JP2005080620A - Seedling transplanting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seedling transplanting machine that is equipped with a seedling transplanting unit that can minimize holes bored on a mulch film with a simple mechanical constitution. <P>SOLUTION: A seedling receiver 26 that receives vine seedlings which are arranged in the longitudinal direction is conveyed to a lower side by a seedling-conveying part 3 and the vine seedlings are taken out from the seedling conveying part 3 with a pair of seedling planting units 4 and are planted on a farm ground. In this case, supporting arms 4b<SB>1</SB>and 4b<SB>2</SB>running on previously set planting traces of a pair of the seedling planting unit 4 are made narrower in the vertical direction than the width in the transverse direction when viewed transversely whereby the pulling out of the planted seedlings can be minimized and the size of the holes bored on the mulch film can be made relatively small. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seedling transplanter for planting vine seedlings such as sweet potato seedlings in a field.

  Conventionally, as shown in the following Patent Document 1, a planting device provided with a traveling device that self-propels the aircraft and a seedling planting body that holds the base of the vine-shaped seedling and draws a closed-loop trajectory in a side view of the aircraft A seedling transplanter with a device is known.

  In the seedling transplanting machine, the seedling planting body holds and descends by acting so as to press down the base of the vine-shaped seedling, and enters the soil of the field, and then moves in a direction along the aircraft traveling direction, After moving a set distance in this direction, it is configured to move up and get out of the soil.

In addition, as shown in Patent Document 2 below, the present applicant does not catch the multifilm on the tip of the planted body when planting the seedling, and the sweetness after planting the seedling. A seedling transplanting machine has been developed that breaks the multi-film above the vine seedlings such as shochu seedlings reliably and smoothly so that the seedling planted body can be easily pulled out from the soil.
JP 2002-305918 A Japanese Patent Application No. 2002-279392

Each of the seedling transplanting machines described in Patent Documents 1 and ₂ includes a support portion 4b including a pair of support arms 4b ₁ and 4b ₂ and a pair of seedling transplanting clamps for holding a seedling at the tip of the support portion 4b. 4a ₁ , 4a _2, and a pair of opening / closing members 4c ₁ , 4c ₂ that support the bases of the support arms 4b ₁ , 4b ₂ of the support part 4b, and rotation to the base side of the opening / closing members 4c ₁ , 4c ₂ and a planting body 4 consisting of a roller 4d _1, 4d ₂ Metropolitan provided freely, but if multiple film is laid in the field, it is necessary to instill seedling breaks through the multi-film. The seedling planting body 4 described in Patent Document 1 is not particularly designed for multi-films, but the one described in Patent Document 2 is a multi-planting system for holding seedlings in order to make the holes of the multifilm as small as possible. A knife for cutting the film is provided so that the holding tools 4a ₁ and 4a ₂ can easily cut the multi-film and not catch it after planting the seedling.
An object of the present invention is to improve the seedling planting body 4 of the seedling transplanting machine described in Patent Documents 1 and 2 above, and to provide seedling transplanting with a seedling planting body that makes the hole of the multifilm as small as possible with a simpler configuration Is to provide a machine.

The present invention employs the following configuration in order to solve the above problems.
According to the first aspect of the present invention, a plurality of seedling storage portions 26 for storing vine seedlings one by one in a posture facing in the front-rear direction are provided, and the seedling storage portions 26 are arranged on the rotary shaft 33 whose axis is directed in the front-rear direction of the body. A seedling transport unit 3 that rotates around and rotates in a line around the seedlings, and a pair of seedlings for taking out the vine seedlings transported downward by the seedling transport unit 3 from the seedling transport unit 3 and planting them in the field in Tsuketai 4 and seedling transplantation machine wherein the seedling planting member 4, the support arm 4b _1, 4b ₂ operating at planting trajectory preset, the distal end of the support arm 4b _1, 4b ₂ there constructed from the vine-like seedling seedling planting pincer 4a ₁ sandwiching, 4a ₂ Prefecture, the support arm 4b _1, 4b ₂ is a vertical width L ₁ in the lateral direction in cross section view with respect to the longitudinal direction a seedling transplantation machine having a narrower seedlings planting body than the width L _2.
The invention according to claim 2 is the seedling transplanter according to claim 1 in which the transverse section of the support arms 4a ₁ , 4a ₂ of the seedling planting body 4 with respect to the longitudinal direction is formed in an elliptical shape.

According to the first aspect of the invention, that a relatively small width L ₁ in the lateral direction in cross section view with respect to the longitudinal direction of the support arm 4b, when exiting from the time and field support arm 4b is inserted in the field The resistance can be reduced, and the size of the taken-out seedlings and multi-film cut holes can be made relatively small.

  According to the invention of claim 2, while having the effect of claim 1, the transverse cross section with respect to the longitudinal direction of the support arm 4b, which has relatively little influence on taking-out of planted seedlings and the cut hole of the multi-film The strength of the support arm 4b can be maintained by making the width in the left-right direction relatively large in view, the resistance of the support arm in the field is reduced, and the support arm can move more smoothly in the field. It is not necessary to increase the diameter of the support arm 4b in order to increase the strength.

A seedling transplanter according to an embodiment of the present invention will be described with reference to the drawings.
A case where a sweet potato seedling is planted as a vine-shaped seedling will be described as an example. In the following description of the illustrated example, when referring to the front or rear, the side on which the steering handle 2 is disposed is referred to as the rear, the opposite side, that is, the side on which the engine 5 is disposed is referred to as the front, and is referred to as right or left. Sometimes, the right hand side is referred to as the right, and the left hand side is referred to as the left, as viewed from the operator standing at the rear of the aircraft toward the front of the aircraft.

  1 is a side view of a seedling transplanting machine according to an embodiment of the present invention, FIG. 2 is a plan view of the seedling transplanting machine of FIG. 1, and FIG. 3 is a seedling transporting unit and a seedling planting body of the seedling transplanting machine of FIG. 4 is a partially omitted perspective view, and FIG. 4 is a partially omitted rear view showing the seedling conveying unit and the seedling planting body of the seedling transplanting machine of FIG.

  The seedling transplanting machine has a seedling transporting unit 3 for transporting sweet potato seedlings to a machine body provided with a traveling device 1 and a steering handle 2, and a seedling planting body 4 for planting seedlings transported by the seedling transporting unit 3 in a field. It is a seedling transplanter equipped with.

