JP3236510B2 - Rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raising and lowering link mechanism at a rear position of a traveling body, which is provided with a seedling planting device which can freely roll around a longitudinal axis. A driving member is provided, and a pair of left and right springs connecting the driving member and the left and right positions of the seedling planting device are provided. Regarding the rice transplanter configured to be freely rollable, specifically, the seedling planting device is configured to be splittable, and the lateral dimension of the seedling planting device is reduced by changing the posture of the divided material around the vertical axis. The present invention relates to an improvement of a device configured to be switchable to a storage posture.

[0002]

2. Description of the Related Art Conventionally, there is a rice transplanter disclosed in Japanese Patent Laid-Open Publication No. Hei 6-46616 as a rice-transplanting machine constructed so as to be freely rotatable as described above. Japanese Unexamined Patent Application Publication No. 8-130935 discloses a rice transplanter configured so that the posture can be freely changed around it. Among the conventional examples, in the former, a seedling is planted at a rear end position of a link mechanism at a rear end of a traveling body. In addition to connecting the attachment device in a freely rotatable manner, the force from the female screw member that is sent in the screw-type lateral direction by the drive of the electric motor provided on the side of the link mechanism is applied to the vertical frame rod of the seedling planting device via a spring. It is configured to be able to roll the entire seedling planting device by transmitting
Further, in the latter of the conventional examples, the seedling planting device is configured so as to be able to be divided at an intermediate position in the left-right direction, and the divided material is rotated around an axis in a vertical posture, so that the traveling machine body is moved in the lateral direction of the divided material. The seedling-planting device is configured to be switchable to a retracted posture in which the width in the lateral direction is reduced by switching to the posture along the front-rear direction.

[0003]

Here, it is assumed that the seedling planting device is configured to be freely rollable as in the conventional example, and the seedling planting device is divided so as to be freely switchable to the storage position. Depending on the arrangement of the spring for rolling operation, pulling the spring when switching the seedling planting device to the retracted position,
It is also conceivable to increase the urging force of the spring to make the storing operation difficult. Also, when the seedling planting apparatus is divided and switched to the storage position in order to prevent such inconvenience,
It is conceivable to remove the spring prior to the switching operation, but it is troublesome, and it is desired that the planting device can be switched to the retracted posture while the spring is mounted.

[0004] An object of the present invention is to rationally construct a rice transplanter which can easily switch the seedling planting apparatus to the retracted position by reducing the action of the urging force of the rolling operation spring.

[0005]

According to a first aspect of the present invention, as described at the outset, a seedling plant can be freely rolled around a longitudinal axis at a rear link mechanism at a rear position of a traveling body. A drive member that is operated laterally by an actuator in the system of the elevating link mechanism, and a pair of left and right springs connecting the drive member and the left and right positions of the seedling planting device. In a rice transplanter in which the seedling planting device is configured to be freely rollable by transmitting the operating force in the direction via a spring, the seedling planting device is divided at a center position in the left-right direction, and the seedling planting device is divided around a vertical axis. By changing the posture, the left and right outer ends of the divided part are configured to be freely switchable to the storage posture toward the front of the traveling body, and a connecting member for connecting the end of the spring on the seedling planting device side, When the posture of the divided object is changed to the storage posture There in that is formed with flexible means to reduce the pulling operation of the spring, the action is as follows.

A second feature (claim 2) of the present invention is that the connecting member is arranged at a position close to the axis of the vertical posture in plan view, and the flexible means is disposed in the vertical posture. And a circular hole whose arc center coincides with the center of the shaft and is constituted by a long hole for locking the spring. The operation is as follows.

According to the first feature, when the divided object is switched to the retracted position, the accommodating means formed on the connecting member in accordance with the change in the posture of the divided member reduces the amount of operation of pulling the spring. Therefore, the biasing force from the spring does not act in a direction that hinders a change in the posture of the divided object in the storage direction. That is,
In the present invention, when the divided object is switched to the storage position, the action of the urging force from the spring is maintained at a small value without switching off the spring, and the switch to the storage position can be performed with a light operating force.

