JP2024033726A - Transplanter - Google Patents

Abstract

To provide a transplanter which can raise a land roller for leveling irregularities on a ridge surface in turning, while having a simplified structure.SOLUTION: To a rotation cam which is fitted to the vicinity of a left end and/or a right end of a support rod extending in a lateral direction of a transplanter, in a manner in which the rotation cam can rotate around the support rod, a front end part of a lift arm, and left and right side parts and/or one side part of them of a suppression frame which is formed in a substantially U shape and whose opening is directed rearward in plan view, are coupled, and when the lift arm is moved rearward in linkage with raising of a vehicle height of a travel vehicle body, the rotation cam rotates around the support rod in a clockwise rotation direction in left side view, and the suppression frame coupled to the rotation cam rotates around the support rod in a clockwise rotation direction in left side view, thereby raising the suppression roller.SELECTED DRAWING: Figure 4

Description

The present invention relates to a transplanter for planting transplants such as vegetable seedlings, potato seed potatoes, and bulbs such as radish in a field.

Conventionally, a pressure roller is placed at the front of a transplanter that transplants transplanted items such as seedlings, seed potatoes, bulbs, etc. into the field, and is rolled over the ridge surface (the top surface of the ridge) to even out unevenness of the ridge surface. things are known. By smoothing out unevenness on the ridge surface using a pressure roller, the planting depth of the transplant can be stabilized. Generally, in order to prevent the transplanter from touching the ridge when turning to move to the next ridge, the operator lowers the rear wheels to raise the vehicle height and then places the machine at the rear end of the machine. By pushing down on the control handle, the front of the aircraft can be raised. However, when the pressure roller is disposed at the front of the machine, it is necessary to press down the control handle significantly to prevent the pressure roller from coming into contact with the ridges, which is a burden on the operator.

On the other hand, in the transplanting machine described in Patent Document 1, the front wheel disposed at the front of the machine body is raised and lowered by a lifting mechanism including an actuator such as a motor. The arm supporting the pressure roller is wound up by a wire in conjunction with the elevation of the front wheel, so that the pressure roller is rotated up and down. With this configuration, when the aircraft turns, the suppression roller is automatically rotated upward as the front wheels are raised by the drive of the actuator, reducing the burden on the operator to press down on the control handle. .

Japanese Patent Application Publication No. 2021-185823

However, the configuration described in Patent Document 1 requires an elevating mechanism that allows the front wheels to rise and fall in addition to the conventionally provided elevating mechanism for the rear wheels, which complicates the structure of the aircraft and also There was a problem that the weight of the front part became heavy.

In light of these circumstances, an object of the present invention is to provide a transplanting machine that, even with a simple configuration, can raise a pressing roller that smooths out unevenness on a ridge surface when turning. .

Such an object of the present invention is to
A transplanter for planting transplants in a field,
A running vehicle body configured to be able to raise and lower the vehicle height;
a planting device for transplanting transplants into a field;
a support rod attached to the bumper of the traveling vehicle body and extending in the left-right direction;
a suppressing frame having a substantially U-shape with the open portion facing rearward in plan view, and having left and right rear end portions rotatably mounted near the left and right end portions of the support rod;
a pressing roller rotatably attached to the left and right center portions of the pressing frame, and smoothing unevenness of the ridge surface;
a rotary cam mounted near the left and/or right end of the support rod so as to be rotatable about the support rod;
and a lift arm that is moved back and forth in conjunction with the elevation and descent of the vehicle height of the traveling vehicle body,
The rotating cam is configured such that the front end of the lift arm is connected to both left and right sides of the suppression frame and/or to one side of the left and right side, and rotates the lift in conjunction with an increase in the vehicle height of the traveling vehicle body. When the arm is moved rearward, it is configured to rotate clockwise around the support rod when viewed from the left side, and as a result, the suppression frame connected to the rotation cam rotates around the support rod. A transplanting machine characterized in that the pressure roller rises by rotating clockwise when viewed from the left side.

According to the present invention, the lift arm is moved rearward as the vehicle height of the traveling vehicle body is raised, and the rotating cam to which the front part of the lift arm is connected is thereby rotated. The suppression frame, which is also connected to the rotation cam, is rotated upward about the support rod. Therefore, in addition to the mechanism for adjusting the vehicle height of the traveling vehicle, the pressure roller can be raised in conjunction with the increase in vehicle height without providing a separate actuator such as a motor, so even if the configuration is simple, , the pressure roller can be raised when turning.

Further, according to the present invention, since the suppression frame to which the suppression roller is attached is rotatably attached to the support rod, the suppression frame naturally rotates forward and downward due to the weight of the suppression roller and the suppression frame. be done. Therefore, even if the suppression frame is temporarily rotated upward due to a convex part of the ridge, a stone, etc., the posture of the suppression frame can be returned to the forward and downward position naturally, and the planting depth can be stabilized. .

In a preferred embodiment of the invention,
comprising a pair of left and right guide rollers that guide the traveling vehicle body to travel along the ridges of the field by contacting the left and right slopes of the ridges;
The pair of left and right guide rollers each include a frame-shaped guide holder that is fixed to the support rod so that its left and right positions can be adjusted, and a roller arm that is connected to the guide holder so that it can rotate up and down and slide left and right. and a roller member fixed to the front part of the roller arm and in contact with either the left or right slope of the ridge,
A guide hole is formed on the front surface of each guide holder to limit the rotation angle and horizontal position of the roller arm. located above the guide holder and extending from the inside of the guide holder to the front of the guide holder through the guide hole,
The guide hole includes an upper penetrating portion extending diagonally inward and downward in the width direction of the fuselage, and a lower penetrating portion extending diagonally outward and downward in the width direction of the fuselage from the lower end of the upper penetrating portion. The guide hole as a whole has a substantially doglegged shape when viewed from the front.

According to this preferred embodiment of the present invention, the roller arm supporting the roller member that contacts the slope of the ridge is connected to the guide holder so as to be able to rotate up and down, and the suppression frame is equipped with the suppression roller. Since it is located above, when the suppression roller is rotated upward in conjunction with the rise in vehicle height, the left and right roller arms are pressed by the suppression frame and rotated upward, causing the left and right rollers to rotate upward. The member rises. Therefore, it is possible to prevent the pair of guide rollers from coming into contact with the ridges and causing the ridges to collapse when the machine body turns.

