Riding rice transplanter

Abstract

To improve operability of second and third reserve seedling trays to storage attitudes in a sulky rice transplanter including first, second and third reserve seedling trays.SOLUTION: A sulky rice transplanter includes: a first reserve seedling tray 11 supported by support frames 16 and 17; a second reserve seedling tray 12 capable of changing an attitude between a work attitude A11 and a storage attitude A21 around a first support shaft core P11 along the horizontal direction of a front part of the first reserve seedling tray 11; and a third reserve seedling tray 13 capable of changing an attitude between a work attitude A12 and a storage attitude A 22 around a second support shaft core P21 along the horizontal direction of a rear part of the first reserve seedling tray 11. At least one of the storage attitude A21 and the storage attitude A22 is set to an attitude closer to the work attitude A11 and the work attitude A12 than an attitude where the second and third reserve seedling trays are stacked on the first reserve seedling tray 11.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a riding rice transplanter having a spare seedling carrier provided at the front of the body. [Background technology]

[0002] In the riding rice transplanter disclosed in Patent Document 1, a first spare seedling tray is supported on a support frame provided at the front of the machine body, a second spare seedling tray is foldably supported at the front of the first spare seedling tray, and a third spare seedling tray is foldably supported at the rear of the first spare seedling tray.

[0003] When the spare seedling stands are not in use, such as when moving, the third spare seedling stand is folded and stacked on the first spare seedling stand to operate the third spare seedling stand in a stored position. The second spare seedling stand is folded and stacked on the third spare seedling stand to operate the second spare seedling stand in a stored position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-31 A Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the operation of moving the second and third spare seedling trays to a stored position requires rotating both the second and third spare seedling trays 180 degrees, so there is room for improvement in terms of operability. The present invention has an object to improve the operability of a riding rice transplanter provided with first, second and third spare seedling trays to a storage position for the second and third spare seedling trays. [Means for solving the problem]

[0006] The riding rice transplanter of the present invention is provided with a Previous A support frame; a rear support frame disposed on a front portion of the fuselage and spaced rearward from the front support frame; The above The front support frame and the rear support frame The system includes a first spare seedling stand supported by a support frame, a second spare seedling stand supported on the front part of the first spare seedling stand so as to be changeable between a first working position in which the first spare seedling stand is extended forward from the front part of the first spare seedling stand so as to be connected to the first spare seedling stand, and a first storage position in which the first spare seedling stand is folded upward from the front part of the first spare seedling stand, around a first support shaft core along the left-right direction of the front part of the first spare seedling stand, and a third spare seedling stand supported on the rear part of the first spare seedling stand so as to be changeable between a second working position in which the first spare seedling stand is extended backward from the rear part of the first spare seedling stand so as to be connected to the first spare seedling stand, and a second storage position in which the first spare seedling stand is folded upward from the rear part of the first spare seedling stand, A front holding section capable of holding and releasing the second spare seedling tray operated to the first storage position is provided at a portion of the front support frame that protrudes upward from the first spare seedling tray, and a rear holding section capable of holding and releasing the third spare seedling tray operated to the second storage position is provided at a portion of the rear support frame that protrudes upward from the first spare seedling tray, The first storage position and the second storage position The momentum, The second spare seedling tray and the third spare seedling tray are set to a posture closer to the first working posture and the second working posture than the posture in which they are stacked on the first spare seedling tray.

[0007] According to the present invention, when the first, second and third spare seedling trays are folded, the third spare seedling tray is folded. Even if the first spare seedling tray is operated to a storage position where it is stacked on the second spare seedling tray, 3. The storage position is close to the working position, and does not require any operation when the seedlings are stacked on the storage rack. Just operate it as follows. Or, the second spare seedling tray is operated to a storage position stacked on the first spare seedling tray. However, the third spare seedling tray can be stacked on the second spare seedling tray without any operation. It is sufficient to operate it to a storage position that is close to the working position. Alternatively, the second and third spare seedling trays may be operated to a position where they are stacked on the first spare seedling tray. It is not necessary to prepare the second spare seedling tray, and it is enough to operate the second spare seedling tray to a storage position close to the working position. The third spare seedling tray can be operated to a storage position that is close to the working position.

[0008] In this case, the storage position in which the second and third spare seedling trays are folded upward includes a position in which the angle between the first and second (third) spare seedling trays is a predetermined angle (for example, an angle of approximately 90 degrees), the entire second (third) spare seedling tray is not stacked on the first spare seedling tray, and the second (third) spare seedling tray faces upward from the first spare seedling tray, and includes a position in which the entire second (third) spare seedling tray is stacked above the first spare seedling tray.

[0009] According to the present invention, in a riding rice transplanter equipped with first, second and third spare seedling trays, there is no need to rotate both the second and third spare seedling trays 180 degrees and stack them on the first spare seedling tray, thereby improving the operability of the second and third spare seedling trays in their storage positions. According to the present invention, when the second spare seedling tray is operated to the first storage position, the front holding portion can hold the second spare seedling tray in the first storage position, thereby increasing the reliability of holding the second spare seedling tray in the first storage position. When the third spare seedling tray is operated to the second storage position, the rear holding section can hold the third spare seedling tray in the second storage position, thereby increasing the reliability of holding the third spare seedling tray in the second storage position. According to the present invention, the front holding portion and the rear holding portion are provided at the portions of the front and rear support frames that extend upward from the first spare seedling tray, and the front and rear support frames, which are existing members, are also used as support members for the front support portion and the rear holding portion, which is advantageous in terms of simplifying the structure.

[0010] In the present invention, it is preferable that the first storage position is set to a position that is more upright from the first spare seedling platform than the second storage position, and that the second storage position is set to a position that is closer to the first spare seedling platform than the first storage position.

[0011] In riding rice transplanters, the driver's seat is often located at the rear of the machine, and the operator often gets on and off from the side of the rear of the machine. In this case, when the third spare seedling stand is operated to the working position, the third spare seedling stand may hinder the operator's getting on and off. In contrast, the second spare seedling stand does not have much of an effect on the operator's getting on and off.

[0012] According to the present invention, by focusing on the fact that the second spare seedling platform does not have much of an effect on the worker getting on and off the vehicle, the storage position of the second spare seedling platform is set to a position that is more upright from the first spare seedling platform than the storage position of the third spare seedling platform, so there is no need to significantly move the second spare seedling platform toward the first spare seedling platform (storage position).

[0013] According to the present invention, the storage position of the third spare seedling platform is set to a position closer to the first spare seedling platform than the storage position of the second spare seedling platform, and the third spare seedling platform is largely operated toward the first spare seedling platform (storage position). This reduces the likelihood that the third spare seedling carrier will be an obstacle to the operator getting on and off the vehicle, improving the ease with which the operator can get on and off the vehicle.

[0014] In the present invention, it is preferable that the first storage position is set so that the angle between the second spare seedling tray and the first spare seedling tray in the first storage position is smaller than a right angle in a side view, and that the second storage position is set so that the angle between the third spare seedling tray and the first spare seedling tray in the second storage position is smaller than a right angle in a side view.

[0015] According to the present invention, when the second spare seedling tray is operated to a storage position, the second spare seedling tray attempts to move toward the first spare seedling tray, thereby reducing the chance of the second spare seedling tray operated to a storage position erroneously moving to a working position. According to the present invention, when the third spare seedling stand is operated to a storage position, the third spare seedling stand attempts to move toward the first spare seedling stand, thereby reducing the chance of the third spare seedling stand operated to the storage position erroneously moving to the working position.