  In the illustrated example, the traveling device 1 includes an engine 5, a pair of left and right rear wheels 6 and 6 that are driven and rotated by transmission of the power of the engine 5, and left and right wheels that are rotatably supported in front of the wheels 6 and 6. A pair of front wheels 7 and 7 are provided.

  A mission case 8 is disposed at the rear of the engine 5, and the mission case 8 has a case portion extending from the left side of the engine 5 to the left side of the engine 5, and this is connected to the left side of the engine 5. The output shaft of the engine 5 enters the case portion and power is transmitted to the transmission mechanism in the transmission case 8. Transmission cases 9 and 9 are rotatably attached to the left and right sides of the transmission case 8, and the tip of the wheel drive shaft extending from the transmission case 8 to the left and right outer sides is centered on the transmission cases 9 and 9. The power for traveling is transmitted to the transmission mechanism in the transmission cases 9, 9. The traveling power is transmitted to the axles 10 and 10 projecting to the rear end side side through the transmission mechanism in the transmission cases 9 and 9, and is transmitted to the rear wheels 6 and 6. It is supposed to be.

  Further, upwardly extending arms 11, 11 are integrally attached to the attachment portions of the transmission cases 9, 9 to the transmission case 8, and this is the tip of the piston rod of the lifting hydraulic cylinder 12 fixed to the transmission case 8. Are connected to the left and right sides of a balance rod 13 that is pivotably mounted around a vertical axis. The right side of the connecting portion is connected by a rod 14, and the left side is connected by a left / right horizontal control hydraulic cylinder 15 which can be expanded and contracted.

  When the elevating hydraulic cylinder 12 is actuated and the piston rod 12a protrudes rearward, the left and right arms 11 and 11 are rotated rearward, and the transmission cases 9 and 9 are rotated downward accordingly. The aircraft rises. On the other hand, when the piston rod 12a of the lifting hydraulic cylinder 12 is retracted forward, the left and right arms 11 and 11 are rotated forward, and the transmission cases 9 and 9 are rotated upward accordingly. Descends. The raising / lowering hydraulic cylinder 12 is configured to operate the airframe to a set height with respect to the height of the heel surface based on the detection result of the sensor 24 that detects the height of the heel surface relative to the airframe. It is also configured to operate so as to raise or lower the airframe by manual operation of an operating tool disposed in the vicinity of the steering handle 2.

  Further, when the left / right horizontal control hydraulic cylinder 15 is expanded and contracted, the balance rod 13 is rotated around the vertical axis connected to the tip of the piston rod 12a of the lifting hydraulic cylinder 12 at the center of the left / right to rotate left / right. The transmission cases 9 and 9 are moved up and down alternately to incline the aircraft from side to side. The left / right horizontal control hydraulic cylinder 15 is configured to actuate the airframe horizontally from the left and right based on the detection result of a sensor (not shown) that detects the left / right inclination of the airframe relative to the left / right horizontal.

  The left and right front wheels 7 and 7 are fixed to the side of the lower end portion of the arm portion that extends downward at the left and right side portions of the front wheel support frame 16 that is rotatably mounted around the axial center in the front-rear direction at the left and right center position below the engine 5. It is attached to the axles 17 and 17 rotatably. Accordingly, the left and right front wheels 7 and 7 are free to roll around the longitudinal center of the left and right center of the fuselage.

  The steering handle 2 is attached to a rear end portion of a handle frame 2b whose front end portion is fixed to the mission case 8. The handle frame 2b is disposed at a position deviated from the left and right center of the machine body to the right and extends rearward, and extends obliquely rearward and upward from the front and rear intermediate portion. The steering handle 2 extends rearward left and right from the rear end portion of the handle frame 2b, and the rear end portions thereof serve as grip portions 2a and 2a of the steering handle 2. The left and right grip portions 2a, 2a of the steering handle 2 are set to an appropriate height so that the operator can easily grip the grip portions 2a, 2a with hands. In the illustrated example, the grip portions 2a and 2a are divided into left and right, but the left and right rear end portions of the steering handle 2 may be connected to each other on the left and right sides, and the connecting portion may be used as the grip portion.

  Although the traveling device 1 has a four-wheel configuration, the traveling device 1 may have a two-wheel configuration including only a pair of left and right drive wheels, or may be a pressure-reducing wheel that rolls on the upper surface instead of the front wheels. Moreover, it is good also as a crawler type traveling apparatus.

Next, the seedling planting body 4 and the seedling transport unit 3 will be described.
The seedling planting body 4 is connected to a drive unit that moves the seedling planting action part 4a up and down, and the seedling planting action part 4a (the pair of seedling planting clamps 4a ₁ and 4a ₂ ) of the seedling planting body 4 transports the seedlings. The seedlings that act on the seedlings conveyed by the unit 3 are planted in the field.

  The drive unit that drives the seedling planting body 4 is provided in a planting transmission case 18 that includes a transmission mechanism that receives power for driving the seedling planting body 4 from the inside of the transmission case 8 and transmits it. As shown in the figure, the planting transmission case 18 has a front portion connected to the rear portion of the mission case 8, and a first case portion 18a extending rearward and obliquely upward therefrom, and an upper left side portion of the first case portion 18a. Planted in a second case portion 18b that is pivotally mounted around the axial center of the direction and extends leftward, and a third case portion 18c that is fixed to the left end portion of the second case portion 18b and extends obliquely downward thereafter. A transmission mechanism for transmitting power for driving the body 4 is provided.

  Note that the transmission mechanism built in the first case portion 18a includes an intermittent drive mechanism that stops the seedling planting body 4 at a position where the seedling planting body 4 is moved up and down or in the vicinity thereof, a seedling planting body 4 and a seedling planting body. A clutch mechanism for stopping the operation of the transport unit 3. The time to stop by the intermittent drive mechanism is adjusted by a speed change mechanism provided in the intermittent drive mechanism, and the adjustment between the seedling planting stocks by the seedling planting body 4 is adjusted by this adjustment.

  The seedling planting body 4 is driven by being connected to a driving arm 19 that rotates as a driving portion thereof. The drive arm 19 is fixed to a drive shaft 20 that projects from the rear right side of the third case portion 18c and rotates. And the upper end part of the support link part 21 of the seedling planting body 4 is rotatably connected to the tip part of the drive arm 19, and the front end part of the swing link 22 is rotatably connected to the lower end part of the support link part 21. ing.

