JP2013153771A - Agricultural implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an agricultural implement capable of simply and rapidly carrying out state changeover of a plurality of preliminary seedling-loading trays.SOLUTION: There is provided an agricultural implement provided with a supporting frame 19 provided at a side part of a body, a plurality of preliminary seedling-loading trays 20u, 20m, 20d supported by a link mechanism 60 on the supporting frame 19. The preliminary seedling-loading trays 20u, 20m, 20d can be switched by a link mechanism 60 into an overlapping state in which the preliminary seedling-loading trays 20u, 20m, 20d overlap in vertical multistage in a plan view, and into a deployed state in which the preliminary seedling-loading trays 20u, 20m, 20d are deployed in a substantially straight line in a longitudinal direction. The rear part of the front side preliminary seedling-loading trays 20u (20m) and the front part of the rear side preliminary seedling-loading trays 20m (20d) are each positioned by contacting the rear part of the front side preliminary seedling-loading trays 20u (20m) with the front part of the rear side preliminary seedling-loading trays 20m (20d) in a pair of the preliminary seedling-loading trays 20u, 20m, 20d to deploy in a substantially straight line in a longitudinal direction.

Description

  The present invention relates to an agricultural working machine including a support frame provided on a lateral side portion of a machine body and a plurality of preliminary seedling platforms supported by the support frame.

  As a conventional technique, for example, as disclosed in Patent Document 1, a reserve seedling stand (8 in FIG. 1 of Patent Document 1) arranged at the front of the traveling machine body is used as a plurality of seedling receiving plates (patents). The first form in which 26u, 26m, and 29d) in FIG. 1 of Document 1 are arranged in a plurality of upper and lower stages, and a plurality of seedling receiving plates (26u, 26m, and 29d in FIG. 4 of Patent Document 1) are arranged in series in front and rear. A riding type rice transplanter configured to be switchable to a second form extending forward is known.

Japanese Patent Laid-Open No. 2007-135506 (see FIGS. 1, 4, 14, 15, and 26)

  In the stand for the preliminary seedlings of Patent Document 1, the rear part of the upper seedling receiving plate, the front part and the rear part of the middle seedling receiving board, and the front part of the lower seedling receiving body are respectively above the seedling receiving surface. A stopper (38 in FIG. 14 and FIG. 15 in FIG. 15 and 38 in FIG. 26) is provided that can be switched between a protruding standing posture and a lying retracted posture that is recessed from the seedling receiving surface. Thereby, in the 1st form of a reserve seedling stand, it can prevent that the seedling from a seedling receiving body falls back and forth by changing a posture to a standing posture, and in the 2nd form of a reserve seedling stand, a stopper By changing the posture to the storage retracted posture, the movement of the seedlings between the seedling receivers in the state where they are juxtaposed in front and rear is permitted, and from the heel or the like to the seedling setting stand (15 in FIG. 1 of Patent Document 1) It is configured to be able to replenish seedlings.

Therefore, it is necessary to change the posture of the plurality of stoppers every time the first and second forms of the reserve seedling platform are switched, and it takes time and effort to switch the state of the reserve seedling platform, and the state of the reserve seedling platform There was room for improvement from the viewpoint of improving the workability of the switching work.
An object of this invention is to implement | achieve the agricultural machine which can change the attitude | positions of a front part and a rear part movable stopper simply and rapidly, and can perform the state switching of several reserve seedling stands simply and rapidly.

[I]
(Constitution)
The first feature of the present invention is that the agricultural machine is configured as follows.
A support frame provided on a lateral side portion of the airframe, and a plurality of preliminary seedling platforms supported by the support frame, wherein the plurality of preliminary seedling platforms are overlapped in a plan view in an upper and lower stage. And the plurality of preliminary seedling platforms are configured to be switchable to a deployed state in which the plurality of preliminary seedling platforms are deployed in a substantially straight line in the front-rear direction. Provided with front and rear movable stoppers, and the front and rear movable stoppers are placed on the preliminary seedling stage and an action posture for preventing movement of seedlings placed on the preliminary seedling stage. When the posture of one of the front and rear movable stoppers is changed to the active posture, the other of the front and rear movable stoppers becomes the active posture. Posture change, the front and rear The front and rear movable stoppers are interlocked and connected via an interlocking mechanism so that when one of the movable stoppers is changed to a non-acting posture, the other of the front and rear movable stoppers is changed to a non-active posture. The interlocking mechanism is arranged on the inner side of the machine body from the seedling placement surface of the preliminary seedling table and on the outer side of the machine body from the support frame.

(Function)
According to the first feature of the present invention, by changing the posture of one of the front and rear movable stoppers of the preliminary seedling stage, the other of the front and rear movable stoppers of the preliminary seedling stage is interlocked by the interlocking mechanism. By being changed, it is possible to change the posture of both the front and rear movable stoppers of the preliminary seedling stage. Thereby, in the case of switching the state of a plurality of preliminary seedling platforms, the postures of the front and rear movable stoppers can be easily and quickly changed, and the state of the plurality of preliminary seedling platforms can be easily and quickly switched. .

(Effect of the invention)
According to the 1st characteristic of this invention, the workability | operativity of the state switching operation | work of a some preliminary seedling stand can be improved.

[II]
(Constitution)
The second feature of the present invention is that the agricultural machine is configured as follows.
A support frame provided on a lateral side portion of the airframe, and a plurality of preliminary seedling platforms supported by the support frame, wherein the plurality of preliminary seedling platforms are overlapped in a plan view in an upper and lower stage. And the plurality of preliminary seedling platforms are configured to be switchable to a deployed state in which the plurality of preliminary seedling platforms are deployed in a substantially straight line in the front-rear direction. Provided with front and rear movable stoppers, and the front and rear movable stoppers are placed on the preliminary seedling stage and an action posture for preventing movement of seedlings placed on the preliminary seedling stage. When the posture of one of the front and rear movable stoppers is changed to the active posture, the other of the front and rear movable stoppers becomes the active posture. Posture change, the front and rear The front and rear movable stoppers are interlocked and connected via an interlocking mechanism so that when one of the movable stoppers is changed to a non-acting posture, the other of the front and rear movable stoppers is changed to a non-active posture. The front and rear movable stoppers are arranged across the upper preliminary seedling stage and the lower preliminary seedling stage in the overlapping state.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
According to the second feature of the present invention, by changing the posture of the front and rear movable stoppers to the working posture, the movement of the seedlings placed on the upper and lower two-stage reserve seedling placing stands is prevented. By changing the posture of the front and rear movable stoppers to the non-acting posture, it is possible to allow the movement of the seedlings placed on the upper and lower two-stage preliminary seedling placing platforms. Thereby, in the case of switching the state of a plurality of preliminary seedling platforms, the number of front and rear movable stoppers to change the posture can be reduced, and the status switching of the plurality of preliminary seedling platforms can be performed more simply and quickly. it can.

(Effect of the invention)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the 2nd characteristic of this invention, the workability | operativity of the state switching operation | work of a some preliminary seedling stand can be improved further.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the agricultural machine according to the second feature of the present invention.
An open portion is provided at the upper and lower intermediate portions of the front and rear movable stoppers so that seedlings can be taken in and out.

(Function)
According to the third feature of the present invention, the “action” described in the preceding item [II] is provided in the same manner as the second feature of the present invention. In addition, the following “action” is provided.
According to the third feature of the present invention, the front or rear movable stopper is changed to the working posture, and is opened to the lower preliminary seedling stage among the upper and lower upper secondary seedling stage. The seedling can be taken in and out through the section. As a result, even in a state where the front or rear movable stopper is changed to the action posture, the seedlings can be taken in and out of the lower preliminary seedling stage among the upper and lower two stages of the preliminary seedling stage. It can be done without hindrance.

(Effect of the invention)
According to the third feature of the present invention, the “effect of the invention” described in the preceding item [II] is provided in the same manner as the second feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the third feature of the present invention, it is possible to easily and quickly change the state of the plurality of preliminary seedling platforms while eliminating the adverse effect that makes it difficult for the seedlings to be taken in and out of the preliminary seedling platforms.

[IV]
(Constitution)
A fourth feature of the present invention resides in the following configuration in the agricultural machine of the first to third features of the present invention.
In the unfolded state, a step is formed between the plurality of preliminary seedling platforms so that the heights of the plurality of preliminary seedling platforms are gradually lowered toward the rear side.

(Function)
According to the 4th characteristic of this invention, it is equipped with the "action" of previous clause [I]-[III] similarly to any one of the 1st-3rd characteristic of this invention. It has such “action”.
According to the fourth feature of the present invention, for example, the seedling placed from the heel or the like on the front part of the plurality of preliminary seedling platforms in the unfolded state is transferred by the step formed between the front and rear preliminary seedling platforms. Utilizing its own weight, it can be moved without difficulty to the rear of the plurality of preliminary seedling platforms in the unfolded state. This makes it difficult for the seedlings placed on the front part of the plurality of preliminary seedling platforms from the cocoon or the like to stop on the preliminary seedling platforms during the movement.

(Effect of the invention)
According to the fourth aspect of the present invention, as in any one of the first to third aspects of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [III] is provided. The following “effects of the invention” are provided.
According to the 4th characteristic of this invention, the workability | operativity of the replenishment work of the seedling from a cocoon etc. can be improved.

Overall side view of a riding type rice transplanter with the spare seedling placement part overlapped Overall plan view of riding type rice transplanter with spare seedling placement part overlapping Overall side view of riding type rice transplanter with the spare seedling placement part unfolded Overall plan view of a riding type rice transplanter with the spare seedling placement part unfolded Side view of spare seedling placement part in overlapping state Cross-sectional plan view of spare seedling placement part in overlapping state Front view of spare seedling placement part in overlapping state Side view of spare seedling placement part in unfolded state Plan view of spare seedling placement part in unfolded state Front view of spare seedling placement part in unfolded state Longitudinal front view of mounting part of seedling receiver Longitudinal front view near the support frame of the spare seedling placement part in the overlapping state The top view of the attachment part of the 1st-3rd frame member Side view of the vicinity of the operation tool when the spare seedling placement part overlaps Plan view of the vicinity of the operation tool when the spare seedling placement part is overlapped Side view of the vicinity of the operating tool when the spare seedling placement part is deployed Longitudinal front view of the vicinity of the operating tool when the spare seedling placement part is deployed A perspective view showing the structure of the front and rear movable stoppers Vertical side view of spare seedling placement part in unfolded state The schematic side view of the reserve seedling mounting part in 1st another form of implementation of invention The schematic side view of the reserve seedling mounting part in 2nd another form of implementation of invention Side view of the vicinity of the front movable stopper in the third alternative embodiment of the invention Detailed view of the vicinity of the front movable stopper in the fourth alternative embodiment of the invention Schematic side view of spare seedling placement part in reference form The schematic side view of the reserve seedling mounting part in 5th another form of implementation of invention

[Overall configuration of riding rice transplanter]
The overall configuration of the riding rice transplanter will be described with reference to FIGS. FIG. 1 is an overall side view of the riding rice transplanter with the spare seedling placement unit F in an overlapping state, and FIG. 2 is an overall plan view of the riding rice transplanter with the spare seedling placement unit F in an overlapping state. is there. FIG. 3 is an overall side view of the riding rice transplanter with the preliminary seedling placement unit F in the deployed state, and FIG. 4 is an overall plan view of the riding rice transplanter with the preliminary seedling placement unit F in the deployed state. is there.

  As shown in FIG. 1 to FIG. 4, a driving unit 3 is provided on a machine body supported by a front wheel 1 and a rear wheel 2, and a seedling planting device is provided at a rear part of the machine body via a hydraulic cylinder 4 and a lifting link mechanism 5. A riding type rice transplanter is configured by 6 being supported to be movable up and down.

  The seedling planting device 6 is configured in a six-row planting specification, and includes three transmission cases 7, a planting case 8 that is rotatably supported on the right and left lateral sides of the rear portion of the transmission case 7, and planting A pair of planting arms 8 a provided at both ends of the case 8, a grounding float 9, a seedling platform 10 on which seedlings are placed, and the like are provided. As a result, the planting case 8 is rotationally driven as the seedling platform 10 is driven back and forth to the left and right, and the planting arm 8a alternately takes out the seedlings from the lower part of the seedling platform 10 and puts them on the rice field. Plant.

  A driver's seat 12 is provided at the rear of the floor 11 in the driver 3, and a fertilizer application device 13 that supplies fertilizer to the rice field with planting seedlings is provided on the rear side of the driver's seat 12. A bonnet 14 covering the engine E is provided in front of the floor 11, and a steering handle for steering the front wheel 1 is provided at the upper part of the bonnet 14. Right and left lateral sides of the bonnet 14 are provided with right and left steps 15 connected to the floor 11, and right and left auxiliary steps 16 are provided on both lateral sides of the floor 11 and step 15. It has been.

  An operation arm 17 capable of operating the riding type rice transplanter from the front of the aircraft is supported in a swingable manner around the left and right axis of the front of the engine frame 18 at the center of the left and right of the front of the aircraft. The posture can be changed between a standing posture standing on the front side of the bonnet 14 (the solid line posture in FIG. 3) and a lying posture lying forward and downward from this standing posture (a two-dot chain line posture in FIG. 3). Yes. In the lying posture of the operation arm 17, the downward swing of the operation arm 17 is restricted, and the operation arm 17 can be operated to push down the front part of the machine body. As a result, the riding type rice transplanter can be operated from the front of the aircraft while pushing down the front of the aircraft with the operation arm 17, so that the crossing work can be easily performed.

[Detailed structure of spare seedling placement part]
Based on FIGS. 1-17, the detailed structure of the reserve seedling mounting part F is demonstrated. FIG. 5 is a side view of the spare seedling placement unit F in the overlapping state, and FIG. 6 is a cross-sectional plan view of the spare seedling placement unit F in the overlapping state (plan view of the intermediate seedling seeding stage 20m). FIG. 7 is a front view of the spare seedling placement unit F in an overlapping state. 8 is a side view of the spare seedling placement unit F in the deployed state, FIG. 9 is a plan view of the preliminary seedling placement unit F in the deployed state, and FIG. 10 is a spare seedling in the deployed state. It is a front view of the mounting portion F (a front view of the preliminary seedling placing stand 20m at the front and rear center).

  FIG. 11 is a longitudinal front view of the attachment portion of the seedling receiver 31, and FIG. 12 is a longitudinal front view of the vicinity of the support frame 19 of the preliminary seedling placement portion F in an overlapping state. FIG. 13 is a plan view of the attachment portion of the first to third frame members 30, 50, 51. FIG. 13 (a) shows the upper stage seedling mounting base 20u, and FIG. 13 (b) shows the middle stage spare. The seedling stage 20m is shown in FIG. 13C, and the lower stage seedling stage 20d is shown in FIG. FIG. 14 is a side view of the vicinity of the operation tool 46 when the spare seedling placement unit F is overlapped, and FIG. 15 is a plan view of the vicinity of the operation tool 46 when the spare seedling placement unit F is overlapped.

  16 is a side view of the vicinity of the operation tool 46 when the preliminary seedling placement unit F is in the deployed state, and FIG. 17 is a longitudinal front view of the vicinity of the operation tool 46 when the preliminary seedling placement unit F is in the deployed state. . In the following description, the spare seedling placement part F equipped on the left side of the front part of the aircraft will be described as an example. However, other configurations are the same except that the left and right sides are different.

  As shown in FIGS. 1 and 2, an engine frame 18 extends forward from the engine E, and left and right support frames 19 that support the preliminary seedling placement portion F are fixed to the engine frame 18. . As a result, left and right support frames 19 are mounted on the left and right lateral sides of the front of the machine body.

  On the laterally outer side of the support frame 19, three stages of preliminary seedling platforms 20 are arranged one above the other, and preliminary seedling placement units F are arranged on the right and left sides of the front part of the machine body. In the spare seedling placement section F, the overlapping state (the state shown in FIGS. 1 and 2) in which the three spare seedling placement bases 20 are overlapped in plan view, and the three preliminary seedling placement bases 20 are slightly inclined. It is configured to be switchable to a developed state (the state shown in FIG. 3 and FIG. 4) that is inclined substantially rearward and downward. In the following description, among the three stages of the spare seedling stage 20 in the overlapping state, the upper stage seedling stage is indicated as 20u, the middle stage seedling stage is indicated as 20m, and the lower stage spare seedling stage is indicated as 20m. The platform is displayed as 20d. Further, the seedling receiver constituting the upper preliminary seedling stage 20u is indicated as 31u, the seedling receiver constituting the middle preliminary seedling stage 20m is indicated as 31m, and the lower preliminary seedling stage 20d is configured. The seedling receiver is displayed as 31d.

  As shown in FIGS. 5 to 7 and 12, a bracket 21 is fixed to the upper portion of the support frame 19, and a boss portion 22 is formed between the bracket 21 and the upper end portion of the support frame 19. Yes. The boss portion 22 is formed with a left and right through hole, and a central support shaft 23 is supported in the through hole so as to be rotatable around a horizontal axis P1. A boss of the first frame member 30 in the shape of a square pipe that is long in the front-rear direction with a central boss 61A of a first linkage link 61, which will be described later, being rotatably fitted to the outer end of the central support shaft 23. The part 30a is fitted and fixed.

  Angle-shaped front and rear frames 24 and 25 are fixed to the front and rear portions of the bracket 21, and the front and rear frames 24 and 25 are on the inner surface side of the front and rear portions of the first frame member 30. It is fastened and fixed. Thus, the first frame member 30 is fixed to the upper portion of the support frame 19 via the front and rear frames 24 and 25, the bracket 21, and the central support shaft 23.

  As shown in FIGS. 5 to 7, the intermediate stage seedling placing stand 20 m includes a first frame member 30 and a seedling receiving body 31 m connected to the first frame member 30. A U-shaped front and rear brackets 32 and 33 having a longitudinal sectional shape opened downward in a side view are fixed to the upper surface side of the front and rear portions of the first frame member 30.

  The seedling receiver 31m is made of a resin and is formed in a rectangular shape that is long in the front-rear direction in a plan view, and left and right side portions thereof have left and right protrusions protruding upward from a seedling placement surface 31A on which the seedling G is placed. Sidewall portions 31a are formed. The front part and the rear part of the seedling receiver 31m are open in the front-rear direction, and no walls are provided at the front part and the rear part of the seedling receiver 31m.

  An opening 31b is formed in the left and right central portion of the front portion of the seedling receiver 31m, and is recessed in the rear side in a plan view and opened upward and downward. An opening 31c is formed which is recessed in the front side in plan view and is open at the top and bottom. Thereby, in the unfolded state of the preliminary seedling placement portion F, which will be described later, in the cooperation with the opening portions 31b, 31c of the front and rear seedling receivers 31u, 31d, The manual insertion holes H can be formed at two locations, the front part and the rear part of the seedling placement surface 31A of the seedling receiving body 31m when the preliminary seedling placement part F is deployed (see FIG. 9).

  As a result, a hand is inserted from the upper side of the front and rear hand insertion holes H, and the seedling G placed on the preliminary seedling placement table 20m at the front and rear center when the preliminary seedling placement unit F is in the expanded state is easily moved upward. It can be pulled up and taken out, and the workability of taking out the seedling G from the preliminary seedling placing stand 20m in the expanded state can be improved.

  A frame-shaped frame 34 formed in a U shape in a plan view by a round bar is fastened and fixed to the lower part of the seedling receiver 31m from the lower side. A bracket 35 is fixed. Thereby, the seedling receiver 31 is supported by the frame-like frame 34 fixed to the front and rear connecting brackets 35.

  As shown in FIG. 5 to FIG. 7 and FIG. 11, the front and rear connecting brackets 35 are connected to each other so as to be rotatable around the left and right axial centers a of the front and rear brackets 32 and 33, respectively. As a result, as shown in FIG. 11A, the seedling receiver 31m and the frame-shaped frame 34 are supported on the first frame member 30 side so as to be swingable about the left and right axis a.

  A positioning contact portion 35a is formed in the lower part of the front and rear connecting brackets 35. The positioning contact portion 35a contacts the outer surface side of the first frame member 30, so that the seedling receiver 31m and the frame shape are formed. The range of the downward swing of the frame 34 is restricted.

  The height of the front bracket 32 is set to be higher than the height of the rear bracket 33, whereby the seedling placement surface 31A of the seedling receiving body 31m connected to the front and rear brackets 32, 33 is obliquely rearward and downward. It is comprised so that it may incline.

  In the upper part of the front and rear connection brackets 35, long slots 35 b are formed on the left and right, and the front and rear brackets 32, 33 are connected to the slot 35 b via a support shaft 36. A plate-like member 35 c is fixed to the upper ends of the front and rear connecting brackets 35.

  As shown in FIGS. 7 and 11 (b), the seedling receiver 31m and the frame-like frame 34 are swung upward around the axis a in the left-right direction, and the elongated hole 35a is moved downward along the support shaft 36. By pushing the seedling receiver 31m and the frame-shaped frame 34 slightly downward so as to move, the plate-like members 35c of the front and rear connecting brackets 35 abut against the inner ends of the front and rear brackets 32, 33, The state where the seedling receiver 31m and the frame-shaped frame 34 are erected upward and swinging can be maintained. As a result, the standing stage 20m in the middle stage is set up in an upright position (position shown by a two-dot chain line in FIGS. 7 and 10) and used in a downward position (in FIGS. 7 and 10). The posture can be changed to a posture of a solid line), and these postures can be held.

  As shown in FIG. 6, a front boss portion 30 b in which a left and right through hole is formed is formed at the front end portion of the first frame member 30, and at the rear end portion of the first frame member 30, A rear boss portion 30c is formed in which left and right through holes are formed.

  As shown in FIG. 5 to FIG. 7 and FIG. 12, on the upper surface side in the front and rear central portion of the first frame member 30, a vertically long rectangular pipe-shaped vertical frame 30d extends. A first support member 37 is fixed to the upper end portion.

  As shown in FIGS. 12 and 14, the first support member 37 is formed in a U-shape in which a longitudinal sectional shape in a front view is opened upward, and a lower end portion thereof is fixed to an upper end of the vertical frame 30 d. ing. Accordingly, the second frame member 50 of the upper preliminary seedling table 20u enters from the upper side between the outer plate and the inner plate of the first support member 37 in the overlapping state of the preliminary seedling placement portion F, and the upper stage The preliminary seedling stage 20u is supported by the vertical frame 30d via the first support member 37.

  By supporting the second frame member 50 on the vertical frame 30d, the upper preliminary seedling stage 20u can be stably supported, and not only the upper preliminary seedling stage 20u but also a link mechanism 60 described later. Thus, it is possible to effectively prevent rattling or the like of the lower preliminary seedling table 20d connected to each other.

  An outer inclined portion 37A inclined obliquely outward and upward is formed at the upper end portion of the outer plate of the first support member 37, and inclined upward and obliquely upward at the upper portion of the inner plate of the first support member 37. An inner inclined portion 37B is formed.

  When the preliminary seedling placement portion F is switched from the expanded state to the overlapped state, the tip of the lock pin 43 of the lock mechanism 40 described later contacts the outer inclined portion 37A formed on the outer plate of the first support member 37. The lock pin 43 of the lock mechanism 40 to be described later automatically moves inward against the urging force of the elastic spring 44. As a result, when the preliminary seedling placement unit F is switched from the deployed state to the overlapped state, the preliminary seedling placement unit F is duplicated from the deployed state without pulling the lock operation tool 45 of the lock mechanism 40 described later inside. It is possible to switch to a state, and it is possible to easily switch the state of the preliminary seedling placement unit F.

  When switching the preliminary seedling placement portion F from the expanded state to the overlapping state, the second frame member 50 of the upper preliminary seedling placement base 20u is guided by the inner inclined portion 37B formed on the inner plate of the first support member 37. While being done, it enters between the outer plate and the inner plate of the first support member 37. As a result, the upper stage seedling platform 20u can be easily switched from the deployed state to the overlapped state, and the preliminary seedling placement unit F can be prevented from rattling in the left-right direction of the upper stage seedling platform 20u in the overlapped state. It can be effectively prevented.

  A support hole portion 37C for supporting a support pin 42 of the lock mechanism 40 described later is formed in the front portion of the outer plate of the first support member 37. The shape of the support hole portion 37C is the preliminary seedling placement portion F. Is formed in a shape along the rotation trajectory of the support pin 42 when switching between the expanded state and the overlapped state, and the shaft center of the support pin 42 is supported while the support pin 42 enters the support hole portion 37C. It is formed in a shape that enters the hole 37C.

  A lock hole 37D into which a lock pin 43 of the lock mechanism 40 described later is inserted is formed in the rear portion of the outer plate of the first support member 37, and the tip of the lock pin 43 of the lock mechanism 40 enters into the lock hole 37D. Thus, the state in which the second frame member 50 enters between the outer plate and the inner plate of the first support member 37 can be maintained.

