JPS6128312A - Rice planter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] C. Industrial application field] The present invention is an LJ that attaches a planting part to a traveling machine so that it can be raised and lowered.
Regarding rice transplanters.

[Prior art]

Rice transplanters plant strains in rows at predetermined intervals, but recent rice transplanters are designed to maintain a constant planting depth regardless of the unevenness of the field. FIG. 8 schematically shows the main parts of such a rice transplanter. In the regular rice transplanter, the planting part is attached to the traveling body so that it can be raised and lowered by a lifting device, and the float 21 in the planting part is
The float 21 is attached to the seedling planting device 37 so as to be rotatable in the vertical direction relative to the seedling planting device 37, etc., and the float 21 is rotated in the vertical direction with respect to the seedling planting device 37 due to unevenness of the field surface. The planting section can be raised and lowered by

That is, a rotation rod 23 extending in the left-right direction is attached to the seedling planting device 37, and the base end of a connecting rod 24 extending rearward and downward is fixed to the rotation rod 23, and the tip end thereof is fixed to the rotation rod 23. is pivotally supported at the rear of the float 21 by a pin 24a. In addition, the rotating rod 23 has a first link arm 25 extending forward.
The base end portion of the second link arm 26 is fixedly fixed, and the lower end portion of a second link arm 26 extending in the vertical direction is pivotally supported at the distal end portion of the second link arm 26. The third link arm 27 is pivotally supported at the rear end of the third link arm 27 . The front end of the third link arm 27 is connected to a seedling planting device 37.
The front end of the third link arm 27 is integrally attached to the rear end of a link element 29 extending in the front-rear direction. The front end portion is slidably locked by a connecting shaft 31 into an elongated hole 30a formed in the middle of a connecting tool 30 whose lower end is pivotally supported at the tip of the float 21. One end of a wire 32 is attached to the front end of the link element 29.

Furthermore, one end of a sleeve 33 that is fitted around the wire 32 is fixed to the upper end of the connector 30 that is pivotally supported at the tip of the float 21 . The other end of the sleeve 33 is attached to the starting point of the traveling machine, and the other end of the wire 32 fitted in the sleeve 33 extends from the other end of the sleeve 33 and is connected to a hydraulic cylinder for raising and lowering the planting section. It is locked to a control rod 34 of a hydraulic valve 40 that controls the supply and discharge of pressure oil to and from the hydraulic valve 40.

With this configuration, the float 21 can rotate around the bin 24a, and when the tip of the float 21 is rotated upward (or downward), the sleeve 33 is pushed (or pulled) upward (or downward). Flow I.2
The wire 32 attached to the seedling planting device 37, which does not change its position with respect to the rotation of 1, is pulled (or pressed) relatively downward (or upward), and the operating rod 34 is moved backward (or forward).
The hydraulic valve 40 is operated, the entire planting section is raised (or lowered), and the float 21 is controlled to be in a substantially horizontal state by the pressure from the field surface.

In the conventional rice transplanter having such a configuration, when the traveling body itself enters a front up (or front down) state, the planting section also follows the traveling machine and enters a front up (or front down) state.

However, since the flow 1-21 follows the field surface and is in a substantially horizontal state, the seedling planting device 37 is in a forward up (or forward down) state even though the float 21 is in a horizontal state, and the float 2 The wire 32 is pressed (or pulled) in the same state as when the plant is lowered (or raised), the planting part is lowered (or raised), and the float 21 is therefore lowered (or raised).

The phenomenon in this case will be explained in more detail. Now, if the traveling body is moving forward upward, it is positive; if it is moving forward, it is negative; if the float 21 is forward upward relative to the seedling planting device 37, it is positive; if it is forward downward, it is positive. is negative, and the operating position of the hydraulic valve 40 for each angle is shown in the graph of FIG.

As mentioned above, the hydraulic valve 40 operates when the float 21 is out of the predetermined range (0.5' to 1') with respect to the seedling planting device 37, regardless of the tilting of the traveling body in the longitudinal direction. Therefore, when the traveling body moves forward (for example, 3") and the seedling planting device also becomes forward upward, the float 2
1, in order to maintain a substantially horizontal state, the relative angle between the seedling planting device 37 and the float 21 is the same as the tilt of the traveling machine (-3°).
(See Figure 9, Kōjumaru). For this reason, the hydraulic valve 40
operates to lower the planting part, and the planting part descends, but in this case, the forward tilting of the traveling aircraft involves rotating around the grounding point of the rear wheels, so the front of the traveling aircraft The float 21 is pressed against the rice field due to the upward tilt, and the float 21 is further pressed and sinks as the planting part descends, resulting in buried seedlings that are planted at a deeper depth.

