JP2002101705A - Sulky rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disuse a troublesome correction operation by properly carrying out a marker automatic selection in a sulky rice transplanter in which a seedling planting apparatus liftably connected to a traveling machine body is equipped with a pair of right and left line drawing markers for forming a traveling standard line of a next process on the surface of a rice field so as to freely move the markers forward and backward and with a marker projection and selection means for selecting the line drawing markers so that both the right and left line drawing markers are retreated to a housing position in linking to the rise of the seedling planting apparatus and the line drawing markers are projected and operated to an action position in linking to the drop of the seedling planting apparatus. SOLUTION: This sulky rice transplanter is equipped with the marker projection and selection means made so as to automatically select line drawing markers 91a and 91b at the opposite side in a front wheel steering direction in linking to steering of front wheels 1 by a set angle or more and with a manual selection and operation tool 20 for preferentially selecting the line drawing markers 91a and 91b which are projected and operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling planting apparatus which is connected to a traveling machine so as to be able to move up and down and is provided with a pair of left and right drawing markers for forming a running reference line for the next step on a rice field. The left and right drawing markers are both retracted to the storage position in conjunction with the rise of the seedling, and the riding rice planting provided with marker protrusion selection means for selecting a drawing marker that operates to project to the working position in conjunction with the lowering of the seedling planting device. About the machine.

[0002]

2. Description of the Related Art In the above-mentioned riding rice transplanter, it is common for a driver to select a drawing marker to be protruded when the body is turned U-turn on a ridge. Also, to simplify this marker selection operation,
There is also a configuration in which a drawing marker to be protruded is automatically and alternately selected in conjunction with a raising operation of a seedling planting device.

[0003]

In the method of automatically selecting alternately the drawing markers to be protruded in conjunction with the raising operation of the seedling planting apparatus, the raising operation of the seedling planting apparatus is always performed in the direction change at the ridge. Although the operation is simplified by making good use of what is done, appropriate marker selection may not be performed depending on the work situation.

In other words, when it is necessary to supply seedlings to the seedling planting device during the planting run, and the seedling planting device is raised to a height suitable for replenishing seedlings, the raising operation is detected and the marker is detected. The automatic selection is performed, and the order of the alternate selection is out of order. Therefore, in order to correct the order of the automatic selection, the lifting lever must be idlely operated, which is a troublesome operation for an unskilled worker.

The present invention has been made in view of such a point, and a main object of the present invention is to make it possible to appropriately perform automatic marker selection so that troublesome correction operations are not required. Is what you do.

[0006]

Means for Solving the Problems [Structure, operation and effect of the invention according to claim 1]

(Structure) According to a first aspect of the present invention, a seedling planting device connected to a traveling machine so as to be able to move up and down is provided with a pair of left and right line drawing markers for forming a planting reference line for the next process on a rice field. In conjunction with the raising of the seedling planting device, both the left and right drawing markers are retracted to the storage position,
In a riding rice transplanter provided with marker protrusion selection means for selecting a drawing marker that operates to protrude to an action posture in conjunction with the lowering of the seedling planting device, the marker protrusion selection means,
An artificial selection operation tool configured to automatically select a drawing marker on the opposite side to the front wheel steering direction in conjunction with steering of the front wheel beyond the set angle, and to preferentially select a drawing marker to be protruded. It is characterized by having.

(Action) According to the above configuration, when the planting travel of one stroke is completed and the ridge is reached, the seedling planting device is raised to change the direction of the airframe, and the seedling planting device is lowered to move to the next stroke. Shift to planting run. In this case, by raising the seedling planting device prior to the change of the body direction, the one drawing marker that has protruded to the working posture in the previous planting process is retracted, and the body is stored in a state where the left and right drawing markers are stored together. A turn is made. At this time, since it is necessary to make a small turn in the direction change at the ridge, the front wheel is steered larger than the set angle, and based on this, it is recognized that the ridge is turning, and the opposite side to the turning direction Is automatically selected as the next drawing marker to be projected. Then, when the seedling planting device is lowered near the end of the turning to prepare for the next planting run, the drawing marker selected as described above protrudes to the action posture with this lowering.