  The rear end portion of the swing link 22 is rotatably supported by a support shaft 25. One end portion of the support shaft 25 is rotatably supported by a rear end portion of a support frame 23 provided integrally with the third case portion 18c.

Further, as shown in the enlarged perspective view of the seedling planting body 4 portion in FIG. 3, the seedling planting body 4 holds the seedling between the support portion 4b composed of a pair of support arms 4b ₁ and 4b ₂ and the tip of the support portion 4b. A pair of seedling planting clamps 4a ₁ , 4a ₂ , a pair of opening / closing members 4c ₁ , 4c ₂ supporting the bases of the support arms 4b ₁ , 4b ₂ of the support portion 4b, and the opening / closing members 4c ₁ , 4c ₂ is composed of rollers 4d ₁ and 4d ₂ rotatably provided on the base side. The pair of opening / closing members 4c ₁ , 4c ₂ intersect with each other at their intermediate portions, and are normally urged by a spring 4e in a direction to close the holding tools 4a ₁ , 4a ₂ . Further, the rollers 4d ₁ and 4d ₂ are in contact with cam surfaces formed on the left and right side surfaces of a disc-shaped cam 54 described later.

The cam 54 is attached so as to rotate integrally with a connecting shaft 55 that is integrally attached to the distal end portion of the drive arm 19 and is rotatably attached to the upper end portion of the support link portion 21. The cam surfaces formed on the left and right side surfaces of the disc-shaped cam 54 are configured by changing the thickness on the left and right sides of the disc outer peripheral side with which the rollers 4d ₁ , 4d ₂ abut, and a pair of clamping tools 4a ₁ , 4a ₂ takes out the seedling from the seedling transport section 3 and takes the seedling into the soil so that it is closed in the section where the seedling is sandwiched and opened and closed in other sections. Yes. The cam 54 thus formed with the cam surface is attached by adjusting the attachment posture with reference to the posture of the drive arm 19 so that the holding members 4a ₁ and 4a ₂ are in the phase of the cam surface that opens and closes as described above. .

Accordingly, when the drive shaft 20 is driven to rotate and the drive arm 19 is rotated, the trajectory set by the support link portion 21 rotatably connected to the tip end portion of the drive arm 19 and the lower end portion of the swing link 22 is set. In addition, the cam surface on the outer peripheral side of the disk with which the rollers 4d ₁ and 4d ₂ come into contact with the left and right sides of the cam 54 rotates with respect to the rollers 4d ₁ and 4d ₂ . Under the action of the cam surface of the rotating cam 54, the left and right upper ends of the opening and closing members 4c ₁ and 4c ₂ are expanded and contracted to the left and right, and the support arms 4b ₁ and 4b ₂ are opened and closed to the left and right. 4a ₁ and 4a ₂ open and close.

As a result, the pair of holding tools 4a ₁ and 4a ₂ of the seedling planting body 4 are closed when passing through the seedling picking point P of the seedling transporting section 3, and sandwich the base side portion of the vine seedling transported there. To do. And after plunging into the soil with the holding tools 4a ₁ and 4a ₂ closed, the holding tools 4a ₁ and 4a ₂ are moved in a direction along the aircraft traveling direction, and the sandwiched seedling is inserted into the soil. Then, after moving the set distance in the direction along the aircraft traveling direction, the holding tools 4a ₁ and 4a ₂ open to release the seedlings, and then move up and come out of the soil.

By the way, by providing an adjustment mechanism that allows the connecting shaft 55 to be integrally attached to the tip of the drive arm 19 to be pivotally adjusted around its axis without changing the attachment position of the drive arm 19, It is possible to easily adjust the opening / closing timing of the holding tools 4a ₁ and 4a ₂ by moving and adjusting the cam surface of the cam 54 attached so as to rotate integrally with the connecting shaft 55 around the axis of the connecting shaft 55.

Since the pair of the tip of the seedling planting pincer 4a _1, 4a ₂ by attaching slidably in the lateral direction along the cam 54 to the connecting link 55 also can be finely adjusted in the lateral direction, the planting pincer 4a _1, 4a ₂ when removing the seedlings from the seedling accommodating portion 26 of the seedling transport unit 3, when the position of the stem supporting member 26c and planting pincer 4a _1, 4a ₂ are shifted to the right and left, seedling planting pincer as the If the tip positions of 4a ₁ and 4a ₂ are finely adjusted to the left and right, the positional deviation can be easily eliminated.

  With the above-described configuration, when the drive arm 19 is driven to rotate, the seedling planting body 4 at the tip (lower end) of the seedling planting body 4 integral with the support link portion 21 has a locus as shown in FIG. The movement is performed while drawing T or locus T ′ (FIG. 10). A trajectory T as shown in FIG. 9 is a motion trajectory drawn by the seedling planting operation unit 4a with respect to the aircraft when the aircraft is stopped, and a trajectory T ′ shown in FIG. It is the movement locus | trajectory which the seedling planting action part 4a draws with respect to the agricultural field at the time of doing.

The support arm 4b (4b ₁ , 4b ₂ ) portion of the seedling planting body 4 may be bent depending on the field conditions in order to insert deeply long when planting seedlings. However, in order to increase the strength of the support arm 4b (4b ₁ , 4b ₂ ), it is conceivable to increase the arm diameter. However, if the arm is increased, the planted seedlings are taken out and the cut holes of the multifilm are increased.

  Therefore, as shown in FIG. 6 (a), the cross section of the curved portion of the support arm 4b that has an effect on the taking-out of planted seedlings and the cut holes of the multi-film is made elliptical. Then, as shown in the S1-S1 cross section and the S2-S2 cross sectional view of FIG. 6A of FIG. 6B, the vertical width of the support arm 4b that moves in the vertical direction at the time of seedling planting is relatively small (for example, 8 mm) and the width in the left-right direction is relatively large (for example, 10 mm).

  By making the width of the support arm 4b in the left-right direction relatively small, it is possible to reduce resistance when the support arm 4b is inserted into and out of the field. The influence on the size of can be made relatively small. Moreover, the strength of the support arm 4b can be maintained by relatively increasing the width in the left-right direction of the support arm 4b, which has a relatively small influence on the size of the taken-out seedlings and the cut holes of the multifilm.