According to the second feature, when the divided object is switched to the retracted position, the spring is moved along an arc-shaped long hole centered on the axis of the vertical posture which enables the posture of the divided object to be switched. Since the locking portion moves, it is possible to prevent a phenomenon in which a tension acts on the spring due to the rotation about the axis.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a drive-type front wheel 1 and a drive-type rear wheel 2 that are steered.
The engine 4 is mounted on the front part of the traveling body 3 provided with the vehicle, and the hydrostatic stepless transmission 5 and the transmission case 6 are arranged at the front part of the traveling body 3 to transmit the power from the engine 4. In addition, a driver's seat 7 is disposed at the center of the traveling body 3, and a hydraulic cylinder 8 is provided at the rear end of the traveling body 3.
And a seedling planting apparatus A is connected via a link mechanism 9 driven up and down to form a riding type rice transplanter.

The right side of the driver's seat 7 is provided with a raising / lowering lever 10 for controlling the raising and lowering of the seedling planting apparatus A and the on / off operation of a planting clutch (not shown). A transmission lever 11 for operating the continuously variable transmission 5 is provided. The planting clutch is built in the transmission case 6 and permits the disengagement operation only when the transmission shaft 12 that transmits power from the transmission case 6 to the seedling planting device A is in a predetermined rotation phase. The planting arm (described later) of the seedling planting apparatus A is configured to shut off power in a posture avoiding contact with a field.

The seedling placement apparatus A includes a seedling table 13 on which a mat-shaped seedling W is placed, a pair of right and left transmission cases 14 and 14 to which power from the transmission shaft 12 is transmitted, and a chain case 15 from the transmission case 14. Rotary case 16 that is rotated by power transmitted through the power plant, planting arms 17 provided in pairs on the rotary case 16, a plurality of leveling floats 1
It has eight each and is configured for eight-row planting.

As shown in FIG. 8, the link mechanism 9 comprises a top link 9T and rear ends of a pair of left and right lower links 9L, 9L connected by a vertical link 9V.
The seedling planting apparatus A is connected to a removable intermediate frame 21 via a removable intermediate frame 21 (the structure of the removable seedling is not described in detail), and as shown in FIGS. Rolling axis Y in front and rear posture with respect to boss 22
The seedling planting device A is connected and supported so as to freely roll around,
Further, a screw shaft 24 is provided with a lateral posture that is driven to rotate by an electric motor 23 as an actuator with respect to the intermediate frame 21, and a driving member 25 screwed to the screw shaft 24 is guided by a guide rod 26. The driving member 2
A tension type rolling spring 29 is interposed between the seedling mounting table 13 and the connecting members 27A, 27A of the columnar frames 27, 27 disposed at the left and right positions of the seedling mounting table 13 via an extension member 28. . As shown in FIG. 5, the connecting member 27A is made of a rod material formed in an arc shape coaxial with the axis X2 of the columnar frame 27 in plan view. By locking the portion, when the seedling planting apparatus A is divided and switched to the storage position as described later, the divided object (described later) rotates integrally with the columnar frame 27 around the axis X2. In this case, the engaging portion of the rolling spring 29 moves in the circumferential direction along the arc-shaped long hole between the connecting member 27A and the outer periphery of the columnar frame 27, thereby reducing the tension acting on the rolling spring 29. It is configured so that it can be reduced. The arc-shaped long hole between the connecting member 27A and the columnar frame 27 constitutes the accommodating means F of the first and second aspects.

As shown in FIGS. 2 and 3, a pair of left and right engagement rods 3
0, 30 and brackets 31, 31 disposed on the right and left positions on the side of the seedling mounting table 13 opposite to the seedling mounting surface.
2 is provided with a tension type return spring 33 connected to the inner end. An operating shaft 34 having an upwardly projecting shape is welded and fixed to the right one of the extension rods 32 of the left and right return springs 33, 33, and the inner end of the extension rod 32 is artificially separated from the engagement rod 32. It is engaged so that it can be removed. Further, the right and left engaging rods 30 are integrally formed, and are bolted to the upper end of the intermediate frame 21 via the lower plate 30A, thereby forming the elongated hole 30B in the horizontal posture with respect to the plate 30A. The mounting positions of the engagement rods 30, 30 are configured to be freely adjustable in the lateral direction.
By drilling a hole 31A # that locks the ends of the holes 3A and 33, the mounting position of the engaging rods 30 and 30 in the lateral direction can be adjusted and the holes 31A and the return springs 33 and 33 can be engaged. It is configured that the return force to the seedling planting apparatus A can be adjusted by selection.

