishment timing of the seedling tray 8 is provided at the lower part of the seedling placing table 9. With the seedling shortage sensor 281 in an operating state, two seedling trays 8 can be replenished on the placement plate 10.

[0247] As shown in Figs. 37 and 38, the first seedling placing table 9R has a first holder member 221R. The first holder member 221R has an upper holder 222R and a lower holder 223R provided on the lower side of the upper holder 222R. The upper holder 222R has a first stay 224R attached to the first accommodating portion 218, a second stay 225R attached to the second accommodating portion 219, and a connecting stay 226R connecting the first stay 224R and the second stay 225R. A first stay plate 227R is fixed to the inner side (left side) of the connecting stay 226R within the machine body. A connecting bracket 228 is fixed to the connecting stay 226R (see Fig. 37). The connecting bracket 228 is disposed on the outer side of the first stay plate 227R outside the machine body and is also fixed to the first stay plate 227R. At the lower part of the first seedling placing table 9R, an operating shaft 229 extending in the machine body width direction K2 is provided so as to be rotatable over the machine body width direction K2. The outer side of the operating shaft 229 outside the machine body protrudes greatly outward from the first accommodating portion 218. Two followers 230 are attached to the operating shaft 229 at intervals in the machine body width direction K2.

[0248] The lower holder 223R has a first stay 231R attached to the first accommodating portion 218, a second stay 232R attached to the second accommodating portion 219, and a connecting stay 233R connecting the first stay 231R and the second stay 232R.

[0249] A plurality of first rollers 234R are rotatably attached to the connecting stay 226R and the connecting stay 233R. The first rollers 234R attached to the connecting stay 226R are supported by the first rail 56 so as to be movable in the machine body width direction K2. The first rollers 234R attached to the connecting stay 233R are supported by the second rail 58 so as to be movable in the machine body width direction K2.

[0250] As shown in FIGS. 37 and 38, the second seedling placing table 9L has a second holder member 221L. The second holder member 221L has an upper holder 222L and a lower holder 223L provided below the upper holder 222L. The upper holder 222L has a first stay 224L attached to the first accommodating portion 218, a second stay 225L attached to the second accommodating portion 219, and a connecting stay 226L connecting the first stay 224L and the second stay 225L. A second stay plate 227L is fixed to the inner side (right side) of the connecting stay 226L within the machine body. The lower holder 223L has a first stay 231L attached to the first accommodating portion 218, a second stay 232L attached to the second accommodating portion 219, and a connecting stay 233L connecting the first stay 231L and the second stay 232L.

[0251] A plurality of second rollers 234L are rotatably attached to the connecting stay 226L and the connecting stay 233L. The plurality of second rollers 234L attached to the connecting stay 226L are supported by the first rail 56 so as to be movable in the machine body width direction K2. The plurality of second rollers 234L attached to the connecting stay 233L are supported by the second rail 58 so as to be movable in the machine body width direction K2.

[0252] As shown in FIG. 37, a connecting member 235 extending in the machine body width direction K2 is provided from the left part of the first seedling placing table 9R to the second seedling placing table 9L. The first stay plate 227 is bolt-fixed to the right part of the connecting member 235. The second stay plate 227L is bolt-fixed to the connecting member 235 so as to be position-adjustable in the machine body width direction K2.

[0253] Since the first seedling placing table 9R and the second seedling placing table 9L are connected via the connecting member 235, the first seedling placing table 9R and the second seedling placing table 9L move integrally in the machine body width direction K2 along the first rail 56 and the second rail 58.

[0254] Fig. 37 shows the states of the first seedling placing table 9R and the second seedling placing table 9L when the inter-row space W1 is at the narrowest interval. By changing the mounting position of the second stay plate 227L from this state, it is possible to adjust the interval in the machine body width direction K2 between the first seedling placing table 9R and the second seedling placing table 9L in accordance with the adjustment of the inter-row space W1.

[0255] Fig. 39 shows a lateral feed mechanism 236 that intermittently laterally feeds the first seedling placing table 9R and the second seedling placing table 9L by one pitch in the machine body width direction K2. The lateral feed mechanism 236 has a lateral feed shaft 237 disposed below the first seedling placing table 9R. The lateral feed shaft 237 extends in the machine body width direction K2 and is supported by a support 238 fixed to the first unit frame 38R. The support 238 is provided on the frame body 64 of the first unit frame 38R. The support 238 includes a first bracket 238A attached to the frame body 64, a second bracket 238B fixed to the first bracket 238A, a third bracket 238C fixed to the right end side of the second bracket 238B, a gear box 238D fixed to the second bracket 238B and the third bracket 238C, and a fourth bracket 238E provided on the side of the second bracket 238B opposite to the gear box 238D. The lateral feed shaft 237 is provided across the gear box 238D and the fourth bracket 238E. A first transmission sprocket 239 that can rotate integrally with the drive main shaft 71 and can move in the axial direction is provided at the lower part of the third bracket 238C. The first transmission sprocket 239 can transmit power to a second transmission sprocket 240 provided on the second bracket 238B. The power transmitted to the second transmission sprocket 240 is transmitted from an input shaft rotatably provided integrally with the second transmission sprocket 240 to the lateral feed shaft 237 through a transmission mechanism in the gear box 238D.

[0256] A Napier screw with a spiral groove (so-called traverse groove) 237a that reciprocates in the axial direction is formed on the outer peripheral surface of the cross-feed shaft 237. A sliding body 241 having an engaging portion 241a that engages with the traverse groove 237a is fitted onto the cross-feed shaft 237. A connecting shaft 242 is provided on the sliding body 241, and the connecting shaft 242 is connected to a connecting bracket 228 provided on the first seedling placing table 9R's first holder member 221R. Vertical feed cams (operating bodies) 243 are fixed to one end side and the other end side of the cross-feed shaft 237.

[0257] When the cross-feed shaft 237 rotates, the engaging portion 241a is guided along the traverse groove 237a, causing the sliding body 241 to reciprocate in the machine body width direction K2. As a result, the first seedling placing table 9R can reciprocate in the machine body width direction K2. Further, since the second seedling placing table 9L is connected to the first seedling placing table 9R via a connecting member 235, the first seedling placing table 9R and the second seedling placing table 9L can reciprocate integrally in the machine body width direction K2.

[0258] When adjusting the row spacing W1, since the first seedling placing table 9R and the first unit frame 38R (first transplanting unit 63R) are connected via a cross-feed mechanism 236 and the first seedling placing table 9R and the second seedling placing table 9L are connected by a connecting member 235, the first seedling placing table 9R, the second seedling placing table 9L, and the first transplanting unit 63R are integrally position-adjusted in the machine body width direction K2. The second transplanting unit 63L is position-adjusted separately from the first transplanting unit 63R. After adjusting the first transplanting unit 63R and the second transplanting unit 63L in the machine body width direction K2, the second seedling placing table 9L is position-adjusted according to the adjusted row spacing W1.

[0259] FIG. 40 shows a vertical feed mechanism 244 that vertically feeds the seedling tray 8 downward by one pitch of the pot portion 8a along the inclined direction, and a seedling take-out device 11. The vertical feed mechanism 244 has a tray feed mechanism 245 provided in each of the first accommodation portion 218 and the second accommodation portion 219 of each seedling placement table 9. The tray feed mechanism 245 has a drive sprocket 246, a driven sprocket 247, and an endless conveyor chain 248 wound around the drive sprocket 246 and the driven sprocket 247. Conveyor pins 249 that fit between the pot portions 8a are provided at intervals in the longitudinal direction on the conveyor chain 248. By rotating the drive sprocket 246 in the direction of arrow Y3 in FIG. 40, the seedling tray 8 is vertically fed downward (in the direction of arrow Y4 in FIG. 40) along the placement plate 10 via the conveyor chain 248 and the conveyor pins 249.

