transplant machine

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

Technical Field

[0001] The present invention relates to a transplanter for planting transplants such as vegetable seedlings, tuber seeds of taro, and bulbs such as rakkyo in a field.

Background Art

[0002] Conventionally, a leveling roller that rolls on the ridge surface (the upper surface of the ridge) to level the unevenness of the ridge surface is disposed at the front portion of a transplanter for transplanting transplants such as seedlings, tuber seeds, and bulbs in a field. By leveling the unevenness of the ridge surface using the leveling roller, the planting depth of the transplants can be stabilized. Generally, when the transplanter turns to move to an adjacent ridge, in order to prevent contact with the ridge, an operator raises the vehicle height by lowering the position of the rear wheels, and then presses down the steering handle disposed at the rear end of the machine body to lift the front portion of the machine body. However, when a leveling roller is disposed at the front portion of the machine body, it is necessary to largely press down the steering handle so that the leveling roller does not contact the ridge, which has been a burden on the operator.

[0003] On the other hand, in the transplanter described in Patent Document 1, the front wheels disposed at the front portion of the machine body are moved up and down by a lifting mechanism including an actuator such as a motor. Then, an arm that supports the leveling roller is wound up by a wire in conjunction with the lifting of the front wheels, so that the leveling roller is configured to rotate up and down. With this configuration, when the machine body turns, as the front wheels are lifted by driving the actuator, the leveling roller is automatically rotated upward, so that the burden on the operator of pressing down the steering handle can be reduced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the configuration described in Patent Document 1 requires a lifting mechanism to raise and lower the front wheels in addition to the conventional rear wheel lifting mechanism, which complicates the aircraft's structure and increases the weight of the front of the aircraft.

[0006] In light of these circumstances, the present invention aims to provide a transplanting machine that, even with a simple configuration, can raise a compaction roller that smooths out unevenness on the ridge surface when turning. [Means for solving the problem]

[0007] The objective of the present invention is to A transplanting machine for planting transplanted crops in a field. A vehicle body configured to allow the vehicle height to be raised and lowered, A planting device for transplanting plants into the field, A support rod is attached to the bumper of the aforementioned vehicle body and extends in the left-right direction, In a plan view, the compression frame has a roughly U-shape with the open portion facing rearward, and its left and right rear ends are rotatably attached near the left and right ends of the support rod, A compaction roller is rotatably mounted in the left and right center of the aforementioned compaction frame to level the unevenness of the ridge surface, A rotating cam is mounted near the left and / or right end of the support rod so as to be rotatable around the support rod, It includes a lift arm that moves forward and backward in conjunction with the raising and lowering of the vehicle height of the aforementioned vehicle body, The rotating cam is connected to the front end of the lift arm and both left and right sides and / or one of the left and right sides of the compaction frame, and is configured to rotate clockwise around the support rod in a left side view when the lift arm moves rearward in conjunction with the rise in the height of the traveling vehicle body, thereby causing the compaction roller to rise as the compaction frame connected to the rotating cam rotates clockwise around the support rod in a left side view.

[0008] According to the present invention, as the vehicle height of the traveling vehicle is raised, the lift arm moves backward, causing the rotating cam connected to the front of the lift arm to rotate, which in turn causes the compaction frame, also connected to the rotating cam, to rotate upward around the support rod. Therefore, in addition to the mechanism for adjusting the vehicle height of the traveling vehicle, the compaction roller can be raised in conjunction with the increase in vehicle height without the need for a separate actuator such as a motor. Thus, even with a simple configuration, the compaction roller can be raised during turning.

[0009] Furthermore, according to the present invention, since the compaction frame equipped with the compaction roller is rotatably mounted on the support rod, the compaction frame naturally rotates downwards due to the weight of the compaction roller and the compaction frame itself. Therefore, even if the compaction frame is temporarily rotated upwards due to protrusions or stones on the ridge surface, the posture of the compaction frame can be naturally returned to a downward-sloping position, thereby stabilizing the planting depth.

[0010] In a preferred embodiment of the present invention, The vehicle is equipped with a pair of left and right guide rollers that contact the slopes on the left and right sides of the ridge, thereby guiding the vehicle to travel along the ridge in the field. Each of the left and right guide rollers comprises a frame-shaped guide holder fixed to the support rod so as to be able to adjust its left-right position, a roller arm connected to the guide holder so as to be able to rotate vertically and slide horizontally, and a roller member fixed to the front of the roller arm and in contact with either the left or right slope of the ridge. Guide holes are formed on the front surface of each guide holder to limit the rotation angle and lateral position of the roller arm, and each roller arm is positioned above the portion of the compaction frame that extends in the lateral direction, which is roughly U-shaped, and extends from inside the guide holder through the guide holes to the front of the guide holder. The guide hole comprises an upper through-hole that extends diagonally inward and downward in the width direction of the aircraft, and a lower through-hole that extends diagonally outward and downward from the lower end of the upper through-hole, and the guide hole as a whole has a roughly V-shape when viewed from the front.

[0011] According to this preferred embodiment of the present invention, the roller arms supporting the roller members that contact the slope of the ridges are connected to the guide holder so as to be rotatable vertically and are located above the compaction frame on which the compaction rollers are mounted. Therefore, when the compaction rollers rotate upward in conjunction with the increase in vehicle height, the left and right roller arms are pressed by the compaction frame and rotated upward, causing the left and right roller members to rise. Consequently, it is possible to prevent the pair of guide rollers from contacting the ridges and collapsing them when the machine turns.

[0012] Furthermore, according to this preferred embodiment of the present invention, the lower penetration portion of the guide hole of the guide holder, which 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. In other words, the lower penetration portion extends in a direction substantially perpendicular to the force applied from the slope of the ridge. Therefore, when the roller arm, which is rotated downward by its own weight and the weight of the roller member and is in a position to pass the lower penetration portion, is subjected to a force pushing back from the slope of the ridge, the roller arm is held in place by the lower end of the corner formed between the upper and lower penetration portions. Thus, it is possible to prevent the roller member from frequently separating from the slope of the ridge during transplanting work.