As shown in FIGS. 7 and 8, a scraper 51 for cleaning the inside and outside of the seedling planting clamp 4a (4a ₁ , 4a ₂ ) of the seedling planting body 4 is provided in the vicinity of the clamp 4a and supports the upper end of the scraper 51 A structure supported by the frame 23 may be adopted.

As shown in FIG. 8 (FIG. 8 (a) is a bottom perspective view, FIG. 8 (b) is a top perspective view, FIG. 8 (c) is a plan view, and FIG. 8 (d) is a side view) The inner scraper 51a has a squeezed end for cleaning the groove, and the outer scraper 51b is sandwiched between the plate-shaped members 4a (4a ₁ , 4a ₁ , and the like) as a double structure of an elastic inner scraper 51a and a plate-shaped outer scraper 51b. A plurality of slits 51b ₁ through which 4a ₂ ) pass is provided.

When the clamping tool 4a passes through the slit 51b ₁ , the multi-film or mud adhering to the inner side surface (4a ₁₁ , 4a ₁₂ ) and the outer side surface (4a ₁₂ , 4a ₂₂ ) of the clamping tool 4a (4a ₁ , 4a ₂ ) Can be removed. In particular the inner surfaces of the clamping device 4a (4a _11, 4a ₁₂₎ wider than the slit 51b ₁ width scraper 51b to clean the outer surface of the width clamping device 4a of the inner scraper 51a to clean (4a _12, 4a ₂₂₎ the doing, when the Kyojigu 4a passes through the slit 51b _1, that the inner scraper 51a deflects, remove mulch film or mud adhering to the inner surface of the pincer 4a (4a _11, 4a ₁₂₎ with spring effect can do.

  Without the scraper 51, there was a problem that soil or multi-film cut ends adhered to both the inside and the outside of the holding tool 4a, and the holes in the multi-film became large or the seedling was taken out. However, such an inconvenience was solved in this example.

  The structure of the schematic drive system of the seedling planting body 4 will be described. FIG. 5 shows a schematic drive system of the seedling transport unit 3 and the seedling planting body 4, and FIG. 9 shows a schematic cross-sectional view of the drive system in the cases 18b and 18c.

  A transmission system that transmits power to the seedling planting body 4 (on the transmission path), a speed change transmission unit that can change the speed at which the planting body 40 moves in the direction along the aircraft traveling direction in the soil, that is, seedling planting A speed change transmission unit 80 that can change the average movement speed of a section from a position where the seedling planting operation part 4a of the body 4 starts moving in the direction along the aircraft traveling direction to a position where movement in the direction ends in the soil. Is provided.

  The transmission transmission unit 80 is provided with a plurality of transmission units with the same gear ratio that have different transmission rotational speeds when the seedling planting action unit 4a of the planting body 40 moves in the direction along the aircraft traveling direction in the soil, There is provided switching operation means for selectively switching the plurality of transmission parts to the transmission state. Further, at least one of the plurality of transmission parts is constituted by an inconstant speed transmission part such as an eccentric or non-circular gear or a sprocket.

  Further, as shown in FIGS. 5 and 9, the inconstant speed transmission portion is an inconstant speed transmission gear pair with an eccentric or non-circular gear pair in which the pitch circle radius of the gear teeth changes during one rotation. If the other transmission part is provided as a constant speed transmission gear pair or another non-constant speed transmission gear pair so that it can be switched between the transmission state by the former transmission part and the transmission state by the latter transmission part, The rotation ratio between the plurality of gears attached to the input shaft and the plurality of gears attached to the lower transmission side meshing with each of the gears is set to 1: 1, and the plurality of gears attached to the input shaft on the upper transmission side are the input A plurality of gears mounted so as to rotate integrally with the shaft and mounted on the lower transmission side are rotatably mounted on the output shaft, and the switching operation means is one of a plurality of gears mounted on the lower transmission side. Only rotate together with the output shaft State To Setsu換Ru so configured, and, the output shaft and the gear and configured to rotate integrally engaged with each one place. Thereby, the phase of the inconstant speed transmission portion is not shifted by the operation of the switching operation means, and the switching operation can be performed easily and accurately.

  A specific example of the speed change transmission unit 80 shown in FIG. 9 will be described. The speed change transmission unit 80 is unequal with a constant speed transmission unit that transmits power via circular gears 83 and 87 that transmit at a constant speed between a transmission shaft 85 that serves as an input shaft and a transmission shaft 86 that serves as an output shaft. An inconstant speed transmission portion that transmits via the eccentric gears 82 and 93 that transmit at high speed is provided in parallel, and the rotation ratio of the constant speed transmission portion and the rotation ratio of the inconstant speed transmission portion are 1: 1 respectively. A switching operation mechanism is provided for switching between the transmission state via the constant speed transmission portion and the transmission state via the non-constant speed transmission portion. In the state of transmission via the inconstant speed transmission portion, the teeth of the short diameter portion of the eccentric gear 82 on the transmission shaft 85 side serving as the input shaft are the long diameter portions of the eccentric gear 93 on the transmission shaft 86 side serving as the output shaft. When the teeth are engaged, that is, in a slow transmission state, the seedling planting action portion 4a of the seedling planting body 4 enters the soil and moves in a direction along the aircraft traveling direction. As a result, when the machine body moves forward while the seedling planting body 4 operates in the trajectory T, when switching to the transmission state via the constant speed transmission unit, the planting body 4 operates in the trajectory T ′ indicated by the one-dot chain line in FIG. When switching to the transmission state via the inconstant speed transmission section, the trajectory T ″ indicated by the two-dot chain line in FIG. 10 operates, and the trajectory T ″ during this inconstant speed transmission is the same as that during the constant speed transmission. Compared with the trajectory T ′, the distance that the tip of the seedling planting body 4 moves in the direction along the airframe traveling direction after the tip of the seedling planting body 4 enters the soil is shortened. Therefore, as shown in FIG. 11, the insertion length of the seedling at the time of constant speed transmission is longer than that at the time of non-uniform speed transmission, and the insertion length of the seedling at the time of non-uniform speed transmission is longer than that at the time of constant speed transmission. Shorter. In the inconstant speed transmission portion, the teeth of the long diameter portion of the eccentric gear 82 on the input shaft (transmission shaft 85) side mesh with the teeth of the short diameter portion of the eccentric gear 93 on the output shaft (transmission shaft 86) side. Is set so that the seedling planting action part 4a of the seedling planting body 4 enters the soil and moves in the direction along the traveling direction of the aircraft when it is in a fast transmission state, Compared with the trajectory T ′, the distance that the seedling planting body 4 moves in the direction along the airframe traveling direction after the tip of the seedling planting body 4 enters the soil becomes longer, and the insertion length of the seedling becomes longer. The inconstant speed transmission unit set in this way can be further added to the transmission unit 80, replaced with the constant speed transmission unit, or the setting of the inconstant speed transmission unit can be changed in this way. .

