JP3365740B2 - Transplanter seedling tray feeder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling tray feeder for a transplanter for vegetables and the like.

[0002]

2. Description of the Related Art As a conventional seedling tray feeding device, there is one described in JP-A-10-33026.
As shown in FIG. 7, this is provided with a seedling placing table 32 that supports a seedling tray T having a plurality of pots arranged vertically and horizontally so as to be vertically feedable. The seedling placing table 32 has a size capable of placing a plurality of seedling trays T in the vertical direction.
A vertical feed drive shaft 40 is laid horizontally in the lower part, and a vertical feed driven shaft 41 is laid horizontally in the upper part.

A drive sprocket 42 is fixed to both ends of the vertical feed drive shaft 40, and a driven sprocket 43 is fixed to both ends of the vertical feed driven shaft 41. The drive sprocket 42 and the driven sprocket 43 are endless. The transport chain 44 is wound. Engagement pins 45 protruding inward in the left and right direction are attached to the transport chain at predetermined intervals, and the engagement pins 45 are fitted in the grooves between the front and rear pot portions of the seedling tray T placed on the support plate 30. To be done.

Therefore, when the seedling tray T is supplied from the upper side of the seedling placing table 32 and engaged with the engaging pins, and the longitudinal feed drive shaft 40 is intermittently rotated in the direction of arrow A shown in FIG.
The transport chain 44 is rotated to intermittently vertically feed the seedling trays T engaged with the engaging pins 45, whereby the pots in a horizontal row of the seedling trays T are moved to the seedling extracting claws 28. Therefore, the seedlings are sequentially fed vertically to the same row at the seedling take-out position Y.

[0005]

FIG. 8 shows a seedling table 32.
The trailing edge T of the downstream side of the seedling trays T placed on
2 shows an example of a contact state between the front end edge T1 on the upstream side and the front end edge T1 on the upstream side. Since the conventional seedling placing table 32 is flat, FIG.
It is more natural that the edges of the seedling trays T on the downstream side and the upstream side abut each other like this, but in such a state, the following problems occur.

That is, as shown in FIG. 7, if the rear end edge T2 of the downstream seedling tray T and the front end edge T1 of the upstream seedling tray T are overlapped with each other, the downstream seedling tray T is upstream. While the groove interval between the front and rear pot parts P is constant over the side seedling tray T, when the edges of the downstream side and the upstream side seedling trays T face each other as shown in FIG. 8, The interval P1 between the front and rear pot parts P in the abutted part is
It becomes longer than the groove interval P2 between the pot portions P.

When such a difference in the lengths of the interval P1 and the interval P2 occurs, the disposition of the engagement pin 45 and the position of the groove on the upstream side seedling tray are deviated and do not match. Then,
As shown in FIG. 8, there is a problem that the engaging pin 45a cannot enter the groove of the seedling tray T on the upstream side. Further, even if the engagement pin 45a enters the groove, the engagement pin 45a is forcibly engaged with the groove and the pot portion P is crushed or engaged with the groove displaced by one in the front-rear direction. Will occur.

In order to avoid this, the operator needs a seedling tray T.
When feeding the seedlings to the seedling placing table 32, care should be taken so that the edges of the seedling trays T on the downstream side and the upstream side do not face each other, but that is very troublesome. The present invention has been made in view of the above problems, and the seedlings of a transplanter such that the rear edge of the seedling tray on the downstream side of the seedling placing table and the front edge of the upstream seedling tray are reliably polymerized. An object is to provide a tray feeding device.

[0009]

The present invention has taken the following technical means in order to achieve the above object. That is, the present invention is provided with a seedling placing table having a support surface for vertically feeding the bottom portion of a seedling tray in which a plurality of pots are vertically and horizontally arranged, and the seedling placing table is provided with a midway portion in the vertical direction. From the seedling tray feeding device of the transplanter, a plurality of engaging portions for longitudinally feeding the seedling tray by engaging in the groove between the front and rear pot portions of the seedling tray are provided at predetermined intervals in the vertical direction. At
The seedling placing table is formed so that a plurality of seedling trays can be placed in the vertical direction, and the position of the front end edge of the seedling tray located on the upstream side and the position of the rear end edge of the seedling tray located on the downstream side. A step is formed on the support surface so as to be vertically displaced.