[0013] In addition, if a strong impact is applied to each roller component due to contact with stones or other objects located on the slope of the ridge, the roller arm can be retracted to the upper penetration section, thus preventing damage to the guide roller.

[0014] Furthermore, according to this preferred embodiment of the present invention, when the vehicle height of the traveling vehicle is lowered after the machine has turned, the compaction frame rotates downwards and downwards as the lift arm moves forward, causing each roller member and roller arm to move downwards and inwards in the width direction of the machine along the guide hole due to their own weight. Therefore, when the vehicle height of the traveling vehicle is lowered, the pair of roller members can be naturally fitted to the slope of the ridge.

[0015] Furthermore, according to this preferred embodiment of the present invention, since the left and right pair of guide rollers are configured to be adjustable in their left and right positions, the left and right distance between the pair of guide rollers can be adjusted to match the width of the furrow, thereby preventing the planting position by the planting device from being disturbed from side to side.

[0016] In a more preferred embodiment of the present invention, The aforementioned vehicle body is equipped with a pair of left and right crawlers, The aforementioned crawler is equipped with a swingable frame on the lower rear of each left and right crawler, with a front wheel positioned at the front of the swingable frame and a rear wheel positioned at the rear of the swingable frame. The aforementioned rear road wheel comprises an inner road wheel located inside the oscillating frame in the width direction of the aircraft body, and an outer road wheel located outside the frame. The outer wheel comprises a hub located at its radial center, a rim located at its outer circumference, and three spokes extending from the hub to the rim. The rim is tapered so that it moves away from the hub as it moves outward in the width direction of the aircraft. 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.

[0017] According to this preferred embodiment of the present invention, since the three spokes of the outer idler wheel are arranged at equal intervals (120° intervals), a wide space can be taken between the spokes, and mud or the like that has entered between the outer idler wheel and the swing frame can escape from between the spokes to the outside of the machine body. In addition, since the three spokes are located outside in the width direction of the machine body rather than the inner end portion of the rim and the inner end portion of the hub, it is difficult to prevent mud or the like from escaping to the outside of the machine body.

[0018] Furthermore, since the rim located on the outer peripheral portion of the outer idler wheel is formed in a tapered shape so as to be farther from the hub toward the outside in the width direction of the machine body, even when mud or the like adheres to the inner portion in the radial direction of the rim, the mud or the like slides down along the outer surface in the width direction of the machine body of the tapered rim, so that it is possible to effectively prevent a situation where mud or the like accumulates between the swing frame and the outer idler wheel. Therefore, it is possible to prevent breakage of the rear idler wheel located at the lower rear part of each crawler and likely to be loaded during traveling.

[0019] In a further preferred embodiment of the present invention, The hub and the three spokes are each formed with dimensions such that the vertical dimension of the inner end portion in the width direction of the machine body is larger than the vertical dimension of the outer end portion.

[0020] According to this preferred embodiment of the present invention, the hub and the three spokes of the outer idler wheel are each formed with dimensions such that the vertical dimension of the inner end portion in the width direction of the machine body is larger than the vertical dimension of the outer end portion (for example, triangular shape, trapezoidal shape, etc. in a longitudinal sectional view). Therefore, mud or the like on the hub or spokes can be dropped to the outside of the machine body by vibrations during traveling, etc., and a situation where mud or the like falls between the rear idler wheel and the swing frame can be suppressed.

[0021] In a further preferred embodiment of the present invention, The rear idler wheel extends in the width direction of the machine body and includes a shaft body that connects the outer idler wheel and the inner idler wheel. The inner wheel is configured to slide along the shaft and is equipped with a hub located at the radial center of the inner wheel. The portion of the hub located radially outward has a shape that protrudes inward in the width direction of the aircraft, thereby forming a housing space radially inward. A spring that biases the inner road wheel outward in the width direction of the aircraft is housed in the aforementioned housing space.

[0022] According to this preferred embodiment of the present invention, the inner wheel is configured to slide along the shaft, and a spring is provided on the hub of the inner wheel that biases the inner wheel outward in the width direction of the machine body. Therefore, when mud, stones, or the like enter between the inner wheel and the oscillating frame and an excessive load is placed on the inner wheel, the inner wheel can be slid inward in the width direction of the machine body against the biasing force of the spring to relieve the load, thereby reducing the load on the inner wheel. Furthermore, at this time, the gap between the inner wheel and the oscillating frame can be widened, allowing the intruded material such as mud to be discharged downward.

[0023] In addition, after the intruded material is expelled, the biasing force of the spring 59 allows the inner road wheel to be returned to the outside in the width direction of the machine, thereby suppressing the subsequent intrusion of mud and other debris. [Effects of the Invention]

[0024] According to the present invention, it is possible to provide a transplanting machine that, even with a simple configuration, can raise the position of the compaction roller that smooths out the unevenness of the ridge surface when turning. [Brief explanation of the drawing]

[0025] [Figure 1] Figure 1 is a schematic left side view of a transplanting machine according to the first embodiment of the present invention. [Figure 2] Figure 2 is a schematic plan view of the transplanting machine shown in Figure 1. [Figure 3] Figure 3 is an enlarged plan view of the vicinity of the bumper located at the front of the vehicle body. [Figure 4] Figure 4 is an enlarged left side view of the area near the bumper located at the front of the vehicle body. [Figure 5] Figure 5 is a diagram showing the tip of the water intake hose. [Figure 6] Figure 6 is a roughly left side view of the vicinity of the base portion of the main clutch lever shown in Figure 1. [Figure 7] Figure 7 is a substantially left side view of the left crawler provided in the transplanting machine according to the second embodiment of the present invention. [Figure 8] Figure 8 is a schematic perspective view of the vicinity of the oscillating frame of the left crawler. [Figure 9] Figure 9 is an enlarged left side view of the vicinity of the outer wheel of the rear wheel of the left crawler. [Figure 10] Figure 10 is a partial longitudinal cross-sectional view of the vicinity of the hub of the outer road wheel along line XX shown in Figure 9. [Figure 11] Figure 11 is a horizontal cross-sectional view of the vicinity of the outer road wheel along the YY line shown in Figure 9. [Figure 12] Figure 12 is a roughly rear view of the area near the inner wheel of the rear wheel of the left crawler. [Figure 13] Figure 13 is a schematic perspective view showing the exposed spring on the inner road wheel shown in Figure 12. [Modes for carrying out the invention]

[0026] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Figure 1 is a schematic left side view of the transplanting machine 1 according to the first embodiment of the present invention, and Figure 2 is a schematic top view of the transplanting machine 1 shown in Figure 1.