  As shown in FIGS. 12, 14, and 15, a lock mechanism 40 that locks the preliminary seedling placement portion F in the expanded state and the overlapped state is provided on the upper portion of the second frame member 50 in the front and rear central portion. . On the upper surface side of the second frame member 50, a U-shaped bracket 41 having a longitudinal sectional shape opened upward in a front view is fixed.

  A left and right support pin 42 is fitted into the front portion of the bracket 41 and is fixed so as to protrude laterally outward. A left and right through hole is formed in the rear portion of the bracket 41, and a left and right lock pin 43 is fitted into the through hole. An elastic spring 44 is mounted across the lock pin 43 and the bracket 41, and the elastic spring 44 biases the lock pin 43 outward (the side where the tip of the lock pin 43 protrudes from the outer surface of the bracket 41). Has been.

  A tapered portion 43a is formed at the distal end portion of the lock pin 43, and the tapered portion 43a allows the distal end of the lock pin 43 to be comfortably locked to the lock hole 37D (locking portion) of the first support member 37 (second support member 38). The lock pin 43 can be inserted into the hole 38D) when the tip of the lock pin 43 comes into contact with the outer inclined portion 37A (outer inclined portion 38A) of the first support member 37 (second support member 38). It can be moved inward without difficulty.

  A lock operation tool 45 formed in a loop shape by a round bar is fixed to the inner end portion of the lock pin 43. The size of the opening formed in the loop shape of the lock operation tool 45 is determined by the operator. The size is set such that a plurality of fingers can be inserted (see FIG. 15).

  As a result, when the lock operating tool 45 is pulled inward against the urging force of the elastic spring 44, the distal end portion of the lock pin 43 is locked to the lock hole 37 </ b> D (the second support member 38). The unlocking state (the state shown in FIG. 15B) of the lock mechanism 40 that has come out of the lock hole 38D) can appear, and the pulling operation to the inside of the lock operating tool 45 is stopped, so that the biasing force of the elastic spring 44 The lock state (state shown in FIG. 15A) of the lock mechanism 40 in which the distal end portion of the lock pin 43 enters the lock hole 37D (lock hole 38D) of the first support member 37 (second support member 38) can be revealed. .

  On the rear part of the second frame member 50, an operating tool 46 that is gripped by an operator when switching the state of the spare seedling placement unit F is provided. The operation tool 46 includes a round pipe-shaped frame member 46a and a resin grip 46b attached to the frame member 46a.

  Although not shown, a configuration in which the operation tool 46 is installed at different positions may be employed, or a configuration in which the operation tool 46 is installed in parts other than the second frame member 50 may be employed. A configuration equipped with 46 may be employed. Specifically, for example, the third frame member 51 may be equipped with the operation tool 46 so that the operation tool 46 can be easily operated at a low height, for example, the link mechanism 60 (first to third linkages). You may employ | adopt the structure which equips the links 61-63) with the operation tool 46. FIG. Further, for example, an operation tool 46 is provided at the front end portion and the rear end portion of the second or third frame member 50, 51 so that the operation from the front side and the rear side of the preliminary seedling placement portion F can be performed more easily. May be.

  The base portion of the frame member 46a is fixed to the inner surface side of the rear portion of the second frame member 50, and the frame member 46a extends inward from the portion fixed to the second frame member 50 and extends inwardly. A frame member 46a is formed in a shape that extends substantially horizontally forward from the end, and extends obliquely forward and upward from an extended end that extends substantially horizontally forward, and is inclined obliquely upward and forward. The grip 46b is externally fitted to the part.

  A predetermined gap is formed between the grip portion 46 b of the operation tool 46 and the outer end of the lock operation tool 45, so that the lock operation tool 45 resists the urging force of the elastic spring 44. The pulling operation is allowed.

  As shown in FIGS. 14 and 15, the lock operation tool 45 of the lock mechanism 40 is arranged in the direction along the grip 46 b of the operation tool 46 in a side view, whereby the operator When the operator grips the grip 46b of the operation tool 46, all or part of the finger other than the operator's thumb is inevitably configured to easily enter the loop-shaped opening of the lock operation tool 45. Yes.

  Thereby, substantially simultaneously with gripping the grip portion 46b of the operation tool 46, a finger is inserted into the opening of the lock operation tool 45, the lock operation tool 45 is operated inward, and the lock mechanism 40 is operated in the unlocked state. Thus, the operation tool 46 and the lock operation tool 45 can be operated with one hand. As a result, the operability of the operation tool 46 and the lock operation tool 45 can be improved.

  In the overlapping state of the spare seedling placement part F, the lock mechanism 40 and the grip part 46b of the operation tool 46 are arranged in the front and rear center part of the second frame member 50 (front and rear center part inside the upper stage seedling placement base 20u). Therefore, the state of the preliminary seedling placement portion F can be switched by operating the lock mechanism 40 and the operation tool 46 from the driver seat 12 side (rear side), and from the heel or the like (front side) of the front of the machine body The state of the preliminary seedling placement portion F can be switched by operating the lock mechanism 40 and the operation tool 46. Thereby, the lock mechanism 40 and the operation tool 46 can be disposed at appropriate positions that are easy to operate from the front side and the rear side, and the workability of the state switching work of the preliminary seedling placement unit F can be improved.

  In this case, the operator sitting on the driver's seat 12 stands up from the driver's seat 12 and extends the right hand or the left hand to the front and easily reaches the position where the operator can reach easily. An operation tool 46 is provided. Thereby, the state of the preliminary seedling placement unit F can be switched easily and quickly, and the workability of the state switching operation of the preliminary seedling placement unit F can be improved. In addition, in a small riding rice transplanter, for example, while standing on the driver's seat 12, the operator holds the operation tool 46 of the spare seedling placement unit F in an overlapping state, and stands on the driver's seat 12 while standing up from the driver's seat 12. The placement unit F may be configured to be switched to the deployed state. For example, the preliminary seedling stage F may be configured to be switched to the deployed state while being seated on the driver seat 12.

  As described above, in the case where the configuration in which the operation tool 46 is equipped at different positions or different parts is adopted, the configuration in which the lock mechanism 40 is equipped at different positions or different parts in accordance with the position change of the operation tool 46 is adopted. It may be adopted.

  As shown in FIG. 5, the upper preliminary seedling table 20 u is configured to include a second frame member 50 and a seedling receiver 31 u connected to the second frame member 50. A U-shaped front and rear brackets 32 and 33 having a longitudinal sectional shape opened downward in a side view are fixed to the upper surface side of the front and rear portions of the second frame member 50. The front and rear brackets 32 and 33 have the same structure as the front and rear brackets 32 and 33 fixed to the first frame member 30.

  As shown in FIG. 9, the seedling receiver 31u is made of resin and is configured to have the same external shape as the middle seedling receiver 31m. Left and right side wall portions 31a protruding upward from the surface 31A are formed. The front part and the rear part of the seedling receiver 31u are opened in the front-rear direction, and no walls are provided at the front part and the rear part of the seedling receiver 31u.

  An opening 31b is formed in the left and right central portion of the front portion of the seedling receiver 31u and is recessed in the rear side in a plan view and opened upward and downward. An opening 31c is formed which is recessed in the front side in plan view and is open at the top and bottom. As a result, when the preliminary seedling placement portion F is in the unfolded state, a horizontally long rectangular hand that is long in the left and right in plan view, in cooperation with the rear opening 31c and the opening 31b of the front and rear seedling receiver 31m. The insertion hole H can be formed.

  Even if the seedling G is not moved to the front side by the opening 31b of the front seedling receiving body 31u when the preliminary seedling placing part F is in the unfolded state, the seedling G remains in the state of being placed on the seedling receiving body 31u. The seedling G can be easily pulled up and taken out, and the workability of taking out the seedling G from the preliminary seedling placement portion F in the expanded state can be improved.

  As shown in FIGS. 5 and 7, a frame-shaped frame 34 having the same structure as that of the middle stage seedling mounting base 20 m is fastened and fixed to the lower part of the seedling receiver 31 u from below. The front and rear connecting brackets 35 are fixed to the inner end. Thereby, the seedling receiver 31u is supported by the frame-like frame 34 fixed to the front and rear connecting brackets 35.

  The front and rear connection brackets 35 are connected to each other so as to be rotatable around the left and right axial centers b of the front and rear brackets 32 and 33, respectively. As a result, the seedling receiver 31u and the frame-shaped frame 34 are supported on the second frame member 50 side so as to be swingable around the axis b in the left-right direction.

  The front and rear connecting brackets 35, and the front and rear brackets 32, 33 are configured in the same structure as the middle stage seedling placing table 20m, and the upper stage seedling placing table 20m is the same as the middle stage seedling placing table 20m. The stand 20u can be changed to a standing posture that swings upward and stands up and a use posture that falls down, and can be held in these postures.

  As shown in FIG. 13 (a), a central boss portion 50 a in which a left and right through hole is formed is formed at the front and rear central portion of the second frame member 50, and the rear end of the second frame member 50. The part is formed with a rear boss part 50b in which left and right through holes are formed.

  As shown in FIG. 5, the lower preliminary seedling stage 20 d includes a third frame member 51 and a seedling receiver 31 d connected to the third frame member 51. A U-shaped front and rear brackets 32 and 33 having a longitudinal sectional shape opened downward in a side view are fixed to the upper surfaces of the front and rear portions of the third frame member 51. The front and rear brackets 32 and 33 have the same structure as the front and rear brackets 32 and 33 fixed to the first and second frame members 30 and 50.

  As shown in FIG. 9, the seedling receiver 31d is made of resin and has the same external shape as the upper and middle seedling receivers 31u and 31m, and the seedlings G are placed on the left and right sides thereof. Left and right side wall portions 31a protruding upward from the seedling placement surface 31A to be formed are formed. The front part and the rear part of the seedling receiver 31d are open in the front-rear direction, and no walls are provided at the front part and the rear part of the seedling receiver 31d.

  An opening 31b is formed in the left and right central portion of the front portion of the seedling receiving body 31d so as to be recessed rearward in a plan view and open upward and downward. An opening 31c is formed which is recessed in the front side in plan view and is open at the top and bottom. Thereby, when the preliminary seedling placement part F is in the unfolded state, a horizontally long rectangular hand is inserted in the plan view in the left and right directions in cooperation with the opening 31b on the front side and the opening 31c of the seedling receiver 31m at the front and rear center. A hole H can be formed.

  Even if the seedling G is not moved rearward by the rear opening 31b when the preliminary seedling placement portion F is in the unfolded state, the seedling G remains in the state where it is placed on the seedling receiver 31d. Can be easily pulled up and taken out, and the workability of taking out the seedling G from the preliminary seedling placement portion F in the unfolded state can be improved.

  As shown in FIGS. 5 and 7, a frame-like frame 34 having the same structure as the upper and middle preliminary seedling platforms 20u and 20m is fastened and fixed to the lower part of the seedling receiver 31d from below. Front and rear connecting brackets 35 are fixed to the inner end of the frame 34. As a result, the seedling receiver 31 and the frame-shaped frame 34 are supported on the third frame member 51 side so as to be swingable around the left-right axis c.

  The front and rear connection brackets 35 are connected to each other so as to be rotatable around the left and right axial centers c of the front and rear brackets 32 and 33, respectively. Thereby, the seedling receiver 31d and the frame-shaped frame 34 are supported on the third frame member 51 side so as to be swingable around the axis c in the left-right direction.

  The front and rear connecting brackets 35 and the front and rear brackets 32, 33 are configured in the same structure as the upper and middle preliminary seedling platforms 20u, 20m, and the upper and middle preliminary seedling platforms 20u, 20m Similarly, the lower stage seedling stage 20d is configured to be able to change the posture between an upright posture that swings upward and stands up, and a use posture that falls down, and can be held in these postures.

  As shown in FIG. 13 (c), a central boss portion 51 a in which a left and right through hole is formed is formed in the front and rear central portion of the third frame member 51, and the front end portion of the third frame member 51. Is formed with a front boss portion 51b in which left and right through holes are formed.

  As shown in FIGS. 5 to 7, the first, second, and third frame members 30, 50, 51 are interlocked and connected via a parallel link type link mechanism 60. The link mechanism 60 includes a first linkage link 61 provided across the first, second, and third frame members 30, 50, 51 and a first link provided across the first and second frame members 30, 50. The second linkage link 62 and the third linkage link 63 provided across the first and third frame members 30 and 51 are configured.

  As shown in FIGS. 5 and 13, the first linkage link 61 is formed of a round pipe material, and a central boss portion 61 </ b> A in which a laterally-facing linkage hole is formed in the front and rear central portion thereof is formed. A left and right first support shaft 61B is fixed to the front end, and a left and right second support shaft 61C is fixed to the rear end.

  The second linkage link 62 is made of a round pipe material, and has a first boss portion 62A formed with a left and right linkage hole at one end thereof, and a left and right linkage hole formed at the other end. A second boss portion 62B is formed. The third linkage link 63 is formed of a round pipe material. A boss portion 63A having a left and right linkage hole is formed at one end thereof, and a left and right support shaft 63B is fixed to the other end portion. Yes.

  As shown in FIG. 13B, the central boss 61 </ b> A of the first linkage link 61 is rotatably fitted on the central support shaft 23 supported by the upper end of the support frame 19. Thereby, the front-rear center part of the first linkage link 61 is supported so as to be rotatable around the center axis P <b> 1 in the left-right direction of the center support shaft 23.

  As shown in FIG. 13 (c), the first support shaft 61B of the first linkage link 61 has a left and right axis P3 around the front boss portion 51b of the third frame member 51 of the lower preliminary seedling mount 20d. It is linked in a freely rotatable manner. As shown in FIG. 13 (a), the second support shaft 61C of the first linkage link 61 is arranged around the axial center P2 in the left-right direction on the rear boss portion 50b of the second frame member 50 in the upper preliminary seedling mount 20u. It is linked so that it can rotate freely.

  As shown in FIG. 13 (b), the boss portion 62A of the second linkage link 62 is arranged on the left and right sides of the front boss portion 30b of the first frame member 30 in the intermediate preliminary seedling platform 20m via the front support shaft 64. It is linked so as to be rotatable around the axial center P4. As shown in FIG. 13 (a), the second boss portion 62B of the second linkage link 62 is directed left and right via the support shaft 65 to the central boss portion 50a of the second frame member 50 in the upper stage seedling mounting base 20u. Are linked so as to be rotatable around the axis P5.

  As shown in FIG. 13 (c), the boss portion 63A of the third linkage link 63 is laterally directed to the central boss portion 51a of the third frame member 51 of the lower preliminary seedling stage 20d via a support shaft 66. It is linked so as to be rotatable around the axis P7. As shown in FIG. 13 (b), the support shaft 63B of the third linkage link 63 rotates about the left-right axis P6 around the rear boss 30c of the first frame member 30 in the intermediate stage seedling mounting base 20m. It is linked freely.

  As shown in FIGS. 5 and 8, at the end of the second linkage link 62 on the second boss portion 62B side, the front and rear central portions (preliminary seedlings) of the second linkage link 62 when the spare seedling placement portion F is unfolded. The second support member 38 is fixed to the upper part of the second linkage link 62 in a state where the placement portion F is overlapped.

  As shown in FIGS. 16 and 17, the second support member 38 is formed in a U-shape with the longitudinal section in the front view opened upward, and the inner plate at the lower end thereof is the second linkage link 62. It is fixed to the side. As a result, the second frame member 50 of the upper preliminary seedling table 20u is inserted from above between the outer plate and the inner plate formed on the second support member 38 in the deployed state of the preliminary seedling placement unit F. Thus, the upper stage seedling stage 20 u is supported by the second linkage link 62 via the second support member 38.

  An outer inclined portion 38A that is inclined obliquely upward is formed at the upper end of the outer plate of the second support member 38, and is inclined obliquely inwardly upward at the upper portion of the inner plate of the second support member 38. An inner inclined portion 38B is formed.

  In the case where the preliminary seedling placement portion F is switched from the overlapped state to the expanded state, the tip of the lock pin 43 of the lock mechanism 40 contacts the outer inclined portion 38A formed on the outer plate of the second support member 38, It automatically moves inward against the biasing force of the elastic spring 44. As a result, when the spare seedling placement unit F is switched from the overlapped state to the deployed state, the preliminary seedling placement unit F is deployed from the overlapped state without pulling the lock operation tool 45 of the lock mechanism 40 described later inside. It is possible to switch to a state, and it is possible to easily switch the state of the preliminary seedling placement unit F.

  When switching the preliminary seedling placement portion F from the overlapping state to the unfolded state, the second frame member 50 of the upper preliminary seedling placement base 20u is guided by the inner inclined portion 38B formed on the inner plate of the second support member 38. While being done, it enters between the outer plate and the inner plate of the second support member 38. Thereby, the position of the upper preliminary seedling stage 20u can be changed without difficulty, and rattling of the upper preliminary seedling stage 20u in the left-right direction can be effectively prevented when the preliminary seedling stage F is deployed.

  A support hole portion 38C for supporting the support pin 42 of the lock mechanism 40 is formed in the front portion of the outer plate of the second support member 38. The shape of the support hole portion 38C is such that the preliminary seedling stage 20 is unfolded. In the case of switching to the overlapping state, the support pin 42 is formed in a shape along the relative trajectory of the rotation, and the axis of the support pin 42 enters the support hole 38C in a state where the support pin 42 is inserted. It is formed in such a shape.

  A lock hole 38D into which the lock pin 43 of the lock mechanism 40 enters is formed at the rear portion of the outer plate of the second support member 38, and the tip of the lock pin 43 of the lock mechanism 40 enters into the lock hole 38D. The state where the second frame member 50 enters between the outer plate and the inner plate of the second support member 38 can be maintained.

  Thus, the lock mechanism 40 can function as a locking device that locks the preliminary seedling stage 20 in an overlapped state in cooperation with the first support member 37, and in cooperation with the second support member 38. The preliminary seedling placement part F can be made to function as a locking tool that locks the preliminary seedling placement part F in the deployed state. Simplification can be achieved.

  In the overlapping state and the unfolded state of the preliminary seedling placement portion F, the support pin 42 is engaged with the support holes 37C and 38C and the second frame member 50 is supported by the first or second support members 37 and 38. Therefore, the second frame member 50 can be supported by the first or second support member 37, 38 with a dedicated support pin 42, which is different from the lock pin 43 of the lock mechanism 40. Thereby, for example, it is possible to prevent an excessive load from the second frame member 50 from acting on the lock pin 43 to make it difficult for the lock pin 43 to come out, and to lock the lock holes 37D of the first or second support members 37, 38. Since the lock pin 43 of the lock mechanism 40 can be easily inserted and removed from 38D, the lock operation tool 45 of the lock pin 43 can be operated with a relatively small operation force.

  Further, it is possible to prevent the lock holes 37D and 38D of the first or second support members 37 and 38 and the lock pin 43 of the lock mechanism 40 from being damaged due to wear or the like. As a result, the second frame member 50 can be stably supported by the first or second support members 37 and 38, and the overlapping state and the unfolded state of the preliminary seedling placement portion F are securely locked by the lock mechanism 40. can do.

  The locking mechanism 40 can be positioned in the vicinity of the first or second support members 37 and 38 that support the second frame member 50 in the overlapping state and the deployed state of the preliminary seedling placement portion F. Thereby, for example, at the time of assembling the preliminary seedling placement portion F, the position of the lock pin 43 of the lock mechanism 40 and the lock holes 37D and 38D of the first or second support members 37 and 38 can be easily aligned. The workability of the assembly work of the preliminary seedling placement portion F can be improved, and the position of the lock holes 37D and 38D and the position of the lock pin 43 can be changed by the bending of the second frame member 50 by placing the seedling G. Misalignment can be prevented.

[Detailed structure of seedling stopper]
The detailed structure of the seedling stopper provided in the preliminary seedling placement unit F will be described with reference to FIGS. 5 to 7, 9, and 18. FIG. 18 is a perspective view showing the structure of the front and rear movable stoppers 70 and 80. As shown in FIGS. 5 to 7, the seedling stopper includes a fixed front fixing stopper 68 provided at the front end of the preliminary seedling table 20 u and a fixing provided at the rear end of the preliminary seedling table 20 d. A rear fixed stopper 69 of the type, a movable front movable stopper 70 disposed across the front part of the preliminary seedling stage 20m and the front part of the preliminary seedling stage 20d, and the rear part of the preliminary seedling stage 20u A movable rear movable stopper 80 disposed over the rear seedling stand 20m is provided.

  As shown in FIGS. 5 and 9, a front fixing stopper 68 is fastened and fixed to the front portion of the seedling receiver 31u from the lower surface side, and the front fixing stopper 68 has a longitudinal sectional shape in a side view. Is formed in an angle shape.

  The height of the upper end of the receiving portion 68a in the front fixing stopper 68 is higher than the seedling placement surface 31A of the seedling receiving body 31u and lower than the upper end of the tray of the seedling G placed on the seedling receiving body 31u. (Refer to FIG. 7), the width in the left-right direction of the front fixing stopper 68 is set to a length that can partially receive and support the inner part of the seedling G placed on the seedling receiver 31u. Yes. Thereby, it is possible to effectively prevent the seedling G from dropping off from the front portion of the upper preliminary seedling stage 20u in the overlapped state and the deployed state by the front fixing stopper 68.

  A rear portion fixing stopper 69 is fastened and fixed to the rear portion of the seedling receiving body 31d from the lower surface side of the inner portion thereof. The rear portion fixing stopper 69 is formed in an angle shape in a vertical cross section when viewed from the side.

  The height of the upper end of the receiving portion 69a in the rear fixed stopper 69 is higher than the seedling placement surface 31A of the seedling receiving body 31d and lower than the upper end of the tray of the seedling G placed on the seedling receiving body 31d. The width in the left-right direction of the rear fixing stopper 69 is set to a length that can partially receive and support the inner part of the seedling G placed on the seedling receiver 31d. Thereby, the rear fixed stopper 69 can effectively prevent the seedling G from dropping out from the rear part of the lower preliminary seedling mounting base 20d when the preliminary seedling mounting part F is overlapped and deployed.

  By constituting the front and rear fixed stoppers 68 and 69 as described above, the front end portion of the seedling receiver 31u and the rear end portion of the seedling receiver 31d are effectively reinforced by the front and rear movable stoppers 68 and 69. Therefore, the downward bending of the seedling receivers 31u and 31d with the seedling G placed thereon can be reduced. As a result, the seedling G can be stably supported on the preliminary seedling platforms 20u and 20d, and the seedling receivers 31u and 30d formed of resin can be prevented from being damaged.

  In this embodiment, the front and rear fixing stoppers 68 and 69 are formed of parts different from the seedling receivers 31u and 31d, and the parts of the seedling receivers 31u and 31d and the seedling receiver 31m are shared. However, a configuration in which the front and rear fixing stoppers 68 and 69 are integrally formed with the seedling receivers 31u and 31d with a resin may be employed.

  As shown in FIG. 5 to FIG. 7 and FIG. 18, the front part of the first frame member 30 of the intermediate stage seedling stand 20 m is a U-shaped front part whose longitudinal sectional shape is opened forward in a side view. A bracket 53 is fixed. The front bracket 53 is formed with a vertical through hole, and the front movable stopper 70 is supported in the through hole so as to be swingable around the vertical axis d.

  The front movable stopper 70 includes a movable stopper main body 71 and a plate-like member 72. The movable stopper main body 71 of the front movable stopper 70 is formed by bending a round bar, so that an upper receiving portion 71A for receiving and supporting the seedling G placed on the intermediate seedling placing stand 20m is formed on the upper portion thereof. In the lower part, a lower receiving part 71B for receiving and supporting the seedling G placed on the lower preliminary seedling mounting base 20d is formed, and the outer shape in front view in the action posture described later is opened outward. Shaped in a letter shape.

  A flat plate-like plate member 72 is fixed to the end of the upper receiving portion 71A, and the vertically supporting shaft portion of the movable stopper main body 71 is inserted into the vertically extending through hole of the front bracket 53 from below. With the inner fitting inserted, the plate-like member 72 is fitted and fixed from above to the upper end of the support shaft portion of the upper receiving portion 71A. As a result, the front movable stopper 70 can be supported by the front bracket 53 so as to be rotatable around the vertical axis d.

  Thereby, the front movable stopper 70 swings outward around the vertical axis d and receives and supports the seedlings G placed on the intermediate and lower preliminary seedling platforms 20m, 20d (movement of the seedling G). And a non-acting posture that swings inwardly around the vertical axis d and is in a state along the front-rear direction and cannot receive and support the seedling G (allows movement of the seedling G). The posture can be changed.

