JP5123709B2 - Agricultural machine - Google Patents

Description

  The present invention relates to a farm 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 28)

  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, FIG. 15 in FIG. 15, FIG. 15 in FIG. 15, and 38 in FIG. 28) is provided that can be switched between a protruding standing posture and an overlaid 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 spare seedling platform is changed. There was room for improvement from the viewpoint of improving the workability of the switching work.
The present invention realizes an agricultural machine that can automatically change the posture of the movable stopper in accordance with the state switching of a plurality of preliminary seedling platforms and can easily and quickly change the state of the plurality of preliminary seedling platforms. The purpose is to do.

[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, and the preliminary seedling platforms are provided with a movable stopper. The posture of the movable stopper is changed between an action posture for preventing movement of the seedling placed on the preliminary seedling stand and a non-action posture for allowing movement of the seedling placed on the preliminary seedling stand. In addition to being configured, the movable stopper is changed in posture to the operating posture when switched to the overlapped state, and the movable stopper is changed to the non-active posture when switched to the deployed state.

(Function)
According to the first feature of the present invention, even if the movable stopper is not manually changed to the acting posture, the movable stopper is automatically changed to the acting posture simply by switching to the overlapping state. Thereby, it can prevent that the seedling mounted on the preliminary seedling mounting stand in the overlapping state falls back and forth. Further, even if the movable stopper is not manually changed to the non-acting posture, the movable stopper is automatically changed to the non-active posture simply by switching to the unfolded state. Thereby, the movement of the seedling between the preliminary seedling placing stands in a state where the front and rear are arranged side by side is allowed, and the seedling can be replenished from the cocoon or the like. As a result, the posture of the movable stopper can be automatically changed in accordance with the switching of the states of the plurality of preliminary seedling platforms, and the posture change of the movable stopper is not required when switching the states of the plurality of preliminary seedling platforms.

(Effect of the invention)
According to the first feature of the present invention, it is possible to easily and quickly change the state of the plurality of preliminary seedling platforms and improve the workability of the state switching operation of the plurality of preliminary seedling platforms.

[ Reference form ]
(Constitution)
A reference form of the present invention is to configure an agricultural machine 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, and the preliminary seedling platforms are provided with a movable stopper. The posture of the movable stopper is changed between an action posture for preventing movement of the seedling placed on the preliminary seedling stand and a non-action posture for allowing movement of the seedling placed on the preliminary seedling stand. And a detecting means for detecting the presence or absence of a seedling placed on the preliminary seedling stage, and when the presence of the seedling is detected by the detecting means, the movable stopper changes its posture to an action posture. The absence of seedlings is detected by the detection means. Once issued, the movable stopper are configured to be position change to a non-working position.

(Function)
According to the reference form of the present invention, even if the movable stopper is not manually changed in posture to the action posture, the posture of the movable stopper is automatically changed to the action posture only by placing the seedlings on the plurality of preliminary seedling platforms. Thereby, it can prevent that the seedling mounted on the preliminary seedling mounting stand in the overlapping state falls back and forth. Even if the movable stopper is not manually changed to the non-acting posture, the movable stopper is automatically changed to the non-operating posture simply by taking out the seedling from the spare seedling stage. Thereby, the movement of the seedling between the preliminary seedling placing stands in a state where the front and rear are arranged side by side is allowed, and the seedling can be replenished from the cocoon or the like. As a result, the posture of the movable stopper can be automatically changed depending on the presence / absence of the seedling, and the posture change of the movable stopper is not required when switching the state of the plurality of spare seedling platforms.

(Effect of the invention)
According to the reference form of the present invention, it is possible to easily and quickly change the state of a plurality of preliminary seedling platforms and improve the workability of the state switching operation of the plurality of preliminary seedling platforms.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the agricultural machine.
A plurality of right and left spare seedling platforms are provided on the right and left lateral sides of the aircraft, and the right and left spare seedling platforms are configured to be switchable between the overlapping state and the unfolded state, An operation tool for switching the plurality of preliminary seedling platforms to the overlapped state and the deployed state is provided over the right and left spare seedling platforms.

(Function)
According to a second feature of the present invention, a "working" as follows in addition to the "working" above.
According to the second feature of the present invention, it is possible to switch the overlapping state and the unfolding state of the plurality of right and left spare seedling platforms at a time only by operating a single operation tool. Thereby, the state switching of a plurality of preliminary seedling platforms can be performed more simply and quickly.

(Effect of the invention)
According to the second feature of the present invention, the following “effect of the invention” is provided in addition to the above “effect” .
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.

[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 (solid posture in FIG. 3) and a lying posture lying down forward from this standing posture (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 first supporting shaft 61B facing left and right is fixed to the front end portion via a boss member, and a second supporting shaft 61C facing left and right is fixed to the rear end portion.

  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. A left and right front support shaft 64 is fixed to the first boss 62A. 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 front support shaft 64 fixed to the boss portion 62A of the second linkage link 62 is connected to the front boss portion 30b of the first frame member 30 in the intermediate stage seedling mounting base 20m. It is linked so as to be rotatable about a left-right axis 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 to 22. 18 is a cross-sectional plan view showing the structure of the front and rear movable stoppers 70 and 80, and FIG. 19 is a longitudinal front view of the vicinity of the front movable stopper 70. As shown in FIG. FIG. 20 is a longitudinal side view of the vicinity of the front movable stopper 70. FIG. 21 is a longitudinal rear view of the vicinity of the rear movable stopper 80, and FIG. 22 is a vertical side view for explaining the operation of the rear movable stopper 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. Type rear fixed stopper 69, movable front movable stopper 70 mounted on the front part of the preliminary seedling stage 20m and the front part of the preliminary seedling stage 20d, and the rear part and the preliminary seedling stage of the preliminary seedling stage 20u. A movable rear movable stopper 80 provided at the rear of the table 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 fixing stopper 69 is fastened and fixed to the rear portion of the seedling receiving body 31d from the lower surface side. The rear fixing stopper 69 is formed in an angled vertical cross-sectional shape in a side view.

