JPH10178827A - Seedling transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately supply seedlings taken out from a seedling box to a seedling planting device. SOLUTION: This seedling transplanter is provided with a seedling holder 32a for receiving the seedlings for one lateral column taken out from the respective pots of the seedling box for which many pots for housing the seedlings stump by stump are arrayed crisscrossed and moving the seedlings to a lower part while holding them, a seedling take-out tool 33a for taking out the seedlings for one lateral column from the seedling holder 32a when the seedling holder 32a is moved to a prescribed seedling take-out position Q and a seedling feed belt 34a for receiving the seedlings for one lateral column taken out from the seedling holder 32a by the seedling take-out tool 33a on a lower side, mounting the seedlings and carrying them to the seedling taking position of the seedling planting device 35 in the arrayed direction of the seedlings. In this case, when the seedling holder 32a is present near the seedling take-out position Q, the operation speed of the seedling feed belt 34a is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling transplanter for removing seedlings from pots in a seedling box in which a large number of pots for accommodating seedlings one by one are arranged vertically and horizontally and planting them in a field.

[0002]

2. Description of the Related Art Seedlings grown in a flexible seedling box in which a large number of pots accommodating seedlings one by one are arranged vertically and horizontally are loaded into a planting section together with the seedling box, and the seedling box is transferred to a predetermined transport path. In the middle of the transfer, a seedling push pin is inserted into the pot of the seedling box through a hole formed at the bottom of the seedling box to push out a row of seedlings from the seedling box, and the pushed seedlings are removed. The received seedling holder moves downward in an arc-shaped trajectory, and the seedling removal tool is inserted into the seedling holder of the seedling holder at the lower end of the movement trajectory where the moving direction of the seedling holder is almost horizontal. Seedling transplanter having a configuration in which a row of seedlings is taken out from the plant and dropped on a seedling feed belt, and the seedling feed belt conveys the seedlings in the lateral direction and supplies them one by one to a seedling picking position of the seedling planting apparatus. There is.

[0003]

The seedling feed belt is provided with a projection on the outer peripheral surface thereof for preventing displacement of the seedlings. In the conventional one, the seedling feed belt operates at a constant speed. Since the seedlings were falling there,
If the height of the projection is too high, there is a risk that the falling seedling may hit the projection and change the orientation of the seedling, and the height of the projection cannot be made too high. For this reason, the position of the seedlings is not stabilized during the transfer of the seedlings by the seedling feed belt, and the timing of the supply of the seedlings to the seedling picking position of the seedling planting apparatus is inconsistent, which affects the accuracy of seedling planting. Had.

[0004]

In order to solve the above problems, the present invention has the following arrangement. That is, the seedling transplanter according to the present invention receives one row of seedlings taken out of each pot of a seedling box in which a large number of pots accommodating one seedling are arranged vertically and horizontally, and moves downward while holding the seedlings A seedling holder to be removed, a seedling removal tool for removing a row of seedlings from the seedling holder when the seedling holder has moved to a predetermined seedling removal position, and a row of seedlings removed from the seedling holder by the seedling removal tool. In a seedling transplanter equipped with a seedling receiving belt that receives the seedlings on the lower side and places the seedlings thereon and conveys the seedlings in the direction of arrangement of the seedlings to the seedling picking position of the seedling planting device, when the seedling holder is near the seedling picking position, The operation speed of the seedling feeding belt is reduced.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Seedling transplanter 1 shown in the drawings.
Is mounted on the rear side of the riding type traveling body 2 via a link device 3 so as to be capable of ascending and descending a six-row planting portion 4. Hopper 5a
And a fertilizer feeding device 5b for feeding the fertilizer for each strip. The seedling transplanter 1 is for planting paddy rice seedlings in a paddy field, but the present invention is not limited to this, and is also applicable to a seedling transplanter for planting vegetable seedlings in a field.

