Ride-type rice transplanter

Abstract

To constitute so that a worker standing on a ridge can perform easily a work for supplying seedlings to a spare seedling tray, in a sulky rice transplanter.SOLUTION: A sulky rice transplanter includes a support frame provided on the front of a machine body, and a spare seedling tray 12 supported by the support frame, and having a seedling placing part 32 where a seedling is placed. A front guide member 38 capable of guiding a seedling from the front to the seedling placing part 32 is provided on the front end of the spare seedling tray 12 so as to be arranged on a higher position than the seedling placing part 32.SELECTED DRAWING: Figure 14

Description

Technical Field

[0001] The present invention relates to a riding rice transplanter provided with a seedling stand for spare seedlings at the front part of the machine body.

Background Art

[0002] In the riding rice transplanter disclosed in Patent Document 1, a seedling stand for spare seedlings is supported along the front-rear direction on a support frame provided at the front part of the machine body. When replenishing seedlings from the paddy field ridge to the seedling stand for spare seedlings, in a state where the front part of the machine body is positioned in contact with the paddy field ridge, a worker standing on the ridge replenishes the seedlings so as to feed them into the seedling stand for spare seedlings from the front part of the seedling stand for spare seedlings.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the paddy field ridge is located at a position higher than the field surface, when a worker standing on the paddy field ridge replenishes the seedlings to the seedling stand for spare seedlings of the riding rice transplanter, the worker standing on the paddy field ridge is in a state of feeding the seedlings obliquely downward from obliquely upward and forward with respect to the front part of the seedling stand for spare seedlings. An object of the present invention is to configure a riding rice transplanter so that it is easier for a worker standing on a paddy field ridge to replenish seedlings to the seedling stand for spare seedlings.

Means for Solving the Problems

[0005] The riding rice transplanter of the present invention includes a support frame provided at the front part of the machine body, and a seedling stand for spare seedlings supported by the support frame and having a seedling placement part on which seedlings are placed, and a front guide member capable of guiding the seedlings to the seedling placement part from the front is provided at the front end part of the seedling stand for spare seedlings so as to be disposed at a position higher than the seedling placement part. The seedling placement part is a plurality of support rollers that are rotatably supported around an axis along the left-right direction and arranged side by side along the front-rear direction. Among the plurality of support rollers, in a first support roller closest to the front guide member and a second support roller adjacent to the rear side of the first support roller, a distance in the front-rear direction between the first support roller and the second support roller is set to be smaller than a distance in the front-rear direction between the front guide member and the first support roller.

[0006] According to the present invention, when a worker standing on a ridge supplies seedlings to the seedling stand of a riding rice transplanter, the worker standing on the ridge may feed the seedlings obliquely downward while placing the seedlings on the front guide member. In the seedling stand, the front guide member is provided at the front of the seedling stand and is disposed at a position higher than the seedling placement portion of the seedling stand.

[0007] Thus, when the seedlings are fed obliquely downward as described above, the seedlings are stably supported by the front guide member in a posture of facing obliquely downward, so that the seedlings are guided from the front guide member to the seedling placement portion. Therefore, it becomes easier for the worker standing on the ridge to supply seedlings to the seedling stand of the riding rice transplanter, and the workability of seedling supply can be improved. After the seedlings are placed on the seedling stand, the front guide member also functions as a stopper for preventing the seedlings from falling forward from the front of the seedling stand. According to the present invention, when the seedling is guided from the front guide member to the seedling placement part as described above, the seedling placement part is a plurality of support rollers, and as the support rollers rotate with the feeding of the seedling, the seedling is smoothly fed from the front guide member to the support rollers, which is advantageous in terms of improving the workability of seedling replenishment. In a first support roller closest to the front guide member and a second support roller adjacent to the rear side of the first support roller, as described above, the seedling is fed obliquely downward, and when the seedling is guided from the front guide member to the first support roller, the front end portion of the seedling may enter between the first and second support rollers. According to the present invention, since the distance in the front-rear direction between the first support roller and the second support roller is set to be relatively small, when the seedling is guided from the front guide member to the first support roller, the possibility that the front end portion of the seedling enters between the first and second support rollers is reduced, and the front end portion of the seedling is more easily guided from the first support roller to the second support roller.

[0008] In the present invention, it is preferable that the front guide member is a front guide roller that is rotatable around a front axis along the left-right direction.

[0009] According to the present invention, when the seedlings are placed on the front guide roller and guided to the seedling placement portion, the front guide roller rotates as the seedlings are fed, so that the seedlings are smoothly guided from the front guide roller to the seedling placement portion. Therefore, it is advantageous in terms of improving the workability of seedling supply.

[0010]

[0011]

[0012]

[0013]

[0014]

[0015] In the present invention, it is preferable that a virtual line connecting the upper end portion of the front guide member and the upper end portion of the first support roller overlaps with the second support roller in a side view.

[0016] According to the present invention, when the seedling is guided from the front guide member to the first support roller and then from the first support roller to the second support roller, the front end portion of the seedling is likely to hit the second support roller. Due to the rotation of the second support roller, the front end portion of the seedling becomes more likely to rest on the second support roller. As a result, the possibility of the front end portion of the seedling getting caught between the first and second support rollers is reduced.

[0017] In the present invention, it is preferable that in a side view, the virtual line is located above the axis of the second support roller.

[0018] According to the present invention, when the seedling is guided from the front guide member to the first support roller and then from the first support roller to the second support roller, and the front end portion of the seedling hits the second support roller, the front end portion of the seedling is more likely to hit above the axis of the second support roller. Due to the rotation of the second support roller, the front end portion of the seedling becomes even more likely to rest on the second support roller. As a result, the possibility of the front end portion of the seedling getting caught between the first and second support rollers is reduced.

[0019] In the present invention, among the plurality of support rollers, it is preferable that the distance in the front - rear direction between the support rollers other than the first support roller and the second support roller is set to be larger than the distance in the front - rear direction between the first support roller and the second support roller.

[0020] The seedling guided from the front guide member to the first and second support rollers is then smoothly guided to the rear support rollers without difficulty. Therefore, the possibility of the front end portion of the seedling getting caught between the rear support rollers is small, and there is no need to reduce the distance in the front - rear direction between the rear support rollers. According to the present invention, the distance in the front-rear direction of the support rollers other than the first and second support rollers is set to be relatively large, and it is not necessary to provide an excessive number of support rollers, which is advantageous in terms of simplifying the structure.

[0021] According to the present invention, since the distance in the front-rear direction of the support rollers other than the first and second support rollers is set to be relatively large, for example, when rolling a mat-shaped seedling into a roll and placing it on the preliminary seedling placing table, the rolled seedling can be placed so as to fall, for example, between adjacent support rollers, and the rolled seedling can be stably placed on the preliminary seedling placing table.

