JP2012050466A - Reserve seedling stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable comfortably conveying a seedling box in a reserve seedling stand of, such as a sulky rice transplanter, by switching to a rail condition in which a plurality of seedling box placing surfaces of reserve seedling stands form a conveying surface of a shape of a rail long in one direction by rotating a link.SOLUTION: The reserve seedling stands include: an upper reserve seedling stand (12d); a middle reserve seedling stand (12c); and a lower reserve seedling stand (12b) and the reserve seedling stands (12b, 12c, 12d) are mutually connected with a link (26). The reserve seedling stands are configured switchable by rotation of the link (26), between a remote seedling box placing condition where the upper reserve seedling stand (12d), the middle reserve seedling stand (12c) and the lower reserve seedling stand (12b) are placed with a fixed interval in a vertical direction, and a rail condition in which a box placing surface of the upper reserve seedling stand (12d), the middle seedling reserve seedling stand (12c) and the lower reserve seedling stand (12b) forms a rail-like conveying surface long in one direction.

Description

  The present invention relates to a reserve seedling platform such as a riding rice transplanter or a seedling transplanter.

  In a spare seedling platform such as a riding rice transplanter, a folding-type spare seedling platform that replenishes the seedling from the shore is provided on the traveling machine body. It is known that the movable preliminary seedling platform connected to the seedling platform is configured in the same shape, and that the left and right side plates of these preliminary seedling platforms are connected by connecting members in the horizontal direction (Patent Document 1). ).

JP 2006-109773 A

The present invention relates to a standby seedling platform such as a riding rice transplanter, in which a link is rotated to switch to a rail state in which a seedling box mounting surface of a plurality of preliminary seedling platforms forms a rail-shaped transport surface that is long in one direction. Thus, the seedling box can be transported easily. In addition, when forming a rail-shaped transport surface that is long in the front-rear direction with a movable preliminary seedling stand positioned forward and backward with respect to the fixed preliminary seedling stand, the movable preliminary seedling stand is firmly supported and the seedling box is transported stably. Is something to try.

The invention of claim 1 comprises an upper preliminary seedling stage (12d), an intermediate preliminary seedling stage (12c), and a lower preliminary seedling stage (12b), and each of the preliminary seedling stages (12b, 12c, 12d). Are linked by links (26, 30, 38), and by rotating the links (26, 30, 38), an upper preliminary seedling stage (12d), an intermediate preliminary seedling stage (12c), and a lower preliminary seedling stage ( 12b) is a seedling box placement state in which the seedling box is placed in the vertical direction, and the seedling box placement surfaces of the upper preliminary seedling stage (12d), the middle preliminary seedling stage (12c), and the lower preliminary seedling stage (12b) are switch to the rail state forming a long rail-like conveying surface in one direction can be a preliminary seedling table configured.

According to a second aspect of the present invention, there is provided the preliminary seedling stage according to the first aspect, wherein the stopper (29) at the end of the preliminary seedling stage is retracted in conjunction with switching to the rail state .
According to a third aspect of the invention, the link (26, 30, 38) is in a rearwardly inclined posture in the seedling box mounting state, and is in a frontwardly inclined posture in the rail state. A stand .

The invention according to claim 4 is a configuration in which after the link is rotated, the end portions of the mutual seedling placing bases (12b, 12c, 12d) are connected to each other by the connecting portions (39a, 39b) and switched to the rail state. The preliminary seedling stage according to any one of claims 1 to 3 is used.

According to the present invention, the seedling box can be transported easily by rotating the link (26, 30, 38) to switch to the rail state .

Side view of riding rice transplanter Top view of riding rice transplanter (A) Perspective view of spare seedling stage (B) Side view of preliminary seedling stage Side view of spare seedling platform Side view of spare seedling platform Side view of riding rice transplanter Top view of riding rice transplanter Control block diagram flowchart (A) Side view of the spare seedling table (B) Side view of the mating connection part of the preliminary seedling table (C) Plan view of the lock configuration of the mating connection part of the preliminary seedling table Top view of riding rice transplanter Side view of riding rice transplanter Control block diagram flowchart

  FIG.1 and FIG.2 is the side view and top view of the riding rice transplanter which equipped with the preliminary seedling stand of this invention. In this riding rice transplanter, a seedling planting device 2 is connected to the rear of the traveling machine body 1 so as to be movable up and down. The seedling planting device 2 is a well-known device that places mat seedlings on a seedling platform 2a and plants seedlings in a field with a seedling planting tool 2b while the traveling machine 1 is traveling.