Furthermore, according to this preferred embodiment of the present invention, the lower penetrating portion of the guide hole of the guide holder that limits the left-right position and rotation angle of the roller arm has a shape that extends diagonally outward and downward in the width direction of the machine body. I am doing it. In other words, the lower penetrating portion extends in a direction substantially perpendicular to the force applied from the slope of the ridge. Therefore, when the roller arm is rotated downward by its own weight and the weight of the roller member and is pushed back from the slope of the ridge at a position where it passes through the lower penetration part, the roller arm is rotated downward from the upper part. It is suppressed by the lower end of the corner formed between the penetrating part and the lower penetrating part. Therefore, it is possible to prevent the roller member from frequently leaving the slope of the ridge during the transplanting operation.

In addition, when a strong impact is applied to each roller member due to contact with a stone or the like located on the slope of a ridge, the roller arm can escape to the upper penetration part, thus preventing damage to the guide roller. be able to.

Further, according to this preferred embodiment of the present invention, when the vehicle height of the traveling vehicle body is lowered after the aircraft turns, the suppression frame rotates forward and downward as the lift arm is moved forward. Then, each roller member and roller arm move downward and inward in the width direction of the machine body along the guide hole due to their own weight. Therefore, when the vehicle height of the traveling vehicle body is lowered, the pair of roller members can be fitted naturally to the slope of the ridge.

Further, according to this preferred embodiment of the present invention, since the pair of left and right guide rollers are configured to be able to adjust the left and right positions, it is possible to adjust the left and right distance between the pair of guide rollers according to the ridge width. This makes it possible to prevent the planting position by the planting device from being disturbed from side to side.

In a further preferred embodiment of the invention,
The traveling vehicle body includes a pair of left and right crawlers,
The crawler is provided with a swing frame that is swingably disposed at the rear lower part of the crawler on each of the left and right sides, and a front wheel is arranged at the front part of the swing frame, and a rear road wheel is arranged at the rear part of the swing frame. Ori,
The rear wheel includes an inner wheel located inside the swing frame in the width direction of the aircraft body, and an outer wheel located outside the swing frame,
The outer rolling wheel includes a hub located at the center in the radial direction, a rim located at the outer periphery, and three spokes extending from the hub to the rim,
The rim is formed in a tapered shape so as to move away from the hub toward the outside in the width direction of the aircraft body,
The three spokes are arranged at 120° intervals in the circumferential direction of the hub, and are located outside the inner end of the rim and the inner end of the hub in the width direction of the aircraft body. ing.

According to this preferred embodiment of the present invention, since the three spokes of the outer wheel are arranged at equal intervals (120° intervals), a large space can be provided between the spokes, and the outer wheel Mud that has entered between the spokes and the swinging frame can be released from between the spokes to the outside of the aircraft. In addition, the three spokes are located further outward in the width direction of the fuselage than the inner end of the rim and the inner end of the hub, making it difficult for mud to escape to the outside of the fuselage.

Furthermore, since the rim located on the outer periphery of the outer wheel is tapered so that it moves away from the hub as it goes outward in the width direction of the aircraft, mud etc. may adhere to the inside part of the rim in the radial direction. Even in such a case, since mud and the like slide along the outer surface of the tapered rim in the width direction of the machine body, it is possible to effectively prevent mud and the like from accumulating between the swing frame and the outer wheel. Therefore, it is possible to prevent damage to the rear wheels, which are located at the lower rear of each crawler and are easily subjected to loads during running.

In a further preferred embodiment of the invention,
The hub and the three spokes are each formed such that the vertical dimension of the inner end portion in the width direction of the body is larger than the vertical dimension of the outer end portion.

According to this preferred embodiment of the invention, the hub and three spokes of the outer wheel each have a dimension in which the vertical dimension of the inner end in the width direction of the fuselage is larger than the vertical dimension of the outer end, e.g. Because it is formed in a triangular or trapezoidal shape when viewed in longitudinal section, mud, etc. on the hub and spokes can be dropped to the outside of the aircraft due to vibrations during running, and mud, etc. can be shaken with the rear wheels. You can prevent the situation from falling between the frame and the frame.

In a further preferred embodiment of the invention,
The rear rolling wheel includes a shaft body extending in the width direction of the aircraft body and connecting the outer rolling wheel and the inner rolling wheel,
The inner roller is configured to be slidable along the shaft, and includes a hub located at the center of the inner roller in the radial direction,
The radially outer portion of the hub has a shape that protrudes inward in the width direction of the fuselage, thereby forming an accommodation space on the radially inner side,
A spring that urges the inner roller outward in the width direction of the machine body is housed in the housing space.

According to this preferred embodiment of the present invention, the inner roller is configured to be slidable along the shaft body, and the inner roller is urged by the hub of the inner roller to the outside in the width direction of the fuselage. Because a spring is installed to prevent the inner roller from being attached to the spring, if dirt or stones enter between the inner roller and the swing frame and an excessive load is applied to the inner roller, It is possible to slide inward in the width direction of the fuselage against the force, reducing the load on the inner wheels. Furthermore, at this time, since the gap between the inner roller and the swing frame can be widened, intruding substances such as mud can be discharged downward.

In addition, after the intruder is discharged, the inner roller can be returned to the outside in the width direction of the machine body by the biasing force of the spring 59, so that subsequent intrusion of mud and the like can be suppressed.

According to the present invention, even with a simple configuration, it is possible to provide a transplanting machine that can raise the position of the pressure roller for leveling the unevenness of the ridge surface when turning.

FIG. 1 is a schematic left side view of a transplanter according to a first embodiment of the present invention. FIG. 2 is a schematic plan view of the transplanter shown in FIG. 1. FIG. 3 is an enlarged plan view of the vicinity of a bumper arranged at the front of the vehicle body. FIG. 4 is an enlarged left side view of the vicinity of a bumper arranged at the front of the vehicle body. FIG. 5 is a drawing showing the tip of the water absorption hose. 6 is a schematic left side view of the vicinity of the base portion of the main clutch lever shown in FIG. 1. FIG. FIG. 7 is a schematic left side view of a left crawler provided in a transplanter according to a second embodiment of the present invention. FIG. 8 is a schematic perspective view of the vicinity of the swing frame of the left crawler. FIG. 9 is an enlarged left side view of the vicinity of the outer roller of the rear roller of the left crawler. FIG. 10 is a partial vertical cross-sectional view of the vicinity of the hub of the outer wheel taken along the line XX shown in FIG. FIG. 11 is a horizontal cross-sectional view of the vicinity of the outer wheel along the YY line shown in FIG. FIG. 12 is a schematic rear view of the vicinity of the inner roller of the rear roller of the left crawler. FIG. 13 is a schematic perspective view showing a state in which the spring provided on the inner roller shown in FIG. 12 is exposed.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.
FIG. 1 is a schematic left side view of a transplanter 1 according to a first embodiment of the present invention, and FIG. 2 is a schematic plan view of the transplanter 1 shown in FIG. 1.