[0022] In the present invention, it is preferable that the rear guide member is provided at the rear end portion of the preliminary seedling placing table so as to be disposed at a position higher than the seedling placing portion.

[0023] According to the present invention, after the seedling is placed on the preliminary seedling placing table, when an operator boarding the machine body takes out the seedling obliquely upward and rearward from the rear portion of the preliminary seedling placing table, the seedling is guided obliquely upward and rearward by the rear guide member, so that it becomes easier to take out the seedling from the preliminary seedling placing table. After the seedling is placed on the preliminary seedling placing table, the rear guide member also functions as a stopper for preventing the seedling from falling backward from the rear portion of the preliminary seedling placing table.

Brief Description of the Drawings

[0024]

Figure 1

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Figure 17

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Figure 24

Embodiments for Carrying Out the Invention

[0025] In FIGS. 1 to 24, a riding rice transplanter equipped with a stand for preliminary seedlings is shown. In FIGS. 1 to 24, F indicates the forward direction, B indicates the rearward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0026] (Overall Configuration of the Riding Rice Transplanter) As shown in FIGS. 1 and 2, the body 3 is supported by the right and left front wheels 1 and the right and left rear wheels 2, and a seedling planting device 4 for planting seedlings on the paddy field is supported at the rear part of the body 3 so as to be capable of lifting and lowering operations.

[0027] A floor 5 is provided on the body 3, a step 6 is provided at the rear part of the body 3 so as to be arranged at a position higher than the floor 5, and a driver's seat 7 is provided at the front part of the step 6. A fertilizer application device 8 for supplying fertilizer to the paddy field is provided at the rear part of the step 6 so as to be arranged at a position higher than the step 6.

[0028] A bonnet 9 for accommodating an engine (not shown) is provided at the front position of the driver's seat 7 and at the left and right center position of the front part of the floor 5, and a steering handle 10 for steering the front wheels 1 is provided at the rear part of the bonnet 9. The right and left frames 14 for handrails are connected to the body 3 and extend upward through the right lateral outer side and the left lateral outer side of the step 6. A frame 15 is connected along the left - right direction across the right and left frames 14.

[0029] (Configuration of the Support Frame for the Stand of Preliminary Seedlings) As shown in FIGS. 1 and 2, the right and left support frames 17 are connected to the right and left parts of the front lower part of the body 3, and extend upward from the right lateral outer side and the left lateral outer side of the right front part and the left front part of the floor 5. A support frame 20 is connected along the left - right direction across the upper parts of the right and left support frames 17.

[0030] The right and left support frames 16 are connected to the right and left parts of the front lower part of the machine body 3, extend upward from the lateral outer sides of the right front part and the left front part of the floor 5, and the upper parts of the support frames 16 are connected to the upper parts of the support frames 17. The right and left support frames 18 and 19 are connected to the right and left parts of the front lower part of the machine body 3 and extend upward from the lateral outer sides of the right front part and the left front part of the floor 5.

[0031] The right and left lights 27 for illuminating the front are attached to the support frame 16. The right and left spare seedling stands 24 on which one mat-shaped seedling can be placed are attached to the upper parts of the support frames 16 and 17. As described above, the support frames 16 to 20 are provided at the front part of the machine body 3.

[0032] As shown in FIGS. 1 to 4, a spare seedling stand 11 which is the right and left first spare seedling stands, a spare seedling stand 12 which is the right and left second spare seedling stands, and a spare seedling stand 13 which is the right and left third spare seedling stands are provided.

[0033] As described in (the overall configuration of the first spare seedling stand) to be described later, the spare seedling stand 11 is supported by the support frames 16 to 20. As described in (the configuration regarding the support of the second spare seedling stand) (the configuration regarding the support of the third spare seedling stand) to be described later, the spare seedling stand 12 is supported by the support frames 16 to 20 via the spare seedling stand 11, and the spare seedling stand 13 is supported by the support frames 16 to 20 via the spare seedling stand 11.

[0034] (The overall configuration of the first spare seedling stand) As shown in FIGS. 5 and 6, the spare seedling stand 11 has a right frame 21 which is one frame, a left frame 21 which is the other frame, a plurality of support rollers 31 which are the seedling placement parts, right and left first fulcrum parts 41, right and left fulcrum parts 43, right and left first contact parts 51, a first horizontal frame 61, and a horizontal frame 63.

[0035] The right and left first fulcrum portions 41 are connected to the front end portion, which is the end portion of the frame 21 in the front-rear direction. The right and left first contact portions 51 are connected to the first fulcrum portions 41, and the first contact portions 51 are connected to the front end portion of the frame 21 via the first fulcrum portions 41. The first horizontal frame 61 is connected across the right and left first fulcrum portions 41, and the first horizontal frame 61 is connected along the left-right direction to the front end portions of the right and left frames 21 via the first fulcrum portions 41.

[0036] The right and left fulcrum portions 43 are connected to the rear end portion, which is the end portion of the frame 21 in the front-rear direction. The horizontal frame 63 is connected across the right and left fulcrum portions 43, and the horizontal frame 63 is connected along the left-right direction to the rear end portions of the right and left frames 21 via the fulcrum portions 43. The overall rigidity of the seedling stand 11 for spare seedlings is ensured by the right and left frames 21, the first horizontal frame 61, and the horizontal frame 63.

[0037] A plurality of support rollers 31 are supported across the right frame 21 and the left frame 21 so as to be rotatable around an axis P1 along the left-right direction, which is a direction orthogonal to the longitudinal direction of the frame 21.

[0038] The support rollers 31 are arranged side by side in the front-rear direction and are supported by the right frame 21 and the left frame 21 with a space therebetween in the front-rear direction such that a gap C1 is formed between adjacent support rollers 31. The length (interval) L1 in the front-rear direction of the gap C1, which is the interval between adjacent support rollers 31, is set to be larger than the outer diameter D1 of the support rollers 31.

[0039] In the right and left pre-seedling stands 11 configured as described above, in the right pre-seedling stand 11, the right frame 21 is supported on the upper parts of the support frames 18 and 19, and the left frame 21 is supported by the support frames 16 and 17. In the left pre-seedling stand 11, the right frame 21 is supported by the support frames 16 and 17, and the left frame 21 is supported on the upper parts of the support frames 18 and 19. Thus, the pre-seedling stand 11 is supported by the support frames 16 to 20.

[0040] As shown in FIG. 4, a mat-shaped seedling E formed by rolling a roll-shaped seedling E tied with a string, a band, or the like can be placed so as to drop into the gaps C1, C2, and C3 between the adjacent support rollers 31, 32, and 33. Between the roll-shaped seedlings E placed on the support rollers 31, 32, and 33, roll-shaped seedlings E can be placed so as to be stacked. Thus, the roll-shaped seedlings E are positioned by the right and left frames 21, 22, 23 and the support rollers 31, 32, 33 adjacent in the front-rear direction, and are stably placed on the pre-seedling stands 11, 12, and 13 without rolling.