The traveling vehicle body 2 comprises a pair of left and right steering front wheels 6, 6 which are driven and rotated, and a pair of left and right rear wheels 7, 7 which are driven and rotated.
The transmission case 9 is mounted on the front side of the frame 8 and the engine E is mounted on the rear side. The rotational power of the engine E is transmitted once by a belt transmission 10 to a hydraulic pump mounted on the upper part of the transmission case 9 and from there. The transmission is transmitted into the transmission case 9 by a belt transmission 11 capable of continuously variable transmission operation. And mission case 9
The power shifted by the transmission inside the front wheel
6 and the rear wheels 7, 7 and a transmission shaft 9a,
Power is transmitted to the planting section 4 via the intermediate gear case 9b and the transmission shaft 9c. In the figure, reference numeral 12 denotes a steering wheel for steering the front wheels 6, 6, reference numeral 13 denotes a seat on which the driver sits, and reference numeral 14 denotes a step floor for the driver to move on the running vehicle body.

The link device 3 includes a frame 8 of the traveling vehicle body 2.
The upper link 15a
The lower link 15a and the lower link 15b are rotatably mounted, and the vertical link 15c is connected to the rear ends of these upper and lower links. A connecting shaft 16 'integrated with a planting transmission case 16 at the center of the planting portion 4 is rotatably connected to a connecting bearing portion 15c' projecting rearward from the lower end of the vertical link 15c. The unit 4 is mounted to be rotatable left and right with respect to the traveling direction. Further, a hydraulic cylinder 17 for driving the link device 3 is provided with the base side attached to the frame 8, and the piston rod side is connected to the upper link 1.
Arms 15a ', which are integrally fixed downward from the bases of 5a and 15a, are connected via a spring to the distal end. When the hydraulic cylinder 17 expands and contracts, the upper and lower links 15a, 15a, 15b, and 15b rotate around the support shaft on the link base 8a side, and the planting portion 4 moves up and down. The operation of the hydraulic cylinder 17 is controlled by a hydraulic valve 18 provided in the planting section 4.

[0008] On the left and right sides of the front of the traveling vehicle body 2, spare seedling mounts 20, 20 are provided for holding seedling boxes for replenishment. Further, on both front left and right sides of the traveling vehicle body 2, line drawing markers 21, 21 for delineating the course of the traveling vehicle body 2 in the next step in a field scene are provided so as to be capable of switching over.

[0009] The planting section 4 has a six-row planting configuration and is provided with two sets of two sets of seedling box transfer devices 30, 30, 30, first seedling removal devices 31, 31, 31 and first seedling transfer devices 32, 31. 32.3
2. Second seedling removal devices 33, 33, 33, second seedling transport devices 34, 34, 34, seedling planting device 3 provided for each strip
5 and so on.

A seedling box C used in the seedling transplanter 1 is a plastic seedling box having flexibility and has a shape as shown in FIGS. That is, the small pots C ′ are arranged at predetermined intervals in the left, right, front and rear directions, the openings C′a are connected to each other, and the bottoms C′b. Further, square holes Cb for feeding seedling boxes are provided at left and right edge portions Ca and Ca along the longitudinal direction of the seedling box C in accordance with the longitudinal distance of the pots C ′. The bottom C'b of each pot C 'is provided with a cut C'c through which the seedling push-out pin 31a described below can enter from the bottom side. Cc is a wide interval portion provided at the center in the left and right (transverse directions) toward the longitudinal direction. Each pot C 'is filled with floor soil, sowed, covered, and raised.

A plurality of seedling boxes C are loaded into the seedling box transporting devices 30. The seedlings are simultaneously extruded from the row of pots of the seedling box conveyed to the seedling pushing position P by the seedling box conveying devices 30 by the first seedling extracting devices 31. The extruded seedlings are stored in the seedling holders 32a of the first seedling transfer device 32.
, And is conveyed along a locus that draws an arc toward the lower front side.
Are dropped on the seedling feed belts 34a.
The seedlings are laterally fed by the seedling feed belts 34a, 34a,.・ 35 ... take seedlings one by one and plant them in the field.