In this specification, unless otherwise specified, the side in the direction of movement of the transplanter 1 is referred to as the "front", the opposite side is referred to as the "rear", and the left side toward the front, which is the direction of travel of the transplanter 1, is referred to as the "front". The opposite side is called the "left" and the opposite side is called the "right." Although the transplanting machine 1 according to the present embodiment is configured to be able to transplant sweet potato seedlings as a transplant into a field, the type of transplant to be transplanted into a field is not limited to this.

The transplanting machine 1 includes a traveling vehicle body 10 (hereinafter also simply referred to as "vehicle body") that moves the machine forward, and a conveyor body 10 that is attached to the vehicle body 10 and that transports seedlings set in a seedling holder 7 by an operator to the lower part of the machine body. A device 4, a planting device 3 that transplants seedlings transported by the transport device 4 to a field by repeating a planting operation, a suppressing roller 5 and a pair of left and right guide rollers 6 disposed in front of a vehicle body 10, and a vehicle body. The vehicle includes a pair of left and right suppression wheels 21 provided at the rear of the vehicle body 10, and a control handle 16 attached to a body frame 17 provided at the rear of the vehicle body 10. Note that in this specification, the term "machine" refers to a transplanted machine.

The traveling vehicle body 10 includes an engine 11 as a power source of the aircraft, a mission case 12 that changes the speed of the rotational power output from the engine 11, a pair of left and right rear wheels 9 as driving wheels, and a pair of left and right idle wheels. It has 8 front wheels.

The power changed in speed by the mission case 12 is transmitted to the transport device 4 and the planting device 3 via the first transmission device 25 and the second transmission device 26, and is also transmitted to the axle 13 and the planting device 3, which are mounted on the mission case 12. The power is transmitted to a pair of rear wheels 9 via a pair of left and right chain cases 14. As a result, the pair of rear wheels 9 are rotated to move the vehicle body 10 forward, and at the same time, the transport device 4 is intermittently rotated, so that the seedlings are transported to a position that overlaps the trajectory of the planting operation of the planting device 3. , is scraped off by the planting device 3 that repeats the planting operation and transplanted to the ridge P of the field.
The pair of compression wheels 21 compress the topsoil after transplantation by freely rolling the ridges as the vehicle body 10 travels.

The control handle 16 includes a main clutch lever 18 used to disengage a main clutch that connects and disconnects power transmission to the vehicle body 10, the conveyance device 4, and the planting device 3, and a main clutch lever 18 used to adjust the vehicle height of the vehicle body 10. A planting lifting lever 19 and the like are arranged.

Lifting arms 20 extending upward are integrally attached to the attachment portions of the pair of chain cases 14 to the transmission case 12, respectively. The left lifting arm 20 is attached to the left end of a balance rod 23 that is rotatably attached to the tip of the piston rod of the lifting hydraulic cylinder 70 (see FIG. 2) fixed to the mission case 12 around the vertical axis. , are connected by a horizontal control hydraulic cylinder 15. On the other hand, the right lifting arm 20 is connected to the right end of the balance rod 23 by a connecting rod 24.

When the piston rod of the lifting hydraulic cylinder 70 protrudes rearward by operating the planting lifting lever 19, the pair of lifting arms 20 is rotated backward (specifically, clockwise when viewed from the left side). As a result, the pair of chain cases 14 are rotated downward around the axle 13 (specifically, clockwise when viewed from the left side), and the pair of rear wheels 9 are lowered. As a result, the vehicle height of the vehicle body 10 increases.

On the other hand, when the piston rod of the lifting hydraulic cylinder 70 is housed forward by operating the planting lifting lever 19, the pair of lifting arms 20 moves forward (in detail, counterclockwise in the left side view). Rotated. As a result, the pair of chain cases 14 are rotated upward around the axle 13 (specifically, counterclockwise when viewed from the left side), and the pair of rear wheels 9 is raised. As a result, the vehicle height of the vehicle body 10 is lowered. The left lifting arm 20 is connected to the rear end of a lift arm 30, which will be described in detail later.

3 is an enlarged plan view of the vicinity of the bumper 2 disposed at the front of the vehicle body 10, and FIG. 4 is an enlarged left side view of the vicinity of the bumper 2 disposed at the front of the vehicle body 10. . More specifically, FIG. 4(a) is an enlarged left side view of the vicinity of the bumper 2 during planting work, and FIG. 4(b) is an enlarged left side view of the vicinity of the bumper 2 during planting work, and FIG. FIG. 2 is an enlarged left side view of the vicinity of the bumper 2. FIG. A schematic front view of the guide holder 6c, which will be described in detail later, is shown in the balloon drawn with broken lines in FIG.

A support rod 27 extending in the width direction (=lateral direction) of the vehicle body is attached to the bumper 2 of the traveling vehicle body 10. The support rod 27 is a member that has a hexagonal shape in a longitudinal cross-sectional view at the center in the width direction, and a circular shape in the vicinity of the left and right ends in a longitudinal cross-sectional view. Near the left and right ends of the support rod 27, left and right rear ends 28b1 of a suppressing frame 28, which is approximately U-shaped in plan view, are rotatably mounted. Supported.

The suppression frame 28 includes a support portion 28a extending in the width direction (=left-right direction) of the aircraft body, and a pair of left and right base portions 28b extending from both left and right ends of the support portion 28a to the rear support rod 27, and the open portion is shown in plan view. It is placed towards the rear. Note that the open portion refers to a gap in the left-right direction between the rear portions of the pair of base portions 28b. A pressure roller 5 is rotatably attached to the left and right center portions of the support portion 28a, and the pressure roller 5 smooths the unevenness of the ridge surface by rolling on the ridge surface (the upper surface of the ridge P). is rotatably supported.

In addition to the suppressing frame 28, the support rod 27 includes a pair of left and right guide rollers 6 that guide the vehicle body 10 to travel along the ridge P by contacting the left and right slopes of the ridge. A rotary cam 29 is installed to rotate the suppression frame 28 upward when the vehicle height is raised. The rotating cam 29 is rotatably mounted near the left end of the support rod 27, which has a circular shape in longitudinal section.