On the other hand, when the traveling body is tilted forward and downward, a phenomenon opposite to the above explanation occurs, and the float is separated from the rice field surface, resulting in floating seedlings where the seedlings cannot be reliably planted on the rice field surface.

In particular, in multi-row rice transplanters, the weight of the planting section is increased, which tends to cause the above-mentioned front-up condition, and providing a member for II control in the planting section further This increases the weight of the attachment part and has the disadvantage that it is troublesome to attach and detach the traveling body and the planting part.

〔the purpose〕

The present invention was made in view of the above circumstances, and its purpose is to prevent the possibility of burying or floating seedlings even if the traveling body is tilted in the front-back direction, and to prevent the planting part from being buried or floating. The objective is to provide a rice transplanter that stabilizes the weight balance without adding unnecessary weight.

〔composition〕

The present invention includes a seedling planting device for planting seedlings on a rice field, and a planting section having a float attached to the seedling planting device so as to be swingable in the vertical direction, which is attached to the traveling machine so as to be movable up and down. In a rice transplanter, in order to change the relative rocking position of the seedling planting device and the float and the lifting device that controls the raising and lowering of the planting portion based on the relative rocking position of the seedling planting device and the float in the planting portion. It is equipped with a position change device that operates, and a horizontal sensor that is installed in a portion where the posture in the longitudinal direction with respect to the horizontal changes due to the operation of the position change device and detects the posture in the longitudinal direction with respect to the horizontal. The position changing device is operated based on the position change device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a partially cutaway left side view of a riding rice transplanter according to the present invention. In the figure, A is a traveling body supported by the front end 14 and rear wheels 15, and B is a planting part attached to the three-point link mechanism 11 at the rear of the traveling body A.
The entire planting section B is raised and lowered by the raising and lowering of.

The planting section B includes a seedling platform 22 attached to the upper side of the seedling planting device 37 attached to the three-point linkage mechanism 11 at the rear of the traveling body A, and a seedling platform 22 attached to the lower side of the seedling planting device 37. It consists of three flows I/21 that are attached so that they can swing freely in the directions.

FIG. 2 is a plan view of the center and left floats 21, FIG. 3 is a schematic front view of the center float 21, and FIG. 4 is a schematic diagram of essential parts of the machine of the present invention shown together with a side view thereof. Each float 21 is attached to one rotating rod 23 that is pivotally supported at the bottom of the seedling planting device 37 and extends in the left-right direction. That is, the base end portions of a pair of left and right connecting rods 24 extending rearward and downward are fixed to the center, left, and right sides of the rotation rod 23, and the tip portions of the connecting rods 24 are attached to pins 24a on the upper surface of each float 21. It is rotatably mounted. Therefore, each float 21 is raised and lowered relative to the seedling planting device 37 by the rotation of the turning rod 23, and the planting depth of the seedlings is changed and adjusted. A base end portion of an adjustment lever 38 extending forward and upward is fixed to a portion of the rotation rod 23 corresponding to the center float 21 and the left float 21.
The rotation rod 23 is rotated by the rotation operation, and the seedling planting device 3
7, all the floats 21 are raised and lowered.

A base end of a first link arm 25 extending forward is fixed to the left side of the center of the rotation rod 23, and a second link arm 26 extending vertically is attached to the distal end of the first link arm 25.
The lower end of the link arm 26 is pivotally supported, and the second link arm 26
The upper end portion is pivotally supported by the rear end portion of a third link arm 27 extending in the front-rear direction.