A center float 36 is provided below the planting section 4.
And a pair of left and right side floats 37 are provided, and during planting work, these floats slide while leveling the field scene. Each of these floats 36, 37, 37
Are attached to the field scene near the seedling planting position of each line, and a U-shaped fertilizer guide 5c having a rear cross-section in plan view is provided on the rear side thereof. Are attached, and fertilizing hoses 5d for transferring the fertilizer fed from the fertilizer feeding device 5b are connected to each strip. The center float 36 is also a sensor for detecting unevenness in the field scene, and the spool of the hydraulic valve 18 is operated according to the vertical movement of the center float 36. That is, when the center float 36 moves upward, the hydraulic valve 1 is moved in the direction in which the hydraulic cylinder 17 is extended.
When the center float 36 is moved downward, the hydraulic valve 18 is operated in a direction to contract the hydraulic cylinder 17. Thus, the planting unit 4 is controlled so as to maintain a constant height with respect to the field scene.

Next, the configuration of each section of the planting section 4 will be described. Three seedling box transfer devices 30 are provided at the center and left and right. Each seedling box transport device 30 is provided with two upper and lower seedling box supply sections 30a, 30a provided in a state inclined backward and downward.
And a seedling box transport section 30b that joins the seedling box transport path from the two-stage seedling box feeding section, extends downward, and further curves forwardly upward in a U-shape in a side view. Part 30a
An empty box transport unit 3 that extends upward to just below 30a
0c, and an empty box housing frame 30d capable of housing a plurality of empty seedling boxes discharged from the outlet of the empty box transport section in a vertically stacked state.

The seedling boxes placed on the upper and lower two-stage seedling box supply sections 30a are slid down by their own weight and supplied one by one to the seedling box transport section 30b. Near the seedling pushing position P of the seedling box transport section 30b, there is provided a seedling box feeder 40 that locks the seedling box at the seedling pushing position P and feeds the seedling boxes one row at a time at appropriate timing. This seedling box feeder 40
A pair of left and right feed claws 40 that reciprocate along the seedling box transport path.
a · 40a and locking pawls 40b ·
40b, the claw portions of the feed claws 40a, 40a enter the openings formed in the left and right transport guides 30b ', 30b', and the square holes Cb, Cb of the seedling box located in the openings.
When the feeding claw is moved upward from the state where it is engaged with, and moves over the next square hole and is then moved down again, the seedling boxes are fed one row at a time in the horizontal direction of the pot.

The operating mechanism of the seedling box feeder 40 includes a drive plate 40d attached to a seedling box feed drive shaft 40c protruding from the left side of the planting transmission case 16 so as to rotate integrally therewith;
Crank arm 40e linked to feed pawls 40a
Are connected by a rod 40f, and the feed claw 4 is moved by the action of a seedling box feed cam 45c (see FIG. 8) provided in the planting operation case 16.
Seedling box feed drive shaft 4 so that 0a and 40a operate upward.
0c, and the seedling box feed drive shaft 40c is turned so that the feed claws 40a are operated downward by the action of the spring 40h. The left and right crank arms 40e and 40e 'are connected to the seedling box transport section 30.
It is attached so as to rotate integrally with a rotating shaft 40g that is supported by penetrating the inside of the U-shaped portion b from side to side. A seedling box feed manual lever 41 is integrally attached to the drive plate 40d. The seedling box feed device 40 is not only driven by the rotation of the feed drive shaft 40c but also by the swing operation of the seedling box feed manual lever 41. Feed operation.

