JP2000300021A - Loading seedling in transplanter and structure of seedling-loading part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To load seedlings in a transplanter by winding a formed mat seedlings formed as a specific length, as a rolled state in advance and then extending it on a seedling- loading surface as an almost planar state by rolling it from the upper side of the seedling-loading stand without requiring to install a rolled seedlings-delivering part at the seedling-loading stand. SOLUTION: This method for loading formed mat seedlings on a seedling-loading surface 11b of a seedling-loading stand 11, is provided by winding a formed mat seedlings formed as a long length in a range not greatly exceeding the length of the seedling-loading stand 11, as a rolled state in advance and then extending the rolled state formed mat seedling on a seedling-loading surface as an almost planar state by rolling the same from the upper side of the seedling-loading stand. Also, as a seedling-loading stand structure in the transplanter, it is possible to constitute a seedling-restraining body as capable of freely changing its posture as a seedling- restraining posture for closing to the seedling-loading surface and a retreating posture parting from the seedling-loading surface and also install a retreat-locking means for holding the seedling-restraining body in the retreating posture, on extending the rolled state formed mat seedlings on the seedling-loading surface as almost planar state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a method for placing seedlings and a structure for placing seedlings in a transplanter for transplanting long molded mat seedlings.

[0002]

2. Description of the Related Art In general, a seed mat seedling is formed by raising seedlings in a seedling raising box having approximately standardized dimensions (30 cm wide × 60 cm long), and then placed on a seedling table of a transplanter. Transplanted to the field, the standard size molded mat seedling,
Because several pieces are formed in a length that can be placed in series on the seedling mounting table, it is not permissible to increase the number of seedling transportation when replenishing seedlings,
There was an inconvenience that the frequency of scraping the seedlings at the joint was increased.

[0003]

Therefore, a long band-shaped seedling that greatly exceeds the length of the seedling mounting table is raised, and the band-shaped seedling is previously wound in a reverse winding state to form a roll seedling.
A system in which the roll seedling is set in a roll seedling feeding portion provided on a seedling mounting table and transplanted has already been proposed. Then, in the roll seedling transplanting system, when winding the band-shaped seedling, the band-shaped seedling is wound in a reverse winding shape so that the leaf stem is unfolded in a state of falling down in a direction opposite to the seedling feeding direction. However, in this case, it is necessary to forcibly wind down the leaf stem which is pushed by the wound band-shaped seedling and is to fall down in the winding end direction while forcibly rolling down in the winding start end direction. It is not necessary to take time, there is a possibility that the leaf stem portion may be damaged and the growth after transplantation may be adversely affected, and furthermore, it is necessary to provide the roll seedling feeding portion on the seedling mounting table, so that the seedling mounting portion structure However, there was an inconvenience of becoming complicated.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems in view of the above-mentioned circumstances, and is provided on a seedling mounting surface of a seedling mounting table provided in a transplanter. Upon placing the molded mat seedling, the molded mat seedling formed in a long length in a range not to greatly exceed the length of the seedling mounting table is wound in a roll shape in advance, and then the rolled molded mat seedling is placed on the seedling mounting. It is characterized in that it is rolled from the upper side of the table and developed in a substantially planar shape on the seedling mounting surface. In other words, even though a long molded mat seedling is wound up in a roll, the molded mat seedling is unfolded and placed on a substantially flat surface without being placed on a seedling mounting table in a rolled state. There is no need to provide a roll seedling feeding section on the platform. In addition, even if the molded mat seedling is rolled forward (rolling) so that the leaf stems fall down comfortably, the leaf stems are countered if they are rolled from the upper side of the seedling mounting table and deployed on the seedling mounting surface. Since the seedlings do not fall down in the feeding direction and do not interfere with the trajectory of the transplanting claw, the winding operation of the seedlings can be simplified as compared with the roll seedling transplanting system in which the seedlings are reversely wound. It is also possible to avoid the disadvantage of damaging the growth after transplantation. In addition, a seedling mounting table that guides the molded mat seedlings downward along the seedling mounting surface, a seedling holding body that regulates the floating of the molded mat seedlings at a position facing the seedling mounting surface, and a molding at the lower end of the seedling mounting table. In a transplanter equipped with a transplanting nail for scraping an appropriate number of seedlings from the mat seedlings and transplanting the seedlings to a field, the molded mat seedlings formed in a long length in a range not to greatly exceed the length of the seedling mounting table are previously rolled While winding, the roll-shaped molded mat seedling is rolled from the upper side of the seedling mounting table and unfolded in a substantially planar shape on the seedling mounting surface. And a retractable locking means for holding the seedling presser body in the retracted posture, and having a retractable posture separated from the seedling mounting surface. That is, since the roll-shaped molded mat seedling can be rolled from the upper part of the seedling mounting table while the seedling holding body is held in the evacuation position, there is no inconvenience between the molded mat seedling and the seedling holding body when replenishing the seedlings. Instead, workability and work efficiency can be improved as compared with the case where the seed presser is retracted and held by hand. Further, the amount of retreat of the seedling presser body with respect to the seedling mounting surface is increased on the upper side of the seedling mounting table and reduced on the lower side. In other words, since the retracted amount of the seedling holding body is set in consideration of the change in the roll diameter when the roll-shaped molded mat seedling is rolled from the upper part of the seedling mounting table, interference with the seedling is avoided with the minimum retracted amount. As a result, it is possible to avoid problems such as an increase in the size of the seedling mounting portion and a complicated structure, such as a case where the seedling presser body is retracted more than necessary. Further, a seedling mounting table for guiding the molded mat seedlings downward along the seedling mounting surface, and a transplanting nail for scraping an appropriate number of seedlings from the molded mat seedlings at the lower end of the seedling mounting table and transplanting them to the field. In the transplanting machine provided, when placing the molded mat seedling formed in a long shape in a range that does not greatly exceed the length of the seedling mounting table on the seedling mounting surface in a substantially flat shape, the upper end of the molded mat seedling is placed on the seedling mounting table. A folded holding means for holding the side in a folded shape is provided. In other words, when the upper end side of the molded mat seedling protrudes from the seedling mounting surface, the protruding part can be held in a folded shape. The seedlings of the mat seedlings can be spliced. As a result, it is possible to avoid an increase in the size of the seedling mounting table while placing the long molded mat seedlings in a substantially planar shape.