  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 mounts 20u and 20d, and the seedling receivers 31u and 31d 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 FIGS. 5 and 18, the front movable stopper 70 includes a movable stopper main body 71, a shaft member 72, and a bearing member 73. A front support shaft 64 fixed to the first boss portion 62A of the second linkage link 62 is supported on the front boss portion 30b of the first frame member 30 so as to be rotatable around a left-right axis P4. Yes. As a result, when the second linkage link 62 swings around the left-right axis P4 in accordance with the state switching of the preliminary seedling placement portion F, the front support shaft 64 is interlocked with the swing of the second linkage link 62. And is configured to rotate.

  A first support shaft 61B fixed to the first linkage link 61 is supported by the front boss portion 51b of the third frame member 51 so as to be rotatable around a left-right axis P3. As a result, when the first linkage link 61 swings around the axis P3 in the left-right direction as the state of the preliminary seedling placement portion F is switched, the first support shaft 61B is interlocked with the swing of the first linkage link 61. And is configured to rotate.

  A shaft member 72 is rotatably supported around a left and right axial center via left and right bearing members 73 below the seedling receivers 31m and 31d in the middle and lower standby seedling platforms 20m and 20d. The movable stopper main body 71 is fixed to the shaft member 72. Thereby, the movable stopper main body 71 is supported by the lower part of the seedling receptacles 31m and 31d so as to be rotatable around a left and right axis.

  The height of the upper end of the receiving portion 71a in the movable stopper main body 71 is higher than the seedling placement surface 31A of the seedling receptacles 31m and 31d in the action posture described later, and the seedling G placed on the seedling receptacles 31m and 31d. The height of the movable stopper main body 71 in the left-right direction is partially set at the inner part of the seedling G placed on the seedling receivers 31m and 31d. It is set to a length that can be received and supported. Thereby, it is effective that the seedling G falls off from the front portions of the middle and lower standby seedling platforms 20m and 20d in the overlapped and unfolded state by the support surface of the movable stopper main body 71. Can be prevented.

  An engaging member 74 is fixed to the outer ends of the front support shaft 64 and the first support shaft 61 </ b> B, and an engaging piece 75 that engages with the engaging member 74 is attached to the inner end of the shaft member 72. Is fixed.

  As shown in FIG. 19, when the middle stage seedling stage 20 m is swung upward from the lying posture (solid line posture in FIG. 19) around the longitudinal axis a, the engagement piece 75 of the shaft member 72 is moved. The engagement of the engaging piece 75 with the engaging member 74 is released in the standing posture of the intermediate seedling stand 20m apart from the engaging member 74 of the front support shaft 64. Thereby, the state where the interlocking connection of the front support shaft 64 and the shaft member 72 is released can be revealed with the posture change to the standing posture of the intermediate seedling stand 20m.

  On the other hand, when the middle stage seedling stage 20m is swung downward from the standing posture (the two-dot chain line posture in FIG. 19) around the longitudinal axis a, the engagement piece 75 of the shaft member 72 is moved forward. Engaging with the engaging member 74 of the shaft 64, the posture of the intermediate stage seedling placing table 20m is changed to the lying posture. Thereby, the interlocking connection state of the front support shaft 64 and the shaft member 72 can be revealed with the posture change to the lying posture of the intermediate seedling stand 20m.

  In addition, when both the overlapping state and the unfolding state of the preliminary seedling placement portion F are swung upward around the axis a in the front-rear direction from the lying down posture, the shaft member 72 The engaging piece 75 is configured to be separated from the engaging member 74 of the front support shaft 64.

  As shown in FIG. 20, when the standby seedling placement unit F is switched from the overlapped state to the deployed state in a state where the middle stage standby seedling platform 20 m is changed to the lying posture, the state of the preliminary seedling placement unit F is switched. Along with this, the second linkage link 62 swings around the left and right axis P4, and the front support shaft 64 rotates integrally with the second linkage link 62 and is fixed to the outer end portion of the front support shaft 64. The engaging member 74 is rotated about the left and right axis P4.

  And the movable stopper main body 71 rocks | fluctuates around the axial center P4 of the left-right direction via the engagement piece 75 engaged with the engaging member 74. As shown in FIG. Thereby, the receiving portion 71a of the movable stopper main body 71 stands on the upper side of the seedling placement surface 31A and from the action posture for preventing the movement of the seedling placed on the preliminary seedling placement stand 20m (the solid line posture in FIG. 20), The receiving portion 71a of the movable stopper main body 71 falls to the lower side of the seedling placement surface 31A and is in a non-acting posture (the posture of the two-dot chain line in FIG. 20) allowing the movement of the seedling placed on the preliminary seedling placement stand 20m. The posture of the front movable stopper 70 is changed.

  On the other hand, when the preliminary seedling placement portion F is switched from the expanded state to the overlapped state, the second linkage link 62 swings around the left and right axis P4 in accordance with the state switching of the preliminary seedling placement portion F. The part support shaft 64 rotates together with the second linkage link 62, and the engaging member 74 fixed to the outer end of the front support shaft 64 rotates about the left and right axis P4.

  And the movable stopper main body 71 rocks | fluctuates around the axial center P4 of the left-right direction via the engagement piece 75 engaged with the engaging member 74. As shown in FIG. As a result, the receiving portion 71a of the movable stopper body 71 lies down below the seedling placement surface 31A and prevents the movement of the seedling placed on the preliminary seedling placement base 20m (the two-dot chain line in FIG. 20). Posture), the receiving portion 71a of the movable stopper main body 71 stands on the upper side of the seedling placement surface 31A so as to allow the movement of the seedling placed on the preliminary seedling placement stand 20m (solid posture in FIG. 20). The posture of the front movable stopper 70 is changed.

  In the case where the middle stage seedling mounting base 20m is changed to the standing posture, the middle stage spare stage 71 is rotated while the movable stopper body 71 is rotated so that the position of the engagement piece 75 matches the position of the engaging member 74. The state in which the engagement piece 75 of the shaft member 72 is engaged with the engaging member 74 of the front support shaft 64 can be revealed by changing the posture of the seedling mount 20m from the standing posture to the lying posture.