In this rice transplanter, the seedling planting apparatus A is configured so that it can be divided into two sections in four rows at the center in the left-right direction. That is, as shown in FIGS. 2, 4, 8, and 9, the main frame 36 is formed by the upper plate 36A and the lower frame 36B that are connected to the plate 35 that is rotatably connected to the rolling boss 22. And a pair of left and right regulating arms 37,
When the seedling planting device A is raised, the regulating arms 37 are brought into contact with the lower surfaces of the left and right lower links 9L, 9L so as to regulate the rolling operation of the seedling planting device A. It is composed. Further, a cylindrical frame member 41 is supported at both end positions of the main frame 36 so as to be swingable around the first axis X1 in a vertical orientation.
The column-shaped bracket 27 is pivotally supported at the pivoting end of the column-shaped frame 27 so as to be pivotable with the second axis X2 in the vertical position and the coaxial axis, and the channel-shaped bracket 42 is pivoted integrally with the column-shaped frame 27. The transmission case 14 and the square pipe-shaped tool frame 43 are connected to and supported by the bracket 42 to support the left and right divided parts AL and AR of the seedling planting apparatus A. Note that a support frame 44 in a lateral posture is disposed over the upper ends of the left and right columnar frames 27, 27.

As shown in FIGS. 2, 6 to 8, a bevel case 45 to which power from the transmission shaft 12 is transmitted via an intermediate shaft 12A is disposed at a position displaced rightward from the rolling shaft center Y. The bevel case 45 is provided with output shafts 46, 46 for branching and taking out the power in the left-right direction. The power from the output shafts 46, 46 is supplied to the clutch mechanisms C, C, the first intermediate shaft 47, and A transmission system for transmitting power to the left and right transmission cases 14 and 14 is formed through second intermediate shafts 49 having universal joints 48 and 48 disposed at both ends, respectively. Further, the clutch mechanisms C, C engage the shift member 50 which is spline-fitted slidably with respect to the output shaft 46, the engaging member 51 fixed to the end of the first intermediate shaft 47, and the shift member 50. And a compression spring 52 biasing in the direction of the member 51.
The occlusal claw 50A formed on the occlusal member 51 and the occlusal claw 50A formed on the occlusal member 51 are configured to occlude only in a specific rotation phase. Further, shifters 53, 53 which can be operated to contact the respective shift members 50, 50 so as to simultaneously operate the left and right shift members 50, 50 inward to simultaneously disengage the left and right clutch mechanisms C, C, are supported by the support shafts. A pin 56 is provided at the upper end position of the intermediate frame 21, which is swingably supported around 54, 54, and which is inserted into a long hole of an operation end of link members 55, 55 for simultaneously operating the shifters 53, 53. With the wire 58 interposed between the clutch release lever 57 and the lever 57, the clutch mechanisms C, C can be disengaged.

The left and right first intermediate shafts 47 are fixed to brackets 81 fixed to the left and right tool frames 43, 43, respectively.
Are rotatably supported via two bearing members D, D provided on the shaft and the shaft center Z between the output shaft 46 and the first intermediate shaft 47 in a state where the clutch mechanism C is connected. The bearing members D, D are provided with a flexible means for allowing the displacement of the one intermediate shaft 47 in a direction orthogonal to the axis Z. That is,
The bearing member D on the outer end side of the first intermediate shaft 47 is
And a rubber elastic plate 84 sandwiched between the holder 83 and the bracket 81. The end bearing member D is formed of a rubber elastic plate 84 having a circular opening formed in sliding contact with the outer surface of the first intermediate shaft 47.

As shown in FIG. 8, the seedling mounting table 13 is supported movably in the horizontal direction with respect to a pair of left and right sliding rails 60 in a horizontally long posture, and the left divided seedling mounting table 13L and The moving force of a top (not shown) engaged with the spiral groove of the screw shaft 61 which is configured to be separable from the right divided seedling mounting table 13R and is driven to rotate by the power of the left transmission case 14 is divided into the left divided. The moving member 62 is connected to the side of the seedling placing table 13L opposite to the seedling placing surface and is transmitted to constitute a lateral feed mechanism of the seedling placing table 13. A protection frame 63 having a shape surrounding the outer end of the slide rail 60 is connected and fixed to the outer end of the tool frame 43 so as to protect the outer end of the slide rail 60. Divided seedling rest 13L, 13R
Each of them is connected by a connecting mechanism described later, and reciprocates in the horizontal direction integrally on the slide rails 60 by the power from the transverse feed mechanism.