[0005]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a molded mat seedling to be placed on a seedling table 11 of a riding rice transplanter (transplanter) 2 and transplanted, and the molded mat seedling 1 is placed in a nursery box (not shown) of a predetermined size. The seed mat material 1a is laid, a predetermined amount of seeds are sown there, and the seedlings are raised for a predetermined period of time. The molded mat seedling 1 of the present invention has a length substantially equal to that of the seedling table 11 ( Up to a standard length (30 cm wide x 6 long), up to and including a little longer and shorter than the seedling mounting table length
It may be formed 1.5 times or 2 times as large as a molded mat seedling of 0 cm), and in the present embodiment, it is formed to be 150 cm long (about 2.5 times the standard). That is, in order to reduce the number of times of seedling transport during seedling replenishment and to reduce the number of seams of the seedlings, when forming the molded mat seedlings 1 into a long length, the length of the seedling mounting table 11 was set to be long without significantly exceeding the length. As a result, it is not necessary to provide a roll seedling feeding portion on the seedling mounting base 11 as in a roll seedling transplanting system in which the seedlings are mounted on the seedling mounting base in a rolled state. Become a seedling platform 11
It is possible to avoid an increase in the size and complexity of the structure.

[0006] As the nursery material 1a, an artificial mat obtained by molding crushed rice hulls with a general-purpose binding material is used. Therefore, the tensile strength and bending strength of the molded mat seedling 1 are determined according to the mixing amount of the binding material. , Shear strength and the like can be arbitrarily adjusted. In other words, while the molded mat seedling 1 is a long one, the required tensile strength can be secured, so that there is no inconvenience such as a gap at the seam due to deformation, and the appropriate bending strength and shear strength By securing the molded seedlings 1
Can be handled in a roll state having excellent transportability, and good scraping can be performed.

Further, the molded mat seedling 1 is wound up in advance into a roll shape, and when the rolled molded mat seedling 1 is placed on the seedling mounting table 11 in a substantially planar manner and transplanted, the molded mat seedling 1 is removed. A roll seedling transplantation system in which the seedlings are reverse-wound so that the leaf stems fall down to the winding start end side, so that the leaf stems fall down to the winding start end side so that the leaf stems fall down comfortably. In comparison with the method described above, the winding operation of the seedling can be simplified, and the inconvenience of damaging the leaf stem and adversely affecting the growth after transplantation can be avoided.