[0041] (Configuration of the frame in the first pre-seedling stand) As shown in FIGS. 7 to 10, the frame 21 is formed of an aluminum material and is provided with a flat plate portion 28 and a hollow portion 29.

[0042] The flat plate portion 28 is flat in a cross-sectional view along the vertical direction and extends along the front-rear direction, which is the longitudinal direction of the frame 21 (seedling placement portion) in a side view. An opening 28a for attaching the support roller 31 and a long hole 28b along the front-rear direction, which is a position adjustment portion, are opened in the flat plate portion 28.

[0043] As described in the above (overall configuration of the first preliminary seedling stand), when the frame 21 is attached to the support frames 16 to 19, the bolt 30 (see FIGS. 3 and 8) is passed through the long hole 28b of the flat plate portion 28, and the flat plate portion 28 is attached to the support frames 16 to 19. Thereby, the attachment position of the preliminary seedling stand 11 in the support frames 16 to 19 can be adjusted in the front-rear direction by the long hole 28b of the flat plate portion 28.

[0044] The hollow portion 29 is in a hollow shape having a width larger than that of the flat plate portion 28 in a cross-sectional view, and is connected to the upper and lower portions of the flat plate portion 28, and extends along the front-rear direction which is the longitudinal direction of the frame 21 (seedling placement portion) in a side view.

[0045] The portion 29a of the hollow portion 29 facing the central portion of the support roller 31 (seedling placement portion) is formed in a straight line along the vertical direction in a cross-sectional view. The portion 29b of the hollow portion 29 on the side opposite to the central portion of the support roller 31 (seedling placement portion) is formed in an arc shape protruding toward the side opposite to the central portion of the support roller 31 (seedling placement portion), and the hollow portion 29 is formed in a quarter-circle shape in a cross-sectional view.

[0046] With the above configuration, the frame 21 has an up-down symmetric shape, and the right and left frames 21 are the same. The right and left frames 21 are arranged such that the portions 29a of the hollow portions 29 of the right and left frames 21 face each other (face the central portion of the support roller 31).

[0047] (Configuration of the support roller in the first preliminary seedling stand) As shown in FIGS. 9 to 12, the support roller 31 is formed in a cylindrical shape from an aluminum material, and one and the other ends are open. A support shaft 34 for supporting the support roller 31, right and left bearings 35, and right and left bearing holders 36 are provided.

[0048] The support shaft 34 is composed of a round pipe. A flat plate-like portion 34a is formed at one end of the support shaft 34, and the other end 34b of the support shaft 34 is cylindrical. A bearing 35 is attached to the outer surface of the support shaft 34 from the end 34b of the support shaft 34.

[0049] The bearing holder 36 is configured to be split into two semi-ring shapes by synthetic resin, and has a semi-cylindrical holder portion 36a, a plurality of convex portions 36b provided on the outer surface of the holder portion 36a, and a flange portion 36c provided at the end of the holder portion 36a.

[0050] In the bearing holder 36, the end of the convex portion 36b is located at a portion that is separated by a predetermined length from the flange portion 36c, which is the end of the bearing holder 36 on the side opposite to the insertion side into the support roller 31, toward the side opposite to the flange portion 36c on the insertion side into the support roller 31.

[0051] In the bearing holder 36, the convex portion 36b is formed from the aforementioned portion toward the end of the bearing holder 36 on the insertion side into the support roller 31. As a result, on the outer surface of the holder portion 36a of the bearing holder 36, there is a portion 36d where the convex portion 36b is not provided between the convex portion 36b and the flange portion 36c.

[0052] With the above configuration, the holder portion 36a of the split bearing holder 36 is attached to the outer surface of the bearing 35, and the bearing holder 36 is press-fitted into the end of the support roller 31. As the bearing holder 36 is press-fitted into the end of the support roller 31, the convex portion 36b of the bearing holder is strongly pressed against the inner surface of the support roller 31 while being scraped by the end of the support roller 31.

[0053] Before the flange portion 36c of the bearing holder 36 reaches the end of the support roller 31 (shortly before the press-fitting of the bearing holder 36 into the end of the support roller 31 is completed), the portion 36d where the convex portion 36b of the bearing holder 36 is not provided reaches the end of the support roller 31, so that it becomes difficult for chips to be generated.

[0054] When the flange portion 36c of the bearing holder 36 reaches the end of the support roller 31, the press-fitting of the bearing holder 36 onto the end of the support roller 31 is completed. Thereby, the support roller 31 is rotatably supported by the support shaft 34 via the bearing 35 and the bearing holder 36.

[0055] (Configuration of support of support roller in the first preliminary seedling stage stand) In the support roller 31 and the support shaft 34 configured as described in the above (Configuration of support roller in the first preliminary seedling stage stand), as shown in FIGS. 9 to 12, a bearing portion 37 for supporting one part and the other part of the support shaft 34 is provided.

[0056] The bearing portion 37 is integrally formed of synthetic resin and has a main body portion 37a, a mounting portion 37b, an engaging portion 37c, a shaft insertion portion 37d, a groove portion 37e which is an anti-rotation portion, a positioning portion 37f, and the like.

[0057] In the bearing portion 37, the main body portion 37a is formed in a square shape (quadrilateral shape) in side view. The mounting portion 37b is formed in an octagonal shape (polygonal shape) in side view and is attached to the main body portion 37a. A pair of claw-shaped engaging portions 37c are attached to the main body portion 37a so as to be located on both sides of the mounting portion 37b. A hole-shaped shaft insertion portion 37d is formed from the main body portion 37a to the mounting portion 37b, and a groove portion 37e and a positioning portion 37f are provided in the inner back portion of the shaft insertion portion 37d.

[0058] In the frame 21 (flat plate portion 28 and hollow portion 29) and the bearing portion 37, the mounting portion 37b and the engaging portion 37c of the bearing portion 37 are inserted into the opening 28a of the flat plate portion 28. Until the main body portion 37a of the bearing portion 37 comes into contact with the flat plate portion 28, when the mounting portion 37b and the engaging portion 37c of the bearing portion 37 are inserted into the opening 28a of the flat plate portion 28, the engaging portion 37c of the bearing portion 37 engages with the edge of the opening 28a of the flat plate portion 28, and the mounting portion 37b of the bearing portion 37 is prevented from falling off from the opening 28a of the flat plate portion 28.

[0059] At the same time, the main body 37a of the bearing portion 37 enters between the upper and lower hollow portions 29, the upper side portion of the main body 37a of the bearing portion 37 contacts the lower side portion of the upper hollow portion 29, and the lower side portion of the main body 37a of the bearing portion 37 contacts the upper side portion of the lower hollow portion 29, so that a rotation prevention for stopping the rotation around the axis P1 of the bearing portion 37 is performed. Thereby, the bearing portion 37 is attached to the flat plate portion 28 of the frame 21.