[0016] In the present invention, one of the second spare seedling stand and the third spare seedling stand is supported around one of the first support shaft core and the second support shaft core so as to be able to change its position, and a front-rear support part is provided on the first spare seedling stand so as to be able to move from one of the front and rear parts of the first spare seedling stand to one of the front and rear parts, and in a state where the first spare seedling stand is moved from one of the front and rear parts to one of the front and rear parts, the front-rear support part is able to change its position upward with respect to the first spare seedling stand, and the other of the second spare seedling stand and the third spare seedling stand is supported around one of the first support shaft core and the second support shaft core so as to be able to change its position, It is preferable that the entirety of the other of the spare seedling tray and the third spare seedling tray can be changed to a stacked position above the first spare seedling tray, and that by moving the front and rear support parts forward or backward and changing their position upward, one of the second spare seedling tray and the third spare seedling tray can be stacked above the other of the second spare seedling tray and the third spare seedling tray, which has been operated to a stacked position on the first spare seedling tray, over the entirety of one of the second spare seedling tray and the third spare seedling tray.

[0017] According to the present invention, when one of the second and third spare seedling trays is operated to a position stacked on the first spare seedling tray, the other of the second and third spare seedling trays can be operated to a position stacked on one of the second and third spare seedling trays. This state is suitable for transporting the riding rice transplanter on the bed of a truck or for storing the riding rice transplanter in a warehouse, etc. This is advantageous in terms of improving the ease of getting on and off the machine, as the third spare seedling platform is less likely to interfere with the operator's getting on and off the machine.

[0018] According to the present invention, when one of the second and third spare seedling trays is operated to a position where it is stacked on top of the other of the second and third spare seedling trays stacked on the first spare seedling tray, the front and rear support parts are moved forward (rear) from the first spare seedling tray together with one of the second and third spare seedling trays, and the front and rear support parts are operated upward together with one of the second and third spare seedling trays.

[0019] This allows the position of the first support axis (second support axis) of the front and rear support parts to be positioned at approximately the same height (or slightly higher) as the other of the second and third spare seedling trays stacked on the first spare seedling tray. By manipulating one of the second and third spare seedling trays backward around the first support axis (second support axis), one of the second and third spare seedling trays can be smoothly manipulated into a position where it is stacked on top of the other of the second and third spare seedling trays which are stacked on the first spare seedling tray.

[0020]

[0021]

[0022]

[0023] In the present invention, it is preferable that the front-to-back length of one of the second spare seedling tray and the third spare seedling tray is set to be shorter than the front-to-back length of the other of the second spare seedling tray and the third spare seedling tray.

[0024] In a riding rice transplanter, when the second spare seedling stand is operated to the working position, the second spare seedling stand may protrude forward from the front end of the machine body. If the second spare seedling stand protrudes forward from the front end of the machine body, the second spare seedling stand may hinder the machine from turning when the machine is turned near an obstacle such as a ridge.

[0025] According to the present invention, when the front-to-back length of the second spare seedling tray is set shorter than the front-to-back length of the third spare seedling tray, the front-to-back length of the second spare seedling tray is relatively short, so that even when the second spare seedling tray is operated into the working position, the second spare seedling tray does not extend too far forward from the front end of the body. As a result, when the machine is turned near an obstacle such as a ridge, the second spare seedling tray is less likely to interfere with the turning, which is advantageous in terms of improving the maneuverability of the machine. According to the present invention, when the front-to-rear length of the third spare seedling tray is set to be shorter than the front-to-rear length of the second spare seedling tray, the third spare seedling tray is less likely to hinder workers getting on and off the machine, which is advantageous in terms of improving the ease with which workers can get on and off the machine.

[0026] In the present invention, it is preferable that a fuel tank is provided on the machine body so as to be positioned below the third spare seedling tray when it is operated to the second working position, and that a protective section is provided on the third spare seedling tray which covers the top of the fuel tank when the third spare seedling tray is operated to the second working position.

[0027] In a riding rice transplanter, if the fuel tank is installed at the rear of the machine, the fuel tank may be located below the third spare seedling stand that is operated to the working position. In this state, if seedlings are placed on the third spare seedling stand, soil and water from the seedlings may fall onto the fuel tank and adhere to it.

[0028] According to the present invention, a protective section is provided on the third spare seedling tray, and when the third spare seedling tray is operated into a working position, the protective section covers the upper part of the fuel tank, so that even if soil, water, etc. fall from the seedlings placed on the third spare seedling tray, the soil, water, etc. are less likely to adhere to the fuel tank.

[0029] In the present invention, it is preferable that the machine is provided with a floor on the body and a step provided at the rear of the body and positioned higher than the floor, and that a support portion supporting the rear of the third spare seedling tray operated to the second working position is provided on the step, and that an engagement portion is provided on the third spare seedling tray which engages with the support portion when the third spare seedling tray is operated to the second working position and determines the fore-and-aft position of the third spare seedling tray.

[0030] In some riding rice transplanters, a step that is higher than the floor is provided at the rear of the machine. An operator often stands on the step to supply seedlings to a seedling planting device supported at the rear of the machine.

[0031] According to the present invention, when the third spare seedling tray is operated to the working posture, the rear part of the third spare seedling tray is supported by the support part of the step. As a result, the front of the third spare seedling platform is supported by the first spare seedling platform and the rear of the third spare seedling platform is supported by the support part of the step, so that even if a large number of seedlings are placed on the third spare seedling platform, the third spare seedling platform is stably supported in the working position.

[0032] According to the present invention, when the third spare seedling tray is operated into the working position, the rear of the third spare seedling tray is supported by the support portion of the step, and the engagement portion of the third spare seedling tray engages with the support portion of the step. This allows the position of the third spare seedling tray in the front-rear direction to be determined, so that the third spare seedling tray is stably supported in the working position.

[0033] In the present invention, it is preferable that a position adjustment part is provided that can adjust the mounting position of the first spare seedling tray on the support frame in the front-rear direction.

[0034] According to the present invention, by adjusting the mounting position of the first spare seedling tray on the support frame in the fore-and-aft direction, the position of the third spare seedling tray in the working position can be adjusted in the fore-and-aft direction, so that when the third spare seedling tray is operated into the working position, the engagement portion of the third spare seedling tray can be set to engage with the support portion of the step without coming off.

[0035] In the present invention, it is preferable to provide a boarding / disembarking detection unit that detects the operator's boarding / disembarking actions on the floor, and a storage mechanism that automatically operates the third spare seedling tray to the second storage position or a position stacked on the first spare seedling tray based on detection by the boarding / disembarking detection unit.

[0036] In riding rice transplanters, the driver's seat is often located at the rear of the machine, and the operator often gets on and off from the side of the rear of the machine. In this case, if the third spare seedling stand is operated to the working position, the third spare seedling stand may hinder the operator from getting on and off.

