JP2509846Y2 - Seedling removal mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the structure of a seedling take-out mechanism in a transplanter or the like for vegetable seedlings.

[Problems to be solved by conventional techniques and devices]

The applicant of the present application, in Japanese Utility Model Application No. 1-107454, previously provided a transplanting mechanism for transplanting seedlings on the upper surface of the ridge at the lower part of the traveling machine body as a configuration of a transplanting machine for vegetable seedlings, and at the upper part of the traveling machine body, It was proposed to provide a seedling take-out mechanism with a pair of claws that vertically and vertically swing toward the upper surface of the seedling storage box in the placing part.

In the seedling take-out mechanism in this configuration, the plug seedlings are picked at the lower ends of the pair of claws near the lower limit of the stroke, the claws rise in that state, and the lower ends of the pair of claws near the upper limit of the upward stroke. There is an interval so that the plug seedlings are separated.

However, due to the adhesive force of soil or the like in the plug seedling, a situation occurs where the plug seedling cannot be separated from the open nail body, a missing part of the seedling is made, or the next plug seedling picking operation is impaired, or There was the problem of disabling.

The present invention aims to solve these problems.

[Means for solving the problem]

In order to achieve this object, the present invention has a pair of claws vertically oscillating with respect to a plug seedling portion in a seedling take-out portion provided on a traveling machine body, and at a tip end of the pair of claws in a descending stroke. The plug seedling is picked and taken out, and in the seedling taking-out mechanism configured to release the plug seedling with a gap between the tip end portions of the pair of nail bodies in the vicinity of the end of the ascending stroke, in at least one of the pair of nail bodies. , A push-out tube body that is movable along its longitudinal direction is loosely fitted, and the push-out tube body is retracted toward the base end direction of the claw bodies when the claw bodies descend, so that the distance between the tip ends of the claw bodies is reduced. When opened, the push-out tube body is configured to advance so that its tip approaches the tip end direction of the claw body.

[Function and effect of device]

According to this configuration, the pair of claws in the seedling take-out mechanism descends, picks up the plug seedlings in the seedling take-out part at its tip, and the pair of claws rises in that state, near the end of the ascending stroke. The pair of claws are opened at intervals between the tips to release the plug seedlings.

In this way, at least one of the pair of claws that reciprocate vertically swings, and the tube body is movably fitted so as to be pressed,
This extruded tube retreats to the proximal end side of both claws when both claws descend, so when picking plug seedlings at the tip of both claws, it is possible to keep the extruded tube at that location. , Extruded tube does not get in the way.

On the other hand, when the pair of claws are lifted to open the space between the tips of the claws, the tip of the pushing tube body moves forward toward the tips of the claws. Even if the plug seedling is attached to the tip of the plug, the tip of the extruded tube enters so as to separate the attachment part between the plug seedling and the nail body and pushes out the plug seedling, so that the plug seedling is separated from the nail body. That is, it is possible to surely carry out the above, and it is possible to surely prevent an accident that a stock stapling occurs during seedling planting work.

Moreover, since the extruded tube is always loosely fitted in the claw,
The plugged seedlings are less likely to come into contact with the seedlings, and the damage to the seedlings can be avoided, which is a remarkable effect.

〔Example〕

Next, a description will be given of an example applied to a plant for transplanting vegetable seedlings. In the figure, the transplanter 1 has a rectangular frame-shaped traveling machine body 2 having an engine 3 mounted in the front part and having a longitudinal length in plan view, and a furrow 8b.
A pair of left and right front wheels 4, 4 and rear wheels 5, 5 traveling on the road, a handle 6 protruding rearward from the traveling machine body 2, and a traveling machine body 2
One compression wheel 7 that protrudes downward from the ridge 8 and presses the upper surface of the ridge 8, a multi-cutter 10 that punches a hole 11 at a seedling transplant site in a synthetic resin multi-film 9 that covers the ridge 8, and a transplant device 12. , A pair of left and right soil-covering wheels 13, 13 which are mounted on the rear portion of the traveling machine body 2 in a height-adjustable manner.