Here, the rotating cam 29, the left base 28b of the suppression frame 28, and the front end of the lift arm 30 are connected by a connecting pin 31 extending left and right. When the vehicle height of the vehicle body 10 is raised (a certain level or more) and the pair of lifting arms 20 are rotated clockwise in the left side view as shown in FIG. is pulled and moved backwards. As a result, the rotating cam 29 is rotated clockwise about the support rod 27 when viewed from the left side, and the position of the connecting pin 31 is moved higher than before the vehicle height of the vehicle body 10 was raised. As a result, the suppressing frame 28 is rotated upward around the support rod 27, and the suppressing roller 5 is raised.

In this way, when the vehicle height of the vehicle body 10 is raised, the pressure roller 5 is raised in conjunction with the rise, so that the situation where the pressure roller 5 comes into contact with the ridge P and the ridge P collapses when the aircraft turns is prevented. It can be prevented. In addition, since the pressing roller 5 is raised, the pressing roller 5 does not get in the way when turning to the adjacent ridge P.

On the other hand, the pair of left and right guide rollers 6 each include a frame-shaped guide holder 6c fixed to the support rod 27, a roller arm 6b connected to the guide holder 6c, and a roller fixed to the front part of the roller arm 6b. A member 6a is provided. When the vehicle body 10 travels while transplanting seedlings by the planting device 3, the roller member 6a of the left guide roller 6 contacts the left slope of the ridge P, and the roller member 6a of the right guide roller 6 contacts the slope of the ridge P. By contacting the slope on the right side, the vehicle body 10 can be guided to run along the ridge P.

A fixing hole (not shown) is formed in the support rod 27 at the rear of each guide holder 6c. Each guide roller 6 is inserted by inserting a butterfly bolt or a push bolt in a state where the hole is aligned with one of a plurality of through holes (not shown) formed in the support rod 27 and lined up in the left and right direction. The left and right positions of can be fixed. That is, each guide holder 6c is fixed to the support rod 27 so that its left and right positions can be adjusted. Note that it is not necessarily necessary to provide a plurality of through holes in the support rod 27, and a hook for hooking on the support rod 27 is provided on the lower surface of each guide holder 6c, and a fixing hole formed at the rear of each guide holder 6c is provided. By pressing a butterfly bolt or push bolt against the support rod 27 through the corresponding hole, the lateral position of each guide roller 6 may be changed steplessly.

The inside of each frame-shaped guide holder 6c is hollow, and a shaft body 6c1 extending in the left-right direction is passed therethrough. The roller arm 6b of each guide roller 6 is connected to the shaft body 6c1 so as to be rotatable up and down and slidable left and right. This connecting portion is provided with a slight play, and it is also possible to move the roller arm 6b slightly diagonally with respect to the shaft body 6c1.

A guide hole 6c2 is formed on the front surface of each guide holder 6c, and the roller arm 6b is inserted from the inside of the guide holder 6c through the guide hole 6c2. It extends forward of the guide holder 6c. Therefore, the roller arm 6b can rotate vertically and slide horizontally only in the direction in which the guide hole 6c2 extends, and the guide hole 6c2 controls the vertical rotation angle and the horizontal position of the roller arm 6b. It serves a restrictive function. In other words, the guide hole 6c2 has a function of defining the vertical rotation angle and the horizontal position of the roller arm 6b.

As shown in the speech balloon drawn with broken lines in FIG. 3, the guide hole 6c2 has an approximately L-shape as a whole (in other words, an approximately "dog" shape) or an approximately inverted L-shape when viewed from the front. (In other words, it has an almost inverted "dog" shape). More specifically, the guide hole 6c2 includes an upper penetrating portion 6c2a that extends diagonally inward in the width direction of the fuselage as it goes lower, and a lower end of the upper penetrating portion 6c2a extending outward in the width direction of the fuselage. It includes a lower penetrating portion 6c2b that bends downward (extends to =). Therefore, a corner 6c2c formed by an upper penetrating portion 6c2a and a lower penetrating portion 6c2b is formed on the front surface of each guide holder 6c. In other words, the upper penetrating portion 6c2a extends diagonally inward and downward in the width direction of the body, and the corner portion 6c2c is, in other words, a protruding portion that protrudes toward the guide hole 6c2.

Since the roller arm 6b is naturally rotated downward around the shaft body 6c1 due to its own weight and the weight of the roller member 6a, it basically passes through the lower end of the guide hole 6c2 when traveling while planting seedlings. Rotation angle and left/right position. While the vehicle body 10 is running, a force is applied to the roller arm 6b and the roller member 6a that pushes them back from the slope of the ridge P, that is, a force that presses them diagonally upward and outward in the width direction of the vehicle body. However, the lower penetrating portion 6c2b extends in a direction substantially perpendicular to the direction of this pressing force, and the lower end of the upper corner 6c2c of the lower penetrating portion 6c2b is attached to the roller arm 6b attempting to escape upward. This creates resistance, and the roller arm 6b is suppressed by the corner 6c2c. In addition, as can be seen from FIG. 4(a), the shaft body 6c1 (see FIG. 3), which is the center of rotation, is the (acting part) when the roller arm 6b is at the lower end of the guide hole 6c2. It is set at a position above the roller member 6a. Therefore, it is possible to prevent the roller member 6a from frequently leaving the slope of the ridge P during the transplanting operation. Furthermore, if an excessively strong force is applied to the roller member 6a and the roller arm 6b due to stones or the like existing on the slope of the ridge P, the roller arm 6b can be moved from the lower penetration part 6c2b of the guide hole 6c2 to the upper penetration part. Therefore, damage to the roller member 6a, roller arm 6b, and guide holder 6c can be prevented.

As can be seen from FIGS. 3 and 4, each roller arm 6b extends substantially forward above the support portion 28a of the suppression frame 28. Therefore, when the height of the vehicle body 10 is raised above a certain level and the suppression frame 28 is rotated upward around the support rod 27, each roller arm 6b is moved upward by the support portion 28a of the suppression frame 28. It is pressed and rotated upward around the shaft body 6c1. In this way, when the vehicle height of the vehicle body 10 is raised above a certain level, in addition to the suppression roller 5, the roller members 6a of the pair of left and right guide rollers 6 are also raised, so that when the vehicle body turns, the roller members 6a are raised. A situation in which the ridge P collapses due to contact with the ridge P can be prevented.

