JPH05115208A - Rolling attitude controller in rice transplanter - Google Patents

Abstract

PURPOSE:To simply control the rolling of a seedling planter in a field by reciprocatively driving a rolling-controlling motor in response to the rolling of the seedling planter in the field in connection with the floats on both the sides of the seedling planter. CONSTITUTION:A rolling-controlling motor 48 for controlling the rolling of a seedling planter is disposed in a traveling frame. The motor 48 is related with the floats on both the sides of the seedling planter, and the seedling planter is rolled so that, when the float on the right side is raised, the seedling planter lifts the float on the right side and so that, when the float on the left side is raised, the seedling planter lifts the float on the left side. A rolling-controlling shaft 42 is disposed at a position having a height between a top link and a lower link.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic controller for a rolling posture in a seedling planting device for a riding type rice transplanter.

[0002]

2. Description of the Related Art Generally, a plurality of seedling planting devices for riding type rice transplanters are provided with a plurality of seedling planting mechanisms so as to plant a plurality of seedlings in a field scene at appropriate intervals to the left and right in the traveling direction of the traveling body. There are many. In this case, the depth of planting seedlings in the left and right positions of the seedling planting device must be constant.

However, the field scene where the float contacts the ground and the cultivator where the wheels of the traveling machine body contact the ground have unevenness, and the field scene and the cultivator are not always parallel. It will be rolling motion with respect to the field scene. When the seedling planting device rolls in this manner with respect to the field scene, the vertical height of the seedling planting device differs from that of the field scene at the left and right positions. Therefore, one of the planting depths at the left and right positions is deeper. However, the seedling planting depth was not constant such that the other plant became shallow, and the survival of seedlings was poor at locations where the planting depth was deep, and floating seedlings occurred at locations where the planting depth was shallow.

Accordingly, recently, the posture of the seedling planting apparatus with respect to a field scene is made substantially constant by mounting the seedling planting apparatus on a traveling machine body so that the seedling planting apparatus can be rolled and freely controlled by a hydraulic mechanism. It is suggested to keep.

[0005]

However, in order to perform rolling control by hydraulic pressure in this way, a hydraulic system independent of the raising / lowering operation of the seedling planting device is required. Since the structure must be provided individually, not only the structure is considerably complicated and considerably expensive, but also the weight is increased. Moreover, when the seedling planting device is configured to be detachable from the traveling machine body, It was necessary to connect and disconnect the hydraulic pipes at the same time when the device was attached and detached, which required a great deal of labor and skill, which was extremely difficult for an amateur.

According to the present invention, the rolling control for the seedling planting apparatus is performed by an electric motor associated with vertical movement of a pair of left and right side floats in the seedling planting apparatus. It was done.

[0007]

In order to achieve this object, the present invention is a rice planting system in which a traveling machine body is equipped with a seedling planting device having at least a pair of left and right side floats in a rollable and detachable manner. In the machine, the pair of left and right side floats are configured to be movable up and down with respect to the seedling planting device, and on the traveling machine body side, a motor for rolling the seedling planting device with respect to the traveling machine body. The motor and the both side floats are operated so that the motor rolls in the direction in which the right side float is lifted by the raising motion of the right side float, and the left side float raises the above. A motor was associated so that the seedling plant operated in a rolling motion in the direction of lifting its left side float.

[0008]

EXAMPLE An example in which the present invention is applied to a so-called post-planting type riding rice transplanter in which a seedling planting device is mounted on the rear portion of a traveling machine body will be described. In the drawings, reference numeral 1 denotes a traveling vehicle body, and the traveling vehicle body 1 is composed of a vehicle body frame 2 and two front wheels 3 attached to a lower surface of a front portion thereof and two rear wheels 5 attached to a lower surface of a rear portion thereof via a chain case 4. Becomes the body frame 2
The upper surface of the vehicle is provided with a control seat 6 and a steering handle 7, and is configured to travel by driving an engine 8 mounted on the upper surface of the front portion of the vehicle body frame 2.