The transplanting device 12 includes a transport mechanism 14 for transferring the synthetic resin seedling storage box A toward the rear portion of the transplanter 1, and a seedling storage box A.
A seedling taking-out mechanism 15 for taking out the plug seedlings P of vegetables such as lettuce from the pot portions a arranged side by side at right and left and front and back, and the taken-out plug seedlings P toward the lower transplanting mechanism 16. The transplanting mechanism 16 comprises a guide transporting mechanism 17 for transporting, and in the transplanting mechanism 16, the plug seedlings P are provided at the ridges 8 at the 11 locations.
It is to be transplanted to the upper surface (ridge).

Further, the pushing member 18 in the left-right halved semi-conical cylinder shape in the transplantation mechanism 16 and the multi-cutter 10 are configured to rotate up and down in synchronization.

A front wheel 4 is attached to the rear of each of a pair of left and right hollow swing arms 21, 21 pivotally supported on both left and right sides of a drive axle 20 attached to the lower part of the traveling machine body 2, and the front wheel 4 is attached to the engine 3. Power is transmitted to the drive axle 20 via the mission case 22, and the front wheels 4 are driven via the chains in each swing arm 21.

The pair of left and right rear wheels 5, 5 are attached to the rear portions of the rod-shaped swing arms 25, 25, respectively, and the bases (front portions) of the left and right swing arms 25, 25 are projected downward from the left and right sides of the traveling body 2. Horizontal shafts 24, 24 projecting from the support frames 23, 23 are rotatably supported.

Reference numeral 26 is a vertical interlocking mechanism capable of adjusting the height of the front and rear four wheels 4 and 5 with respect to the traveling body 2 all at once, and a connecting rod pivotally attached to the left and right front and rear swing arms 21, 25 respectively. 27, a connecting rod 27 pivotally attached to the right and left front and rear swing arms 21, 25, respectively, and a spring housing frame 28 mounted on the traveling machine body 2 so that its position can be adjusted in the front-rear direction. A swing shaft 29 rotatably provided, and swing arms on both the left and right sides of the swing shaft 29 and the left and right sides.
21, 21 and a link mechanism 30 connected to each other, and a spring (not shown) force provided on the spring housing frame 28 to press the swing shaft 29 rearward is balanced with the support reaction force by the compression wheel 7. Then, the front and rear wheels 4 and 5 are configured to be biased downward.

When the swing shaft 29 moves in the front-back direction, the front and rear swing arms swing up and down all at once, and the traveling machine body 1 moves up and down in a substantially horizontal state. The swing shaft 29 rotates about its axis. In this case, when the right (left) swing arm descends, the left (right) swing arm rises, and the traveling machine body 1 rolls left and right.

Then, a rotation handle that rotates from the rear portion of the traveling body 2
The front and rear positions of the spring accommodating frame body 28 are adjusted by an adjusting means including 31 and a screw shaft, and the position is maintained.

Although not shown, the rolling lock device is normally configured to prohibit the rotation of the swing shaft 29 about its axis and allow the rotation steplessly if desired.

The seed box accommodating box A having a rectangular shape in plan view has a pot portion a with an upper surface opening.
Are formed vertically and horizontally at regular intervals, and plug pots P of soiled vegetables are inserted in each pot portion a.

As shown in FIGS. 1 and 3, the transport mechanism 14 for the seedling storage box A is wound around a pair of front and rear pulleys 35, 36 between a pair of left and right vertical frames 33, 33 standing upright from the traveling machine body 2. The seedling storage box A is placed on the upper surface of the hung flat belt 34 and conveyed to the rear of the traveling machine body, and the drive pulley 35 at the rear position is driven via the electric motor 37 and the speed change mechanism 38.

A pair of left and right V pulleys 39, 39 attached to the left and right sides of the drive pulley 35 and rotating integrally with the drive pulley 35 hold and guide the left and right sides of the pot parts a, a at both left and right ends of the seedling storage box A. Then, the plug seedling P is pulled out by the seedling take-out mechanism 15 at the upper surface of the drive pulley 35, and the empty pot part a is forcibly guided so as to go around the lower surface of the drive pulley 35.

For details of the transplantation mechanism 16 provided on the rear lower surface of the traveling body 2,
Shown in FIGS. 4 to 6.

Reference numeral 40 is a transmission case for transmitting power from the transmission case 22 at the front of the traveling machine body through a bendable shaft or a transmission shaft 41 with a universal joint, and in the transmission case 40, the multi-cutter 10 and the transplantation mechanism 16 are provided. A first transmission section 42 for transmitting power is provided.