The first seedling removal device 31 pushes out the seedlings in the horizontal row of pots located at the seedling pushing position P from the seedling boxes being transported by the seedling box transporting device 30 with seedling pushing pins 31a that slide. Device. An extruding drive arm 32c attached to the left projecting portion of the common drive shaft 31b of the first seedling removal device 31, the first seedling transfer device 32, and the second seedling removal device 32 provided in the planting transmission case 16 connects the telescopic rod 31d. The operating arm 31g is attached to the push-out operating shaft 31f of the push-out operating case 31e so as to rotate integrally therewith.
And a fan-shaped pinion gear 31h provided so as to rotate integrally with the pushing operation shaft 31f and the pushing operation case 31e meshes with a rack of the pushing shaft 31i integrally connected with the seedling pushing pins 31a. I have. Therefore, the rotation of the common drive shaft 31b causes the pushing shaft 31i to rotate.
Slides. The seedling pushing pins 31a are in the seedling box C
Are provided at the same number and pitch for the horizontal pots C ′, and the extrusion holes 31k of the extrusion pin guide 31j are provided.
., And pushes out a cut C′c... Formed at the bottom C′b... Of one horizontal row of pots C ′. This seedling push pin 31
The slide operation of a ... projects when the feeding operation of the seedling box feeding device 40 is completed and the seedling box is locked, and
The retraction is completed before the next seedling box movement by the seedling box feeding device is started.

The first seedling transfer device 32 includes a seedling pushing pin 31.
The seedling holders 32a are stopped at the seedling receiving position (seedling pushing position) P before the projecting operation (seedling pushing operation) of a ... starts, and the first seedling extracting device 31 pushes out one horizontal row. When the seedling holders 32a receive the seedlings and the retracting operation of the seedling push-out pins 31a is completed, the seedling holders 32a start to move downward and transport the seedlings to the seedling removal position Q,
When the second seedling conveying device 34 has just conveyed the previously received seedlings to the left and right seedling collecting positions, the seedling holder 3
Operate so that the seedlings held by 2a are transferred by the second seedling removal device 33 onto the seedling feed belts 34a of the second seedling transport device 34. Then, the seedling holder 32 again
a move upward and return to the seedling receiving position P.

The first seedling transfer device 32 includes a swing drive arm 32c attached to the right projecting portion of the common drive shaft 31b so as to rotate integrally with the common drive shaft 31b. One swing arm 32d
Are interlocked via a telescopic rod 32e to a swing operation arm 32d 'which rotates integrally with the lower swing arm. The tip of the swing arm 32d is a support plate 32f fixed to the left and right ends of the seedling holder 32a.
A swing arm 32d, which is pivotally attached to the shaft 32f and swings around the swing shafts 32h, 32h, and the support plates 32f, 32f, constitutes a parallel link. When the swing drive arm 32c is driven and rotated, the seedling holder 32a reciprocates along a locus that draws an arc between the seedling receiving position P (shown by a chain line in FIG. 3) and the seedling extracting position Q (shown by a solid line in FIG. 3). Moving.

The swing arm 32d moves upward by the drive rotation of the swing drive arm 32c, and the seedling holder 32a moves upward.
When reaches the upper end of the movement locus, the lower swing arm stops against the stopper bodies 32g. The swing drive arm 32c still rotates and the swing arm 32d
.. Are moved upward, but the telescopic rod 32e is extended (the spring 32e ″ in the spring case 32e ′ of the telescopic rod 32e is contracted), and the swing arm remains stopped by the stopper bodies 32g. .
Therefore, the lower swing arm is the stopper body 32g
While being stopped by hitting 32g, the seedling holder 32a is located at the upper end of the movement locus, and the first seedling removal device 31
Receive the seedlings extruded by. Seedling holder 3
2 moves upward, an arm 32h 'integrated with the swing shaft 32h is attached to the end of a spring 32h.
Since the operation is performed so as to extend h ″, the momentum when the swing arm is moved upward is killed, and the impact when the lower swing arm hits the stopper bodies 32g and 32g and stops is reduced.

The seedling holder 32a has a first seedling removal device 3
Receiving the seedlings extruded by the step 1, the concave seedling holding portions 32i are formed in accordance with the left and right positions of the pots of the seedling boxes conveyed by the seedling box conveying device 30. Then, on the bottom of the seedling holding portions 32i,
2j are provided respectively. This seedling retaining claw 32
j are integrally attached to a rotating shaft 32k which penetrates the base of the seedling holder 32a in the lateral direction, and the rotating shaft 3 is arranged so that the claws protrude upward from the bottom of the seedling holding portions 32i.
2k is a spring 32l attached to both left and right outer ends
Urged by 32l. Thereby, when the seedlings move in the seedling holding portion in the seedling pushing direction of the first seedling extracting device 31 and the seedling extracting direction of the second seedling extracting device 33, the seedling retaining claws 32j are retracted from the seedling holding portion 32i, And when the seedling moves in the opposite direction, the seedling retaining claw 32j
Project into the seedling holding portions 32i, and the tips of the projecting portions are hardly inserted into the seedling bed. It should be noted that 2 in the left and right central portions of the seedling holder 32a.
The two rotating shafts 32k are provided to face each other.