[0008] On the other hand, 3 is a traveling machine body 4 of the riding rice transplanter 2.
A holder frame 6 removably connected to the elevating link mechanism 5, and a rotatably connected to the holder frame 6. Planting section frame 7, a drive case (not shown) integrally assembled with the planting section frame 7, a plurality of planter cases 9 projecting rearward from the drive case, An apron 10 arranged in the direction, the above-mentioned seedling mounting table 11 which is movable left and right along the apron 10, a transplanting nail 12 for scraping a seedling from a lower end portion of the seedling mounting table 11 and planting it on a rice field; A float 13 and the like that slide on the rice field are provided.

The seedling mounting table 11 is disposed on the planting section 3 in a front-to-back and rear-to-bottom inclined posture, and has a rear surface partitioned by a plurality of guide ribs (convex portions) 11a pointing in the vertical direction. The seedling mounting surface 11b is formed for the number of the planted streaks (for example, for five streaks). That is, the molded mat seedling 1 placed on each seedling mounting surface 11b is supplied and guided toward the lower transplanting nail 12 while restricting lateral displacement by the left and right guide ribs 11a. It is configured to reciprocate in the left-right direction in accordance with the operation of a seedling table horizontal feed mechanism (not shown) incorporated in the cradle.

Reference numeral 14 denotes a rotary case which is assembled to the rear end of the planter case 9. The rotary case 14 has a pair of transplanting claws 12 at both ends and a pair of transplanting claws 12 with its own rotation. A planetary gear mechanism (not shown) for rotating the claw 12 along a predetermined locus is provided. That is, the transplanting nail 12 enters the scraping opening formed in the apron 10 by a predetermined size to scrape an appropriate number of seedlings from the lower end portion of the molded mat seedling 1, and enters the paddy surface to scrape. It rotates in a circular manner between the planting process that releases the seedlings.

Reference numeral 15 denotes a vertical feeding mechanism provided along each seedling mounting surface 11b of the seedling mounting table 11.
In 5, a vertical feed belt 18 composed of a wide belt with projections is suspended between a lower drive roller 16 and an upper driven roller 17, and a drive roller shaft 16a is connected to a ratchet mechanism (not shown). And is interlocked with a vertical feed lever (not shown). That is, when the seedling mounting table 11 reaches the horizontal feed end, the vertical feed drive cam (not shown) provided on the drive case side is configured to hit the vertical feed lever, and the vertical feed lever is knocked up. In this case, as the drive roller 16 interlockingly connected via the ratchet mechanism rotates by a predetermined amount, the tension side (the seedling contact side) of the vertical feed belt 18 moves down by a predetermined feed amount and the molding is performed. The mat seedling 1 is forcibly fed vertically toward the apron 10.

Numeral 19 denotes a seedling holding body which is arranged side by side opposite to the seedling placing side of the seedling placing stand 11. The seedling holding body 19 floats the molded mat seedling 1 at the lower end side of the seedling placing stand 11. The lower seedling presser 20 for regulating the seedling, the intermediate seedling presser 21 for regulating the floating of the molded mat seedling 1 in the middle part of the seedling platform 11, and the rising of the molded mat seedling 1 at the upper end side of the seedling platform 11. The seedling presser stay 22 is attached to a seedling presser stay 23, and the lower end of the seedling presser stay 23 is attached to a seedling presser bracket 24 erected on the lower end of the seedling mounting table 11. While being supported swingably back and forth through 23b, a grip portion 23a for retracting and swinging the seedling presser body 19 from the machine side is formed at the upper end of the seedling presser stay 23. Stay 2
An evacuation lock release lever 26 is provided at an intermediate portion of 3 so as to be able to swing back and forth with the support shaft 25 as a fulcrum, and an upper end extending to the vicinity of the grip portion 23a.

Reference numeral 27 denotes an evacuation lock plate which is provided upright at an intermediate portion of the seedling mounting table 11. The evacuation lock plate 27 has a lock pin 26a provided at a base end of the evacuation lock release lever 26. A plurality of engagement grooves 27a engageable from above are formed. That is, the seedling presser body 1
When the rocking operation is performed to retract 9 from the seedling mounting surface 11b of the seedling mounting table 11, the lock pin 26a automatically engages with the engaging groove 27a with the swing of the retract lock release lever 26 by its own weight. And a seedling presser body 1 based on the engagement action.
9 is held in the evacuation position, while the evacuation lock release lever 2
When the swinging operation of the backing 6 is performed, the lock pin 26a is disengaged from the engaging groove 27a, and the returning swing of the seedling presser body 19 to the seedling holding posture is allowed.