In the first transmission portion 42, a worm gear 44 that meshes with a worm 43 connected to the transmission shaft 41 is loosely fitted to the main shaft 45, and the worm gear 44 is tightened around the outer periphery of the one side boss portion 44a in the rotation direction of the main shaft 45. One end 46b of the twisted torsion spring 46 is attached to the spindle 45.
Side of the main shaft 45, and the other end 46a of the torsion spring 46 is left outside in the radial direction of the outer circumference of the main shaft 45, and the worm gear 44 and the main shaft 45 can be integrally rotated by the tightening force of the torsion spring 46. An actuator for releasing the winding tightening force of the torsion spring 46, which is the clutch 47, is provided while constituting the 47.

That is, an electromagnetic solenoid 48, which is an actuator for the clutch 47, is provided outside the transmission case 40, and the tip of a clutch pin 50 configured to move up and down by being connected to the tip of a link 49 of the clutch 47 is connected to the torsion spring 46. The other end 46a of the torsion spring 46 so that the clutch pin 50 faces the side surface of the other end 46a.
When abutting on the side surface, the tightening force of the torsion spring 46 on the worm gear boss portion 44a is released.

Power is transmitted to a bendable flexible shaft or a transmission shaft with a universal joint 53 via a bevel gear 52 that meshes with a bevel gear 51 attached to the main shaft 45, and a power is transmitted to a second transmission portion 96 for a seedling take-out mechanism 15 described later. introduce.

Power is transmitted from the main shaft 45 to the pawl shaft 54 via a pair of chain sprockets 55, 56 and a chain 57, and a graft rod 60 is pivotally attached to crank arms 58, 59 attached to one ends of the main shaft 45 and the pawl shaft 54, respectively. And swinging up and down to attach the rollers 62, 62 to the pair of swinging arms 61, 61 whose upper ends are pivotally supported by the transplanting rod 60, and the end face cam 64 of the pin 63 for attaching to the one crank arm 59.
Abutting on both left and right end faces of the
A pair of lower constricted semi-conical cylinders attached to the lower end rollers 62, 62 of the pair of swing arms 61, 61 in synchronization with the width between the left and right end faces of the crank arm and the rotation of the crank arms 58, 59. The lower ends of the push-in bodies 18, 18 are rotated so that the push-in bodies 18 are closed at the raised position and opened at the lowered position.

Reference numeral 65 is a compulsory body that descends when the pair of left and right pushing bodies 18, 18 descend and transplant the plug seedling P inside it into the upper surface of the ridge 8. It pushes the top surface of the soil downward and pushes it into the soil (see Fig. 4).

Reference numeral 66 is a branch portion for transmitting rotational power from the pawl shaft 54 to the multi-cutter 10 via a gear pair and a worm,
The tip of the flexible shaft 67 is the rotary shaft of the multi-cutter 10.
A bracket 69, which is connected to the rotary shaft 68 and supports the rotary shaft 68, is fixed to the pair of support shafts 70, 70 projecting forward from the transplant rod 60 so that the front and rear positions can be adjusted, and the multi-film 9 is attached to the lower end of the rotary shaft 68. A cutter blade 71 for cutting out a circular shape in plan view and a piercing bar 72 for piercing and holding the cut out circular film are provided. Reference numeral 73 is a substantially cylindrical pressing body that presses the multi-film 9 on the outer periphery from the hole to prevent wrinkles during the cutting operation (see FIG. 4).

Reference numeral 74 denotes a transmission case for the guide and transport mechanism 17 which is attached to the rear end of the tubular member 75 which projects rearward from the transmission case 40, and which extends from the shaft of the worm 43 in the transmission case 40 to the transmission case 74.
The pair of drive pulleys 77, 77 are driven via the pair of gears 76, 76 so that the facing sides thereof rotate downward, and the pair of drive pulleys 77, 77 and the driven pulleys 78, 77 in the upper position are driven. 7
The pair of left and right belts 79, 79 wound between the belt 8 and the belt 8 (arranged in a reverse C-shape when viewed from the rear so that the distance becomes narrower downward) and the pair of pushers 18 at the raised position , 1
Configure to lead within 8.