  As shown in FIG. 7, in the action posture of the front movable stopper 70, the front portion is formed so that an open portion 70 </ b> A with the front and rear opened is formed between the upper receiving portion 71 </ b> A and the lower receiving portion 71 </ b> B. Since the movable stopper 70 is formed in a U-shape, the seedling G is replenished from the front to the lower preliminary seedling stage 20d through the opening 70A while the front movable stopper 70 is in the acting posture. Can do.

  This makes it difficult for the front movable stopper 70 to obstruct the supply of the seedling G from the front to the lower stage seedling stage 20d, and the front movable stopper 70 places it on the middle and lower stage preliminary seedling stages 20m and 20d. While preventing the placed seedling G from falling forward, the seedling G can be replenished from the front without difficulty on the lower preliminary seedling stage 20d.

  As shown in FIGS. 5 and 18, a front arm member 71a is fixed to the upper portion of the support portion of the movable stopper body 71, and a front end portion of an interlocking rod 85 described later is attached to the front arm member 71a. It is linked.

  As shown in FIGS. 5 to 7 and FIG. 18, a U-shaped rear bracket 54 having a longitudinal sectional shape opened rearward in a side view is formed at the rear portion of the first frame member 30 of the intermediate preliminary seedling stage 20 m. Is fixed. The rear bracket 54 is formed with a vertical through hole, and a rear movable stopper 80 is supported in the through hole so as to be swingable around a vertical axis e.

  The rear movable stopper 80 includes a movable stopper main body 81, a plate-like member 82, a positioning pin 83, and an elastic spring 84. The movable stopper main body 81 of the rear movable stopper 80 is formed by bending a round bar, and an upper receiving portion 81A for receiving and supporting the seedling G placed on the upper preliminary seedling placing base 20u is formed on the upper portion thereof, A lower receiving portion 81B for receiving and supporting the seedling G placed on the middle stage preliminary seedling placing stand 20m is formed at the lower portion thereof, and the outer shape in front view in the action posture described later is opened outward. It is shaped into a shape.

  The vertically supporting shaft portion of the movable stopper body 81 is inserted into the vertically extending through hole of the rear bracket 54. In this state, the lower end of the supporting shaft portion of the movable stopper body 81 and the end of the lower receiving portion 81B are inserted. The plate-like member 82 is fixed over the part. As a result, the rear movable stopper 80 can be supported by the rear bracket 54 so as to be rotatable around the vertical axis e.

  Thereby, the rear movable stopper 80 swings outward around the vertical axis e and can receive and support the seedlings G placed on the upper and middle preliminary seedling platforms 20u and 20m, The posture is changeable to a non-working posture that swings inwardly around a downward axis e and is in a state along the front-rear direction.

  A vertical positioning pin 83 is fixed to the plate-like member 82. The lower portion of the rear bracket 54 is formed with first and second positioning holes 54a and 54b into which the upper end of the positioning pin 83 enters from the lower side, and the first and second positioning holes 54a and 54b are shafts facing upward and downward. It is formed on the same circumference around the center e. An elastic spring 84 is provided over the movable stopper main body 81 and the upper surface side of the rear bracket 54, and the rear movable stopper 80 is moved upward by the elastic spring 84 (the positioning pin 83 has the first or second positioning holes 54 a and 54 b. It is energized by the side that enters.

  As a result, the rear movable stopper 80 is pushed downward against the biasing force of the elastic spring 84 and the positioning pin 83 comes out of the first or second positioning holes 54a, 54b. Oscillation around the axis e is allowed. Then, by engaging the positioning pin 53 into the first or second positioning holes 54a and 54b by the biasing force of the elastic spring 84, the rear movable stopper 80 cannot swing around the vertical axis e. .

  As shown in FIG. 7, in the action posture of the rear movable stopper 80, the rear movable stopper is formed between the upper receiving portion 81A and the lower receiving portion 81B so as to form an open portion 80A open front and rear. Since the shape of 80 is formed in a U-shape, the seedling G can be taken out from the preliminary seedling placing stand 20m in the middle stage through the opening 80A with the rear movable stopper 80 in the acting posture.

  This makes it difficult for the rear movable stopper 80 to prevent the rear seedling G from being taken out from the middle stage preliminary seedling platform 20m, and the seedlings placed on the upper and middle preliminary seedling platforms 20u and 20m by the rear movable stopper 80. While preventing G from falling backward, the seedling G can be taken out rearwardly from the middle stage seedling stage 20m.

  As shown in FIGS. 5 and 18, the rear end (one end) of the interlocking rod 85 is linked to the lower end of the positioning pin 83 of the rear movable stopper 80, and the front end (others) of the interlocking rod 85 is connected. A front arm member 71a fixed to the front movable stopper 70 is linked to the end portion. As a result, the front and rear movable stoppers 70 and 80 are mechanically linked, and an interlocking mechanism that interlocks and connects the front and rear movable stoppers 70 and 80 is configured.

  The rear movable stopper 80 is swung in a state where the rear movable stopper 80 is pushed downwards against the urging force of the elastic spring 84 to allow the rear movable stopper 80 to swing about the vertical axis e. As a result, the operation of the rear movable stopper 80 is transmitted to the front movable stopper 70 via the interlocking rod 85, and the front movable stopper 70 swings in conjunction with the rear movable stopper 80.

  When the position of the positioning pin 83 is positioned at the position of the first positioning hole 54a, and the positioning pin 83 is engaged with the first positioning hole 54a by the biasing force of the elastic spring 84, the rear movable stopper 80 is rotated around the vertical axis e. The rear movable stopper 80 is held in a state in which the posture is changed to the action posture. In this case, the interlocking rod 85 makes it impossible for the front movable stopper 70 to swing about the vertical axis d, so that the front movable stopper 70 is also held in a state in which the posture has been changed to the action posture.

  On the other hand, when the position of the positioning pin 83 is positioned at the position of the second positioning hole 54b and the positioning pin 83 is engaged with the second positioning hole 54b by the biasing force of the elastic spring, the vertical axis e of the rear movable stopper 80 is set. Swinging around becomes impossible, and the rear movable stopper 80 is held in a state in which the posture is changed to the non-operation posture. In this case, the interlocking rod 85 makes it impossible for the front movable stopper 70 to swing about the vertical axis d, so that the front movable stopper 70 is also held in a non-acting posture.

  In this way, the front movable stopper 70 is configured so that the posture is changed in conjunction with the change in the posture of the rear movable stopper 80, so that the front seedling placement unit F can be moved forward from the rear side (driver seat 12 side). The posture of the front and rear movable stoppers 70 and 80 can be changed quickly and easily.

  Although not shown, the rear movable stopper 80 is interlocked with the posture change of the front movable stopper 70 by adopting, for example, front and rear movable stoppers (not shown) symmetrical to this embodiment. May be configured such that the posture is changed. Thereby, the posture of the front and rear movable stoppers 70 and 80 can be easily and quickly changed from the front side of the preliminary seedling placement portion F.

  Although not shown, for example, the front movable stopper 70 is configured to change its posture in conjunction with the posture change of the rear movable stopper 80, and the rear portion is linked to the posture change of the front movable stopper 70. The movable stopper 80 may be configured to change its posture. Accordingly, the posture of the front and rear movable stoppers 70 and 80 can be easily and quickly changed from both the front side and the rear side of the preliminary seedling placement unit F according to the work mode.

[Status switching status of spare seedling placement section]
The state switching state of the preliminary seedling placement unit F will be described with reference to FIGS. 5, 7, 8, 10, and 19. FIG. 19 is a longitudinal side view of the preliminary seedling placement unit F in the unfolded state. As shown in FIGS. 5 and 8, with the front and rear movable stoppers 70, 80 changed to the non-operating posture, the lock mechanism 40 is grasped by grasping the operating tool 46 from the overlapping state of the preliminary seedling placement portion F. When the unlocking state is operated and the operation tool 46 is pushed or pulled slightly upward and forward, the first linkage link 61 swings around the left-right axis P1, and the second linkage link 62 becomes the left-right axis. It swings around P4, and the third linkage link 63 swings around the left-right axis P6.

  Then, the left and right axial center P2 of the rear portion of the upper preliminary seedling table 20u moves forward and downward along the rotation locus L1 around the horizontal axis P1, and before and after the upper preliminary seedling table 20u. The center axis P5 moves forward and downward along the rotation locus L2 around the left-right axis P4. Thereby, the upper stage seedling stage 20u moves to the front side of the middle stage seedling stage 20m in a state where the height difference between the front end and the rear end of the upper stage seedling stage 20u is not substantially changed.

  Further, the left and right axial center P3 of the front part of the lower preliminary seedling stage 20d moves rearward and upward along the rotation locus L3 around the horizontal axis P1, and the lower preliminary seedling stage 20d The axial center P7 in the front-rear central portion moves rearward and upward along the rotation locus L4 around the left-right axis P6. Thereby, the lower stage seedling stage 20d moves to the rear side of the middle stage seedling stage 20m in a state where the height difference between the front end and the rear end of the lower stage seedling stage 20d is not substantially changed.

  Then, the second frame member 50 of the upper stage seedling mount 20u is supported by the second support member 38 fixed to the second linkage link 62, and the first, second and third linkage links 61, 62, 63 swing range is regulated. As a result, the upper and lower standby seedling platforms 20u and 20d are substantially aligned with the middle preliminary seedling platform 20m, and the preliminary seedling placement unit F is switched to the unfolded state. In this case, the lock mechanism 40 is automatically operated to the locked state, and the deployed state of the preliminary seedling placement unit F is automatically maintained.

  As a result, when the operation tool 46 is operated forward, one movement of the link mechanism 60 allows the upper and lower standby seedling platforms 20u and 20d to be moved simultaneously via the link mechanism 60. The mounting portion F can be switched from the overlapped state to the expanded state. As a result, the state switching of the spare seedling placement unit F can be performed simply and quickly, and the workability of the state switching operation of the preliminary seedling placement unit F can be improved.

  By switching the preliminary seedling placement part F to the unfolded state, the seedling G is placed on the front part of the preliminary seedling placing base 20u on the front side and the seedling G is pushed slightly rearward by bringing the front part of the machine body closer to the heel etc. The seedling G can be slid and moved rearward on the preliminary seedling platforms 20u, 20m, and 20d, and the seedling G can be moved to the rear of the preliminary seedling placement unit F. The seedling G that has moved to the rear part of the preliminary seedling placement part F is received and supported by the rear fixing stopper 69 provided at the rear part of the rear preliminary seedling stage 20d, and is prevented from falling backward. Thereby, the replenishment of the seedling G from the cocoon or the like at the front of the body to the seedling platform 10 at the rear of the body can be performed efficiently.

  In this case, since the front and rear movable stoppers 70 and 80 are changed to the non-acting postures, the front and rear central seedling mounting bases 20u and the front and rear central preliminary seedling mounting bases 20m and the front and rear central standby stoppers are arranged. There is no seedling stopper between the seedling placing stand 20m and the rear spare seedling placing stand 20d, and the seedling G can be moved rearward without difficulty.

  In addition, when the three seedlings G are placed side by side on the preliminary seedling placement unit F in the unfolded state, the front fixing stopper 68 provided in the front part of the front preliminary seedling stage 20u and the rear spare part are arranged. The seedlings G placed on the preliminary seedling placement part F are received and supported by the rear fixing stopper 69 provided at the rear part of the seedling placing stand 20d, and are prevented from falling off in the front-rear direction.

  When the operation tool 46 is grasped from the deployed state of the preliminary seedling placement portion F to operate the lock mechanism 40 to the unlocked state, and the operation tool 46 is pushed or pulled slightly upward and backward, the first linkage link 61 is directed left and right. The second linkage link 62 is swung about the left-right axis P4, and the third link 63 is swung about the left-right axis P6.

  Then, the left and right axial center P2 of the rear part of the front spare seedling platform 20u moves rearward and upward along the rotation locus L1 around the left and right axial center P1, and before and after the front preliminary seedling platform 20u. The center axis P5 moves rearward and upward along the rotation locus L2 around the left-right axis P4. Thereby, the front side preliminary seedling stage 20u moves to the upper side of the front and rear central preliminary seedling stage 20m in a state where the height difference between the front end and the rear end of the front side preliminary seedling stage 20u is not substantially changed.

  Further, the left and right axial center P3 of the front portion of the rear spare seedling table 20d moves forward and downward along the rotation locus L3 around the left and right axial center P1, and the rear preliminary seedling table is provided. The axis P7 at the front and rear center part of 20d moves forward and downward along the rotation locus L4 around the axis P6 in the left-right direction. As a result, the rear side seedling stage 20d moves to the lower side of the front and rear center preliminary seedling stage 20m in a state where the height difference between the front end and the rear end of the rear side seedling stage 20d is not changed. To do.

  Then, the second frame member 50 of the front spare seedling platform 20u is supported by the first support member 37 fixed to the vertical frame 30d, and the first, second and third linkage links 61, 62, 63 The swing range is restricted. As a result, the upper and lower standby seedling platforms 20u and 20d overlap with the intermediate preliminary seedling platform 20m in a plan view, and the preliminary seedling placement unit F is switched to the overlapping state. In this case, the lock mechanism 40 is automatically operated to the locked state, and the overlapping state of the spare seedling placement unit F is automatically maintained.

  As a result, when the operation tool 46 is operated rearward, the upper and lower standby seedling platforms 20u and 20d can be moved simultaneously via the link mechanism 60 by one movement of the link mechanism 60. The mounting portion F can be switched from the unfolded state to the overlapping state. As a result, the state switching of the spare seedling placement unit F can be performed simply and quickly, and the workability of the state switching operation of the preliminary seedling placement unit F can be improved.

  By switching the preliminary seedling placement part F to the overlapped state and changing the posture of the front and rear movable stoppers 70 and 80 to the working posture, the seedling G placed on the preliminary seedling placement part F becomes the front part and the rear part. The seedlings G are received and supported by the movable stoppers 70 and 80, and the seedling G is fed from the rear part of the upper preliminary seedling stage 20u, the front and rear parts of the middle preliminary seedling stage 20m, and the front part of the lower preliminary seedling stage 20d. It is prevented from falling off in the front-rear direction. In this case, the front part of the upper stage seedling stage 20u and the rear part of the lower stage seedling stage 20d are supported by the front and rear fixing stoppers 68 and 69 so that the seedling G is received and supported. Falling out is prevented.

  As shown in FIGS. 8 and 19, the preliminary seedling stage 20u moves substantially in parallel along the rotation trajectories L1 and L2 without substantially changing the height difference between the front end portion and the rear end part of the preliminary seedling stage 20u. . Thereby, when switching the state of the preliminary seedling placement unit F, the lower end of the rear end of the seedling receiving body 31u in the preliminary seedling stage 20u moves as shown by the rotation locus L5 in FIG. The lower part is less likely to interfere with the front upper part of the seedling G placed on the preliminary seedling stage 20m.

  Similarly, the preliminary seedling stage 20d moves substantially in parallel along the rotation trajectories L3 and L4 without substantially changing the height difference between the front end portion and the rear end part of the preliminary seedling stage 20d. As a result, when the state of the preliminary seedling placement unit F is switched, the upper end of the front end of the seedling G placed on the preliminary seedling placement base 20d moves as indicated by the rotation locus L6 in FIG. 19 and is placed on the preliminary seedling placement base 20d. The placed seedling G is less likely to interfere with the lower rear portion of the spare seedling mount 20m.

  Thereby, even if it does not take out the seedling G from the preliminary seedling placement part F, the state of the preliminary seedling placement part F can be switched while the seedling G is placed on the preliminary seedling placement part F. The workability of the state switching operation of the seedling placement unit F can be improved.

  As shown in FIG. 8, in the case where the spare seedling placement unit F is switched from the overlapped state to the deployed state, the upper preliminary seedling placing base 20u rises to the intermediate state shown by the two-dot chain line in FIG. The seedling mount 20d is lowered to an intermediate state indicated by a two-dot chain line in FIG. Therefore, the lower preliminary seedling stage 20d is lowered by its own weight (including the weight of the seedling G when the seedling G is placed) into the intermediate state, and the upper preliminary seedling stage 20d is linked via the link mechanism 60. It acts as a force that raises the stage 20u (including the seedling G when the seedling G is placed) to an intermediate state and is easily offset, and the moments around the axis P1 acting by these forces are balanced. It becomes easy.

  The upper preliminary seedling stage 20u is lowered from the intermediate state shown by the two-dot chain line in FIG. 8, and the lower preliminary seedling stage 20d is raised from the intermediate state shown by the two-dot chain line in FIG. For this reason, the lower preliminary seedling 20u has a force that the upper preliminary seedling platform 20u descends from the intermediate state by its own weight (including the weight of the seedling G when the seedling G is placed) via the link mechanism 60. It acts as a force that raises the platform 20d (including the seedling G when the seedling G is placed) and is easily offset, and the moment around the axis P1 acting by these forces is easily balanced.

  Further, when the preliminary seedling placement unit F is switched from the expanded state to the overlapped state, the front side preliminary seedling stage 20u rises to an intermediate state indicated by a two-dot chain line in FIG. 8, and the rear side preliminary seedling stage 20d. Falls to an intermediate state indicated by a two-dot chain line in FIG. For this reason, the force that the rear spare seedling platform 20d lowers to its intermediate state by its own weight (including the weight of the seedling G when the seedling G is placed) is applied via the link mechanism 60 to the front spare seedling table 20d. It acts as a force that raises the seedling mount 20u to an intermediate state and is easily offset, and the moment around the axis P1 that acts by these forces is easily balanced.

  The front spare seedling stage 20u is lowered from the intermediate state shown by the two-dot chain line in FIG. 8, and the rear preliminary seedling stage 20d is raised from the intermediate state shown by the two-dot chain line in FIG. Therefore, the force that the front spare seedling table 20u lowers from the intermediate state by its own weight (including the weight of the seedling G when the seedling G is placed) is connected via the link mechanism 60 to the rear side spare seedling base 20u. It acts as a force that raises the seedling placing table 20d (including the seedling G when the seedling G is placed) and is easily offset, and the moment around the axis P1 acting by these forces is easily balanced. .

  In addition, in the intermediate state of the reserve seedling platforms 20u and 20d shown by the two-dot chain line in FIG. 8, the first, second and third linkage links 61, 62 and 63 of the link mechanism 60 are directed upward and downward. The preliminary seedling stage 20u is supported from the lower side by the link mechanism 60, and the lower preliminary seedling stage 20d is supported from the upper side by the link mechanism 60.

  As a result, even if the operating tool 46 is not pushed and pulled with a large operating force, the operating tool 46 can be operated with a small operating force to switch the state of the spare seedling placement unit F. The state can be easily switched. Further, for example, even if the hand is released from the operation tool 46 while the state of the spare seedling placement unit F is being switched, the upper and lower preliminary seedling placement bases 20u after the hand is released from the operation tool 46. , 20d will not rise or fall suddenly. Thereby, damage to the preliminary seedling placement part F can be prevented.

  When the preliminary seedling placement unit F is switched from the overlapping state to the deployed state, the upper preliminary seedling platform 20u is deployed forward and downward, and the lower preliminary seedling platform 20d is deployed rearward and upward. Therefore, the upper stage seedling stage 20u can be moved back and forth at a high position. Accordingly, even when an obstacle such as a cocoon is present in front of the lower portion of the preliminary seedling placement unit F, the preliminary seedling placement unit F can be easily switched from the overlapped state to the expanded state, and The situation in which the state of the mounting portion F is switched can be easily seen by a work assistant such as a bag.

  As shown in FIGS. 8 and 19, the preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 20 u expands forward and downward and the lower preliminary seedling stage 20 d expands rearward and upward. Is located at the front upper side of the second linkage link 62 in the deployed state, and the spare seedling placement portion F is located on the lower side of the front portion of the third linkage link 63 in the deployed state. The rear portion of the link 61 is positioned.

  Thereby, the rear part of the front side seedling stand 20u is positioned higher than the front part of the front and rear center seedling stage 20m with the first and second link links 61, 62 having a simple linear shape. The first and third linkage links 61 and 63 having a simple linear shape can position the front portion of the rear side seedling support table 20d at a position lower than the rear part of the front and rear center seedling support table 20m. be able to. As a result, a level difference h1 between the front side preliminary seedling stage 20u and the front and rear center preliminary seedling stage 20m and a level difference h2 between the front and rear center preliminary seedling stage 20m and the rear side preliminary seedling stage 20d are obtained. It can be formed easily.

  As shown in FIG. 19, in the unfolded state of the preliminary seedling placement unit F, the seedling placement surface 31A at the rear of the front preliminary seedling placement stand 20u and the seedling placement surface 31A at the front of the front and rear central seedling placement stand 20m. A predetermined level difference h1 is formed between the front and rear center seedling placing bases 20m and a rear seedling placing surface 31A on the rear side and the rear seedling placing base 20d front side. The heights of the front and rear spare seedling platforms 20u and 20d with respect to the front and rear central seedling platforms 20m in the deployed state are set so that the step h2 is formed.

  In addition, the seedling placement surface 31A of the front and rear center seedling placing stand 20m is disposed obliquely so as to incline downward and rearward by the first predetermined angle θ1 with respect to a horizontal plane substantially parallel to the rice field. The seedling placing surface 31A of the seedling placing stand 20u is disposed obliquely so as to be inclined downward and rearward by the second predetermined angle θ2 with respect to a horizontal plane substantially parallel to the rice field, and the rear seedling placing stand 20d The seedling placement surface 31A is disposed obliquely so as to be inclined downward and rearward at the third predetermined angle θ3 with respect to a horizontal plane substantially parallel to the rice field.

  The second predetermined angle θ2 is set to be larger than the first predetermined angle θ1. As a result, the seedling G placed on the front portion of the preliminary seedling placing stand 20u on the front side can be moved rearward with a momentum at the second predetermined angle θ2.

  The third predetermined angle θ3 is set to be larger than the first predetermined angle θ1. Accordingly, the seedling G that has moved from the front side preliminary seedling stage 20u to the rear side preliminary seedling stage 20d is prevented from being stopped in the middle of the rear side preliminary seedling stage 20d while preventing the seedling G from stopping in the middle of the rear side preliminary seedling stage 20d. By the angle θ3, it can be moved to the rear part of the rear seedling stand 20d without difficulty.

  As a result, the seedling G placed on the front part of the preliminary seedling stage 20u on the front side from the heel or the like on the front side of the body is slid on the preliminary seedling stage 20u, 20m, 20d, and the rear side seedling stage is placed. It can be moved to the rear of the platform 20d without difficulty.

  As shown in FIG. 7, in the overlapping state of the preliminary seedling placement unit F, the upper preliminary seedling stage 20u is changed from the use position to the standing position, and the middle preliminary seedling stage 20m is changed from the use position to the standing position. By changing the posture, and changing the posture of the lower stage seedling platform 20d from the usage posture to the standing posture, the preliminary seedling platforms 20u, 20m, and 20d in the upper and lower stages with the spare seedling placement unit F overlapped with each other Can be stored compactly inside.

  As shown in FIGS. 3 and 10, in the deployed state of the spare seedling placement unit F, the front side seedling placing stand 20 u is changed from the use posture to the standing posture, and the front and rear center spare seedling stand 20 m is used. The posture is changed from the standing posture to the standing posture, and the rear spare seedling platform 20d is changed from the usage posture to the standing posture, so that the preliminary seedling placement unit F is expanded to the three preliminary seedling loading platforms 20u and 20m. , 20d can be stored compactly inside the fuselage. In this case, it is also possible to change the posture of the preliminary seedling platforms 20u, 20m, and 20d to the standing posture in a different order.

  That is, the preliminary seedling placement part F can be stored compactly inside the machine body in both the overlapping state and the deployed state of the preliminary seedling placement part F. Thus, for example, when the riding type rice transplanter is stored in a warehouse or the like, or when the riding type rice transplanter is loaded on a truck bed (not shown), the spare seedling placement unit F is switched to the overlapped state. By changing the posture of the seedling stand 20 to the standing posture, the overall length of the aircraft and the overall width of the aircraft can be shortened, and the riding type rice transplanter can be stored and loaded in a compact manner. For example, when the riding type rice transplanter is driven on a relatively narrow road such as a narrow path, the position of the preliminary seedling platform 20 is changed to the standing posture while the preliminary seedling placement unit F is in the unfolded state. Thus, it is possible to change the entire width of the machine body simply and quickly, and to drive the riding type rice transplanter on a relatively narrow road such as a narrow road.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the intermediate preliminary seedling platform 20m is fixed to the support frame 19 side, the upper preliminary seedling platform 20u is deployed to the front side, and the lower preliminary seedling platform is placed. Although an example in which the preliminary seedling placement unit F is configured so that the base 20d is deployed on the rear side is shown, the upper preliminary seedling placement is performed with respect to the intermediate preliminary seedling placement base 20m fixed on the support frame 19 side. The preliminary seedling placement unit F may be configured such that the base 20u is deployed on the rear side and the lower preliminary seedling stage 20d is deployed on the front side. In this case, the height of the spare seedling platform 20u developed on the rear side is set lower than the height of the front and rear central seedling platform 20m, and the height of the spare seedling platform 20d deployed on the front side is set to the height of the front and rear central seedlings. You may set higher than the height of the mounting base 20m.