  The rotational power of the engine E is transmitted to the transmission case 4 through the belt transmission device 3 and the hydraulic continuously variable transmission HST at the front side portion of the traveling machine body 1 and is shifted by a sub-transmission device (not shown) in the transmission case 4. The traveling power is transmitted to the left and right front wheels 5F, 5F and the left and right rear wheels 5R, 5R, and the working power is transmitted to the seedling planting device 2 via a PTO shaft (not shown).

  The engine E is covered with a bonnet 6, a steering handle 7 is provided at the top of the bonnet 6, and a seat 8 is provided at the rear of the bonnet 6. An airframe cover 9 is disposed on the upper surface of the traveling machine body 1 so as to cover both the left and right sides of the bonnet 6 and the seat 8, and the operator can move back and forth through the bonnet 6 on the airframe cover 9 and the left and right sides of the seat 8. It is configured as follows.

  On the left and right sides of the bonnet 6 in the traveling machine body 1, left and right preliminary seedling platforms 12, 12 for previously placing seedling boxes (not shown) to be supplied to the seedling platform 2 a of the seedling planting device 2 are arranged. is doing.

Next, the left and right preliminary seedling platforms 12, 12 will be described in detail with reference to FIG.
The left and right spare seedling platforms 12 and 12 include left and right preliminary seedling platform frames 12a and 12a, and a plurality of upper and lower lower and lower preliminary seedling platforms 12b supported by the left and right preliminary seedling platform frames 12a and 12a,. The middle stage preliminary seedling stage 12c,... And the left and right upper stage preliminary seedling stage 12d,. And right and left side plates 21 and 21 are provided on the left and right sides of these left and right lower and middle preliminary seedling platforms 12b, 12b, 12c and 12c so as to protrude vertically from the seedling box support surface. (Not shown) can be placed.

  In addition, left and right side plates 21 and 21 protruding up and down from the seedling box support surface are provided on the left and right sides of the left and right upper stage preliminary seedling mounting bases 12d and 12d that are fixedly supported on the left and right preliminary seedling mounting frames 12a and 12a. Only the upper surface of the mounting and seedling box support surface is used as a mounting surface for the seedling box, and front and rear support frames 22a and 22b are provided on the lower surface side of the seedling box support surface so as to be freely inserted and removed in the front and rear direction.

  In addition, left and right connecting arms 14 attached to the front end of the left and right side plates 21 and 21 of the upper preliminary seedling stage 12d, and left and right connection attached to the front end of the left and right side plates 21 and 21 of the middle preliminary seedling stage 12c. The arms 15,... Are pivotally connected by left and right pins 16,..., And as shown in FIG. As shown in FIG. 3 (B), when the middle preliminary seedling stage 12d is turned upside down, the seedling box is placed in front of the upper preliminary seedling stage 12d. The middle stage preliminary seedling stage 12c can be supported in a state where it is deployed forward and backward by the front support frame 22a which is moved with the mounting surface being flush and is pulled out from the lower surface of the upper stage preliminary seedling stage 12d. .

  The left and right connecting arms 17 attached to the rear end portions of the left and right side plates 21 and 21 of the upper preliminary seedling stand 12d and the rear end portions of the left and right side plates 21 and 21 of the lower preliminary seedling stand 12b. The left and right connecting arms 18,... Are pivotally connected by the left and right pins 20,..., And as shown in FIG. When the lower preliminary seedling stage 12b is turned upside down, the seedling box is placed behind the upper preliminary seedling stage 12d. The surface is moved in a flush state, is pulled out from the lower surface of the upper preliminary seedling stage 12d, is supported by the support frame 22b, and the upper preliminary seedling stage 12d and the lower preliminary seedling stage 12b are unfolded back and forth. Configured to be .