At this time, since the roller arms 6b of each guide roller 6 are rotated and slid upward and outward in the width direction of the machine body along the upper penetration portion 6c2a, the distance between the roller members 6a of the left and right guide rollers 6 is reduced. is expanded. Therefore, after the machine body turns, it is easy to position the left and right roller members 6a on the left and right sides of the ridge P.

Further, when the vehicle height of the traveling vehicle body 10 is lowered after the aircraft has turned, the roller arms 6b of each guide roller 6 rotate and slide downward and inward in the width direction of the aircraft along the upper penetration portion 6c2a. Therefore, the pair of roller members 6a can be naturally fitted to the slope of the ridge P.

Moreover, since the pressing roller 5 moves up and down by the rotation of the pressing frame 28 about the support rod 27, the pressing roller 5 can be made to follow the ridge surface even if the height of the ridge P changes.

Further, since the upper surface of the ridge P can be pressed down by the pressure roller 5 and the slope of the ridge P can be pressed down by the pair of left and right roller members 6a, followability is good and the traveling vehicle body 10 can be reliably guided in the direction in which the ridge P extends. be able to.
On the other hand, FIG. 5 is a drawing showing the tip of the water absorption hose 38. As shown in FIG.

The transplanter 1 is equipped with an irrigation tank (not shown), and each time the planting operation of the planting device 3 is performed, water sent from the irrigation tank is supplied to the field from the planting claw 3a (see Fig. 1). be done. The end of a water absorption hose 38 shown in FIG. 5 is inserted into the water stored in this irrigation tank, and a filter 39 is attached to the end of the water absorption hose 38 using a hose band 40. The water sucked up through the side surface is supplied to the planting nails 3a through the water supply path. In this way, by sucking up the water in the irrigation tank through the filter 39, it is possible to prevent foreign substances other than water contained in the irrigation tank from being sent to the water supply path. A cap 41 is provided at the tip of the filter 39 to prevent the filter 39 from being rubbed against the bottom of the tank, thereby protecting the filter 39.

A spring 42 for tensioning the filter 39 is extended inside the filter 39. As the diameter of the spring 42 is shown by the broken line in FIG. 5, the diameter of the portion of the spring 42 extending inside the filter 39 located inside the cap 41 is larger than the diameter of the other portion. With this configuration, the cap 41 becomes difficult to come off from the filter 39.

A weight 43 indicated by a dashed line is housed inside the tip of the filter 39 and inside the cap 41 . Thereby, the tip of the water absorption hose 38 can be reliably submerged in the water stored in the irrigation tank, and water can be stably supplied to the planting nails 3a.

FIG. 6 is a schematic left side view of the vicinity of the root portion of the main clutch lever 18 shown in FIG. FIG. 6(a) shows the state before the main clutch lever 18 is rotated, and FIG. 6(b) shows the state after the main clutch lever 18 is rotated. has been done.

Approximately below the main clutch lever 18, there is a first plate 32 and a right side of the first plate 33 for transmitting the rotational operation of the main clutch lever 18 (see the arrow shown in FIG. 6(a)) to the main clutch. A second plate 33 is provided (on the back side of the drawing).

The first plate 32 has a curved shape so as not to interfere with a tube 35 into which a knob bolt 34 (see FIG. 1) for adjusting the angle of the operating handle 16 is inserted. This can prevent the first plate 32 from interfering with and damaging the tube 35 when the main clutch lever 18 is rotated.

When the main clutch lever 18 is rotated, the second plate 33 is pulled forward by the cable 37 (see FIG. 6(b)) connected to the second plate 33, and the second plate 33 is pulled forward around the rotation center 36. The plate 33 is rotated clockwise when viewed from the left side. Note that in FIG. 6A, the cable 37 and the like are omitted to show the connecting portion of the cable 37 to the second plate 33.

While the main clutch lever 18 is being rotated, as shown in FIG. 6, the first plate 32 and the second plate 33 always overlap in side view and operate while abutting each other left and right. This can prevent the end surfaces of the first and second plates 32 and 33 from coming into contact with each other and locking the operation.
<Technical significance of the first embodiment>

According to the first embodiment shown in FIGS. 1 to 6, the lift arm 30 is moved rearward as the vehicle height of the traveling vehicle body 10 is raised, and as a result, the front part of the lift arm 30 When the rotating cam 29 connected by the connecting pin 31 rotates clockwise in the left side view, the suppressing frame 28 also connected to the rotating cam 29 is rotated upward around the support rod 27. Ru. Therefore, in addition to a mechanism for adjusting the vehicle height of the traveling vehicle body 10, the suppression roller 5 can be raised in conjunction with the increase in vehicle height without providing a separate actuator such as a motor, resulting in a simple configuration. However, the pressing roller 5 can be raised when turning.

Further, according to the first embodiment, since the suppression frame 28 on which the suppression roller 5 is mounted is rotatably mounted on the support rod 27, the weight of the suppression roller 5 and the suppression frame 28 causes the suppression frame 28 to be rotated. is naturally rotated forward and downward. Therefore, even if the suppression frame 28 is temporarily rotated upward due to a convex portion of a ridge, a stone, etc., the posture of the suppression frame 28 can be returned to the forward and downward position naturally, and the planting depth can be stabilized. Can be done.

In addition, according to the first embodiment, the roller arm 6b that supports the roller member 6a that contacts the slope of the ridge P is connected to the guide holder 6c so as to be rotatable up and down, and the pressure roller 5 is Since it is located above the support part 28a of the mounted suppression frame 28, when the suppression roller 5 is rotated upward in conjunction with the rise in vehicle height, the left and right roller arms 6b are pressed by the suppression frame. and rotated upward, and each roller member 6a rises. Therefore, it is possible to prevent the pair of guide rollers 6 from coming into contact with the ridges P and causing the ridges P to collapse during turning.

Further, according to the first embodiment, the lower penetrating portion 6c2b of the guide hole 6c2 of the guide holder 6c that limits the left-right position and rotation angle of the roller arm 6b has a shape that extends diagonally outward and downward in the width direction of the machine body. is doing. In other words, the lower penetrating portion 6c2b extends in a direction substantially perpendicular to the force applied from the slope of the ridge P. Therefore, when the roller arm 6b at the position where it passes through the lower penetration part 6c2b is pushed back from the slope of the ridge P due to its own weight and the weight of the roller member 6a, the roller arm 6b moves to the upper penetration part 6c2b. It is suppressed by the lower end of the corner 6c2c formed between the corner 6c2a and the lower penetrating portion 6c2b. Therefore, it is possible to prevent the roller member 6a from frequently leaving the slope of the ridge P during the planting work.