Reference numeral 9 denotes a seedling planting device located at the rear portion of the traveling machine body 1. The seedling planting device 9 is a transmission case 10 and three planting cases which are attached laterally from the transmission case 10 at appropriate intervals. 11, a pair of left and right side floats 12a and 12b respectively mounted on the lower surface of each planting case 11, a central float 13, and a seedling stand 14 whose upper end is inclined so as to approach the traveling body 1, and each of the planting cases A vertical rocking type seedling planting mechanism 15 is provided at the rear end of 11.

The base ends of a pair of left and right lower links 16 are pivotally attached to the lower rear portion of the traveling body 1 and the base ends of one top link 17 are pivotably attached to the upper rear portion, respectively.
Between the top link 17 and the top link 17, a hydraulic cylinder 37 for moving the seedling planting device 9 up and down greatly is provided. A pair of upper and lower pin shafts 1 is provided between the joint plates 18 arranged on both left and right sides of the tip portions of the lower links 16 and the top link 17.
9 and 20, the top pin shaft 19 has the tip of the top link 17 pivotally attached thereto, and the lower pin shaft 20 has the tips of both lower links 16 pivotably attached thereto, and both joint plates 1
A pair of upper and lower hitch pins 21 and 22 are mounted between the eight, while the side surface of the transmission case 10 of the seedling planting device 9 facing the rear surface of the traveling machine body 1 has a rolling shaft at a position on the plane center line of the traveling machine body 1. The bracket plate 23 provided with 24 is attached, and the rolling shaft 24 in the bracket plate 23 is attached.
A hitch body 25 formed in a U-shape in a plane so as to be inserted between the joint plates 18 is rotatably fitted to the front side of the left and right side plates 26 of the hitch body 25. The downward hook part 27 that is hooked on the upper hitch pin 21
A recess 28 into which the lower hitch pin 22 can be fitted is provided in the lower portion, while a hitch shaft 29 is rotatably supported between the left and right side plates 26 of the hitch body 25 in parallel with both the hitch pins 21 and 22. A lever handle 30 is fixed to one end of the lever handle 30 to rotate the hitch shaft 29. The hitch shaft 29 between the side plates 26 is provided with an eccentric cam 31. Both eccentric cams 31
A hook lever 32, which is adapted to be hooked to the lower hitch pin 22, is rotatably fitted on the lower hitch pin 22.
2 are connected via a pipe 33 so that they can be simultaneously rotated, and a pin 34 protruding outward from one end of one hook lever 32 and a pin 35 protruding outward from the lever handle 30. A spring 36 is installed between the springs so that when the lever handle 30 is rotated toward the seedling planting device 9, both hook levers 32 are biased in a direction in which they are hooked to the lower hitch pin 22.

The floats 12a and 12b on both sides are also provided.
Is attached to a horizontal bar 38 mounted on the lower surface of each planting case 11 in a direction perpendicular to the traveling direction via link mechanisms 39a and 39b so that the front portion can freely move up and down. 39b has one end of each wire 40a, 40b for each side float 12a,
12b By the upward movement of the front part, both wires 40a, 4
Tie each so that 0b can be pulled.

A rolling control shaft 42 extending in a direction perpendicular to the traveling direction is axially slidably supported by a gear case 41 attached to the hitch body 25 on the traveling machine body 1 side so as to be slidable in the axial direction. Two protrusions 43a and 43b are fixed to the shaft 42, and both protrusions 43a and 43b are fixed.
Between the bracket plate 23 on the side of the seedling planting device 9
Insert the protruding piece 44 that integrally protrudes from the
Rolling control springs 45a and 45b are respectively inserted between both sides of each of the projections 43a and 43b, and the rolling control shaft 42 slides so that the seedling planting device 9 rolls with respect to the traveling body 1. To configure. Further, the rolling control shaft 42 in the gear case 41 is provided with a male screw portion 46 of a right screw, and a screw gear 47 is screwed to the male screw portion 46, and the screw gear 47 is attached to a side surface of the gear case 41. The reverse rotation type rolling control motor 48 rotates rightward to cause the rolling control shaft 42 to slide leftward as indicated by an arrow A, and the leftward rotation causes the rolling control shaft 42 to move toward an arrow B. It is configured to slide in the right direction shown.