Among the seedling pressers 20, 21 and 22, the lower seed presser 20 and the intermediate seed presser 21 are formed by bending a wire. It is configured using a roller member rotatably supported by a support shaft 28. That is, the upper seedling presser 22
Controls the floating while rolling on the molded mat seedling 1, but the molded mat seedling 1 placed on the seedling mounting table 11
When feeding out from the upper end of b, the protruding portion can be wound around the upper seedling presser 22 and held in a folded state, and the folded portion can be smoothly fed out with the rolling of the upper seedling presser 22. Is available. A plurality of grooves 22a are formed on the outer peripheral surface of the upper seedling presser 22 at predetermined intervals in the left-right direction. The grooves 22a are used to avoid pushing down the leaf stem as much as possible. Has become.

Reference numeral 29 denotes a pair of right and left seedling holding brackets for supporting both ends of the roller support shaft 28. A plurality of reinforcing stays 30 are provided between the seedling holding brackets 29 at predetermined intervals in the vertical direction. In addition, the reinforcing stay 30 is provided with a plurality of elongated plates 31 whose upper ends are inserted into the grooves 22a of the upper seed presser 22 at predetermined intervals in the left-right direction. That is, the reinforcing stay 30 and the plate 31 function as a drooping regulating member that regulates the upper end side of the molded mat seedling 1 folded along the outer periphery of the upper seedling presser 22 from drooping toward the seedling mounting surface 11b. The plate 31 is also used as a mounting member for the intermediate seedling presser 21.

Further, reference numerals 31 and 32 denote seedling feed mechanisms provided in the seedling holding body 19, and the seedling feed mechanisms 31, 3
2, the upper seedling feed mechanism 31 has a first swing arm in which an arm base end is supported at an intermediate portion of the seedling holding stay 23 so as to be able to swing back and forth via a first arm support shaft (support shaft 25). 33,
A second swing arm 34 in which an arm intermediate portion is supported at the distal end of the first swing arm 33 via a second arm support shaft 34a so as to be able to swing back and forth, at both ends of the second swing arm 34 A pair of upper and lower seedling discs 35, 36 supported rotatably in the seedling feeding direction via seedling feed spindles 35a, 36a, and pulleys 35 integrally provided on the seedling feeding discs 35, 36, respectively.
b, 36b, a drive belt 37 suspended between the pulleys 35b, 36b, an ammunition 38 for urging the first swing arm 33 toward the seedling mounting surface, and the like. The seedling feed disks 35 and 36 having biting teeth on the outer peripheral portion are provided with an elastic machine 38.
With the urging force of the above, the floating and the lateral displacement of the seedlings are regulated by biting against the molded mat seedlings 1, but the lower seedling feeding disk 36 is
Since the vertical feed belt 18 is disposed at the upper facing position, the vertical feed belt 18 is positively rotated while preventing slippage, and the upper seedling feed disk 35 is rotated synchronously via the drive belt 37. It has become. In other words, it is possible to forcibly feed the molded mat seedling 1 vertically even in a portion where the vertical feed belt 18 is not provided (the position where the upper seedling feed disk 36 is disposed). It becomes possible to perform good seedling feeding by distributing the feeding load.

On the other hand, the lower seedling feed mechanism 32 has a swing arm 39 supported at the lower end of the seedling holding stay 23 via an arm support shaft 39a so as to be able to swing back and forth. It is composed of a seedling feeding disk 40 rotatably supported via a supporting shaft 40a in a seedling feeding direction, a spring 41 for urging the swing arm 39 toward the seedling mounting surface, and the like. The seedling feeding disk 40 having biting teeth on the outer periphery thereof bites into the molded mat seedling 1 by the urging force of the ramming machine 41 to regulate the floating and lateral displacement of the seedling. Since the longitudinal feed belt 18 is disposed at a position facing the lower part of the belt 18, the longitudinal feed belt 18 rotates positively while preventing slippage.
Reference numeral 42 denotes a forced evacuation bar integrally projecting from the swing arm 39. The forced evacuation bar 42 is
The left and right evacuation lock plates 27 are
With the stopper stay 43 protruding from the
Since the swing arm 39 is forcibly swung rearward, the lower seedling feed mechanism 32 can be retracted more than the retreat amount of the lower end side of the seedling presser stay 23, and the lower end of the lower seedling presser 20 can be retracted. The lower side is engaged with the tip of the swing arm 39, so that the lower seed presser 20 can be largely retracted from the seedling mounting surface 11b in conjunction with the forced swing of the swing arm 39. ing.