  According to the above-described configuration, the middle stage preliminary seedling stage 12d and the lower stage preliminary seedling stage 12b with the seedling box mounting surface being flush with each other are positioned before and after the fixed upper stage preliminary seedling stage 12d. The seedling box can be placed from the front side to the rear side of the machine body and can be easily supplied to the feeding seedling planting device 2.

  In addition, the lower and upper support frames 22a and 22b that are movable and locked in the front-rear direction on the lower surface of the upper preliminary seedling table 12d support the lower surfaces of the middle preliminary seedling table 12c and the lower preliminary seedling table 12b. Therefore, the middle preliminary seedling stage 12c and the lower preliminary seedling stage 12b that are reversed and rotated can be firmly supported.

  In addition, since the middle stage preliminary seedling stage 12c and the lower stage preliminary seedling stage 12b are arranged in the same plane before and after the upper stage preliminary seedling stage 12d to constitute the seedling box transport rail in the front and rear direction, The operator can easily transport the seedling box in a standing position. In addition, since the front and rear support frames 22a and 22b that are freely movable in the front-rear direction are supported on the lower surface portion of the upper stage seedling stage 12d, the middle stage seedling stage 12c and the lower stage spare that rotate in the reverse direction are supported. The seedling stage 12b can be firmly supported while having a simple configuration.

  Further, a front support frame 22a and a rear support frame 22b that are movable in the front-rear direction are disposed on the lower surface portion of the upper preliminary seedling stage 12d at a high position, so that the middle preliminary seedling stage 12c and the front side are in a flush state. Since the rear lower stage seedling stage 12b is supported, the operator can easily put the front support frame 22a and the rear support frame 22b in and out while standing.

Next, another embodiment of the preliminary seedling stage 12 will be described with reference to FIG.
The lower preliminary seedling stage 12b is attached to the upper end of the left and right preliminary seedling stage frames 12a and 12a, and the left and right side plates 22 and 22 of the lower preliminary seedling stage 12b and the left and right side plates 22 and 22 of the middle preliminary seedling stage 12c. The space is pivotally connected by left and right front and rear links 26 and 26 and left and right pins. As shown in FIG. 4 (A), when the left and right front and rear links 26, 26 are locked and fixed by the stoppers 28, 28 in the rear inclined state positioned on the upper side, a predetermined interval is provided above the lower preliminary seedling platform 12b. This is a configuration in which the middle stage seedling stage 12c is located in the empty space.

  Further, a rotation stopper 29 is pivotally supported by a left and right pin at the front end of the lower preliminary seedling stage 12b, and is urged by the spring 29a so as to always rotate upward, thereby lowering the lower preliminary seedling stage 12b. The left and right front / rear links 26 and 26 are pivoted forward and downward, and when the lower surface of the intermediate preliminary seedling platform 12c hits the pivot stopper 29, the pivot stopper 29 is moved to the front. And the middle stage preliminary seedling stage 12c is configured to support the seedling box mounting surface in a flush state.

  Further, the left and right side plates 22 and 22 of the middle preliminary seedling stage 12c and the left and right side plates 22 and 22 of the upper preliminary seedling stage 12d are connected and supported by left and right front and rear links 26 and 26 and left and right pins. As shown in FIG. 4 (A), when the left and right front / rear links 26, 26 are locked and fixed by the stoppers 28, 28 in a rearward inclined state positioned on the upper side, a predetermined interval is provided above the intermediate preliminary seedling platform 12c. In this configuration, the upper preliminary seedling stage 12d is located.

In addition, a rotation stopper 29 is pivotally supported by a left and right pin at the front end of the middle stage seedling stage 12c and is urged by the spring 29a so that it always tends to pivot upward. It is configured to fit within the longitudinal length. When the left and right front / rear links 26, 26 rotate forward and downward and the lower surface of the upper preliminary seedling platform 12d hits the rotational stopper 29, the rotational stopper 29 pivots forward to support the upper preliminary seedling platform 12d. It is configured to do.