  9, the input shaft is a transmission shaft 85 protruding from the second case portion 18b of the planting transmission case 18 into the third case 18c. An eccentric gear 82 and a circular gear 83 are attached to a portion protruding into the case 18c so as to engage with a key attached to the transmission shaft 85 and rotate integrally, and the gears 82 and 83 mesh with the gears 82 and 83, respectively. A core gear 93 and a circular gear 87 are attached to a transmission shaft 86 which is an output shaft provided in the third case 18c. The eccentric gear 93 and the circular gear 87 are selectively switched from a state of free rotation with respect to the transmission shaft 86 to a state of rotating integrally with the transmission shaft 86 by a switching operation mechanism. A sprocket 89 is attached to the transmission shaft 86 so as to rotate integrally. A chain 89a is hung between the sprocket 89 and a sprocket attached to the drive shaft 20 provided at the rear end of the third case 18c. The power that has passed through the transmission section 80 drives the seedling planting body 4.

  The switching operation mechanism has a shift key 91a that is slidable in the axial direction in a key groove formed from an attachment portion of the eccentric gear 93 to an attachment portion of the circular gear 87 in one axial portion of the outer periphery of the transmission shaft 86. The shifter 91b is attached to the transmission shaft 86 so as to be slidable in the axial direction while being engaged with the shift key 91a in the axial direction. The shifter 91b engages with a shift pin 91 that is moved in the axial direction by operation of a shift lever 90 attached to the outside of the third case 18c. With the shift lever 90 moved to the position on the input shaft (transmission shaft 85) side, the shifter 91b is moved to the circular gear 87 side (left side in FIG. 9) and the shift key 91a is fitted in the key groove of the circular gear 87. Thus, a constant speed transmission state via the circular gears 83 and 87 is obtained. When the shift lever 90 is moved in the direction of arrow F in FIG. 9 and switched to the output shaft (transmission shaft 86) side position, the shift pin 91 is rotated in the direction of arrow G in FIG. 9 and the shifter 91b is moved to the eccentric gear 93 side. The shift key 91a is fitted into the key groove of the eccentric gear 93 and switched to an inconstant speed transmission state via the eccentric gears 82 and 93.

  When the shift lever 90 is set to an intermediate position between the input shaft (transmission shaft 85) side position and the output shaft (transmission shaft 86) side position, the shift key 91a does not fit into the key groove of the circular gear 87 and the eccentric gear 93. It becomes a non-transmission state that does not fit into the keyway. In this way, the switching operation means is configured to be capable of switching operation to the non-transmission state in which the transmission from the input shaft side to the output shaft side of the speed change transmission unit 80 is cut off, thereby stopping the operation of the seedling planting body 4 It can also be used as a clutch operating device.

  As shown in FIG. 4, the seedling transport unit 3 is transported by the upper lateral transport unit 3a that transports the seedling storage unit 26 in the transport direction C from the left and right outer sides to the inner side on the upper side of the machine body, and the upper lateral transport unit 3a. The lower seeding container 26 is transported downward toward the seed picking point P where the seedling planting body 4 takes out the seedlings on the lower side of the machine body, and the seedling container 26 transported by the lowering transport part 3b And a rising transport unit 3c that transports from the seedling extraction point P obliquely upward to the outside of the machine body and returns to the transport start end side of the upper lateral transport unit 3a.

  In addition, the seedling transporting section 3 has a wide width that can be freely bent into a rotating body 29, 29 that rotates to be driven and a plurality of rotating bodies 30, 31, 32 that freely rotate so as to form the transporting sections 3a, 3b, 3c. The endless belt 26a is wound around, and a large number of plate-like partition members 26b extending in the front-rear direction are provided on the outer peripheral surface of the wide endless belt 26a at a set interval in the circumferential direction, and are sandwiched by the partition members 26b in the circumferential direction. Each of the locations is configured as a seedling storage portion 26. A seedling holding part 26c is provided for holding the base side part of the vine seedling by left and right seedling holding members at the front and rear end parts of the portion sandwiched in the circumferential direction by the partition member 26b of the wide endless belt 26a. A large number of feed holes 26d (FIG. 1) are formed at circumferentially set intervals on both front and rear ends of the wide endless belt 26a, and the protrusions on the outer peripheral portions of the drive rotators 29 and 29 engage with the feed holes 26d, thereby wide endlessly. The belt 26a is driven to go around. In the illustrated example, the seedling holding part 26c is configured by a brush body in which the hair tip faces the seedling holding member on the lower side in the seedling transport direction, and the seedling holding member on the lower side in the seedling transporting direction is the seedling holding member on the upper side in the seedling transporting direction. It is comprised by elastic members, such as sponge, It is set as the structure which pushes and clamps the base side part of a vine-like seedling between these right and left seedling clamping members.

  Rotating bodies 29 and 29 for driving and rotating the seedling conveying section 3 are attached and arranged so as to rotate integrally around the rotating shaft 33 arranged in the front-rear direction on the left and right center side on the upper side of the body, and on the left and right outer sides on the upper side of the body. Rotating bodies composed of long rollers before and after free rotation, and rotating bodies 31 and 32 composed of long rollers before and after the machine body on the lower side of the machine are arranged side by side with the seedling picking point P in between. doing. These rotary bodies 29, 29; 30, 31, 32 are supported by a support member assembled to the third case 18c and the support frame 23. And the rotary bodies 29 and 29 which drive-rotate the seedling conveyance part 3 and the rocking | fluctuation link 22 which rock-supports the lower end part of the support link 21 of the seedling planting body 4 are interlockingly connected via the transmission mechanism. The lower end portion of the interlocking rod 34 (FIG. 1) is pivotally attached to the middle portion of the swing link 22, and the upper end portion of the interlocking rod 34 is connected to an intermittent drive device 35 configured by a ratchet mechanism. The drive output unit is connected to the end of the rotating shaft 33 to which the rotating bodies 29 and 29 for driving and rotating the seedling transport unit 3 are attached. When the rocking link 22 moves up and down, the interlocking rod 34 reciprocates up and down. When the up and down reciprocation moves up, the intermittent drive device 35 outputs driving rotation, and when it moves down, the intermittent driving device 35 stops driving rotation output. It is configured. Accordingly, when the seedling planting body 4 releases the seedling in the soil and rises, the seedling transport unit 3 is driven, and the seedling planting body 4 takes out the seedling from the seedling picking point P and enters the soil to release the seedling. The seedling transport unit 3 is stopped driving until it rises.