Next, a method of mounting the molded mat seedling 1 on the seedling mounting table 11 will be described. However, as the molded mat seedling 1, a roll-shaped one that has been previously wound in a normal winding shape is prepared as described above, and a spare seedling to be replenished when the seedling runs out is formed at the upper end of the seedling mounting table 11. Spare seedling storage unit 44
Shall be housed in

At the beginning of the work, the seedling holding body 19
The seedling mounting surface 1 of each line is retracted from the seedling mounting surface 11b.
1b, one piece of the molded mat seedlings 1 is placed in a plane, and after that, the transplanting operation is started by returning the seedling holding body 19 to the seedling holding posture. When placed on a plane 11 in the present invention,
The roll-shaped molded mat seedling 1 is rolled from the upper end side of the seedling mounting table 11 and spreads flat on the seedling mounting surface 11b. That is, even if the leaf stem is wound up in a normal winding shape so that it falls down comfortably, the seedling mounting surface 11
When the leaf stem is deployed in b, the leaf stem falls down in the anti-seedling feeding direction, so that it is possible to avoid the inconvenience that the leaf stem interferes with the trajectory of the transplanted nail at the seedling scraping position.

When the molded mat seedling 1 is mounted on the seedling mounting surface 11b as described above, the seedling presser body 19 retreated from the seedling mounting surface 11b is retracted by the retracting lock release lever 26 and the retracting lock plate 27. Since the molded mat seedling 1 rolled from the upper side does not have the inconvenience of interfering with the seedling holding body 19 because it can be held in the posture,
The workability and work efficiency can be improved as compared with the case where 9 is retracted and held by hand.

The seedling presser body 19 held in the evacuation position is also provided.
The retreat amount is set so as to be large on the upper side of the seedling table 11 and smaller on the lower side in consideration of the roll diameter change when the roll-shaped molded mat seedling 1 is rolled from the upper part of the seedling table 11. Therefore, interference with the molded mat seedling 1 can be avoided with a minimum amount of retreat. In other words, since a good retreat operation can be performed with a simple configuration that swingably supports the lower end portion of the seedling presser 19, it is possible to retreat the seedling presser 19 more than necessary, It is possible to avoid the inconvenience of increasing the size of the planting section 3 and complicating the structure.

When replenishing seedlings, the roll-shaped molded mat seedlings 1 (preliminary seedlings) are taken out of the spare seedling storage section 44 and the roll-shaped molded mat seedlings 1 are placed on the seedling mounting table as described above. Rolled from the upper side of 11 and expanded in a plane, and this is added to the remaining seedlings. At this time, if the replenished molded mat seedling 1 is to be eaten from the upper end of the seedling mounting surface 11b, the feeding portion is set to the upper side. It can be folded back along the outer periphery of the seedling presser 22, and the folded portion is smoothly fed out sequentially as the upper seedling presser 22 rolls. That is,
Since the long molded mat seedlings 1 can be spliced when the seedlings are replenished without extending the seedling mounting base 11, the long molded mats 1 are placed on the seedling mounting plane in a planar manner. However, the size of the seedling mounting table 11 can be prevented from increasing.

When the molded mat seedling 1 is mounted on the seedling mounting surface 11b of the seedling mounting base 11 in the structure described above, the molding mat seedling 1 is formed to be long as long as it does not greatly exceed the length of the seedling mounting base 11. The molded mat seedling 1 is wound in a roll shape in advance,
Thereafter, the rolled molded mat seedling 1 is rolled from the upper side of the seedling mounting base 11 and is spread on the seedling mounting surface 11b in a substantially planar shape.
As in the case where the seedlings are placed on the seedling mounting table 11, there is no need to provide a roll seedling feeding part, and there is no occurrence of trouble due to poor feeding. In addition, even if the molded mat seedling 1 is rolled forward so that the leaf stems fall down comfortably, if the rolls are rolled from the upper side of the seedling mounting base 11 and deployed on the seedling mounting surface 11b, the leaf stems are counter-seeded. It is not allowed to be able to simplify the winding operation of the seedling compared to the roll seedling transplanting system in which the seedling is reverse-wound because it falls down in the feeding direction and does not interfere with the transplanting nail movement trajectory,
The inconvenience of damaging the leaf stem and affecting the growth after transplantation can also be avoided.