[0037] According to the present invention, when an operator attempts to get on or off the vehicle, the operator's getting on or off is detected and the third spare seedling tray is automatically operated to a stored position or to a position stacked on the first spare seedling tray, thereby reducing the third spare seedling tray's hindrance to the operator's getting on or off the vehicle and improving the operator's ability to get on or off the vehicle. [Brief description of the drawings]

[0038] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] This is a left side view of the support frame and the first, second, and third spare seedling trays. [Figure 4] FIG. 13 is a left side view of the first, second, and third spare seedling trays. [Diagram 5] FIG. 11 is a plan view of the first spare seedling tray. [Figure 6] FIG. 13 is a left side view of the first spare seedling tray. [Figure 7] FIG. 2 is an oblique view of the frame of the spare seedling tray. [Figure 8] This is a left side view of the support frame and the frame of the first spare seedling tray. [Figure 9] FIG. 2 is an exploded oblique view of the support rollers, one bearing portion, and frame of the spare seedling tray. [Figure 10] This is a vertical cross-sectional front view of the support rollers of the spare seedling tray, one of the bearing portions, and the frame. [Figure 11] This is a cross-sectional plan view of the support rollers, one bearing portion, and frame of the spare seedling tray. [Figure 12] A longitudinal front view of the support rollers of the spare seedling tray, the other bearing portion, and the frame. [Figure 13] FIG. 11 is a plan view of a second spare seedling tray. [Figure 14] FIG. 11 is a longitudinal side view of a second spare seedling tray. [Figure 15] FIG. 11 is a plan view of the third spare seedling tray. [Figure 16] A left side view of the third spare seedling tray. [Figure 17] This is an oblique view of the rear part of the left third spare seedling tray (working position) and the left front part of the step. [Figure 18] This is a vertical cross-sectional side view of the rear part of the right third spare seedling tray (working position) and the right front part of the step. [Figure 19] FIG. 11 is a left side view of the first, second and third spare seedling trays in the first alternative embodiment of the invention. [Figure 20] FIG. 13 is a left side view of the first, second and third spare seedling trays in a sixth alternative embodiment of the invention. [Figure 21] FIG. 13 is a left side view of the first, second and third spare seedling trays in a sixth alternative embodiment of the invention. [Figure 22] FIG. 13 is a left side view of the first, second and third spare seedling trays in a sixth alternative embodiment of the invention. [Diagram 23] FIG. 13 is a left side view of the third spare seedling tray in the seventh alternative embodiment of the invention. [Figure 24] FIG. 23 is a left side view of the first, second and third spare seedling trays in a tenth alternative embodiment of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] Figures 1 to 24 show a riding rice transplanter equipped with a spare seedling tray, and in Figures 1 to 24, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0040] (Overall configuration of riding rice transplanter) As shown in Figures 1 and 2, a machine body 3 is supported by right and left front wheels 1 and right and left rear wheels 2, and a seedling planting device 4 for planting seedlings in the rice field surface is supported at the rear of the machine body 3 so that it can be raised and lowered.

[0041] A floor 5 is provided on the machine body 3, a step 6 is provided at the rear of the machine body 3 so as to be located at a higher position than the floor 5, and a driver's seat 7 is provided in front of the step 6. A fertilizer applicator 8 that supplies fertilizer to the rice field surface is provided at the rear of the step 6 so as to be located at a higher position than the step 6.

[0042] A bonnet 9 that houses an engine (not shown) is provided in front of the driver's seat 7 and in the center of the left and right front part of the floor 5, and a steering wheel 10 for steering the front wheels 1 is provided at the rear of the bonnet 9. Right and left frames 14 for handrails are connected to the body 3 and extend upward past the outer right and left sides of the step 6. A frame 15 is connected to the right and left frames 14 in the left-right direction.

[0043] (Configuration of the support frame that supports the spare seedling tray) 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 fuselage 3 and extend upwardly outwardly from the right front part and the left front part of the floor 5. A support frame 20 is connected across the upper parts of the right and left support frames 17 in the left-right direction.

[0044] The right and left support frames 16 are connected to the right and left parts of the front lower part of the fuselage 3 and extend upwardly on the laterally outer side of the right front part and the left front part of the floor 5, and the upper part of the support frame 16 is connected to the upper part of the support frame 17. The right and left support frames 18, 19 are connected to the right and left parts of the front lower part of the fuselage 3 and extend upwardly on the laterally outer side of the right front part and the left front part of the floor 5.

[0045] Right and left lights 27 that illuminate the front are attached to the support frame 16. Right and left spare seedling trays 24, on which one mat-shaped seedling can be placed, are attached to the upper parts of the support frames 16, 17. As described above, the support frames 16 to 20 are provided at the front of the body 3.

[0046] As shown in Figures 1 to 4, there are provided spare seedling trays 11 which are first spare seedling trays on the right and left, spare seedling trays 12 which are second spare seedling trays on the right and left, and spare seedling trays 13 which are third spare seedling trays on the right and left.

[0047] As described later in (Overall Configuration of the First Spare Seedlings Stand), the spare seedlings stand 11 is supported by support frames 16-20. As described below (Configuration for supporting the second spare seedling tray) (Configuration for supporting the third spare seedling tray), the spare seedling tray 12 is supported by the support frames 16-20 via the spare seedling tray 11, and the spare seedling tray 13 is supported by the support frames 16-20 via the spare seedling tray 11.

[0048] (Overall configuration of the first spare seedling tray) As shown in Figures 5 and 6, the spare seedling tray 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 seedling placing sections, right and left first fulcrum portions 41, right and left fulcrum portions 43, right and left first contact portions 51, a first horizontal frame 61 and a horizontal frame 63.

[0049] The right and left first fulcrum portions 41 are connected to the front end portion, which is the end portion in the front-rear direction of the frame 21, and the right and left first abutment portions 51 are connected to the first fulcrum portions 41, and the first abutment portions 51 are connected to the front end portion of the frame 21 via the first fulcrum portions 41. A first horizontal frame 61 is connected across the right and left first fulcrum portions 41, and the first horizontal frame 61 is connected to the front end portions of the right and left frames 21 via the first fulcrum portions 41 along the left-right direction.

[0050] The right and left fulcrum parts 43 are connected to the rear end part, which is the end part in the front-to-rear direction of the frame 21, and the horizontal frame 63 is connected across the right and left fulcrum parts 43, and the horizontal frame 63 is connected to the rear end part of the right and left frames 21 in the left-right direction via the fulcrum parts 43. The overall rigidity of the spare seedling tray 11 is ensured by the right and left frames 21, the first horizontal frame 61, and the horizontal frame 63.

[0051] A plurality of support rollers 31 are supported across the right and left frames 21 so as to be rotatable about an axis P1 along the left-right direction that is perpendicular to the longitudinal direction of the frames 21.

[0052] The support rollers 31 are arranged side by side along the front-to-rear direction, and are supported by the right frame 21 and the left frame 21 at intervals from each other in the front-to-rear direction so that a gap C1 is formed between adjacent support rollers 31. The length (spacing) L1 in the front-to-rear direction of the gap C1, which is the distance between adjacent support rollers 31, is set to be larger than the outer diameter D1 of the support roller 31.

[0053] In the right and left spare seedling trays 11 configured as described above, in the right spare seedling tray 11, the right frame 21 is supported on the upper part of the support frames 18, 19, and the left frame 21 is supported on the support frames 16, 17. In the left spare seedling tray 11, the right frame 21 is supported on the support frames 16, 17, and the left frame 21 is supported on the upper part of the support frames 18, 19. In this way, the spare seedling tray 11 is supported by the support frames 16-20.

[0054] As shown in Fig. 4, the mat-like seedlings E rolled up into a roll and secured with strings, bands, or the like can be dropped into the gaps C1, C2, C3 between the adjacent support rollers 31, 32, 33. The roll-like seedlings E can be stacked between the roll-like seedlings E placed on the support rollers 31, 32, 33. As a result, the roll-like seedlings E are positioned by the right and left frames 21, 22, 23 and the adjacent support rollers 31, 32, 33 in the front and rear, and are stably placed on the spare seedling stands 11, 12, 13 without rolling.

[0055] (Frame configuration for the first spare seedling tray) As shown in FIGS. 7 to 10, the frame 21 is made of aluminum material, and is provided with a flat plate portion 28 and a hollow portion 29.

[0056] The flat plate portion 28 is flat and extends in the front-rear direction, which is the longitudinal direction of the frame 21 (seedling placement portion) in side view. The flat plate portion 28 has an opening 28a for attaching the support roller 31 and a long hole 28b that is a position adjustment portion and extends in the front-rear direction.