[0260] As shown in FIG. 40, the seedling take-out device 11 is disposed behind the lower part of the seedling placement table 9 and has seedling take-out claws 250. The seedling take-out claws 250 project into the pot portion 8a from the rear to pierce the root ball of the seedling 7, and by retreating from the pot portion 8a in the state of piercing the root ball, the seedling 7 is taken out from the pot portion 8a. After taking out the seedling 7, the seedling take-out claws 250 change their posture so that the bedding soil (root ball) of the seedling 7 faces the lower planting body 12, and then the seedling 7 is released and put into the planting body 12.

[0261] Now, as shown in FIG. 1D, in the transplanting machine 1 of the present embodiment, in the setting mode for setting before the start of automatic steering, it is possible to set the reference orientation from the information received from the mobile terminal 498.

[0262] The communication device 401 receives information regarding automatic steering from the mobile terminal 498. Specifically, the communication device 401 may have a wireless communication module that acquires correction information for positioning errors by communicating via the Internet or a telephone communication network, apart from acquiring correction information for positioning errors from the wireless signal received by the communication antenna 403. Further, the communication device 401 may have a short-range wireless communication module that receives a wireless signal including correction information for positioning errors from the mobile terminal 498. This short-range wireless communication module is a device that performs wireless communication, for example, by Bluetooth (registered trademark) Low Energy in the Bluetooth (registered trademark) specification of the communication standard IEEE802.15.1 series.

[0263] As shown in FIG. 1D, the control device 131 has a setting unit 131C. The setting unit 131C sets a reference azimuth from the information received by the communication device 401, that is, the information regarding automatic steering from the mobile terminal 498. The control device 131 performs control of automatic steering to make the traveling body 5 travel along the reference azimuth.

[0264] Further, the communication device 401 can transmit setting information to the mobile terminal 498. The setting information is various information set in the transplanter 1 and includes information regarding automatic steering.

[0265] For example, when the control device 131 is in a setting mode for performing settings before the start of automatic steering, it causes the communication device 401 to transmit all or a selected one of the reference azimuths stored in the storage device 131B to the mobile terminal 498. Further, when there is an instruction to overwrite the reference azimuth from the mobile terminal 498, the setting unit 131C overwrites the selected reference azimuth or the stored reference azimuth instructed from the mobile terminal 498 with the new reference azimuth from the mobile terminal 498 and stores it in the storage device 131B.

[0266] As shown in FIG. 1D, the transplanter 1 has a notification device 440. The storage device 131B can store the reference azimuth up to a predetermined upper limit number (for example, 10). When one of the reference azimuths already stored in the storage device 131B is selected in the setting mode, the control device 131 causes the segment display unit 361 to display the selected reference azimuth and causes the notification device 440 to notify the selected reference azimuth.

[0267] When there is an instruction to overwrite the new reference azimuth, the setting unit 131C overwrites the selected stored reference azimuth with the new reference azimuth and stores it in the storage device 131B.

[0268] The notification device 440 includes, for example, a speaker 402 and an audio output device 402A such as headphones. When one of the reference azimuths already stored in the storage device 131B is selected, the control device 131 causes the audio output device 402A to output the selected reference azimuth as audio.

[0269] In addition, in the transplanter 1 of the present embodiment, in the setting mode, various information settings and the like can be performed by manual input by the operator 2. For example, in the transplanter 1 of the present embodiment, the reference azimuth can be set by manual input by the operator 2 in the setting mode without performing the operation of running the transplanter 1 in the field 6 to obtain the reference azimuth. Also, in the setting mode, information other than the reference azimuth can be set by manual input by the operator 2. Therefore, the setting mode is a mode in which, before the start of automatic steering, the operator 2 can input, call, change, etc. the setting values of various setting items by manual input.

[0270] The control device 131 causes the transplanter 1 to shift to the setting mode based on a predetermined operation. The predetermined operation here is, for example, simultaneously pressing and holding the third switch 355 and the fourth switch 356 while the main switch 354 is on (for example, the switch key is in the start or operation position). Also, the predetermined operation may be, after pressing the steering changeover switch 351 while the main switch 354 is off (that is, the switch key is in the stop position), turning on the main switch 354 (for example, moving the switch key to the start or operation position) and then releasing the steering changeover switch 351 within 2 seconds, or it may be other operations. Note that when the transplanter 1 is not in the setting mode, it is a non-setting mode in which various settings cannot be made. The non-setting mode is a mode that allows operations other than making various settings, and for example, manual operation or operation by automatic steering can be performed.

[0271] The setting unit 131C of the control device 131 functions as the setting unit 131C, for example, when the aforementioned processor of the control device 131 executes a setting program stored in the storage device 131B. The setting unit 131C performs settings related to the traveling and work of the transplanter 1 (such as automatic sensitivity setting, azimuth setting, GPS adjustment, row spacing setting, and RTK setting). Regarding the azimuth setting, the setting unit 131C can set the azimuth input (for example, manually input) by the operator as the reference azimuth. More specifically, when in the setting mode, the setting unit 131C accepts the input of the azimuth (for example, manual input of the azimuth by the operator) and stores the input azimuth in the storage device 131B as the reference azimuth.

[0272] Note that the communication device 401 may communicate with a server 499 that manages work information.

[0273] In the above-described transplanter 1, the case where the antenna unit 400 that receives satellite positioning information is arranged above the center in the machine width direction K2 at the front of the bonnet 26 has been exemplified, but the location where the antenna unit 400 is arranged is not limited to the location shown in the above embodiment.

[0274] For example, as shown in FIGS. 41A, 41B, and 41C, in a transplanter 1 in which a plurality of components (for example, a planter 12, a seedling take-out device 11, and a pair of soil covering rings 62) for planting vegetable seedlings 7 are arranged side by side in the machine width direction K2, The antenna unit 400 may be arranged within a range 526 extending in the longitudinal direction K1 of the machine, which is the width (width in the machine width direction) T1 between the outer ends of one of the plurality of components (the planter 12, the seedling take-out device 11, and the pair of soil covering rings 62) in the planter unit 525 at one end (left end) in the machine width direction K2 and the same component as the one component in the planter unit 525 at the other end (right end) in the machine width direction K2.

[0275] Specifically, FIG. 41A shows a case where the width T1 in the machine width direction and the width T2 in the longitudinal direction of the machine of the range 526 for arranging the antenna unit 400 are set as follows. In FIG. 41A, the distance between the outer ends in the machine width direction K2 of the planter 12 of the left planter unit 525 and the planter 12 of the right planter unit 525 is defined as the width T1 in the machine width direction, and the distance in the longitudinal direction K1 of the machine from the vicinity of the front end portion of the transplanter 1 (traveling body 5) to the vicinity of the rear end portion of the transplanter 1 (planting work machine 4) is defined as the width T2 in the longitudinal direction of the machine.

[0276] In FIG. 41B, the distance between the outer ends in the machine width direction K2 of the seedling take-out device 11 of the left planter unit 525 and the seedling take-out device 11 of the right planter unit 525 is defined as the width T1 in the machine width direction. The width T2 in the longitudinal direction of the machine is the same as in the case of FIG. 41A above.

[0277] In FIG. 41C, the distance between the outer ends in the machine width direction K2 of the pair of soil covering rings 62 of the left planter unit 525 and the pair of soil covering rings 62 of the right planter unit 525 is defined as the width T1 in the machine width direction. The width T2 in the longitudinal direction of the machine is the same as in the case of FIG. 41A above. The outer ends of the pair of soil covering rings 62 are the outer ends in the machine width direction K2 of the soil covering rings 62 located on the outer side in the machine width direction K2.