On the other hand, a pin 50 is rotatably attached to the base end of a rolling sensor arm 49 on the traveling machine body 1 or the seedling planting device 9 and is slidable in a long groove 51 formed in the rolling sensor arm 49. The wire 52 connected to the both side floats 12a and 12b is connected to the engaging element 52 fitted to the
When the wire 40b of the right side float 12b is pulled, the rolling sensor arm 49 pivots to the right when the springs 57a and 57b at the other ends of a and 40b are pulled, and when the wire 40a of the left side float 12a is pulled, the rolling sensor arm 49 is rotated. The sensor arm 49 is engaged so as to rotate leftward. The rolling sensor arm 49 is provided on both sides of the rolling sensor arm 49.
Limit switches 53a, 53 that are turned on by contact with
b is provided, and both limit switches 53a and 53b are
In the electrical circuit 54 to the rolling control motor 48,
When the left limit switch 53a is turned on, the rolling control motor 48 drives the screw gear 47 to rotate in the left direction,
When the right limit switch 53b is turned on, the rolling control motor 48 is inserted so as to drive the screw gear 47 to rotate in the right direction.

Reference numerals 56a and 56b denote restoring springs for rolling, and the spring forces of the rolling restoring springs 56a and 56b are smaller than those of the rolling controlling springs 45a and 45b. In this configuration, when the seedling planting device 9 does not roll with respect to the field scene 55, that is, when the left and right sides of the seedling planting device 9 are at predetermined height positions with respect to the field scene 55, both side floats 12a,
Since neither 12b moves upward, the rolling sensor arm 49 interlocked with the 12b via the respective wires 40a, 40b is in the neutral position where it does not rotate in either the left or right direction, and both limit switches 53a, 53b are Therefore, the rolling control motor 48 remains stopped and rolling control by the rolling control motor 48 is not performed, but the field scene 55 of the seedling planting device 9 is not performed.
When the seedling planting device 9 is tilted so that its left side is lowered by rolling, the rolling sensor arm 49 is rotated leftward and the left limit switch 53a is turned on by the ascending movement of the left side float 12a. , The rolling control motor 48 moves the rolling control shaft 42 to the eighth position.
Since it is rotationally driven so as to slide to the right as shown by arrow B in the figure, the inclination of the seedling planting device 9 to the left is corrected by this, and the right side of the seedling planting device 9 is lowered. If it is inclined like this, as the right side float 12b moves upward, the rolling sensor arm 49 rotates to the right and the right limit switch 53b turns on, so that the rolling control motor 48 moves the rolling control shaft 42 to the position shown in FIG. Since it is rotationally driven so as to slide leftward as indicated by arrow A, the inclination of the seedling planting device 9 to the right is corrected accordingly.

As a result, the rolling of the seedling planting device 9 with respect to the field scene 55 is automatically controlled so that the height with respect to the field scene 55 at the left and right positions of the seedling planting device 9 is always substantially constant, and the seedling planting depth is increased. However, seedlings can be planted at a substantially constant depth without deepening on the one hand and shallowing on the other. If the bracket 58 that supports the pivot pin 50 of the rolling sensor arm 49 is movably attached to the traveling machine body 1 or the seedling planting device 9 in the longitudinal direction of the rolling sensor arm 49, the movement of the bracket 58 can be performed. The sensitivity of the automatic control can be adjusted.