[0057] As described above in (Overall configuration of the first spare seedling tray), when the frame 21 is attached to the support frames 16-19, the bolts 30 (see Figs. 3 and 8) are passed through the long holes 28b of the flat plate portion 28, and the flat plate portion 28 is attached to the support frames 16-19. This makes it possible to adjust the attachment position of the spare seedling tray 11 on the support frames 16-19 in the front-rear direction by the long holes 28b of the flat plate portion 28.

[0058] The hollow portion 29 is hollow and has a width greater than that of the flat portion 28 when viewed in cross section, is connected to the upper and lower portions of the flat portion 28, and extends along the front-to-rear direction, which is the longitudinal direction of the frame 21 (seedling placement portion) when viewed from the side.

[0059] A portion 29a of the hollow portion 29 facing the center of the support roller 31 (seedling placing portion) is formed in a straight line along the vertical direction in cross section. A portion 29b of the hollow portion 29 opposite the center of the support roller 31 (seedling placing portion) is formed in an arc shape that juts out toward the opposite side of the center of the support roller 31 (seedling placing portion) in cross section, and the hollow portion 29 is formed in the shape of a quarter circle in cross section.

[0060] Due to the above configuration, the frame 21 has a vertically symmetrical shape, and the right and left frames 21 are identical. The right and left frames 21 are arranged so that the portions 29a of the hollow portions 29 of the right and left frames 21 face each other (so that they face the centers of the support rollers 31).

[0061] (Configuration of support rollers in the first spare seedling tray) 9 to 12, the support roller 31 is made of aluminum and formed into a cylindrical shape, with one and the other ends being 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.

[0062] The support shaft 34 is made of a round pipe. A flat plate-shaped 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.

[0063] The bearing holder 36 is made of synthetic resin and is divided into two semi-ring shapes. It has a semi-cylindrical holder portion 36a, a plurality of protrusions 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.

[0064] In the bearing holder 36, the end of the convex portion 36b is located a predetermined length away from the flange portion 36c, which is the end of the bearing holder 36 opposite the insertion side into the support roller 31, toward the opposite side of the flange portion 36c, which is the insertion side into the support roller 31.

[0065] 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, a portion 36d where the convex portion 36b is not provided exists between the convex portion 36b and the flange portion 36c.

[0066] With the above configuration, holder portion 36a of the two-piece 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, 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.

[0067] Before the flange portion 36c of the bearing holder 36 reaches the end of the support roller 31 (shorterly before the bearing holder 36 is completely pressed into the end of the support roller 31), the portion 36d of the bearing holder 36 where the convex portion 36b is not provided reaches the end of the support roller 31, so that shavings are less likely to be generated.

[0068] When the flange portion 36c of the bearing holder 36 reaches the end of the support roller 31, the bearing holder 36 is completely press-fitted into the end of the support roller 31. As a result, the support roller 31 is rotatably supported on the support shaft 34 via the bearing 35 and the bearing holder 36.

[0069] (Configuration of support of support rollers in the first spare seedling stand) In the support roller 31 and support shaft 34 configured as described above (Configuration of the support rollers in the first spare seedling support bed), a bearing portion 37 is provided to support one part and the other part of the support shaft 34, as shown in Figures 9 to 12.

[0070] The bearing portion 37 is integrally formed from synthetic resin, and includes a main body portion 37a, a mounting portion 37b, an engagement portion 37c, a shaft insertion portion 37d, a groove portion 37e serving as a rotation prevention portion, a positioning portion 37f, and the like.

[0071] In the bearing portion 37, the main body portion 37a is formed in a square shape (rectangular shape) in a side view. The mounting portion 37b is formed in an octagonal shape (polygonal shape) in a side view and is attached to the main body portion 37a. A pair of claw-shaped engagement 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 innermost part of the shaft insertion portion 37d.

[0072] 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. 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 until the main body portion 37a of the bearing portion 37 comes into contact with 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, preventing the mounting portion 37b of the bearing portion 37 from falling off from the opening 28a of the flat plate portion 28.

[0073] At the same time, the main body 37a of the bearing part 37 fits between the upper and lower hollow parts 29, and the upper side of the main body 37a of the bearing part 37 comes into contact with the lower side of the upper hollow part 29, and the lower side of the main body 37a of the bearing part 37 comes into contact with the upper side of the lower hollow part 29, thereby preventing the bearing part 37 from rotating around the axis P1. As a result, the bearing part 37 is attached to the flat plate part 28 of the frame 21.

[0074] The flat portion 34a of the support shaft 34 is inserted into the shaft insertion portion 37d of the bearing portion 37 attached to one of the right and left frames 21, and then into the groove portion 37e of the bearing portion 37, so as to abut against the innermost portion of the groove portion 37e of the bearing portion 37. The end portion 34b of the support shaft 34 is inserted into the shaft insertion portion 37d of the bearing portion 37 attached to the other of the right and left frames 21, and abuts against the positioning portion 37f of the bearing portion 37.

[0075] As a result, one and the other portions of the support shaft 34 are supported by the bearing portions 37, and the support roller 31 is attached across the flat plate portions 28 of the right and left frames 21 so as to be rotatable around an axis P1 perpendicular to the longitudinal direction of the frames 21. The upper end portion of the support roller 31 is located lower than the upper end portion of the right frame 21 and the upper end portion of the left frame 21.

[0076] The groove 37e of the bearing portion 37 prevents rotation around the axis P1 of the support shaft 34. The groove 37e of one bearing portion 37 and the positioning portion 37f of the other bearing portion 37 determine the position of the support shaft 34 in the direction of the axis P1.

[0077] (Overall configuration of the second spare seedling tray) As shown in Figures 13 and 14, the spare seedling tray 12 has 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 placing portions, right and left second fulcrum portions 42, right and left second contact portions 52, a front guide roller 38 which is a front guide member, a locking portion 39, a second horizontal frame 62 and a horizontal frame 64.

[0078] The right and left second fulcrum portions 42 are connected to the rear end portion, which is the end portion in the front-to-rear direction of the frame 22, and the right and left second abutment portions 52 are connected to the second fulcrum portions 42, and the second abutment portions 52 are connected to the rear end portion of the frame 22 via the second fulcrum portions 42. A second horizontal frame 62 is connected across the right and left second fulcrum portions 42, and the second horizontal frame 62 is connected to the rear end portions of the right and left frames 22 via the second fulcrum portions 42 in the left-right direction.

[0079] The right and left support parts 44 are connected to the front end parts, which are the ends of the frame 22 in the fore-and-aft direction, and the horizontal frame 64 is connected across the right and left support parts 44, and the horizontal frame 64 is connected to the front ends of the right and left frames 22 in the left-right direction via the support parts 44. A locking part 39 formed into a channel shape in a plan view is connected to the front part of one of the frames 22. The overall rigidity of the spare seedling tray 12 is ensured by the right and left frames 22, the second horizontal frame 62, and the horizontal frame 64.

[0080] In the spare seedling stand 12, the frame 22 has a flat plate portion 28 and upper and lower hollow portions 29, similar to the frame 21 of the spare seedling stand 11 (see the above (Frame configuration in the first spare seedling stand) and Figures 7 to 12). In this case, the frame 22 does not have the long hole 28b of the flat plate portion 28.

[0081] The spare seedling stand 12 is provided with the same support rollers 32 as the support rollers 31 of the spare seedling stand 11, and is provided with the support shafts 34, bearings 35, bearing holders 36, and bearing parts 37 described above in (Configuration of the support rollers in the first spare seedling stand) (Support configuration of the support rollers in the first spare seedling stand). As with the spare seedling stand 11, the support rollers 32 are attached across the flat plate parts 28 of the right and left frames 22 so as to be rotatable about the axis P2 along the left-right direction, which is a direction perpendicular to the longitudinal direction of the frames 22.