  According to the above configuration, when the left and right front / rear links 26,... Are pivoted forward and downward, the lower, middle, and upper standby seedling platforms 12b, 12c, and 12d are rails in the front-rear direction with the seedling box receiving surfaces being flush with each other. The seedling boxes can be easily transported from the front side to the rear side and supplied to the seedling planting apparatus 2.

  Although not shown in the drawing, a middle stage seedling stage 12c is attached to the upper end of the left and right spare seedling stage frames 12a and 12a, and the left and right side plates 22 and 22 of the middle stage seedling stage 12c and the upper stage seedling stage 12d. The left and right side plates 22 and 22 are pivotally connected by left and right front and rear links 26 and 26 and left and right direction pins, and left and right side plates 22 and 22 of the middle stage preliminary seedling stage 12c and left and right side plates 22 of the lower stage preliminary seedling stage 12b, 22 is pivotally connected by left and right front and rear links 26 and 26 and left and right pins, the lower preliminary seedling stage 12b is rotated upward, and the upper preliminary seedling stage 12d is rotated downward. Even if the seedling stage 12c, the lower preliminary seedling stage 12b, and the upper preliminary seedling stage 12d form a seedling box transport receiving surface in which the seedling box mounting surface is in a flush state, the same effects as in the above embodiment are obtained. Play.

Moreover, as shown in FIG. 5, you may comprise the left and right reserve seedling platforms 12, 12.
The lower preliminary seedling platform 12b is fixed in a horizontal state to the upper ends of the left and right preliminary seedling platform frames 12a and 12a, and the left and right side plates 22 and 22 of the lower preliminary seedling platform 12b and the left and right side plates 22 of the middle preliminary seedling platform 12c. , 22 is pivotally connected by left and right links 30 and 30 and left and right pins, and when the upper part of the left and right links 30 and 30 is rotated to a rearward inclined posture located rearward, FIG. As shown in FIG. 2B, the stoppers (not shown) on the lower preliminary seedling table 12 and the stoppers (not shown) on the middle preliminary seedling table 12c are in contact with the left and right links 30 and 30, and the lower preliminary seedling mounting table in the horizontal state. It is configured such that the intermediate stage preliminary seedling stage 12c in a horizontal state is positioned above 12b with a predetermined interval.

  Further, the middle preliminary seedling stage 12c and the upper preliminary seedling stage 12d are similarly connected by the left and right links 30 and 30, and the upper inclined portions of the left and right links 30 and 30 are in a rearward inclined posture in which they are located rearward. When rotated, as shown in FIG. 5 (A), the middle preliminary seedling stage 12c and the upper preliminary seedling stage 12d are configured to be supported in a horizontal state at a predetermined interval. These spare seedling platforms 12b, 12c, 12d are provided with rollers 27,.

  Further, as shown in FIG. 5B, when the left and right links 30,... Are rotated downward in the front direction, the front side portion of the middle stage preliminary seedling stage 12c comes into contact with the front side part of the lower stage preliminary seedling stage 12b and is in a horizontal state. Then, it is fixed by a locking pin (not shown), and is fixed by a locking pin (not shown) when the front side part of the upper preliminary seedling stage 12d comes into contact with the front side part of the middle preliminary seedling stage 12c and becomes horizontal. By doing so, a long seedling support rail which is long in the front-rear direction can be formed, and the seedling box can be easily transferred to the rear side and replenished to the seedling planting device 2.

Next, FIGS. 6 to 9 will be described.
Left and right preliminary seedling placement rails 31 and 31 are disposed on the left and right sides of the bonnet 6 in the traveling machine body 1. The left and right preliminary seedling placement rails 31 and 31 are configured to be long in the front-rear direction, the front end thereof is extended to the front end of the traveling machine body 1, and the rear end thereof is to the vicinity of the front end of the seedling planting device 2. It is extended.