  In the above-mentioned [Best Mode for Carrying Out the Invention], the intermediate preliminary seedling stage 20m is fixed to the support frame 19 side, and the upper preliminary seedling stage 20u is deployed to the front side via the link mechanism 60. However, the example in which the preliminary seedling placement unit F is configured so that the lower preliminary seedling placement base 20d expands to the rear side is shown. You may comprise the preliminary seedling mounting part F so that the preliminary seedling mounting bases 20 other than being fixed to the support frame 19 side and unfixed to the support frame 19 side may be deployed via the link mechanism 60. Hereinafter, an example will be described with reference to FIG. FIG. 20 is a schematic side view of the preliminary seedling placement unit F in this another embodiment.

  As shown in FIG. 20 (a), the lower preliminary seedling platform 20 d is fixed to the support frame 19, and the upper and middle preliminary seedling platforms 20 u and 20 m are connected to the lower preliminary seedling platform via the link mechanism 60. It is linked to 20d. Then, as shown by a two-dot chain line in FIG. 20 (a), the preliminary seedling placement section is arranged such that the upper and middle preliminary seedling placement bases 20u and 20m are deployed forward relative to the lower preliminary seedling placement base 20d. F is configured. In this case, in the preliminary seedling placement portion F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d is set to gradually decrease toward the rear side.

  Although not shown in the drawing, the preliminary seedling placement unit F is arranged so that the upper and middle preliminary seedling mounting bases 20u and 20m are deployed rearward with respect to the lower preliminary seedling mounting base 20d fixed to the support frame 19 side. May be configured. In this case, in the preliminary seedling placement section F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d may be set so as to gradually decrease toward the rear side.

  As shown in FIG. 20 (b), the upper preliminary seedling stage 20 u is fixed to the support frame 19, and the middle and lower preliminary seedling bases 20 m and 20 d are connected to the upper preliminary seedling stage via the link mechanism 60. It is linked to 20u. Then, as shown by the two-dot chain line in FIG. 20 (b), the preliminary seedling placement is such that the middle and lower preliminary seedling placement stands 20m, 20d are deployed rearward with respect to the upper preliminary seedling placement stand 20u. Part F is configured. In this case, in the preliminary seedling placement portion F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d is set to gradually decrease toward the rear side.

  Further, although not shown in the drawing, the preliminary seedling placement unit F is arranged so that the middle and lower preliminary seedling mounting bases 20m and 20d are deployed forward with respect to the upper preliminary seedling mounting base 20u fixed to the support frame 19 side. It may be configured. In this case, in the preliminary seedling placement section F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d may be set so as to gradually decrease toward the rear side.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Alternative Embodiment of the Invention], the preliminary seedling platforms 20u, 20m, and 20d in the upper and lower stages are provided, and the spare in the overlapping state is provided. Although the example which comprised the seedling mounting part F was shown, the preliminary seedling mounting part F in the overlapping state is configured by including a plurality of different stages (two stages, four stages or more) of the spare seedling mounting base 20 Also good. In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Alternative Embodiment], an example in which the middle stage seedling mounting base 20m is fixed to the support frame 19 side is shown. The preliminary seedling placement unit F may be configured to fix the link mechanism 360 to the support frame 19 side. Hereinafter, an example will be described with reference to FIG. FIG. 21 is a schematic side view of the preliminary seedling placement unit F in this another embodiment.

  As shown in FIG. 21 (a), a preliminary seedling placement section F in an overlapped state is configured by including two stages of the upper and lower preliminary seedling platforms 120u and 120d. The lower preliminary seedling stage 120d is fixed to the support frame 19 side, and the upper preliminary seedling stage 120u is connected to the lower preliminary seedling stage 120d and the link mechanism 160 (the front link 161 and the rear link 162). Linked together. The preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 120u is deployed to the front side with respect to the lower preliminary seedling stage 120d fixed to the support frame 19 side. In this case, the height of the preliminary seedling stage 120u developed on the front side is set to be higher than the height of the preliminary seedling stage 120d fixed to the support frame 19 side.

  In addition, although not shown, the preliminary seedling placement unit F is configured so that the upper preliminary seedling stage 120u expands to the rear side with respect to the lower preliminary seedling stage 120d fixed to the support frame 19 side. The upper preliminary seedling stage 120u is fixed to the support frame 19 side, and the lower preliminary seedling stage 120d is arranged on the front side or the rear side with respect to the upper preliminary seedling stage 120u fixed to the support frame 19 side. The preliminary seedling placement unit F may be configured to expand to

  As shown in FIG. 21 (b), the preliminary seedling placement section F in an overlapped state is configured with four stages of the upper and lower preliminary seedling placement bases 220v, 220u, 220m, and 220d. The second preliminary seedling stand 220m from the bottom is fixed to the support frame 19 side, and the other spare seedling bases 220v, 220u, 220d are connected to the second preliminary seedling stand 220m from the bottom and the link mechanism 260 (linkage link). 261, 262, 263, 264). Then, with respect to the preliminary seedling stage 220m fixed to the support frame 19, the preliminary seedling bases 220v and 220u above the preliminary seedling stage 220m are deployed to the front side, and the preliminary seedling stage 220m below the preliminary seedling stage 220m is reserved. The preliminary seedling placement portion F is configured so that the seedling placement stand 220d is deployed on the rear side. In this case, in the preliminary seedling placement unit F in the unfolded state, the heights of the preliminary seedling placement bases 220v, 220u, 220m, and 220d are set to gradually decrease toward the rear side.

  Further, although not shown in the drawing, any one of the four different upper and lower four-stage standby seedling platforms 220v, 220u, 220m, 220d is fixed to the support frame 19 side to fix the preliminary seedling platforms 220v, 220u, 220d. The placement unit F may be configured. In this case, when the second reserve seedling stand 220u from the top is fixed to the support frame 19, the preliminary seedling stand 220v on the upper side of the preliminary seedling stand 220u is deployed to the front side or the rear side, and the preliminary seedling stand is placed. You may comprise so that the preliminary | backup seedling stand 220m, 220d of the lower side of the stand 220u expand | deploys to the back side or the front side. In addition, when the uppermost preliminary seedling stage 220v is fixed to the support frame 19, the preliminary seedling stage 220u, 220m, and 220d other than the preliminary seedling stage 220v are configured to be deployed on the front side or the rear side. Alternatively, when the lowermost preliminary seedling table 220d is fixed to the support frame 19, the preliminary seedling platforms 220v, 220u, and 220m other than the preliminary seedling table 220d are deployed to the front side or the rear side. It may be configured.

  As shown in FIG. 21 (c), the upper and lower two-stage preliminary seedling platforms 320u and 320d are provided, and the preliminary seedling mounting unit F in the overlapping state is configured. 320d are linked and linked via a link mechanism 360 (linkage links 361, 362). The preliminary seedling mounts 320u and 320d are not fixed to the support frame 19 side, and the lower part of the linkage link 361 of the link mechanism 360 is supported on the upper part of the support frame 19 so as to be swingable around a left-right axis. Yes. Then, when the support frame 19 is swung forward, the preliminary seedling placement portion F is configured so that the upper and lower preliminary seedling placement bases 320u and 320d are deployed to the front side.

  In this case, the lower part of the lower preliminary seedling table 320d is in contact with the front and rear stoppers 19a, 19b fixed to the support frame 19, and the preliminary seedling mounting part F is positioned and supported in the expanded state and the overlapping state. Is done. The spare seedling placement portion F is positioned and supported in the deployed state and the overlapped state by bringing a part of the link mechanism 360 (for example, the linkage link 361) into contact with the front and rear stoppers 19a and 19b. May be. In addition, although not shown, a preliminary seedling placement base F is provided with three or more stages of preliminary seedling placement bases, and a link mechanism that interlocks and connects the preliminary seedling placement bases is supported swingably on the support frame 19 side. Thus, you may comprise the preliminary seedling mounting part F.

  In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Different Embodiment of the Invention], the preliminary seedling placing bases 20u and 20m having three stages in the upper and lower stages in a state where the spare seedling placing part F is overlapped. , 20d is fixed to the support frame 19 side, and the preliminary seedling table 20 other than the preliminary seedling table 20 fixed to the support frame 19 side is deployed in a deployed state on the front side or the rear side. As shown, the example in which the spare seedling placement unit F is configured is shown. However, in the overlapping state of the preliminary seedling placement unit F, two spare seedlings among the upper and lower three-stage spare seedling placement stands 20u, 20m, and 20d are shown. The platform 20 is fixed to the support frame 19 side, and one of the preliminary seedling platforms 20 fixed to the support frame 19 side and the preliminary seedling platform 20 not fixed to the support frame 19 side are connected via a link mechanism. Interlocked and fixed to the support frame 19 side. The preliminary seedling placement unit F may be configured such that the preliminary seedling placement base 20 that is not fixed to the support frame 19 side is deployed to the front side or the rear side with respect to the preliminary seedling placement stage 20 that has been developed. .

  Specifically, for example, among the upper and lower three-stage reserve seedling platforms 20u, 20m, and 20d in an overlapped state, the middle and lower reserve seedling platforms 20m and 20d are fixed to the support frame 19 side, and the middle stage reserve seedlings are placed. The platform 20m and the upper preliminary seedling platform 20u are linked and linked by a link mechanism. Then, the preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 20u expands to the front side or the rear side with respect to the middle preliminary seedling stage 20m fixed to the support frame 19 side.

  Further, although not shown in the figure, when a plurality of different stages (four or more) of spare seedling platforms are provided and the spare seedling placement unit F in the overlapping state is configured, similarly, a plurality of spare seedling units in the overlapping state are provided. A plurality of preliminary seedling platforms among the seedling platforms are fixed to the support frame 19 side, and any one of the plurality of preliminary seedling platforms fixed to the support frame 19 side is fixed to the support frame 19 side. The spare seedling platform that is not fixed to the support frame 19 side is on the front side or the rear side with respect to the preliminary seedling platform that is connected to the other support seedling platform by the link mechanism and fixed to the support frame 19 side. You may comprise the preliminary seedling mounting part F so that it may expand | deploy.

  Specifically, for example, the second and lowermost preliminary seedling platforms 220m, 220d from the bottom of the four upper and lower preliminary seedling platforms 220v, 220u, 220m, 220d in the overlapping state are fixed to the support frame 19 side. The second preliminary seedling platform 220m from the bottom and the uppermost and upper preliminary seedling platforms 220v and 220u are linked and linked by a link mechanism. Then, with respect to the second preliminary seedling stage 220m fixed from the bottom of the support frame 19, the preliminary seedling stage is placed so that the uppermost and upper stage preliminary seedling stages 220v and 220u are deployed on the front side or the rear side. Part F is configured.

[Third Another Embodiment of the Invention]
Instead of the front and rear movable stoppers 70 and 80 in [Best Mode for Carrying Out the Invention], different shapes and structures of the front and rear movable stoppers may be adopted. Hereinafter, an example thereof will be described with reference to FIG. FIG. 22 is a side view of the vicinity of the front movable stoppers 170, 270, and 370 in this alternative embodiment. In the following description, the front movable stoppers 170, 270, and 370 are shown as examples, but the rear movable stoppers 180, 280, and 380 can have the same shape and structure.

  As shown in FIG. 22A, the movable stopper main body 171 of the front movable stopper 170 is formed with an intermediate receiving portion 171C in addition to the upper and lower receiving portions 171A and 171B. An open portion 170A is formed on the upper side and the lower side of the intermediate portion receiving portion 171C, and the shape of the front movable stopper 171 is configured in an E shape. Thereby, for example, the front part of the seedling G placed on the upper and lower three-stage preliminary seedling stage can be received and supported by the upper receiving part 171A, the intermediate receiving part 171C, and the lower receiving part 171B.

  As shown in FIG. 22B, the movable stopper main body 271 of the front movable stopper 270 includes a support rod 271a supported so as to be rotatable about the vertical axis of the front bracket 53, and the support rod 271a. The upper and lower receiving portions 271A, 271B are fixed to the upper and lower portions of the vertical plate. Then, receiving surfaces 271D and 271E for receiving the seedling G are formed on the upper and lower receiving portions 271A and 271B, and an open portion 270A is formed between the upper and lower receiving portions 271A and 271B. Accordingly, the seedling G can be stably received on the surface, and the structure of the front movable stopper 170 can be simplified.

  As shown in FIG. 22 (c), the movable stopper main body 371 of the front movable stopper 370 includes a first rod 371a supported so as to be rotatable about the vertical axis of the front bracket 53, and the first rod 371a. And a second rod 371b fixed to the upper portion of the rod 371a. The first and second rods 371a and 371b are formed with upper and lower receiving portions 371A and 371B facing upward, and an open portion 370A is formed between the first and second rods 371a and 371b. . Thereby, the seedling G can be efficiently received in the shape of an upward and downward line, and the structure of the front movable stopper 370 can be simplified.

  In the aforementioned [Best Mode for Carrying Out the Invention], the front movable stopper 70 supports the seedlings G placed on the intermediate and lower preliminary seedling platforms 20m and 20d, and the rear movable stopper 80 supports the upper stage. In addition, although an example in which the seedlings G placed on the lower preliminary seedling platforms 20u and 20d are supported is shown, the front and rear movable stoppers 70 and 80 support different numbers of seedlings G. It may be configured. Specifically, for example, one of the front and rear movable stoppers 70 and 80 supports the seedling G placed on one preliminary seedling stage 20, and the other of the front and rear movable stoppers 70 and 80 has a plurality. You may comprise so that the seedling G mounted in the preliminary seedling mounting stand (for example, 2 steps | paragraphs of upper and lower sides) may be supported.

[Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] and [Third Another Mode for Carrying Out the Invention], the front and rear movable stoppers 70, 170, 270, 370, 80, 180, 280, 380 are provided. In the above example, the front and rear brackets 53 and 54 are supported so as to be rotatable about the vertical axis, but the front and rear movable stoppers are supported by other than the front and rear brackets 53 and 54. You may employ | adopt and may employ | adopt the structure which supports a front part and a rear part movable stopper so that rotation is possible around the axis center of the left-right direction. Hereinafter, an example thereof will be described with reference to FIG. FIG. 23 is a detailed view of the vicinity of the front movable stopper 470 in this another embodiment.

  As shown in FIGS. 23A and 23B, the front movable stopper 470 includes a movable stopper main body 471, a shaft member 472, and a bearing member 473. A shaft member 472 is supported at the front lower portion of the seedling receiver 31 in the preliminary seedling mount 20 so as to be rotatable around a left-right axial center via left and right bearing members 473. A movable stopper main body 471 is fixed.

  As a result, the movable stopper body 471 is supported by the lower front portion of the seedling receiver 31 so as to be rotatable around an axis extending in the left-right direction, and the receiving portion 471a of the movable stopper body 471 stands up and the seedling receiver 31 is placed on the seedling. An action posture positioned above the placement surface 31A (a solid line posture in FIG. 23) and a non-action posture located below the seedling placement surface 31A of the seedling receiving body 31 when the receiving portion 471a of the movable stopper body 471 falls down. The front movable stopper 470 is configured so that the posture can be changed to (the posture of the two-dot chain line in FIG. 23).

  A rear movable stopper 480 is attached to the rear lower portion of the seedling receiver 31 in the preliminary seedling mount 20 with the same structure as the front movable stopper 470. The front movable stopper 470, the rear movable stopper 480, and the like. However, they are mechanically interlocked and connected by an interlocking mechanism (not shown) composed of an interlocking rod, for example. Thus, when one of the front and rear movable stoppers 470 and 480 is changed in posture, the other of the front and rear movable stoppers 470 and 480 is changed in posture to the same posture.

  By configuring the front and rear movable stoppers 470 and 480 as described above, the front and rear movable stoppers 470 and 480 can be configured to change the posture between the active posture and the non-active posture, and the front end of the seedling receiver 31 is configured. The front and rear end portions can be effectively reinforced by the front and rear movable stoppers 470 and 480.

[Reference form]
In the above-mentioned [Best Mode for Carrying Out the Invention], fixed front and rear fixing stoppers 68, on the front part of the upper preliminary seedling stage 20u and the rear part of the lower preliminary seedling stage 20d, 69, and an example in which movable front and rear movable stoppers 70 and 80 are installed at locations other than these, in the reference form, a fixed seedling stopper and a movable seedling stopper are provided. The structure arrange | positioned in the different position of the preliminary seedling stand 20 is employ | adopted. The configuration will be described below with reference to FIG. FIG. 24 is a schematic side view of the preliminary seedling placement unit F in this reference embodiment.

  As shown in FIG. 24 (a), a fixed front fixing stopper 68 is provided at the front part of the upper stage seedling stage 20u and the front part of the middle stage seedling stage 20m. The front and rear portions of the preliminary seedling stage 20d are equipped with fixed front and rear fixing stoppers 68 and 69, respectively. A rear movable stopper 80 is provided at the rear of the middle stage seedling stage 20m, and the rear movable stopper 80 allows the upper stage and middle stage seedling stage 20u, 20m in the overlapping state from the rear part. It is comprised so that omission of seedling G can be prevented.

  As shown in FIG. 24 (b), when the preliminary seedling placement unit F is switched from the overlapped state to the expanded state, the rear end lower part of the seedling receiving body 31u of the front preliminary seedling placing base 20u is placed on the front and rear central spare seedling placements. The upper end of the front fixed stopper 68 of the rear seedling placing stand 20d is in contact with the upper end of the front fixing stopper 68 of the stand 20m, and the lower rear end of the seedling receiver 31m of the front and rear central seedling placing stand 20m The preliminary seedling platforms 20u and 20d in the unfolded state are positioned and supported.

  In this case, for example, by adopting a configuration in which the first linkage link 61 is supported by the second linkage link 62 in the same manner as the above-mentioned [Best Mode for Carrying Out the Invention] The downward movement of the preliminary seedling stage 20u is restricted and the upward movement of the rear preliminary seedling stage 20d is restricted, and the preliminary seedling stages 20u and 20d in the deployed state are positioned and supported. You may comprise as follows.

  As a result, a step h3 is formed between the seedling placement surface 31A of the front spare seedling table 20u and the seedling placement surface 31A of the front and rear central seedling placement table 20m. A step h4 is formed between the placement surface 31A and the seedling placement surface 31A of the rear seedling placement stand 20d.

  The height of the seedling placement surface 31A of the preliminary seedling placing table 20u located on the front side of the step h3 is higher than the height of the upper end of the front fixing stopper 68 of the preliminary seedling placing table 20m located on the rear side of the step h3. The height of the seedling placement surface 31A of the preliminary seedling placing stand 20m positioned on the front side of the step h4 is higher than the height of the upper end of the front fixing stopper 68 of the preliminary seedling placing stand 20d located on the rear side of the step h4. Also gets higher.

  As a result, while simplifying the overall structure of the seedling stopper, the steps h3 and h4 formed between the front and rear preliminary seedling placing bases 20 cause the front part of the preliminary seedling placing part F to the rear part of the preliminary seedling placing part F. The seedling G can be moved without difficulty.

  In addition, the structure which forms the level | step difference h3, h4 is applicable also in the preliminary seedling mounting part which switches the some preliminary seedling mounting base 20 with the structure different from this reference form to an overlapping state and an expansion | deployment state. Specifically, for example, a foldable spare seedling placement unit that swings and unfolds the upper and lower preliminary seedling placement bases in an overlapping state around the front and rear axis of the middle preliminary seedling placement base ( (Not shown) or, for example, an detachable spare seedling placement part (see FIG. 5) that is attached to the front and rear parts of the middle preliminary seedling stage by removing the upper and lower preliminary seedling stage in the overlapping state from the support frame. The same applies to (not shown).

[Fifth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], in the expanded state of the preliminary seedling placement portion F, the steps h1 and h2 are formed between the front and rear preliminary seedling platforms 20u, 20m, and 20d, and By setting the inclination angle of the seedling placement surface 31A of the front and rear spare seedling platforms 20u, 20m, and 20d to the first to third predetermined angles θ1 to θ3, the preliminary seedling platform on the front side from the heel or the like at the front of the machine body Although the example which was configured so that the seedling G placed on the front part of 20u can be moved to the rear side without difficulty is shown, even if a different configuration is adopted as the configuration for moving the seedling G to the rear side without difficulty Good. Hereinafter, an example thereof will be described with reference to FIG. FIG. 25 is a schematic side view of the preliminary seedling placement unit F in this another embodiment.

  As shown in FIG. 25 (a), a roller 90 is supported on the front and rear portions of the preliminary seedling platforms 20u, 20d, and 20m so as to be rotatable around a left and right axis. The roller 90 is disposed such that the upper end thereof is positioned above the seedling placement surface 31A of the seedling receivers 31u, 31m, 31d.

  Further, in the unfolded state of the preliminary seedling placement portion F, a step h5 is formed between the seedling placement surface 31A of the front seedling receiver 31u and the seedling placement surface 31A of the front and rear center seedling receiver 31m. A step h6 is formed between the seedling placement surface 31A of the center seedling receiver 31m and the seedling placement surface 31A of the rear seedling receiver 31d.

  Thereby, in the unfolded state of the preliminary seedling placement portion F, the roller 90 supported by the preliminary seedling placement base 20 reduces the contact resistance of the bottom portion of the seedling G to the seedling placement surface 31A, and further imposes the seedling G. It can be moved to the rear side.

  As shown in FIG. 25 (b), the front part and rear part of the seedling receiving surface 31A of the seedling receiving bodies 31u, 31m, 31d have a large amount of inclination downward and lower than the seedling mounting surface 31A. Inclined portions 31B and 31C are formed. As a result, the seedling G that has moved to the rear part of the front spare seedling stage 20u is moved to the rear side with momentum by the rear inclined part 31C of the seedling receiver 31u and the front inclined part 31B of the seedling receiver 31m. The seedling G that has moved to the rear part of the preliminary seedling stage 20m at the center of the front and rear is given momentum by the rear inclined part 31C of the seedling receiver 31m and the front inclined part 31B of the seedling receiver 31d. Can be moved to the side.

  Further, in the deployed state of the preliminary seedling placement portion F, a step h7 is provided between the rear end of the seedling placement surface 31A of the front seedling receiving body 31u and the front end of the seedling placement surface 31A of the front and rear seedling receiving body 31m. And a step h8 is formed between the rear end of the seedling placement surface 31A of the seedling receiving body 31m at the front and rear center and the front end of the seedling placement surface 31A of the rear seedling receiving body 31d. Has been.

  Thereby, in the unfolded state of the preliminary seedling placement portion F, the seedling G is further rearwardly pushed by the front and rear inclined portions 31B, 31C formed on the seedling placement surface 31A of the seedling receivers 31u, 31m, 31d. Can be moved to.

  Although not shown, the seedling G is moved to the rear side by any one of the steps h1 to h8, the first to third predetermined angles θ1 to θ3, the roller 90, the front and rear inclined portions 31B and 31C described above. The preliminary seedling placement part F may be configured so as to move without difficulty, and any of the steps h1 to h8, the first to third predetermined angles θ1 to θ3, the roller 90, the front and rear inclined parts 31B and 31C. Alternatively, the preliminary seedling placement unit F may be configured so that the seedling G can be easily moved to the rear side by two or more different combinations.

  Further, also in the preliminary seedling placement section that switches the plurality of preliminary seedling placement stands 20 between the overlapped state and the unfolded state with a structure different from that of the above embodiment, the steps h1 to h8, the first to third predetermined angles θ1 to θ3, the rollers 90, or the front and rear inclined portions 31B and 31C can be applied. Specifically, for example, a foldable spare seedling placement unit that swings and unfolds the upper and lower preliminary seedling placement bases in an overlapping state around the front and rear axis of the middle preliminary seedling placement base ( (Not shown) or, for example, an detachable spare seedling placement part (see FIG. 5) that removes the upper and lower preliminary seedling placement bases from the support frame in an overlapped state and fixes them to the front and rear of the intermediate preliminary seedling placement base (see FIG. The same applies to (not shown).

[Sixth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [Third Another Mode for Carrying Out the Invention] and [Fourth Another Mode for Carrying Out the Invention], the front and rear movable stoppers 70 and 80 are provided. Although the example which comprised the interlocking mechanism linked mechanically by the interlocking rod 85 and interlockingly connecting the front and rear movable stoppers 70 and 80 has been shown, the structure in which the front and rear movable stoppers 70 and 80 are mechanically linked. Different configurations may be adopted. Specifically, although not shown, the front and rear movable stoppers 70 and 80 may be mechanically linked by, for example, a linkage link, a linkage wire (including a push-pull wire), or the like.