  In this case, since the guide member 74a is formed on the engaging member 74, the position of the engaging piece 75 of the shaft member 72 does not have to be strictly matched with the position of the engaging member 74 of the front support shaft 64. The engaging piece 75 of the shaft member 72 can be easily engaged with the engaging member 74 of the front support shaft 64.

  In FIGS. 19 and 20, the front movable stopper 70 mounted on the middle stage seedling stage 20m has been described as an example. However, as shown in parentheses in FIGS. The front movable stopper 70 mounted on the platform 20d has the same structure and performs the same operation (movement) as described above.

  As shown in FIGS. 5 and 18, the rear movable stopper 80 includes a movable stopper main body 81, a shaft member 82, a bearing member 83, and a cam member 85. A support shaft 63B fixed to the third linkage link 63 is supported on the rear boss portion 30c of the first frame member 30 so as to be rotatable around a left-right axis P6. As a result, when the third linkage link 63 swings around the left-right axis P <b> 6 in accordance with the state switching of the preliminary seedling placement portion F, the support shaft 63 </ b> B rotates in conjunction with the swing of the third linkage link 63. It is configured to move.

  A second support shaft 61C fixed to the first linkage link 61 is supported on the rear boss portion 50b of the second frame member 50 so as to be rotatable about a left-right axis P2. As a result, when the first linkage link 61 swings around the axial center P <b> 2 in the left-right direction in accordance with the state switching of the preliminary seedling placement portion F, the second support shaft 61 </ b> C is interlocked with the swing of the first linkage link 61. And is configured to rotate.

  A shaft member 82 is rotatably supported around a left and right axial center via a left and right bearing member 83 at a lower portion of the seedling receivers 31u and 31m in the upper and middle preliminary seedling platforms 20u and 20m. The movable stopper body 81 is fixed to the shaft member 82. Thereby, the movable stopper main body 81 is supported by the lower part of the seedling receiving bodies 31u and 31m so that rotation is possible around the axis center facing left and right. An elastic spring 84 is provided across the lower parts of the seedling receivers 31u and 31m and the movable stopper main body 81, and the rear movable stopper 80 is urged toward the acting posture by the elastic spring 84.

  The height of the upper end of the receiving portion 81a in the movable stopper main body 81 is higher than the seedling placement surface 31A of the seedling receptacles 31u, 31m in the action posture described later, and the seedling G placed on the seedling receptacles 31u, 31m. The width of the movable stopper body 81 in the left-right direction is partially set at the inner part of the seedling G placed on the seedling receivers 31u and 31m. It is set to a length that can be received and supported. Accordingly, the seedling G is effectively removed from the rear portions of the upper and middle preliminary seedling platforms 20u and 20m in the overlapped and unfolded state by the support surface of the movable stopper body 81. Can be prevented.

  A cam member 85 is detachably fixed to the outer end portions of the support shaft 63B and the second support shaft 61C, and the inner end portion of the movable stopper body 81 contacts the cam surface 85A of the cam member 85. A contact portion 81A is formed. Accordingly, when the support shaft 63B and the second support shaft 61C rotate, the cam member 85 moves integrally with the support shaft 63B or the second support shaft 61C, and the rear portion is movable by the contact of the cam member 85 with the contact portion 81A. The movable stopper body 81 of the stopper 80 is configured to rotate.

  As shown in FIG. 21, when the middle stage seedling stage 20m is swung upward from the lying posture (solid line posture in FIG. 21) about the longitudinal axis a, the contact portion 81A of the movable stopper main body 81 is provided. Is separated from the cam member 85, and the engagement of the contact portion 81A with the cam member 85 is released in the standing posture of the middle stage seedling stage 20m. As a result, a state in which the interlocking connection between the support shaft 63B and the movable stopper main body 81 is released in accordance with the posture change to the standing posture of the intermediate seedling stand 20m can be revealed.

  On the other hand, when the intermediate stage seedling mounting base 20m is swung downward from the standing posture (the posture of the two-dot chain line in FIG. 21) about the longitudinal axis a, the contact portion 81A of the movable stopper main body 81 becomes the cam member. The contact portion 81A engages with the cam member 85, and the intermediate preliminary seedling stage 20m is changed to the lying posture. Thereby, the interlocking connection state of the movable stopper main body 81 and the support shaft 63B can appear with the posture change to the lying posture of the intermediate stage seedling stage 20m.

  In addition, in the state where the preliminary seedling placement unit F is in both the overlapped state and the deployed state, when the intermediate preliminary seedling placement base 20m is swung upward from the lying posture around the axis a in the front-rear direction, the movable stopper main body 81 The contact portion 81 </ b> A is configured to be separated from the cam member 85.

  Here, when the intermediate stage seedling stage 20m is swung upward from the lying posture around the longitudinal axis a, the engaging piece 75 of the shaft member 72 in the front movable stopper 70 is also connected to the front support shaft 64. Since it is configured so as to be separated from the engaging member 74, it is possible to change the posture of the intermediate seedling stage 20m to the standing position in both the overlapping state and the deployed state of the preliminary seedling placement portion F. become.

  In addition, in a state where the spare seedling placement unit F is overlapped, when the posture of the intermediate seedling placement base 20m is changed to the standing posture, the movable stopper body 81 is changed to the acting posture by the biasing force of the elastic spring 84. Since the positioning is performed, the state in which the contact portion 81A of the movable stopper main body 81 is in contact with the cam member 85 can be revealed only by laying the middle stage seedling stand 20m from the standing posture. In this case, since the guide portion 81b is formed on the movable stopper body 81 (see FIG. 18), the contact portion 81A of the movable stopper body 81 can be easily brought into contact with the cam member 85.