[0016]

According to the present invention, the rolling control motor for rolling the seedling planting device with respect to the traveling machine body as described above is related to the float on both sides, and the rolling control is performed according to the rolling on the field scene. Since the motor is automatically controlled so as to correct the rolling of the seedling planting device in the field by reversing the motor, the structure does not become remarkably complicated unlike the conventional hydraulic system. Is simple and lightweight, and can be provided at low cost.

Moreover, when the seedling planting device is attached to or detached from the traveling machine body, it is sufficient to connect and disconnect the electric wiring from the power source such as the battery on the traveling machine body side to the rolling control motor, as in the conventional case. Connect hydraulic piping
Since it does not require the labor and skill to separate the seedlings, there is an effect that the operation of attaching and detaching the seedling planting device can be performed extremely easily and quickly.

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

FIG. 5 is a vertical sectional front view of a connecting portion between the traveling machine body and the seedling planting device.

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

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

FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a diagram showing a relationship between a rolling sensor arm and a limit switch.

[Explanation of symbols]

 1 traveling machine body 9 seedling planting device 12a, 12b side float 42 rolling control shaft 48 rolling control motor 49 rolling sensor arm 53a, 53b limit switch 40a, 40b wire

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[Procedure amendment]

[Submission date] May 19, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Rolling posture control device in rice transplanter

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic controller for a rolling posture in a seedling planting device for a riding type rice transplanter.

[0002]

2. Description of the Related Art Generally, a seedling planting device for a riding type rice transplanter is equipped with
It is often the case that a plurality of seedling planting mechanisms are installed in parallel so that seedlings can be planted along multiple rows in a field scene at appropriate intervals on the left and right in the traveling direction of the traveling body. In this case, the depth of planting seedlings in the left and right positions of the seedling planting device must be constant.

However, the field scene where the float contacts the ground and the cultivator where the wheels of the traveling machine body contact the ground have unevenness, and the field scene and the cultivator are not always parallel. It will be rolling motion with respect to the field scene. When the seedling planting device rolls in this manner with respect to the field scene, the vertical height of the seedling planting device differs from that of the field scene at the left and right positions. Therefore, one of the planting depths at the left and right positions is deeper. However, the seedling planting depth was not constant such that the other plant became shallow, and the survival of seedlings was poor at locations where the planting depth was deep, and floating seedlings occurred at locations where the planting depth was shallow.

[0004] Therefore, as a prior art, the actual development Sho 58-9
No. 4313 discloses that the seedling planting device is mounted on the rear ends of the top link and the lower link extending rearward from the traveling machine body so that the seedling planting device can be rolled about a rolling shaft extending in the front-rear direction. The motor is configured to roll, while the left and right side floats in the seedling planting device and the motor are moved in a direction in which the motor raises the seedling planting device when one side float moves upward. When the rolling motion is made and the other side float moves upward, the motor is operated so as to make the seedling plant move in a rolling motion in the direction of lifting the other side float. Proposes to keep it constant.

[0005]

However, according to the prior art, the seedling planting device rolls with respect to the traveling machine only when one of the two side floats moves upward. However, since the width of the control is narrow, the seedling planting device can be accurately controlled according to the unevenness in the field, instead of rolling the seedling planting device according to the downward movement of the one side float. There was a problem that rolling control was not possible.

In addition, in the prior art, the rolling shaft, which is the center of the rolling motion in the seedling planting device, is abbreviated as a lower link among the top link and the lower link for connecting the seedling planting device to the traveling body. Since the distance from the rolling shaft to the floats on both sides is short and the floats on both sides move up to a certain height, the seedlings follow the same because they are arranged at the same height. There is also a problem that the rolling control sensitivity is low because the rotation angle when rolling the planting device to a state substantially parallel to the field scene becomes large.

The present invention aims to solve these problems.