Further, since the drawing marker can be preferentially selected by the artificial selection operation tool, the drawing marker to be protruded at the time of the first planting run can be arbitrarily selected.

(Effect) Therefore, according to the first aspect of the present invention, the marker to be protruded is automatically selected based on the steering direction of the front wheel, so that the marker can be selected according to the next stroke regardless of the progress. Was performed accurately, and the operability on the ridge side was improved.

[Structure, operation and effect of the invention according to claim 2]

(Structure) According to a second aspect of the present invention, in the first aspect of the present invention, the manual selection operating tool is shared with a priority raising / lowering operation lever for instructing the raising and lowering of the seedling planting apparatus preferentially.

(Action) According to the above configuration, when the planting travel of one stroke is completed and the ridge is reached, the priority raising / lowering operation lever is operated to greatly raise the seedling planting apparatus, and the airframe is moved in the predetermined headland. Steer the front wheels greatly to make a turn.

(Effects) Therefore, according to the second aspect of the present invention, the number of operation levers can be reduced by sharing the priority raising / lowering operation lever for issuing a priority raising / lowering command of the seedling planting apparatus and the operation lever for performing preferential selection of the drawing marker. Can be reduced, the above-described effect of the first aspect of the invention can be obtained, and the operation section around the operation section can be simplified.

[Structure, operation and effect of the invention according to claim 3]

(Structure) The invention according to claim 3 is the invention according to claim 1 or 2, further comprising an auto-up means for automatically raising the seedling planting apparatus in conjunction with the steering of the front wheel at a set angle or more. It is.

(Operation) According to the above configuration, when the planting run of one stroke is completed and the ridge is reached, the front wheels are steered at a stretch to make a U-turn in the predetermined headland.
By this large steering of the front wheels, the auto-up means works, and the seedling planting apparatus is automatically raised. In addition, the line drawing marker on the opposite side of the front wheel steering direction is automatically selected as the next projecting marker.

(Effects) Therefore, according to the third aspect of the present invention, the raising operation of the seedling planting device is not required, and the operation on the ridge is further simplified, which is effective in improving the handleability.

[Structure, operation and effect of the invention according to claim 4]

(Structure) According to a fourth aspect of the present invention, in the third aspect of the invention, the function of the auto-up means can be arbitrarily turned on and off.

(Operation) According to the above configuration, the seedling planting device is usually raised when turning around at the ridge, but in consideration of the round planting along the ridge which is performed at the end of the reciprocal planting. At the time of U-turn at the ridge, there is a case where turning is performed while leveling with the leveling float of the seedling planting device to reduce the roughness at the ridge. In such a case, if the function of the auto-up means is turned off, Good.

(Effects) Therefore, according to the invention of claim 4, the above-mentioned effects of the invention of claim 3 can be obtained, and suitable round planting with reduced roughness can be performed. It will be more convenient.

[Structure, operation and effect of the invention according to claim 5]

(Structure) According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the marker automatic selection function of the marker protrusion selection means is configured to be capable of on / off operation. is there.

(Operation / Effect) According to the above-described configuration, when a marker to be drawn for traveling or the like is not used, the marker automatic selection function is turned off, so that the control system mechanism is changed every time the aircraft is largely steered. It does not needlessly operate, which is effective in increasing the durability of the control device.

[Structure, operation and effect of the invention according to claim 6]

(Structure) The invention according to claim 6 is the invention according to any one of claims 1 to 5, further comprising double-side selection means for selecting the left and right drawing markers so as to project together. is there.

(Function / Effect) According to the above configuration, when a large field is divided and planted, two lines are drawn by projecting both the left and right delineation markers to travel first in the middle of the field to separate the fields. , 2 based on this
Planting can be performed in one field portion, and operations in various forms can be performed.