  Since the seedling transport unit 3 is configured using the wide endless belt 62a as described above, the seedling transport unit can be reduced in weight and simplified, and the ascending transport unit 3c is provided between the left and right drive wheels 6 and 6. It is arranged in a position overlapping the driving wheel 6 from above to form a compact body structure with a short front-rear length of the body, and the tension roller 36 is pressed against the outer periphery of the wide endless belt 26a of the ascending conveyance section 3c to convey the ascending conveyance. Since the part 3c is configured to bend toward the inside of the circuit, the drive located below the ascending conveyance unit while appropriately setting the width and height of the upper horizontal conveyance unit so as not to impair the workability of the seedling supply A sufficient range of vertical movement of the wheels can be secured, and the aircraft's inclination adaptability is good.

  The partition member 26b erected on the outer peripheral surface of the wide endless belt 26a is provided with a front / rear width shorter than the front / rear width of the wide endless belt 26a, and the front end is rearward of the front end of the wide endless belt 26a. An end portion is provided in front of the rear end portion of the wide endless belt 26a, and the tension roller 36 is provided on an outer peripheral surface of the wide endless belt 26a, at one end in the front-rear direction of the belt 26a, and the belt 26a. Is arranged at a place where there is no partition member between the seedling holding portion 26c and the front and rear end portions of the partition member 26b on the other end side in the front-rear direction. As a result, the tension of the wide endless belt 26a can be applied in a well-balanced manner across the front and back, and the seedling transport unit 3 can be driven in an appropriate and smooth manner without the tension roller 36 pushing down the partition member 26b. In addition, it is possible to avoid the configuration in which the belt end extends from the seedling holding part 26c to the outside in the front-rear direction, and the seedling planting body 4 can be taken out well.

  Further, the partition member 26b erected on the outer peripheral surface of the wide endless belt 26a is provided with a front / rear width shorter than the front / rear width of the wide endless belt 26a, and the front end portion is located behind the front end portion of the wide endless belt 26a. Thus, the rear end portion is provided in front of the rear end portion of the wide endless belt 26a, and the wide endless belt 26a is provided with protrusions on the outer peripheral portions of the drive rotators 29 and 29 for driving the wide endless belt 26a. A large number of feed holes 26d to be engaged are formed at intervals in the circumferential direction, and the feed holes 26d of the wide endless belt 26a are on the outer peripheral surface of the wide endless belt 26a, and one end side in the front-rear direction of the belt 26a, The belt 26a is provided at the other end in the front-rear direction of the belt 26a at a place where there is no partition member between the seedling holding portion 26c and the front-rear end of the partition member 26b. As a result, the wide endless belt 26a can be driven and rotated in a well-balanced manner in the front and rear, the seedling transport unit 3 can be driven in an appropriate and smooth manner, and the belt end can be extended outward in the front-rear direction from the seedling holding unit 26c. This can be avoided, and the seedling planted body 4 can be taken out well.

  Further, the seedling transport unit 3 is configured using the wide endless belt 26a to reduce the weight and simplify the seedling transport unit 3, and the seedling holding unit 26c attached to the wide endless belt 26a includes The mounting member is made of a member that is not easily bent during the rotation of the seedling transport unit 3 and prevents the seedling from falling off the seedling holding unit 26c during the rotation of the seedling transport unit 3. Each of the attachment members of the holding portion 26c is attached to each attachment portion of the wide endless belt 26a at a single location in the circumferential direction, and the left and right sides of the attachment members of the seedling holding portion 26c are positioned during the circumferential rotation of the wide endless belt 26a. Since it can be separated from the outer peripheral surface of the wide endless belt 26a, the bending movement around the rotating shaft of the wide endless belt 26a (the rotating shafts of the rotating bodies 29, 29; 30, 31, 32) is smoothly performed. , Seedling transportation Part 3 becomes the orbiting movement to smoothly and accurately.

  Covering soil pressure-reducing wheels 40, 40 are provided on the left and right sides behind the seedling pick-up point P of the seedling transport unit 3 to bring the soil to the seedling transplanted body 4 and suppress the soil. The soil covering pressure reducing wheels 40 and 40 are rotatably attached to a lower portion of a support device 42 attached to a support member 41 fixed to the rear portion of the support frame 23. The frame (the third case portion 18c and the support frame 23 integral therewith) that supports the seedling transporting section 3 and the seedling planting body 4 is pivotable around the axis in the horizontal direction at the front portion as described above. Since the rear portion is configured to be movable up and down, the soil covering pressure reducing wheels 40 and 40 also function as a grounding wheel that receives the weight of the seedling transport unit 3 and the seedling planting body 4 on the ground. Further, the support device 42 is configured such that the lower support portion 42b moves up and down with respect to the upper support portion 42a by operating the handle 43 provided on the upper portion, and the covering soil pressure reducing wheels 40 and 40 can be adjusted in the vertical direction. It has become. Therefore, the height of the support of the seedling conveying unit 3 and the seedling planting body 4 is adjusted up and down by adjusting the vertical position of the covering soil pressure wheels 40 and 40. In addition, when the whole weight of the seedling transport unit 3 and the seedling planting body 4 is received on the upper surface of the cocoon, if the soil on the surface of the cocoon is soft, the cocoon may be broken. A part of the weight travels with the rear part of the frame that supports the seedling transport unit 3 and the seedling planting body 4 (attachment member fixed to the support member 41) so as to be received by the machine body supported by the traveling device 1. A spring 44 is hung on the airframe (attachment member fixed to the handle 2) supported by the apparatus 1.