[0008]

In order to achieve this object, the present invention provides a seedling planting device having at least a pair of left and right side floats at the rear ends of a top link and a lower link extending rearward from a traveling machine body, In a rice transplanter mounted so as to be rotatable around a rolling shaft extending in the front-rear direction of the traveling machine body, the pair of left and right side floats are configured to freely move up and down independently of the seedling planting device. On the other hand, on the traveling machine body side, a motor for rolling the seedling planting device with respect to the traveling machine body is provided, and the motor and the both side floats are provided in a height difference between both side floats. Accordingly, the motor is operatively associated to cause the seedling planting device to roll in a direction that eliminates the height difference between the two side floats. The ring axis, while disposed at the site of the height between the said top link and lower link,
The floats on both sides are located outside the left and right sides of the seedling planting device.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. In the figure, reference numeral 1 indicates a traveling machine body, and the traveling machine body 1
Is the vehicle body frame 2 and the two front wheels 3 attached to the lower surface of the front portion thereof.
And the rear two wheels 5 attached to the lower surface of the rear through the chain case 4.
And a control seat 6 on the upper surface of the body frame 2.
And a steering handle 7, and is configured to run by driving an engine 8 mounted on the front upper surface of the body frame 2.

Reference numeral 9 indicates a seedling planting device located at the rear portion of the traveling machine body 1. The seedling planting device 9 includes a transmission case 10 and
Three planting cases 11 mounted laterally at appropriate intervals from the transmission case 10, and a pair of left and right side floats 12a and 12b mounted on the lower surface of each planting case 11,
It comprises a central float 13 and a seedling stand 14 whose upper end is inclined so as to approach the traveling body 1, and a vertical swinging type seedling planting mechanism 15 is provided at the rear end of each planting case 11. There is.

The base ends of a pair of left and right lower links 16 are pivotally attached to the lower rear portion of the traveling body 1 and the base ends of a single top link 17 are pivotably attached to the upper rear portion.
Between the top link 17 and the top link 17, a hydraulic cylinder 37 for moving the seedling planting device 9 up and down greatly is provided. A pair of upper and lower pin shafts 1 is provided between the joint plates 18 arranged on both left and right sides of the tip portions of the lower links 16 and the top link 17.
9 and 20, the top pin shaft 19 has the tip of the top link 17 pivotally attached thereto, and the lower pin shaft 20 has the tips of both lower links 16 pivotably attached thereto, and both joint plates 1
A pair of upper and lower hitch pins 21 and 22 are mounted between the eight, while the side surface of the transmission case 10 of the seedling planting device 9 facing the rear surface of the traveling machine body 1 has a rolling shaft at a position on the plane center line of the traveling machine body 1. A bracket plate 23 provided with 24,
The bracket plate 23 is attached so that the rolling shaft 24 is located at a position at a height approximately midway between the lower link 16 and the top link 17, and the bracket plate 2
Hitch body 25 formed in a U-shape in a plane so as to be inserted between the joint plates 18 on the rolling shaft 24 in FIG.
Is rotatably fitted to the left and right side plates 26 of the hitch body 25, and a downward hook portion 27 for catching the upper hitch pin 21 is provided on the upper portion and a lower hitch pin 22 is provided on the lower portion.
While each of the recesses 28 into which the hitches can be fitted is provided, the hitch body 25
Between the left and right side plates 26, a hitch shaft 29 is attached to both hitch pins 2
The lever handle 30 is fixed to one end of the hitch shaft 29 so that the hitch shaft 29 can be rotated by the lever handle 30, and both side plates 26 The hitch shaft 29 between the eccentric cam 31
A hook lever 32 adapted to be hooked on the lower hitch pin 22 is rotatably fitted to both of the eccentric cams 31, and both hook levers 32 can be simultaneously rotated through a pipe 33. Connect, one hook lever 3
Between the pin 34 projecting outward from one end of 2 and the pin 35 projecting outward from the lever handle 30, both hook levers when the lever handle 30 is rotated toward the seedling planting device 9 side. A spring 36 is mounted to bias the lower hitch pin 22 toward the lower hitch pin 22.