[0082] (Configuration of the front guide roller in the second spare seedling tray) As shown in Figures 13 and 14, a front guide roller 38 having a length spanning the right and left frames 22 is supported across the upper parts of the right and left support portions 44 so as to be rotatable around axis P4, which is the front axis and is an axis along the left-right direction, which is a direction perpendicular to the longitudinal direction of the frame 22.

[0083] The front guide roller 38 is provided at the front end of the spare seedling tray 12 so as to be positioned higher than the support roller 32 (seedling placement portion) and higher than the frame 22 (upper hollow portion 29).

[0084] (Positional relationship between the front guide roller and the support roller in the second spare seedling tray) As shown in Figures 13 and 14, the support rollers 32 are arranged in a line along the front-to-rear direction and are supported by the right frame 22 and the left frame 22 at intervals from each other in the front-to-rear direction so that a gap C2 is formed between the front guide roller 38 and the support rollers 32 and between adjacent support rollers 32.

[0085] Of the multiple support rollers 32, the length (spacing) L21 of the gap C2, which is the distance in the front-to-rear direction between the front guide roller 38 and the first support roller 32(1), is set to be sufficiently large 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).

[0086] The length (spacing) L22 of the gap, which is the distance in the front-rear direction between the first support roller 32(1) and the second support roller 32(2), is set to be sufficiently small. As a result, the length (spacing) L22 is set to be smaller than the length (spacing) L21.

[0087] If we imagine an imaginary line K1 connecting the upper end of the front guide roller 38 and the upper end of the first support roller 32(1) in a side view, the imaginary line K1 overlaps with the second support roller 32(2) in a side view and is located above the axis P2 of the second support roller 32(2) in a side view.

[0088] In the third support roller 32(3), fourth support roller 32(4), and fifth support roller 32(5) adjacent to the rear side of the second support roller 32(2), the gap C2, which is the distance in the front-rear direction between the second support roller 32(2) and the third support roller 32(3), has a length (distance) L23. The gap C2, which is the distance in the front-rear direction between the third support roller 32(3) and the fourth support roller 32(4), has a length (distance) L24. The gap C2, which is the distance in the front-rear direction between the fourth support roller 32(4) and the fifth support roller 32(5), has a length (distance) L25.

[0089] Length (spacing) L23 is set to be greater than length (spacing) L22, length (spacing) L24 is set to be greater than length (spacing) L23, and length (spacing) L25 is set to be greater than length (spacing) L24, so that lengths (spacing) L22, L23, L24, and L25 are larger in that order.

[0090] The length (spacing) L21 is set to be larger than the lengths (spacing) L22, L23, L24, and L25, and the lengths (spacing) L21, L23, L24, and L25 are set to be larger than the outer diameter D2 of the support roller 32. The length (spacing) 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.

[0091] As a result, the lengths (spacing) L23, L24, and L25 of the gaps C2 of the support rollers 32(3), (4), and (5) other than the first support roller 32(1) and the second support roller 32(2) among the multiple support rollers 32 are set to be larger than the length (spacing) L22 of the gaps C2 of the first support roller 32(1) and the second support roller 32(2).

[0092] As described above (overall configuration of the first spare seedling tray) and shown in Figure 4, similar to the spare seedling tray 11, roll-shaped seedlings E can be placed by dropping them between the front guide roller 38 and the support roller 32 (gap C2), or between adjacent support rollers 32 (gap C2).

[0093] (Configuration regarding support of second spare seedling tray) As shown in Figures 3 and 4, the first fulcrum portion 41 of the spare seedling support 11 and the second fulcrum portion 42 of the spare seedling support 12 are swingably connected, and the spare seedling support 12 is swingably supported around the first support axis P11, which is a support axis along the left-right direction of the front part of the spare seedling support 11.

[0094] As a result, the front-to-back ends of the right frame 21 and the left frame 21 of the first spare seedling tray 11 and the front-to-back ends of the right frame 22 and the left frame 22 of the second spare seedling tray 12 are supported in a swingable manner around the first support axis P11, which is a support axis that runs along the left-right direction.

[0095] Since the spare seedling stand 12 is supported so as to be swingable around a first support axis P11 at the front of the spare seedling stand 11, the spare seedling stand 12 can be changed between a working position A11, which is a first working position in which the spare seedling stand 12 is extended forward from the front of the spare seedling stand 11 so as to be connected to the spare seedling stand 11, and a storage position A21, which is a first storage position in which the spare seedling stand 12 is folded upward from the front of the spare seedling stand 11.

[0096] When the spare seedling tray 12 is operated to the working posture A11, the first contact portion 51 of the spare seedling tray 11 and the second contact portion 52 of the spare seedling tray 12 abut against each other, thereby setting (maintaining) the spare seedling tray 12 to the working posture A11.

[0097] When no seedlings E are placed on the spare seedling tray 12 that has been operated to the working posture A11, the spare seedling tray 12 is set (maintained) in the working posture A11 by the abutment of the first contact portion 51 and the second contact portion 52. The first horizontal frame 61 (see FIG. 5) of the spare seedling tray 11 and the second horizontal frame 62 (see FIG. 13) of the spare seedling tray 12 are close to each other, but there is a slight gap between the first horizontal frame 61 and the second horizontal frame 62.

[0098] When seedlings E are placed on the spare seedling tray 12 operated to the working posture A11 and the spare seedling tray 12 tries to move downward, the first horizontal frame 61 and the second horizontal frame 62 come into contact with each other over substantially the entire length in the left-right direction. As a result, 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, stops the spare seedling tray 12 from moving downward, and the spare seedling tray 12 is set (maintained) in the working posture A11.

[0099] As shown in FIGS. 1 and 3, the front holding portion 25 is provided on the support frame 16 at a portion extending upward from the spare seedling tray 11 and below the spare seedling tray 24 . The spare seedling tray 12 can be held in the storage position A21 by manipulating the spare seedling tray 12 to the storage position A21 and holding the locking portion 39 of the spare seedling tray 12 in the front holding portion 25. The spare seedling tray 12 can be operated to the working position A11 by releasing the holding of the front holding portion 25.

[0100] (Overall configuration of the third spare seedling tray) As shown in Figures 15 and 16, the spare seedling tray 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 the seedling placing portion, right and left fulcrum portions 45, right and left engagement portions 46, a locking portion 40, and horizontal frames 65, 66.

[0101] The right and left fulcrum parts 45 are connected to the front end parts, which are the ends of the frame 23 in the fore-and-aft direction, and the horizontal frame 65 is connected across the right and left fulcrum parts 45, and the horizontal frame 65 is connected to the front end parts of the right and left frames 23 along the left-right direction via the fulcrum parts 45.

[0102] The right and left engagement portions 46 are connected to the rear ends, which are the ends in the front-to-rear direction of the frame 23, and the horizontal frame 66 is connected across the right and left engagement portions 46, and the horizontal frame 66 is connected to the rear ends of the right and left frames 23 in the left-right direction via the engagement portions 46. The locking portion 40, which is formed into a channel shape in a plan view, is connected to the rear of one of the frames 23. The overall rigidity of the spare seedling tray 13 is ensured by the right and left frames 23, the horizontal frames 65 and the horizontal frames 66.

[0103] In the spare seedling stand 13, the frame 23 has a flat plate portion 28 and upper and lower hollow portions 29, similar to the frame 21 of the spare seedling stand 11 (see the above (Frame configuration in the first spare seedling stand) and Figures 7 to 12). In this case, the frame 23 does not have the long hole 28b in the flat plate portion 28.