As described above, since the rear surface of the downstream seedling tray and the upstream front edge of the seedling tray are vertically offset from each other on the support surface, both end edges are formed. Polymerizes spontaneously. Therefore, the engaging portion can surely engage with the groove between the front and rear pot portions of the seedling tray.
As described above, as the step, specifically, the engaging portion is formed in a convex shape upward from the upstream side from the engaging start position where the engaging portion starts engaging with the groove between the front and rear pot portions of the seedling tray. Can be configured as a raised seedling tray pusher.

In this case, the trailing edge of the downstream seedling tray is higher than the leading edge of the upstream seedling tray, and the trailing edge of the upstream seedling tray is below the trailing edge of the downstream seedling tray. The front edge enters. Further, the seedling placing table may be provided with a sensor for detecting the presence or absence of the seedling tray, and the seedling tray push-up portion may be arranged on the downstream side of the sensor.

In this case, when the seedling tray has passed the position of the sensor and the sensor has detected that there is no seedling tray, the rear edge of the seedling tray that has passed the sensor is arranged on the downstream side of the sensor. When the operator pushes up the seedling tray push-up part and the worker supplies a spare seedling tray to the seedling platform in this state, the front edge of the supplied (upstream) seedling tray is the upstream seedling tray. The lower edge of the trailing edge enters and both edges overlap.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a transplanting machine 1 equipped with the seedling tray feeder of the present invention. This transplanting machine 1 is a two-row planting type equipped with a pair of left and right transplanting parts 3 behind a riding type traveling vehicle 2. Thus, the soil block seedlings N grown in the seedling tray T by each transplanting section 3 are automatically planted at predetermined intervals in the ridges while running over the ridges R formed in the field in the longitudinal direction thereof. It is a thing.

On the front part of the vehicle body frame 2A of the traveling vehicle 2, a driving part (not shown) including an engine and a mission is mounted, and the driving part is covered with a bonnet 4 and the bonnet 4 A steering section having a steering wheel 5 is provided at the rear portion, and a driver's seat 6 is provided behind the steering section. The body frame 2A is supported by a pair of left and right front wheels 7 and a pair of left and right rear wheels 8 so that the vehicle body frame 2A can travel.

A mounting bracket 13 is mounted on the rear portion of the vehicle body frame 2A via a lifting link mechanism 12 having a top link 10 and a pair of left and right lower links 11 so that the mounting bracket 13 can be lifted and lowered by the elevating and lowering movement of a lifting cylinder 16, and the mounting is carried out. A transplantation frame 15 having a pair of left and right transplantation parts 3 mounted thereon is connected to the bracket 13. Here, as shown in FIG. 2 and FIG. 5, even if the ridge R is meanderingly formed in the transplanting frame 15 or the transplanting machine 1 is meandering, the planting position of the seedling with respect to the ridge R is appropriate. To correct to the horizontal position,
The ridge-following sensors 60 are provided on both left and right sides.

The ridge-following sensor 60, as shown in FIG.
An attachment rod 159 is fixed to the transplantation frame 15 via left and right attachment members 158, and the ridge R is attached to the attachment rod 159.
The first detecting means 161L and the second detecting means 161L that are in sliding contact with each other along the outer side of the
The detection means 161R and the detection means 161R are mounted so as to be movable in the left-right direction. That is, U-shaped holding pieces 165 are slidably fitted in the left and right directions on both sides of the mounting rod 159, and the holding pieces 165 are tightened and fixed to the mounting rod 159 by butterfly bolts 166. Therefore, the clamping piece 165 can be moved and adjusted in the left and right direction by tightening and loosening the butterfly bolt 166.

Further, a pair of left and right swing plates 169 are attached to each holding piece 165 via a fixed plate 168 so as to be swingable around a vertical axis 170. A pair of left and right sliding contact plates 173 are attached to the pair of rocking plates 169 via support arms 171 respectively.
L and 173R are respectively supported around the support shaft 174 so as to be vertically movable. A spring 175 is connected between each rocking plate 169 and the support arm 171, and the spring 175 serves as a sliding contact plate 17.
3L and 173R are urged downward around the support shaft 174, respectively. Further, a stopper 178 is provided on the swinging plate 169 via a support piece 177 so as to be adjustable upward and backward so that the stopper 178 resists the spring 175 and slides the contact plates 173L, 173L.
It is restricted to move the 3R forward around the support shaft 174.