The floats 12a, 12b on both sides are
Is attached to a horizontal bar 38 mounted on the lower surface of each planting case 11 in a direction perpendicular to the traveling direction via link mechanisms 39a and 39b so that the front portion can freely move up and down. 39b has one end of each wire 40a, 40b for each side float 12a,
12b By the upward movement of the front part, both wires 40a, 4
Tie each so that 0b can be pulled.

A rolling control shaft 42 extending in a direction perpendicular to the traveling direction is slidably supported in the axial direction in a gear case 41 attached to the hitch body 25 on the traveling machine body 1 side, and the rolling control is performed. Two protrusions 43a and 43b are fixed to the shaft 42, and both protrusions 43a and 43b are fixed.
Between the bracket plate 23 on the side of the seedling planting device 9
Insert the protruding piece 44 that integrally protrudes from the
Rolling control springs 45a and 45b are respectively inserted between both sides of each of the projections 43a and 43b, and the rolling control shaft 42 slides so that the seedling planting device 9 rolls with respect to the traveling body 1. To configure.

The rolling control shaft 42 in the gear case 41 is provided with a male screw portion 46 of a right screw, and a screw gear 47 is screwed into the male screw portion 46, and the screw gear 47 is
When the forward / reverse rotation type rolling control motor 48 mounted on the side surface of the gear case 41 rotates to the right, the rolling control shaft 42 slides to the left as indicated by the arrow A and rotates to the left. The rolling control shaft 42 is configured to slide rightward as indicated by arrow B.

On the other hand, a pin 50 is rotatably attached to the base end of a rolling sensor arm 49 on the traveling machine body 1 or the seedling planting device 9, and is slidable in a long groove 51 formed in the rolling sensor arm 49. The wire 52 connected to the both side floats 12a and 12b is connected to the engaging element 52 fitted to the
When the wire 40b of the right side float 12b is pulled, the rolling sensor arm 49 pivots to the right when the springs 57a and 57b at the other ends of a and 40b are pulled, and when the wire 40a of the left side float 12a is pulled, the rolling sensor arm 49 is rotated. The sensor arm 49 is engaged so as to rotate leftward.

Then, the rolling sensor arm 4
On both sides of 9, the limit switches 53a and 53b which are turned on by the contact of the rolling sensor arm 49 are arranged, and the limit switches 53a and 53b are arranged in the electric circuit 54 to the rolling control motor 48. Rolling control motor 4 when left limit switch 53a is ON
8 drives the screw gear 47 to rotate leftward, and when the right limit switch 53b is turned on, the rolling control motor 4 is rotated.
A screw gear 47 is inserted so as to drive-rotate the screw gear 47 in the direction of clockwise rotation.

Reference numerals 56a and 56b denote restoring springs for rolling, and the spring force of the rolling restoring springs 56a and 56b is smaller than that of the rolling controlling springs 45a and 45b. In this configuration, when the seedling planting device 9 does not roll with respect to the field scene 55, that is, when the left and right sides of the seedling planting device 9 are at predetermined height positions with respect to the field scene 55, both side floats 12a,
Since neither 12b moves upward, the rolling sensor arm 49 interlocked with the 12b via the respective wires 40a, 40b is in the neutral position where it does not rotate in either the left or right direction, and both limit switches 53a, 53b are Therefore, the rolling control motor 48 remains stopped, and the rolling control motor 48 does not perform the rolling control.

Next, by rolling the seedling planting device 9 with respect to the farm scene 55, the seedling planting device 9 is inclined so that its left side is lowered with respect to the farm scene 55, so that the floats 12a and 12b are sandwiched between the side floats 12a and 12b. When there is a difference in elevation, the rolling sensor arm 49 is pulled leftward by the wire 40a by the ascending movement of the left side float 12a, while the descending movement of the right side float 12b causes the wire 40b to move relative to the rolling sensor arm 49. Since the pulling in the right direction will be loosened, the rolling sensor arm 49 is attached to both side floats 12a and 12b.
The left limit switch 53a is turned on by rotating to the left due to the difference in height. Then, the rolling control motor 4
8, the rolling control shaft 42 is rotationally driven so as to slide rightward as shown by an arrow B in FIG. 8, so that the inclination of the seedling planting device 9 to the left is corrected.