[0060] Insert the flat plate-shaped portion 34a of the support shaft 34 into the shaft insertion portion 37d of the bearing portion 37 attached to one of the right and left frames 21, insert it into the groove portion 37e of the bearing portion 37, and abut it against the inner back portion of the groove portion 37e of the bearing portion 37. Insert the end portion 34b of the support shaft 34 into the shaft insertion portion 37d of the bearing portion 37 attached to the other of the right and left frames 21, and abut it against the positioning portion 37f of the bearing portion 37.

[0061] Thereby, one part and the other part of the support shaft 34 are supported by the bearing portion 37, and the support roller 31 is rotatably attached across the flat plate portions 28 of the right and left frames 21 around the axis P1 orthogonal to the longitudinal direction of the frame 21. The upper end portion of the support roller 31 is located below the upper end portions of the right frame 21 and the left frame 21.

[0062] The rotation prevention for stopping the rotation around the axis P1 of the support shaft 34 is performed by the groove portion 37e of the bearing portion 37. The position in the direction of the axis P1 of the support shaft 34 is determined by the groove portion 37e of one bearing portion 37 and the positioning portion 37f of the other bearing portion 37.

[0063] (Overall configuration of the second seedling placing table) As shown in FIGS. 13 and 14, the preliminary seedling placing table 12 includes a right frame 22 which is one frame, a left frame 22 which is the other frame, a plurality of support rollers 32 which are seedling placement portions, right and left second fulcrum portions 42, right and left second abutting portions 52, a front guide roller 38 which is a front guide member, a locking portion 39, and a second horizontal frame 62 and a horizontal frame 64.

[0064] The right and left second fulcrum portions 42 are connected to the rear end portion which is the end portion of the frame 22 in the front-rear direction. The right and left second contact portions 52 are connected to the second fulcrum portions 42, and the second contact portions 52 are connected to the rear end portion of the frame 22 via the second fulcrum portions 42. The second horizontal frame 62 is connected across the right and left second fulcrum portions 42, and the second horizontal frame 62 is connected along the left-right direction to the rear end portions of the right and left frames 22 via the second fulcrum portions 42.

[0065] The right and left support portions 44 are connected to the front end portion which is the end portion of the frame 22 in the front-rear direction. The horizontal frame 64 is connected across the right and left support portions 44, and the horizontal frame 64 is connected along the left-right direction to the front end portions of the right and left frames 22 via the support portions 44. The locking portion 39 formed in a channel shape in plan view is connected to the front portion of one of the frames 22. The overall rigidity of the spare seedling placing table 12 is ensured by the right and left frames 22, the second horizontal frame 62, and the horizontal frame 64.

[0066] In the spare seedling placing table 12, the frame 22 includes a flat plate portion 28 and upper and lower hollow portions 29, similar to the frame 21 of the spare seedling placing table 11 (refer to the (configuration of the frame in the first spare seedling placing table) and FIGS. 7 to 12 described above). In this case, the frame 22 does not include the elongated hole 28b in the flat plate portion 28.

[0067] The spare seedling placing table 12 includes the same support rollers 32 as the support rollers 31 of the spare seedling placing table 11, and includes the support shaft 34, bearing 35, bearing holder 36, and bearing portion 37 described in the above (configuration of the support rollers in the first spare seedling placing table) (configuration of the support of the support rollers in the first spare seedling placing table). Similar to the spare seedling placing table 11, the support rollers 32 are rotatably attached around the axis P2 along the left-right direction which is the direction orthogonal to the longitudinal direction of the frame 22, across the flat plate portions 28 of the right and left frames 22.

[0068] (Configuration of the front guide roller on the second spare seedling stage) As shown in FIGS. 13 and 14, a front guide roller 38 having a length extending across the right and left frames 22 is supported across the upper portions of the right and left support portions 44 so as to be rotatable about a shaft center P4 which is a front shaft center and is an axis along the left-right direction which is a direction orthogonal to the longitudinal direction of the frame 22.

[0069] The front guide roller 38 is disposed at a position higher than the support roller 32 (seedling placement portion) and is provided at the front end portion of the spare seedling stage 12 so as to be disposed at a position higher than the frame 22 (upper hollow portion 29).

[0070] (Positional relationship between the front guide roller and the support roller on the second spare seedling stage) As shown in FIGS. 13 and 14, the support rollers 32 are arranged side by side along the front-rear direction, and are supported by the right frame 22 and the left frame 22 with a gap C2 formed between the front guide roller 38 and the support rollers 32 and between adjacent support rollers 32 in the front-rear direction.

[0071] Among the plurality of support rollers 32, in the first support roller 32(1) closest to the front guide roller 38 and the second support roller 32(2) adjacent to the rear side of the first support roller 32(1), the length (interval) L21 of the gap C2 which is the front-rear direction interval between the front guide roller 38 and the first support roller 32(1) is set to be sufficiently large.

[0072] The length (interval) L22 of the gap which is the front-rear direction interval between the first support roller 32(1) and the second support roller 32(2) is set to be sufficiently small. Thereby, the length (interval) L22 is set to be smaller than the length (interval) L21.

[0073] When a virtual line K1 connecting the upper end of the front guide roller 38 and the upper end of the first support roller 32(1) is assumed in a side view, the virtual line K1 overlaps with the second support roller 32(2) in the side view and is located above the axis P2 of the second support roller 32(2) in the side view.

[0074] Regarding the second support roller 32(2), in the third support roller 32(3), the fourth support roller 32(4), and the fifth support roller 32(5) adjacent to the rear side, there is a length (interval) L23 in the gap C2 which is the front-rear direction interval between the second support roller 32(2) and the third support roller 32(3). There is a length (interval) L24 in the gap C2 which is the front-rear direction interval between the third support roller 32(3) and the fourth support roller 32(4). There is a length (interval) L25 in the gap C2 which is the front-rear direction interval between the fourth support roller 32(4) and the fifth support roller 32(5).

[0075] The length (interval) L23 is set to be larger than the length (interval) L22, the length (interval) L24 is set to be larger than the length (interval) L23, and the length (interval) L25 is set to be larger than the length (interval) L24, and the lengths (intervals) L22, L23, L24, L25 are increasing in order.

[0076] The length (interval) L21 is set to be larger than the lengths (intervals) L22, L23, L24, L25, and the lengths (intervals) L21, L23, L24, L25 are set to be larger than the outer diameter D2 of the support roller 32. The length (interval) L22 is set to be approximately the same as the outer diameter D2 of the support roller 32 or slightly smaller than the outer diameter D2 of the support roller 32.

[0077] As a result, among the plurality of support rollers 32, the lengths (intervals) L23, L24, L25 of the gaps C2 of the support rollers 32(3)(4)(5) other than the first support roller 32(1) and the second support roller 32(2) are set to be larger than the length (interval) L22 of the gap C2 of the first support roller 32(1) and the second support roller 32(2).