The left end of a support shaft 28 that extends in the left-right direction and is integrally attached to the seedling planting device 37 is rotatably attached to the front end of the third link arm 27. Axis 2
8, rear end portions of a pair of left and right link elements 29, which are integral with a third link arm 27 extending in the front-rear direction, are rotatably attached. The front end of each link element 29 is pivotally supported by the left and right ends of a single connecting shaft 31 extending in the left-right direction, and the connecting shaft 31 is
It has a downward U-shape when viewed from the front, and slides its left and right lower ends into elongated holes 30a extending in the vertical direction formed on the left and right sides of the connector 30, which is pivotally supported on the front upper surface of the float 21. freely engaged. Further, one end of a wire 32 is locked to the center portion of the connecting shaft 31 in the left-right direction, and the wire 32 passes through the upper part of the connecting tool 30 and is inserted into a sleeve 33 with one end fixed to the upper part of the connecting tool 30. It extends to the traveling aircraft A through the

With this configuration, the float 21 is carved into the seedling planting device 37 and can be rotated vertically around a pin 24a at the rear thereof, and when the front portion thereof is rotated upward or downward, the connecting tool 30 Although the sleeve 33 fixed to the sleeve 33 is pressed or pulled, since the connecting shaft 31 engaged with the long hole 30a of the connecting tool 30 is linked to the seedling planting device 37, its position is not changed, and therefore the sleeve 33 The wire 32 fitted therein is pulled or pressed relatively downward or upward.

The other end of the wire 32 passes through the upper center of the connector 30,
A hydraulic valve that is fitted into the sleeve 33 and routed to the traveling machine body until the beginning of the journey, and controls the supply and discharge of pressure oil to the hydraulic cylinder that raises and lowers the three-point link mechanism 11 at the rear of the traveling machine body A. 40 is locked to the upper end of the control rod 34. The control rod 34 is disposed such that the middle convex portion 34a is in contact with the spool 41 of the hydraulic valve 40, and the convex portion 34a
A slightly lower portion is rotatably supported by a bin 35. The spool 41 of the hydraulic valve 40 is
The control rod 34 is biased by a spring 42 in the advancing direction (the direction in which it is operated when the three-point linkage mechanism 11 is lowered), and a tension spring 36 is attached to the lower end of the control rod 34. The lower end of the M rod 34 is urged in a direction opposite to the direction in which the rod 34 is rotated by the tensile force of the wire 32. When the hydraulic valve 40 or the spool 41 of the hydraulic valve 40 advances, the three-point linkage mechanism 11 descends, and when it advances, it rises.

On the other hand, the traveling body A is provided with a sleeve position changing mechanism 50 that changes the relative position of the sleeve 33 with respect to the wire 32.

This sleeve position changing mechanism will be explained below. The upper end of an L-shaped seat 55 is pivotally supported at the end of the sleeve 33 on the side of the traveling machine body A. The catch seat 55 has a bent portion pivotally supported in relation to the traveling body A, and consists of a portion extending upward from the bent portion and a portion extending rearward, and the upper end portion of the connecting link 54 is pivotally supported at the rear end. has been done. Connecting link 54
The lower end of the mounting arm 53 is pivoted to the front end of the mounting arm 53. The mounting arm 53 includes a mounting portion 53a extending in the front-back direction;
A drive section 53 extending downward from the rear end of the mounting section 53a
b, and the upper part of the drive part 53b is pivotally supported at the beginning of the fuselage. A horizontal sensor 60, which will be described later, is attached to the upper surface of the attachment portion 53a.

The lower end of the drive unit 53b is pivotally supported by a block body 52, which has a thread groove formed on its outer periphery and is arranged so that its axial direction coincides with the moving direction of the wire 32. The screw punch 51 is externally fitted onto a shaft rod 51. The screw punch 51 is rotatably supported by a bracket 56 attached to the beginning of the machine body, and the output shaft of a motor 57 is connected to one end of the screw punch 51.

Therefore, by normal rotation (or reverse rotation) of the motor 57, the block body 52 is moved forward as indicated by the solid line (or broken line) and the white arrow in FIG. 4, and the front end of the mounting arm 53 is rotated upward (or downward). The connecting link 54 moves upward (or downward), the seat 55 is rotated, and the sleeve 33 is pulled (or pushed) forward (or backward). The mounting portion 53a of the mounting arm 53 is horizontal when the block body 52 is located at the center of the screw punch 51 in the axial direction. Screwdriver 5
A normally closed limit switch 58 whose operating rod faces the movement range of the block body 52 is attached to the bracket 56 to which the block body 52 is attached.
．． 59 are disposed at the rear and front movement limit positions of the block body 52, respectively.