  On the other hand, in the state where the preliminary seedling placement portion F is deployed, when the posture of the intermediate preliminary seedling placement base 20m is changed to the standing posture, the movable stopper body 81 is rotated to contact the contact portion 81A of the movable stopper body 81. The contact portion 81A of the movable stopper main body 81 is brought into contact with the cam member 85 by changing the posture of the intermediate seedling stand 20m from the standing posture to the lying posture while matching the position of the cam member 85 with the position of the cam member 85. The status can be revealed. In this case, since the guide portion 81b is formed in the movable stopper body 81 (see FIG. 18), even if the position of the contact portion 81A of the movable stopper body 81 and the position of the cam member 85 are not strictly matched, The contact portion 81A of the movable stopper main body 81 can be easily brought into contact with the cam member 85.

  As shown in FIG. 22, when the standby seedling placement unit F is switched from the overlapped state to the deployed state in a state in which the intermediate stage seedling mounting base 20m is changed to the lying posture, the state of the preliminary seedling placement unit F is switched. Accordingly, the third linkage link 63 swings around the left and right axis P6, and the support shaft 63B rotates together with the third linkage link 63, and is fixed to the outer end of the support shaft 63B. Rotates in the forward direction (counterclockwise direction in FIG. 22) around the left-right axis P6.

  As shown in FIG. 22 (a), in a working posture in which the receiving portion 81a of the movable stopper main body 81 stands up and is positioned above the seedling placement surface 31A of the seedling receiving body 31m, the movable stopper main body is biased by the biasing force of the elastic spring 84. 81 is in contact with the outer periphery of the seedling receiver 31m, and the front inner surface side of the movable stopper body 81 is in contact with the cam member 85, so that the swinging of the movable stopper body 81 in the front-rear direction is restricted. It will be in the state.

  As shown in FIGS. 22A and 22B, when the cam member 85 rotates around the left and right axis P <b> 6, the cam member 85 starts to contact the outer surface side of the movable stopper main body 81. 22B and 22C, when the cam member 85 is further rotated, the outer surface side of the movable stopper main body 81 is resisted by the urging force of the elastic spring 84 by the cam surface 85A of the cam member 85. When pushed, the movable stopper body 81 rotates.

  As shown in FIGS. 22C and 22D, when the cam member 85 further rotates, the cam surface 85A of the cam member 85 rotates while contacting the outer surface side of the movable stopper main body 81, and the movable stopper The main body 81 rotates while being guided by the cam surface 85A of the cam member 85, and the receiving portion 81a of the movable stopper main body 81 falls down to the non-acting posture positioned below the seedling placement surface 31A of the seedling receiving body 31m. The posture of the rear movable stopper 80 is changed. In this state, the swinging of the movable stopper body 81 is restricted by the contact between the cam surface 85A of the cam member 85 and the movable stopper body 81.

  As a result, the receiving portion 81a of the movable stopper main body 81 rises from the action posture (the posture of FIG. 22A) in which the receiving portion 81a of the movable stopper main body 81 stands and is positioned above the seedling placement surface 31A of the seedling receiving body 31m. The posture of the rear movable stopper 80 is changed to a non-acting posture (posture in FIG. 22 (d)) located on the lower side of the seedling placement surface 31A of the seedling receiving body 31m.

  On the other hand, as shown in FIG. 22, when the preliminary seedling placement portion F is switched from the expanded state to the overlapping state, the third linkage link 63 is rotated around the axis P <b> 6 in the left-right direction as the state of the preliminary seedling placement portion F is switched. , The support shaft 63B rotates integrally with the third linkage link 63, and the cam member 85 fixed to the outer end of the support shaft 63B is rotated in the reverse direction around the left-right axis P6 (see FIG. 22). Rotate clockwise).

  As shown in FIGS. 22C and 22D, when the cam member 85 rotates around the left and right axis P6, the movable stopper main body 81 is moved to the cam surface 85A of the cam member 85 by the biasing force of the elastic spring 84. It rotates while touching.

  As shown in FIG. 22B, when the cam member 85 further rotates, the receiving portion 81a of the movable stopper main body 81 contacts the outer peripheral portion of the seedling receiving body 31m by the biasing force of the elastic spring 84, and the movable stopper The main body 81 is restricted from swinging forward. As shown in FIG. 22A, when the cam member 85 further rotates, the cam member 85 comes into contact with the inner surface of the front portion of the movable stopper body 81, and the swinging of the movable stopper body 81 to the rear side is restricted. It will be in the state.

  As a result, the receiving portion 81a of the movable stopper main body 81 lies down and receives the movable stopper main body 81 from the non-acting posture (posture in FIG. 22 (d)) positioned below the seedling placement surface 31A of the seedling receiving body 31m. The posture of the rear movable stopper 80 is changed to the action posture (the posture in FIG. 22A) in which the portion 81a stands and is located above the seedling placement surface 31A of the seedling receiving body 31m.

  In FIGS. 21 and 22, the rear movable stopper 80 mounted on the middle stage seedling stage 20m has been described as an example. However, as shown in parentheses in FIGS. The rear movable stopper 80 mounted on the base 20u has the same structure and operates (moves) in the same manner as described above.

  As shown in FIGS. 5 and 8, when the preliminary seedling placement unit F is switched from the overlapped state to the expanded state, the rear movable stopper 80 at the rear of the upper preliminary seedling placing base 20 u is automatically changed to the non-acting posture. At the same time, the front movable stopper 70 at the front portion of the middle stage seedling stage 20m is automatically changed to the non-acting posture. Thereby, between the seedling placement surface 31A of the front side seedling placing stand 20u and the seedling placing surface 31A of the front and rear center seedling placing stand 20m when the spare seedling placing portion F is in the unfolded state, Since the rear movable stoppers 70 and 80 are not present, the seedling G is allowed to move between the front and front and rear spare seedling platforms 20u and 20m.

  In addition, the rear movable stopper 80 at the rear part of the middle stage seedling stage 20m is automatically changed to the non-acting posture, and the front movable stopper 70 at the front part of the lower stage seedling stage 20d is automatically deactivated. The posture is changed to the posture. As a result, between the seedling placement surface 31A of the preliminary seedling placement stand 20m in the front and rear center and the seedling placement surface 31A of the rear spare seedling placement stand 20d when the preliminary seedling placement portion F is in the unfolded state, the front Therefore, the seedling G is allowed to move between the front and rear central and rear spare seedling platforms 20m and 20d.