Limit switches 179L and 179R are provided on each swing plate 169, and the slide plate 173 is provided.
When L and 173 are pushed laterally outward by the outer side of the ridge 157, the sliding plates 173L and 173R swing laterally outward around the vertical axis 170 together with the swing plate 169, and the swing plates 16
9 presses the limit switches 179L and 179R respectively, whereby the limit switches 179L and 179R are turned on.

Therefore, the first detecting means 161L includes the holding piece 165 on the left side, the swinging plate 169, the supporting arm 171,
The sliding contact plate 173L, the limit switch 179L, and the like are included. The first detection unit 161L is the limit switch 1
When the 79L is turned on, the displacement of the transplanting part 30 to the left with respect to the ridge 157 is detected. In addition, the second detection means 161R includes the right holding piece 16
5, swing plate 169, support arm 171, sliding contact plate 173
R, limit switch 179R, etc.
The detection means 161R is adapted to detect the left position shift of the transplant portion 30 with respect to the ridge R when the limit switch 179R is turned on.

Since the ridge-following sensor 60 is not necessary during simple movement, the slide contact plate 173 is attached to the support arm 17
A swinging plate 169 is provided with a holding portion 180 for rotating the shaft 174 together with the shaft 1 around the supporting shaft 174 and fixing the sliding contact plate 173 and the supporting arm 171 at the upper position. The holding portion 180 has a hook formed at its tip so that the support arm 171 can be hooked at an upper position, and the support arm can be fixed in a state shown by a chain double-dashed line in FIG. Does not get in the way when moving.

The holding portion 180 is provided in the transplantation frame 15
Etc. can be provided at appropriate places. The transplanting part 3
As shown in FIG. 2, a seedling tray feeding device 18 to which a cell seedling tray T having a large number of pot portions P in which soil block seedlings N have been raised vertically and horizontally is attached, and a seedling tray feeding device 1
8. A seedling take-out device 20 that picks up the soil block seedlings N one by one from the seedling tray T on 8 and conveys them to the planting device 19, and a planting for planting the seedling N passed from the seedling take-out device 20 in the ridge R It is mainly composed of the device 19.

Power is transmitted from the PTO shaft of the traveling vehicle 2 to the drive main shaft 24 via the first transmission shaft 21, the second transmission shaft 22, the electromagnetic clutch 23, etc., and the drive main shaft 24 constitutes the transplant portion 3. The power is branched to each of the devices 18, 19 and 20 to be operated. The planting device 19 has a planting body 25 which pierces the ridge R and plants the seedling N held therein, and the planting body 25 swings up and down and back and forth via a swing link mechanism (not shown). It is movably supported by the implant frame 15. The planting body 25 is supplied with the seedling N from the seedling take-out device 20 at the upper part of its locus, and pierces the ridge R at the lower part of the locus to plant the seedling N.

The seedling take-out device 20, as shown in FIG.
The seedling take-out pawl 28 is moved to the seedling tray feeding device 1 by the pawl operating mechanism 27 which is operated by the rotational power transmitted to the main shaft 26.
Reciprocating between the seedling tray T on 8 and the plant 25,
Soil block seedlings N are taken out one by one from the pot portion P sent to the predetermined seedling taking-out position Y by the seedling taking-out claws 28 and are supplied to the planting body 25.

As the seedling take-out device 20, the push-out means for pushing out the seedling N from the bottom side with respect to the pot portion P of the seedling tray T on the seedling tray feeding device 18, and the pushed-out seedling to the planting body. It is possible to replace with a conventionally known device such as a device configured with a transfer means for transferring, or a device for simultaneously taking out the seedlings N from the pot portions P arranged in a row. As shown in FIGS. 1 to 4, the seedling tray feeding device 18 includes a support plate (support surface) 30 that supports the bottom portion of the seedling tray T over the pots P in a horizontal row, and the left and right sides of the support plate 30. It has a seedling placing table 32 composed of left and right side plates 31 fixed to the portion, and this seedling placing table 32 is supported on the transplantation frame 15 via guide rails 33, rollers 34, etc. so as to be movable left and right. There is.