[0278] The width T1 in the machine width direction is, for example, the distance between the outer ends in the machine width direction K2 of the plurality of components when the row spacing W1 is the maximum row spacing.

[0279] Further, the antenna unit 400 is preferably disposed at substantially the center in the machine width direction K2 of the range 526. In FIG. 41A, a case is illustrated where the antenna unit 400 is disposed above substantially the center between the planter 12 of the planting unit 525 at one end in the machine width direction K2 and the planter 12 of the planting unit 525 at the other end in the machine width direction K2. In FIG. 41B, a case is illustrated where the antenna unit 400 is disposed above substantially the center between the seedling take-out device 11 of the planting unit 525 at one end in the machine width direction K2 and the seedling take-out device 11 of the planting unit 525 at the other end in the machine width direction K2. In FIG. 41C, a case is illustrated where the antenna unit 400 is disposed above substantially the center between the pair of soil covering rings 62 of the planting unit 525 at one end in the machine width direction K2 and the pair of soil covering rings 62 of the planting unit 525 at the other end in the machine width direction K2.

[0280] When the antenna unit 400 is disposed above the traveling body 5, for example, the antenna unit 400 is attached to a frame member provided on the traveling body 5 (see FIGS. 1A and 43A). The frame member is not limited to one provided on the traveling body 5, and may be a frame member separately provided for attaching the antenna unit 400. When the antenna unit 400 is disposed above the planting work machine 4, for example, the antenna unit 400 is attached to a frame member attached to the traveling body 5 and extending upward from the traveling body 5 above the planting work machine 4 (see FIG. 42A). When the antenna unit 400 is disposed above the planting work machine 4, the frame member to which the antenna unit 400 is attached can also be attached to the main frame 37.

[0281] In the embodiments described in FIGS. 41A, 41B, and 41C, a case where two sets of planting units 525 are provided in the machine width direction K2 is illustrated. However, the number of planting units 525 is not limited to two sets, and three or more sets of planting units 525 may be provided in the machine width direction K2. Further, the components for planting the vegetable seedlings 7 are not limited to the above three components.

[0282] Figures 42A and 42B illustrate the case where the antenna unit 400 is disposed above the planting work implement 4. As long as it is above the planting work implement 4, the arrangement position is not limited. Specifically, in the case of the embodiment shown in FIGS. 42A and 42, the range where the antenna unit 400 is disposed is a range with the width in the machine body width direction K2 of the planting work implement 4 as the machine body width direction width and the width in the machine body longitudinal direction K1 of the planting work implement 4 as the machine body longitudinal direction width.

[0283] Figures 42A and 42B illustrate the case where the attachment body 527 is attached to the frame member 28C of the rear reserve seedling table device 28K, and the antenna unit 400 is attached to the attachment body 527.

[0284] As shown in FIGS. 42A and 42B, the attachment body 527 includes left and right first rod portions 529 extending rearward from brackets 528 attached to upper connecting portions 28C3 of the left and right frame members 28C, left and right second rod portions 530 extending upward from rear end portions of the respective first rod portions 529, a third rod portion 531 connecting upper end portions of the left and right second rod portions 530, and left and right fourth rod portions 532 having one end connected to the connecting member 506 via a connecting member (cylindrical member) 533 and the other end connected to the first rod portion 529 via a connecting member (cylindrical member) 534.

[0285] The attachment body 527 is not limited to the structure shown in the figures, and various design changes are possible. The attachment body 527 is not limited to being attached to the frame member 28C, and may be configured to be attached to a frame member separately provided on the traveling body 5 in order to attach the attachment body 527. Further, the attachment body 527 can also be attached to the main frame 37.

[0286] As shown by the solid lines in FIGS. 42A and 42B, the antenna unit 400 is preferably disposed above the substantially central portion in the machine width direction K2 of the planting work machine 4. In the solid lines of FIGS. 42A and 42B, the antenna unit 400 is disposed above the central portion in the machine width direction K2 between the seedling placing table 9 at one end in the machine width direction K2 and the seedling placing table 9 at the other end in the machine width direction K2. Specifically, the antenna unit 400 is disposed at the substantially central portion of the moving range of the plurality of seedling placing tables 9. It is not limited thereto, and the antenna unit 400 may be disposed above the outer ends between the seedling placing table 9 at one end in the machine width direction K2 and the seedling placing table 9 at the other end in the machine width direction K2. Also in this embodiment, the antenna unit 400 is above the substantially central portion in the machine width direction K2 of the plurality of planters 12 arranged side by side in the machine width direction K2, or above the substantially central portion in the machine width direction K2 of the seedling taking-out device 11 arranged side by side in the machine width direction K2, or above the substantially central portion in the machine width direction K2 of the pair of soil covering wheels 62 arranged side by side in the machine width direction K2.

[0287] In this embodiment, the antenna unit 400 is disposed above the planting work machine 4 to receive satellite positioning information (position information) at a position above the planting work machine 4, that is, to detect the position of itself (the transplanter 1) above the planting work machine 4. Thereby, when performing automatic steering control to make the transplanter 1 (the traveling body 5) travel along the reference azimuth (the target traveling line) based on the satellite positioning information received by the antenna unit 400, the position of itself is detected at a position above the planting work machine 4, and by the automatic steering control, position control of the planting work machine 4 with respect to the target traveling line is performed (automatic steering control is performed so that the planting work machine 4 moves along the target traveling line), whereby displacement of the planting work machine 4 in the machine width direction K2 with respect to the target traveling line can be suppressed. Subsequently, it is possible to suppress the seedlings 7 from being planted in a disorderly manner in the machine front-rear direction K1.

[0288] Further, by disposing the antenna unit 400 above the substantially central portion in the machine width direction K2 between the seedling placing tables 9 at one end in the machine width direction K2 and the seedling placing tables 9 at the other end in the machine width direction K2 of the planting work machine 4, above the substantially central portion in the machine width direction K2 of the plurality of planting bodies 12 arranged side by side in the machine width direction K2, above the substantially central portion in the machine width direction K2 of the seedling take-out device 11 arranged side by side in the machine width direction K2, or above the substantially central portion in the machine width direction K2 of the pair of soil covering rings 62 arranged side by side in the machine width direction K2, it is possible to effectively suppress the displacement in the machine width direction K2 of the planting work machine 4 with respect to the target travel line.

[0289] FIGS. 43A, 43B, and 43C illustrate a case where the antenna unit 400 is supported by a support body (in the illustrated example, one and the other frame members 28C) provided upright at the rear of the traveling body 5. Specifically, the support body of the embodiment illustrated in FIGS. 43A, 43B, and 43C includes the frame member 28C (28CL) of the rear auxiliary seedling table device 28K on one side (left) in the machine width direction K2 and the frame member 28C (28CR) of the rear auxiliary seedling table device 28K on the other side (right) in the machine width direction K2. However, the present invention is not limited to this, and the support body for supporting the antenna unit 400 may be a separately provided support body for attaching the antenna unit 400 to the rear of the traveling body 5. In the present embodiment, by using the support body (one and the other frame members 28C) equipped on the transplanter 1, simplification of the configuration and cost reduction can be achieved.

[0290] In the embodiment shown in FIGS. 43A, 43B, and 43C, the antenna unit 400 is disposed above the center or near the center in the vehicle body width direction K2 at the rear of the traveling body 5 and is supported by a support (one and the other frame members 28C). Specifically, as shown in FIG. 43C, one rear wheel 24 on one side in the vehicle body width direction K2 is supported by a rear axle 537 supported by one rear axle case 536 provided at the rear of the vehicle body 16, and the other rear wheel 24 on the other side in the vehicle body width direction K2 is supported by a rear axle 537 supported by the other rear axle case 536 provided at the rear of the vehicle body 16. The antenna unit 400 is disposed above the space between the one rear axle 537 and the other rear axle 537 and is supported by a support (one and the other frame members 28C). Further specifically, the antenna unit 400 is disposed above the center or near the center between the one rear axle 537 and the other rear axle 537 and is supported by a support (one and the other frame members 28C). However, the present invention is not limited thereto, and the antenna unit 400 may be disposed above the rear of the traveling body 5 within the range of the vehicle body width direction K2 of the traveling body 5 and supported by a support (left and right frame members 28C).