[0029]

1 and 2 show a side view and a plan view of a riding type rice transplanter configured to a six-row planting specification. This riding type rice transplanter is provided with six-row planting seedlings at the rear of a four-wheel-drive traveling machine body 3 having a pair of left and right steerable front wheels 1 and a pair of left and right non-steerable rear wheels 2. Device 4
Link mechanism 6 driven by hydraulic cylinder 5
It is provided with a basic structure that is connected up and down freely via the.

A transmission case 8 supporting the front wheels 1 is connected and fixed to a front portion of the body frame 7, and a rear transmission case 9 supporting the rear wheels 2 is supported at a rear portion of the body frame 7 so as to freely roll. The engine 11 is mounted on the front frame 10 extending forward from the transmission case 8.
Are mounted horizontally and covered with a bonnet 12. An upper portion of the body frame 7 is provided with a step 13 extending over the entire length of the body, and a rear portion of the step 13 is curved rearward and upward to form a fender portion 14 extending above the left and right rear wheels 2. In addition, a center cover portion 15 is protruded from the fender portion 14, and a driver's seat 16 is installed on the center cover portion 15. A steering handle 17 for steering the front wheels, a main shift lever 18, a priority operation lever 20 for elevating and lowering, and the like are provided at a rear portion of the bonnet 12, and the bonnet 12 is provided.
The step portion 13a extending to the left and right sides of the vehicle forms a passage for getting on and off from the front of the fuselage. Has been deployed.

As shown in FIG. 3, on the left side of the transmission case 8, a hydrostatic continuously variable transmission (HST) is interlocked to the engine 11 via a belt transmission 21.
Is connected to the main transmission 22,
The transmission output of No. 2 is transmitted to the transmission case 8 and branched into a traveling system and a working system. Specifically, as shown in the transmission system diagrams of FIGS. 4 and 5, the shifting power from the main transmission 22 is transmitted to the input shaft 24 via the multi-plate main clutch 23 provided therein, and then transmitted to the second shaft. Is transmitted to the shaft 25 at a reduced speed,
Here, it is branched into a traveling system and a working system.

The second shaft 25 and the third shaft 2 which is a traveling system transmission shaft
6, a gear-type auxiliary transmission 2 that performs two-speed shifting
7 is provided, and the power of the traveling system is
7, the left and right front wheels 1 are shifted via the differential device 28.
Is transmitted to Further, a part of the traveling system power transmitted to the differential device 28 is taken out from the rear of the transmission case 8,
The power is transmitted to the rear transmission case 9 via the main transmission shaft 29 arranged in the lower abdomen of the body, and the left and right rear wheels 2 are driven at a speed synchronized with the front wheels 1. A sub-transmission lever 30 for operating the sub-transmission 27 is provided on the left side of the driver's seat 16 so as to be able to swing back and forth. A differential lock pedal 32 for operating a differential lock mechanism 31 provided in the differential device 28 is provided at a position of the driver's seat 16 near the left side of the foot.

Further, only the forward rotation power of the power of the second shaft 25 is taken out via the one-way clutch 33 and is shifted in multiple stages by the inter-stock transmission 34.
, And is transmitted to the seedling planting device 4 via a work transmission shaft 36 and a telescopic transmission shaft 37 arranged in the lower abdomen of the machine body.