The seedling placing table 32 is of a size capable of placing two seedling trays 2 in the vertical direction, and the support plate 30 thereof is flat in the vertical direction. Further, the seedling placing table 32 is stopped while the seedling N is taken out from the pot part P by the seedling taking nail 28,
After the seedling is taken out, the seedling N is supplied to the planting body 25 and returned to its original position by the lateral feed mechanism 35 to move the pot 1 horizontally.
It is configured to be intermittently horizontally fed by the pitch, and when the seedlings N for one horizontal row of the seedling tray T are taken out, the seedling tray T is vertically fed by one pitch in the vertical direction of the pot part P. The vertical feeding mechanism 36 is provided.

The lateral feed mechanism 35 includes a lateral feed shaft 37 arranged on the back side of the seedling placing table 32 in the left-right direction, and both ends of the lateral feed shaft 37 are axially arranged on the transplantation frame 15 via a support frame. It is rotatably supported. Also, the horizontal feed shaft 3
A transmission gearbox 38 is provided at one end of 7, and rotational power from the drive main shaft 24 is input to the transmission gearbox 38 so that the lateral feed shaft 37 is rotationally driven.

A Napier screw having a so-called traverse groove 37a formed over substantially the entire length in the axial direction is used for the lateral feed shaft 37, and a sliding body 39 engaging with the groove 37a is attached to the lateral feed shaft 37. This sliding body 37 is fitted and the seedling placing table 32 is attached.
Is connected to the bottom of. Therefore, the sliding body 39 is moved left and right by intermittently rotating the lateral feed shaft 37, and the seedling placing table 32 connected thereto is intermittently reciprocally laterally fed.

A vertical feed drive shaft 40 is laid horizontally in the lower part of the side plate 31 of the seedling placing table 32, and a vertical feed driven shaft 41 is laid horizontally in the upper part of the side plate 31.
Further, drive sprockets 42 are fixed to both ends of the vertical feed drive shaft 40, and driven sprockets 43 are fixed to both ends of the vertical feed driven shaft 41.
2 and the driven sprocket 43 have an endless transport chain 4
4 is wound.

The vertical feed mechanism 36 includes a vertical feed cam 46 fixed to both left and right ends of a horizontal feed shaft 37 and a seedling stand 32.
A vertical feed operating shaft 47 that is installed between the side plates 31 of
A follower 47a that engages with the vertical feed cam 46 when the seedling placing table 32 moves to the left end or the right end is provided at both ends of the vertical feed operation shaft 47. It projects from the side plate 31 of the seedling placing table 32 together with one end of the drive shaft 40.

A swinging link 48 is fixed to the projecting portion of the vertical feed operating shaft 47, and a pair of left and right drives having engaging teeth with which the swinging link 48 engages with the projecting portion of the vertical feed drive shaft 40. One-way clutch 50 for rotating the gear 49 and the vertical feed drive shaft 40 only in the vertical feed direction of the seedling tray T.
Is fixed. Therefore, when the seedling placing table 32 reaches the left or right movement limit, the follower 47a engages with the vertical feed cam 46 to slightly rotate the vertical feed operating shaft 47,
As a result, the rocking link 48 is rocked, and one of the drive gears 49 is rotated by one engagement tooth by the rocking of the rocking link 48, and the vertical feed drive shaft 40 is rotationally driven to convey. The chain 44 is rotated and the pot portion P of the seedling tray T is vertically fed by one pitch.

The horizontal feed mechanism 35 and the vertical feed mechanism 36 may be provided on the left and right seedling placing tables 32, respectively.
By providing the transverse feeding mechanism 35 only on one seedling placing base 32 and connecting the left and right seedling placing bases 32 with a connecting rod or the like, both the seedling placing bases 32 can be integrally reciprocally laterally fed, and longitudinal feeding The mechanism 36 is also provided only on one of the left and right sides (the side on which the transverse feed mechanism 35 is provided), and the longitudinal feed drive shafts 40 of each other are provided.
By forming a single continuous shaft, it is possible to rotate the vertical feed drive shaft 40 to rotate the transport chains 44 of the left and right seedling placing bases 32 and feed the left and right seedling trays T at the same time.