FIG. 5 is a longitudinal sectional view of the horizontal sensor 60. The horizontal sensor 60 has a support shaft 62 installed in the left-right direction inside the casing 61, and a fan-shaped light shielding plate 63 hanging rotatably from the center of the support shaft 62.
Light-emitting diodes 64 and 65 are arranged on the left side of the vehicle at an appropriate distance apart in the front-rear direction. Phototransistors 66 and 67 are respectively disposed at the front and rear positions facing the light emitting diodes 64 and 65 on the right side of the casing 61, and when the horizontal sensor 60 is in a horizontal state, the light emitting diodes 64 When the light emitted from .65 is received by each phototransistor 66 and 67 and turned on, and the horizontal sensor 60 is tilted forward downward (or forward upward), the casing 61 is also tilted forward downward (or forward upward). However, since the light shielding plate 63 is vertical, the light emitted from the front (or rear) light emitting diode 64 (or 65) is blocked by the light shielding plate 63, and the light emitted from the phototransistor 66 (or 67) is blocked by the light shielding plate 63. ) is turned off.

FIG. 6 shows the electrical circuit of the present invention. In the figure, 71 is a battery whose negative electrode is connected to potia earth, and its positive electrode is connected to one end of a key switch 72, and the other end of the key switch 72 is used to transmit and cut off power to the planting section B. Common terminal 74d of changeover switch 74 via planting switch 73 that turns on and off in conjunction with engagement and disengagement of the planting clutch
, is connected to. The switching switcher 4 has three switching terminals, one of which terminals 74a determines the rotational state of the seedling planting device 37 and the float 21 in the planting section B, that is, the aforementioned motor 57, based on the detection result of the horizontal sensor 60. The other two terminals 74b and 74c are terminals that are connected to the common terminal 74d when the motor 57 is directly controlled manually. The terminal 74b is connected when the motor 57 is rotated in the normal direction, and the terminal 74c is connected when the motor 57 is rotated in the reverse direction.

The switching side terminal 74a of the changeover switch 74 is connected to the constant voltage circuit 7.
5, and is also connected to the excitation coil 81G of the electromagnetic relay 81 via the normally closed limit switch 59 and switch transistor 77, and is further connected to the excitation coil 81G of the electromagnetic relay 82 via the normally closed limit switch 58 and switch transistor 79. Connected to coil 82G.

The output of the constant voltage circuit 75 is given to a series circuit of light emitting diodes 64 and 65 arranged in a horizontal sensor 60 interposed between the resistor and body ground, and is also supplied via a phototransistor 66 and a resistor. The switch transistor 76 is further supplied with the phototransistor 6.
7 and a resistor to switch i/randisk 78.

Light emitting diode 64 (or 65
) is received by a phototransistor 66 (or 67), and the phototransistor 66 (or 67) is turned on by receiving the light and turned off when the light shielding plate 63 blocks the light. . The output of the phototransistor 66 (or 67) is connected to the switch transistor 76 (
or 78). The collector of the switch transistor 76 (or 78) is connected to the switch transistor 77 (or huff 9) interposed between the limit switch 59 (or 58) and the excitation coil 81C (or 82C) of the electromagnetic relay 81 (or 82). ), and when the phototransistor 66 (or 67) is turned on, the switch transistor 76 (or 78) is turned on, and the switch transistor 77 (or 79) is turned off. Conversely, when the phototransistor 66 (or 67) is turned off, the switch transistor 76 (or 78) is turned off.
The switch transistor 77 (or 79) is turned on and the exciting coil 81C (or 82C) is excited.

The electromagnetic relay 81 has a normally open contact 81a and a normally closed contact 81b, and the normally open contact 81a is connected to one terminal (
The normally closed contact 81b is interposed between the terminal (which is connected to the battery when the motor 57 rotates normally) and the planting switch 73, and the normally closed contact 81b is interposed between the same terminal of the motor 57 and the body ground. ing.

Similarly, the electromagnetic relay 82 has a normally open contact 82a and a normally closed contact 82b, and the normally open contact 82a is connected to the other terminal of the motor 57 (the terminal connected to the battery when reversing the motor 57). The normally closed contact 82b is interposed between the terminal of the motor 57 and the body ground.

Therefore, the exciting coil 81C (of the electromagnetic relay 81 (or 82))
Or 82C) is energized to open the normally open contact 81a (or 82a
) is closed, the normally closed contact 81b (or 82b) is opened, and the motor 57 rotates forward (or reversely).

In the machine of the present invention having such a configuration, the raising and lowering of the planting section is controlled as follows. When the planting section B is lowered so that its float 21 touches the rice field surface and the traveling body A is made to travel forward, the seedling planting device 37 of the planting section B is driven to perform the planting work. The aircraft A runs on the plowing platform, and the float 21 slides on the rice field.