Further, a claw rotation arm 32m that rotates integrally with the two rotation shafts is attached to the left and right center sides of the rotation shafts 32k and 32k, and an operation arm 32n is attached to the boss portion of the claw rotation arm.
Is rotatably fitted on the outer surface of the claw rotating arm 3 by a pair of stoppers 32n 'and 32n' formed on the operation arm.
The rotation of 2 m is restricted. A roller 32n "is rotatably attached to the tip of the operation arm 32n, and a spring for urging the lower end of the operation arm 32n so as to rotate the claw rotation arm 32m in a direction in which the claw 32j projects upward. 32o is attached.Spring 32o
The other end is hooked on a connecting pipe 32f 'connecting the left and right support pipes 32f, 32f, and a center connecting member 32f "connecting the left and right central portions of the connecting pipe 32f' and the left and right central portions of the seedling holder 32a. The spring 32o urges the rotating shafts 32k, 32k because the springs 32l are driven by the rotating shafts 32k, 32k.
It is set stronger than the force for urging 32k.

When the seedling holder 32a is located at the upper end of the movement locus, the roller 32n "hits the upper cam plate 32p attached to the left and right center rear sides of the seedling box transporting section 30b, and the operating arm 32n is pushed down, and the claw pivots. Arm 32m
Are forcibly rotated so that the seedling retaining claws 32j are retracted from the bottom of the seedling holding portions 32i. The seedling retaining claws 32j are rotatable against the springs 32l within the range of the pair of stoppers 32n ', 32n', and the seedling is pushed into the seedling holder 32a in this state. Therefore, the seedlings are pushed into the seedling holder 32a while giving a little resistance by the seedling retaining claws 32j that are biased by the weak springs 32l, so that the seedlings hold securely without the seedlings jumping out. Is held within.

When the seedling holder 32a moves down, the roller 32n "comes off from the upper cam plate 32p, so that the operation arm 32n becomes free.
O also acts on the seedling retaining claws 32j. Therefore, while the seedling is being transported by the seedling holder 32a,
The tips of the seedling retaining claws 32j... Largely penetrate the seedling bed of the seedlings held in the seedling holding parts 32i.

When the seedling holder 32a moves to the lower end of the movement locus, the roller 32n "hits the lower cam plate 32q to push down the operation arm 32n, and the claw rotating arm 3
2m are forcibly rotated, and the seedling retaining claws 32j are retracted from the bottom of the seedling holding portions 32i.
3 prevents the seedling retaining claws 32j from becoming resistant to the seedling extracting action.

When the seedlings are extracted from the seedling holding portions 32i and the returning operation of the seedling holder 32a to the upper end of the movement locus is started, the seedling retaining claws 32j return to the state of protruding into the seedling holding portions 32i. The timing is returned until the seedling retaining claw 32j passes above the front end of the seedling feed belts 34a and 34a, and the seedling holder is retracted from the bottom of the seedling holding portions 32i as shown by a chain line in FIG. The lower part of the seedling retaining claws 32j projecting slightly (about 3 mm) below the bottom surface of the seedling 32a does not catch the seedlings on the seedling feeding belts 34a of the second seedling transporting device 34 described later.