  The front and rear intermediate portions of the left and right preliminary seedling placement rails 31 and 31 are supported on the upper end portions of the left and right preliminary seedling placement rail frames 31a and 31a by left and right pins so as to be rotatable up and down. The left and right preliminary seedling mounting rails 31 and 31 are configured to be movable up and down by the left and right rail lifting cylinders 32L and 32R, and the left and right preliminary seedling mounting rails 31 and 31 are configured to be adjustable to be changed to a front uphill inclination posture or a rear uphill inclination posture. ing.

  As shown in FIG. 8, on the input side of the control unit 33, there are a left seedling supply switch SW1 provided on the left side of the steering handle 7 and a right seedling supply switch SW2 provided on the right side of the steering handle 7. The left rail elevating cylinder 32L and the right rail elevating cylinder 32R are connected to the output side of the control unit 33 through driving means.

  According to the above configuration, as shown in FIG. 9, when the raising / lowering control of the left and right preliminary seedling placement rails 31, 31 is started, it is determined whether or not the left seedling supply switch SW <b> 1 is ON (step S <b> 1). When the switch SW1 is ON, the left rail raising / lowering cylinder 32L is reduced to adjust the left auxiliary seedling mounting rail 31 to the forward ascending posture, and the right rail raising / lowering cylinder 32R is extended to lower the right auxiliary seedling mounting rail 31 forward. An inclined posture is set (step S2).

  Therefore, when replenishing seedlings to the seedling placing table 2a on the left side of the seedling planting device 2, a seedling box containing mat seedlings is placed on the front side of the left spare seedling placing rail 31 and transferred to the rear side to plant seedlings. The seedling can be replenished easily on the seedling platform 2a on the left side of the apparatus 2. Further, the seedling box that has been emptied can be placed on the rear side of the right spare seedling mounting rail 31 and transferred to the front side for easy recovery.

  When the left seedling supply switch SW1 is not ON (step S1), it is next determined whether or not the right seedling supply switch SW2 is ON (step S3). The cylinder 32R is reduced to adjust the right preliminary seedling placement rail 31 to the forward ascending posture, and the left rail lifting cylinder 32L is extended to bring the left preliminary seedling placement rail 31 into the forward and downward inclination posture (step S2).

  Therefore, when replenishing seedlings to the right side of the seedling placing stand 2a of the seedling planting device 2, a seedling box containing mat seedlings is placed on the front side of the right spare seedling placing rail 31 and transferred to the rear side to plant seedlings. The seedling can be replenished easily on the seedling mount 2a on the right side of the apparatus 2. Further, the seedling box that has been emptied can be placed on the rear side of the left preliminary seedling loading rail 31 and transferred to the front side for easy recovery.

  Further, it is determined whether or not the right seedling supply switch SW2 is ON. If the right seedling supply switch SW2 is not ON (step S3), the right rail lifting cylinder 32R and the left rail lifting cylinder 32L are extended to the standard state, and the left and right spares are reserved. The seedling mounting rails 31 and 31 are set to a horizontal posture and returned to the holding posture of the seedling box (step S5).

According to the said structure, replenishment conveyance and collection | recovery conveyance of a seedling box can be made easy, making the feed direction of a seedling box inclining down the left and right preliminary seedling stand rails 31 and 31 long in the front-back direction.
Next, another embodiment of the preliminary seedling stage 12 will be described with reference to FIG.

  The left and right spare seedling platforms 12, 12 include left and right preliminary seedling platform frames 12a, 12a, left and right intermediate seedling platforms 12c,... Left and right lower stage preliminary seedling stage 12b, which is placed and supported on the lower stage support stage 36 of the stage frames 12a, 12a, and upper left and right stages which are placed and supported on the upper stage support base 37 of the left and right preliminary seedling stage frames 12a and 12a. It is comprised by the preliminary seedling stand 12d.

  The left and right connecting rods 38, 38 are pivotally supported by the left and right pins 38a, 38a on the middle left and right sides of the middle stage seedling stage 12c, and are formed at one end of the left and right connecting rods 38, 38. , 38b are fitted and supported to the left and right pins 38c, 38c provided at the rear end of the upper stage preliminary seedling platform 12d, and the elongated holes 38d, 38d formed at the other ends of the left and right connecting rods 38, 38 The left and right pins 38e and 38e provided at the front end of the lower preliminary seedling stage 12b are fitted and supported.