  In this case, the front part of the preliminary seedling stage 20u on the front side with the preliminary seedling placement part F in the unfolded state is prevented from moving forward by the seedling G placed on the upper part by the front fixing stopper 68. The rear portion of the rear seedling placing stand 20d in the deployed state of the seedling placing portion F is prevented from rearward movement of the seedling G placed thereon by a rear fixing stopper 69.

  On the other hand, when the preliminary seedling placement unit F is switched from the expanded state to the overlapped state, the rear movable stopper 80 at the rear of the front preliminary seedling placement base 20u is changed to the action posture, and the front and rear central seedling placement stands 20m in front. The front movable stopper 70 is changed to an action posture. Accordingly, the rear movable stopper 80 prevents the seedling G placed on the upper stage seedling placing base 20u in the overlapped state with the spare seedling placing portion F from being moved back, and the spare seedling placing portion F is in the overlapping state. The forward movement of the seedlings G placed on the preliminary seedling placing stand 20m in the middle is blocked by the front movable stopper 70.

  In addition, the rear movable stopper 80 at the rear part of the front and rear central seedling placing table 20m is changed to the action posture, and the front movable stopper 70 at the front part of the rear spare seedling stand 20d is changed to the action attitude. . Accordingly, the rear movable stopper 80 prevents the seedling G placed on the middle stage seedling placing base 20m with the spare seedling placing portion F from overlapping, and the spare seedling placing portion F is in the overlapping state. The forward moving stopper 70 prevents the seedling G placed on the lower stage seedling mounting base 20d from moving forward.

  In this case, the front part of the upper stage seedling placing base 20u with the spare seedling placing part F overlapped is prevented by the front fixing stopper 68 from moving forward the seedling G placed on the upper part. The rear part of the lower stage seedling mounting base 20d with the seedling mounting part F overlapped is prevented from moving backward by the rear fixing stopper 69.

As described above, the front and rear movable stoppers 70, 80 are interlocked with the state switching of the preliminary seedling placement unit F, so that the front and rear movable stoppers 70, 80 are associated with the state switching of the preliminary seedling placement unit F.
Even without changing the posture, the postures of the front and rear movable stoppers 70 and 80 can be automatically changed to appropriate postures. Thereby, the state switching of the preliminary 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.

  In addition, since the position of the preliminary seedling stage 20 can be changed to the standing position in both the overlapping state and the unfolded state of the preliminary seedling stage F, the front and rear movable stoppers 70 in the lying position of the preliminary seedling stage 20 are provided. , 80 are interlocked with the state switching of the preliminary seedling placement unit F, the posture of the preliminary seedling placement base 20 can be changed to the standing posture. Thereby, the front and rear movable stoppers 70 and 80 are interlocked with the state switching of the preliminary seedling placement unit F to improve the workability of the state switching operation of the preliminary seedling placement unit F, while the preliminary seedling stage 20 is moved. The full width of the aircraft can be shortened by changing the posture to a standing posture.

[Status switching status of spare seedling placement section]
The state switching state of the spare seedling placement unit F will be described with reference to FIGS. 5, 7, 8, 10, and 23. FIG. 23 is a longitudinal side view of the preliminary seedling placement unit F in the unfolded state. As shown in FIG. 5 and FIG. 8, when the operation tool 46 is gripped from the overlapping state of the preliminary seedling placement unit F to operate the lock mechanism 40 to the unlocked state, 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, the second linkage link 62 swings around the left-right axis P4, and the third linkage link 63 rotates around the left-right axis P6. Swing with.

  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 seedling G can be efficiently replenished from the wrinkles or the like at the front of the body to the seedling platform 10 at the rear of the body.

  When the preliminary seedling placement part F is switched to the unfolded state, the front and rear movable stoppers 70 and 80 are automatically changed to the non-acting posture, so that the front side seedling placement base 20u and the front and rear central seedling placement are placed. The seedling G can be moved rearwardly between the stand 20m and between the front and rear spare seedling placing stands 20m and the rear spare seedling placing stand 20d.

  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.

  When the preliminary seedling placement part F is switched to the overlapping state, the front and rear movable stoppers 70 and 80 are automatically changed to the action postures, so that the seedling G placed on the preliminary seedling placement part F is Are received and supported by the upper and rear movable stoppers 70 and 80, from the rear part of the upper stage seedling stage 20u, the front part and rear part of the middle stage seedling stage 20m, and the front part of the lower stage seedling stage 20d. The seedling G 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 23, 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, in the case of 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 section 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. 23 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 23, the preliminary seedling placement unit F is configured such that the upper preliminary seedling stage 20u is expanded forward and downward and the lower preliminary seedling stage 20d is expanded 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. 23, 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. 24 is a schematic side view of the preliminary seedling placement unit F in this another embodiment.

  As shown in FIG. 24 (a), the lower preliminary seedling stage 20 d is fixed to the support frame 19, and the upper and middle preliminary seedling bases 20 u and 20 m are connected to the lower preliminary seedling stage via the link mechanism 60. It is linked to 20d. Then, as shown by a two-dot chain line in FIG. 24 (a), the preliminary seedling placement section is arranged so 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. 24 (b), the upper preliminary seedling stage 20 u is fixed to the support frame 19, and the intermediate 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 a two-dot chain line in FIG. 24 (b), the preliminary seedling placement is performed so that the middle and lower preliminary seedling placement stands 20m and 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 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 to Fig.25 (a), the preliminary seedling mounting part F in the overlapping state is comprised including the preliminary seedling mounting bases 120u and 120d of the upper and lower two stages. 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. 25 (b), the preliminary seedling placement section F in an overlapping state is configured by including 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. 25 (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 the overlapping state of the preliminary seedling placing part F , 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]
In place of the structure of the front and rear movable stoppers 70 and 80 and the interlocking structure with the link mechanism 60 in the above-mentioned [Best Mode for Carrying Out the Invention], the front and rear parts as shown in FIGS. The structure of the movable stoppers 170 and 180 and the interlocking structure with the link mechanism 60 may be adopted. FIG. 26 is a side view of the vicinity of the front movable stopper 170 in this alternative embodiment, and FIG. 27 is a plan view of the vicinity of the front movable stopper 170 in this alternative embodiment. In the following description, the front movable stopper 170 is shown as an example, but the same structure can be adopted for the rear movable stopper 180.