The second seedling removal device 33 includes a seedling holder 32a.
Is moved to the seedling removal position Q, the seedling holder 32a
Of the seedlings held in each of the seedling holding portions 32i.
This is a device which is extracted at 3a and dropped on the seedling feed belts 34a of the second seedling transport device 33. Seedling removal tool 33a
Are formed in a comb shape, and are provided so as to receive the seedlings held in the seedling holding portions 32i... Of the seedling holder 32a that has moved to the seedling removal position Q, and to extract the seedlings by passing only the seedling holders 32a. ing. Seedling removal tool 33
a is provided so as to move up and down by a cam disk 33b attached to the left projecting portion of the common drive shaft 31b so as to rotate integrally therewith. That is, the base of the seedling removal tool 33a is integrally attached to the rotation arm 33c via the connecting member, and the rotation arm is rotatably attached to the rotation shaft 33d. A pin 33e is fixed to the rotating arm 33c,
Further, a spring 33f for urging the pin 33e to contact the cam surface of the cam disc 33b is
c. As a result, immediately after the seedlings are removed from the seedling holders 32a, the seedling removal tool 33a is moved downward by the cam mechanism and operates to forcibly drop the seedlings onto the seedling feeding belts 34a.

The second seedling transfer device 34 includes a second seedling removal device 3.
The seedlings for one row in a row that have been pulled out by 3
This is a device that receives the seedlings 4a and 34a and conveys them to the seedling picking positions S and S of the left and right seedling planting devices 35 and 35 in left and right halves. The second seedling transfer device 34 includes a drive roller shaft 34 that projects to the rear side of the planting transmission case 16 and rotates in opposite directions.
b and 34b are connected to drive rollers 34c and 34c so as to rotate integrally with each other. A seedling feed belt 34a and 34a is wound around the drive roller and driven rollers 34d and 34d rotatably supported on the left and right inner sides. Seedling feed belt 34
The upper surfaces of the a and 34a move to the left and right outer sides, respectively. A plurality of rows of projections 34a 'are arranged on the outer peripheral surface of the seedling feed belt 34a along the moving direction, and the floor of the seedlings N is sandwiched between the left and right of the projections 34a'. Conveyed.

The operation of the seedling feeding belts 34a, 34a is such that the seedlings are conveyed to the seedling picking position in synchronization with the timing at which the seedling planting devices 35 pick up seedlings one by one from the seedling picking positions SS. When the seedling holder 32a is near the seedling removal position Q, the operation speed of the seedling feeding belts 34a is reduced. The mechanism will be described later. For this reason, one row of seedlings dropped from the seedling holder 32a is reliably placed on the appropriate position of the seedling feeding belts 34a. Therefore, the height of the projections 34a 'can be increased because the seedlings dropped from the seedling holder 32a may not be misaligned by hitting the projections 34a'. As a result, the position of the seedling being transported is stabilized, and the seedling is removed from the seedling collection position
Can be supplied at the appropriate timing.

The seedling planting device 35 is a device for taking the seedlings conveyed to the seedling collecting positions SS by the second seedling conveying device 34 one by one and planting them in a field. The seedling planting device 35 includes a left and right transmission frame 16 fixed to a side surface of the planting transmission case 16.
The rotating case 35b is attached to the rear left and right side portions of the planting transmission frames 16b and 16b extending rearward from a, and is internally provided with a cam body fixed non-rotatably, and the case side rotates integrally with the planting drive shaft 35a. Seedling implantation rod 35c / 35 for body
c. Two seedling implantation rods 35c
The tip of 35c moves in a closed loop trajectory T to alternately plant seedlings in the field.

The seedlings N of the seedling feed belts 34a of the second seedling transfer device 34 are located at the end of the belt and have a seedling picking position S.
It is dropped into the seedling receiving portions 35d provided in S.
The seedling receiving portions 35d, 35d are formed above plate-shaped planting guides 35e, 35e, 35e, 35e arranged on the left and right.
… To receive it. Seedling receiving part 35d ・ 3
The seedling received at 5d is received at the tip of the seedling transplanting rods 35b and 35b moving from above, and the planting guide 35
e and 35e, and the seedlings are planted in the field.