[0078] As described above (the overall configuration of the first seedling stage) and as shown in FIG. 4, a roll-shaped seedling E can be placed in the same manner as the seedling stage 11 so as to drop between the front guide roller 38 and the support roller 32 (gap C2) and between adjacent support rollers 32 (gap C2).

[0079] (Configuration regarding support of the second seedling stage) As shown in FIGS. 3 and 4, the first fulcrum portion 41 of the seedling stage 11 and the second fulcrum portion 42 of the seedling stage 12 are swingably connected, and the seedling stage 12 is swingably supported around the first support axis P11 which is the support axis along the left-right direction at the front part of the seedling stage 11.

[0080] Thereby, the front and rear ends of the right frame 21 and the left frame 21 in the first seedling stage 11 and the front and rear ends of the right frame 22 and the left frame 22 in the second seedling stage 12 are swingably supported around the first support axis P11 which is the support axis along the left-right direction.

[0081] Since the seedling stage 12 is swingably supported around the first support axis P11 at the front part of the seedling stage 11, the seedling stage 12 can be changed in posture between a working posture A11 which is a first working posture extending forward from the front part of the seedling stage 11 so as to be continuous with the seedling stage 11, and a storage posture A21 which is a first storage posture folded upward from the front part of the seedling stage 11.

[0082] In a state where the seedling stage 12 is operated to the working posture A11, the first contact portion 51 of the seedling stage 11 and the second contact portion 52 of the seedling stage 12 come into contact with each other, whereby the seedling stage 12 is set (maintained) in the working posture A11.

[0083] If no seedling E is placed on the spare seedling stand 12 operated in the working position A11, the spare seedling stand 12 is set (maintained) in the working position A11 by the contact between the first contact portion 51 and the second contact portion 52. The first horizontal frame 61 (see FIG. 5) of the spare seedling stand 11 and the second horizontal frame 62 (see FIG. 13) of the spare seedling stand 12 are close to each other, but there is a slight gap between the first horizontal frame 61 and the second horizontal frame 62.

[0084] When a seedling E is placed on the spare seedling stand 12 operated in the working position A11 and the spare seedling stand 12 attempts to displace downward, the first horizontal frame 61 and the second horizontal frame 62 come into contact along substantially the entire length in the left - right direction. As a result, due to the contact between the first contact portion 51 and the second contact portion 52, and the contact between the first horizontal frame 61 and the second horizontal frame 62, the downward displacement of the spare seedling stand 12 is stopped, and the spare seedling stand 12 is set (maintained) in the working position A11.

[0085] As shown in FIGS. 1 and 3, the front holding portion 25 is provided at a portion above the spare seedling stand 11 in the support frame 16 and at a lower portion from the spare seedling stand 24. By operating the spare seedling stand 12 to the storage position A21 and holding the locking portion 39 of the spare seedling stand 12 by the front holding portion 25, the spare seedling stand 12 can be held in the storage position A21. By releasing the holding of the front holding portion 25, the spare seedling stand 12 can be operated to the working position A11.

[0086] (Overall structure of the third spare seedling stand) As shown in FIGS. 15 and 16, the spare seedling stand 13 has a right frame 23 which is one frame, a left frame 23 which is the other frame, a plurality of support rollers 33 which are seedling placement portions, right and left fulcrum portions 45, right and left engaging portions 46, a locking portion 40, and horizontal frames 65, 66.

[0087] The right and left fulcrum portions 45 are connected to the front end portion which is the end portion of the frame 23 in the front-rear direction, the horizontal frame 65 is connected across the right and left fulcrum portions 45, and the horizontal frame 65 is connected along the left-right direction to the front end portions of the right and left frames 23 via the fulcrum portions 45.

[0088] The right and left engaging portions 46 are connected to the rear end portion which is the end portion of the frame 23 in the front-rear direction, the horizontal frame 66 is connected across the right and left engaging portions 46, and the horizontal frame 66 is connected along the left-right direction to the rear end portions of the right and left frames 23 via the engaging portions 46. The locking portion 40 formed in a channel shape in plan view is connected to the rear portion of one of the frames 23. The overall rigidity of the spare seedling placing table 13 is ensured by the right and left frames 23, the horizontal frame 65, and the horizontal frame 66.

[0089] In the spare seedling placing table 13, the frame 23 includes a flat plate portion 28 and upper and lower hollow portions 29, similar to the frame 21 of the spare seedling placing table 11 (refer to (the configuration of the frame in the first spare seedling placing table) and FIGS. 7 to 12 described above). In this case, the frame 23 does not have the long hole 28b in the flat plate portion 28.

[0090] The spare seedling placing table 13 is provided with the same support rollers 33 as the support rollers 31 of the spare seedling placing table 11, and includes the support shaft 34, the bearing 35, the bearing holder 36, and the bearing portion 37 described in (the configuration of the support rollers in the first spare seedling placing table) (the configuration of the support of the support rollers in the first spare seedling placing table). Similar to the spare seedling placing table 11, the support rollers 33 are rotatably attached across the flat plate portions 28 of the right and left frames 23 around the axis P3 along the left-right direction which is the direction orthogonal to the longitudinal direction of the frame 23.

[0091] The support rollers 33 are arranged side by side along the front-rear direction, and are spaced apart from each other in the front-rear direction so that a gap C3 is formed between adjacent support rollers 33, and are supported by the right frame 23 and the left frame 23. The length (spacing) L3 in the front-rear direction of the gap C3, which is the spacing between adjacent support rollers 33, is set to be larger than the outer diameter D3 of the support rollers 33.

[0092] As described above (the overall configuration of the first seedling stand) and as shown in FIG. 4, a roll-shaped seedling E can be placed in the same manner as the seedling stand 11 so as to drop between adjacent support rollers 33 (gap C3).

[0093] (Configuration regarding support of the third seedling stand) As shown in FIGS. 3 and 4, the fulcrum portion 43 of the seedling stand 11 and the fulcrum portion 45 of the seedling stand 13 are swingably connected, and the seedling stand 13 is swingably supported around the second support axis P21 along the left-right direction at the rear part of the seedling stand 11.

[0094] Thereby, the front-rear ends of the right frame 21 and the left frame 21 in the front-rear direction of the first seedling stand 11 and the front-rear ends of the right frame 23 and the left frame 23 in the front-rear direction of the third seedling stand 13 are swingably supported around the second support axis P21 along the left-right direction.

[0095] Since the seedling stand 13 is swingably supported around the second support axis P21 at the rear part of the seedling stand 11, the seedling stand 13 can be changed in posture between a working posture A12, which is a second working posture extending rearward from the rear part of the seedling stand 11 so as to be continuous with the seedling stand 11, and a storage posture A22, which is a second storage posture folded upward from the rear part of the seedling stand 11.