  As shown in FIG. 26 and FIG. 27, a U-shaped front bracket 53 having a longitudinal sectional shape opened frontward in a side view is provided at the front portion of the first frame member 30 of the intermediate seedling stand 20m. It is fixed. The front bracket 53 is formed with a vertical through hole, and a front movable stopper 170 is supported in the through hole so as to be swingable around a vertical axis d.

  The front movable stopper 170 includes a movable stopper main body 171 and a plate-like member 172. The movable stopper main body 171 of the front movable stopper 170 is formed by bending a round bar, so that an upper receiving portion 171A for receiving and supporting the seedling G placed on the intermediate preliminary seedling placing stand 20m is formed on the upper portion thereof. The lower receiving part 171B for receiving and supporting the seedling G placed on the lower preliminary seedling placing base 20d is formed at the lower part thereof, and the outer shape in front view in the action posture described later is opened outward. Shaped in a letter shape.

  In the case of the rear movable stopper 180, the upper receiving part receives and supports the seedling G placed on the upper preliminary seedling stage 20u, and the lower receiving part places it on the intermediate preliminary seedling stage 20d. You may comprise so that the seedling G may be received and supported.

  A laterally flat plate-like member 172 is fixed to the end of the upper receiving portion 171A, and the vertically supporting shaft portion of the movable stopper main body 171 is inserted into the vertically extending through hole of the front bracket 53 from below. With the inner fitting inserted, a plate-like member 172 is fitted and fixed to the upper end of the support shaft portion of the upper receiving portion 171A from above.

  As a result, the front movable stopper 170 swings outward around the vertical axis d and can receive and support the seedlings G placed on the intermediate and lower preliminary seedling platforms 20m and 20d (see FIG. 26 and a solid line posture in FIG. 27), and a non-acting posture (indicated by a two-dot chain line in FIG. 26 and FIG. 27) that swings inward about the vertical axis d and is in a state along the front-rear direction. In addition, the posture can be changed.

  In the action posture of the front movable stopper 170, the shape of the front movable stopper 170 is a U-shape so that an opening 170A opened in the front-rear direction is formed between the upper receiving portion 171A and the lower receiving portion 171B. Since the front movable stopper 170 is in the acting posture, the seedling G from the front can be replenished to the lower preliminary seedling mount 20d from the opening 170A. In the case of the rear movable stopper 180, the seedling G can be taken out from the preliminary seedling placing table 20 through the opening.

  This makes it difficult for the front movable stopper 170 to prevent the seedling G from being replenished from the front to the lower-stage preliminary seedling platform 20d, and the front movable stopper 170 causes the front and front intermediate seedling platforms 20m and 20d to move forward. The seedlings G can be replenished from the front without difficulty to the lower preliminary seedling mount 20d while preventing the fall.

  An elastic spring 173 is mounted across the front bracket 53 and the plate-like member 172 above the movable stopper main body 171, and the movable stopper main body 171 is urged toward the acting posture by the elastic spring 173.

  Vertical plate-shaped front and rear brackets 174 and 174 are fixed to the first frame member 30, and both end portions of the outer wire 176 a constituting the connecting wire 176 span over the front and rear brackets 174 and 174. Is fixed.

  A front arm member 171a is fixed to the lower side of the upper receiving portion 171A of the movable stopper main body 171, and one end portion of the inner wire 176b of the linkage wire 176 is around the vertical axis about the front arm member 171a. It is linked in a freely rotatable manner. A bracket 177 is fixed to the central portion of the first linkage link 61 in the longitudinal direction, and the other end portion of the inner wire 176b of the linkage wire 176 is rotatable around the axial center in the left-right direction. It is linked.

  Accordingly, when the preliminary seedling placement portion F is switched from the overlapped state to the expanded state, the first linkage link 61 swings around the axis P1 in the left-right direction counterclockwise in FIG. The bracket 177 fixed to the first linkage link 61 moves rearward and upward with the swinging motion. Then, the inner wire 176b is pulled rearward, the front arm member 171a swings backward, and the movable stopper body 171 swings forward around the vertical axis d against the urging force of the elastic spring 173. To do. As a result, the front movable stopper 170 is automatically changed to the non-acting posture as the spare seedling placement portion F is switched.

  On the other hand, when the preliminary seedling placement portion F is switched from the expanded state to the overlapped state, the first linkage link 61 swings around the axis P1 in the left-right direction clockwise in FIG. Along with the movement, the bracket 177 fixed to the first linkage link 61 moves forward and downward. Then, the movable stopper main body 171 swings backward around the vertical axis d by the biasing force of the elastic spring 173, the front arm member 171a swings forward, and the inner wire 176b is pulled forward. Thereby, the posture of the front movable stopper 170 is automatically changed to the acting posture in accordance with the state switching of the spare seedling placement portion F.

  Although not shown, all or a part of the front or rear movable stoppers 70 and 80 in the above-mentioned [Best Mode for Carrying Out the Invention] is replaced with the front or rear movable stopper 170, You may comprise 180.

  Further, instead of a configuration in which the seedling G is received and supported at the front or rear of the two-stage preliminary seedling stage 20 by the single front or rear movable stoppers 170 and 180, a single front or rear movable is possible. The stoppers 170 and 180 may be configured to receive and support the seedling G at the front or rear portion of the single preliminary seedling stage 20, and three or more by the single front or rear movable stoppers 170 and 180. The seedlings G may be received and supported at the front part or rear part of the plurality of preliminary seedling platforms 20.