[Seventh Embodiment of the Invention]
[Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], [Invention of the Invention] In the fourth alternative embodiment, the fifth alternative embodiment of the invention, and the sixth alternative embodiment of the invention, an example is shown in which the seedling planting device 6 is configured to have a six-row planting specification. The present invention can be similarly applied to a riding type rice transplanter equipped with a seedling planting device (not shown) having different planting strip specifications.

  [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], [Invention of the Invention] In the fourth embodiment of the embodiment, the fifth embodiment of the invention, the sixth embodiment of the invention, and the seventh embodiment of the invention, the spare for the rice paddy machine Although the seedling placement unit F has been shown as an example, the present invention can be similarly applied to different farming machines including a preliminary seedling placement unit. Specifically, for example, the present invention can be similarly applied to a vegetable transplanting machine in which a plurality of pot seedlings are placed in a tray and placed on a preliminary seedling placement unit.

DESCRIPTION OF SYMBOLS 19 Support frame 20 Reserve seedling stand 20u Reserve seedling stand 20m Reserve seedling stand 20d Reserve seedling stand 31A Seedling placement surface 68 Front fixed stopper 70 Front movable stopper 70A Opening portion 80 Rear movable stopper 80A Opening portion 85 Interlocking Rod (interlocking mechanism)
h1 to h4 steps G seedlings (preliminary seedlings)

  The present invention relates to an agricultural working machine including a support frame provided on a lateral side portion of a machine body and a plurality of preliminary seedling platforms supported by the support frame.

  As a conventional technique, for example, as disclosed in Patent Document 1, a reserve seedling stand (8 in FIG. 1 of Patent Document 1) arranged at the front of the traveling machine body is used as a plurality of seedling receiving plates (patents). The first form in which 26u, 26m, and 29d) in FIG. 1 of Document 1 are arranged in a plurality of upper and lower stages, and a plurality of seedling receiving plates (26u, 26m, and 29d in FIG. 4 of Patent Document 1) are arranged in series in front and rear. A riding type rice transplanter configured to be switchable to a second form extending forward is known.

Japanese Patent Laid-Open No. 2007-135506 (see FIGS. 1, 4, 14, 15, and 26)

An object of this invention is to implement | achieve the agricultural working machine which can perform the state switching of several reserve seedling stands simply and rapidly.

[I]
(Constitution)
The first feature of the present invention is that the agricultural machine is configured as follows.
A support frame provided on a lateral side of the machine body, and a plurality of preliminary seedling platforms supported by the support frame via a link mechanism;
By the link mechanism, a plurality of the preliminary seedling platforms are overlapped in a top and bottom multistage and overlapped in plan view, and a plurality of the preliminary seedling platforms are deployed in a straight line in the front-rear direction. A plurality of spare seedling platforms are configured to be switchable,
In the pair of preliminary seedling platforms arranged in the front and rear in the unfolded state, the front portion of the preliminary seedling platform is brought into contact with the rear portion of the preliminary seedling platform on the front side and the front portion of the preliminary seedling platform on the rear side. The rear part of the base and the front part of the rear seedling placing base on the rear side are positioned relative to each other.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the agricultural machine according to the first feature of the present invention .
In the pair of preliminary seedling platforms arranged in the front and rear in the deployed state, the rear side of the preliminary seedling platform is not positioned below the front part of the rear preliminary seedling platform. The rear part of the preliminary seedling stage and the front part of the preliminary seedling stage on the rear side are positioned relative to each other by contacting the rear part of the preliminary seedling stage and the front part of the preliminary seedling stage on the rear side. It is configured to be.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the agricultural machine according to the first or second feature of the present invention.
In the three preliminary seedling platforms,
The upper standby seedling platform in the overlapping state moves forward and downward and is positioned on the front side of the intermediate preliminary seedling platform, and the lower preliminary seedling platform in the overlapping state moves rearward and upward The spare seedling platform is configured to be switchable by the link mechanism so that the preliminary seedling platform is positioned in the rear side of the middle stage so that the preliminary seedling platform is in a developed state that is substantially straight in the front-rear direction. ing.

[IV]
(Constitution)
A fourth feature of the present invention resides in the following configuration in the agricultural machine of the first to third features of the present invention.
A stopper for preventing the seedling from falling off the spare seedling stage in the overlapped state is provided at the front of the preliminary seedling stage,
The stopper is in contact with the rear part of the preliminary seedling stage, so that the rear part of the preliminary seedling stage on the front side and the front part of the preliminary seedling stage on the rear side are positioned relative to each other.

Whole side view of riding type rice transplanter with spare seedling placement section in first reference form overlapping Overall plan view of a riding type rice transplanter in a state where the spare seedling placement part in the first reference form is overlapped Whole side view of riding type rice transplanter in a state in which the preliminary seedling placement part in the first reference form is deployed Overall plan view of a riding type rice transplanter in a deployed state with the preliminary seedling placement portion in the first reference form Side view of spare seedling placement portion in overlapping state in first reference form Transverse plan view of the spare seedling placement portion in the overlap state in the first reference form Front view of spare seedling placement portion in overlapping state in first reference form Side view of the spare seedling placement part in the unfolded state in the first reference form The top view of the reserve seedling mounting part in the expansion | deployment state in 1st reference form The front view of the reserve seedling mounting part in the expansion | deployment state in 1st reference form Longitudinal front view of the attachment part of the seedling receiver in the first reference form Longitudinal front view in the vicinity of the support frame of the preliminary seedling placement portion in the overlapping state in the first reference form The top view of the attachment part of the 1st-3rd frame member in a 1st reference form Side view of the vicinity of the operation tool when the spare seedling placement portion in the first reference form is overlapped The top view of the operation tool vicinity in case the reserve seedling mounting part in a 1st reference form overlaps Side view of the vicinity of the operation tool when the preliminary seedling placement portion in the first reference form is in the unfolded state A longitudinal front view of the vicinity of the operation tool when the preliminary seedling placement portion in the first reference form is in the unfolded state The perspective view which shows the structure of the front part and rear part movable stopper in a 1st reference form Longitudinal side view of the spare seedling placement portion in the unfolded state in the first reference form Schematic side view of the spare seedling placement part in the second reference form Schematic side view of the spare seedling placement part in the third reference form Side view of the vicinity of the front movable stopper in the fourth reference embodiment Detailed view of the vicinity of the front movable stopper in the fifth reference embodiment The schematic side view of the reserve seedling mounting part in embodiment of this invention The schematic side view of the reserve seedling mounting part in 1st another form of implementation of invention

Hereinafter, first to fifth reference embodiments for clarifying the present invention will be described with reference to FIGS. 1 to 23, and embodiments of the present invention will be described with reference to FIG. 24.
[First Reference Form]
[Overall configuration of riding rice transplanter]
The overall configuration of the riding rice transplanter will be described with reference to FIGS. FIG. 1 is an overall side view of the riding rice transplanter with the spare seedling placement unit F in an overlapping state, and FIG. 2 is an overall plan view of the riding rice transplanter with the spare seedling placement unit F in an overlapping state. is there. FIG. 3 is an overall side view of the riding rice transplanter with the preliminary seedling placement unit F in the deployed state, and FIG. 4 is an overall plan view of the riding rice transplanter with the preliminary seedling placement unit F in the deployed state. is there.

  As shown in FIG. 1 to FIG. 4, a driving unit 3 is provided on a machine body supported by a front wheel 1 and a rear wheel 2, and a seedling planting device is provided at a rear part of the machine body via a hydraulic cylinder 4 and a lifting link mechanism 5. A riding type rice transplanter is configured by 6 being supported to be movable up and down.

  The seedling planting device 6 is configured in a six-row planting specification, and includes three transmission cases 7, a planting case 8 that is rotatably supported on the right and left lateral sides of the rear portion of the transmission case 7, and planting A pair of planting arms 8 a provided at both ends of the case 8, a grounding float 9, a seedling platform 10 on which seedlings are placed, and the like are provided. As a result, the planting case 8 is rotationally driven as the seedling platform 10 is driven back and forth to the left and right, and the planting arm 8a alternately takes out the seedlings from the lower part of the seedling platform 10 and puts them on the rice field. Plant.

  A driver's seat 12 is provided at the rear of the floor 11 in the driver 3, and a fertilizer application device 13 that supplies fertilizer to the rice field with planting seedlings is provided on the rear side of the driver's seat 12. A bonnet 14 covering the engine E is provided in front of the floor 11, and a steering handle for steering the front wheel 1 is provided at the upper part of the bonnet 14. Right and left lateral sides of the bonnet 14 are provided with right and left steps 15 connected to the floor 11, and right and left auxiliary steps 16 are provided on both lateral sides of the floor 11 and step 15. It has been.

  An operation arm 17 capable of operating the riding type rice transplanter from the front of the aircraft is supported in a swingable manner around the left and right axis of the front of the engine frame 18 at the center of the left and right of the front of the aircraft. The posture can be changed between a standing posture standing on the front side of the bonnet 14 (the solid line posture in FIG. 3) and a lying posture lying forward and downward from this standing posture (a two-dot chain line posture in FIG. 3). Yes. In the lying posture of the operation arm 17, the downward swing of the operation arm 17 is restricted, and the operation arm 17 can be operated to push down the front part of the machine body. As a result, the riding type rice transplanter can be operated from the front of the aircraft while pushing down the front of the aircraft with the operation arm 17, so that the crossing work can be easily performed.

[Detailed structure of spare seedling placement part]
Based on FIGS. 1-17, the detailed structure of the reserve seedling mounting part F is demonstrated. FIG. 5 is a side view of the spare seedling placement unit F in the overlapping state, and FIG. 6 is a cross-sectional plan view of the spare seedling placement unit F in the overlapping state (plan view of the intermediate seedling seeding stage 20m). FIG. 7 is a front view of the spare seedling placement unit F in an overlapping state. 8 is a side view of the spare seedling placement unit F in the deployed state, FIG. 9 is a plan view of the preliminary seedling placement unit F in the deployed state, and FIG. 10 is a spare seedling in the deployed state. It is a front view of the mounting portion F (a front view of the preliminary seedling placing stand 20m at the front and rear center).

  FIG. 11 is a longitudinal front view of the attachment portion of the seedling receiver 31, and FIG. 12 is a longitudinal front view of the vicinity of the support frame 19 of the preliminary seedling placement portion F in an overlapping state. FIG. 13 is a plan view of the attachment portion of the first to third frame members 30, 50, 51. FIG. 13 (a) shows the upper stage seedling mounting base 20u, and FIG. 13 (b) shows the middle stage spare. The seedling stage 20m is shown in FIG. 13C, and the lower stage seedling stage 20d is shown in FIG. FIG. 14 is a side view of the vicinity of the operation tool 46 when the spare seedling placement unit F is overlapped, and FIG. 15 is a plan view of the vicinity of the operation tool 46 when the spare seedling placement unit F is overlapped.

  16 is a side view of the vicinity of the operation tool 46 when the preliminary seedling placement unit F is in the deployed state, and FIG. 17 is a longitudinal front view of the vicinity of the operation tool 46 when the preliminary seedling placement unit F is in the deployed state. . In the following description, the spare seedling placement part F equipped on the left side of the front part of the aircraft will be described as an example. However, other configurations are the same except that the left and right sides are different.

  As shown in FIGS. 1 and 2, an engine frame 18 extends forward from the engine E, and left and right support frames 19 that support the preliminary seedling placement portion F are fixed to the engine frame 18. . As a result, left and right support frames 19 are mounted on the left and right lateral sides of the front of the machine body.

  On the laterally outer side of the support frame 19, three stages of preliminary seedling platforms 20 are arranged one above the other, and preliminary seedling placement units F are arranged on the right and left sides of the front part of the machine body. In the spare seedling placement section F, the overlapping state (the state shown in FIGS. 1 and 2) in which the three spare seedling placement bases 20 are overlapped in plan view, and the three preliminary seedling placement bases 20 are slightly inclined. It is configured to be switchable to a developed state (the state shown in FIG. 3 and FIG. 4) that is inclined substantially rearward and downward. In the following description, among the three stages of the spare seedling stage 20 in the overlapping state, the upper stage seedling stage is indicated as 20u, the middle stage seedling stage is indicated as 20m, and the lower stage spare seedling stage is indicated as 20m. The platform is displayed as 20d. Further, the seedling receiver constituting the upper preliminary seedling stage 20u is indicated as 31u, the seedling receiver constituting the middle preliminary seedling stage 20m is indicated as 31m, and the lower preliminary seedling stage 20d is configured. The seedling receiver is displayed as 31d.

  As shown in FIGS. 5 to 7 and 12, a bracket 21 is fixed to the upper portion of the support frame 19, and a boss portion 22 is formed between the bracket 21 and the upper end portion of the support frame 19. Yes. The boss portion 22 is formed with a left and right through hole, and a central support shaft 23 is supported in the through hole so as to be rotatable around a horizontal axis P1. A boss of the first frame member 30 in the shape of a square pipe that is long in the front-rear direction with a central boss 61A of a first linkage link 61, which will be described later, being rotatably fitted to the outer end of the central support shaft 23. The part 30a is fitted and fixed.

  Angle-shaped front and rear frames 24 and 25 are fixed to the front and rear portions of the bracket 21, and the front and rear frames 24 and 25 are on the inner surface side of the front and rear portions of the first frame member 30. It is fastened and fixed. Thus, the first frame member 30 is fixed to the upper portion of the support frame 19 via the front and rear frames 24 and 25, the bracket 21, and the central support shaft 23.

  As shown in FIGS. 5 to 7, the intermediate stage seedling placing stand 20 m includes a first frame member 30 and a seedling receiving body 31 m connected to the first frame member 30. A U-shaped front and rear brackets 32 and 33 having a longitudinal sectional shape opened downward in a side view are fixed to the upper surface side of the front and rear portions of the first frame member 30.

  The seedling receiver 31m is made of a resin and is formed in a rectangular shape that is long in the front-rear direction in a plan view, and left and right side portions thereof have left and right protrusions protruding upward from a seedling placement surface 31A on which the seedling G is placed. Sidewall portions 31a are formed. The front part and the rear part of the seedling receiver 31m are open in the front-rear direction, and no walls are provided at the front part and the rear part of the seedling receiver 31m.

  An opening 31b is formed in the left and right central portion of the front portion of the seedling receiver 31m, and is recessed in the rear side in a plan view and opened upward and downward. An opening 31c is formed which is recessed in the front side in plan view and is open at the top and bottom. Thereby, in the unfolded state of the preliminary seedling placement portion F, which will be described later, in the cooperation with the opening portions 31b, 31c of the front and rear seedling receivers 31u, 31d, The manual insertion holes H can be formed at two locations, the front part and the rear part of the seedling placement surface 31A of the seedling receiving body 31m when the preliminary seedling placement part F is deployed (see FIG. 9).

  As a result, a hand is inserted from the upper side of the front and rear hand insertion holes H, and the seedling G placed on the preliminary seedling placement table 20m at the front and rear center when the preliminary seedling placement unit F is in the expanded state is easily moved upward. It can be pulled up and taken out, and the workability of taking out the seedling G from the preliminary seedling placing stand 20m in the expanded state can be improved.

  A frame-shaped frame 34 formed in a U shape in a plan view by a round bar is fastened and fixed to the lower part of the seedling receiver 31m from the lower side. A bracket 35 is fixed. Thereby, the seedling receiver 31 is supported by the frame-like frame 34 fixed to the front and rear connecting brackets 35.

  As shown in FIG. 5 to FIG. 7 and FIG. 11, the front and rear connecting brackets 35 are connected to each other so as to be rotatable around the left and right axial centers a of the front and rear brackets 32 and 33, respectively. As a result, as shown in FIG. 11A, the seedling receiver 31m and the frame-shaped frame 34 are supported on the first frame member 30 side so as to be swingable about the left and right axis a.

  A positioning contact portion 35a is formed in the lower part of the front and rear connecting brackets 35. The positioning contact portion 35a contacts the outer surface side of the first frame member 30, so that the seedling receiver 31m and the frame shape are formed. The range of the downward swing of the frame 34 is restricted.

  The height of the front bracket 32 is set to be higher than the height of the rear bracket 33, whereby the seedling placement surface 31A of the seedling receiving body 31m connected to the front and rear brackets 32, 33 is obliquely rearward and downward. It is comprised so that it may incline.

  In the upper part of the front and rear connection brackets 35, long slots 35 b are formed on the left and right, and the front and rear brackets 32, 33 are connected to the slot 35 b via a support shaft 36. A plate-like member 35 c is fixed to the upper ends of the front and rear connecting brackets 35.

  As shown in FIGS. 7 and 11 (b), the seedling receiver 31m and the frame-like frame 34 are swung upward around the axis a in the left-right direction, and the elongated hole 35a is moved downward along the support shaft 36. By pushing the seedling receiver 31m and the frame-shaped frame 34 slightly downward so as to move, the plate-like members 35c of the front and rear connecting brackets 35 abut against the inner ends of the front and rear brackets 32, 33, The state where the seedling receiver 31m and the frame-shaped frame 34 are erected upward and swinging can be maintained. As a result, the standing stage 20m in the middle stage is set up in an upright position (position shown by a two-dot chain line in FIGS. 7 and 10) and used in a downward position (in FIGS. 7 and 10). The posture can be changed to a posture of a solid line), and these postures can be held.

  As shown in FIG. 6, a front boss portion 30 b in which a left and right through hole is formed is formed at the front end portion of the first frame member 30, and at the rear end portion of the first frame member 30, A rear boss portion 30c is formed in which left and right through holes are formed.

  As shown in FIG. 5 to FIG. 7 and FIG. 12, on the upper surface side in the front and rear central portion of the first frame member 30, a vertically long rectangular pipe-shaped vertical frame 30d extends. A first support member 37 is fixed to the upper end portion.

  As shown in FIGS. 12 and 14, the first support member 37 is formed in a U-shape in which a longitudinal sectional shape in a front view is opened upward, and a lower end portion thereof is fixed to an upper end of the vertical frame 30 d. ing. Accordingly, the second frame member 50 of the upper preliminary seedling table 20u enters from the upper side between the outer plate and the inner plate of the first support member 37 in the overlapping state of the preliminary seedling placement portion F, and the upper stage The preliminary seedling stage 20u is supported by the vertical frame 30d via the first support member 37.

  By supporting the second frame member 50 on the vertical frame 30d, the upper preliminary seedling stage 20u can be stably supported, and not only the upper preliminary seedling stage 20u but also a link mechanism 60 described later. Thus, it is possible to effectively prevent rattling or the like of the lower preliminary seedling table 20d connected to each other.

  An outer inclined portion 37A inclined obliquely outward and upward is formed at the upper end portion of the outer plate of the first support member 37, and inclined upward and obliquely upward at the upper portion of the inner plate of the first support member 37. An inner inclined portion 37B is formed.

  When the preliminary seedling placement portion F is switched from the expanded state to the overlapped state, the tip of the lock pin 43 of the lock mechanism 40 described later contacts the outer inclined portion 37A formed on the outer plate of the first support member 37. The lock pin 43 of the lock mechanism 40 to be described later automatically moves inward against the urging force of the elastic spring 44. As a result, when the preliminary seedling placement unit F is switched from the deployed state to the overlapped state, the preliminary seedling placement unit F is duplicated from the deployed state without pulling the lock operation tool 45 of the lock mechanism 40 described later inside. It is possible to switch to a state, and it is possible to easily switch the state of the preliminary seedling placement unit F.

  When switching the preliminary seedling placement portion F from the expanded state to the overlapping state, the second frame member 50 of the upper preliminary seedling placement base 20u is guided by the inner inclined portion 37B formed on the inner plate of the first support member 37. While being done, it enters between the outer plate and the inner plate of the first support member 37. As a result, the upper stage seedling platform 20u can be easily switched from the deployed state to the overlapped state, and the preliminary seedling placement unit F can be prevented from rattling in the left-right direction of the upper stage seedling platform 20u in the overlapped state. It can be effectively prevented.

  A support hole portion 37C for supporting a support pin 42 of the lock mechanism 40 described later is formed in the front portion of the outer plate of the first support member 37. The shape of the support hole portion 37C is the preliminary seedling placement portion F. Is formed in a shape along the rotation trajectory of the support pin 42 when switching between the expanded state and the overlapped state, and the shaft center of the support pin 42 is supported while the support pin 42 enters the support hole portion 37C. It is formed in a shape that enters the hole 37C.

  A lock hole 37D into which a lock pin 43 of the lock mechanism 40 described later is inserted is formed in the rear portion of the outer plate of the first support member 37, and the tip of the lock pin 43 of the lock mechanism 40 enters into the lock hole 37D. Thus, the state in which the second frame member 50 enters between the outer plate and the inner plate of the first support member 37 can be maintained.

  As shown in FIGS. 12, 14, and 15, a lock mechanism 40 that locks the preliminary seedling placement portion F in the expanded state and the overlapped state is provided on the upper portion of the second frame member 50 in the front and rear central portion. . On the upper surface side of the second frame member 50, a U-shaped bracket 41 having a longitudinal sectional shape opened upward in a front view is fixed.

  A left and right support pin 42 is fitted into the front portion of the bracket 41 and is fixed so as to protrude laterally outward. A left and right through hole is formed in the rear portion of the bracket 41, and a left and right lock pin 43 is fitted into the through hole. An elastic spring 44 is mounted across the lock pin 43 and the bracket 41, and the elastic spring 44 biases the lock pin 43 outward (the side where the tip of the lock pin 43 protrudes from the outer surface of the bracket 41). Has been.

  A tapered portion 43a is formed at the distal end portion of the lock pin 43, and the tapered portion 43a allows the distal end of the lock pin 43 to be comfortably locked to the lock hole 37D (locking portion) of the first support member 37 (second support member 38). The lock pin 43 can be inserted into the hole 38D) when the tip of the lock pin 43 comes into contact with the outer inclined portion 37A (outer inclined portion 38A) of the first support member 37 (second support member 38). It can be moved inward without difficulty.

  A lock operation tool 45 formed in a loop shape by a round bar is fixed to the inner end portion of the lock pin 43. The size of the opening formed in the loop shape of the lock operation tool 45 is determined by the operator. The size is set such that a plurality of fingers can be inserted (see FIG. 15).

  As a result, when the lock operating tool 45 is pulled inward against the urging force of the elastic spring 44, the distal end portion of the lock pin 43 is locked to the lock hole 37 </ b> D (the second support member 38). The unlocking state (the state shown in FIG. 15B) of the lock mechanism 40 that has come out of the lock hole 38D) can appear, and the pulling operation to the inside of the lock operating tool 45 is stopped, so that the biasing force of the elastic spring 44 The lock state (state shown in FIG. 15A) of the lock mechanism 40 in which the distal end portion of the lock pin 43 enters the lock hole 37D (lock hole 38D) of the first support member 37 (second support member 38) can be revealed. .

  On the rear part of the second frame member 50, an operating tool 46 that is gripped by an operator when switching the state of the spare seedling placement unit F is provided. The operation tool 46 includes a round pipe-shaped frame member 46a and a resin grip 46b attached to the frame member 46a.

  Although not shown, a configuration in which the operation tool 46 is installed at different positions may be employed, or a configuration in which the operation tool 46 is installed in parts other than the second frame member 50 may be employed. A configuration equipped with 46 may be employed. Specifically, for example, the third frame member 51 may be equipped with the operation tool 46 so that the operation tool 46 can be easily operated at a low height, for example, the link mechanism 60 (first to third linkages). You may employ | adopt the structure which equips the links 61-63) with the operation tool 46. FIG. Further, for example, an operation tool 46 is provided at the front end portion and the rear end portion of the second or third frame member 50, 51 so that the operation from the front side and the rear side of the preliminary seedling placement portion F can be performed more easily. May be.

  The base portion of the frame member 46a is fixed to the inner surface side of the rear portion of the second frame member 50, and the frame member 46a extends inward from the portion fixed to the second frame member 50 and extends inwardly. A frame member 46a is formed in a shape that extends substantially horizontally forward from the end, and extends obliquely forward and upward from an extended end that extends substantially horizontally forward, and is inclined obliquely upward and forward. The grip 46b is externally fitted to the part.

  A predetermined gap is formed between the grip portion 46 b of the operation tool 46 and the outer end of the lock operation tool 45, so that the lock operation tool 45 resists the urging force of the elastic spring 44. The pulling operation is allowed.

  As shown in FIGS. 14 and 15, the lock operation tool 45 of the lock mechanism 40 is arranged in the direction along the grip 46 b of the operation tool 46 in a side view, whereby the operator When the operator grips the grip 46b of the operation tool 46, all or part of the finger other than the operator's thumb is inevitably configured to easily enter the loop-shaped opening of the lock operation tool 45. Yes.