  Furthermore, after the soil covering pressure reducing wheels 40 and 40 are pressed against the seedling transplanted in the field by the seedling planting body 4, the soil is pressed above the base side portion of the seedling inserted into the soil. A second pressure-reducing wheel 45 is provided which descends from above and suppresses the pressure. The second pressure wheel 45 is attached to the rear portion of the second pressure wheel support member 46 so as to be rotatable about the horizontal axis. A front portion of the second pressure-reducing wheel support member 46 is attached to a horizontal shaft 47 that is rotatably attached to a lower portion of the rear end side of the second case portion 18c, and a distal end portion is attached to the seedling planting body 4 attachment side of the horizontal shaft 47. An arm 48 having a rotating body such as a bearing attached thereto is attached to the outer periphery of a cam body 49 attached so that the tip of the arm 48 rotates integrally with the drive shaft 19 on the base side of the drive shaft 19 of the seedling planting body 4. A spring 50 is provided so as to be able to come into contact with each other and bias the second pressure-reducing wheel support member 46 upward. The cam body 49 causes the second pressure-reducing wheel support member 46 to rotate downward at an appropriate timing, and the second pressure-reducing wheel 45 descends and represses the top soil above the base portion of the seedling inserted into the soil. Note that the second pressure wheel 45 may be lowered by the urging force of the spring 50 and the second pressure wheel 45 may be lifted by the cam body 49.

  Moreover, after the soil covering pressure reducing wheels 40 and 40 pressed the soil against the seedling transplanted in the field by the seedling planting body 4, the soil brought up above the base side portion of the seedling inserted into the soil of the straw. On the other hand, instead of providing the second pressure reducing wheel 45 that descends from the upper side and suppresses pressure, as shown in FIGS. 12 and 13, the side surface that suppresses one side surface of the soil brought close to the base side portion of the seedling is suppressed. You may employ | adopt the structure which provides the knocking pressure wheel 64. FIG.

  12 is supported by the front end portion of a pressure-reducing wheel support arm 65 that is rotatably provided at the rear end portion of the support frame 23 that is provided integrally with the third case portion 18c of the mission case 8. As shown in FIG. Has been. Further, the pressure-reducing wheel support arm 65 is supported via a joint rod 68 at the rear end portion of a swing arm 66 whose front end side is swingably supported on the side surface of the support frame 23. A roller 69 provided at the front end is disposed so as to abut against a pressure-reducing cam 70 that is integrally connected to the drive arm 19 of the planting body 4.

  Accordingly, the side-pressing wheel 64 is swung by a rocking arm 66 that is interlocked with the rotation of the pressure-reducing cam 70, and has a rocking motion that suppresses one side surface of the soil that has been brought up above the base portion of the seedling. To do. As a result, the soil collapses due to the side laying from the side of the reed, the soil can be increased, and the suppression effect is improved as compared with the prior art.

  Further, FIG. 13 shows another embodiment of the lateral pressure wheel 64. FIG. 13A shows an example in which a spherical pressure-reducing wheel 64 is used instead of the cylindrical roller-shaped pressure-reducing wheel 64 in FIG. 12, but in this case, deformation of the heel is reduced to prevent the tearing of the multi-film. There is an effect to.

  In addition, the example shown in FIG. 13B is an embodiment in which a pair of laterally-pressed pressure wheels 64a and 64b are provided so that both sides of the heel can be hit. The pair of side pressure suppressor wheels 64 a and 64 b are supported by pressure suppressor wheel support arms 65 a and 65 b that are rotatably attached to the rear end of the support frame 23. Gears 71a and 71b are fixed to the pair of pressure-reducing wheel support arms 65a and 65b, respectively, and the gears 71a and 71b are engaged with each other. Further, since one of the pressure-reducing wheel support arms 65a is rotated by the movement of the joint rod 68 that moves up and down by the swing arm 66 shown in FIG. 12, the rotation of the pressure-reducing wheel support arm 65a is the other pressure-reducing wheel support arm 65b. Are transmitted via gears 71a and 71b. Therefore, in conjunction with the movement of the pressure suppression cam 69 shown in FIG. 12, the pressure suppression wheel support arms 65a and 65b rotate in the direction of the arrow, and the pair of lateral pressure suppression wheels 64a and 64b move on the side surfaces on both sides of the bag. Can be crushed.

  The seedling transplanting machine shown in the figure is provided with a preliminary seedling placement frame 60 on which spare seedlings are placed on the upper part of the machine body. As shown in FIG. 14, the seedling basket 60 a is fixed to the first case portion 18 a via the support arm 63 so that the posture of the seedling taken out from the preliminary seedling placement frame 60 is forward inclined (front is downward, rear is upward). ing. The preliminary seedling placement frame 60 is arranged so that the seedling basket 60a is arranged so that the seedling taking-out port from the seedling basket 60a is just before the belt 26a and the height is almost equal.

  If the posture of the seedling and the seedling basket 60a are rearwardly inclined (front is upward, rearward is downward), the front wheel 7 is raised and turned when the transplanter turns, so that the machine body is inclined backward, and the seedling basket 60a becomes an operator. Since the direction of pulling out the seedling is downward, the seedling not only easily jumps out of the seedling basket 60a but also easily takes out another seedling.

  However, in the configuration shown in FIG. 14, the seedling basket 60a is fixed in a tilted state, so that not only the seedling basket 60a is prevented from falling during turning but also the direction in which the seedling is taken out is the direction in which the seedling basket 60a is pulled up. Even if other seedlings get caught, they can be easily removed, and the taking-out of seedlings can be reduced.

  In addition, guide rollers 61 and 61 that roll on the front side of the front wheels 7 and 7 in contact with both side portions of the kite are provided on the left and right of the front wheels 7, and the aircraft advances along the kite by the guide rollers 61 and 61. To come. The guide rollers 61 and 61 are attached to the front of the machine body so as to be rotatable around the horizontal axis. When the drive wheels 6 and 6 are raised, the guide rollers 61 and 61 are raised and the drive wheels 6 and 6 are lowered. Is provided with an interlocking mechanism 62 for lowering the guide rollers 61 and 61. As a result, when the machine body is entered in a state where the machine body is straddled from the edge of the cocoon, the drive wheels 6 and 6 are lowered to raise the machine body so that the lower end portion of the seedling transport unit 3 does not come into contact with the cocoon. Let it enter. At this time, since the guide rollers 61 and 61 are moved upward in conjunction with the lowering of the drive wheels 6 and 6, there is a situation in which the guide roller 61 comes into contact with the eaves as compared with the conventional technique in which the guide roller 61 is fixed up and down. It will be less likely to occur and it will be easier to maneuver the aircraft.