The seedling take-out mechanism 15 for taking out the plug seedlings P from the pot portion a of the seedling storage box A in the transport mechanism 14 includes a horizontally long guide shaft 80 mounted between the pair of left and right vertical frames 33, 33, and
A swinging shaft 81 having a rectangular cross section arranged in parallel with this, and a laterally moving body 84 which is fitted on a guide shaft 80 and engages a pin 83 with a reciprocating guide groove 82 formed on the peripheral surface of the guide shaft 80 to move. A main body 85 that sandwiches one end of the lateral moving body 84 from both the left and right sides and is loosely fitted to the swing shaft 81; and a pair of left and right swing rods 86 that project rearward from the main body 85 and are rotatable around the axis. , 86, and the main body 85 and the swing shaft 81 are attached via a one-way clutch 87.

The one-way clutch 87 is fitted and engaged with an end surface cam 88, and on the other hand, the tips of the rollers 90, 90 attached to the operating pieces 89, 89 fixed to the bases of the pair of left and right swing rods 86, 86, A spring 91 is urged so as to press and contact both left and right end surfaces of the end surface cam 88, and a swing shaft 81 swings at predetermined time intervals, as will be described later, and a main body 85 and by extension both left and right swing rods 86, When the claw bodies 92, 92 which are attached downward to the tip of 86 and which are arcuate in side view are lowered toward the plug seedling P in the pot part a shown in FIG. 7, the end face cam is inserted via the one-way clutch 87. 88 becomes non-rotating, the both rollers 90, 90 roll on the thick left and right flat end surfaces of the end face cam 88, and the left and right swing rods 86, 86 rotate around the axis line via the operating pieces 89, 89. The lower ends of the pawls 92, 92 are held in a state where the lower ends of the pawls 92, 92 spread (open) to the left and right (see the solid line in FIG. 7).

Further, when the nail bodies 92, 92 pierce the soil of the plug seedling P (see the state of alternate long and short dash lines in FIG. 7), the rollers 90, 90 fit into the left and right recesses 93, 93 of the end cam 88, and the operating piece Through the 89, 89 and the left and right swing rods 86, 86, the lower end spacings of the left and right claw bodies 92, 92 are narrowed to hold the plug seedling P, and then the main body 85 is rotated upward to move the swing rod 86. When entering the ascending stroke, the end surface cam 88 becomes rotatable due to the action of the one-way clutch 87, and the rollers 90, 90 rotate together with the end surface cam 88 while being fitted in the recesses 93, 93.

Reference numerals 114 and 114 are extruded pipes made of a coil spring loosely fitted to the outer circumference of the pair of left and right claws 92, 92, a flexible synthetic resin pipe having flexibility and a coil spring wound and embedded therein. The base ends of the two extruding pipes 114, 114 are connected to the both claws 9
Nut part 116 of mounting bracket 115 slidably fitted on 2,92
It is fixed to etc.

Reference numeral 117 is an operating rod which is arranged in parallel with the axis of the left and right swing rods 86, 86, is slidably provided on the main body 85, and is biased by the spring 118 toward the tip of the pawl 92. A roller 119 attached to the rear end of the actuating rod 117 fixed to the metal fitting 115 at the tip is brought into contact with the upper surfaces of the pair of left and right cam plates 120, 120 protruding from the lateral moving body 84.

As a result, in the process in which both the claw bodies 92 descend downward,
In response to the upper surface of the main body 95 which rotates in the downward direction moving away from the upper surface of the cam plate 120, the operating rod 117 is retracted via the roller 119, and the pair of extruding pipe bodies 114 and 114 are connected to the base end of the pawl body 92. On the other hand, in the process of retracting so that both the claw bodies 92 rise, the main body 95 rotating upward moves the cam plate 120.
Therefore, when the roller 119 moves along the upper surface of the cam plate 120, the actuating rod 117 is moved (advanced) toward the tip of the pawl 92 by the force of the spring 118.

Further, one operating piece 8 of the pair of operating pieces 89, 89.
The engaging piece 121 projecting from 9 is provided on the outer peripheral surface of the operating rod 117 at the time of retreat in a state where the pair of operating pieces 89 and the pair of rollers 90 attached to the 89 are fitted in the recesses 93 of the end surface cam 88. When the pair of rollers 93 are engaged with the recessed engagement groove 122 to prevent the operating rod 117 from moving forward, and on the contrary, when the pair of rollers 93 are located at a position where the end cam 88 has a large thickness, the operating piece 89 swings. Accordingly, the engaging piece 121 is disengaged from the engaging groove 122, and the operation 117 is performed by the spring 118.
The force causes the claw body 92 to project toward the tip end of the claw body 92, and the mounting metal fitting 115 causes the pair of push-out tube bodies 114, 114 to move to the tip (lower end) of the claw body 92.
It is pushed so that it approaches.