A chain passage hole 30a is formed in the support plate 30 of the seedling placing table 32 at a position corresponding to the driven sprocket 43, that is, at a midway portion of the seedling placing table 32 in the vertical direction. ing. Engaging pins 45 protruding inward in the left and right direction are attached to the transport chain 44 at predetermined intervals, and the engaging pins 45 that pass through the chain passage holes 30a and move above the support plate 30 are supported. It engages with the groove between the front and rear pot parts P of the seedling tray T placed on the plate 30.

In the vicinity of the chain passage hole 30a,
It is the engagement start position X where the engagement pin 45 starts to engage with the seedling tray T on the upstream side. When the seedling tray T is supplied from the upper side of the seedling placing table 32 and engaged with the engaging pins, and the vertical feed drive shaft 40 is intermittently rotated in the direction of arrow A shown in FIG. 4, the transport chain 44 rotates. The seedling trays T that have been run and engaged with the engaging pins 45 are intermittently vertically fed, and as a result, the pot portions P in a horizontal row of the seedling trays T are provided.
Are sequentially fed vertically to the same row of the seedling take-out position Y by the seedling take-out claw 28.

A seedling tray push-up portion 62 is formed on the support plate 30 of the seedling placing table 32 on the downstream side of the chain insertion hole 30a. This seedling tray push-up portion 62 has a certain width in the vertical direction and extends over the entire lateral direction of the seedling placing table 32.
As shown in FIG. 1, the support plate 30 is formed in a convex shape upward from other places, and is for pushing up the seedling tray on the seedling tray push-up portion 62.

Further, the position of the seedling tray push-up portion 62 is such that when the front end of the seedling tray T is at the seedling taking-out position Y by the seedling taking-out pawl 28, the pot portion P at the rear end T2 of the seedling tray T pushes the seedling tray. It is also a position that exists on the raising portion 62. Therefore, when the front end of the seedling tray T is at the seedling taking-out position Y by the seedling taking-out nail 28, the rear end edge T2 of the seedling tray T.
Is located at a position higher than the front edge T1 of the upstream seedling tray T, and the front edge T1 of the upstream seedling tray T enters below the rear edge T2 of the downstream seedling tray T. Therefore,
From the seedling tray T on the downstream side to the seedling tray T on the upstream side, the interval pitch between the front and rear pot portions P becomes constant.

At this time, as shown in FIG. 1, the front portion of the auxiliary seedling tray T on the upstream side is located in the vicinity of the engagement start position X and the engaging pin 45 for the seedling tray T on the upstream side. Is in a position where the first engagement of the can occur. Then, as described above, both end edges T1, T2 of the downstream and upstream seedling trays T
Are in the overlapping state, and the interval pitch between the front and rear pot portions P is constant from the seedling tray T on the downstream side to the seedling tray T on the upstream side. Even with respect to, the engagement is smooth. Therefore, the pot portion P is prevented from being crushed by the engagement pin 45.

Here, on the support plate 30 of the seedling placing table 32,
As shown in FIG. 2, a seedling tray detection sensor 64 for detecting that the number of placed seedling trays T is one is provided. The detection sensor 64 is arranged at a position slightly upstream of the rear end of the seedling tray T when the front end of the single seedling tray T is at the seedling taking-out position Y by the seedling taking nail 28. By detecting the presence or absence of the seedling tray T at the position, it is detected that the number of the seedling trays T on the seedling placing table 32 is one.

That is, when the two seedling trays T are placed on the seedling placing table 32, the seedling tray T is present on the detection sensor 64, but the seedling tray T is vertically fed and the seedling placing table 3 is placed.
When the number of seedling trays T on 2 is one, the number of seedling trays T does not exist on the detection sensor 64, and it is detected that the number of seedling trays T is one. When the number of seedling trays T becomes one, an alarm buzzer or an alarm lamp notifies the operator that the number of seedlings becomes one, and prompts the supply of seedling trays T.

It should be noted that this detection sensor 64 is used for the support plate 30.
Is pivotally attached to the back surface of the supporting plate 30 so as to be swingable up and down, and can be moved back and forth through an opening formed in the support plate 30, and is biased so as to project upward from the opening. Then, the bottom of the pot P of the seedling tray T is pressed downward so that the opening / closing is performed. The seedling tray push-up portion 62 is located immediately downstream of such a detection sensor 64, and the detection sensor 6
4 detects that the number of seedling trays T has become one (no seedling tray is present at the position of the detection sensor 64), the rear end of the seedling tray T is just the seedling tray pushing part 62.
Located on top.