  In the seedling transplanting machine of the present embodiment having the above-described configuration, the machine body is self-propelled by the traveling device 1, and sweet potato seedlings are supplied from the operator to the seedling conveyance unit 3 of the self-propelled machine body. The seedling transport unit 3 transports the supplied seedlings, and the seedling planting body 4 plants the seedlings transported by the seedling transport unit 3 in the field. The seedling transport section 3 includes a plurality of seedling storage sections 26... In the seedling transport direction C, and the sweet potato seedlings are stored in the seedling storage sections 26. An operator supplies seedlings to a seedling storage unit 26... Which is transported in one direction left and right by the upper horizontal transport unit 3 a on the upper side of the machine body, and the seedling storage unit 26. Following the part 3a, the sheet is conveyed downward by the descending conveyance part 3b. The seedling container 26... Transported by the descending transport unit 3 b is lowered to a point P (the lowest position) where the seedling planting body 4 takes out the seedling, and the seedling planting body 4 takes out the seedling at that point. Plant seedlings in the field. After the seedling is taken out, the seedling container 26 is transported upward by the ascending transport unit 3c and returns to the transport start end side of the upper lateral transport unit 3a.

  The seedling planting action section 4a of the seedling planting body 4 takes out the vine seedling from the seedling picking point P of the seedling transporting section 3 while holding the base side portion and enters the soil, and in the soil, in the direction of the aircraft movement It moves in the direction along, and inserts the held seedling into the soil. After moving a set distance in the direction along the airframe traveling direction, the seedling planting action part 4a releases the seedling and rises to escape from the soil. In order to change the insertion length of the seedling, it is possible to change the speed at which the seedling planting body 4 moves in the soil in the direction along the aircraft traveling direction by switching the transmission section 80.

  The present invention can be applied to a seedling transplanter for planting vine seedlings such as sweet potato seedlings in a field.

The side view of the seedling transplanter of embodiment of this invention. The top view of the seedling transplanting machine of FIG. The expansion perspective view of the seedling planting body part of the seedling transplanting machine of FIG. The rear view of the seedling conveyance part of the seedling transplanting machine of FIG. The figure which shows the schematic drive system of the seedling conveyance part and seedling planting body of the seedling transplanting machine of FIG. The side view of the support arm part of the seedling planting body of the seedling transplanting machine of FIG. The expansion perspective view of the seedling planting body front-end | tip part of the seedling transplanting machine of FIG. Fig. 8 (a) is a bottom perspective view, Fig. 8 (b) is a top perspective view, Fig. 8 (c) is a plan view, and Fig. 8 (d) is a side view. Figure). The cross-sectional schematic of the drive system in the planting case of the seedling transplanter of FIG. The figure which shows the locus | trajectory of the front-end | tip of the seedling planting body of the seedling transplanting machine of FIG. The cross-sectional side view which shows a seedling planting state. The figure which shows the Example of a side knocking pressure wheel. The figure which shows the other Example of a laterally pressed pressure ring. The perspective view of a part of preliminary seedling mounting frame part and seedling conveyance part of the seedling transplanter of FIG.

Explanation of symbols

1 travel device 2 a steering wheel 2a grip portion 2b handle frame 3 seedling transport unit 3a the upper horizontal transport portion 3b lowered transport unit 3c rising conveyor section 3d lower horizontal conveyor 4 planting body 4a action portion 4a _1, 4a ₂ Kyojigu 4b support part 4b _1, 4b ₂ supporting arms 4c _1, 4c ₂ closing member 4d _1, 4d ₂ roller 4e spring 5 engine 6 rear wheel 7 wheel 8 transmission case 9 the transmission case 10, 17 the axle 11 the hydraulic cylinder 12a a piston rod arm 12 lifting DESCRIPTION OF SYMBOLS 13 Balance 14 Rod 15 Right-and-left horizontal control hydraulic cylinder 16 Front wheel support frame 18 Planting transmission case 18a First case part 18b Second case part 18c Third case part 19 Drive arm 20 Drive shaft 21 Support link part 22 Swing link 23 Support frame 24 Sensor 25 Support shaft 2 Seedling body 26a Wide endless belt 26b Partition member 26c Seedling holding part 26d Feed hole 29, 30, 31, 32 Rotating body 33 Rotating shaft 35 Intermittent drive device 36 Tension roller 38 Support plate 40 Cover soil pressure reducing wheel 41 Support member 42 Support device 43 Handle 44 Spring 45 Second pressure wheel 46 Second pressure wheel support member 47 Horizontal shaft 48 Arm 49 Cam body 50 Spring 51 Scraper 51a Inner scraper 51b Outer scraper 51b ₁ slit 60 Preliminary seedling frame 60a Seed basket 61 Guide roller 63 Support arm 64 Side pressure suppression wheel 65, 65a, 65b Pressure suppression wheel support arm 66, 66a, 66b Swing arm 68 Joint rod 69 Roller 70 Pressure suppression cam 71a, 71b Gear 80 Speed change transmission part 82 Eccentric gear 83 Circular gear 85 Input 86 output shaft 87 circular gear 89 sprockets 89a Chen 90 shift lever 91 shift pin 91a shift key 91b shifter 93 eccentric gear

Claims (2)

A plurality of seedling storage portions 26 for storing the vine seedlings one by one in a posture facing in the front-rear direction are provided, and the seedling storage portions 26 are rotated in a row around a rotation shaft 33 whose axis is directed in the front-rear direction of the machine body. A seedling provided with a seedling transport unit 3 for transporting seedlings and a pair of seedling planting bodies 4 for taking out the vine seedlings transported downward by the seedling transport unit 3 from the seedling transport unit 3 and planting them in the field In the transplanter,
The seedling planting body 4 includes support arms 4b ₁ and 4b ₂ that operate according to a preset planting locus, and seedling planting that sandwiches the vine seedlings at the tips of the support arms 4b ₁ and 4b ₂ . The support arms 4b ₁ , 4b ₂ are formed of sandwiching tools 4a ₁ , 4a _2, and the support arms 4b ₁ , 4b ₂ are formed with a seedling planting body in which the width L ₁ in the left-right direction is narrower than the width L _{2 in the} up-down direction in a cross-sectional view in the longitudinal direction. A seedling transplanter characterized by comprising. The seedling transplanter according to claim 1, wherein a cross section of the support arms 4a ₁ and 4a ₂ of the seedling planting body 4 with respect to the longitudinal direction is formed in an elliptical shape.

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