[0104] The spare seedling stand 13 is equipped with the same support rollers 33 as the support rollers 31 of the spare seedling stand 11, and is equipped with the support shaft 34, bearing 35, bearing holder 36, and bearing portion 37 described above in (Configuration of the support rollers in the first spare seedling stand) (Support configuration of the support rollers in the first spare seedling stand). As with the spare seedling stand 11, the support rollers 33 are attached across the flat plate portions 28 of the right and left frames 23 so as to be rotatable around an axis P3 along the left-right direction, which is a direction perpendicular to the longitudinal direction of the frames 23.

[0105] The support rollers 33 are arranged side by side along the front-rear direction, and are supported by the right frame 23 and the left frame 23 at intervals from each other in the front-rear direction so that a gap C3 is formed between adjacent support rollers 33. The length (spacing) L3 in the front-rear direction of the gap C3, which is the distance between adjacent support rollers 33, is set to be larger than the outer diameter D3 of the support rollers 33.

[0106] As described above (overall configuration of the first spare seedling tray) and shown in Figure 4, roll-shaped seedlings E can be placed by dropping them between adjacent support rollers 33 (gap C3), similar to the spare seedling tray 11.

[0107] (Configuration regarding support for the third spare seedling tray) As shown in Figures 3 and 4, the fulcrum portion 43 of the spare seedling stand 11 and the fulcrum portion 45 of the spare seedling stand 13 are swingably connected, and the spare seedling stand 13 is swingably supported around a second support axis P21 that runs along the left-right direction at the rear of the spare seedling stand 11.

[0108] As a result, the front-to-back ends of the right frame 21 and the left frame 21 of the first spare seedling stand 11 and the front-to-back ends of the right frame 23 and the left frame 23 of the third spare seedling stand 13 are supported so as to be swingable around the second support axis core P21 along the left-right direction.

[0109] Since the spare seedling stand 13 is supported so as to be swingable around the second support axis P21 at the rear of the spare seedling stand 11, the spare seedling stand 13 can be changed between a working position A12, which is a second working position in which the spare seedling stand 13 is extended rearward from the rear of the spare seedling stand 11 so as to be connected to the spare seedling stand 11, and a storage position A22, which is a second storage position in which the spare seedling stand 13 is folded upward from the rear of the spare seedling stand 11.

[0110] 17 and 18, round bar-shaped support frames 47 serving as supports are provided along the left-right direction at the front right and left parts of the step 6. When the spare seedling platform 13 is operated to the working posture A12, the lateral frames 66 of the spare seedling platform 13 are placed on the support frames 47, and the rear part of the spare seedling platform 13 is supported by the support frames 47. As a result, the front part of the spare seedling platform 13 is supported by the rear part of the spare seedling platform 11, and the rear part of the spare seedling platform 13 is supported by the step 6 (support frames 47).

[0111] When the spare seedling tray 13 is operated to the working posture A12, the support frame 47 enters between the rear end of the frame 23 and the engagement portion 46, and the engagement portion 46 engages with the support frame 47. As a result, the rear end of the frame 23 and the engagement portion 46 determine the position of the spare seedling tray 13 in the front-rear direction.

[0112] As described above (frame configuration of the first spare seedling tray) and as shown in Fig. 8, the attachment position of the spare seedling tray 11 on the support frames 16-19 can be adjusted in the front-rear direction. By adjusting the attachment position of the spare seedling tray 11 in the front-rear direction, the position of the spare seedling tray 13 in the working posture A12 can be adjusted in the front-rear direction.

[0113] As a result, as shown in Figures 17 and 18, when the spare seedling tray 13 is operated to the working posture A12, the support frame 47 can be set to fit between the rear end of the frame 23 and the engagement portion 46 without coming off, and the engagement portion 46 can be set to engage with the support frame 47 without coming off.

[0114] As shown in FIGS. 1 and 3, the rear holding portion 26 is provided on the support frame 17 at a portion extending upward from the spare seedling tray 11 and below the spare seedling tray 24 . The spare seedling tray 13 can be held in the storage position A22 by manipulating the spare seedling tray 13 to the storage position A22 and holding the locking portion 40 of the spare seedling tray 13 in the rear holding portion 26. The spare seedling tray 13 can be operated to the working position A12 by releasing the holding of the rear holding portion 26.

[0115] (Configuration of the third spare seedling tray and fuel tank on the right) 2 and 18, the fuel tank 48 is disposed inside the right front part of the step 6 and is provided on the machine body 3, and a fuel filler port 48a of the fuel tank 48 protrudes upward through the opening 6a of the step 6. When the right spare seedling tray 13 is operated to the working posture A12, the fuel tank 48 (fuel filler port 48a) is located below the right spare seedling tray 13.

[0116] In the right spare seedling tray 13, a flat cover 49 serving as a protective part is connected to the horizontal frame 66 and extends forward below the support rollers 33. When the right spare seedling tray 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.

[0117] (Posture of the 1st, 2nd, and 3rd spare seedling trays) As shown in Figs. 1 and 3, the spare seedling tray 11 is set in a front-up position relative to the machine body 3, in which the front of the spare seedling tray 11 is higher than the rear of the spare seedling tray 11. When the spare seedling trays 12, 13 are operated to the working positions A11, A12, the spare seedling trays 12, 13 are set to a front-up position relative to the machine body 3 in which the front of the spare seedling trays 12, 13 is higher than the rear of the spare seedling trays 12, 13.

[0118] When the spare seedling tray 12 is operated to the storage position A21, the storage position A21 is set so that the angle B1 in a side view between the spare seedling tray 12 and the spare seedling tray 11 in the storage position A21 is smaller than a right angle. When the spare seedling tray 13 is operated to the storage position A22, the storage position A22 is set so that the angle B2 in a side view between the spare seedling tray 13 in the storage position A22 and the spare seedling tray 11 is smaller than a right angle.

[0119] The storage postures A21 and A22 are set so that the angle B2 is slightly smaller than the angle B1. As a result, the storage posture A21 is set to a posture that is more upright from the spare seedling tray 11 than the storage posture A22, and the storage posture A22 is set to a posture that is closer to the spare seedling tray 11 than the storage posture A21.

[0120] 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 posture A11 and the working posture A12 than the posture in which the spare seedling tray 12 and the spare seedling tray 13 are stacked on the spare seedling tray 11.

[0121] (First Alternative Embodiment of the Invention) As shown in Figure 19, when imagining a virtual line K2 extending in the front-to-back direction along the spare seedling platform 11 in a side view, the first fulcrum portion 41 and the second fulcrum portion 42, the first contact portion 51 and the second contact portion 52 may be configured so that when the spare seedling platform 12 is operated to the working position A11 and no seedlings E are placed on the spare seedling platform 12, the working position A11 of the spare seedling platform 12 is set to a position upward relative to the virtual line K2.

[0122] The front-to-rear length of the spare seedling tray 13 may be set to be shorter than the front-to-rear length of the spare seedling tray 12. With this configuration, when the spare seedling tray 13 is operated to the working posture A12, the rear part of the spare seedling tray 13 may not be supported by the support frame 47 (see Figures 17 and 18).

[0123] In this case, the spare seedling tray 13 may be configured to be set (maintained) in the working position A12 by the abutment of the fulcrum 43 of the spare seedling tray 11 and the fulcrum 45 of the spare seedling tray 13. The configuration relating to the first horizontal frame 61 and the second horizontal frame 62 described above (Configuration relating to supporting the second spare seedling tray) may also be adopted for the horizontal frame 63 of the spare seedling tray 11 (see Figure 5) and the horizontal frame 65 of the spare seedling tray 13 (see Figure 15).