According to this configuration, in the vicinity of the upper limit of the stroke in which both nail bodies 92 picking the plug seedlings P are raised, the tips of the nail bodies 92, 92 are opened to release the nipping for the plug seedlings P,
At this time, substantially at the same time, since the push-out tube body 114 loosely fitted to the outer circumference of each claw body 92 advances toward the tip (lower end) of the claw body 92, the soil in the plug seedlings P attached to both claw bodies 92 is advanced. The part can be pushed downward with the tip of the extruded tube to facilitate the release of the plug seedling P.

In addition, in the above-described embodiment, since the shape of the pawl body 92 is formed in a substantially arcuate shape when viewed from the side, the extruded tubular body 114 follows this curve.
The extruded tube body is formed of a flexible member such as a coil spring so that the movable body can be moved. However, when the claw body is linear, it is not always necessary to use a flexible material. Further, the push-out tube body 114 may be provided only on one of the pair of claw bodies 92, 92.

Reference numeral 95 denotes a transmission case having a second transmission portion 96 for driving the swing shaft 81 and the guide shaft 80, and the first transmission portion 42.
From the transmission shaft 53 via a pair of bevel gears 97, 98 to the rotating shaft 9
Gear 1 that rotates 9 in a fixed direction and attaches it to this rotating shaft 99.
01 is meshed with a driven gear 102 that is loosely fitted to an intermediate shaft 100 arranged concentrically with the swing shaft 81, and is integrated with the intermediate shaft 100 adjacent to the boss outer periphery of the driven gear 102 and the driven gear 102. One end of the torsion spring 104 wound around the outer circumference of the rotating cylindrical body 103 is fixed to the cylindrical body 103, while the other end 104a of the torsion spring 104 is fixed.
Is left in the transmission case 95, and when the driven shaft 102 rotates, a clutch is formed around the outer periphery of the boss portion of the driven shaft 102 to rotate and drive the intermediate shaft 100, and the torsion spring 104 When the tip end side surface of the clutch pin 105 inserted from the outside of the transmission case 95 is abuttingly engaged with the side surface of the other end 104a of the transmission case 95, the winding tightening force of the torsion spring 104 is loosened, and the rotation of the intermediate shaft 100 is stopped. The forward / backward movement of the clutch pin 105 is executed by inputting an electric signal to an electromagnetic solenoid 106 which is an actuator. Gear pairs 107,1 from the intermediate shaft 100
The guide shaft 80 is rotated in a fixed direction via 08.

Further, a rotary arm 109 is attached to an end of the rotary shaft 99 outside the transmission case 95, and the other end of a length-adjustable adjustment link 111 pivotally attached to a tip of the rotary arm 109 is connected to the swing shaft 81. It is rotatably connected to a link 112 that is engaged with and is engaged with, and when the rotating arm 109 makes one rotation, the link 112 swings so as to reciprocate once by an appropriate angle, and swingably drives the swing shaft 81. .

The seedling planting interval detection device associated with the presser wheel 7 is configured to extract a detection signal at predetermined time intervals from the number of revolutions of the presser wheel 7 rolling on the upper surface of the ridge 8.
This detection signal is sent to the controller, and the electromagnetic solenoid 48 of the first transmission section 42 is controlled by the controller.
Also, the electromagnetic solenoid 106 is turned on / off at a predetermined timing in the second transmission section 96.

That is, the operation is started by a detection signal (a pulse signal is output when the traveling machine body 1 travels for the seedling planting interval), and the electromagnetic solenoid 48 of the first transmission section is vertically rocked once for a predetermined period (the multi-cutter 10 and the transplantation mechanism 16 are moved up and down). For a certain period (To)), and the electromagnetic solenoid 106 of the second transmission unit is turned on for an appropriate period (1/3 cycle of the To in the embodiment) of the period (To) first. 80 is driven and kept OFF for the next appropriate period (in the embodiment, 1/3 cycle), the guide shaft 80
Is stopped and is kept ON for the next appropriate period (in the embodiment, 1/3 cycle).