[0291] In this embodiment, an antenna unit 400 for receiving satellite positioning information is supported by a support (one and the other frame members 28C) provided upright at the rear part of the traveling body 5, and satellite positioning information (position information) is received at a position above the rear part of the traveling body 5. Then, when performing automatic steering control to make the transplanter 1 (traveling body 5) travel along a reference azimuth (target travel line) based on the satellite positioning information received by the antenna unit, by the automatic steering control, position control is performed on the traveling body 5 with respect to the target travel line at the rear part of the traveling body 5 (near the center of turning) (the automatic steering control is performed so that the rear part of the traveling body 5 moves along the target travel line), whereby displacement in the machine body width direction K2 of the traveling body 5 with respect to the target travel line can be suppressed. Further, since position information is detected at the rear part of the traveling body 5, that is, at a position close to the planting work implement 4, and the transplanter 1 is position-controlled with respect to the target travel line, displacement in the machine body width direction K2 of the planting work implement 4 with respect to the target travel line can also be suppressed. Consequently, it is possible to suppress the seedlings 7 from being planted unevenly in the machine body front-rear direction K1.

[0292] Further, the antenna unit 400 is arranged above the center part in the machine body width direction K2 of the rear part of the traveling body 5 or in the vicinity thereof, or above the space between one rear axle 537 and the other rear axle 537, or further above the center part between one rear axle 537 and the other rear axle 537 or in the vicinity thereof, and by receiving satellite positioning information (position information) at these respective positions, displacement in the machine body width direction K2 of the traveling body 5 and the planting work implement 4 with respect to the target travel line can be effectively suppressed.

[0293] In the embodiment shown in FIGS. 43A, 43B, and 43C, a mounting frame 542 to which the antenna unit 400 is attached is provided, and the mounting frame 542 is provided so as to connect one frame member 28C (28CL) and the other frame member 28C (28CR). Specifically, the mounting frame 542 is provided so as to connect the upper parts of one frame member 28C (28CL) and the other frame member 28C (28CL).

[0294] Specifically, the mounting frame 542 includes left and right first rod portions 539 extending rearward from brackets 538 attached to upper connecting portions 28C3 of left and right frame members 28C, left and right second rod portions 540 extending upward from rear end portions of the respective first rod portions 539, and a third rod portion 541 connecting upper end portions of the left and right second rod portions 540.

[0295] In FIGS. 41A to 41C, FIGS. 42A, 42B, and FIGS. 43A to 43C, the housing 405 (communication device 401 and communication antenna 403) is not shown, but the housing 405 may be provided below the antenna unit 400, may be provided at the position shown in FIGS. 1A and 1B, or may be provided at other locations.

[0296] A preferred embodiment of the present invention provides a transplanter 1 described in the following items. (Item 1-1) A transplanter 1 comprising: a planting work machine 4 for planting vegetable seedlings 7 in a field 6; a traveling body 5 on which the planting work machine 4 is mounted and travels; a driver's seat 3 mounted on the traveling body 5; and an antenna unit 400 for receiving satellite positioning information, wherein the planting work machine 4 has a planting unit 525 including a plurality of components for planting the vegetable seedlings 7, a plurality of the planting units 525 are provided, the plurality of the planting units 525 are arranged side by side in the machine body width direction K2, and the antenna unit 400 is arranged within a range 526 obtained by extending the width T1 between outer ends of one component among the plurality of components in the planting unit 525 at one end in the machine body width direction K2 and the same component as the one component in the planting unit 525 at the other end in the machine body width direction K2 in the machine body front-rear direction K1.

[0297] According to the transplanter 1 related to this Item 1-1, by providing the ride-on transplanter 1 equipped with the driver's seat 3 with the antenna unit 400 that receives satellite positioning information, it is possible to perform automatic steering control to make the transplanter 1 (traveling body 5) travel along the reference azimuth (target travel line) based on the satellite positioning information received by the antenna unit 400. And by performing the above automatic steering control based on the satellite positioning information, the operation burden on the operator 2 can be reduced, and the planting work of the vegetable seedlings 7 can be supported. (Item 1-2) The transplanter 1 according to Item 1-1, wherein the antenna unit 400 is disposed at substantially the center in the machine body width direction K2 of the range 526.

[0298] According to the transplanter 1 related to this Item 1-2, by receiving satellite positioning information at the center in the machine body width direction K2 of the range 526 obtained by extending the width between the outer ends of one component among the plurality of components in the planting unit 525 at one end in the machine body width direction K2 and the same component as the one component in the planting unit 525 at the other end in the machine body width direction K2 in the machine body front-rear direction K1, it is possible to effectively suppress the displacement in the machine body width direction K2 with respect to the target travel line of the transplanter 1. Consequently, it is possible to suppress the seedlings 7 from being planted in a disorderly manner in the machine body front-rear direction K1. (Item 1-3) The transplanter 1 according to Item 1-1 or 1-2, wherein the planting unit 525 includes a planter 12 for planting the seedlings 7 in the field 6, and the one component is the planter 12.

[0299] According to the transplanter 1 related to this Item 1-3, by receiving satellite positioning information in the range 526 obtained by extending the width between the outer ends of the planter 12 in the planting unit 525 at one end in the machine body width direction K2 and the planter 12 in the planting unit 525 at the other end in the machine body width direction K2 in the machine body front-rear direction K1, it is possible to effectively suppress the displacement in the machine body width direction K2 with respect to the target travel line of the transplanter 1. Consequently, it is possible to suppress the seedlings 7 from being planted in a disorderly manner in the machine body front-rear direction K1. (Item 1-4) The planting work machine 4 has a seedling placing table 9 on which the seedling tray 8 is placed. The planting unit 525 includes a seedling extracting device 11 that extracts the seedlings 7 from the seedling tray 8 placed on the seedling placing table 9. The one component is the seedling extracting device 11 of the transplanter 1 described in item 1-1 or 1-2.

[0300] According to the transplanter 1 according to this item 1-4, by receiving satellite positioning information in a range 526 where the width between the outer ends of the seedling extracting device 11 in the planting unit 525 at one end in the machine body width direction K2 and the seedling extracting device 11 in the planting unit 525 at the other end in the machine body width direction K2 is extended in the machine body front-rear direction K1, the displacement of the machine body in the machine body width direction K2 with respect to the target travel line of the transplanter 1 can be effectively suppressed. Consequently, it is possible to suppress the seedlings 7 from being planted unevenly in the machine body front-rear direction K1. (Item 1-5) The planting unit 525 includes a planter 12 for planting the seedlings 7 and a pair of soil covering wheels 62 that roll on the field 6 to press the soil on both sides in the machine body width direction K2 of the seedlings 7 planted by the planter 12. The one component is the pair of soil covering wheels 62 of the transplanter 1 described in item 1 or 2.

[0301] According to the transplanter 1 according to this item 1-5, by receiving satellite positioning information in a range 526 where the width T1 between the outer ends of the pair of soil covering wheels 62 in the planting unit 525 at one end in the machine body width direction K2 and the pair of soil covering wheels 62 in the planting unit 525 at the other end in the machine body width direction K2 is extended in the machine body front-rear direction K1, the displacement of the machine body in the machine body width direction K2 with respect to the target travel line of the transplanter 1 can be effectively suppressed. Consequently, it is possible to suppress the seedlings 7 from being planted unevenly in the machine body front-rear direction K1. (Item 1-6) The antenna unit 400 is disposed above a substantially central portion between the planter 12 of the planting unit 525 at one end in the machine body width direction K2 and the planter 12 of the planting unit 525 at the other end in the machine body width direction K2 of the transplanter 1 described in item 3.