When the seedling planting device 9 is inclined so that its right side is lowered with respect to the field scene 55, a height difference is created between the floats 12a and 12b on both sides, and the float 12b on the right side is moved upward. At this time, while pulling the rolling sensor arm 49 to the right with the wire 40b, the pulling of the wire 40a to the left with respect to the rolling sensor arm 49 is loosened by the downward movement of the left side float 12a. The rolling sensor arm 49 has floats 12a and 12b on both sides.
The right limit switch 53b is turned on by rotating in the right direction due to the difference in height. Then, the rolling control motor 4
8, the rolling control shaft 42 is rotationally driven so as to slide leftward as shown by an arrow A in FIG. 8, so that the inclination of the seedling planting device 9 to the right is corrected.

As a result, the rolling of the seedling planting device 9 with respect to the field scene 55 is automatically controlled so that the height between the seedling planting device 9 and the field scene 55 at the left and right positions is always substantially constant, and the seedling planting depth is increased. However, the seedlings can be planted at a substantially constant depth without becoming deep on the one hand and shallow on the other. If the bracket 58 that supports the pivot pin 50 of the rolling sensor arm 49 is movably attached to the traveling machine body 1 or the seedling planting device 9 in the longitudinal direction of the rolling sensor arm 49, the movement of the bracket 58 can be performed. The sensitivity of the automatic control can be adjusted.

[0021]

According to the present invention, the rolling control motor for rolling the seedling planting device with respect to the traveling machine body as described above is provided with respect to the floats on both sides and the difference in height difference between the floats on both sides. According to the above, the motor is configured so as to operate so as to cause the seedling planting device to roll so as to eliminate the height difference between the two side floats. The rolling control can be performed by the vertical movement of both side floats, and the width of the control can be greatly increased as compared with the prior art related to only the upward movement of both side floats. The device can be precisely controlled for rolling according to the unevenness in the field scene.

Further, according to the present invention, the rolling shaft is disposed at a height between the top link and the lower link without being positioned at substantially the same height as the lower link, while the both side floats are By being located on the left and right outer sides of the seedling planting device, the distance from the rolling shaft to both side floats becomes long, and when the both side floats move up and down by a certain height, the seedling planting device is tracked accordingly. Since the rotation angle when rolling to a state substantially parallel to the surface is smaller than in the case of the above-mentioned prior art, there is also an effect that the sensitivity of rolling control can be greatly improved.

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

FIG. 5 is a vertical sectional front view of a connecting portion between the traveling machine body and the seedling planting device.

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

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

FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a diagram showing a relationship between a rolling sensor arm and a limit switch.

[Explanation of reference numerals] 1 traveling machine body 9 seedling planting device 12a, 12b side float 42 rolling control shaft 48 rolling control motor 49 rolling sensor arm 53a, 53b limit switch 40a, 40b wire

Claims (1)

[Claims] 1. A rice transplanter in which a traveling machine body is equipped with at least a pair of left and right side floats so that the pair of left and right side floats can be rolled and detachably mounted. While being configured to be vertically movable with respect to the device, a motor for rolling the seedling planting device with respect to the traveling machine body is provided on the traveling machine body side,
The motor and the both side floats are operated so that the motor rolls the seedling planting device in a direction of lifting the right side float by the rising motion of the right side float, and the motor is operated by the rising motion of the left side float. A rolling posture control device in a rice transplanter, which is related to operate the planting device so as to make a rolling motion in a direction of lifting a left side float thereof.