Now, when the traveling body A is in a substantially horizontal state, when the float 21 follows the unevenness on the rice field and its front part moves in three directions (or downwards), it is attached to the connector 30 of the float 21. The sleeve 33 is pushed (or pulled) upward (or downward), the wire 32 fitted in the sleeve 33 is pulled (or pushed) downward (or upward), and the control rod 34 is pushed backward (or pulled). Hydraulic valve 4
The spool 41 of No. 0 moves back (or moves forward), the three-point linkage mechanism 11 rises (or falls), the entire planting section B rises (or falls), and the float 21 also rises (or falls). The front part of the float 21 is lowered (or raised) relative to the seedling planting device 37, and the float 21 is returned to a substantially horizontal state.

As the front part of the float 21 descends (or rises), the sleeve 33 is pulled (or pushed) downward (or upward), and the wire 32 is relatively pushed (or pulled) upward (or downward) to generate hydraulic pressure. When the spool 41 of the valve 40 advances (or enters) and the float 21 becomes approximately horizontal, the hydraulic valve 40 becomes a neutral state and the raising and lowering of the planting section B is stopped.

Therefore, when the traveling body A is tilted forward down (or forward up) due to unevenness of the tiller, the light emitted from the light emitting diode 64 (or 65) installed on the front side of the horizontal sensor 60 is It is blocked by the light shielding plate 63, the phototransistor 66 (or 67) is turned off, and the electromagnetic relay 81 (or 82) is turned off.
) is excited, and as a result, the motor 57 is rotated forward (or reversed). As a result, the screw 51 is rotated forward (or reverse), and the block body 52 fitted onto the screw 51 is moved in the direction of the solid line (or broken line) in FIG. The arm 54 is also moved in the direction of the solid line (or broken line) in the figure, and the sleeve 53 is moved forward (or backward).

On the other hand, when the traveling body A is tilted forward down (or forward up), the entire planting section B is also tilted forward down (or forward up), but the float 21 remains in contact with the field surface. Therefore, the front part of the float 21 and the connecting shaft 31 (therefore, the lower end of the wire 32) at the tip of the link element 29 attached to the seedling planting device 37 approach (or separate) while maintaining a substantially horizontal state.
The power works to do so. However, as described above, since the sleeve 33 moves forward (or backward) as the traveling body A tilts, the float 2 of the seedling planting device in the planting section B
1, the sleeve 33 moves backward, and no pulling (or pressing) force is applied to the wire 32 fitted in the sleeve 33, so the hydraulic valve 40 is not activated and the planting is stopped. Section B is not raised or lowered. That is, as the traveling body A tilts, the rotation angle of the float 21 with respect to the seedling planting device 37 becomes smaller (or larger), and therefore the distance between the lower end of the sleeve 33 and the lower end of the wire 32 becomes larger (or smaller), but No force is applied to 30 and control rod 34 is not operated.

The mounting arm 53 is rotated as the block body 52 moves due to the rotation of the motor 57, and when the mounting portion of the mounting arm 53 becomes approximately horizontal, the light emitted from the light emitting diode 64 (or 65) of the horizontal sensor 60 emits light. It is captured by the phototransistor 66 (or 67), the phototransistor 66 (or 6'7) is turned on, and the electromagnetic relay 81 (or 8
The excitation coil 81C (or 82C) of 2) is demagnetized, and the rotation of the motor 57 is stopped.

Therefore, while the traveling body is tilted forward downward (or forward upward), the float 2 for the seedling planting device 37 of the planting section B is
The planting work is performed by reducing (or increasing) the rotation angle of step 1. During such work, if the float 21 is not level even if the float 21 is pushed horizontally, and a force is applied to the float 21 from the field surface, the wire 32 is pressed and pulled by the vertical swing of the float 21, and the wire 32 is moved to the planting part B. The entire body is lowered and raised, and the float 21 is placed in a substantially horizontal state.

FIG. 7 shows the relationship between the longitudinal tilt angle of the traveling body A with respect to the horizontal, the rotation angle of the float 21 with respect to the seedling planting device 37, and the operating state of the hydraulic valve 40.