  Thereby, substantially simultaneously with gripping the grip portion 46b of the operation tool 46, a finger is inserted into the opening of the lock operation tool 45, the lock operation tool 45 is operated inward, and the lock mechanism 40 is operated in the unlocked state. Thus, the operation tool 46 and the lock operation tool 45 can be operated with one hand. As a result, the operability of the operation tool 46 and the lock operation tool 45 can be improved.

  In the overlapping state of the spare seedling placement part F, the lock mechanism 40 and the grip part 46b of the operation tool 46 are arranged in the front and rear center part of the second frame member 50 (front and rear center part inside the upper stage seedling placement base 20u). Therefore, the state of the preliminary seedling placement portion F can be switched by operating the lock mechanism 40 and the operation tool 46 from the driver seat 12 side (rear side), and from the heel or the like (front side) of the front of the machine body The state of the preliminary seedling placement portion F can be switched by operating the lock mechanism 40 and the operation tool 46. Thereby, the lock mechanism 40 and the operation tool 46 can be disposed at appropriate positions that are easy to operate from the front side and the rear side, and the workability of the state switching work of the preliminary seedling placement unit F can be improved.

  In this case, the operator sitting on the driver's seat 12 stands up from the driver's seat 12 and extends the right hand or the left hand to the front and easily reaches the position where the operator can reach easily. An operation tool 46 is provided. Thereby, the state of the preliminary seedling placement unit F can be switched easily and quickly, and the workability of the state switching operation of the preliminary seedling placement unit F can be improved. In addition, in a small riding rice transplanter, for example, while standing on the driver's seat 12, the operator holds the operation tool 46 of the spare seedling placement unit F in an overlapping state, and stands on the driver's seat 12 while standing up from the driver's seat 12. The placement unit F may be configured to be switched to the deployed state. For example, the preliminary seedling stage F may be configured to be switched to the deployed state while being seated on the driver seat 12.

  As described above, in the case where the configuration in which the operation tool 46 is equipped at different positions or different parts is adopted, the configuration in which the lock mechanism 40 is equipped at different positions or different parts in accordance with the position change of the operation tool 46 is adopted. It may be adopted.

  As shown in FIG. 5, the upper preliminary seedling table 20 u is configured to include a second frame member 50 and a seedling receiver 31 u connected to the second frame member 50. A U-shaped front and rear brackets 32 and 33 having a longitudinal sectional shape opened downward in a side view are fixed to the upper surface side of the front and rear portions of the second frame member 50. The front and rear brackets 32 and 33 have the same structure as the front and rear brackets 32 and 33 fixed to the first frame member 30.

  As shown in FIG. 9, the seedling receiver 31u is made of resin and is configured to have the same external shape as the middle seedling receiver 31m. Left and right side wall portions 31a protruding upward from the surface 31A are formed. The front part and the rear part of the seedling receiver 31u are opened in the front-rear direction, and no walls are provided at the front part and the rear part of the seedling receiver 31u.

  An opening 31b is formed in the left and right central portion of the front portion of the seedling receiver 31u and is recessed in the rear side in a plan view and opened upward and downward. An opening 31c is formed which is recessed in the front side in plan view and is open at the top and bottom. As a result, when the preliminary seedling placement portion F is in the unfolded state, a horizontally long rectangular hand that is long in the left and right in plan view, in cooperation with the rear opening 31c and the opening 31b of the front and rear seedling receiver 31m. The insertion hole H can be formed.

  Even if the seedling G is not moved to the front side by the opening 31b of the front seedling receiving body 31u when the preliminary seedling placing part F is in the unfolded state, the seedling G remains in the state of being placed on the seedling receiving body 31u. The seedling G can be easily pulled up and taken out, and the workability of taking out the seedling G from the preliminary seedling placement portion F in the expanded state can be improved.

  As shown in FIGS. 5 and 7, a frame-shaped frame 34 having the same structure as that of the middle stage seedling mounting base 20 m is fastened and fixed to the lower part of the seedling receiver 31 u from below. The front and rear connecting brackets 35 are fixed to the inner end. Thereby, the seedling receiver 31u is supported by the frame-like frame 34 fixed to the front and rear connecting brackets 35.

  The front and rear connection brackets 35 are connected to each other so as to be rotatable around the left and right axial centers b of the front and rear brackets 32 and 33, respectively. As a result, the seedling receiver 31u and the frame-shaped frame 34 are supported on the second frame member 50 side so as to be swingable around the axis b in the left-right direction.

  The front and rear connecting brackets 35, and the front and rear brackets 32, 33 are configured in the same structure as the middle stage seedling placing table 20m, and the upper stage seedling placing table 20m is the same as the middle stage seedling placing table 20m. The stand 20u can be changed to a standing posture that swings upward and stands up and a use posture that falls down, and can be held in these postures.

  As shown in FIG. 13 (a), a central boss portion 50 a in which a left and right through hole is formed is formed at the front and rear central portion of the second frame member 50, and the rear end of the second frame member 50. The part is formed with a rear boss part 50b in which left and right through holes are formed.

  As shown in FIG. 5, the lower preliminary seedling stage 20 d includes a third frame member 51 and a seedling receiver 31 d connected to the third frame member 51. A U-shaped front and rear brackets 32 and 33 having a longitudinal sectional shape opened downward in a side view are fixed to the upper surfaces of the front and rear portions of the third frame member 51. The front and rear brackets 32 and 33 have the same structure as the front and rear brackets 32 and 33 fixed to the first and second frame members 30 and 50.

  As shown in FIG. 9, the seedling receiver 31d is made of resin and has the same external shape as the upper and middle seedling receivers 31u and 31m, and the seedlings G are placed on the left and right sides thereof. Left and right side wall portions 31a protruding upward from the seedling placement surface 31A to be formed are formed. The front part and the rear part of the seedling receiver 31d are open in the front-rear direction, and no walls are provided at the front part and the rear part of the seedling receiver 31d.

  An opening 31b is formed in the left and right central portion of the front portion of the seedling receiving body 31d so as to be recessed rearward in a plan view and open upward and downward. An opening 31c is formed which is recessed in the front side in plan view and is open at the top and bottom. Thereby, when the preliminary seedling placement part F is in the unfolded state, a horizontally long rectangular hand is inserted in the plan view in the left and right directions in cooperation with the opening 31b on the front side and the opening 31c of the seedling receiver 31m at the front and rear center. A hole H can be formed.

  Even if the seedling G is not moved rearward by the rear opening 31b when the preliminary seedling placement portion F is in the unfolded state, the seedling G remains in the state where it is placed on the seedling receiver 31d. Can be easily pulled up and taken out, and the workability of taking out the seedling G from the preliminary seedling placement portion F in the unfolded state can be improved.

  As shown in FIGS. 5 and 7, a frame-like frame 34 having the same structure as the upper and middle preliminary seedling platforms 20u and 20m is fastened and fixed to the lower part of the seedling receiver 31d from below. Front and rear connecting brackets 35 are fixed to the inner end of the frame 34. As a result, the seedling receiver 31 and the frame-shaped frame 34 are supported on the third frame member 51 side so as to be swingable around the left-right axis c.

  The front and rear connection brackets 35 are connected to each other so as to be rotatable around the left and right axial centers c of the front and rear brackets 32 and 33, respectively. Thereby, the seedling receiver 31d and the frame-shaped frame 34 are supported on the third frame member 51 side so as to be swingable around the axis c in the left-right direction.

  The front and rear connecting brackets 35 and the front and rear brackets 32, 33 are configured in the same structure as the upper and middle preliminary seedling platforms 20u, 20m, and the upper and middle preliminary seedling platforms 20u, 20m Similarly, the lower stage seedling stage 20d is configured to be able to change the posture between an upright posture that swings upward and stands up, and a use posture that falls down, and can be held in these postures.

  As shown in FIG. 13 (c), a central boss portion 51 a in which a left and right through hole is formed is formed in the front and rear central portion of the third frame member 51, and the front end portion of the third frame member 51. Is formed with a front boss portion 51b in which left and right through holes are formed.

  As shown in FIGS. 5 to 7, the first, second, and third frame members 30, 50, 51 are interlocked and connected via a parallel link type link mechanism 60. The link mechanism 60 includes a first linkage link 61 provided across the first, second, and third frame members 30, 50, 51 and a first link provided across the first and second frame members 30, 50. The second linkage link 62 and the third linkage link 63 provided across the first and third frame members 30 and 51 are configured.

  As shown in FIGS. 5 and 13, the first linkage link 61 is formed of a round pipe material, and a central boss portion 61 </ b> A in which a laterally-facing linkage hole is formed in the front and rear central portion thereof is formed. A left and right first support shaft 61B is fixed to the front end, and a left and right second support shaft 61C is fixed to the rear end.

  The second linkage link 62 is made of a round pipe material, and has a first boss portion 62A formed with a left and right linkage hole at one end thereof, and a left and right linkage hole formed at the other end. A second boss portion 62B is formed. The third linkage link 63 is formed of a round pipe material. A boss portion 63A having a left and right linkage hole is formed at one end thereof, and a left and right support shaft 63B is fixed to the other end portion. Yes.

  As shown in FIG. 13B, the central boss 61 </ b> A of the first linkage link 61 is rotatably fitted on the central support shaft 23 supported by the upper end of the support frame 19. Thereby, the front-rear center part of the first linkage link 61 is supported so as to be rotatable around the center axis P <b> 1 in the left-right direction of the center support shaft 23.

  As shown in FIG. 13 (c), the first support shaft 61B of the first linkage link 61 has a left and right axis P3 around the front boss portion 51b of the third frame member 51 of the lower preliminary seedling mount 20d. It is linked in a freely rotatable manner. As shown in FIG. 13 (a), the second support shaft 61C of the first linkage link 61 is arranged around the axial center P2 in the left-right direction on the rear boss portion 50b of the second frame member 50 in the upper preliminary seedling mount 20u. It is linked so that it can rotate freely.

  As shown in FIG. 13 (b), the boss portion 62A of the second linkage link 62 is arranged on the left and right sides of the front boss portion 30b of the first frame member 30 in the intermediate preliminary seedling platform 20m via the front support shaft 64. It is linked so as to be rotatable around the axial center P4. As shown in FIG. 13 (a), the second boss portion 62B of the second linkage link 62 is directed left and right via the support shaft 65 to the central boss portion 50a of the second frame member 50 in the upper stage seedling mounting base 20u. Are linked so as to be rotatable around the axis P5.

  As shown in FIG. 13 (c), the boss portion 63A of the third linkage link 63 is laterally directed to the central boss portion 51a of the third frame member 51 of the lower preliminary seedling stage 20d via a support shaft 66. It is linked so as to be rotatable around the axis P7. As shown in FIG. 13 (b), the support shaft 63B of the third linkage link 63 rotates about the left-right axis P6 around the rear boss 30c of the first frame member 30 in the intermediate stage seedling mounting base 20m. It is linked freely.

  As shown in FIGS. 5 and 8, at the end of the second linkage link 62 on the second boss portion 62B side, the front and rear central portions (preliminary seedlings) of the second linkage link 62 when the spare seedling placement portion F is unfolded. The second support member 38 is fixed to the upper part of the second linkage link 62 in a state where the placement portion F is overlapped.

  As shown in FIGS. 16 and 17, the second support member 38 is formed in a U-shape with the longitudinal section in the front view opened upward, and the inner plate at the lower end thereof is the second linkage link 62. It is fixed to the side. As a result, the second frame member 50 of the upper preliminary seedling table 20u is inserted from above between the outer plate and the inner plate formed on the second support member 38 in the deployed state of the preliminary seedling placement unit F. Thus, the upper stage seedling stage 20 u is supported by the second linkage link 62 via the second support member 38.

  An outer inclined portion 38A that is inclined obliquely upward is formed at the upper end of the outer plate of the second support member 38, and is inclined obliquely inwardly upward at the upper portion of the inner plate of the second support member 38. An inner inclined portion 38B is formed.

  In the case where the preliminary seedling placement portion F is switched from the overlapped state to the expanded state, the tip of the lock pin 43 of the lock mechanism 40 contacts the outer inclined portion 38A formed on the outer plate of the second support member 38, It automatically moves inward against the biasing force of the elastic spring 44. As a result, when the spare seedling placement unit F is switched from the overlapped state to the deployed state, the preliminary seedling placement unit F is deployed from the overlapped state without pulling the lock operation tool 45 of the lock mechanism 40 described later inside. It is possible to switch to a state, and it is possible to easily switch the state of the preliminary seedling placement unit F.

  When switching the preliminary seedling placement portion F from the overlapping state to the unfolded state, the second frame member 50 of the upper preliminary seedling placement base 20u is guided by the inner inclined portion 38B formed on the inner plate of the second support member 38. While being done, it enters between the outer plate and the inner plate of the second support member 38. Thereby, the position of the upper preliminary seedling stage 20u can be changed without difficulty, and rattling of the upper preliminary seedling stage 20u in the left-right direction can be effectively prevented when the preliminary seedling stage F is deployed.

  A support hole portion 38C for supporting the support pin 42 of the lock mechanism 40 is formed in the front portion of the outer plate of the second support member 38. The shape of the support hole portion 38C is such that the preliminary seedling stage 20 is unfolded. In the case of switching to the overlapping state, the support pin 42 is formed in a shape along the relative trajectory of the rotation, and the axis of the support pin 42 enters the support hole 38C in a state where the support pin 42 is inserted. It is formed in such a shape.

  A lock hole 38D into which the lock pin 43 of the lock mechanism 40 enters is formed at the rear portion of the outer plate of the second support member 38, and the tip of the lock pin 43 of the lock mechanism 40 enters into the lock hole 38D. The state where the second frame member 50 enters between the outer plate and the inner plate of the second support member 38 can be maintained.

  Thus, the lock mechanism 40 can function as a locking device that locks the preliminary seedling stage 20 in an overlapped state in cooperation with the first support member 37, and in cooperation with the second support member 38. The preliminary seedling placement part F can be made to function as a locking tool that locks the preliminary seedling placement part F in the deployed state. Simplification can be achieved.

  In the overlapping state and the unfolded state of the preliminary seedling placement portion F, the support pin 42 is engaged with the support holes 37C and 38C and the second frame member 50 is supported by the first or second support members 37 and 38. Therefore, the second frame member 50 can be supported by the first or second support member 37, 38 with a dedicated support pin 42, which is different from the lock pin 43 of the lock mechanism 40. Thereby, for example, it is possible to prevent an excessive load from the second frame member 50 from acting on the lock pin 43 to make it difficult for the lock pin 43 to come out, and to lock the lock holes 37D of the first or second support members 37, 38. Since the lock pin 43 of the lock mechanism 40 can be easily inserted and removed from 38D, the lock operation tool 45 of the lock pin 43 can be operated with a relatively small operation force.

  Further, it is possible to prevent the lock holes 37D and 38D of the first or second support members 37 and 38 and the lock pin 43 of the lock mechanism 40 from being damaged due to wear or the like. As a result, the second frame member 50 can be stably supported by the first or second support members 37 and 38, and the overlapping state and the unfolded state of the preliminary seedling placement portion F are securely locked by the lock mechanism 40. can do.

  The locking mechanism 40 can be positioned in the vicinity of the first or second support members 37 and 38 that support the second frame member 50 in the overlapping state and the deployed state of the preliminary seedling placement portion F. Thereby, for example, at the time of assembling the preliminary seedling placement portion F, the position of the lock pin 43 of the lock mechanism 40 and the lock holes 37D and 38D of the first or second support members 37 and 38 can be easily aligned. The workability of the assembly work of the preliminary seedling placement portion F can be improved, and the position of the lock holes 37D and 38D and the position of the lock pin 43 can be changed by the bending of the second frame member 50 by placing the seedling G. Misalignment can be prevented.

[Detailed structure of seedling stopper]
The detailed structure of the seedling stopper provided in the preliminary seedling placement unit F will be described with reference to FIGS. 5 to 7, 9, and 18. FIG. 18 is a perspective view showing the structure of the front and rear movable stoppers 70 and 80. As shown in FIGS. 5 to 7, the seedling stopper includes a fixed front fixing stopper 68 provided at the front end of the preliminary seedling table 20 u and a fixing provided at the rear end of the preliminary seedling table 20 d. A rear fixed stopper 69 of the type, a movable front movable stopper 70 disposed across the front part of the preliminary seedling stage 20m and the front part of the preliminary seedling stage 20d, and the rear part of the preliminary seedling stage 20u A movable rear movable stopper 80 disposed over the rear seedling stand 20m is provided.

  As shown in FIGS. 5 and 9, a front fixing stopper 68 is fastened and fixed to the front portion of the seedling receiver 31u from the lower surface side, and the front fixing stopper 68 has a longitudinal sectional shape in a side view. Is formed in an angle shape.

  The height of the upper end of the receiving portion 68a in the front fixing stopper 68 is higher than the seedling placement surface 31A of the seedling receiving body 31u and lower than the upper end of the tray of the seedling G placed on the seedling receiving body 31u. (Refer to FIG. 7), the width in the left-right direction of the front fixing stopper 68 is set to a length that can partially receive and support the inner part of the seedling G placed on the seedling receiver 31u. Yes. Thereby, it is possible to effectively prevent the seedling G from dropping off from the front portion of the upper preliminary seedling stage 20u in the overlapped state and the deployed state by the front fixing stopper 68.

  A rear portion fixing stopper 69 is fastened and fixed to the rear portion of the seedling receiving body 31d from the lower surface side of the inner portion thereof. The rear portion fixing stopper 69 is formed in an angle shape in a vertical cross section when viewed from the side.

  The height of the upper end of the receiving portion 69a in the rear fixed stopper 69 is higher than the seedling placement surface 31A of the seedling receiving body 31d and lower than the upper end of the tray of the seedling G placed on the seedling receiving body 31d. The width in the left-right direction of the rear fixing stopper 69 is set to a length that can partially receive and support the inner part of the seedling G placed on the seedling receiver 31d. Thereby, the rear fixed stopper 69 can effectively prevent the seedling G from dropping out from the rear part of the lower preliminary seedling mounting base 20d when the preliminary seedling mounting part F is overlapped and deployed.

  By constituting the front and rear fixed stoppers 68 and 69 as described above, the front end portion of the seedling receiver 31u and the rear end portion of the seedling receiver 31d are effectively reinforced by the front and rear movable stoppers 68 and 69. Therefore, the downward bending of the seedling receivers 31u and 31d with the seedling G placed thereon can be reduced. As a result, the seedling G can be stably supported on the preliminary seedling platforms 20u and 20d, and the seedling receivers 31u and 30d formed of resin can be prevented from being damaged.

  In this embodiment, the front and rear fixing stoppers 68 and 69 are formed of parts different from the seedling receivers 31u and 31d, and the parts of the seedling receivers 31u and 31d and the seedling receiver 31m are shared. However, a configuration in which the front and rear fixing stoppers 68 and 69 are integrally formed with the seedling receivers 31u and 31d with a resin may be employed.

  As shown in FIG. 5 to FIG. 7 and FIG. 18, the front part of the first frame member 30 of the intermediate stage seedling stand 20 m is a U-shaped front part whose longitudinal sectional shape is opened forward in a side view. A bracket 53 is fixed. The front bracket 53 is formed with a vertical through hole, and the front movable stopper 70 is supported in the through hole so as to be swingable around the vertical axis d.

  The front movable stopper 70 includes a movable stopper main body 71 and a plate-like member 72. The movable stopper main body 71 of the front movable stopper 70 is formed by bending a round bar, so that an upper receiving portion 71A for receiving and supporting the seedling G placed on the intermediate seedling placing stand 20m is formed on the upper portion thereof. In the lower part, a lower receiving part 71B for receiving and supporting the seedling G placed on the lower preliminary seedling mounting base 20d is formed, and the outer shape in front view in the action posture described later is opened outward. Shaped in a letter shape.

  A flat plate-like plate member 72 is fixed to the end of the upper receiving portion 71A, and the vertically supporting shaft portion of the movable stopper main body 71 is inserted into the vertically extending through hole of the front bracket 53 from below. With the inner fitting inserted, the plate-like member 72 is fitted and fixed from above to the upper end of the support shaft portion of the upper receiving portion 71A. As a result, the front movable stopper 70 can be supported by the front bracket 53 so as to be rotatable around the vertical axis d.

  Thereby, the front movable stopper 70 swings outward around the vertical axis d and receives and supports the seedlings G placed on the intermediate and lower preliminary seedling platforms 20m, 20d (movement of the seedling G). And a non-acting posture that swings inwardly around the vertical axis d and is in a state along the front-rear direction and cannot receive and support the seedling G (allows movement of the seedling G). The posture can be changed.

  As shown in FIG. 7, in the action posture of the front movable stopper 70, the front portion is formed so that an open portion 70 </ b> A with the front and rear opened is formed between the upper receiving portion 71 </ b> A and the lower receiving portion 71 </ b> B. Since the movable stopper 70 is formed in a U-shape, the seedling G is replenished from the front to the lower preliminary seedling stage 20d through the opening 70A while the front movable stopper 70 is in the acting posture. Can do.

  This makes it difficult for the front movable stopper 70 to obstruct the supply of the seedling G from the front to the lower stage seedling stage 20d, and the front movable stopper 70 places it on the middle and lower stage preliminary seedling stages 20m and 20d. While preventing the placed seedling G from falling forward, the seedling G can be replenished from the front without difficulty on the lower preliminary seedling stage 20d.

  As shown in FIGS. 5 and 18, a front arm member 71a is fixed to the upper portion of the support portion of the movable stopper body 71, and a front end portion of an interlocking rod 85 described later is attached to the front arm member 71a. It is linked.

  As shown in FIGS. 5 to 7 and FIG. 18, a U-shaped rear bracket 54 having a longitudinal sectional shape opened rearward in a side view is formed at the rear portion of the first frame member 30 of the intermediate preliminary seedling stage 20 m. Is fixed. The rear bracket 54 is formed with a vertical through hole, and a rear movable stopper 80 is supported in the through hole so as to be swingable around a vertical axis e.

  The rear movable stopper 80 includes a movable stopper main body 81, a plate-like member 82, a positioning pin 83, and an elastic spring 84. The movable stopper main body 81 of the rear movable stopper 80 is formed by bending a round bar, and an upper receiving portion 81A for receiving and supporting the seedling G placed on the upper preliminary seedling placing base 20u is formed on the upper portion thereof, A lower receiving portion 81B for receiving and supporting the seedling G placed on the middle stage preliminary seedling placing stand 20m is formed at the lower portion thereof, and the outer shape in front view in the action posture described later is opened outward. It is shaped into a shape.

  The vertically supporting shaft portion of the movable stopper body 81 is inserted into the vertically extending through hole of the rear bracket 54. In this state, the lower end of the supporting shaft portion of the movable stopper body 81 and the end of the lower receiving portion 81B are inserted. The plate-like member 82 is fixed over the part. As a result, the rear movable stopper 80 can be supported by the rear bracket 54 so as to be rotatable around the vertical axis e.

  Thereby, the rear movable stopper 80 swings outward around the vertical axis e and can receive and support the seedlings G placed on the upper and middle preliminary seedling platforms 20u and 20m, The posture is changeable to a non-working posture that swings inwardly around a downward axis e and is in a state along the front-rear direction.

  A vertical positioning pin 83 is fixed to the plate-like member 82. The lower portion of the rear bracket 54 is formed with first and second positioning holes 54a and 54b into which the upper end of the positioning pin 83 enters from the lower side, and the first and second positioning holes 54a and 54b are shafts facing upward and downward. It is formed on the same circumference around the center e. An elastic spring 84 is provided over the movable stopper main body 81 and the upper surface side of the rear bracket 54, and the rear movable stopper 80 is moved upward by the elastic spring 84 (the positioning pin 83 has the first or second positioning holes 54 a and 54 b. It is energized by the side that enters.

  As a result, the rear movable stopper 80 is pushed downward against the biasing force of the elastic spring 84 and the positioning pin 83 comes out of the first or second positioning holes 54a, 54b. Oscillation around the axis e is allowed. Then, by engaging the positioning pin 53 into the first or second positioning holes 54a and 54b by the biasing force of the elastic spring 84, the rear movable stopper 80 cannot swing around the vertical axis e. .

  As shown in FIG. 7, in the action posture of the rear movable stopper 80, the rear movable stopper is formed between the upper receiving portion 81A and the lower receiving portion 81B so as to form an open portion 80A open front and rear. Since the shape of 80 is formed in a U-shape, the seedling G can be taken out from the preliminary seedling placing stand 20m in the middle stage through the opening 80A with the rear movable stopper 80 in the acting posture.