[0302] According to the transplanter 1 according to this item 1-6, by receiving satellite positioning information above a substantially central portion between the planting bodies 12 of the planting unit 525 at one end in the machine body width direction K2 and the planting bodies 12 of the planting unit 525 at the other end in the machine body width direction K2, it is possible to effectively suppress the displacement of the machine body in the machine body width direction K2 with respect to the target travel line of the transplanter 1. Subsequently, it is possible to suppress the seedlings 7 from being planted out of alignment in the machine body longitudinal direction K1. (Item 1-7) The antenna unit 400 is disposed above a substantially central portion between the seedling take-out device 11 of the planting unit 525 at one end in the machine body width direction K2 and the seedling take-out device 11 of the planting unit 525 at the other end in the machine body width direction K2 of the transplanter 1 according to item 4.

[0303] According to the transplanter 1 according to this item 1-7, by receiving satellite positioning information above a substantially central portion between the seedling take-out device 11 of the planting unit 525 at one end in the machine body width direction K2 and the seedling take-out device 11 of the planting unit 525 at the other end in the machine body width direction K2, it is possible to effectively suppress the displacement of the machine body in the machine body width direction K2 with respect to the target travel line of the transplanter 1. Subsequently, it is possible to suppress the seedlings 7 from being planted out of alignment in the machine body longitudinal direction K1. (Item 1-8) The antenna unit 400 is disposed above a substantially central portion between the pair of covering wheels 62 of the planting unit 525 at one end in the machine body width direction K2 and the pair of covering wheels 62 of the planting unit 525 at the other end in the machine body width direction K2 of the transplanter 1 according to item 5.

[0304] According to the transplanter 1 according to this item 1-8, by receiving satellite positioning information above a substantially central portion between the pair of covering wheels 62 of the planting unit 525 at one end in the machine body width direction K2 and the pair of covering wheels 62 of the planting unit 525 at the other end in the machine body width direction K2, it is possible to effectively suppress the displacement of the machine body in the machine body width direction K2 with respect to the target travel line of the transplanter 1. Subsequently, it is possible to suppress the seedlings 7 from being planted out of alignment in the machine body longitudinal direction K1. (Item 2-1) A transplanter 1 including a planting machine 4 for planting vegetable seedlings 7 in a field 6, a traveling body 5 on which the planting machine 4 is mounted and travels, a driver's seat 3 mounted on the traveling body 5, and an antenna unit 400 for receiving satellite positioning information. The antenna unit 400 is disposed above the planting machine 4.

[0305] According to the transplanter 1 according to this Item 2-1, by providing the antenna unit 400 for receiving satellite positioning information on the riding-type transplanter 1 equipped with the driver's seat 3, it is possible to perform automatic steering control to make the transplanter 1 (traveling body 5) travel along the reference azimuth (target travel line) based on the satellite positioning information received by the antenna unit 400. And by performing automatic steering control based on satellite positioning information, the operation burden on the operator 2 can be reduced, and the planting work of the vegetable seedlings 7 can be supported.

[0306] Also, by disposing the antenna unit 400 above the planting machine 4 and receiving satellite positioning information at a position above the planting machine 4, it is possible to suppress the displacement of the planting machine 4 with respect to the target travel line. Subsequently, it is possible to suppress the seedlings 7 from being planted out of alignment in the longitudinal direction K1 of the machine body. (Item 2-2) The transplanter 1 according to Item 2-1, wherein the antenna unit 400 is disposed above a substantially central portion in the machine body width direction K2 of the planting machine 4.

[0307] According to the transplanter 1 according to this Item 2-2, by disposing the antenna unit 400 above a substantially central portion in the machine body width direction K2 of the planting machine 4, it is possible to effectively suppress the displacement in the machine body width direction K2 of the planting machine 4 with respect to the target travel line. (Item 2-3) The planting machine 4 has a plurality of seedling placing tables 9 on which seedling trays 8 are placed. The plurality of seedling placing tables 9 are arranged side by side in the machine body width direction K2. The antenna unit 400 is disposed above the outer ends between the seedling placing table 9 at one end in the machine body width direction K2 and the seedling placing table 9 at the other end in the machine body width direction K2. The transplanter 1 according to Item 2-1 or 2-2.

[0308] Even with the transplanter 1 according to this Item 2-3, it is possible to effectively suppress the displacement in the machine body width direction K2 with respect to the target travel line of the planting work machine 4. (Item 2-4) The transplanter 1 described in Item 2-3, wherein the antenna unit 400 is disposed above a substantially central portion between the seedling placing table 9 at one end in the machine body width direction K2 and the seedling placing table 9 at the other end in the machine body width direction K2.

[0309] According to the transplanter 1 according to this Item 2-4, further, it is possible to effectively suppress the displacement in the machine body width direction K2 with respect to the target travel line of the planting work machine 4. (Item 2-5) The transplanter 1 described in Item 2-3 or 2-4, wherein the plurality of seedling placing tables 9 are configured to be reciprocally movable in the machine body width direction K2, and the antenna unit 400 is disposed at a substantially central portion of the movement range of the plurality of seedling placing tables 9.

[0310] Even with the transplanter 1 according to this Item 2-5, it is possible to effectively suppress the displacement in the machine body width direction K2 with respect to the target travel line of the planting work machine 4. (Item 2-6) The transplanter 1 according to any one of Items 2-1 to 2-5, further comprising a mounting body 527 attached to the traveling body 5 and extending upward from the traveling body 5 above the planting work machine 4, to which the antenna unit 400 is attached.

[0311] According to the transplanter 1 according to this Item 2-6, by attaching the mounting body to which the antenna unit 400 is attached to the traveling body 5, it is possible to stably receive satellite positioning information. (Item 3-1) A planting machine 4 for planting vegetable seedlings 7 in a field 6, a traveling body 5 that mounts the planting machine 4 at the rear and travels, a driver's seat 3 mounted on the traveling body 5, a support body (one frame member 28CL and the other frame member 28CR) provided upright at the rear of the traveling body 5, and an antenna unit 400 that receives satellite positioning information. The antenna unit 400 is supported by the support body of the transplanter 1.

[0312] According to the transplanter 1 according to this item 3-1, by providing the antenna unit 400 that receives satellite positioning information on the riding-type transplanter 1 equipped with the driver's seat 3, it is possible to perform automatic steering control to make the transplanter 1 (traveling body 5) travel along the reference azimuth (target travel line) based on the satellite positioning information received by the antenna unit 400. And by performing the above automatic steering control based on satellite positioning information, the operation burden on the operator 2 can be reduced, and the work of planting the vegetable seedlings 7 can be supported.

[0313] Also, in the transplanter 1 with the planting machine 4 mounted at the rear of the traveling body 5, the antenna unit 400 is supported by a support body provided upright at the rear of the traveling body 5, and by receiving satellite positioning information at a position near the rear of the traveling body 5 and the planting machine 4, it is possible to suppress the displacement of the traveling body 5 and the planting machine 4 with respect to the target travel line. Subsequently, it is possible to suppress the seedlings 7 from being planted in a disorderly manner in the longitudinal direction K1 of the machine body. (Item 3-2) The transplanter 1 according to item 3-1, wherein the antenna unit 400 is disposed above the rear part of the traveling body 5 within a range 526 in the machine width direction K2 of the traveling body 5 and is supported by the support body.