As shown in FIGS. 2 and 4, the first shaft X1
A rotating shaft 64 that rotates integrally with the frame member 41 is arranged on the same axis as the main shaft, and a main sprocket 65 is fixed to the rotating member 64. A member 66 is fixedly provided, and a driven sprocket 67 having half the number of teeth of the main sprocket 65 is fixedly mounted on the support frame 27 so as to be coaxial with the second axis X2, Further, a chain 68 is wound around the main sprocket 65 and the driven sprocket 67.

The left and right rotating members 66, 66 are arranged at a higher level than the left and right frame members 41, 41, and are suspended so that the rotating members 66, 66 respectively rotate integrally with the frame members 41, 41. One end of each of the rods 69 in the lowered position is fixedly welded to the rotating members 66, 66.
9 and 69 are connected to the frame member 41,
0, 70, and left and right rotating members 66, 6
An operating rod 71 is connected between each other so as to rotate the motors 6 in opposite directions.

As shown in FIG. 2, when the seedling planting apparatus A is in the working posture, in order to maintain this working posture, the first connecting mechanism S1 is placed at an upper position on the anti-seedling placing surface of the seedling placing stand 13. Formed at the connecting position of the support frames 44,44.
A coupling mechanism S2 is formed, and a third coupling mechanism S3 is formed between the lower surfaces of the left and right sliding rails 60, 60, and the seedling mounting table 1 is formed.
A fourth connecting mechanism S4 between the lower divided surfaces of the third unit 3;
As shown in FIG. 8, a connecting rod B is provided between the rear ends of the chain cases 15, 15 at positions sandwiching the dividing surface. Further, although the storing operation will be described later, as shown in FIG. 9, when the seedling planting apparatus A is set to the storage position, the regulating arms 37, 37 and the protection frame 6 are maintained to maintain the storage position.
A fifth connecting mechanism S5 is provided between the third connecting mechanism S3 and the third connecting mechanism S63.

The first to fifth connecting mechanisms S1 to S5 are configured to be freely switchable between a state in which members are pulled together and connected and a state in which members can be separated (the structure is not described in detail). ,
As shown in FIG. 8, the connecting rod B is configured so as to be freely detachable from left and right support plates 74, 74 which are connected and fixed such that both ends thereof extend rearward from the rear ends of the left and right chain cases 15. At the same time, the left and right support plates 74, 74 are drawn and fixed by operating the lever 75.

With such a configuration, when the seedling planting apparatus A is stored, the link mechanism 9 is operated to the highest position by the extension operation of the hydraulic cylinder 9 to separate the seedling planting apparatus A from the ground. In this state, the seedling table 13 is fed to the left end position by the driving force of the lateral feed mechanism as shown in FIG. 10 and stopped, and the operating shaft 34 of the extension rod 32 of the right return spring 33 is stopped.
, The inner end of the extension rod 32 is separated from the engagement rod 30 (see FIG. 2), and the clutch mechanisms C, C are disengaged by operating the clutch release lever 57 (FIG. 6).
), The first to fourth connecting mechanisms S1 to S4 are disconnected, and the connecting rod B is removed.

The extension rod 32 of the right return spring 33
The operation of manually operating the operation shaft 34 to separate it from the engagement rod 30 is for facilitating the manual movement operation of the right divided seedling mounting table 13R to be performed later, and the clutch release lever 57 is released. When operated to the position, the shift member 50 and the occlusal member 51 are completely separated as shown in FIG.