[0027] In this specification, unless otherwise specified, the side of the transplanter 1 that is in the direction of travel will be referred to as "front," and the opposite side as "rear." The left side facing forward, which is the direction of travel of the transplanter 1, will be referred to as "left," and the opposite side as "right." The transplanter 1 according to this embodiment is configured to transplant sweet potato seedlings into a field, but the type of plant to be transplanted into the field is not limited to sweet potatoes.

[0028] The transplanting machine 1 comprises a vehicle body 10 (hereinafter also simply referred to as "vehicle body") that moves the machine forward, a transport device 4 attached to the vehicle body 10 that transports seedlings set in seedling holders 7 by the operator to the lower part of the machine body, a planting device 3 that transplants seedlings transported by the transport device 4 into the field by repeatedly performing planting operations, a compaction roller 5 and a pair of left and right guide rollers 6 positioned in front of the vehicle body 10, a pair of left and right compaction wheels 21 provided at the rear of the vehicle body, and a steering handle 16 attached to the machine frame 17 provided at the rear of the vehicle body 10. In this specification, "machine body" refers to the transplanting machine.

[0029] The vehicle body 10 is equipped with an engine 11 as the power source for the machine, a transmission 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 drive wheels, and a pair of left and right front wheels 8 as idle wheels.

[0030] The power shifted by the transmission case 12 is transmitted to the conveying device 4 and the planting device 3 via the first transmission device 25 and the second transmission device 26, as well as to the pair of rear wheels 9 via the axle 13 mounted on the transmission case 12 and the pair of left and right chain cases 14. As a result, the pair of rear wheels 9 rotate and the vehicle body 10 moves forward, and at the same time the conveying device 4 rotates intermittently, the seedlings that have been transported to a position that overlaps with the trajectory of the planting device 3 during its planting operation are picked up by the planting device 3, which repeats its planting operation, and transplanted into the ridges P in the field. Each of the pair of compaction wheels 21 rotates freely on the ridge surface as the vehicle body 10 moves, thereby compacting the topsoil after transplanting.

[0031] The control handle 16 is equipped with a main clutch lever 18 used to disengage the main clutch that connects and disconnects the transmission of power to the vehicle body 10, the transport device 4, and the planting device 3, as well as a planting lift lever 19 used to adjust the vehicle height of the vehicle body 10.

[0032] Each of the pair of chain cases 14 has an upward-extending lifting arm 20 integrally attached to its mounting portion to the transmission case 12. The left lifting arm 20 is connected by a horizontal control hydraulic cylinder 15 to the left end of a balance rod 23, which is rotatably mounted around its vertical axis to the tip of the piston rod of a lifting hydraulic cylinder 70 (see Figure 2) fixed to the transmission case 12. 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.

[0033] When the planting lifting lever 19 is operated, the piston rod of the lifting hydraulic cylinder 70 extends backward, causing the pair of lifting arms 20 to rotate backward (specifically, clockwise in a left-side view). This causes the pair of chain cases 14 to rotate downward around the axle 13 (specifically, clockwise in a left-side view), and the pair of rear wheels 9 to descend. As a result, the height of the vehicle body 10 increases.

[0034] In response, when the piston rod of the hydraulic cylinder 70 for lifting is retracted forward by operating the planting lifting lever 19, the pair of lifting arms 20 are rotated forward (specifically, counterclockwise in a left side view). This causes the pair of chain cases 14 to rotate upward around the axle 13 (specifically, counterclockwise in a left side view), and the pair of rear wheels 9 are raised. As a result, the height of the vehicle body 10 is lowered. The left lifting arm 20 is connected to the rear end of the lift arm 30, which will be described in detail later.

[0035] Figure 3 is an enlarged plan view of the vicinity of the bumper 2 located at the front of the vehicle body 10, and Figure 4 is an enlarged left side view of the vicinity of the bumper 2 located at the front of the vehicle body 10. More specifically, Figure 4(a) is an enlarged left side view of the vicinity of the bumper 2 during planting work, and Figure 4(b) is an enlarged left side view of the vicinity of the bumper 2 when the vehicle height of the vehicle body 10 is adjusted to a higher position during turning. The dashed lines in Figure 3 show a schematic front view of the guide holder 6c, which will be described in detail later.

[0036] A support rod 27 is attached to the bumper 2 of the vehicle body 10, extending in the width direction (left-right direction) of the machine. The support rod 27 is a member whose central part in the width direction is hexagonal in a vertical cross-sectional view, and whose left and right ends are circular in a vertical cross-sectional view. The left and right rear ends 28b1 of a compaction frame 28, which is roughly U-shaped in a plan view, are rotatably attached to these left and right ends of the support rod 27, and the compaction frame 28 is supported by the support rod 27.

[0037] The compaction frame 28 comprises a support portion 28a extending in the width direction (left-right direction) of the machine body, and a pair of left and right base portions 28b extending from both left and right ends of the support portion 28a to a rear support rod 27, with the open portion facing rearward in a plan view. The open portion refers to the gap in the left-right direction between the rear ends of the pair of base portions 28b. A compaction roller 5, which smooths out the unevenness of the ridge surface (upper surface of the ridge P) by rolling on the ridge surface, is rotatably mounted in the left and right center of the support portion 28a, and the support portion 28a rotatably supports the compaction roller 5.

[0038] In addition to the compaction frame 28, the support rod 27 is equipped with a pair of left and right guide rollers 6 that contact the left and right slopes of the ridge to guide the vehicle body 10 to travel along the ridge P, and a rotating cam 29 that rotates the compaction 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 vertical cross-section.