[0314] Also by the transplanter 1 according to this item 3-2, it is possible to suppress the displacement in the machine width direction K2 of the traveling body 5 and the planting machine 4 with respect to the target travel line. (Item 3-3) The antenna unit 400 is disposed above the center or near the center in the machine body width direction K2 at the rear part of the traveling body 5 and is supported by the support, and the transplanter 1 according to item 3-1 or 3-2.

[0315] According to the transplanter 1 according to this item 3-3, it is possible to effectively suppress the displacement in the machine body width direction K2 with respect to the target traveling line of the traveling body 5 and the planting work machine 4. (Item 3-4) The traveling body 5 has, at the rear part, a pair of rear wheels 24 in the machine body width direction K2 and a pair of rear axles 537 in the machine body width direction K2 provided corresponding to the respective rear wheels 24 and supporting the rear wheels 24. The antenna unit 400 is disposed above between one of the rear axles 537 and the other rear axle 537 and is supported by the support, and the transplanter 1 according to any one of items 3-1 to 3-3.

[0316] According to the transplanter 1 according to this item 3-4, it is possible to more effectively suppress the displacement in the machine body width direction K2 with respect to the target traveling line of the traveling body 5. (Item 3-5) The antenna unit 400 is disposed above the center or near the center between one of the rear axles 537 and the other rear axle 537 and is supported by the support, and the transplanter 1 according to item 3-4.

[0317] According to the transplanter 1 according to this item 3-5, it is possible to further more effectively suppress the displacement in the machine body width direction K2 with respect to the target traveling line of the traveling body 5. (Item 3-6) The transplanter 1 according to any one of items 3-1 to 3-5 includes a mounting frame 542 to which the antenna unit 400 is attached. The support includes one frame member 28CL provided upright on one side in the machine body width direction K2 at the rear part of the traveling body 5 and the other frame member 28CR provided upright on the other side in the machine body width direction K2 at the rear part of the traveling body 5. The mounting frame 542 is provided so as to connect the one frame member 28CL and the other frame member 28CR.

[0318] According to the transplanter 1 according to this Item 3-6, the rigidity of the support can be improved by the mounting frame 542. Further, by using the mounting frame 542 to which the antenna unit 400 is attached to improve the rigidity of the support, simplification of the structure and cost reduction can be achieved. (Item 3-7) The transplanter 1 according to Item 6, wherein the mounting frame 542 is provided so as to connect the upper portions of the one frame member 28CL and the other frame member 28CR to each other.

[0319] Also by the transplanter 1 according to this Item 3-7, improvement of the rigidity of the support, simplification of the structure, and cost reduction can be achieved. (Item 3-8) The transplanter 1 according to Item 6 or 7, wherein the one frame member 28CL and the other frame member 28CR are arranged behind the seat portion which is the portion where the operator 2 sits in the driver's seat 3 and project upward from the driver's seat 3.

[0320] According to the transplanter 1 according to this Item 3-8, the support for supporting the antenna unit 400 can be suitably arranged at the rear part of the traveling body 5. (Item 3-9) The transplanter 1 according to Item 8, wherein the one frame member 28CL is arranged on one side in the machine body width direction K2 with respect to the driver's seat 3, and the other frame member 28CR is arranged on the other side in the machine body width direction K2 with respect to the driver's seat 3.

[0321] Also by the transplanter 1 according to this Item 3-9, the support for supporting the antenna unit 400 can be suitably arranged at the rear part of the traveling body 5. (Item 3-10) The transplanter 1 according to any one of Items 3-1 to 3-9, wherein the support has a plurality of spare seedling tables 28A on which the spare seedling trays 8 are placed.

[0322] According to the transplanter 1 according to this item 3-10, the support is the spare seedling table device 28 provided at the rear of the traveling body 5, and the antenna unit 400 can be attached using the spare seedling table device 28, and the structure can be simplified and the cost can be reduced. (Item 3-11) The transplanter 1 according to item 6 or 7, wherein the support is a spare seedling table 28A on which a spare seedling tray 8 is placed, and has a plurality of spare seedling tables 28A attached to the one frame member 28CL and the other frame member 28CR.

[0323] Also according to the transplanter 1 according to this item 3-11, the structure can be simplified and the cost can be reduced. (Item 4-1) A transplanter 1 comprising: a planting work machine 4 for planting seedlings 7 in a field 6; a traveling body 5 that travels with the planting work machine 4 mounted thereon to the rear; a pair of rear spare seedling table devices 28K in the machine body width direction K2 provided at the rear of the traveling body 5; and a connecting member 506 that connects the pair of rear spare seedling table devices 28K to each other.

[0324] According to the transplanter 1 according to this item 4-1, in the transplanter 1 with the planting work machine 4 mounted on the rear of the traveling body 5, by providing the rear spare seedling table device 28K at the rear of the traveling body 5, the efficiency of supplying the seedlings 7 from the spare seedling table device to the planting work machine 4 can be improved. Further, by providing the connecting member 506 that connects the pair of rear spare seedling table devices 28K to each other, the pair of rear spare seedling table devices 28K can reinforce each other and enhance the rigidity. (Item 4-2) The transplanter 1 according to item 4-1, further comprising: a driver's seat 3 mounted on the traveling body 5; and a rear step 33 provided between the driver's seat 3 and the planting work machine 4, wherein one of the rear spare seedling table devices 28K is disposed at one end side in the machine body width direction K2 of the rear step 33, the other rear spare seedling table device 28K is disposed at the other end side in the machine body width direction K2 of the rear step 33, and the connecting member 506 connects the middle portions in the vertical direction of the pair of rear spare seedling table devices 28K.

[0325] According to the transplanter 1 according to this item 4-2, when the operator rides on the rear step 33 and supplies the seedlings 7 placed on the rear spare seedling table device 28K to the planting work machine 4, the connecting member 506 can function as a gripping member, for example, when the operator moves on the rear step 33. (Item 4-3) The pair of rear spare seedling table devices 28K includes a front support member 28C1, a rear support member 28C2 disposed behind the front support member 28C1, and an upper connecting portion 28C3 that connects the upper portions of the front support member 28C1 and the rear support member 28C2. The connecting member 506 connects the rear support member 28C2 of one of the rear spare seedling table devices 28K and the rear support member 28C2 of the other rear spare seedling table device 28K. The transplanter 1 according to item 4-1 or 4-2.

[0326] According to the transplanter 1 according to this item 4-3, when the operator supplies the seedlings 7 to the planting work machine 4 from the rear side of the connecting member 506, it is possible to suppress the connecting member 506 from becoming an obstacle. (Item 4-4) The transplanter 1 according to any one of items 4-1 to 4-3, comprising a driver's seat 3 mounted on the traveling body 5, and the connecting member 506 is disposed at a height position near the upper end of the backrest portion 3B that supports the back of the operator 2 in the driver's seat 3.

[0327] According to the transplanter 1 according to this item 4-4, it can be disposed at a position where the connecting member 506 can function as a gripping member. (Item 4-5) The traveling body 5 has a pair of rear wheels 24 in the machine body width direction K2 provided at the rear of the traveling body 5. One part 33L of the rear step 33 in the machine body width direction K2 is provided above one of the rear wheels 24 so as to protrude outward in the machine body width direction from the one rear wheel 24. The other part 33R of the rear step 33 in the machine body width direction K2 is provided above the other rear wheel 24 so as to protrude outward in the machine body width direction from the other rear wheel 24. The transplanter 1 according to item 4-2.