[0096] As shown in FIGS. 17 and 18, a round bar-shaped support frame 47 as a support portion is provided along the left-right direction at the right front portion and the left front portion of step 6. When the standby seedling stage 13 is operated to the working posture A12, the horizontal frame 66 of the standby seedling stage 13 is placed on the support frame 47, and the rear portion of the standby seedling stage 13 is supported by the support frame 47. Thereby, the front portion of the standby seedling stage 13 is supported by the rear portion of the standby seedling stage 11, and the rear portion of the standby seedling stage 13 is supported by step 6 (support frame 47).

[0097] When the standby seedling stage 13 is operated to the working posture A12, the support frame 47 enters between the rear end portion of the frame 23 and the engaging portion 46, and the engaging portion 46 is in a state of engaging with the support frame 47. Thereby, the position of the standby seedling stage 13 in the front-rear direction is determined by the rear end portion of the frame 23 and the engaging portion 46.

[0098] As described above (the frame configuration of the first standby seedling stage) and as shown in FIG. 8, the mounting positions of the standby seedling stage 11 on the support frames 16 to 19 are adjustable in the front-rear direction. By adjusting the mounting position of the standby seedling stage 11 in the front-rear direction, the position of the standby seedling stage 13 in the working posture A12 can be adjusted in the front-rear direction.

[0099] Thereby, as shown in FIGS. 17 and 18, when the standby seedling stage 13 is operated to the working posture A12, the support frame 47 can be set to enter between the rear end portion of the frame 23 and the engaging portion 46 without coming off, and the engaging portion 46 can be set to engage with the support frame 47 without coming off.

[0100] As shown in FIGS. 1 and 3, the rear holding portion 26 is provided at a portion above the standby seedling stage 11 in the support frame 17 and at a portion below the standby seedling stage 24. By operating the standby seedling stage 13 to the storage posture A22 and holding the locking portion 40 of the standby seedling stage 13 by the rear holding portion 26, the standby seedling stage 13 can be held in the storage posture A22. By releasing the holding of the rear holding portion 26, the standby seedling stage 13 can be operated to the working posture A12.

[0101] (Configuration regarding the third right spare seedling stand and the fuel tank) As shown in FIGS. 2 and 18, the fuel tank 48 is disposed inside the right front portion of the step 6 and provided in the airframe 3, and the fuel filler port 48a of the fuel tank 48 projects upward through the opening 6a of the step 6. When the right spare seedling stand 13 is operated to the working posture A12, the fuel tank 48 (fuel filler port 48a) is positioned below the right spare seedling stand 13.

[0102] In the right spare seedling stand 13, a flat plate-shaped cover 49 as a protection part is connected to the horizontal frame 66 and extends forward below the support roller 33. When the right spare seedling stand 13 is operated to the working posture A12, the cover 49 covers the upper part of the fuel tank 48 (fuel filler port 48a) and the upper part of the opening 6a of the step 6.

[0103] (States of the postures of the first, second, and third spare seedling stands) As shown in FIGS. 1 and 3, the spare seedling stand 11 is set to a forward rising posture in which the front part of the spare seedling stand 11 is higher than the rear part with respect to the airframe 3. In a state where the spare seedling stands 12 and 13 are operated to the working postures A11 and A12, the spare seedling stands 12 and 13 are set to a forward rising posture in which the front parts of the spare seedling stands 12 and 13 are higher than the rear parts with respect to the airframe 3.

[0104] When the spare seedling stand 12 is operated to the storage posture A21, the storage posture A21 is set so that the angle B1 in a side view between the spare seedling stand 12 in the storage posture A21 and the spare seedling stand 11 is smaller than a right angle. When the spare seedling stand 13 is operated to the storage posture A22, the storage posture A22 is set so that the angle B2 in a side view between the spare seedling stand 13 in the storage posture A22 and the spare seedling stand 11 is smaller than a right angle.

[0105] The storage postures A21 and A22 are set such that the angle B2 is slightly smaller than the angle B1. As a result, the storage posture A21 is set to a posture that stands up from the spare seedling placing table 11 more than the storage posture A22, and the storage posture A22 is set to a posture closer to the spare seedling placing table 11 than the storage posture A21.

[0106] With the above configuration, at least one of the storage posture A21 and the storage posture A22 is set to a posture closer to the working postures A11 and A12 than the posture in which the spare seedling placing table 12 and the spare seedling placing table 13 are stacked on the spare seedling placing table 11.

[0107] (First alternative form of the invention) As shown in FIG. 19, when assuming a virtual line K2 extending in the front-rear direction along the spare seedling placing table 11 in a side view, the first fulcrum portion 41, the second fulcrum portion 42, the first contact portion 51, and the second contact portion 52 may be configured such that the working posture A11 of the spare seedling placing table 12 is set to an upward posture from the virtual line K2 in a state where the seedling E is not placed on the spare seedling placing table 12 when the spare seedling placing table 12 is operated to the working posture A11.

[0108] The front-rear length of the spare seedling placing table 13 may be set to be shorter than the front-rear length of the spare seedling placing table 12. According to this configuration, when the spare seedling placing table 13 is operated to the working posture A12, the rear portion of the spare seedling placing table 13 may not be supported by the support frame 47 (see FIGS. 17 and 18).

[0109] In this case, the spare seedling placing table 13 may be configured to be set (maintained) to the working posture A12 by the contact between the fulcrum portion 43 of the spare seedling placing table 11 and the fulcrum portion 45 of the spare seedling placing table 13. The configuration regarding the first horizontal frame 61 and the second horizontal frame 62 described in the above (configuration regarding the support of the second spare seedling placing table) may also be adopted for the horizontal frame 63 (see FIG. 5) of the spare seedling placing table 11 and the horizontal frame 65 (see FIG. 15) of the spare seedling placing table 13.

[0110] In the above configuration, as shown in Fig. 19, the support base 13 for preliminary seedlings may be configured with fulcrum portions 43 and 45 such that when the support base 13 for preliminary seedlings is operated to the working posture A12 and no seedling E is placed on the support base 13 for preliminary seedlings, the working posture A12 of the support base 13 for preliminary seedlings is set to an upward posture with respect to the virtual line K2.

[0111] (Second alternative form of the invention) The longitudinal length of the support base 12 for preliminary seedlings may be set to be shorter than the longitudinal length of the support base 13 for preliminary seedlings. In this configuration, as shown in Figs. 1 and 2, in the front-rear direction of the machine body 3, the front end portion of the support base 11 for preliminary seedlings may be configured to be disposed at substantially the same position as the front end portion of the bonnet 9 and the front end portion of the floor 5.

[0112] (Third alternative form of the invention) As shown in Fig. 3, in the angles B1 in side view between the support base 12 for preliminary seedlings in the storage posture A21 and the support base 11 for preliminary seedlings, and the angles B2 in side view between the support base 13 for preliminary seedlings in the storage posture A22 and the support base 11 for preliminary seedlings, the storage postures A21 and A22 may be configured such that the angles B1 and B2 are smaller than a right angle, and the angle B1 is slightly smaller than the angle B2.