Furthermore, according to the first embodiment, when a strong impact is applied to each roller member 6a due to contact with a stone or the like located on the slope of the ridge P, the roller arm 6b is allowed to escape to the upper penetration portion 6c2a. Therefore, damage to the guide roller 6 can be prevented.

In addition, according to the first embodiment, when the vehicle height of the traveling vehicle body 10 is lowered after the aircraft turns, the suppression frame 28 is rotated forward and downward as the lift arm 30 is moved forward. When the robot moves, each roller arm 6b moves downward along the guide hole 6c2 under its own weight, so that the roller member 6a moves downward and inward in the width direction of the machine body. Therefore, when the vehicle height of the traveling vehicle body 10 is lowered, the pair of roller members 6a can be naturally fitted to the slope of the ridge P.

Further, according to the first embodiment, the pair of left and right guide rollers 6 are respectively attached to the support rod 27 so that the left and right positions can be adjusted. It can be adjusted, and it is possible to prevent the planting position by the planting device 3 from being disturbed from side to side.
On the other hand, FIG. 7 is a schematic left side view of the left crawler 45 provided in the transplanter 1 according to the second embodiment of the present invention.

The transplanter 1 according to this embodiment includes a pair of left and right crawlers 45 instead of a pair of left and right chain cases 14 and a pair of left and right rear wheels 9, and is similar to the above embodiment except for the following points. It has the same configuration as the transplanter 1.

Each crawler 45 includes a drive wheel 46 that receives power from the axle 13 shown in FIGS. 1 and 7, a crawler belt 48 that is rotated by the drive wheel 46, a driven wheel 47 that applies tension to the crawler belt 48, and a crawler belt 47 that applies tension to the crawler belt 48. A swinging frame 49 disposed at the rear lower part of the swinging frame 45, a front rolling wheel 50 mounted on the front part of the swinging frame 49, a rear rolling wheel 51 mounted on the rear part of the swinging frame 49, and a swinging frame 45. 49, a basic frame 52 that supports the driving wheels 46 and the driven wheels 47.

As the piston rod of the lifting hydraulic cylinder 70 shown in FIG. 2 protrudes rearward, the pair of lifting arms 20 shown in FIGS. 1, 2, 4, etc. rotate clockwise when viewed from the left side. Then, the left and right crawlers 45 are rotated downward around the axle 13 (specifically, clockwise when viewed from the left side). As a result, the vehicle height of the vehicle body 10 increases. On the other hand, when the piston rod of the lifting hydraulic cylinder 70 is accommodated forward, the pair of lifting arms 20 are rotated forward (specifically, counterclockwise when viewed from the left side). As a result, the left and right crawlers 45 are rotated upward around the axle 13 (specifically, counterclockwise when viewed from the left side), and the vehicle height of the vehicle body 10 is lowered. In this way, since the pair of lifting arms 20 are rotated when the vehicle height is raised and lowered, the pressure roller 5 and the roller member 6a are raised and lowered in conjunction with the raising and lowering of the vehicle height, similarly to the first embodiment. be able to.

The left crawler 45 will be described in detail below, but the left and right crawlers 45 have the same configuration, and the same can be said of the right crawler 45.
FIG. 8 is a schematic perspective view of the vicinity of the swing frame 49 of the left crawler 45.

The swing frame 49 is attached to the basic frame 52 so as to be able to swing around a swing center 62, and when the swing frame 49 swings while driving or raising and lowering the vehicle height. , the front wheel 50 and the rear wheel 51 are rotated around the swing center 62.

The rear rollers 51 include an outer roller 51a disposed outside the swing frame 49 in the width direction of the fuselage, and an inner roller 51b disposed inside the swing frame 49 in the width direction of the fuselage. A shaft body 56 (see FIGS. 10, 11, 13, etc.) is rotatably attached to the swing frame 49. That is, the outer roller 51a and the inner roller 51b are connected to the swing frame 49 via the shaft 56. The shaft body 56 extends in the width direction of the machine body, and is connected to the outer wheel 51a via a bush 64 shown in FIG. 11.

The rear wheel 51 is connected (arranged) to the rear part of the swinging frame 49 arranged at the rear lower part of the crawler 45, and has the role of directing the crawler belt 48, which is in contact with the field and extends in the front-rear direction, forward and upward. Fulfill. Therefore, a load is easily applied to the rear wheel 51 during running, and in addition, if stones, mud, etc. enter between the swing frame 49 and the rear wheel 51, a further load is applied to the rear wheel 51. It's easy to get affected. In this embodiment, various measures are taken to release intruding stones, mud, etc., as will be described in detail below.

9 is an enlarged left side view of the vicinity of the outer roller 51a of the rear roller 51 of the left crawler 45, and FIG. 10 is an enlarged left side view of the outer roller 51a along the line XX shown in FIG. 11 is a partial vertical cross-sectional view of the vicinity of the hub 53, and FIG. 11 is a horizontal cross-sectional view of the vicinity of the outer wheel 51a taken along the YY line shown in FIG. Note that in FIG. 11, the crawler belt 48 is omitted for convenience.

The outer wheel 51a of the left crawler 45 includes a hub 53 located at the center in the radial direction, a rim 54 located at the outer periphery, and three spokes 55 extending radially from the hub 53 to the rim 54. There is.

The three spokes 55 are arranged at 120° intervals in the circumferential direction of the hub 53, as shown in FIG. Therefore, the three mud escape spaces 63 formed between the spokes 55 can be made wider, and the mud that has entered the gap between the swing frame 49 and the rear wheel 51 can be removed from the mud escape spaces 63. It can escape to the outside of the rear wheel 51 in the width direction of the machine body.

Here, as shown in FIG. 11, the three spokes 55 are located outside the inner end of the hub 53 in the machine width direction, and are located inside the rim 54 in the machine width direction. It is located outside the edge of the Therefore, mud or the like that has entered between the swing frame 49 and the rear wheel 51 is less likely to be prevented from escaping to the outside through the mud escape space 63. Further, by arranging each spoke 55 in such a position, mud is prevented from flowing from each of the three mud escape spaces 63 to the adjacent mud escape spaces 63 while the outer rolling wheel 51a rotates freely during running. It can be partitioned off with spokes 55 to prevent it from moving.