[0039] Here, the rotating cam 29, the left base 28b of the compaction frame 28, and the front end of the lift arm 30 are connected by connecting pins 31 that extend to the left and right. When the vehicle height of the vehicle body 10 is raised (above a certain level), and the pair of lifting arms 20 are rotated clockwise in a left side view, as shown in Figure 4(b), the lift arm 30 is pulled backward by the lifting arms 20. As a result, the rotating cam 29 is rotated clockwise in a left side view around the support rod 27, and the position of the connecting pins 31 is moved higher than before the vehicle height of the vehicle body 10 was raised. This causes the compaction frame 28 to rotate upward around the support rod 27, and the compaction roller 5 rises.

[0040] In this way, when the height of the vehicle body 10 is raised, the compaction roller 5 rises in conjunction, preventing the compaction roller 5 from contacting the ridge P and causing the ridge P to collapse when the machine turns. In addition, because the compaction roller 5 is raised, it does not get in the way when turning to the adjacent ridge P.

[0041] On the other hand, each of the left and right guide rollers 6 comprises a frame-shaped guide holder 6c fixed to a support rod 27, a roller arm 6b connected to the guide holder 6c, and a roller member 6a fixed to the front of the roller arm 6b. When the vehicle body 10 is traveling with the transplanting of seedlings by the planting device 3, the roller member 6a of the left guide roller 6 contacts the slope on the left side of the ridge P, and the roller member 6a of the right guide roller 6 contacts the slope on the right side of the ridge P, thereby guiding the vehicle body 10 to travel along the ridge P.

[0042] A hole (not shown) for fixing to the support rod 27 is formed at the rear of each guide holder 6c. By aligning this hole with one of the multiple through holes (not shown) formed in the support rod 27 in the left-right direction, a wing bolt or push bolt can be inserted to fix the left-right position of each guide roller 6. In other words, each guide holder 6c is fixed to the support rod 27 so that its left-right position can be adjusted. Note that it is not necessarily required to provide multiple through holes in the support rod 27. Alternatively, a hook for attaching to the support rod 27 can be provided on the lower surface of each guide holder 6c, and a wing bolt or push bolt can be pressed against the support rod 27 through the fixing hole formed at the rear of each guide holder 6c, thereby allowing the left-right position of each guide roller 6 to be changed steplessly.

[0043] Each frame-shaped guide holder 6c is hollow inside, through which a shaft 6c1 extending in the left-right direction passes. The roller arm 6b of each guide roller 6 is connected to the shaft 6c1 so as to be able to rotate vertically and slide horizontally. There is a slight amount of play in this connection, which allows the roller arm 6b to be moved slightly diagonally relative to the shaft 6c1.

[0044] A guide hole 6c2 is formed on the front surface of each guide holder 6c, connecting the outside of the guide holder 6c with the hollow portion inside. The roller arm 6b extends from inside the guide holder 6c through the guide hole 6c2 towards the front of the guide holder 6c. Therefore, the roller arm 6b can only rotate vertically and slide horizontally in the direction in which the guide hole 6c2 extends. The guide hole 6c2 serves to limit the vertical rotation angle and horizontal position of the roller arm 6b. In other words, the guide hole 6c2 has the function of defining the vertical rotation angle and horizontal position of the roller arm 6b.

[0045] As shown in the dashed lines within the speech bubble in Figure 3, the guide hole 6c2, when viewed from the front, is generally L-shaped (in other words, roughly "ku"-shaped) or roughly inverted L-shaped (in other words, roughly inverted "ku"-shaped). More specifically, the guide hole 6c2 has an upper through-hole 6c2a that extends diagonally inward in the width direction of the aircraft as it goes downward, and a lower through-hole 6c2b that bends outward and downward in the width direction of the aircraft from the lower end of the upper through-hole 6c2a. Therefore, a corner portion 6c2c is formed on the front surface of each guide holder 6c, which is formed by the upper through-hole 6c2a and the lower through-hole 6c2b. In other words, the upper through-hole 6c2a extends diagonally inward and downward in the width direction of the aircraft, and the corner portion 6c2c is, in other words, a projection that protrudes toward the guide hole 6c2.

[0046] Due to its own weight and the weight of the roller member 6a, the roller arm 6b naturally rotates downward around the shaft 6c1. Therefore, when the machine is moving while planting seedlings, it is basically in a position and rotation angle that passes the lower end of the guide hole 6c2. While the machine 10 is moving, the roller arm 6b and roller member 6a are subjected to a force that pushes back from the slope of the ridge P, that is, a force that pushes diagonally upward and outward in the width direction of the machine. However, the lower penetration portion 6c2b extends in a direction approximately perpendicular to the direction of this pushing force, and the lower end of the upper corner portion 6c2c of the lower penetration portion 6c2b resists the roller arm 6b's attempt to escape upward, thus restraining the roller arm 6b by the corner portion 6c2c. In addition, as can be seen from Figure 4(a), the shaft 6c1 (see Figure 3), which is the center of rotation, is set to a position above the roller member 6a (which is the working part) when the roller arm 6b is at the lower end of the guide hole 6c2. Therefore, it is possible to prevent the roller member 6a from frequently separating from the slope of the ridge P during transplanting work. Furthermore, if excessive force is applied to the roller member 6a and roller arm 6b due to stones or other objects present on the slope of the ridge P, the roller arm 6b can be released from the lower penetration portion 6c2b of the guide hole 6c2 into the upper penetration portion 6c2a, thereby preventing damage to the roller member 6a, roller arm 6b, and guide holder 6c.

[0047] As can be seen in Figures 3 and 4, each roller arm 6b extends approximately forward above the support portion 28a of the compaction frame 28. Therefore, when the vehicle height of the vehicle body 10 is raised above a certain level and the compaction frame 28 is rotated upward around the support rod 27, each roller arm 6b is pressed upward by the support portion 28a of the compaction frame 28 and rotated upward around the shaft 6c1. In this way, when the vehicle height of the vehicle body 10 is raised above a certain level, the roller members 6a of the pair of guide rollers 6 on the left and right are also raised in addition to the compaction rollers 5, thus preventing the roller members 6a from contacting the ridges P and causing the ridges P to collapse when the machine turns.

[0048] At this time, the roller arms 6b of each guide roller 6 rotate and slide upward and outward in the width direction of the machine along the upper through-hole 6c2a, thereby widening the distance between the roller members 6a of the left and right guide rollers 6. Therefore, after the machine turns, it is easier to position the left and right roller members 6a to the left and right outer sides of the furrow P.