Next, the transmission mechanism of the planting section 4 will be described. Transmission shaft 9c from transmission case 9 of traveling vehicle body 2
Power is input to an input shaft 42 ′ provided at an input portion of the left and right transmission case 42 via the like. The power is transmitted from the input shaft 42 'to the planting transmission shaft 42a via bevel gears 42'a and 42'a, and is transmitted to the transmission mechanism in the planting transmission case 16 and the planting transmission frame 43 of each strip. Planting transmission case 1
.. Within the planting transmission shaft 42a, the gear 42b, the gear 4
4a, and transmitted to the common drive shaft 31b via the clutch 45b. The push-out drive arm 31c and the cam disk 33b are attached to the left end of the common drive shaft 31b, and the swing drive arm 32c is attached to the right end of the common drive shaft 31b. A seedling box feed cam 45c is mounted on the common drive shaft 31b so as to rotate integrally with the common drive shaft 31b, and a roller 46a of an arm 46 assembled so as to rotate integrally with the seedling box feed drive shaft 40c contacts the cam. Feed drive shaft 4
0c is rotated. 45b ′...
This is a clutch actuation pin for turning on and off b.

Further, the transmission 42a is connected to the gear 42c.
48 to the seedling feed belt drive shaft 47 through the seedling feed belt drive shaft 47, and bevel gears 47b.
The drive roller shaft 34b of the second seedling transfer device 34 via
・ Transmits to 34b ... The pair of gears 42c and 47a
Is an elliptical gear to change the rotation speed of the seedling feed belt drive shaft 47 so that the operating speed of the seedling feed belts 34a is reduced when the seedling holder 32a is located near the lower end of the movement locus. The gears 42c and 47a may be eccentric gears. Furthermore, the transmission is transmitted from the planting transmission shaft 42a to the planting drive shafts 35a via the sprockets 42d, chains 42e, and sprockets on the planting device side to drive the seedling planting devices 35.

[0033]

As described above, the seedling transplanter according to the present invention is configured so that the operation speed of the seedling feed belt is slow when the seedling holder is near the seedling removal position. One row of seedlings that are dropped from the seedlings are securely placed on the seedling feed belt at an appropriate position, and the height of protrusions for determining the position of the seedlings on the seedling feed belt can be increased, so that the seedlings being transported Position is stable,
The seedlings can be supplied to the seedling collecting position of the seedling planting device at an appropriate timing, and the planting accuracy of the seedlings has been improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a seedling transplanter.

FIG. 2 is a left side view showing a part of the planting portion.

FIG. 3 is a right side view showing a part of the planting portion.

FIG. 4 is a rear view showing a part of the planting portion.

FIG. 5 is a partial cross-sectional front view of a seedling holder.

FIG. 6 is a sectional view taken along line S1-S1 of FIG.

FIG. 7 is a sectional view taken along line S2-S2 of FIG.

FIG. 8 is a sectional view of a transmission mechanism of the planting section.

FIG. 9 is a plan view of a seedling box.

FIG. 10A is a side view and a front view of a seedling box.

[Explanation of symbols]

 C Seedling box 1 Seedling transplanter 2 Running car body 3 Link device 4 Planting unit 30 Seedling box transfer device 31 First seedling removal device 32 First seedling transfer device 32a Seedling holder 33 Second seedling removal device 33a Seedling removal tool 34 Second Seedling transfer device 34a Seedling feed belt 35 Seedling planting device

Claims (1)

[Claims] 1. A seedling holder for receiving a row of seedlings taken from each pot of a seedling box in which a large number of pots accommodating seedlings one by one are arranged vertically and horizontally and moving downward while holding the seedlings, When the seedling holder has moved to a predetermined seedling removal position, a seedling removal tool that takes out one row of seedlings from the seedling holder, and receives one row of seedlings taken out of the seedling holder by the seedling removal tool at the lower side, A seedling transfer belt for placing seedlings thereon and transporting the seedlings in the direction in which the seedlings are arranged to the seedling picking position of the seedling planting apparatus, wherein when the seedling holder is near the seedling removal position, the seedling feeding belt is activated. A seedling transplanter characterized in that the speed is reduced.