[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, Although the example in which the preliminary seedling placement unit F is configured so that the postures 80 and 180 are automatically changed is shown, the seedling G is placed on the seedling receiver 31 as shown in FIGS. It may be configured such that the postures of the front and rear movable stoppers 270 and 280 are automatically changed depending on whether or not the seedling G is present on the seedling receiving body 31. Hereinafter, an example will be described. FIG. 28 is a longitudinal side view of the vicinity of the front movable stopper 270 in this alternative embodiment, and FIG. 29 is a plan view of the vicinity of the front movable stopper 270 in this alternative embodiment. In the following description, the front movable stopper 270 is shown as an example, but the same structure can be adopted for the rear movable stopper 280.

  As shown in FIGS. 28 (a) and 29, a bracket 271 is fixed to the lower surface side of the seedling receiver 31m, and the swing support shaft 272 rotates around the left-right axis of the bracket 271. It is supported freely.

  A swing plate-like swing member 273 that is long in the front-rear direction is fixed to the swing support shaft 272. The swing member 273 includes a stopper support portion 273 a extending forward from the swing support shaft 272 and a detection portion 273 b extending rearward from the swing support shaft 272.

  A stopper member 274 having an angled longitudinal section is fixed to the tip of the stopper support portion 273a of the swing member 273, and is placed on the seedling receiver 31m by the receiving portion 274a of the stopper member 274. It is comprised so that the seedling G may be prevented from falling off.

  A roller 275 that is rotatable about a left-right axis is attached to the detection unit 273b of the swing member 273, and the upper end of the roller 275 is formed on the seedling placement surface 31A of the seedling receiver 31m. It is comprised so that it may protrude upward from the open part 31B. As described above, the detection unit 273b of the swinging member 273 and the roller 275 constitute detection means for detecting the presence or absence of the seedling G placed on the seedling receiver 31m, and this detection means is a front movable stopper. 270 is integrally linked to 270.

  In addition to the front movable stopper 270, a detection means (not shown) for mechanically or electrically detecting the presence or absence of the seedling G placed on the seedling receiver 31 is provided. A configuration in which the stopper 270 is mechanically or electrically linked may be employed. Specifically, for example, the front movable stopper 270 and the detection means may be mechanically linked by a linkage link, a linkage wire or the like (not shown), for example, a limit switch or the like (not shown) as the detection means. Thus, the presence or absence of the seedling G may be detected electrically, and the front movable stopper 270 may be electrically changed in posture by an electric motor or the like (not shown).

  An elastic spring 276 is mounted across the bracket 271 and the swinging member 273, and by this elastic spring 276, the swinging member 273 is moved to the side where the detecting portion 273b of the swinging member 273 protrudes upward from the opening 31B. Is energized.

  As shown by a two-dot chain line in FIG. 28A, in a state where the seedling G is not placed on the seedling receiving body 31m, the roller 275 attached to the swinging member 273 is moved by the biasing force of the elastic spring 276. It protrudes from the opening 31B of the body 31m, the stopper member 274 swings downward, and the front movable stopper 270 is changed to the non-acting posture. In this case, the detection portion 273b of the swing member 273 contacts the swing restriction member 277, and the swing range of the front movable stopper 270 is restricted.

  As shown by the solid line in FIG. 28A, when the seedling G is placed on the seedling receiver 31m, the roller 275 attached to the swing member 273 against the urging force of the elastic spring 276 due to the weight of the seedling G. Comes out downward from the opening 31B of the seedling receiver 31m, the stopper member 274 swings upward, and the front movable stopper 270 is changed to the action posture.

  As a result, by placing the seedling G on the seedling receiver 31m, the front movable stopper 270 can be automatically changed to the working posture, and forgetting to change the posture of the front movable stopper 270 is prevented with a simple structure. can do. In addition, for example, in the case where the preliminary seedling placement unit F is switched from the overlapped state to the expanded state, an operation procedure is performed so that the seedling G is not placed on the seedling receiver 31m, whereby the preliminary seedling placement unit in the expanded state is set. It is not necessary to employ a complicated structure that changes the front movable stopper 270 to the non-acting posture in accordance with the state switching of F.

  As shown in FIG. 28 (b), in the unfolded state of the preliminary seedling placement portion F, a non-acting posture is provided at the lower rear portion of the seedling receiver 31m located on the front side of the seedling receiver 31m equipped with the front movable stopper 270. Since the preliminary seedling placement section F is configured so that the front movable stopper 270 is positioned at the top, even if the seedling G moves on the seedling receiver 31m and the roller 275 is pushed down, the stopper The upper end of the member 274 is in contact with the lower rear portion of the front seedling receiving body 31u, and the posture change to the action posture of the front movable stopper 270 is prevented by elastic deformation of the swing member 273. .

  Although not shown, all or a part of the front or rear movable stoppers 70 and 80 in the above-mentioned [Best Mode for Carrying Out the Invention] is replaced with the front or rear movable stopper 270, The front and rear movable stoppers 170 and 180 in the above-mentioned [third alternative embodiment of the invention] may be all or part of the front or rear movable stopper 270 in this alternative embodiment. , 280.

  In addition, the front or rear movable stoppers 270 and 280 in this alternative embodiment are also applied to the preliminary seedling placement unit that switches the plurality of preliminary seedling placement stands 20 between the overlapping state and the unfolded state with a structure different from that of the above embodiment. it can. 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. (Not shown), the front or rear movable stoppers 270 and 280 can be applied.

[Fifth 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], and [Invention] In the fourth alternative embodiment of the embodiment, the left spare seedling placement portion F is configured to be switchable by the left operation tool 46, and the right spare seedling placement portion F is switched by the right operation tool 46. Although the example comprised so that it was possible was shown, you may comprise the left and right reserve seedling mounting part F so that state switching is possible with one operating tool. Hereinafter, an example thereof will be described with reference to FIG. FIG. 30 is an overall plan view of a riding type rice transplanter according to another embodiment.

  As shown in FIG. 30, a circular pipe-shaped operating tool extends over the upper part of the second frame member 50 in the left side seedling stand 20u and the upper part of the second frame member 50 in the right side seedling stage 20u. Although not shown, the operation tool 146 is formed in a curved shape that is convex upward in a front view so as to avoid the bonnet 14.