By the intermittent operation of the power transmission of the second transmission portion 96, the lateral moving body 84 is moved until the claws 92, 92 of the seedling take-out mechanism 15 come to the predetermined positions with respect to the pot portions arranged at the right and left at appropriate intervals. It moves, but after the pair of left and right claws 92, 92 are stabbed in the pot part a, the swing rods 86, 86 are moved downward so that the plug seedling P is pulled out. After the plug seedling P has been pulled out, the lateral movement of the lateral moving body 84 is allowed to prevent the pot portion a from interfering with the claw body 92, and the crush accident of the plug seedling P is eliminated. I did so.

Since the rotation of the rotary shaft 99 is unrelated to the electromagnetic solenoid 106 even during this lateral movement stop period, the swing shaft 81 swings via the rotary arm 109, the adjustment link 111, and the link 112.

And the multi-cutter at every one planting interval
When the work of opening the hole 11 in the multi-film 9 by 10 and the implantation of the plug seedling P by the pusher 18 on the upper surface of the ridge 8 is completed once, the electromagnetic solenoids are operated until the next detection signal is output by the seedling planting interval detection device. 48 and 106 keep the non-operating state, the multi-cutter 10 and the pusher 18 of the transplantation mechanism 16 stop in the raised position, and the seedling take-out mechanism 16 also stops. During that time, the belt of the guide and transport mechanism 17 is driven.

[Brief description of drawings]

FIG. 1 is a side view of the transplanter, FIG. 2 is a plan view, FIG. 3 is a rear view, FIG. 4 is a side view of the main parts of the multi-cutter and the transplantation mechanism, and FIG. 5 is VV of FIG. Sectional view, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, FIG. 7 is a side sectional view of the seedling removing mechanism,
8 is a plan view taken along line VIII-VIII of FIG. 7, FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 7, and FIG. 10 is a cross-sectional view taken along line XX of FIG.
11 is a sectional view taken along line XI-XI in FIG. 7, and FIG. 12 is XI in FIG.
It is an I-XII view. 1 ... transplanting machine, 2 ... running machine, 3 ... engine, 4 ...
... front wheel, 5 ... rear wheel, 6 ... steering wheel, 7 ... compression wheel,
8 ... ridge, 8b ... ridge, 9 ... multi-film, 10 ...
Multi-cutter, 12 …… Transplanting device, 13 …… Covering wheel, 14…
… Conveyance mechanism, 15 …… Sprouting mechanism, 16 …… Transplanting mechanism, 17
…… Guide transport mechanism, 18 …… Pushing body, 20 …… Drive axle, 21,25 …… Swing arm, 26 …… Upper and lower interlocking mechanism, 2
7 …… Link rod, 28 …… Spring housing frame, 30 …… Link mechanism, 3
1 …… Rotary handle, 34 …… Flat belt, 35 …… Drive pulley, 37 …… Electric motor, 40,74,95 …… Transmission case, 42…
… 1st transmission part, 45 …… Main shaft, 41, 53 …… Transmission shaft, 46, 104
...... Torsion spring, 48,106 …… Electromagnetic solenoid, 60 …… Transport rod, 61 …… Swing arm, 77 …… Drive pulley, 79 …… Belt, 80 …… Guide shaft, 81 …… Swing shaft, 84… … Lateral moving body, 85 …… Main body, 86 …… Swing rod, 88 …… End cam, 87…
… One way clutch, 92 …… Claw body, 114 …… Extruded tube body, 115 …… Mounting bracket, 117 …… Operating rod, 118 …… Spring, 119 …… Roller, 120 …… Cam plate, 121 …… Engagement Piece, 122
...... Engagement groove.

Claims (1)

(57) [Scope of utility model registration request] 1. A pair of claws vertically oscillates up and down with respect to a plug seedling portion in a seedling take-out portion provided on a traveling machine body, and the plug seedlings are picked and picked out at the tip end of the pair of claws in a descending process. In the seedling take-out mechanism configured to release the plug seedlings with a gap between the tip portions of the pair of nail bodies near the end of the ascending stroke, in at least one of the pair of nail bodies, along the longitudinal direction thereof. The movable extruding tube is loosely fitted, and the extruding tube is retracted toward the proximal end direction of the claws when the claws descend, and when the distance between the tip ends of the claws is widened, A seedling take-out mechanism, characterized in that the tube body is configured to advance so that its tip approaches the tip of the nail body.