Therefore, when the operator tries to supplement the seedling tray T by the notification from the detection sensor 64,
The rear end of the seedling tray T on the seedling placing table 32 is the seedling tray pusher 6
Since it is pushed up by 2, the front end edge of the replenished seedling tray T and the rear end edge of the downstream seedling tray T are naturally polymerized. FIG. 6 shows a modified example of the seedling tray feeding device 18 according to the present invention. What is different from that shown in FIG. 1 is that the downstream side portion of the seedling tray pushing portion 62 is formed in a downward concave shape. Others are the same as those in FIG.

The present invention is not limited to the above embodiment. That is, in the present invention, when the upstream seedling tray T tries to engage with the engagement pin 45 at the engagement start position X for the first time, the upstream end seedling tray T and the downstream edge T1 of the upstream seedling tray T Rear edge T of the side seedling tray T
It suffices that 2 and 3 are superposed, and the rear end edge T2 of the seedling tray T on the downstream side may be located below the seedling tray T on the upstream side rather than above.

That is, the upstream side from the engagement start position X is
It may be formed in a convex shape with respect to the downstream side (the downstream side is concave with respect to the upstream side). In addition, the steps (recesses and protrusions) exemplified as the seedling tray push-up portion 62 in the above-described embodiment are not only near the engagement start position X but also from the engagement start position X toward the downstream side or the upstream side. It may be formed entirely.

[0043]

EFFECTS OF THE INVENTION Since the rear edge of the seedling tray on the downstream side of the seedling placing table and the front edge of the upstream seedling tray are reliably overlapped with each other, the engaging portion surely engages with the groove between the front and rear pot portions. be able to.

[Brief description of drawings]

FIG. 1 is a side sectional view of a seedling tray feeder according to the present invention.

FIG. 2 is an overall side view of a transplanter equipped with a seedling tray feeder.

FIG. 3 is a front view of a seedling tray feeder.

FIG. 4 is a side view of the seedling tray feeder near the seedling take-out position.

FIG. 5 is a side view of a ridge-following sensor.

FIG. 6 is a side sectional view of a seedling feeding device according to a second embodiment.

FIG. 7 is a side sectional view of a conventional seedling feeding device.

FIG. 8 is a side view showing a state in which a front end edge of a seedling tray on the upstream side and a rear end edge of a downstream seedling tray face each other in a conventional seedling feeding device.

[Explanation of symbols]

1 transplanter 18 Seedling tray feeder 30 Support plate (support surface) 32 seedling stand 45 Engagement pin (engagement part) 62 Seedling tray pusher 64 Seedling tray detection sensor T seedling tray T1 (seedling tray) front edge T2 rear edge (of seedling tray) P pot section

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Claims (3)

(57) [Claims] 1. A seedling placing table (32) provided with a support surface (30) for supporting vertically the bottom of a seedling tray (T) having a plurality of pots (P) arranged in a row and column. The seedling tray (T) is vertically fed by engaging with the groove between the front and rear pot portions (P) of the seedling tray (T) from the midway portion of the seedling placing table (32) in the vertical direction. Engaging part (45)
In the seedling tray feeder of the transplanter in which a plurality of seedling trays are provided at predetermined intervals in the vertical direction, the seedling placing table (32) is formed so that a plurality of seedling trays can be placed in the vertical direction, and is located on the upstream side. The position of the front edge (T1) of the seedling tray (T) and the rear edge (T) of the seedling tray (T) located on the downstream side
The seedling tray feeding device of the transplanter in which a step is formed on the support surface (30) so that the position of 2) is vertically displaced. 2. The step is at a position downstream from an engagement start position (X) at which the engagement portion (45) starts to engage with the groove between the front and rear pot portions (P) of the seedling tray, and from the upstream side. The seedling tray feeder of the transplanter according to claim 1, which is configured as a seedling tray push-up portion (62) formed in a convex shape. 3. The seedling tray (T) is provided on the seedling placing table (32).
The seedling tray feeding device for a transplanter according to claim 2, further comprising a sensor (64) for detecting the presence or absence of the seedling tray, and the seedling tray push-up portion (62) is arranged on the downstream side of the sensor (64).