[0124] In the above-mentioned configuration, the fulcrum portions 43, 45 may be configured so that, as shown in Figure 19, when the spare seedling tray 13 is operated into the working posture A12 and no seedlings E are placed on the spare seedling tray 13, the working posture A12 of the spare seedling tray 13 is set to a posture upward relative to the imaginary line K2.

[0125] (Second Alternative Embodiment of the Invention) The front-to-rear length of the spare seedling tray 12 may be set to be shorter than the front-to-rear length of the spare seedling tray 13. In this configuration, as shown in Figures 1 and 2, the front end of the spare seedling tray 11 may be configured to be located at approximately the same position as the front end of the bonnet 9 and the front end of the floor 5 in the front-to-rear direction of the machine body 3.

[0126] (Third Alternative Embodiment of the Invention) As shown in Figure 3, the storage positions A21 and A22 may be set so that the angle B1 in a side view between the spare seedling tray 12 and the spare seedling tray 11 in the storage position A21, and the angle B2 in a side view between the spare seedling tray 13 and the spare seedling tray 11 in the storage position A22, are smaller than a right angle, and angle B1 is slightly smaller than angle B2.

[0127] The spare seedling tray 12 may be configured to assume a vertical position (a position parallel to the support frame 16) when the spare seedling tray 12 is operated to the storage position A21. In this configuration, the angle B1 is slightly larger than a right angle.

[0128] The spare seedling tray 13 may be configured to assume a vertical position (a position parallel to the support frame 17) when the spare seedling tray 13 is operated to the storage position A22. In this configuration, the angle B2 is slightly smaller than a right angle.

[0129] (Fourth Alternative Embodiment of the Invention) In Figure 3, when the spare seedling tray 12 is operated to the storage position A21, the spare seedling tray 12 is stacked above the spare seedling tray 11 throughout the entire tray, and when the spare seedling tray 13 is operated to the storage position A22, it may be configured to be in the position shown in Figure 3. In this configuration, the front holding portion 25 is eliminated, and the front-to-back length of the spare seedling tray 12 is set to be the same as the front-to-back length of the spare seedling tray 11, or slightly shorter than the front-to-back length of the spare seedling tray 11.

[0130] If the front holding section 25 is not eliminated but is left in place, the spare seedling tray 12 may be configured to have a storage position A21 in which it is held by the front holding section 25, and a position in which the spare seedling tray 12 is operated to the storage position A21 in which the entire spare seedling tray 12 is stacked above the spare seedling tray 11. In this configuration, the spare seedling tray 12 has two different storage positions A21.

[0131] (Fifth Alternative Embodiment of the Invention) In Figure 3, when the spare seedling tray 12 is operated to the storage position A21, the spare seedling tray 12 takes the position shown in Figure 3, and when the spare seedling tray 13 is operated to the storage position A22, the spare seedling tray 13 takes a position in which the entire spare seedling tray 13 is stacked above the spare seedling tray 11.

[0132] In this configuration, the rear holding portion 26 is eliminated, and the front-to-rear length of the spare seedling stand 13 may be set to be the same as the front-to-rear length of the spare seedling stand 11, or slightly shorter than the front-to-rear length of the spare seedling stand 11. When a worker gets on and off the floor 5 from the ground and from the floor 5 to the ground, the worker can hold onto both the frame 14 (see FIG. 1) and the support frame 17 as handrails.

[0133] If the rear holding section 26 is not eliminated but is left in place, the spare seedling tray 13 may be configured to have a storage position A22 in which it is held by the rear holding section 26, and a position in which the spare seedling tray 13 is operated to the storage position A22 in which the entire spare seedling tray 13 is stacked above the spare seedling tray 11. In this configuration, the spare seedling tray 13 has two different storage positions A22.

[0134] (Sixth Alternative Embodiment of the Invention) In Figure 3, when the spare seedling tray 13 is operated to the storage position A22, if the spare seedling tray 13 is configured to be stacked above the spare seedling tray 11 throughout the entire tray 13, the spare seedling tray 12 may be configured as described below.

[0135] 20, 21, and 22, a first support part 53, which is a front-rear support part, is provided at the front of the spare seedling tray 11 so as to be movable in the front-rear direction, and a second support part 54, which is a front-rear support part, is supported at the front of the first support part 53 so as to be swingable about an axis P5 along the left-right direction. The spare seedling tray 12 is supported at the front of the second support part 54 so as to be swingable about the first support axis P11.

[0136] The state shown in Figure 20 is a state in which the spare seedling tray 12 has been operated into the working posture A11, and the first support part 53 and the second support part 54 have been operated rearward (inward of the spare seedling tray 11) to a position where the rear of the spare seedling tray 12 contacts the front of the spare seedling tray 11.

[0137] As shown in Fig. 20, when the spare seedling stand 13 is operated to the storage position A22, the spare seedling stand 12, the first support part 53 and the second support part 54 are operated to move forward as shown in Fig. 21, and the position of the axis P5 is moved to a position forward of the front part of the spare seedling stand 11. Next, as shown in Fig. 22, the spare seedling stand 11 and the second support part 54 are operated to swing upward about the axis P5, and the position is changed to face upward relative to the spare seedling stand 11.

[0138] As a result of the above-mentioned operation, the position of the first support shaft core P11 becomes approximately the same as the upper surface of the spare seedling tray 13 in the storage position A22, or a position slightly higher than the upper surface of the spare seedling tray 13 in the storage position A22, so the spare seedling tray 12 is swung backward around the first support shaft core P11 to be placed in the storage position A21 in which the entire spare seedling tray 12 is stacked above the spare seedling tray 13.

[0139] (Seventh Alternative Embodiment of the Invention) In the above-mentioned (sixth embodiment of the invention), the first support part 53 may be provided at the rear of the spare seedling tray 11 so as to be movable in the front-to-rear direction, the second support part 54 may be supported at the rear of the first support part 53 so as to be swingable around an axis P5 along the left-to-right direction, and the spare seedling tray 13 may be supported at the rear of the second support part 54 so as to be swingable around the second support axis P21.

[0140] According to this configuration, the spare seedling tray 12 is operated to a storage position A21 in which the entire tray 12 is stacked above the spare seedling tray 11, and the spare seedling tray 13 is operated to a storage position A22 in which the entire tray 13 is stacked above the spare seedling tray 12 in the storage position A21.

[0141] (Eighth Alternative Embodiment of the Invention) As shown in Figure 23, in the spare seedling loading platform 13, right and left brackets 55 are provided on the right and left engagement portions 46, and a rear guide roller 50, which is a rear guide member having a length spanning the right and left frames 23, is configured to be supported across the right and left brackets 55 so as to be rotatable around axis P6, which is the rear axis, which is an axis along the left-right direction, which is a direction perpendicular to the longitudinal direction of the frame 23.

[0142] As a result, the rear guide roller 50, which is rotatable about an axis P6 along the left-right direction, is provided at the rear end of the spare seedling platform 13 so as to be positioned higher than the support roller 33 (seedling placement portion).

[0143] (Ninth Alternative Embodiment of the Invention) Instead of the front guide roller 38 and the rear guide roller 50, the spare seedling trays 12, 13 may be provided with a fixed cylindrical member (not shown) that does not rotate, a flat front guide plate (not shown) set in an inclined position facing diagonally downward and rearward, or a flat rear guide plate (not shown) set in an inclined position facing diagonally downward and forward.