In the figure, the case where the traveling aircraft A is tilted forward is correct,
The case where the float 21 tilts forward downward is considered negative, the case where the float 21 rotates forward upward relative to the seedling planting device 37 is considered positive, and the case where the float 21 rotates forward downward relative to the seedling planting device 37 is considered negative. The range of the rotation angle of the float 21 with respect to the planting device 37 changes depending on the tilt angle of the traveling body A. Is it clearer than this picture? - If the float 21 is rotated outside the dead zone (0.5° to -1°) with respect to the seedling planting device 37 when it is in the horizontal state, the hydraulic valve 40
However, when the traveling body A is tilted forward by 3 degrees, the sleeve position changing mechanism 50 is driven, and the float 21 is moved at an angle of 13 degrees with respect to the seedling planting device 37 that goes down into the planting section B.
It can be rotated forward and downward. In such a state, the float 21 rotates by 0.5° to −1° or more relative to the seedling planting device 37, that is, the rotation angle of the float relative to the seedling planting device 37 is −2.5° to −4°. If it does not exceed the hydraulic valve 40
does not operate (see Fig. 7, Kojumaru), and therefore, the planting part B does not descend, and the float 21 is rotated by 13 degrees with respect to the seedling planting device 37 (approximately horizontal with respect to the field surface). Planting work will be carried out, and the float 21 will not sink. In other words, the relative angle between the seedling planting device 37 and the float 21, which is a dead zone for the control of the hydraulic valve 40, changes according to the tilt angle of the traveling machine in the front-back direction, and the relative angle of the seedling planting device 37 and the float 21, which is a dead zone for the control of the hydraulic valve 40, changes with the tilt angle of the traveling machine in the front-back direction. The dead zone is changed in accordance with the tilting of the traveling aircraft.

〔effect〕

According to the present invention, since the planting section is controlled to rise and fall based on the vertical movement of the float relative to the seedling planting device in order to maintain a constant planting depth, the seedlings are raised relative to the field surface. The implantation device is always located at a constant height. In addition, if the traveling machine is tilted in the front-back direction, the rotation angle of the float relative to the seedling planting device in the planting section is changed, so even if the machine is tilted in the front-back direction, the float will not move into the field. There is no risk of it sinking or floating above the rice field, and it will not cause buried or floating seedlings. Furthermore, in the present invention, since the horizontal sensor is attached to the connecting member that is tilted rearward with respect to the horizontal due to the movement of the block body, there is no need to detect the tilt angle in the front and rear direction of the aircraft in an analog manner, and control It becomes possible to simplify the circuit.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway left side view of the inventive machine, Fig. 2 is a plan view of the float in the planting section, Fig. 3 is a front view of its main parts, and Fig. 4 is the invention shown together with the side surface of the float. Fig. 5 is a schematic diagram of the main parts of the machine, Fig. 5 is a vertical cross-sectional view of the horizontal sensor, Fig. 6 is an electric circuit diagram of the main parts of the machine of the present invention, and Fig. 7 is the backward tilt angle of the traveling machine with respect to the horizontal and seedling planting. a graph showing the relationship between the tilting angle of the float relative to the device and the operation of the hydraulic valve;
FIG. 8 is a schematic diagram of the main parts of a conventional rice transplanter, and FIG. 9 is a graph for explaining the operation of the conventional rice transplanter. A... Traveling body B...: Planting section 11... Three-point link mechanism 13-... Horizontal sensor 21... Float 32... Wire 33... Sleeve 34... Control rod 37. ... Seedling planting device 40 ... Hydraulic valve 5
0... Sleeve position change mechanism 51... Length 52
...Block body 53...Mounting arm 55...
Seat 57...Motor 60...Horizontal sensor 63
...Shade plate patent Applicant: Yanmar Agricultural Machinery Co., Ltd. Agent Patent attorney: Noboru Kono 1st Part 2 Part 3

Claims (1)

[Claims] 1. A seedling planting device for planting seedlings on a rice field, and a rice planting machine in which a planting part having a float attached to the seedling planting device so as to be swingable in the vertical direction is attached to the traveling machine so that it can be raised and lowered. , a lifting device that controls the raising and lowering of the planting section based on the relative swinging position of the seedling planting device and the float in the planting section; and a position that operates to change the relative swinging position of the seedling planting device and the float. a horizontal sensor that is provided at a portion whose longitudinal orientation relative to the horizontal changes due to the operation of the position changing device and detects the longitudinal orientation relative to the horizontal; A rice transplanter characterized by operating a position change device.