  Left and right lock mechanisms 140 are provided on the upper portion of the second frame member 50 on the front side of the operation tool 146, and the lock mechanism 140 can maintain the overlapping state and the unfolded state of the preliminary seedling placement portion F. It is configured.

  Note that the lock mechanism 140 may be disposed at a different position. Specifically, for example, the lock mechanism 140 is provided at one place on the right side or the left side (one of the left and right lock mechanisms 140 described above is abolished), and the left and right spare seedlings are mounted by the single lock mechanism 140. You may comprise so that the duplication state and unfolding state of the mounting part F may be hold | maintained.

  As shown by the two-dot chain line in FIG. 30, by operating the left and right lock mechanisms 140 to the unlocked state and pushing or pulling the operation tool 146 forward from the overlapping state of the preliminary seedling placement unit F, Both the right and left spare seedling placement parts F can be switched to the unfolded state.

  On the other hand, by operating the left and right lock mechanisms to the unlocked state from the deployed state of the spare seedling placement unit F and pushing or pulling the operation tool 146 backward, both the right and left spare seedling placements are performed. The part F can be switched to the overlapping state.

  As a result, the states of the left and right spare seedling placement units F can be switched simultaneously by the single operation tool 146, and the state of the preliminary seedling placement units F can be easily and quickly switched.

  Although not shown, a lock release lever for operating the left and right lock mechanisms 140 is provided at the left and right central portions of the operation tool 146, and the lock release lever and the left and right lock mechanisms 140 are linked to a linkage mechanism (for example, a linkage wire). Thus, it may be configured such that the lock release lever can be gripped and operated substantially simultaneously with gripping the operation tool 146. As a result, the left and right lock mechanisms 140 can be operated in the unlocked state by operating the lock release lever at approximately the same time as the operation tool 146 is gripped. Overlapping state and unfolding state can be switched. In this case, when the grip release operation of the lock release lever is stopped, the lock mechanism 140 is spring-biased with the same structure as the lock mechanism 40 in the above-mentioned [Best Mode for Carrying Out the Invention], and the left and right lock mechanisms 140 are biased. May be configured to be operated in a locked state.

  In addition, although not shown, a configuration in which the operation tool 146 is disposed at a different position may be employed, or a configuration in which the operation tool 146 is mounted on a part other than the second frame member 50 may be employed. May be configured in different shapes and structures. Specifically, for example, a configuration in which the operation tool 146 is equipped on the link mechanism 60 (first to third link links 61 to 63) may be adopted, and the operation tool 146 is configured by a solid rod or a strip material. Alternatively, a configuration in which a resin grip (not shown) is attached to the operation tool 146 may be employed.

[Sixth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the front and rear movable stoppers 70, 80 are provided via the front support shaft 64, the first support shaft 61B, the support shaft 63B, or the second support shaft 61C. Are linked and linked to the link mechanism 60, and the above described [third alternative embodiment of the invention] shows an example in which the front and rear movable stoppers 170 and 180 are linked and linked to the link mechanism 60 via the linkage wire 176. However, a different member may be adopted as a member on the link mechanism 60 side for interlockingly connecting the front and rear movable stoppers 70, 170, 80, and 180, and the front and rear movable stoppers 70, 170, 80, and 180 may be used. You may employ | adopt the structure linked | related by a different structure. Specifically, although not shown, the front and rear movable stoppers 70, 170, 80, 180 may be linked to the link mechanism 60 by 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 embodiment of the embodiment, the fifth embodiment of the invention, and the sixth embodiment of the invention, an example in which the seedling planting device 6 is configured to have a six-row planting specification is shown. 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, and the sixth embodiment of the invention, the preliminary seedling placement portion F of the riding type rice transplanter is shown as an example. The present invention can be similarly applied to different farm working machines provided with 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.

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 Transverse plan view showing the structure of the front and rear movable stoppers Longitudinal front view near the front movable stopper Longitudinal side view near the front movable stopper Longitudinal rear view near the rear movable stopper A longitudinal side view explaining the operation of the rear movable stopper 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 Plan view of the vicinity of the front movable stopper in the third alternative embodiment of the invention Vertical side view of the vicinity of the front movable stopper in the fourth alternative embodiment of the invention Plan view of the vicinity of the front movable stopper in the fourth alternative embodiment of the invention Overall plan view of a riding type rice transplanter in a fifth alternative embodiment of the invention

19 Support Frame 20 Spare Seed Stand 20u Spare Seed Stand 20m Reserve Seed Stand 20d Reserve Seed Stand 70 Front Movable Stopper (movable stopper)
80 Rear movable stopper (movable stopper)
146 Operation tool 270 Front movable stopper (movable stopper)
273b Detection unit (detection means)
275 roller (detection means)
280 Rear movable stopper (movable stopper)
G seedling (spare seedling)

Claims (2)

A support frame provided on a lateral side of the machine body, and a plurality of preliminary seedling support tables supported by the support frame;
The plurality of spare seedling stands in an overlapped state in which the plurality of preliminary seedling placing bases are vertically overlapped in a plan view and a deployed state in which the plurality of preliminary seedling placing stands are deployed in a substantially straight line in the front-rear direction. Configure the seedling stand so that it can be switched,
The preliminary seedling stage is provided with a movable stopper, and the movable stopper prevents the movement of the seedling placed on the preliminary seedling stage, and the movement of the seedling placed on the preliminary seedling stage. And can be changed to a non-action posture that allows
An agricultural machine configured to change the posture of the movable stopper to an operating posture when switched to an overlapping state, and to change the posture of the movable stopper to a non-active posture when switched to a deployed state. A plurality of right and left spare seedling platforms are provided on the right and left lateral sides of the aircraft, and the right and left spare seedling platforms are configured to be switchable between the overlapping state and the unfolded state,
The right and over a plurality of preliminary seedling stand on the left, agricultural machine according to claim 1 Symbol placement are provided with an operation member for switching the stand plurality of preliminary seedling to the overlapping state and a deployed state.

Images