Next, as shown in FIG. 11, the right divided seedling mounting table 13R is artificially moved to the right moving end to lock the movement of the divided seedling mounting table 13R on the sliding rail 60. (In this state, the distance between the left and right divided seedling mounting tables 13R and 13L reaches about 30 cm). Thereafter, the outer end of the divided seedling mounting table of one of the divided objects is rotated by a manual operation in a direction toward the front side of the traveling machine body 3 so that the left and right rotating members 66, 66 and the rods 69, 69 are rotated. As the swinging ends of the left and right frame members 41, 41 rotate toward the rear of the traveling machine body 3 around the first axis cores X1, X1 by the force of The swinging end moves toward the center in the left-right direction of the traveling body 3, and at the same time, the system supported by the brackets 42, 42 around the second axis X 2, X 2 comprises the main sprocket 65 and the driven sprocket 67. Due to the force from the chain 68, the rotation direction of the frame members 41, 41 is opposite to the rotation direction of the frame members 41, 41 at twice the rotation speed of the frame members 41, that is, the left and right outer ends thereof are directed forward of the traveling body 3. As a result, the frame members 41, 4 The main frame 36
, The divided objects AL and AR rotate 180 degrees with respect to the frame members 41 and 41 (see FIG. 9).

In this rice transplanter, as shown in FIG. 14 (a), when the seedling planting apparatus A is in the working posture, the left and right rolling springs 29, 29 are in the most extended state, and are switched to the storage posture. Is completed, the distance between the driving member 25 of the rolling drive system and the left and right columnar frames 27, 27 is reduced, but at the time of this attitude switching, the divided parts AL, AR around the second axis X2, X2. Is rotated integrally with the columnar frame 27, the columnar frame 27 is provided with the connecting member 27A as described above so as not to pull the rolling springs 29, 29 by this rotation. As a result of the rolling spring 29 moving inside the arc-shaped long hole formed between the outer periphery of the columnar frame 27 and the connecting member 27A, the rolling spring 2
The switch to the storage position is performed by a light operation without pulling the 9.

Further, as shown in FIG. 12, at the time of turning to the storage position, the upper corner portions 13E and 13E of the left and right divided seedling mounts 13L and 13R approach each other, but the divided seedling mounts in plan view. 13L and 13R rotate at positions separated from each other, so that rotation can be made while avoiding contact with the respective corners 13E and 13E. When rotation is completed, the storage position is reached as shown in FIG. When the retracted position is reached, the connecting rod B removed as described above is held between the predetermined members of the left and right divided parts AL and AR by pulling both ends together as shown in FIG. Further, by operating the left and right fifth connecting mechanisms S5, the left and right divided objects AL and AR are prevented from rotating in the separating direction, and the storing operation is completed.

In this retracted position, the left and right divided seedling mounts 13L and 13R move on the sliding rails 60 and
At the position close to the side, the top edges reach parallel to each other in a close state, so that the weight of the entire seedling planting apparatus A is shifted toward the traveling machine body 3 to improve the weight balance of the entire rice planting machine, The size of the seedling planting device A in the horizontal direction is reduced.

When restoring the seedling planting apparatus A in the retracted position to the working position, the fifth connecting mechanism S5 on the left and right is separated, the connecting rod B is removed, and the left and right divided parts AL and AR are separated.
The left and right divisions AL and A are rotated by
R reaches the working posture, and in this posture, the first to third coupling mechanisms S
1 to S3 are connected and the clutch release lever 57 is restored to the on position, and it is confirmed that the bite claw 50A of the shift member 50 and the bite claw 51A of the bite member 51 bite in an appropriate posture, and that When the occlusion is not performed, an artificial operation is performed so as to be appropriate so that the occlusion is performed, and further, the right divided seedling mounting table 13R is moved to the left divided seedling mounting table 13L side, and then the fourth coupling mechanism is operated. S4 is connected, the second connecting mechanism S2 is connected, the first connecting mechanism S1 is connected, and the rear ends of the chain cases 15, 15 are connected with the connecting rod B. 33 extension rods 3
By performing the operation of engaging the engaging rod 2 with the engagement rod 30, the seedling planting apparatus A is restored to the working posture and reaches a workable state.
When the manual operation is performed to set the clutch mechanism C to the connected state, the first intermediate shaft 47 is supported by the bearing member D so as to be movable in a direction orthogonal to the axis Z, and therefore, FIG. As shown by an imaginary line in (a), even when the axis of the output shaft 46 does not coincide with the axis of the first intermediate shaft 47, the posture of the first intermediate shaft 47 is changed with a light operating force to change the position of the first intermediate shaft 47. 4
The biting claw 51A of the biting member 51 and the biting claw 50A of the shift member 50 provided at the end portion 7 can be set in a biting state.