[0144] (Tenth Alternative Embodiment of the Invention) As shown in Figure 24, when placing roll-shaped seedlings E on the spare seedling stands 11, 12, and 13, the roll-shaped seedlings E may be stacked and placed in a seedling box 56, and this seedling box 56 may then be placed on the spare seedling stands 11, 12, and 13. In FIG. 24, one seedling box 56 is placed on each of the spare seedling trays 11, 12, 13, but the seedling boxes 56 loaded with roll-shaped seedlings E may be stacked vertically.

[0145] (Eleventh Alternative Embodiment of the Invention) The seedling placing section of the spare seedling tray 11 may be configured to include a mixture of support rollers 31 or support members (not shown) whose main function is to support the seedlings E, and support rollers 31 whose main function is to transport the seedlings E in the fore-and-aft direction. In this case, the support roller 31, whose main function is to support the seedlings E, may be configured as a fixed, non-rotating member. The support member may be configured as a fixed, non-rotating rod-shaped member or a long, thin, flat member. The above-mentioned configuration may be adopted for the spare seedling tray 12 and the spare seedling tray 13.

[0146] The spare seedling platform 11 may be configured such that fixed, non-rotating support rollers 31 and rotatable support rollers 31 are alternately arranged in the front-rear direction. In this case, the fixed support rollers 31 that do not rotate have a function of supporting the seedlings E, but have little or no function of transporting the seedlings E in the front-to-rear direction. The rotatable support rollers 31 have both a function of supporting the seedlings E and a function of transporting the seedlings E in the front-to-rear direction. The above-mentioned configuration may be adopted for the spare seedling tray 12 and the spare seedling tray 13.

[0147] (Twelfth Alternative Embodiment of the Invention) An ultrasonic or infrared type boarding / disembarking detection unit (not shown) may be provided so as to detect the boarding / disembarking actions of the worker from the ground to the floor 5 and from the floor 5 to the ground, and an electric motor (not shown) may be provided as a storage mechanism that drives the spare seedling tray 13 to oscillate around the second support axis P21.

[0148] In this way, when the spare seedling tray 13 is operated to the working position A12, and the boarding / disembarking detection unit detects the operator's boarding / disembarking actions from the ground to the floor 5 and from the floor 5 to the ground, the electric motor automatically operates the spare seedling tray 13 to the storage position A22 or a position in which it is stacked on the spare seedling tray 11 (storage position A22).

[0149] (Thirteenth embodiment of the invention) In the spare seedling trays 11, 12, 13, the support rollers 31, 32, 33 may be eliminated, and a flat member may be attached across the right and left frames 21, 22, 23 as a seedling placement section. [Industrial Applicability]

[0150] The present invention can be applied to riding rice transplanters. [Explanation of symbols]

[0151] 3. Aircraft 5th Floor 6 Steps 11 Spare seedling tray (first spare seedling tray) 12 Spare seedling tray (second spare seedling tray) 13 Spare seedling tray (third spare seedling tray) 16 Support frame 17 Support frame 18 Support frame 19 Support frame 20 Support frame 25 Front holding part 26 Rear holding part 28b Long hole (position adjustment part) 46 Engagement part 47 Support frame (support part) 48 Fuel Tank 49 Cover (Protection Department) 53 1st support part (front and back support part) 54 2nd support part (front and back support part) A11 Working Posture (First Working Posture) A12 Working Posture (Second Working Posture) A21 Storage position (first storage position) A22 Storage position (second storage position) B1 angle B2 angle P11 1st support shaft center P21 2nd support shaft center

Claims

1. a front support frame provided at the front of the aircraft; a rear support frame disposed on a front portion of the fuselage and spaced rearward from the front support frame; A first spare seedling stand supported by the front support frame and the rear support frame; a second spare seedling stand supported on the front part of the first spare seedling stand so as to be changeable between a first working position in which the first spare seedling stand is extended forward from the front part of the first spare seedling stand so as to be connected to the first spare seedling stand, and a first storage position in which the first spare seedling stand is folded upward from the front part of the first spare seedling stand around a first support axis along the left-right direction of the front part of the first spare seedling stand; A third spare seedling stand is supported at the rear of the first spare seedling stand so as to be changeable between a second working position in which the third spare seedling stand extends rearward from the rear of the first spare seedling stand so as to be connected to the first spare seedling stand, and a second storage position in which the third spare seedling stand is folded upward from the rear of the first spare seedling stand, around a second support axis along the left-right direction of the rear of the first spare seedling stand; A front holding part capable of holding and releasing the second spare seedling tray operated to the first storage position is provided at a portion of the front support frame extending upward from the first spare seedling tray, A rear holding portion capable of holding and releasing the third spare seedling tray operated to the second storage position is provided at a portion of the rear support frame extending upward from the first spare seedling tray, A riding rice transplanter in which the first storage position and the second storage position are set to positions closer to the first working position and the second working position than the position in which the second spare seedling tray and the third spare seedling tray are stacked on the first spare seedling tray.

2. The first storage posture is set to a posture that is more upright than the second storage posture from the first spare seedling stand, The riding rice transplanter according to claim 1, wherein the second storage position is set to a position closer to the first spare seedling platform than the first storage position.

3. The first storage posture is set so that an angle between the second spare seedling tray and the first spare seedling tray in the first storage posture in a side view is an angle smaller than a right angle, The riding rice transplanter of claim 2, wherein the second storage position is set so that the angle between the third spare seedling tray and the first spare seedling tray in the second storage position in a side view is smaller than a right angle.

4. a front-rear support part that supports one of the second spare seedling tray and the third spare seedling tray so as to be able to change its position around one of the first support shaft core and the second support shaft core, is provided on the first spare seedling tray so as to be able to move from one of the front and rear parts of the first spare seedling tray to one of the front and rear parts, and is able to change its position upward with respect to the first spare seedling tray when moved from one of the front and rear parts of the first spare seedling tray to one of the front and rear parts; The other of the second spare seedling stand and the third spare seedling stand can be changed to a position in which it is stacked above the first spare seedling stand over the entire other of the second spare seedling stand and the third spare seedling stand, A riding rice transplanter as described in claim 2 or 3, wherein the front and rear support parts can be moved forward or backward and changed in position upward, so that one of the second spare seedling tray and the third spare seedling tray can be stacked above the other of the second spare seedling tray and the third spare seedling tray, which has been operated to a position stacked on the first spare seedling tray, over the entirety of either the second spare seedling tray or the third spare seedling tray.

5. A riding rice transplanter as described in any one of claims 1 to 4, wherein the front-to-back length of one of the second spare seedling tray and the third spare seedling tray is set to be shorter than the front-to-back length of the other of the second spare seedling tray and the third spare seedling tray.

6. A fuel tank is provided on the machine body so as to be located below the third spare seedling tray operated to the second working posture, A riding rice transplanter as described in any one of claims 1 to 5, wherein a protective section that covers the upper part of the fuel tank when the third spare seedling platform is operated to the second working position is provided on the third spare seedling platform.

7. A floor provided on the aircraft; A step is provided at the rear of the aircraft and positioned higher than the floor, A support portion for supporting a rear portion of the third spare seedling tray operated to the second working posture is provided on the step, A riding rice transplanter as described in any one of claims 1 to 6, wherein the third spare seedling platform engages with the support portion when operated to the second working posture, and an engagement portion is provided on the third spare seedling platform to determine the fore-and-aft position of the third spare seedling platform.

8. The riding rice transplanter according to claim 7, further comprising a position adjustment unit capable of adjusting the mounting position of the first spare seedling tray on the support frame in the forward / backward direction.

9. an entry / exit detection unit that detects an entry / exit action of a worker on the floor; A riding rice transplanter as described in claim 7 or 8, further comprising a storage mechanism that automatically operates the third spare seedling tray to the second storage position or a position stacked on the first spare seedling tray based on detection by the boarding / disembarking detection unit.

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