Furthermore, as shown in FIG. 10, the hub 53 and the three spokes 55 each have a vertical dimension of an inner end (=inner end) in the width direction of the fuselage, and an outer end (=outer end). It is formed with dimensions larger than the vertical dimensions of. That is, the hub 53 and the three spokes 55 each have a substantially trapezoidal shape or a substantially triangular shape when viewed in longitudinal section. Therefore, mud, etc. on the hub 53 and each spoke 55 due to vibrations during traveling can be dropped to the outside of the aircraft body due to vibrations during traveling, etc., and can be dropped between the swing frame 49 and the outer wheel 51a. It can prevent you from putting it away.

As shown in FIGS. 10 and 11, a portion of the outer wheel 51a located on the radially outer side of the hub 53 (in other words, a peripheral portion of the hub 53) has a shape that protrudes inward in the width direction of the machine body. As a result, a space 58 is formed inside the protrusion 57 in the radial direction. Note that the radially inner side of the protrusion 57 is around the shaft body 56. In addition, as shown in FIGS. 7 and 9, the lower end of the swing frame 49 is set to be located above the lower end of the hub 53, and has a protrusion extending inward in the width direction of the body. It is set to be located above the lower end of the inner surface of the portion 57 (in the radial direction of the hub 53).

In this way, by making the radially outer portion of the hub 53 protrude toward the swing frame 49, mud, stones, etc. are prevented from entering the portion between the swing frame 49 and the hub 53. At the same time, mud and the like that have entered the space 58 can be discharged from the lower part of the space 58 to the inside in the width direction of the machine body. Note that the inner surface of the protrusion 57, that is, the surface facing the space 58, may be configured to extend more smoothly and obliquely toward the shaft body 56 than shown in FIG. Mud and the like that have entered the space 58 can be smoothly discharged.

In addition, as shown in FIG. 11, the rim 54 has a tapered shape (=a mortar shape) so that it moves away from the hub 53 (in other words, from the radial center of the outer wheel 51a) as it goes outward in the width direction of the machine body. (shaped). Therefore, even if mud or the like adheres to the radially inner portion of the rim 54 (the portion facing the mud escape space 63) while traveling, it will not slide off to the outside in the width direction of the aircraft due to vibrations during traveling. can.

On the other hand, FIG. 12 is a partial cross-sectional rear view of the vicinity of the inner roller 51b of the rear roller 51 of the left crawler 45, and FIG. 13 is a rear view of the spring 59 provided on the inner roller 51b shown in FIG. FIG. 2 is a schematic perspective view showing an exposed state.

The inner roller 51b includes a hub 67 located at the center in the radial direction, a rim 68 located at the outer circumference, and spokes 69 that connect the hub 67 and the rim 68. 56. That is, the inner roller 51b is configured to be slidable along the shaft body 56.

The hub 67 of the inner roller 51b, like the hub 53 of the outer roller 51a, has a radially outer portion (=periphery) protruding inward in the machine body width direction, so that A housing space 65 is formed inside the protrusion 66 . The protrusion 66 has a cylindrical shape, and the housing space 65 accommodates a spring 59 shown in FIG. 13 . The spring 59 is pressed down by a pressing member 60 so as not to protrude inward from the housing space 65 in the width direction of the machine body.Furthermore, with the edge of this pressing member 60 in contact with the protrusion 66, the locking member It is locked by 61. Therefore, the hub 67 and the entire inner roller 51b are biased by the spring 59 toward the outside in the machine body width direction, that is, toward the swing frame 49 side.

With this configuration, mud, stones, etc. can enter between the inner roller wheel 51b and the swing frame 49, and the force (=load) that presses the inner roller wheel 51b inward in the width direction of the machine body becomes excessively strong. When the spring 59 is compressed and the inner roller 51b is naturally slid inward in the width direction of the machine body along the shaft 56, the inner roller 51b can be protected and the distance between the inner roller 51b and the swing frame 49 can be reduced. It is possible to spread out mud and other intruding substances downward. In addition, after the intruder is discharged, the inner roller 51b can be returned to the outside in the width direction of the machine body by the biasing force of the spring 59, so that the intrusion of mud and the like can be suppressed.
<Technical significance of the second embodiment>
According to the second embodiment shown in FIGS. 7 to 13, the following effects can be obtained in addition to the effects obtained by the embodiments described above.
That is, according to the second embodiment, since the three spokes 55 of the outer wheel 51a of the rear wheel 51 are arranged at equal intervals (120° intervals), there is a mud escape space 63 between the spokes 55. This allows mud and the like that have entered between the outer rolling wheels 51a and the swing frame 49 to escape from the mud escape space 63 to the outside of the body. In addition, as shown in FIG. 11, the three spokes 55 are located on the outside of the inner end of the rim 54 and the inner end of the hub 53 in the width direction of the aircraft body, so that the three spokes 55 are free from mud. It is difficult to prevent objects such as objects from escaping to the outside of the aircraft.

Further, according to the second embodiment, the rim 54 located at the outer circumference of the outer roller 51a of the rear roller 51 is formed in a tapered shape so as to move away from the hub 53 toward the outside in the width direction of the aircraft body. Therefore, even if mud or the like adheres to the inner part of the rim 54 in the radial direction, the mud or the like will slide along the outer surface of the tapered rim 54 in the width direction of the fuselage. It is possible to effectively prevent mud from accumulating between the ring 51a and the ring 51a. Therefore, it is possible to prevent damage to the rear wheel 51, which is located at the rear lower part of each crawler 45 and is easily subjected to load during running.

In addition, according to the second embodiment, each of the hub 53 and three spokes 55 of the outer roller 51a of the rear roller 51 has a vertical dimension of the inner end in the width direction of the aircraft body that is equal to the upper and lower dimensions of the outer end. Because it is formed with a larger dimension (for example, triangular or trapezoidal in longitudinal section), dirt and the like on the hub 53 and spokes 55 can be dropped to the outside of the aircraft due to vibrations during running. , it is possible to prevent mud, etc. from falling between the rear wheel and the swing frame.

Further, according to the second embodiment, the inner roller 51b of the rear roller 51 is configured to be slidable in the width direction of the aircraft body along the shaft body 56, and the inner roller 51b of the rear roller 51 is configured to be slidable in the width direction of the aircraft body. Since a spring 59 is provided that biases the wheel 51b outward in the width direction of the machine body, mud, stones, etc. can enter between the inner wheel 51b and the swing frame 49, and cause damage to the inner wheel 51b. When an excessive load is applied, the inner roller 51b can be slid inward in the width direction of the machine body against the biasing force of the spring 59, and the load on the inner roller 51b can be reduced. Furthermore, at this time, since the gap between the inner roller 51b and the swing frame 49 can be widened, intruding substances such as mud can be discharged downward.
In addition, after the intruder is discharged, the inner roller 51b can be returned to the outside in the width direction of the machine body by the biasing force of the spring 59, so that subsequent intrusion of mud and the like can be suppressed.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention described in the claims, and these are also included within the scope of the present invention. Needless to say.