[0049] Furthermore, when the vehicle height of the running vehicle 10 is lowered after the machine has turned, the roller arms 6b of each guide roller 6 rotate and slide downward and inward in the width direction of the machine along the upper penetration portion 6c2a, so that the pair of roller members 6a can naturally fit to the slope of the ridge P.

[0050] Furthermore, since the compaction roller 5 moves up and down by the rotation of the compaction frame 28 around the support rod 27, the compaction roller 5 can follow the ridge surface even if the height of the ridge P changes.

[0051] Furthermore, since the upper surface of the ridge P can be pressed down by the compaction roller 5 and the slope of the ridge P can be pressed down by the pair of left and right roller members 6a, the following ability is good and the vehicle body 10 can be reliably guided in the direction in which the ridge P extends. On the other hand, Figure 5 is a diagram showing the tip of the water intake hose 38.

[0052] The transplanter 1 is equipped with an irrigation tank (not shown), and each time the planting device 3 performs a planting operation, water from the irrigation tank is supplied to the field through the planting claws 3a (see Figure 1). The end of the suction hose 38 shown in Figure 5 is inserted into the water stored in this irrigation tank, and the water is drawn up through the side of the filter 39, which is attached to the end of the suction hose 38 using a hose clamp 40, and supplied to the planting claws 3a through the water supply path. In this way, by drawing up the water from the irrigation tank through the filter 39, it is possible to prevent foreign matter other than water contained in the irrigation tank from being sent to the water supply path. The tip of the filter 39 is provided with a cap 41 to prevent the filter 39 from rubbing against the bottom of the tank, thereby protecting the filter 39.

[0053] A spring 42 extends inside the filter 39 to tension it. As shown by the dashed line in Figure 5, the diameter of the spring 42 extending inside the filter 39 is larger in the portion located inside the cap 41 than in other portions. This configuration makes it difficult for the cap 41 to come off the filter 39.

[0054] A weight 43, indicated by a dashed line, is built into the inside of the tip of the filter 39, which is located inside the cap 41. This ensures that the tip of the water intake hose 38 is reliably submerged in the water stored in the irrigation tank, allowing for a stable supply of water to the planting claws 3a.

[0055] Figure 6 is a roughly left side view of the vicinity of the base portion of the main clutch lever 18 shown in Figure 1. Figure 6(a) shows the state before the main clutch lever 18 is rotated, and Figure 6(b) shows the state after the main clutch lever 18 has been rotated.

[0056] Approximately below the main clutch lever 18, a second plate 33 is provided, positioned to the right of the first plate 32 and the first plate 33 (towards the back of the drawing), for transmitting the rotational operation of the main clutch lever 18 (see the arrow shown in Figure 6(a)) to the main clutch.

[0057] The first plate 32 has a curved shape so as not to interfere with the tube 35 into which the knob bolt 34 (see Figure 1) for adjusting the angle of the steering handle 16 is inserted. This prevents the first plate 32 from interfering with and damaging the tube 35 when the main clutch lever 18 is rotated.

[0058] When the main clutch lever 18 is rotated, the cable 37 connected to the second plate 33 (see Figure 6(b)) pulls the second plate 33 forward, causing the second plate 33 to rotate clockwise around the pivot center 36 in a left-side view. Note that in Figure 6(a), the cable 37 and other components are omitted to show the connection point of the cable 37 to the second plate 33.

[0059] While the main clutch lever 18 is rotated, as shown in Figure 6, the first plate 32 and the second plate 33 always overlap in a side view and operate while abutting each other from side to side. This prevents the end faces 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>

[0060] According to the first embodiment shown in Figures 1 to 6, as the vehicle height of the traveling vehicle body 10 is raised, the lift arm 30 moves backward. As a result, the rotating cam 29, to which the front part of the lift arm 30 is connected by a connecting pin 31, rotates clockwise in a left side view. This causes the compaction frame 28, also connected to the rotating cam 29, to rotate upward around the support rod 27. Therefore, in addition to the mechanism for adjusting the vehicle height of the traveling vehicle body 10, the compaction roller 5 can be raised in conjunction with the increase in vehicle height. Thus, even with a simple configuration, the compaction roller 5 can be raised when turning.

[0061] Furthermore, according to the first embodiment, since the compaction frame 28, to which the compaction roller 5 is attached, is rotatably mounted on the support rod 27, the compaction frame 28 naturally rotates downwards due to the weight of the compaction roller 5 and the compaction frame 28. Therefore, even if the compaction frame 28 is temporarily rotated upwards due to protrusions or stones on the ridge surface, the posture of the compaction frame 28 can be naturally returned to a downward-sloping position, and the planting depth can be stabilized.

[0062] 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 vertically, and is located above the support portion 28a of the compaction frame 28 to which the compaction roller 5 is mounted. Therefore, when the compaction roller 5 rotates upward in conjunction with the increase in vehicle height, the left and right roller arms 6b are pressed by the compaction frame and rotated upward, causing each roller member 6a to rise. Consequently, it is possible to prevent the pair of guide rollers 6 from contacting the ridge P and collapsing the ridge P during turning.

[0063] Furthermore, according to the first embodiment, the lower penetration portion 6c2b of the guide hole 6c2 of the guide holder 6c, which 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. In other words, the lower penetration portion 6c2b extends in a direction substantially perpendicular to the force applied from the slope of the ridge P. Therefore, when a force is applied to the roller arm 6b, which is in a position to pass through the lower penetration portion 6c2b due to its own weight and the weight of the roller member 6a, pushing back from the slope of the ridge P, the roller arm 6b is held down by the lower end of the corner portion 6c2c formed between the upper penetration portion 6c2a and the lower penetration portion 6c2b. Thus, it is possible to prevent the roller member 6a from frequently separating from the slope of the ridge P during planting work.

[0064] 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 can be released into the upper penetration portion 6c2a, and thus damage to the guide roller 6 can be prevented.