Further, when the roll-shaped molded mat seedling 1 is rolled from the upper side of the seedling mounting table 11 and unfolded in a substantially planar shape on the seedling mounting surface 11b, the molded mat seedling 1 is placed at a position opposed to the seedling mounting surface 11b. Place the seedling holding body 19 that regulates the floating on the seedling mounting surface 1
1b and a retracting posture separated from the seedling mounting surface 11b.
Since the evacuation lock mechanism (the evacuation lock release lever 26, the evacuation lock plate 27, etc.) for maintaining the evacuation posture of the seedling 9 is provided, the roll-shaped molded mat seedling 1 is placed with the seedling holding body 19 held in the evacuation posture. It can be rolled from the upper part of the stand 11, and as a result, there is no inconvenience that the molded mat seedling 1 interferes with the seedling holding body 19 when the seedlings are replenished.
The workability and work efficiency can be improved as compared with the case where 9 is retracted and held by hand.

Also, the seedling holding body 19 with respect to the seedling mounting surface 11b.
The amount of retreat is larger on the upper side of the seedling table 11 and smaller on the lower side, so that the minimum evacuation amount adapted to the change in the roll diameter when the roll-shaped molded mat seedling 1 is rolled from the upper part of the seedling table 11 Can be set, and as a result, the seedling presser body 19 can be set.
It is possible to avoid inconvenience that the planting section 3 becomes large and the structure becomes complicated, as in the case of retreating more than necessary.

Further, when placing the elongated molded mat seedling 1 on the seedling mounting surface 11b in a substantially planar shape, the upper end of the molded mat seedling 1 is folded back along the outer periphery of the upper seedling holder 22. This allows the seedlings to be satisfactorily rearranged without extending the seedling mounting table 11, and as a result, the long molded mat seedlings 1 are placed in a substantially planar shape. However, it is possible to avoid an increase in the size of the seedling mounting table 11.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of the seedling mounting table.

FIG. 4 is a partial plan view of the same.

FIG. 5 is a side view of the seedling mounting table showing a state where a molded mat seedling is placed.

FIG. 6 is a schematic side view of a seedling mounting table showing the seedling mounting method of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 molded mat seedling 2 riding rice transplanter 3 planting section 4 traveling machine 11 seedling mounting base 11b seedling mounting surface 12 transplanting claw 15 vertical feed mechanism 19 seedling holder 22 upper seedling holder 44 spare seedling holder

Claims (4)

[Claims] When placing a molded mat seedling on a seedling mounting surface of a seedling mounting table provided in a transplanter, a molded mat seedling formed in a length that does not greatly exceed the length of the seedling mounting table is rolled in advance. A method for placing seedlings in a transplanting machine, wherein the seedlings are wound into a shape, and thereafter, the roll-shaped molded mat seedlings are rolled from the upper side of the seedling placing table and spread in a substantially planar shape on the seedling placing surface. 2. A seedling mounting table for guiding a molded mat seedling downward along a seedling mounting surface, a seedling presser body for restricting floating of the molded mat seedling at a position facing the seedling mounting surface, and a lower end of the seedling mounting table. In a transplanting machine equipped with a transplanting nail for scraping an appropriate number of seedlings from the molded mat seedlings and transplanting them to the field, the molded mat seedlings formed in a length that does not greatly exceed the length of the seedling mounting table are prepared in advance. When the roll-shaped molded mat seedling is rolled from the upper side of the seedling mounting table and unrolled in a substantially planar shape on the seedling mounting surface while being wound into a roll, the seedling holding body is moved to the seedling close to the seedling mounting surface. A seedling placing part structure in a transplanting machine, which is configured to be freely changeable between a holding posture and a retracting posture separated from a seedling mounting surface, and provided with a retracting lock means for holding the seedling retaining body in the retracting posture. 3. The seedling placing part structure in a transplanting machine according to claim 2, wherein the retreat amount of the seedling holding body with respect to the seedling placing surface is increased above the seedling placing stand and reduced below the seedling placing stand. 4. A seedling mounting table for guiding a molded mat seedling downward along a seedling mounting surface, and transplanting for scraping an appropriate number of seedlings from the molded mat seedling at the lower end of the seedling mounting table and transplanting the seedlings to a field. In a transplanter equipped with nails, when placing a molded mat seedling that is long and formed in a range that does not greatly exceed the length of the seedling mounting table on the seedling mounting surface in a substantially planar shape, a molding mat is provided on the seedling mounting table. A seedling mounting structure in a transplanter, comprising a folded holding means for holding the upper end of the seedling in a folded shape.