[0113] When the support base 12 for preliminary seedlings is operated to the storage posture A21, it may be configured such that the support base 12 for preliminary seedlings assumes a vertical posture (a posture parallel to the support frame 16). In this configuration, the angle B1 is slightly larger than a right angle.

[0114] When the support base 13 for preliminary seedlings is operated to the storage posture A22, it may be configured such that the support base 13 for preliminary seedlings assumes a vertical posture (a posture parallel to the support frame 17). In this configuration, the angle B2 is slightly smaller than a right angle.

[0115] (Fourth alternative form of the invention) In FIG. 3, when the spare seedling stage 12 is operated to the storage position A21, the spare seedling stage 12 is stacked above the spare seedling stage 11 over the entire spare seedling stage 12. When the spare seedling stage 13 is operated to the storage position A22, it may be configured to be in the position shown in FIG. 3. In this configuration, the front holding portion 25 may be abolished, and the front-rear length of the spare seedling stage 12 may be set to be the same as the front-rear length of the spare seedling stage 11 or slightly shorter than the front-rear length of the spare seedling stage 11.

[0116] When the front holding portion 25 is left without being abolished, the spare seedling stage 12 may be configured to be in the storage position A21 held by the front holding portion 25 and in the posture where the spare seedling stage 12 is stacked above the spare seedling stage 11 over the entire spare seedling stage 12 and is operated to the storage position A21. In this configuration, two types of storage positions A21 with different postures are set for the spare seedling stage 12.

[0117] (Fifth alternative form of the invention) In FIG. 3, when the spare seedling stage 12 is operated to the storage position A21, the spare seedling stage 12 is in the position shown in FIG. 3. When the spare seedling stage 13 is operated to the storage position A22, it may be configured to be in the posture where the spare seedling stage 13 is stacked above the spare seedling stage 11 over the entire spare seedling stage 13.

[0118] In this configuration, the rear holding portion 26 may be abolished, and the front-rear length of the spare seedling stage 13 may be set to be the same as the front-rear length of the spare seedling stage 11 or slightly shorter than the front-rear length of the spare seedling stage 11. When the operator gets on and off from the ground to the floor 5 and from the floor 5 to the ground, the operator can hold both the frame 14 (see FIG. 1) and the support frame 17 as handrails.

[0119] When the rear holding part 26 is left without being abolished, the spare seedling placing table 13 may be configured such that it can be operated into a storage posture A22 held by the rear holding part 26 and a posture in which the spare seedling placing table 13 is stacked above the spare seedling placing table 11 over the entire spare seedling placing table 13. In this configuration, two types of storage postures A22 with different postures are set for the spare seedling placing table 13.

[0120] (Sixth alternative form of the invention's implementation) In FIG. 3, when the spare seedling placing table 13 is operated into the storage posture A22, if it is configured such that the spare seedling placing table 13 is stacked above the spare seedling placing table 11 over the entire spare seedling placing table 13, the spare seedling placing table 12 may be configured as follows.

[0121] As shown in FIGS. 20, 21, and 22, a first support part 53, which is a front and rear support part, is provided at the front part of the spare seedling placing table 11 so as to be movable in the front and rear direction, and a second support part 54, which is a front and rear support part, is supported at the front part of the first support part 53 so as to be swingable around an axis core P5 along the left and right direction. The spare seedling placing table 12 is supported at the front part of the second support part 54 so as to be swingable around a first support axis core P11.

[0122] The state shown in FIG. 20 is a state in which the spare seedling placing table 12 is operated into the working posture A11, and the first support part 53 and the second support part 54 are operated rearward (inward of the spare seedling placing table 11) until the rear part of the spare seedling placing table 12 contacts the front part of the spare seedling placing table 11.

[0123] As shown in FIG. 20, when the spare seedling placing table 13 is operated into the storage posture A22, as shown in FIG. 21, the spare seedling placing table 12, the first support part 53, and the second support part 54 are moved forward, and the position of the axis core P5 is moved to a position in front of the front part of the spare seedling placing table 11. Next, as shown in FIG. 22, the spare seedling placing table 11 and the second support part 54 are swing-operated upward around the axis core P5 to change the posture upward with respect to the spare seedling placing table 11.

[0124] By the above operation, the position of the first support axis P11 becomes substantially the same position as the upper surface of the spare seedling stand 13 in the storage posture A22, or a position slightly higher than the upper surface of the spare seedling stand 13 in the storage posture A22. Therefore, the spare seedling stand 12 is swing-operated backward around the first support axis P11 and is operated to the storage posture A21 in which it is stacked above the spare seedling stand 13 over the entire spare seedling stand 12.

[0125] (Seventh alternative form of the invention) In the above-mentioned (Sixth form of the invention), the first support portion 53 is provided at the rear portion of the spare seedling stand 11 so as to be movable in the front-rear direction, and the second support portion 54 is supported at the rear portion of the first support portion 53 so as to be swingable around the axis P5 along the left-right direction. The spare seedling stand 13 may be configured to be supported at the rear portion of the second support portion 54 so as to be swingable around the second support axis P21.

[0126] According to this configuration, the spare seedling stand 12 is operated to the storage posture A21 in which it is stacked above the spare seedling stand 11 over the entire spare seedling stand 12, and the spare seedling stand 13 is operated to the storage posture A22 in which it is stacked above the spare seedling stand 12 in the storage posture A21 over the entire spare seedling stand 13.

[0127] (Eighth alternative form of the invention) As shown in FIG. 23, in the spare seedling stand 13, the right and left brackets 55 are provided at the right and left engaging portions 46, and the rear guide roller 50, which is a rear guide member having a length extending across the right and left frames 23, is arranged around the axis P6, which is an axis along the left-right direction perpendicular to the longitudinal direction of the frame 23 and is a rear axis, so as to be rotatable across the right and left brackets 55.

[0128] Thereby, the rear guide roller 50 rotatable around the axis P6 along the left-right direction is provided at the rear end portion of the spare seedling stand 13 so as to be disposed at a position higher than the support roller 33 (seedling placement portion).

[0129] (Ninth alternative form of the invention) As the front case inner member and the rear case inner member, instead of the front guide roller 38 and the rear guide roller 50, a fixed cylindrical member that does not rotate (not shown), a flat plate-shaped front guide plate (not shown) set in an inclined posture facing obliquely rearward and downward, or a flat plate-shaped rear guide plate (not shown) set in an inclined posture facing obliquely forward and downward may be provided on the preliminary seedling placing bases 12 and 13.

[0130] (The 10th alternative form of the invention's implementation) As shown in Fig. 24, when placing the roll-shaped seedling E on the preliminary seedling placing bases 11, 12, and 13, the roll-shaped seedling E may be stacked and placed in the seedling box 56, and this seedling box 56 may be placed on the preliminary seedling placing bases 11, 12, and 13. In Fig. 24, the seedling boxes 56 are placed one by one on one preliminary seedling placing base 11, 12, or 13, but the seedling boxes 56 stacked with the roll-shaped seedlings E may be stacked vertically.