[0065] In addition, according to the first embodiment, when the vehicle height of the traveling vehicle 10 is lowered after the machine turns, the compaction frame 28 rotates downwards as the lift arm 30 moves forward. As a result, each roller arm 6b moves downwards along the guide hole 6c2 due to its own weight, causing the roller members 6a to move downwards and inwards in the width direction of the machine. Therefore, when the vehicle height of the traveling vehicle 10 is lowered, the pair of roller members 6a can be naturally fitted to the slope of the ridge P.

[0066] Furthermore, according to the first embodiment, since the left and right pair of guide rollers 6 are each mounted on the support rod 27 so as to be able to adjust their left and right positions, the left and right distance between the pair of guide rollers 6 can be adjusted to match the width of the furrow, thereby preventing the planting position by the planting device 3 from being disturbed from side to side. On the other hand, Figure 7 is a substantially left side view of the left crawler 45 provided in the transplanting machine 1 according to the second embodiment of the present invention.

[0067] The transplanting machine 1 according to this embodiment is equipped with 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 configured in the same way as the transplanting machine 1 according to the above embodiment, except for the points described below.

[0068] Each crawler 45 includes a drive wheel 46 that receives power from the axle 13 shown in Figures 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, a swing frame 49 located at the lower rear of the crawler 45, a front wheel 50 mounted on the front of the swing frame 49, a rear wheel 51 mounted on the rear of the swing frame 49, and a basic frame 52 that supports the swing frame 49, the drive wheel 46, and the driven wheel 47.

[0069] When the piston rod of the lifting hydraulic cylinder 70 shown in Figure 2 protrudes rearward, the pair of lifting arms 20 shown in Figures 1, 2, and 4 rotate clockwise in a left-side view, causing the left and right crawlers 45 to rotate downward around the axle 13 (specifically, clockwise in a left-side view). As a result, the height of the vehicle body 10 increases. Conversely, when the piston rod of the lifting hydraulic cylinder 70 is retracted forward, the pair of lifting arms 20 rotate forward (specifically, counterclockwise in a left-side view). This causes the left and right crawlers 45 to rotate upward around the axle 13 (specifically, counterclockwise in a left-side view), lowering the height of the vehicle body 10. In this way, since the pair of lifting arms 20 rotate when the vehicle height is raised or lowered, the compaction roller 5 and roller member 6a can be raised or lowered in conjunction with the raising or lowering of the vehicle height, similar to the first embodiment.

[0070] The following will provide a detailed explanation of the left crawler 45, but the left and right crawlers 45 are identically constructed, and the same can be said for the right crawler 45. Figure 8 is a schematic perspective view of the vicinity of the oscillating frame 49 of the left crawler 45.

[0071] The oscillating frame 49 is mounted to the basic frame 52 so as to be able to swing around the pivot center 62. When the vehicle is running or when the vehicle height is raised or lowered, the oscillating frame 49 causes the front road wheels 50 and the rear road wheels 51 to rotate around the pivot center 62.

[0072] The rear road wheel 51 comprises an outer road wheel 51a positioned outside the oscillating frame 49 in the width direction of the aircraft, an inner road wheel 51b positioned inside the oscillating frame 49 in the width direction of the aircraft, and a shaft 56 (see Figures 10, 11, 13, etc.) rotatably mounted on the oscillating frame 49. That is, the outer road wheel 51a and the inner road wheel 51b are connected to the oscillating frame 49 via the shaft 56. The shaft 56 extends in the width direction of the aircraft and is connected to the outer road wheel 51a via a bush 64 shown in Figure 11.

[0073] The rear idler wheel 51 is connected (displaced) to the rear of the oscillating frame 49 located at the lower rear of the crawler 45, and plays a role in directing the crawler belt 48, which is in contact with the field surface and extends in the front-rear direction, forward and upward. For this reason, the rear idler wheel 51 is prone to load during travel, and in addition, the rear idler wheel 51 is prone to even greater load if stones, mud, etc. enter between the oscillating frame 49 and the rear idler wheel 51. In this embodiment, various measures are taken to allow stones, mud, etc. that have entered to escape, as will be described in detail below.

[0074] Figure 9 is an enlarged left side view of the vicinity of the outer wheel 51a of the rear wheel 51 of the left crawler 45, Figure 10 is a partial longitudinal section view of the vicinity of the hub 53 of the outer wheel 51a along the line XX shown in Figure 9, and Figure 11 is a horizontal cross-sectional view of the vicinity of the outer wheel 51a along the line YY shown in Figure 9. Note that the crawler belt 48 is omitted in Figure 11 for convenience.

[0075] The outer wheel 51a of the left crawler 45 has a hub 53 located at its radial center, a rim 54 located on its outer circumference, and three spokes 55 extending radially from the hub 53 to the rim 54.

[0076] As shown in Figure 9, the three spokes 55 are arranged at 120° intervals in the circumferential direction of the hub 53. This allows for a wide three mud-escape spaces 63 to be formed between the spokes 55, enabling mud and other debris that enters the gap between the oscillating frame 49 and the rear road wheel 51 to escape outwards in the width direction of the rear road wheel 51 through the mud-escape spaces 63.

[0077] Here, as shown in Figure 11, the three spokes 55 are positioned outside the inner end of the hub 53 in the width direction of the machine body, and also outside the inner end of the rim 54 in the width direction of the machine body. Therefore, mud and other debris that enter between the oscillating frame 49 and the rear road wheel 51 are less likely to be obstructed from escaping outwards through the mud escape space 63. Furthermore, because each spoke 55 is positioned in this way, while the outer road wheel 51a is rotating freely during operation, the spokes 55 can be used to partition the three mud escape spaces 63 so that mud does not go from each mud escape space 63 to adjacent mud escape spaces 63.

[0078] Furthermore, as shown in Figure 10, the hub 53 and the three spokes 55 are formed such that the vertical dimension of the inner end in the width direction of the machine body (=inner end) is greater than the vertical dimension of the outer end (=outer end). In other words, the hub 53 and the three spokes 55 are roughly trapezoidal or triangular in a longitudinal cross-sectional view. Therefore, vibrations during operation can cause mud and other debris on the hub 53 and each spoke 55 to be thrown to the outside of the machine body, preventing it from falling between the oscillating frame 49 and the outer wheel 51a.