  Further, the rear end portion of the middle preliminary seedling stand 12c and the rear end portion of the upper preliminary seedling stand 12d are configured as fitting connection portions 39a and 39b, so that the seedling box placement surface of the middle preliminary seedling stand 12c is formed. And the seedling box mounting surface which turned the upper stage preliminary seedling mounting stand 12d upside down can be connected in a flush state. Further, the front end portion of the middle preliminary seedling stage 12c and the front end portion of the lower preliminary seedling stage 12b are configured as fitting connection portions 39c and 39d, so that the seedling box placement surface of the middle preliminary seedling stage 12c is formed. And a seedling box mounting surface obtained by inverting the lower preliminary seedling mounting table 12b upside down.

  According to the above configuration, as shown in FIG. 10 (A), left and right lower stage preliminary seedlings that are placed on and supported by the lower stage support base 36 of the left and right preliminary stage seedling stage frames 12a and 12a. A plurality of upper and lower tiers on which a seedling box can be placed by the stage 12b, ... and the left and right preliminary seedling stage frames 12a, 12a placed on and supported by the upper stage support stage 37 on the left and right preliminary seedling stage frames 12a, 12a. It constitutes a stand for seedlings. In this state, the left and right connecting rods 38 and 38 are inclined upward to the rear and are supported by the left and right preliminary seedling support frames 12a and 12a by the stoppers 41 and 41, and the lower and upper preliminary seedling support bases 12b and 12d are the upper stage, The lower stage supports 36 and 37 are placed and supported horizontally.

  Further, the left and right connecting rods 38, 38 are rotated in the clockwise direction to be in a horizontal state, the lower and upper preliminary seedling platforms 12b, 12d are turned upside down to be horizontal, and then the long holes of the left and right connecting rods 38, 38 are When it moves along the side 38b and 38d to the side closer to the middle stage seedling stage 12c, the fitting connecting portions 39a, 39b, 39c, and 39d are fitted, and as shown in FIG. 42a and the lock pin 43 are fixed, and the lower, middle and upper preliminary seedling platforms 12b, 12c and 12d form a long and uniform seedling box transport surface in the front-rear direction, and the seedling box can be transported easily.

  Next, FIG. 11 will be described. The left and right preliminary seedling platforms 12, 12 are supported by the left and right preliminary seedling platforms frames 12a, 12a, the left and right preliminary seedling platforms 12, 12a, 12a, and the left and right preliminary seedling platforms 12b,. ,... Are constituted by left and right upper stage preliminary seedling platforms 12d,. The lower portions of the left and right preliminary seedling support frames 12a and 12a are configured as L-shaped refracting portions 12n and 12n in plan view, and the front end portion of the traveling machine body 1 is connected to the vertical pins 44 and 44. In addition, a footrest step 45 is provided on the refracting portions 12n and 12n.

  Then, in the traveling work state in which the left and right preliminary seedling support platforms 12 and 12 are rotated to the left and right sides, the refracting portions 12n and 12n of the left and right preliminary seedling support frames 12a and 12a move the front side portion and the front left and right side portions of the traveling machine body 1. Covers and functions as a bumper. Further, in the state where the left and right preliminary seedling platform 12, 12 is rotated to the front side of the machine body in the stopped seedling box replenishment state, the refracting portions 12 n and 12 n of the left and right preliminary seedling platform frames 12 a and 12 a protrude forward of the traveling machine body 1 Steps 45 and 45 are configured to protrude forward of the machine body, and are provided with a locking member that locks the left and right preliminary seedling placing platforms 12 and 12 in a traveling work state and a stopped seedling supplying state.

  According to the above-described configuration, when the seedling box is replenished from the shore, the left and right preliminary seedling platforms 12 and 12 are rotated in front of the traveling machine body 1 to turn the shoreside seedling box into the left and right preliminary seedling platforms 12 and 12. It can be loaded easily, and when the shore is separated from the aircraft, the aircraft is used by using the footrest steps 45 and 45 provided in the refracting portions 12n and 12n of the left and right preliminary seedling support frames 12a and 12a. Can get on and off easily.