As described above, in the present invention, the support frame 2
7 is provided with an arcuate connecting member 27A, and the end of the rolling spring 29 is locked to this connecting member 27A.
When rotating around the shaft cores X2 and X2 integrally with the shaft 7, the rolling spring 29 is prevented from being entangled in the columnar frame 27 and being pulled without operating to remove the rolling spring 29. The seedling placement device can be switched to the retracted position with a light operating force, and a light operating force is sufficient for restoring from the stored position to the working position.

[Another Embodiment] The present invention is not limited to the above-described embodiment. For example, as shown in FIG. It is also possible to configure the flexible means F with a connecting member 27A comprising a ring-shaped member 27t having a locking portion 27s so as to be rotatable about X2. In this configuration, the locking portion 27s is provided with a rolling spring 29. By locking the end, the ring-shaped member 27t rotates around the axis when the divided parts AL and AR rotate, so that the rolling spring 29 is not pulled (the same function as in the embodiment is performed). Those having the same reference numerals and symbols as those of the embodiment are assigned).

[0031]

Accordingly, a rice transplanter which can easily perform the operation of switching the seedling planting device to the storage position by reducing the action of the urging force of the rolling operation spring is rationally constituted. 1). Further, the switching operation of the seedling planting device to the storage position can be performed more easily with a light force only by improving the locking structure of the spring (claim 2).

[Brief description of the drawings]

FIG. 1 is an overall side view of a rice transplanter.

FIG. 2 is a rear view of a partially cut-out planting device.

FIG. 3 is a plan view showing a mounting structure of a return spring.

FIG. 4 is a plan view of a working posture and a stored posture of a rotary operation system of a divided object.

FIG. 5 is a plan view showing an arrangement of a rolling spring in a working posture and a storage posture.

FIG. 6 is a rear view of an operation system of the clutch mechanism.

FIG. 7 is a partially cutaway rear view showing the clutch mechanism in the off state and the on state.

FIG. 8 is a plan view showing a schematic structure of a seedling planting apparatus in a working posture.

FIG. 9 is a plan view showing a schematic structure of a seedling planting device in a storage position;

FIG. 10 is a plan view of a rice transplanter in a state where a seedling mounting table of the seedling transplanting apparatus is moved to one end.

FIG. 11 is a plan view of a rice transplanter in a state where a seedling mounting table of the seedling transplanter is divided.

FIG. 12 is a plan view of the rice transplanter in a state where the divided parts of the seedling planting apparatus are rotated.

FIG. 13 is a plan view of a rice transplanter in which the seedling planting device is set in a retracted position.

FIG. 14 is a plan view showing another embodiment of the arrangement of the rolling spring in the working posture and the storage posture.

[Explanation of symbols]

 Reference Signs List 3 traveling machine body 9 elevating link mechanism 25 drive member 27A connecting member 29 spring A seedling planting device AL, AR divided material F accommodating means X2 shaft center Y front and rear shaft center

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A01C 11/02 350-366 A01C 11/02 320

Claims (2)

(57) [Claims] 1. A raising and lowering link mechanism at a rear position of a traveling body is provided with a seedling planting device so as to be rollable around a longitudinal axis, and a driving member which is actuated laterally by an actuator is provided in a system of the raising and lowering link mechanism. A pair of left and right springs connecting the driving member and the left and right positions of the seedling planting device are provided, and the actuation force of the driving member in the left and right direction is transmitted via the spring, so that the seedling planting device is configured to be freely rollable. A rice transplanter, wherein the seedling planting device is divided at a center position in the left-right direction, and the posture is changed around the axis of the vertical posture, so that the left and right outer ends of the divided part are directed forward of the traveling body. And a connecting member for connecting the end of the spring on the side of the seedling planting device with a connecting means for reducing the amount of pulling operation of the spring when the posture of the split is changed to the storage posture. A rice transplanter that has been formed. 2. The apparatus according to claim 1, wherein the connecting member is disposed at a position close to the axis in the vertical position in plan view, and the accommodating means is a circle whose center of an arc coincides with the axis in the vertical position. 2. The rice transplanter according to claim 1, wherein the rice transplanter is constituted by an elongated hole that locks the spring in an arc shape.