[0079] As shown in Figures 10 and 11, the portion of the outer road wheel 51a located radially outward from the hub 53 (in other words, the peripheral edge of the hub 53) has a shape that protrudes inward in the width direction of the machine body, thereby forming a space 58 radially inward of the protruding portion 57. The radially inward side of the protruding portion 57 is, that is, around the shaft body 56. In addition, as shown in Figures 7 and 9, the lower end of the oscillating frame 49 is set to be located above the lower end of the hub 53, and also above the lower end of the inner surface (in the radial direction of the hub 53) of the protruding portion 57 that extends inward in the width direction of the machine body.

[0080] In this way, by making the portion of the hub 53 located radially outward protrude toward the oscillating frame 49, it is possible to suppress the intrusion of mud, stones, etc. into the space between the oscillating frame 49 and the hub 53, and mud, etc. that has entered the space 58 can be discharged from the bottom of the space 58 toward the inside in the width direction of the machine body. The inner surface of the protruding portion 57, that is, the surface facing the space 58, may be configured to extend more smoothly and diagonally toward the shaft body 56 than shown in Figure 11, thereby enabling the smooth discharge of mud, etc. that has entered the space 58.

[0081] In addition, as shown in Figure 11, the rim 54 is tapered (= mortar-shaped) so that it moves further away from the hub 53 (in other words, the radial center of the outer road wheel 51a) as it moves outward in the width direction of the machine. Therefore, even if mud or other debris adheres to the radial inner portion of the rim 54 (the portion facing the mud escape space 63) during operation, it can be slid off outward in the width direction of the machine due to vibrations during operation.

[0082] On the other hand, Figure 12 is a partial cross-sectional rear view of the vicinity of the inner wheel 51b of the rear wheel 51 of the left crawler 45, and Figure 13 is a substantially perspective view showing the spring 59 provided on the inner wheel 51b shown in Figure 12 in an exposed state.

[0083] The inner road wheel 51b comprises a hub 67 located at its radial center, a rim 68 located at its outer circumference, and spokes 69 connecting the hub 67 and the rim 68, and is connected to the axle 56 so as to be slidable in the width direction of the machine body. In other words, the inner road wheel 51b is configured to slide along the axle 56.

[0084] The hub 67 of the inner road wheel 51b, like the hub 53 of the outer road wheel 51a, has a portion located radially outward (=periphery) that protrudes inward in the width direction of the machine body, thereby forming a housing space 65 inside the radially protruding portion 66 of the hub 67. The protruding portion 66 has a cylindrical shape, and the spring 59 shown in Figure 13 is housed in the housing space 65. The spring 59 is held in place by a retaining member 60 to prevent it from popping out of the housing space 65 inward in the width direction of the machine body, and furthermore, the edge of this retaining member 60 is in contact with the protruding portion 66 and locked by a locking member 61. As a result, the hub 67 and the entire inner road wheel 51b are biased outward in the width direction of the machine body, i.e., toward the oscillating frame 49, by the spring 59.

[0085] With this configuration, if mud, stones, or other debris enter between the inner road wheel 51b and the oscillating frame 49, and the force (=load) pushing the inner road wheel 51b inward in the width direction of the machine becomes excessively strong, the spring 59 will compress, causing the inner road wheel 51b to naturally slide inward along the shaft 56 in the width direction of the machine. This protects the inner road wheel 51b and widens the gap between it and the oscillating frame 49, allowing the intruded debris to be discharged downward. In addition, after the intruded debris has been discharged, the biasing force of the spring 59 can return the inner road wheel 51b to the outward direction in the width direction of the machine, thereby suppressing the intrusion of mud and other debris. <Technical significance of the second embodiment> According to the second embodiment shown in Figures 7 to 13, in addition to the effects obtained by the above embodiment, the following effects can be obtained. In other words, 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), a wide mud-escape space 63 can be created between the spokes 55, allowing mud and other debris that enters between the outer wheel 51a and the oscillating frame 49 to escape to the outside of the machine through the mud-escape space 63. In addition, as shown in Figure 11, the three spokes 55 are located outside the inner end of the rim 54 and the inner end of the hub 53 in the width direction of the machine, so they do not easily obstruct mud and other debris from escaping to the outside of the machine.

[0086] Furthermore, according to the second embodiment, the rim 54 located on the outer circumference of the outer wheel 51a of the rear wheel 51 is tapered so that it moves further away from the hub 53 as it moves outward in the width direction of the machine body. Therefore, even if mud or other debris adheres to the inner part of the rim 54 in the radial direction, the mud or debris slides off along the outer surface of the tapered rim 54 in the width direction of the machine body, effectively preventing mud or other debris from accumulating between the oscillating frame 49 and the outer wheel 51a. Consequently, damage to the rear wheel 51, which is located at the lower rear of each crawler 45 and is prone to load during operation, can be prevented.

[0087] In addition, according to the second embodiment, the hub 53 and the three spokes 55 of the outer wheel 51a of the rear wheel 51 are each formed with dimensions such that the vertical dimension of the inner end in the width direction of the machine body is larger than the vertical dimension of the outer end (for example, triangular or trapezoidal in a vertical cross-section). This allows mud and other debris that accumulates on the hub 53 and spokes 55 to be thrown to the outside of the machine body by vibrations during operation, thereby preventing mud and other debris from falling between the rear wheel and the oscillating frame.

[0088] Furthermore, according to the second embodiment, the inner wheel 51b of the rear wheel 51 is configured to slide along the shaft 56 in the width direction of the machine body, and a spring 59 is provided on the hub 67 of the inner wheel 51b that biases the inner wheel 51b outward in the width direction of the machine body. Therefore, when mud, stones, etc. enter between the inner wheel 51b and the oscillating frame 49 and an excessive load is placed on the inner wheel 51b, the inner wheel 51b can be slid inward in the width direction of the machine body against the biasing force of the spring 59 to relieve the load on the inner wheel 51b. Moreover, at this time, the gap between the inner wheel 51b and the oscillating frame 49 can be widened, so that the intruded mud and other objects can be discharged downward. In addition, after the intruded material is expelled, the biasing force of the spring 59 allows the inner road wheel 51b to be returned to the outside in the width direction of the machine, thereby suppressing the subsequent intrusion of mud and other debris.