[0328] According to the transplanter 1 according to this item 4-5, the width in the machine body width direction K2 of the rear step 33 can be widened, and the workability when the operator gets on the rear step 33 and supplies the seedlings 7 placed on the rear spare seedling table device 28K to the planting work machine 4 can be improved. (Item 4-6) The traveling body 5 includes a floor step 29a that forms the floor surface of the driving unit 501 having the driver's seat 3, one side step 507L provided so as to protrude from the floor step 29a to one side in the machine body width direction K2, and the other side step 507R provided so as to protrude to the other side. The one-side part 33L of the rear step 33 is disposed behind the one-side step 507L, and the other-side part 33R of the rear step 33 is disposed behind the other-side step 507R. The transplanter 1 according to Item 5.

[0329] According to the transplanter 1 according to this item 4-6, when the operator 2 moves from the floor step 29a to the rear step 33, the movement can be easily performed. (Item 5-1) A planting work machine 4 for planting seedlings 7 in a field 6, a traveling body 5 that travels with the planting work machine 4 mounted behind it, at least one front spare seedling table device 28F provided on the end side in the machine body width direction K2 at the front of the traveling body 5, and at least one rear spare seedling table device 28K provided on the end side in the machine body width direction K2 behind the front spare seedling table device 28F and at the rear of the traveling body 5. The rear spare seedling table device 28K is disposed outside the machine body width direction than the front spare seedling table device 28F. The transplanter 1.

[0330] According to the transplanter 1 according to this item 5-1, by providing the rear spare seedling table device 28K in addition to the front spare seedling table device 28F, the number of seedlings 7 that can be mounted on the transplanter 1 can be increased, and the working efficiency of the seedling planting work can be improved.

[0331] In addition, in a transplanter 1 in which a planting work implement 4 is attached to the rear of a traveling body 5, when a rear spare seedling table device 28K is provided at the rear of the traveling body 5, there is a possibility that the rear spare seedling table device 28K may interfere with the seedling supply work when supplying the seedlings 7 to the planting work implement 4. According to the transplanter according to Item 5-1, by arranging the rear spare seedling table device 28K outside the machine width direction with respect to the front spare seedling table device 28F, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. (Item 5-2) The front spare seedling table device 28F and the rear spare seedling table device 28K each have a spare seedling table 28A on which a spare seedling tray 8 is placed. The outer end of the spare seedling table 28A of the rear spare seedling table device 28K in the machine width direction K2 is located outside the machine width direction with respect to the outer end of the spare seedling table 28A of the front spare seedling table device 28K in the machine width direction K2. The transplanter 1 according to Item 5-1.

[0332] Also with the transplanter 1 according to this Item 5-2, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. (Item 5-3) The spare seedling table 28A can be changed between a use posture UP1 in which a spare seedling tray 8 is placed and a folded posture UP2 which is a posture erected from the use posture UP1. When the spare seedling tables 28A of the front spare seedling table device 28F and the rear spare seedling table device 28K are in the use posture UP1, the outer end of the spare seedling table 28A of the rear spare seedling table device 28K in the machine width direction K2 is located outside the machine width direction with respect to the outer end of the spare seedling table 28A of the front spare seedling table device 28F in the machine width direction K2. When the spare seedling table 28A of the rear spare seedling table device 28K is in the folded posture UP2, it is located inside the machine width direction with respect to the outer end of the spare seedling table 28A of the front spare seedling table device 28F in the machine width direction K2 which is in the use posture UP1. The transplanter 1 according to Item 5-2.

[0333] Also with the transplanter 1 according to this Item 5-3, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. (Item 5-4) The front spare seedling table device 28F has a frame member 28B to which the spare seedling table 28A is attached, and the rear spare seedling table device 28K has a frame member 28C to which the spare seedling table 28A is attached. The frame member 28B of the front spare seedling table device 28F is provided on the end side in the machine width direction K2 of the traveling body 5, and the frame member 28C of the rear spare seedling table device 28K is arranged and provided on the end side in the machine width direction K2 of the traveling body 5, outward in the machine width direction from the frame member 28B of the front spare seedling table device 28F. The transplanter 1 according to item 5-2 or 5-3.

[0334] Also by the transplanter 1 according to this item 5-4, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. (Item 5-5) It includes a driver's seat 3 mounted on the rear part of the traveling body 5 and a rear step 33 provided between the driver's seat 3 and the planting work machine 4. The planting work machine 4 has a seedling placing table 9 on which a seedling tray 8 is placed. The rear step 33 protrudes outward in the machine width direction from the seedling placing table 9, and the rear spare seedling table device 28K is arranged on the outer end side in the machine width direction K2 of the protruding part. The transplanter 1 according to any one of items 5-1 to 5-4.

[0335] According to the transplanter 1 according to this item 5-5, the workability when an operator gets on the rear step 33 and supplies the seedlings 7 placed on the rear spare seedling table device 28K to the planting work machine 4 can be improved. (Item 5-6) A driver's seat 3 mounted on the rear part of the traveling body 5 and a rear step 33 provided between the driver's seat 3 and the planting work machine 4, the planting work machine 4 having a seedling placing table 9 on which a seedling tray 8 is placed, the plurality of seedling placing tables 9 being arranged side by side in the machine body width direction K2, a part 33L on one side in the machine body width direction K2 of the rear step 33 protruding outward in the machine body width direction from the seedling placing table 9 on the one side in the machine body width direction K2 among the plurality of seedling placing tables 9, and a part 33R on the other side in the machine body width direction K2 of the rear step 33 protruding outward in the machine body width direction from the seedling placing table 9 on the other side in the machine body width direction K2 among the plurality of seedling placing tables 9, the transplanter 1 according to items 5-1 to 5-5.

[0336] Also with the transplanter 1 according to this item 5-6, the workability when an operator gets on the rear step 33 and supplies the seedlings 7 placed on the rear spare seedling table device 28K to the planting work machine 4 can be improved. (Item 5-7) The front spare seedling table device 28F and the rear spare seedling table device 28K are provided on both sides of the traveling body 5 in the machine body width direction K2, one of the rear spare seedling table devices 28K being arranged on the outer end side in the machine body width direction K2 of the part 33L on the one side of the rear step 33, and the other of the rear spare seedling table devices 28K being arranged on the outer end side in the machine body width direction K2 of the part 33R on the other side of the rear step 33, the transplanter 1 according to item 6.

[0337] According to the transplanter 1 according to this item 5-7, it is possible to suppress the rear spare seedling table device 28K from interfering with the seedling supply work. (Item 5-8) The traveling body 5 includes a floor step 29a that forms the floor surface of the driver's cab 501 having the driver's seat 3, a first side step 507L that is provided to protrude from the floor step 29a to one side in the machine width direction K2, and a second side step 507R that is provided to protrude to the other side. A portion 33L on one side of the rear step 33 is disposed behind the first side step 507L, and a portion 33R on the other side of the rear step 33 is disposed behind the second side step 507R. The transplanter 1 according to item 5-6 or 5-7.

[0338] According to the transplanter 1 according to this item 5-8, when the operator 2 moves from the floor step 29a to the rear step 33, the movement can be easily performed. (Item 5-9) The traveling body 5 has a pair of rear wheels 24 in the machine width direction K2 provided at the rear of the traveling body 5. A portion 33L on one side of the rear step 33 is provided above one of the rear wheels 24 so as to protrude outward in the machine width direction from the one rear wheel 24, and a portion 33R on the other side of the rear step 33 is provided above the other rear wheel 24 so as to protrude outward in the machine width direction from the other rear wheel 24. The transplanter 1 according to any one of items 5-6 to 5-8.

[0339] According to the transplanter 1 according to this item 5-9, the width of the rear step 33 in the machine width direction K2 can be increased, and the workability when replenishing the planting work implement 4 with the seedlings 7 can be improved. (Item 6-1) A planting work implement 4 that takes out the seedlings 7 from the seedling tray 8 placed on the seedling placing table 9 and plants them in the field 6, a traveling body 5 that mounts the planting work implement 4 and travels backward, a driver's seat 3 mounted on the traveling body 5, and an empty tray mounting member 510 for mounting the empty seedling tray 8 after the seedlings 7 are taken out. The transplanter 1 in which the empty tray mounting member 510 is disposed on the side of the driver's seat 3.