For example, in each of the embodiments shown in FIGS. 1 to 13, the left base 28b of the suppression frame 28 is mounted near the left end of the support rod 27 together with the lift arm 30 extending from the left lifting arm 20. However, instead of or in conjunction with this configuration, a separate lift arm is extended forward from the right lifting arm 20, and the lift arm is connected to the right base 28b of the suppression frame 28. Additionally, it may be configured to be connected to a rotating cam separately provided near the right end of the support rod 27.

Furthermore, in each of the embodiments shown in FIGS. 1 to 13, the base 28b of the suppression frame 28 and the front end of the lift arm 30 are connected to the rotating cam 29 by a single pin 31. It is not necessarily necessary to connect the base 28b of the suppression frame 28 to the rotation cam 29 together with the front end of the lift arm 30, and the base 28b of the suppression frame 28 and the front end of the lift arm 30 may be rotated separately. It may also be connected to the cam 29.

1 Transplanter 3 Planting device 4 Conveying device 5 Pressing roller 6 Guide roller 7 Seedling holder 8 Front wheel 9 Rear wheel 10 Traveling body 11 Engine 12 Mission case 13 Axle 14 Chain case 15 Horizontal control hydraulic cylinder 16 Control handle 17 Body frame 18 Bumper 19 Planting lift lever 20 Lifting arm 21 Suppression ring 23 Take-up rod 24 Connection rod 25 First transmission 26 Second transmission 27 Support rod 28 Suppression frame 29 Rotating cam 30 Lift arm 31 Connection pin 32 First plate 33 Second plate 34 Knob bolt 35 Tube 36 Center of rotation 37 Cable 38 Water absorption hose 39 Filter 40 Hose band 41 Cap 42 Spring 43 Weight 45 Crawler 46 Drive wheel 47 Followed wheel 48 Crawler belt 49 Swing frame 50 Front roller 51 Rear roller 52 Basic frame 53 Hub (outer wheel 54 rim 55 spoke 56 rear wheel shaft 57 protrusion (outer wheel)
58 Space 59 Spring 60 Holding member 61 Locking member 62 Swing center 63 Mud escape space 64 Bush 65 Accommodation space 66 Projection part (inner roller)
67 Hub (inner wheel)
68 Rim (inner wheel)
69 Spoke (inner wheel)
70 Hydraulic cylinder for lifting

Claims (5)

A transplanter for planting transplants in a field,
A running vehicle body configured to be able to raise and lower the vehicle height;
a planting device for transplanting transplants into a field;
a support rod attached to the bumper of the traveling vehicle body and extending in the left-right direction;
a suppressing frame having a substantially U-shape with the open portion facing rearward in plan view, and having left and right rear end portions rotatably mounted near the left and right end portions of the support rod;
a pressing roller rotatably attached to the left and right center portions of the pressing frame, and smoothing unevenness of the ridge surface;
a rotary cam mounted near the left and/or right end of the support rod so as to be rotatable about the support rod;
and a lift arm that is moved back and forth in conjunction with the elevation and descent of the vehicle height of the traveling vehicle body,
The rotating cam is configured such that the front end of the lift arm is connected to both left and right sides of the suppression frame and/or to one side of the left and right side, and rotates the lift in conjunction with an increase in the vehicle height of the traveling vehicle body. When the arm is moved rearward, it is configured to rotate clockwise around the support rod when viewed from the left side, and as a result, the suppression frame connected to the rotation cam rotates around the support rod. A transplanting machine characterized in that the pressure roller rises by rotating clockwise when viewed from the left side. comprising a pair of left and right guide rollers that guide the traveling vehicle body to travel along the ridges of the field by contacting the slopes on the left and right sides of the ridges;
The pair of left and right guide rollers each include a frame-shaped guide holder that is fixed to the support rod so that its left and right positions can be adjusted, and a roller arm that is connected to the guide holder so that it can rotate up and down and slide left and right. and a roller member fixed to the front part of the roller arm and in contact with either the left or right slope of the ridge,
A guide hole is formed on the front surface of each guide holder to limit the rotation angle and horizontal position of the roller arm. located above the guide holder and extending from the inside of the guide holder to the front of the guide holder through the guide hole,
The guide hole includes an upper penetrating portion extending diagonally inward and downward in the width direction of the fuselage, and a lower penetrating portion extending diagonally outward and downward in the width direction of the fuselage from the lower end of the upper penetrating portion. 2. The transplanter according to claim 1, wherein the guide hole as a whole has a substantially doglegged shape when viewed from the front. The traveling vehicle body includes a pair of left and right crawlers,
The crawler is provided with a swing frame that is swingably disposed at the rear lower part of the crawler on each of the left and right sides, and a front wheel is arranged at the front part of the swing frame, and a rear road wheel is arranged at the rear part of the swing frame. Ori,
The rear wheel includes an inner wheel located inside the swing frame in the width direction of the aircraft body, and an outer wheel located outside the swing frame,
The outer rolling wheel includes a hub located at the center in the radial direction, a rim located at the outer periphery, and three spokes extending from the hub to the rim,
The rim is formed in a tapered shape so as to move away from the hub toward the outside in the width direction of the aircraft body,
The three spokes are arranged at 120° intervals in the circumferential direction of the hub, and are located outside the inner end of the rim and the inner end of the hub in the width direction of the aircraft body. The transplanting machine according to claim 1 or 2, characterized in that: 4. The hub and the three spokes are each formed such that the vertical dimension of the inner end thereof in the width direction of the aircraft body is larger than the vertical dimension of the outer end thereof. The transplanter described. The rear rolling wheel includes a shaft body extending in the width direction of the aircraft body and connecting the outer rolling wheel and the inner rolling wheel,
The inner roller is configured to be slidable along the shaft, and includes a hub located at the center of the inner roller in the radial direction,
The radially outer portion of the hub has a shape that protrudes inward in the width direction of the fuselage, thereby forming an accommodation space on the radially inner side,
4. The transplanting machine according to claim 3, wherein the accommodation space accommodates a spring that urges the inner roller outward in the width direction of the machine body.