[0089] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the invention as described in the claims, and these modifications are also included within the scope of the present invention.

[0090] For example, in each embodiment shown in Figures 1 to 13, the left base 28b of the compaction frame 28 is connected to a rotating cam 29 mounted near the left end of the support rod 27, together with a lift arm 30 extending from the left lifting arm 20. However, instead of this configuration, or in addition to this configuration, a separate lift arm may be extended forward from the right lifting arm 20, and this lift arm may be connected to a rotating cam separately provided near the right end of the support rod 27, together with the right base 28b of the compaction frame 28.

[0091] Furthermore, in each embodiment shown in Figures 1 to 13, the base 28b of the compaction frame 28 and the front end of the lift arm 30 are connected to the rotating cam 29 by a single pin 31. However, it is not necessarily required to connect the base 28b of the compaction frame 28 to the rotating cam 29 together with the front end of the lift arm 30. The base 28b of the compaction frame 28 and the front end of the lift arm 30 may be connected to the rotating cam 29 separately. [Explanation of Symbols]

[0092] 1 transplanter 3 Planting equipment 4. Conveying device 5. Compaction roller 6 Guide rollers 7 Seedling holder 8 Front wheels 9 Rear wheels 10. Running vehicle 11 Engine 12 Transmission Case 13 axles 14 Chain Case 15. Hydraulic cylinder for horizontal control 16. Control Steering Wheel 17. Aircraft Frame 18 Bumper 19. Planting lift lever 20 Lifting Arm 21 Compression Wheel 23 Balance rod 24 connecting rods 25 First transmission device 26. Second transmission device 27 Support rod 28. Compression Frame 29 Rotating Cam 30 Lift Arms 31 Connecting pins 32 First Plate 33 Second Plate 34 Knob Bolts 35 tubes 36 rotational centers 37 Cables 38. Water intake hose 39 Filters 40 Hose clamps 41 caps 42 Springs 43 Weight 45 Crawler 46 drive wheels 47 Driven wheel 48 Crawler Belt 49. Oscillating Frame 50 Front road wheels 51 Rear road wheels 52 Basic Frames 53 Hub (Outer Road Wheel) 54 rim 55 spokes 56. Rear road wheel axle 57. Protruding part (outer road wheel) 58 Space 59 Spring 60 Retaining member 61 Locking member 62. Oscillating Center 63 Mud escape space 64 Bush 65 Containment space 66. Protruding part (inner road wheel) 67 Hub (inner road wheel) 68 Rim (inner road wheel) 69 spokes (inner wheel) 70 Hydraulic cylinder for lifting

Claims

1. A transplanting machine for planting transplanted crops in a field. A vehicle body configured to allow the vehicle height to be raised and lowered, A planting device for transplanting plants into the field, A support rod is attached to the bumper of the aforementioned vehicle body and extends in the left-right direction, In a plan view, the compression frame has a roughly U-shape with the open portion facing rearward, and its left and right rear ends are rotatably attached near the left and right ends of the support rod, A compaction roller is rotatably mounted in the left and right center of the aforementioned compaction frame to level the unevenness of the ridge surface, A rotating cam is mounted near the left and / or right end of the support rod so as to be rotatable around the support rod, It includes a lift arm that moves forward and backward in conjunction with the raising and lowering of the vehicle height of the aforementioned vehicle body, The rotating cam is connected to the front end of the lift arm and both left and right sides and / or one of the left and right sides of the compaction frame, and is configured to rotate clockwise around the support rod in a left side view when the lift arm moves rearward in conjunction with the rise in the height of the traveling vehicle body, thereby causing the compaction roller to rise as the compaction frame connected to the rotating cam rotates clockwise around the support rod in a left side view.

2. The vehicle is equipped with a pair of left and right guide rollers that contact the slopes on the left and right sides of the ridge, thereby guiding the vehicle to travel along the ridge in the field. Each of the left and right guide rollers comprises a frame-shaped guide holder fixed to the support rod so as to be able to adjust its left-right position, a roller arm connected to the guide holder so as to be able to rotate vertically and slide horizontally, and a roller member fixed to the front of the roller arm and in contact with either the left or right slope of the ridge. Guide holes are formed on the front surface of each guide holder to limit the rotation angle and lateral position of the roller arm, and each roller arm is positioned above the portion of the compaction frame that extends in the lateral direction, which is roughly U-shaped, and extends from inside the guide holder through the guide holes to the front of the guide holder. The transplanting machine according to claim 1, characterized in that the guide hole comprises an upper through portion extending diagonally inward and downward in the width direction of the machine body, and a lower through portion extending diagonally outward and downward in the width direction of the machine body from the lower end of the upper through portion, and the guide hole as a whole has a roughly V-shape when viewed from the front.

3. The aforementioned vehicle body is equipped with a pair of left and right crawlers, The aforementioned crawler is equipped with a swingable frame on the lower rear of each left and right crawler, with a front wheel positioned at the front of the swingable frame and a rear wheel positioned at the rear of the swingable frame. The aforementioned rear road wheel comprises an inner road wheel located inside the oscillating frame in the width direction of the aircraft body, and an outer road wheel located outside the frame. The outer wheel comprises a hub located at its radial center, a rim located at its outer circumference, and three spokes extending from the hub to the rim. The rim is tapered so that it moves away from the hub as it moves outward in the width direction of the aircraft. The transplanting machine according to claim 1 or 2, characterized in that 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 machine body.

4. The transplanting machine according to claim 3, characterized in that the hub and the three spokes are each formed such that the vertical dimension of the inner end in the width direction of the machine body is greater than the vertical dimension of the outer end.

5. The aforementioned rear road wheel extends in the width direction of the aircraft and includes a shaft body that connects the outer road wheel and the inner road wheel. The inner wheel is configured to slide along the shaft and is equipped with a hub located at the radial center of the inner wheel. The portion of the hub located radially outward has a shape that protrudes inward in the width direction of the aircraft, thereby forming a housing space radially inward. The transplanter according to claim 3, characterized in that the aforementioned housing space houses a spring that biases the inner road wheel outward in the width direction of the machine body.

Images