  This makes it difficult for the rear movable stopper 80 to prevent the rear seedling G from being taken out from the middle stage preliminary seedling platform 20m, and the seedlings placed on the upper and middle preliminary seedling platforms 20u and 20m by the rear movable stopper 80. While preventing G from falling backward, the seedling G can be taken out rearwardly from the middle stage seedling stage 20m.

  As shown in FIGS. 5 and 18, the rear end (one end) of the interlocking rod 85 is linked to the lower end of the positioning pin 83 of the rear movable stopper 80, and the front end (others) of the interlocking rod 85 is connected. A front arm member 71a fixed to the front movable stopper 70 is linked to the end portion. As a result, the front and rear movable stoppers 70 and 80 are mechanically linked, and an interlocking mechanism that interlocks and connects the front and rear movable stoppers 70 and 80 is configured.

  The rear movable stopper 80 is swung in a state where the rear movable stopper 80 is pushed downwards against the urging force of the elastic spring 84 to allow the rear movable stopper 80 to swing about the vertical axis e. As a result, the operation of the rear movable stopper 80 is transmitted to the front movable stopper 70 via the interlocking rod 85, and the front movable stopper 70 swings in conjunction with the rear movable stopper 80.

  When the position of the positioning pin 83 is positioned at the position of the first positioning hole 54a, and the positioning pin 83 is engaged with the first positioning hole 54a by the biasing force of the elastic spring 84, the rear movable stopper 80 is rotated around the vertical axis e. The rear movable stopper 80 is held in a state in which the posture is changed to the action posture. In this case, the interlocking rod 85 makes it impossible for the front movable stopper 70 to swing about the vertical axis d, so that the front movable stopper 70 is also held in a state in which the posture has been changed to the action posture.

  On the other hand, when the position of the positioning pin 83 is positioned at the position of the second positioning hole 54b and the positioning pin 83 is engaged with the second positioning hole 54b by the biasing force of the elastic spring, the vertical axis e of the rear movable stopper 80 is set. Swinging around becomes impossible, and the rear movable stopper 80 is held in a state in which the posture is changed to the non-operation posture. In this case, the interlocking rod 85 makes it impossible for the front movable stopper 70 to swing about the vertical axis d, so that the front movable stopper 70 is also held in a non-acting posture.

  In this way, the front movable stopper 70 is configured so that the posture is changed in conjunction with the change in the posture of the rear movable stopper 80, so that the front seedling placement unit F can be moved forward from the rear side (driver seat 12 side). The posture of the front and rear movable stoppers 70 and 80 can be changed quickly and easily.

  Although not shown, the rear movable stopper 80 is interlocked with the posture change of the front movable stopper 70 by adopting, for example, front and rear movable stoppers (not shown) symmetrical to this embodiment. May be configured such that the posture is changed. Thereby, the posture of the front and rear movable stoppers 70 and 80 can be easily and quickly changed from the front side of the preliminary seedling placement portion F.

  Although not shown, for example, the front movable stopper 70 is configured to change its posture in conjunction with the posture change of the rear movable stopper 80, and the rear portion is linked to the posture change of the front movable stopper 70. The movable stopper 80 may be configured to change its posture. Accordingly, the posture of the front and rear movable stoppers 70 and 80 can be easily and quickly changed from both the front side and the rear side of the preliminary seedling placement unit F according to the work mode.

[Status switching status of spare seedling placement section]
The state switching state of the preliminary seedling placement unit F will be described with reference to FIGS. 5, 7, 8, 10, and 19. FIG. 19 is a longitudinal side view of the preliminary seedling placement unit F in the unfolded state. As shown in FIGS. 5 and 8, with the front and rear movable stoppers 70, 80 changed to the non-operating posture, the lock mechanism 40 is grasped by grasping the operating tool 46 from the overlapping state of the preliminary seedling placement portion F. When the unlocking state is operated and the operation tool 46 is pushed or pulled slightly upward and forward, the first linkage link 61 swings around the left-right axis P1, and the second linkage link 62 becomes the left-right axis. It swings around P4, and the third linkage link 63 swings around the left-right axis P6.

  Then, the left and right axial center P2 of the rear portion of the upper preliminary seedling table 20u moves forward and downward along the rotation locus L1 around the horizontal axis P1, and before and after the upper preliminary seedling table 20u. The center axis P5 moves forward and downward along the rotation locus L2 around the left-right axis P4. Thereby, the upper stage seedling stage 20u moves to the front side of the middle stage seedling stage 20m in a state where the height difference between the front end and the rear end of the upper stage seedling stage 20u is not substantially changed.

  Further, the left and right axial center P3 of the front part of the lower preliminary seedling stage 20d moves rearward and upward along the rotation locus L3 around the horizontal axis P1, and the lower preliminary seedling stage 20d The axial center P7 in the front-rear central portion moves rearward and upward along the rotation locus L4 around the left-right axis P6. Thereby, the lower stage seedling stage 20d moves to the rear side of the middle stage seedling stage 20m in a state where the height difference between the front end and the rear end of the lower stage seedling stage 20d is not substantially changed.

  Then, the second frame member 50 of the upper stage seedling mount 20u is supported by the second support member 38 fixed to the second linkage link 62, and the first, second and third linkage links 61, 62, 63 swing range is regulated. As a result, the upper and lower standby seedling platforms 20u and 20d are substantially aligned with the middle preliminary seedling platform 20m, and the preliminary seedling placement unit F is switched to the unfolded state. In this case, the lock mechanism 40 is automatically operated to the locked state, and the deployed state of the preliminary seedling placement unit F is automatically maintained.

  As a result, when the operation tool 46 is operated forward, one movement of the link mechanism 60 allows the upper and lower standby seedling platforms 20u and 20d to be moved simultaneously via the link mechanism 60. The mounting portion F can be switched from the overlapped state to the expanded state. As a result, the state switching of the spare seedling placement unit F can be performed simply and quickly, and the workability of the state switching operation of the preliminary seedling placement unit F can be improved.

  By switching the preliminary seedling placement part F to the unfolded state, the seedling G is placed on the front part of the preliminary seedling placing base 20u on the front side and the seedling G is pushed slightly rearward by bringing the front part of the machine body closer to the heel etc. The seedling G can be slid and moved rearward on the preliminary seedling platforms 20u, 20m, and 20d, and the seedling G can be moved to the rear of the preliminary seedling placement unit F. The seedling G that has moved to the rear part of the preliminary seedling placement part F is received and supported by the rear fixing stopper 69 provided at the rear part of the rear preliminary seedling stage 20d, and is prevented from falling backward. Thereby, the replenishment of the seedling G from the cocoon or the like at the front of the body to the seedling platform 10 at the rear of the body can be performed efficiently.

  In this case, since the front and rear movable stoppers 70 and 80 are changed to the non-acting postures, the front and rear central seedling mounting bases 20u and the front and rear central preliminary seedling mounting bases 20m and the front and rear central standby stoppers are arranged. There is no seedling stopper between the seedling placing stand 20m and the rear spare seedling placing stand 20d, and the seedling G can be moved rearward without difficulty.

  In addition, when the three seedlings G are placed side by side on the preliminary seedling placement unit F in the unfolded state, the front fixing stopper 68 provided in the front part of the front preliminary seedling stage 20u and the rear spare part are arranged. The seedlings G placed on the preliminary seedling placement part F are received and supported by the rear fixing stopper 69 provided at the rear part of the seedling placing stand 20d, and are prevented from falling off in the front-rear direction.

  When the operation tool 46 is grasped from the deployed state of the preliminary seedling placement portion F to operate the lock mechanism 40 to the unlocked state, and the operation tool 46 is pushed or pulled slightly upward and backward, the first linkage link 61 is directed left and right. The second linkage link 62 is swung about the left-right axis P4, and the third link 63 is swung about the left-right axis P6.

  Then, the left and right axial center P2 of the rear part of the front spare seedling platform 20u moves rearward and upward along the rotation locus L1 around the left and right axial center P1, and before and after the front preliminary seedling platform 20u. The center axis P5 moves rearward and upward along the rotation locus L2 around the left-right axis P4. Thereby, the front side preliminary seedling stage 20u moves to the upper side of the front and rear central preliminary seedling stage 20m in a state where the height difference between the front end and the rear end of the front side preliminary seedling stage 20u is not substantially changed.

  Further, the left and right axial center P3 of the front portion of the rear spare seedling table 20d moves forward and downward along the rotation locus L3 around the left and right axial center P1, and the rear preliminary seedling table is provided. The axis P7 at the front and rear center part of 20d moves forward and downward along the rotation locus L4 around the axis P6 in the left-right direction. As a result, the rear side seedling stage 20d moves to the lower side of the front and rear center preliminary seedling stage 20m in a state where the height difference between the front end and the rear end of the rear side seedling stage 20d is not changed. To do.

  Then, the second frame member 50 of the front spare seedling platform 20u is supported by the first support member 37 fixed to the vertical frame 30d, and the first, second and third linkage links 61, 62, 63 The swing range is restricted. As a result, the upper and lower standby seedling platforms 20u and 20d overlap with the intermediate preliminary seedling platform 20m in a plan view, and the preliminary seedling placement unit F is switched to the overlapping state. In this case, the lock mechanism 40 is automatically operated to the locked state, and the overlapping state of the spare seedling placement unit F is automatically maintained.

  As a result, when the operation tool 46 is operated rearward, the upper and lower standby seedling platforms 20u and 20d can be moved simultaneously via the link mechanism 60 by one movement of the link mechanism 60. The mounting portion F can be switched from the unfolded state to the overlapping state. As a result, the state switching of the spare seedling placement unit F can be performed simply and quickly, and the workability of the state switching operation of the preliminary seedling placement unit F can be improved.

  By switching the preliminary seedling placement part F to the overlapped state and changing the posture of the front and rear movable stoppers 70 and 80 to the working posture, the seedling G placed on the preliminary seedling placement part F becomes the front part and the rear part. The seedlings G are received and supported by the movable stoppers 70 and 80, and the seedling G is fed from the rear part of the upper preliminary seedling stage 20u, the front and rear parts of the middle preliminary seedling stage 20m, and the front part of the lower preliminary seedling stage 20d. It is prevented from falling off in the front-rear direction. In this case, the front part of the upper stage seedling stage 20u and the rear part of the lower stage seedling stage 20d are supported by the front and rear fixing stoppers 68 and 69 so that the seedling G is received and supported. Falling out is prevented.

  As shown in FIGS. 8 and 19, the preliminary seedling stage 20u moves substantially in parallel along the rotation trajectories L1 and L2 without substantially changing the height difference between the front end portion and the rear end part of the preliminary seedling stage 20u. . Thereby, when switching the state of the preliminary seedling placement unit F, the lower end of the rear end of the seedling receiving body 31u in the preliminary seedling stage 20u moves as shown by the rotation locus L5 in FIG. The lower part is less likely to interfere with the front upper part of the seedling G placed on the preliminary seedling stage 20m.

  Similarly, the preliminary seedling stage 20d moves substantially in parallel along the rotation trajectories L3 and L4 without substantially changing the height difference between the front end portion and the rear end part of the preliminary seedling stage 20d. As a result, when the state of the preliminary seedling placement unit F is switched, the upper end of the front end of the seedling G placed on the preliminary seedling placement base 20d moves as indicated by the rotation locus L6 in FIG. 19 and is placed on the preliminary seedling placement base 20d. The placed seedling G is less likely to interfere with the lower rear portion of the spare seedling mount 20m.

  Thereby, even if it does not take out the seedling G from the preliminary seedling placement part F, the state of the preliminary seedling placement part F can be switched while the seedling G is placed on the preliminary seedling placement part F. The workability of the state switching operation of the seedling placement unit F can be improved.

  As shown in FIG. 8, in the case where the spare seedling placement unit F is switched from the overlapped state to the deployed state, the upper preliminary seedling placing base 20u rises to the intermediate state shown by the two-dot chain line in FIG. The seedling mount 20d is lowered to an intermediate state indicated by a two-dot chain line in FIG. Therefore, the lower preliminary seedling stage 20d is lowered by its own weight (including the weight of the seedling G when the seedling G is placed) into the intermediate state, and the upper preliminary seedling stage 20d is linked via the link mechanism 60. It acts as a force that raises the stage 20u (including the seedling G when the seedling G is placed) to an intermediate state and is easily offset, and the moments around the axis P1 acting by these forces are balanced. It becomes easy.

  The upper preliminary seedling stage 20u is lowered from the intermediate state shown by the two-dot chain line in FIG. 8, and the lower preliminary seedling stage 20d is raised from the intermediate state shown by the two-dot chain line in FIG. For this reason, the lower preliminary seedling 20u has a force that the upper preliminary seedling platform 20u descends from the intermediate state by its own weight (including the weight of the seedling G when the seedling G is placed) via the link mechanism 60. It acts as a force that raises the platform 20d (including the seedling G when the seedling G is placed) and is easily offset, and the moment around the axis P1 acting by these forces is easily balanced.

  Further, when the preliminary seedling placement unit F is switched from the expanded state to the overlapped state, the front side preliminary seedling stage 20u rises to an intermediate state indicated by a two-dot chain line in FIG. 8, and the rear side preliminary seedling stage 20d. Falls to an intermediate state indicated by a two-dot chain line in FIG. For this reason, the force that the rear spare seedling platform 20d lowers to its intermediate state by its own weight (including the weight of the seedling G when the seedling G is placed) is applied via the link mechanism 60 to the front spare seedling table 20d. It acts as a force that raises the seedling mount 20u to an intermediate state and is easily offset, and the moment around the axis P1 that acts by these forces is easily balanced.

  The front spare seedling stage 20u is lowered from the intermediate state shown by the two-dot chain line in FIG. 8, and the rear preliminary seedling stage 20d is raised from the intermediate state shown by the two-dot chain line in FIG. Therefore, the force that the front spare seedling table 20u lowers from the intermediate state by its own weight (including the weight of the seedling G when the seedling G is placed) is connected via the link mechanism 60 to the rear side spare seedling base 20u. It acts as a force that raises the seedling placing table 20d (including the seedling G when the seedling G is placed) and is easily offset, and the moment around the axis P1 acting by these forces is easily balanced. .

  In addition, in the intermediate state of the reserve seedling platforms 20u and 20d shown by the two-dot chain line in FIG. 8, the first, second and third linkage links 61, 62 and 63 of the link mechanism 60 are directed upward and downward. The preliminary seedling stage 20u is supported from the lower side by the link mechanism 60, and the lower preliminary seedling stage 20d is supported from the upper side by the link mechanism 60.

  As a result, even if the operating tool 46 is not pushed and pulled with a large operating force, the operating tool 46 can be operated with a small operating force to switch the state of the spare seedling placement unit F. The state can be easily switched. Further, for example, even if the hand is released from the operation tool 46 while the state of the spare seedling placement unit F is being switched, the upper and lower preliminary seedling placement bases 20u after the hand is released from the operation tool 46. , 20d will not rise or fall suddenly. Thereby, damage to the preliminary seedling placement part F can be prevented.

  When the preliminary seedling placement unit F is switched from the overlapping state to the deployed state, the upper preliminary seedling platform 20u is deployed forward and downward, and the lower preliminary seedling platform 20d is deployed rearward and upward. Therefore, the upper stage seedling stage 20u can be moved back and forth at a high position. Accordingly, even when an obstacle such as a cocoon is present in front of the lower portion of the preliminary seedling placement unit F, the preliminary seedling placement unit F can be easily switched from the overlapped state to the expanded state, and The situation in which the state of the mounting portion F is switched can be easily seen by a work assistant such as a bag.

  As shown in FIGS. 8 and 19, the preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 20 u expands forward and downward and the lower preliminary seedling stage 20 d expands rearward and upward. Is located at the front upper side of the second linkage link 62 in the deployed state, and the spare seedling placement portion F is located on the lower side of the front portion of the third linkage link 63 in the deployed state. The rear portion of the link 61 is positioned.

  Thereby, the rear part of the front side seedling stand 20u is positioned higher than the front part of the front and rear center seedling stage 20m with the first and second link links 61, 62 having a simple linear shape. The first and third linkage links 61 and 63 having a simple linear shape can position the front portion of the rear side seedling support table 20d at a position lower than the rear part of the front and rear center seedling support table 20m. be able to. As a result, a level difference h1 between the front side preliminary seedling stage 20u and the front and rear center preliminary seedling stage 20m and a level difference h2 between the front and rear center preliminary seedling stage 20m and the rear side preliminary seedling stage 20d are obtained. It can be formed easily.

  As shown in FIG. 19, in the unfolded state of the preliminary seedling placement unit F, the seedling placement surface 31A at the rear of the front preliminary seedling placement stand 20u and the seedling placement surface 31A at the front of the front and rear central seedling placement stand 20m. A predetermined level difference h1 is formed between the front and rear center seedling placing bases 20m and a rear seedling placing surface 31A on the rear side and the rear seedling placing base 20d front side. The heights of the front and rear spare seedling platforms 20u and 20d with respect to the front and rear central seedling platforms 20m in the deployed state are set so that the step h2 is formed.

  In addition, the seedling placement surface 31A of the front and rear center seedling placing stand 20m is disposed obliquely so as to incline downward and rearward by the first predetermined angle θ1 with respect to a horizontal plane substantially parallel to the rice field. The seedling placing surface 31A of the seedling placing stand 20u is disposed obliquely so as to be inclined downward and rearward by the second predetermined angle θ2 with respect to a horizontal plane substantially parallel to the rice field, and the rear seedling placing stand 20d The seedling placement surface 31A is disposed obliquely so as to be inclined downward and rearward at the third predetermined angle θ3 with respect to a horizontal plane substantially parallel to the rice field.

  The second predetermined angle θ2 is set to be larger than the first predetermined angle θ1. As a result, the seedling G placed on the front portion of the preliminary seedling placing stand 20u on the front side can be moved rearward with a momentum at the second predetermined angle θ2.

  The third predetermined angle θ3 is set to be larger than the first predetermined angle θ1. Accordingly, the seedling G that has moved from the front side preliminary seedling stage 20u to the rear side preliminary seedling stage 20d is prevented from being stopped in the middle of the rear side preliminary seedling stage 20d while preventing the seedling G from stopping in the middle of the rear side preliminary seedling stage 20d. By the angle θ3, it can be moved to the rear part of the rear seedling stand 20d without difficulty.

  As a result, the seedling G placed on the front part of the preliminary seedling stage 20u on the front side from the heel or the like on the front side of the body is slid on the preliminary seedling stage 20u, 20m, 20d, and the rear side seedling stage is placed. It can be moved to the rear of the platform 20d without difficulty.

  As shown in FIG. 7, in the overlapping state of the preliminary seedling placement unit F, the upper preliminary seedling stage 20u is changed from the use position to the standing position, and the middle preliminary seedling stage 20m is changed from the use position to the standing position. By changing the posture, and changing the posture of the lower stage seedling platform 20d from the usage posture to the standing posture, the preliminary seedling platforms 20u, 20m, and 20d in the upper and lower stages with the spare seedling placement unit F overlapped with each other Can be stored compactly inside.

  As shown in FIGS. 3 and 10, in the deployed state of the spare seedling placement unit F, the front side seedling placing stand 20 u is changed from the use posture to the standing posture, and the front and rear center spare seedling stand 20 m is used. The posture is changed from the standing posture to the standing posture, and the rear spare seedling platform 20d is changed from the usage posture to the standing posture, so that the preliminary seedling placement unit F is expanded to the three preliminary seedling loading platforms 20u and 20m. , 20d can be stored compactly inside the fuselage. In this case, it is also possible to change the posture of the preliminary seedling platforms 20u, 20m, and 20d to the standing posture in a different order.

  That is, the preliminary seedling placement part F can be stored compactly inside the machine body in both the overlapping state and the deployed state of the preliminary seedling placement part F. Thus, for example, when the riding type rice transplanter is stored in a warehouse or the like, or when the riding type rice transplanter is loaded on a truck bed (not shown), the spare seedling placement unit F is switched to the overlapped state. By changing the posture of the seedling stand 20 to the standing posture, the overall length of the aircraft and the overall width of the aircraft can be shortened, and the riding type rice transplanter can be stored and loaded in a compact manner. For example, when the riding type rice transplanter is driven on a relatively narrow road such as a narrow path, the position of the preliminary seedling platform 20 is changed to the standing posture while the preliminary seedling placement unit F is in the unfolded state. Thus, it is possible to change the entire width of the machine body simply and quickly, and to drive the riding type rice transplanter on a relatively narrow road such as a narrow road.

[Second Reference Form]
In the above-mentioned [first reference embodiment] , the intermediate stage seedling stage 20m is fixed to the support frame 19 side, the upper stage seedling stage 20u is developed on the front side, and the lower stage seedling stage 20d is on the rear side. The example is shown in which the preliminary seedling placement unit F is configured so as to expand to the upper side, but the upper preliminary seedling placement base 20u is arranged on the rear side with respect to the middle preliminary seedling placement base 20m fixed to the support frame 19 side. The preliminary seedling placement unit F may be configured such that the lower preliminary seedling stage 20d is deployed to the front side. In this case, the height of the spare seedling platform 20u developed on the rear side is set lower than the height of the front and rear central seedling platform 20m, and the height of the spare seedling platform 20d deployed on the front side is set to the height of the front and rear central seedlings. You may set higher than the height of the mounting base 20m.

In the above-mentioned [first reference form] , the intermediate stage seedling stage 20m is fixed to the support frame 19 side, and the upper stage seedling stage 20u is developed to the front side via the link mechanism 60, and the lower stage seedling stage 20u. Although an example in which the preliminary seedling placement unit F is configured so that the seedling placement base 20d is deployed on the rear side is shown, a different spare seedling placement base 20 among the plurality of preliminary seedling placement bases 20 is arranged on the support frame 19 side. The preliminary seedling placement unit F may be configured such that the preliminary seedling stage 20 other than the fixed seedling base 20 fixed on the support frame 19 side is deployed via the link mechanism 60. Hereinafter, an example will be described with reference to FIG. FIG. 20 is a schematic side view of the preliminary seedling placement unit F in the [second reference embodiment] .

  As shown in FIG. 20 (a), the lower preliminary seedling platform 20 d is fixed to the support frame 19, and the upper and middle preliminary seedling platforms 20 u and 20 m are connected to the lower preliminary seedling platform via the link mechanism 60. It is linked to 20d. Then, as shown by a two-dot chain line in FIG. 20 (a), the preliminary seedling placement section is arranged such that the upper and middle preliminary seedling placement bases 20u and 20m are deployed forward relative to the lower preliminary seedling placement base 20d. F is configured. In this case, in the preliminary seedling placement portion F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d is set to gradually decrease toward the rear side.

  Although not shown in the drawing, the preliminary seedling placement unit F is arranged so that the upper and middle preliminary seedling mounting bases 20u and 20m are deployed rearward with respect to the lower preliminary seedling mounting base 20d fixed to the support frame 19 side. May be configured. In this case, in the preliminary seedling placement section F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d may be set so as to gradually decrease toward the rear side.

  As shown in FIG. 20 (b), the upper preliminary seedling stage 20 u is fixed to the support frame 19, and the middle and lower preliminary seedling bases 20 m and 20 d are connected to the upper preliminary seedling stage via the link mechanism 60. It is linked to 20u. Then, as shown by the two-dot chain line in FIG. 20 (b), the preliminary seedling placement is such that the middle and lower preliminary seedling placement stands 20m, 20d are deployed rearward with respect to the upper preliminary seedling placement stand 20u. Part F is configured. In this case, in the preliminary seedling placement portion F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d is set to gradually decrease toward the rear side.

  Further, although not shown in the drawing, the preliminary seedling placement unit F is arranged so that the middle and lower preliminary seedling mounting bases 20m and 20d are deployed forward with respect to the upper preliminary seedling mounting base 20u fixed to the support frame 19 side. It may be configured. In this case, in the preliminary seedling placement section F in the unfolded state, the height of the preliminary seedling placement bases 20u, 20m, and 20d may be set so as to gradually decrease toward the rear side.

[Third Reference Form]
In the above-mentioned [first reference form] and [second reference form] , an example in which the preliminary seedling placement unit F in an overlapping state is configured by including the upper and lower three-stage preliminary seedling mounting bases 20u, 20m, and 20d. However, a plurality of different stages (two stages, four stages or more) of the spare seedling placing bases 20 may be provided to constitute the spare seedling placing unit F in an overlapping state. Further, in the above-mentioned [first reference form] and [second reference form] , an example in which the middle stage seedling placing base 20m is fixed to the support frame 19 side is shown, but the link mechanism 360 is attached to the support frame 19 side. You may comprise the preliminary seedling mounting part F so that it may fix to. Hereinafter, an example will be described with reference to FIG. FIG. 21 is a schematic side view of the preliminary seedling placement unit F in the [third reference embodiment] .