  Moreover, you may comprise as shown in FIG.12 and FIG.13. The left and right preliminary seedling platforms 12, 12 are supported by the left and right preliminary seedling platforms frames 12a, 12a, the left and right preliminary seedling platforms 12, 12a, 12a, and the left and right preliminary seedling platforms 12b,. ,... Are constituted by left and right upper stage preliminary seedling platforms 12d,. On the upper side of the left and right preliminary seedling support frames 12a and 12a, one end in the longitudinal direction of the left and right lower, middle and upper preliminary seedling mounting bases 12b, 12c and 12d is supported, and travels on the left and right preliminary seedling support frames 12a and 12a. As shown in FIG. 12, in the seedling replenishment state, the other ends of the left and right preliminary seedling base frames 12a and 12a to the other seedling bases 12b, 12c and 12d are configured. The side is protruded long to the rear side, and is configured to approach the seedling planting device 2.

  Further, in the state where the other end sides of the left and right preliminary seedling platforms 12b, 12c, and 12d protrude rearward in the seedling replenishment state, a check means for checking the traveling of the traveling machine body 1 is provided and the traveling is impossible. As shown in FIGS. 1 and 2, the traveling machine body 1 is provided with an HST lever 54 for shifting the hydraulic continuously variable transmission HST. Further, as shown in FIG. A seedling frame rearward movement detection sensor 52 that detects the rearward protruding state of the seedling platforms 12b, 12c, and 12d is provided, and an HST forced neutral cylinder 53 is connected to the output side of the control unit 51 via a driving unit. The HST forced neutral cylinder 53 is configured to forcibly return the trunnion shaft (not shown) of the hydraulic continuously variable transmission HST and the HST lever 54 to the neutral position.

  As shown in FIG. 14, when the control is started, it is determined whether or not the backward movement detection sensor 52 detects the backward movement of the left and right preliminary seedling platforms (step S1), and the left and right preliminary seedling platforms 12b, When the backward movement of 12c and 12d is detected, the HST forced neutral cylinder 53 is operated (step S2), and the HST lever 54 is returned to the neutral position. Further, when the backward movement detection sensor 52 has not detected the backward movement of the left and right auxiliary seedling platforms 12b, 12c, 12d, the neutral position return restriction of the HST forced neutral cylinder 53 is canceled and the HST lever 54 can be operated. The traveling machine body 1 can travel.

According to the above configuration, when the left and right preliminary seedling platforms 12b, 12c, and 12d are in the seedling replenishment posture protruding backward, the traveling machine body 1 is restrained from running, so the left and right preliminary seedling platforms 12b, 12c, and 12d It is safe because the riding rice transplanter can run only when it is in the proper position .

Claims (4)

The upper preliminary seedling stage (12d), the middle preliminary seedling stage (12c) and the lower preliminary seedling stage (12b) are configured, and the mutual preliminary seedling stage (12b, 12c, 12d) is linked to the link (26, 30, 38), and by rotating the links (26, 30, 38), the upper preliminary seedling stage (12d), the middle preliminary seedling stage (12c), and the lower preliminary seedling stage (12b) are predetermined in the vertical direction. and seedling box placement state apart intervals, the upper pre seedling stage and (12d) middle preliminary seedling stage and (12c) lower preliminary seedling stand seedling box mounting surface shaped long rails in one direction (12b) preliminary seedling stand configured to be switchable to the rail state forming conveying surface. The preliminary seedling stage according to claim 1, wherein the stopper (29) at the end of the preliminary seedling stage is retracted in conjunction with switching to the rail state . The preliminary seedling mounting stand according to claim 1 or 2, wherein the link (26, 30, 38) is in a rearwardly inclined posture in a seedling box mounting state, and is in a forwardly rising inclined posture in a rail state. After turning the link, the end portions of the mutual seedling placing bases (12b, 12c, 12d) are connected to each other by the connecting portions (39a, 39b) to switch to the rail state. The preliminary seedling stage according to any one of 3 above.

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