[0340] According to the transplanter 1 according to this item 6-1, by arranging the empty tray placement member 510 for placing the empty seedling tray 8 after the seedlings 7 are taken out on the side of the driver's seat 3, the empty tray placement operation can be easily performed. (Item 6-2) The transplanter 1 according to item 6-1, wherein the empty tray placement member 510 is arranged at a position where the operator 2 can place the empty seedling tray 8 from the driver's seat 3.

[0341] Also according to the transplanter 1 according to this item 6-2, the empty tray placement operation can be easily performed. (Item 6-3) The traveling body 5 includes a floor step 29a that forms the floor surface of the driving unit 501 having the driver's seat 3, and a side step 507 that is provided to protrude laterally from the floor step 29a. The side step 507 has a rear part 507a located on the side of the driver's seat 3, and the empty tray placement member 510 is arranged above the rear part 507a. The transplanter 1 according to item 6-1 or 6-2.

[0342] According to the transplanter 1 according to this item 6-3, the empty tray placement member 510 can be arranged at a position where the operator 2 can place the empty seedling tray 8 from the driver's seat 3. (Item 6-4) The transplanter 1 according to item 6-3, wherein the empty tray placement member 510 is changeable between a placement posture E1 in which the empty seedling tray 8 can be placed above the rear part 507a and a retracted posture E2 retracted from the upper position of the rear part 507a.

[0343] According to the transplanter 1 according to this item 6-4, when the empty tray placement member 510 is not used, the empty tray placement member 510 can be retracted to a position where it does not get in the way. (Item 6-5) The traveling body 5 includes a rear step 33 provided between the floor step 29a and the planting work machine 4, and a step member 508 provided on a path from the side step 507 to the rear step 33. The step member 508 is disposed behind and above the side step 507 and on the side of the driver's seat 3. The empty tray mounting member 510 is disposed above the rear portion 507a and the step member 508. The transplanter 1 according to item 6-3 or 6-4 as described above.

[0344] Also with the transplanter 1 according to this item 6-5, the empty tray mounting member 510 can be disposed at a position where the operator 2 can place the empty seedling tray 8 from the driver's seat 3. (Item 6-6) The empty tray mounting member 510 is retracted from a position above the rear portion 507a and the step member 508 in the retracted posture E2. The transplanter 1 according to item 5 that cites item 4.

[0345] Also with the transplanter 1 according to this item 6-6, when the empty tray mounting member 510 is not used, it can be retracted to a position where it does not get in the way. (Item 6-7) The empty tray mounting member 510 includes a mounting member main body 514 for mounting the empty seedling tray 8, a support rod 515 that supports the mounting member main body 514 and extends in the front-rear direction, and a rotation prevention structure 516 that prevents rotation around the axis of the support rod 515. Further, the empty tray mounting member 510 can release the rotation prevention of the support rod 515 by the rotation prevention structure 516 so as to change the position of the mounting member main body 514 between the mounting posture E1 and the retracted posture E2. The transplanter 1 according to item 4 as described above.

[0346] According to the transplanter 1 according to this item 6-7, the empty tray mounting member 510 can be easily changed between the mounting posture E1 and the retracted posture E2. (Item 6-8) The transplanter 1 according to item 7, comprising a holding member 517 that holds the placement member main body 514 in the retracted posture E2.

[0347] According to the transplanter 1 according to this item 6-8, when the placement member main body 514 is in the retracted posture E2, it can be held in the retracted posture E2. (Item 6-9) The transplanter 1 according to any one of items 6-1 to 6-8, comprising a pressing member 511 that presses the empty seedling tray 8 placed on the empty tray placement member 510.

[0348] According to the transplanter 1 according to this item 6-9, it is possible to prevent the seedling tray 8 placed on the empty tray placement member 510 from coming off the empty tray placement member 510 due to wind or the like. (Item 6-10) The transplanter 1 according to item 6-9, comprising a support member 512 that supports the pressing member 511 so as to be movable in the vertical direction, and a biasing member 513 that biases the pressing member 511 downward.

[0349] According to the transplanter 1 according to this item 6-10, by moving the pressing member 511 upward, the placement of the seedling tray 8 on the empty tray placement member 510 can be easily performed, and the biasing member 513 can firmly press the seedling tray 8 placed on the empty tray placement member 510. (Item 6-11) The pressing member 511 has a vertical rod portion 511a extending in the vertical direction and a horizontal rod portion 511b extending forward from the lower end of the vertical rod portion 511a. Further, the pressing member 511 has a pressing posture E3 in which the horizontal rod portion 511b presses the empty seedling tray 8, and by rotating the vertical rod portion 511a around its axis, the horizontal rod portion 511b is in a posture in which it has moved to a position where the empty seedling tray 8 placed on the empty tray placement member 510 can be taken out, which is a tray take-out posture E4. The transplanter 1 according to item 6-9 can be freely changed between these postures.

[0350] According to the transplanter 1 related to this item 6-11, by setting the pressing member 511 to the tray removal posture E4, the work of removing the seedling tray 8 stacked on the empty tray placement member 510 becomes easier.

[0351] As described above, although one embodiment of the present invention has been described, it should be considered that the disclosed embodiment is illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of reference numerals

[0352] 1 Transplanter 2 Operator 3 Driver's seat 3B Backrest part 4 Planting work implement 5 Traveling body 6 Field 7 Seedling 24 Rear wheel 28C1 Front support member 28C2 Rear support member 28C3 Upper connecting part 28K Rear spare seedling table device 29a Floor step 33 Rear step 33L One side part 33R The other side part 501 Driving part 506 Connecting member 507L One side step 507R The other side step K2 Machine body width direction

Claims

1. A planting work machine for planting seedlings in a field, A traveling body that mounts the planting work machine at the rear and travels, A pair of rear spare seedling table devices on both sides in the machine width direction provided at the rear of the traveling body, A connecting member that connects the pair of rear spare seedling table devices, A transplanter equipped with

2. A driver's seat mounted on the traveling body, A rear step provided between the driver's seat and the planting work machine, Equipped with One of the rear spare seedling table devices is arranged on one end side in the machine width direction of the rear step, The other rear spare seedling table device is arranged on the other end side in the machine width direction of the rear step, The connecting member connects the middle parts in the vertical direction of the pair of rear spare seedling table devices. The transplanter according to claim 1.

3. The pair of rear spare seedling table devices has a front support member, a rear support member arranged behind the front support member, and an upper connecting part that connects the upper parts of the front support member and the rear support member, The connecting member connects the rear support member of one of the rear spare seedling table devices and the rear support member of the other rear spare seedling table device. The transplanter according to claim 1 or 2.

4. Equipped with a driver's seat mounted on the traveling body, The connecting member is arranged at a height position near the upper end of the backrest part that supports the back of the operator in the driver's seat. The transplanter according to claim 1 or 2.

5. The traveling body has a pair of rear wheels on both sides in the machine width direction provided at the rear of the traveling body, One part on one side in the machine width direction of the rear step is provided above one of the rear wheels so as to protrude outward in the machine width direction from the one rear wheel, The other part on the other side in the machine width direction of the rear step is provided above the other rear wheel so as to protrude outward in the machine width direction from the other rear wheel. The transplanter according to claim 2.

6. The traveling body has a floor step that forms the floor surface of the driving part having the driver's seat, and one side step provided so as to protrude from the floor step to one side in the machine width direction and the other side step provided so as to protrude to the other side, One part on one side of the rear step is arranged behind the one side step, The other part on the other side of the rear step is arranged behind the other side step. The transplanter according to claim 5.

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