  As shown in FIG. 21 (a), a preliminary seedling placement section F in an overlapped state is configured by including two stages of the upper and lower preliminary seedling platforms 120u and 120d. The lower preliminary seedling stage 120d is fixed to the support frame 19 side, and the upper preliminary seedling stage 120u is connected to the lower preliminary seedling stage 120d and the link mechanism 160 (the front link 161 and the rear link 162). Linked together. The preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 120u is deployed to the front side with respect to the lower preliminary seedling stage 120d fixed to the support frame 19 side. In this case, the height of the preliminary seedling stage 120u developed on the front side is set to be higher than the height of the preliminary seedling stage 120d fixed to the support frame 19 side.

  In addition, although not shown, the preliminary seedling placement unit F is configured so that the upper preliminary seedling stage 120u expands to the rear side with respect to the lower preliminary seedling stage 120d fixed to the support frame 19 side. The upper preliminary seedling stage 120u is fixed to the support frame 19 side, and the lower preliminary seedling stage 120d is arranged on the front side or the rear side with respect to the upper preliminary seedling stage 120u fixed to the support frame 19 side. The preliminary seedling placement unit F may be configured to expand to

  As shown in FIG. 21 (b), the preliminary seedling placement section F in an overlapped state is configured with four stages of the upper and lower preliminary seedling placement bases 220v, 220u, 220m, and 220d. The second preliminary seedling stand 220m from the bottom is fixed to the support frame 19 side, and the other spare seedling bases 220v, 220u, 220d are connected to the second preliminary seedling stand 220m from the bottom and the link mechanism 260 (linkage link). 261, 262, 263, 264). Then, with respect to the preliminary seedling stage 220m fixed to the support frame 19, the preliminary seedling bases 220v and 220u above the preliminary seedling stage 220m are deployed to the front side, and the preliminary seedling stage 220m below the preliminary seedling stage 220m is reserved. The preliminary seedling placement portion F is configured so that the seedling placement stand 220d is deployed on the rear side. In this case, in the preliminary seedling placement unit F in the unfolded state, the heights of the preliminary seedling placement bases 220v, 220u, 220m, and 220d are set to gradually decrease toward the rear side.

  Further, although not shown in the drawing, any one of the four different upper and lower four-stage standby seedling platforms 220v, 220u, 220m, 220d is fixed to the support frame 19 side to fix the preliminary seedling platforms 220v, 220u, 220d. The placement unit F may be configured. In this case, when the second reserve seedling stand 220u from the top is fixed to the support frame 19, the preliminary seedling stand 220v on the upper side of the preliminary seedling stand 220u is deployed to the front side or the rear side, and the preliminary seedling stand is placed. You may comprise so that the preliminary | backup seedling stand 220m, 220d of the lower side of the stand 220u expand | deploys to the back side or the front side. In addition, when the uppermost preliminary seedling stage 220v is fixed to the support frame 19, the preliminary seedling stage 220u, 220m, and 220d other than the preliminary seedling stage 220v are configured to be deployed on the front side or the rear side. Alternatively, when the lowermost preliminary seedling table 220d is fixed to the support frame 19, the preliminary seedling platforms 220v, 220u, and 220m other than the preliminary seedling table 220d are deployed to the front side or the rear side. It may be configured.

  As shown in FIG. 21 (c), the upper and lower two-stage preliminary seedling platforms 320u and 320d are provided, and the preliminary seedling mounting unit F in the overlapping state is configured. 320d are linked and linked via a link mechanism 360 (linkage links 361, 362). The preliminary seedling mounts 320u and 320d are not fixed to the support frame 19 side, and the lower part of the linkage link 361 of the link mechanism 360 is supported on the upper part of the support frame 19 so as to be swingable around a left-right axis. Yes. Then, when the support frame 19 is swung forward, the preliminary seedling placement portion F is configured so that the upper and lower preliminary seedling placement bases 320u and 320d are deployed to the front side.

  In this case, the lower part of the lower preliminary seedling table 320d is in contact with the front and rear stoppers 19a, 19b fixed to the support frame 19, and the preliminary seedling mounting part F is positioned and supported in the expanded state and the overlapping state. Is done. The spare seedling placement portion F is positioned and supported in the deployed state and the overlapped state by bringing a part of the link mechanism 360 (for example, the linkage link 361) into contact with the front and rear stoppers 19a and 19b. May be. In addition, although not shown, a preliminary seedling placement base F is provided with three or more stages of preliminary seedling placement bases, and a link mechanism that interlocks and connects the preliminary seedling placement bases is supported swingably on the support frame 19 side. Thus, you may comprise the preliminary seedling mounting part F.

In the above-mentioned [first reference form] and [second reference form] , one of the preliminary seedling placing bases 20u, 20m, and 20d in the upper and lower three-stage preliminary seedling placing bases F is overlapped. The preliminary seedling placement unit is configured such that the stage 20 is fixed to the support frame 19 side, and the preliminary seedling stage 20 other than the preliminary seedling stage 20 fixed to the support frame 19 side is deployed in the deployed state on the front side or the rear side. Although the example which comprised F was shown, in the overlapping state of the preliminary seedling mounting part F, two preliminary seedling mounting bases 20 of upper and lower three-stage preliminary seedling mounting bases 20u, 20m, and 20d are placed on the support frame 19 side. Any one of the preliminary seedling table 20 fixed and fixed to the support frame 19 side and the preliminary seedling table 20 not fixed to the support frame 19 side are linked together via a link mechanism, and the support frame 19 For the preliminary seedling stand 20 fixed to the side , Preliminary seedling table 20 which is not fixed to the support frame 19 side so as to expand the deployed state to the front or rear, may constitute a pre Naeno portion F.

  Specifically, for example, among the upper and lower three-stage reserve seedling platforms 20u, 20m, and 20d in an overlapped state, the middle and lower reserve seedling platforms 20m and 20d are fixed to the support frame 19 side, and the middle stage reserve seedlings are placed. The platform 20m and the upper preliminary seedling platform 20u are linked and linked by a link mechanism. Then, the preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 20u expands to the front side or the rear side with respect to the middle preliminary seedling stage 20m fixed to the support frame 19 side.

  Further, although not shown in the figure, when a plurality of different stages (four or more) of spare seedling platforms are provided and the spare seedling placement unit F in the overlapping state is configured, similarly, a plurality of spare seedling units in the overlapping state are provided. A plurality of preliminary seedling platforms among the seedling platforms are fixed to the support frame 19 side, and any one of the plurality of preliminary seedling platforms fixed to the support frame 19 side is fixed to the support frame 19 side. The spare seedling platform that is not fixed to the support frame 19 side is on the front side or the rear side with respect to the preliminary seedling platform that is connected to the other support seedling platform by the link mechanism and fixed to the support frame 19 side. You may comprise the preliminary seedling mounting part F so that it may expand | deploy.

  Specifically, for example, the second and lowermost preliminary seedling platforms 220m, 220d from the bottom of the four upper and lower preliminary seedling platforms 220v, 220u, 220m, 220d in the overlapping state are fixed to the support frame 19 side. The second preliminary seedling platform 220m from the bottom and the uppermost and upper preliminary seedling platforms 220v and 220u are linked and linked by a link mechanism. Then, with respect to the second preliminary seedling stage 220m fixed from the bottom of the support frame 19, the preliminary seedling stage is placed so that the uppermost and upper stage preliminary seedling stages 220v and 220u are deployed on the front side or the rear side. Part F is configured.

[Fourth Reference Form]
Instead of the front and rear movable stoppers 70 and 80 in [First Reference Embodiment] , different shapes and structures of the front and rear movable stoppers may be employed. Hereinafter, an example thereof will be described with reference to FIG. FIG. 22 is a side view of the vicinity of the front movable stoppers 170, 270, and 370 in the [fourth embodiment] . In the following description, the front movable stoppers 170, 270, and 370 are shown as examples, but the rear movable stoppers 180, 280, and 380 can have the same shape and structure.

  As shown in FIG. 22A, the movable stopper main body 171 of the front movable stopper 170 is formed with an intermediate receiving portion 171C in addition to the upper and lower receiving portions 171A and 171B. An open portion 170A is formed on the upper side and the lower side of the intermediate portion receiving portion 171C, and the shape of the front movable stopper 171 is configured in an E shape. Thereby, for example, the front part of the seedling G placed on the upper and lower three-stage preliminary seedling stage can be received and supported by the upper receiving part 171A, the intermediate receiving part 171C, and the lower receiving part 171B.

  As shown in FIG. 22B, the movable stopper main body 271 of the front movable stopper 270 includes a support rod 271a supported so as to be rotatable about the vertical axis of the front bracket 53, and the support rod 271a. The upper and lower receiving portions 271A, 271B are fixed to the upper and lower portions of the vertical plate. Then, receiving surfaces 271D and 271E for receiving the seedling G are formed on the upper and lower receiving portions 271A and 271B, and an open portion 270A is formed between the upper and lower receiving portions 271A and 271B. Accordingly, the seedling G can be stably received on the surface, and the structure of the front movable stopper 170 can be simplified.

  As shown in FIG. 22 (c), the movable stopper main body 371 of the front movable stopper 370 includes a first rod 371a supported so as to be rotatable about the vertical axis of the front bracket 53, and the first rod 371a. And a second rod 371b fixed to the upper portion of the rod 371a. The first and second rods 371a and 371b are formed with upper and lower receiving portions 371A and 371B facing upward, and an open portion 370A is formed between the first and second rods 371a and 371b. . Thereby, the seedling G can be efficiently received in the shape of an upward and downward line, and the structure of the front movable stopper 370 can be simplified.

In the above-mentioned [first reference embodiment] , the front movable stopper 70 supports the seedlings G placed on the middle and lower preliminary seedling platforms 20m and 20d, and the rear movable stopper 80 supports the upper and lower preliminary seedlings. Although an example in which the seedlings G placed on the platforms 20u and 20d are supported is shown, the front and rear movable stoppers 70 and 80 may be configured to support different numbers of seedlings G. . Specifically, for example, one of the front and rear movable stoppers 70 and 80 supports the seedling G placed on one preliminary seedling stage 20, and the other of the front and rear movable stoppers 70 and 80 has a plurality. You may comprise so that the seedling G mounted in the preliminary seedling mounting stand (for example, 2 steps | paragraphs of upper and lower sides) may be supported.

[Fifth Reference Form]
In the above-mentioned [first reference embodiment] and [fourth reference embodiment] , the front and rear movable stoppers 70, 170, 270, 370, 80, 180, 280, 380 are replaced with the front or rear brackets 53, 54. In the above example, the front and rear movable stoppers are supported by other than the front and rear brackets 53, 54. You may employ | adopt the structure which supports a rear part movable stopper so that rotation is possible around the axis center facing left and right. Hereinafter, an example thereof will be described with reference to FIG. FIG. 23 is a detailed view of the vicinity of the front movable stopper 470 in the [fifth reference embodiment] .

  As shown in FIGS. 23A and 23B, the front movable stopper 470 includes a movable stopper main body 471, a shaft member 472, and a bearing member 473. A shaft member 472 is supported at the front lower portion of the seedling receiver 31 in the preliminary seedling mount 20 so as to be rotatable around a left-right axial center via left and right bearing members 473. A movable stopper main body 471 is fixed.

  As a result, the movable stopper body 471 is supported by the lower front portion of the seedling receiver 31 so as to be rotatable around an axis extending in the left-right direction, and the receiving portion 471a of the movable stopper body 471 stands up and the seedling receiver 31 is placed on the seedling. An action posture positioned above the placement surface 31A (a solid line posture in FIG. 23) and a non-action posture located below the seedling placement surface 31A of the seedling receiving body 31 when the receiving portion 471a of the movable stopper body 471 falls down. The front movable stopper 470 is configured so that the posture can be changed to (the posture of the two-dot chain line in FIG. 23).

  A rear movable stopper 480 is attached to the rear lower portion of the seedling receiver 31 in the preliminary seedling mount 20 with the same structure as the front movable stopper 470. The front movable stopper 470, the rear movable stopper 480, and the like. However, they are mechanically interlocked and connected by an interlocking mechanism (not shown) composed of an interlocking rod, for example. Thus, when one of the front and rear movable stoppers 470 and 480 is changed in posture, the other of the front and rear movable stoppers 470 and 480 is changed in posture to the same posture.

  By configuring the front and rear movable stoppers 470 and 480 as described above, the front and rear movable stoppers 470 and 480 can be configured to change the posture between the active posture and the non-active posture, and the front end of the seedling receiver 31 is configured. The front and rear end portions can be effectively reinforced by the front and rear movable stoppers 470 and 480.

Hereinafter, embodiments of the present invention will be described. In this case, in the embodiment of the present invention, portions different from the first to fifth reference embodiments described above are described, and other portions are the same as those of the first to fifth reference embodiments.
Embodiment of the present invention
In the above-mentioned [first reference embodiment] , fixed front and rear fixing stoppers 68 and 69 are provided at the front part of the upper preliminary seedling stage 20u and the rear part of the lower preliminary seedling stage 20d, Although an example in which movable front and rear movable stoppers 70 and 80 are installed in places other than these is shown, in the embodiment of the present invention , a fixed seedling stopper and a movable seedling stopper are provided. The structure arrange | positioned in the different position of the preliminary seedling stand 20 is employ | adopted. The configuration will be described below with reference to FIG. FIG. 24 is a schematic side view of the preliminary seedling placement portion F in this [embodiment of the present invention] .

  As shown in FIG. 24 (a), a fixed front fixing stopper 68 is provided at the front part of the upper stage seedling stage 20u and the front part of the middle stage seedling stage 20m. The front and rear portions of the preliminary seedling stage 20d are equipped with fixed front and rear fixing stoppers 68 and 69, respectively. A rear movable stopper 80 is provided at the rear of the middle stage seedling stage 20m, and the rear movable stopper 80 allows the upper stage and middle stage seedling stage 20u, 20m in the overlapping state from the rear part. It is comprised so that omission of seedling G can be prevented.

  As shown in FIG. 24 (b), when the preliminary seedling placement unit F is switched from the overlapped state to the expanded state, the rear end lower part of the seedling receiving body 31u of the front preliminary seedling placing base 20u is placed on the front and rear central spare seedling placements. The upper end of the front fixed stopper 68 of the rear seedling placing stand 20d is in contact with the upper end of the front fixing stopper 68 of the stand 20m, and the lower rear end of the seedling receiver 31m of the front and rear central seedling placing stand 20m The preliminary seedling platforms 20u and 20d in the unfolded state are positioned and supported.

In this case, for example, by adopting a configuration in which the first linkage link 61 is supported by the second linkage link 62 in the same manner as in [First Reference Embodiment] described above, the link mechanism 60 causes the front spare seedling platform 20u to be supported. Is configured such that the downward movement of the spare seedling table 20d on the rear side is regulated and the upward movement of the rear seedling table 20d is regulated so that the preliminary seedling platforms 20u and 20d in the deployed state are positioned and supported. Also good.

  As a result, a step h3 is formed between the seedling placement surface 31A of the front spare seedling table 20u and the seedling placement surface 31A of the front and rear central seedling placement table 20m. A step h4 is formed between the placement surface 31A and the seedling placement surface 31A of the rear seedling placement stand 20d.

  The height of the seedling placement surface 31A of the preliminary seedling placing table 20u located on the front side of the step h3 is higher than the height of the upper end of the front fixing stopper 68 of the preliminary seedling placing table 20m located on the rear side of the step h3. The height of the seedling placement surface 31A of the preliminary seedling placing stand 20m positioned on the front side of the step h4 is higher than the height of the upper end of the front fixing stopper 68 of the preliminary seedling placing stand 20d located on the rear side of the step h4. Also gets higher.

  As a result, while simplifying the overall structure of the seedling stopper, the steps h3 and h4 formed between the front and rear preliminary seedling placing bases 20 cause the front part of the preliminary seedling placing part F to the rear part of the preliminary seedling placing part F. The seedling G can be moved without difficulty.

In addition, the structure which forms the level | step difference h3, h4 is applicable also in the preliminary seedling mounting part which switches the some preliminary seedling mounting stand 20 with an overlapping state and an unfolded state by the structure different from this [embodiment of this invention] . Specifically, for example, a foldable spare seedling placement unit that swings and unfolds the upper and lower preliminary seedling placement bases in an overlapping state around the front and rear axis of the middle preliminary seedling placement base ( (Not shown) or, for example, an detachable spare seedling placement part (see FIG. 5) that is attached to the front and rear parts of the middle preliminary seedling stage by removing the upper and lower preliminary seedling stage in the overlapping state from the support frame. The same applies to (not shown).

[First Alternative Embodiment of the Invention]
In the above-mentioned [first reference form] , in the unfolded state of the preliminary seedling placement portion F, steps h1 and h2 are formed between the front and rear preliminary seedling platforms 20u, 20m and 20d, and the front and rear preliminary seedlings are placed. By setting the inclination angle of the seedling placement surface 31A of the bases 20u, 20m, and 20d to the first to third predetermined angles θ1 to θ3, from the heel etc. of the front part of the machine body to the front part of the preliminary seedling placement base 20u on the front side Although an example in which the placed seedling G can be moved to the rear side without difficulty is shown, a different configuration may be adopted as a configuration to move the seedling G to the rear side without difficulty. Hereinafter, an example thereof will be described with reference to FIG. FIG. 25 is a schematic side view of the preliminary seedling placement portion F in this [first alternative embodiment of the invention] .

  As shown in FIG. 25 (a), a roller 90 is supported on the front and rear portions of the preliminary seedling platforms 20u, 20d, and 20m so as to be rotatable around a left and right axis. The roller 90 is disposed such that the upper end thereof is positioned above the seedling placement surface 31A of the seedling receivers 31u, 31m, 31d.

  Further, in the unfolded state of the preliminary seedling placement portion F, a step h5 is formed between the seedling placement surface 31A of the front seedling receiver 31u and the seedling placement surface 31A of the front and rear center seedling receiver 31m. A step h6 is formed between the seedling placement surface 31A of the center seedling receiver 31m and the seedling placement surface 31A of the rear seedling receiver 31d.

  Thereby, in the unfolded state of the preliminary seedling placement portion F, the roller 90 supported by the preliminary seedling placement base 20 reduces the contact resistance of the bottom portion of the seedling G to the seedling placement surface 31A, and further imposes the seedling G. It can be moved to the rear side.

  As shown in FIG. 25 (b), the front part and rear part of the seedling receiving surface 31A of the seedling receiving bodies 31u, 31m, 31d have a large amount of inclination downward and lower than the seedling mounting surface 31A. Inclined portions 31B and 31C are formed. As a result, the seedling G that has moved to the rear part of the front spare seedling stage 20u is moved to the rear side with momentum by the rear inclined part 31C of the seedling receiver 31u and the front inclined part 31B of the seedling receiver 31m. The seedling G that has moved to the rear part of the preliminary seedling stage 20m at the center of the front and rear is given momentum by the rear inclined part 31C of the seedling receiver 31m and the front inclined part 31B of the seedling receiver 31d. Can be moved to the side.

  Further, in the deployed state of the preliminary seedling placement portion F, a step h7 is provided between the rear end of the seedling placement surface 31A of the front seedling receiving body 31u and the front end of the seedling placement surface 31A of the front and rear seedling receiving body 31m. And a step h8 is formed between the rear end of the seedling placement surface 31A of the seedling receiving body 31m at the front and rear center and the front end of the seedling placement surface 31A of the rear seedling receiving body 31d. Has been.

  Thereby, in the unfolded state of the preliminary seedling placement portion F, the seedling G is further rearwardly pushed by the front and rear inclined portions 31B, 31C formed on the seedling placement surface 31A of the seedling receivers 31u, 31m, 31d. Can be moved to.

  Although not shown, the seedling G is moved to the rear side by any one of the steps h1 to h8, the first to third predetermined angles θ1 to θ3, the roller 90, the front and rear inclined portions 31B and 31C described above. The preliminary seedling placement part F may be configured so as to move without difficulty, and any of the steps h1 to h8, the first to third predetermined angles θ1 to θ3, the roller 90, the front and rear inclined parts 31B and 31C. Alternatively, the preliminary seedling placement unit F may be configured so that the seedling G can be easily moved to the rear side by two or more different combinations.

  Further, also in the preliminary seedling placement section that switches the plurality of preliminary seedling placement stands 20 between the overlapped state and the unfolded state with a structure different from that of the above embodiment, the steps h1 to h8, the first to third predetermined angles θ1 to θ3, the rollers 90, or the front and rear inclined portions 31B and 31C can be applied. Specifically, for example, a foldable spare seedling placement unit that swings and unfolds the upper and lower preliminary seedling placement bases in an overlapping state around the front and rear axis of the middle preliminary seedling placement base ( (Not shown) or, for example, an detachable spare seedling placement part (see FIG. 5) that removes the upper and lower preliminary seedling placement bases from the support frame in an overlapped state and fixes them to the front and rear of the intermediate preliminary seedling placement base (see FIG. The same applies to (not shown).

[Second Embodiment of the Invention]
In the above-mentioned [first reference embodiment], [fourth reference embodiment], and [fifth reference embodiment] , the front and rear movable stoppers 70, 80 are mechanically linked by the interlocking rod 85, and the front and Although the example which comprised the interlocking mechanism which interlockedly connects the rear part movable stoppers 70 and 80 was shown, you may employ | adopt a different structure as a structure which connects the front part and the rear part movable stoppers 70 and 80 mechanically. Specifically, although not shown, the front and rear movable stoppers 70 and 80 may be mechanically linked by, for example, a linkage link, a linkage wire (including a push-pull wire), or the like.

[Third Another Embodiment of the Invention]
[First Reference Embodiment], [Second Reference Embodiment], [Third Reference Embodiment], [Fourth Reference Embodiment], [Fifth Reference Embodiment], [First Alternative Embodiment of the Invention], [Invention] In the second embodiment of the embodiment, the example in which the seedling planting device 6 is configured to have a six-row planting specification is shown, but a riding type rice transplanter provided with a seedling planting device (not shown) having a different planting-row specification The same applies to.

[First Reference Embodiment], [Second Reference Embodiment], [Third Reference Embodiment], [Fourth Reference Embodiment], [Fifth Reference Embodiment], [First Alternative Embodiment of the Invention], [Invention] In the second alternative embodiment of the embodiment] and [the third alternative embodiment of the invention] , the spare seedling placement portion F of the riding type rice transplanter has been shown as an example, but the spare seed placement placement portion is different. The same applies to agricultural machines. Specifically, for example, the present invention can be similarly applied to a vegetable transplanting machine in which a plurality of pot seedlings are placed in a tray and placed on a preliminary seedling placement unit.

19 support frame
20 u Preliminary seedling table 20m Preliminary seedling table 20d Preliminary seedling table
60 Link mechanism
68 Stopper
G seedling

Claims (4)

A support frame provided on a lateral side of the machine body, and a plurality of preliminary seedling platforms supported by the support frame via a link mechanism;
By the link mechanism, a plurality of the preliminary seedling platforms are overlapped in a top and bottom multistage and overlapped in plan view, and a plurality of the preliminary seedling platforms are deployed in a straight line in the front-rear direction. A plurality of spare seedling platforms are configured to be switchable,
In the pair of preliminary seedling platforms arranged in the front and rear in the unfolded state, the front portion of the preliminary seedling platform is brought into contact with the rear portion of the preliminary seedling platform on the front side and the front portion of the preliminary seedling platform on the rear side. A farm working machine configured so that a rear part of a stand and a front part of the spare seedling stage on the rear side are positioned relative to each other.   In the pair of preliminary seedling platforms arranged in the front and rear in the deployed state, the rear side of the preliminary seedling platform is not positioned below the front part of the rear preliminary seedling platform. The rear part of the preliminary seedling stage and the front part of the preliminary seedling stage on the rear side are positioned relative to each other by contacting the rear part of the preliminary seedling stage and the front part of the preliminary seedling stage on the rear side. The agricultural machine according to claim 1, which is configured as described above. In the three preliminary seedling platforms,
The upper standby seedling platform in the overlapping state moves forward and downward and is positioned on the front side of the intermediate preliminary seedling platform, and the lower preliminary seedling platform in the overlapping state moves rearward and upward The spare seedling platform is configured to be switchable by the link mechanism so that the preliminary seedling platform is positioned in the rear side of the middle stage so that the preliminary seedling platform is in a developed state that is substantially straight in the front-rear direction. The agricultural machine according to claim 1 or 2. A stopper for preventing the seedling from falling off the spare seedling stage in the overlapped state is provided at the front of the preliminary seedling stage,
The stopper is in contact with the rear part of the preliminary seedling stage so that the rear part of the preliminary seedling stage on the front side and the front part of the preliminary seedling stage on the rear side are positioned relative to each other. The agricultural machine according to any one of Items 1 to 3.

Images