[0131] (The 11th alternative form of the invention's implementation) As the seedling placing part of the preliminary seedling placing base 11, a support roller 31 or a support member (not shown) mainly functioning to support the seedling E and a support roller 31 mainly functioning to convey the seedling E along the front-rear direction may be configured to be mixed on the preliminary seedling placing base 11. In this case, the support roller 31 mainly functioning to support the seedling E may be configured as a fixed one that does not rotate. The support member may be configured as a fixed rod-shaped member or an elongated flat plate-shaped member that does not rotate. The above-described configuration may be adopted for the preliminary seedling placing base 12 and the preliminary seedling placing base 13.

[0132] On the preliminary seedling placing base 11, the fixed support roller 31 that does not rotate and the rotatable support roller 31 may be configured to be alternately arranged along the front-rear direction. In this case, the fixed support roller 31 that does not rotate has the support function for the seedling E, but has a small or no conveying function along the front-rear direction of the seedling E. The rotatable support roller 31 has both the support function and the conveying function along the front-rear direction for the seedling E. The above configuration may be adopted for the spare seedling platforms 12 and 13.

[0133] (The 12th alternative form of the invention's implementation) An entry / exit detection unit (not shown) using an ultrasonic method or an infrared method may be provided to detect the entry / exit operation of an operator from the ground to the floor 5 and from the floor 5 to the ground by the entry / exit detection unit, and an electric motor (not shown), which is a storage mechanism for swing-driving the spare seedling platform 13 around the second support axis P21, may be provided.

[0134] Thereby, when the entry / exit operation of an operator from the ground to the floor 5 and from the floor 5 to the ground is detected by the entry / exit detection unit in a state where the spare seedling platform 13 is operated to the working posture A12, the spare seedling platform 13 may be configured to be automatically operated to the storage posture A22 or the posture stacked on the spare seedling platform 11 (storage posture A22) by the electric motor.

[0135] (The 13th alternative form of the invention's implementation) In the spare seedling platforms 11, 12, and 13, the support rollers 31, 32, and 33 may be abolished, and flat members may be attached across the right and left frames 21, 22, and 23 as the seedling placement portions.

[0136] In the spare seedling platform 12, the support roller 32 may be used as the seedling placement portion, and in the spare seedling platforms 11 and 13, the support rollers 31 and 33 may be abolished, and flat members may be attached across the right and left frames 21 and 23 as the seedling placement portions.

[0137] In the spare seedling platform 13, the support roller 33 may be used as the seedling placement portion, and in the spare seedling platforms 11 and 12, the support rollers 31 and 32 may be abolished, and flat members may be attached across the right and left frames 21 and 22 as the seedling placement portions.

[0138] In the standby seedling stands 12 and 13, the support rollers 32 and 33 may be used as the seedling placement portions, and in the standby seedling stand 11, the support roller 31 may be abolished, and a flat member may be attached across the right and left frames 21 as the seedling placement portion.

[0139] (The 14th alternative form of the invention's implementation) In the standby seedling stands 11, 12, and 13, the standby seedling stands 11 and 12 may be provided, and the standby seedling stand 13 may be abolished. In this configuration, the rear guide roller 50 may be provided at the rear end portion of the standby seedling stand 11.

[0140] In the standby seedling stands 11, 12, and 13, the standby seedling stands 11 and 13 may be provided, and the standby seedling stand 12 may be abolished. In this configuration, the front guide roller 38 may be provided at the front end portion of the standby seedling stand 11.

[0141] In the standby seedling stands 11, 12, and 13, the standby seedling stands 12 and 13 may be connected to the standby seedling stand 11 in the working postures A11 and A12, and the standby seedling stands 12 and 13 may be configured to be non-foldable in the storage postures A21 and A22. In this configuration, the plurality of standby seedling stands 11, 12, and 13 may be configured to be supported by the support frames 16 and 17 while being arranged along the vertical direction with a vertical interval provided between them.

[0142] (The 15th alternative form of the invention's implementation) The standby seedling stands 11, 12, and 13 may be separated from each other and may be independent standby seedling stands 11, 12, and 13. In this configuration, the standby seedling stands 11, 12, and 13 may be configured to be supported by the support frames 16 and 17 while being arranged along the vertical direction with a vertical interval provided between them. The front guide roller 38 may be provided at each front end portion of the standby seedling stands 11, 12, and 13, and the rear guide roller 50 may be provided at each rear end portion of the standby seedling stands 11, 12, and 13.

Industrial applicability

[0143] The present invention can be applied to a riding rice transplanter.

Explanation of symbols

[0144] 3 aircraft 11 spare seedling stands 12 spare seedling stands 13 spare seedling stands 16 support frames 17 support frames 18 support frames 19 support frames 20 support frames 32 support rollers (seedling placement part) 33 support rollers (seedling placement part) 38 front guide rollers (front guide member) 50 rear guide rollers (rear guide member) E seedlings K1 virtual line L21 length (interval) L22 length (interval) L23 length (interval) L24 length (interval) L25 length (interval) P2 axis P4 axis (front axis) P6 axis (rear axis)

Claims

1. a support frame provided at the front part of the machine body; a pre-seedling stage having a seedling placement part supported by the support frame and on which seedlings are placed; a front guiding member capable of guiding seedlings to the seedling placement part from the front is provided at the front end part of the pre-seedling stage so as to be arranged at a position higher than the seedling placement part; the seedling placement part is rotatably supported around an axis along the left-right direction and is a plurality of support rollers arranged side by side in the front-rear direction; among the plurality of support rollers, in a first support roller closest to the front guiding member and a second support roller adjacent to the rear side of the first support roller; a riding rice transplanter in which a front-rear direction interval between the first support roller and the second support roller is set to be smaller than a front-rear direction interval between the front guiding member and the first support roller.

2. The riding rice transplanter according to claim 1, wherein the front guiding member is a front guiding roller rotatable around a front axis along the left-right direction.

3. The riding rice transplanter according to claim 1 or 2, wherein a virtual line connecting an upper end part of the front guiding member and an upper end part of the first support roller overlaps with the second support roller in a side view.

4. The riding rice transplanter according to claim 3, wherein the virtual line is located above the axis of the second support roller in a side view.

5. The riding rice transplanter according to any one of claims 1 to 4, wherein a front-rear direction interval between support rollers other than the first support roller and the second support roller among the plurality of support rollers is set to be larger than a front-rear direction interval between the first support roller and the second support roller.

6. The riding rice transplanter according to any one of claims 1 to 5, wherein a rear guiding member is provided at the rear end part of the pre-seedling stage so as to be arranged at a position higher than the seedling placement part.

Images