In the rear transmission case 9, a lateral transmission shaft 41 receiving power from the main transmission shaft 29 is laid horizontally, and the power of the lateral transmission shaft 41 is provided by a multi-plate type side clutch 42 disposed near both ends of the case. The power is transmitted to the axle 44 of the rear wheel 2 via the gear reduction mechanism 43. Also, on one side (the right side in this example) of the rear transmission case 9, a multi-plate type brake 45 acting on the horizontal transmission shaft 41 is provided.
And an operation arm 46 of the brake 45 is interlocked to a pedal 47 provided on the right front of the step 13 via a link rod 48. Further, a support shaft 49 of the pedal 47 extends to the left of the fuselage and is also linked to the main clutch 23, so that the pedal 47 is depressed to operate the brake 45 and at the same time to operate the main clutch 23 to be turned off. ing. That is, the pedal 47 functions as a main clutch / brake pedal.
Further, in the vicinity of the pedal 47, a lock fitting 49 for locking and locking the pedal 47 depressed to the braking operation position at that position is swingably provided and urged to swing in the unlocking direction. The brake 45 is used as a parking brake by the pedal lock using the lock fitting 49.

As for the left and right side clutches 42, only those inside the turning operation are automatically turned off based on the body steering operation to provide a body steering function. The mechanism 50 is configured as follows. That is, as shown in FIG. 6, a pitman arm 51 oscillated around the vertical axis Z by the steering handle 17 and a knuckle arm 52 of each of the front wheels 1 are interlocked via a tie rod 53 to form a steering link mechanism. 54 is configured,
An operation fitting 51a connected to the pitman arm 51 and a relay arm 55 provided at a lower portion near the front and rear middle of the fuselage so as to be swingable about a vertical axis Y are interlockingly connected by a push / pull rod 56. The left and right ends of the balance arm 58 connected to the upper end of the fulcrum shaft 57 and the operation arms 59 of the left and right side clutches 42 are operatively connected via rods 60, respectively.

An elongated hole is formed in a link between the operating bracket 51a of the pitman arm 51 and the push / pull rod 56, so that the pitman arm 51 is at a predetermined angle (for example, 30 °) or more from the straight forward posture. The pitman arm 51 is pushed only when it swings
6, the size of the slot accommodation is set so that the swing less than the set angle is not transmitted.

Therefore, when the left and right front wheels 1 are steered more than a set angle in order to make the aircraft turn significantly, the swing of the pitman arm 51 is transmitted to the balance arm 58 via the relay arm 55, and the pulling operation is performed forward. Rod 60
Only one of the side clutches 42 linked to is operated. In other words, only the side clutch 42 on the inside of the turn is disengaged, the body turns by the three-wheel drive of the front left and right wheels 1 and the rear wheel 2 on the outside of the turn, and the inside rear wheel 2 in the idle state turns the body of the body. The vehicle rotates with the rear wheel 2 inside the turning without unduly damaging the field with the turning movement following the turning movement.

The seedling planting device 4 places the six rows of seedlings thereon, and is reciprocally moved left and right by a set stroke.
It is configured to include six sets of rotary planting mechanisms 63 for cutting and planting seedlings for each plant, and three leveling floats 64 for leveling planting locations.

As shown in FIG. 7, a horizontally long planting frame 65 is laid horizontally on the seedling planting device 4. Near the center of the planting frame 65, a feed receiving work power via a telescopic transmission shaft 36 is provided. A case 66 is supported, and three planting cases 67 are connected to the planting frame 65 in a cantilevered rearward direction. Rotating planting mechanisms 63 are respectively provided on the left and right rear ends of the planting cases 67.

The feed case 66 has a screw shaft 68 for driving the seedling nest 61 laterally and a seedling feed belt 69 for vertically feeding the seedlings placed on the seedling nest 61 toward the lower take-out portion.
And a vertical feed drive shaft 70 for operating the seedling rest 61 at each horizontal movement stroke end, and the power taken out of the feed case 66 is transmitted to each planting case 67 via the transmission shaft 71. It has become.

The base of each planting case 67 is equipped with a torque limiter 72 for preventing an overload from acting on the planting mechanism 63, and the tip of each planting case 67 is provided with a left and right planting mechanism 63. A ridge-side clutch 73 for intermittently transmitting power to the vehicle is provided. The ridge-side clutch 73 is used when planting less than all the lines (in this case, six lines) in the planting process near the ridge, and a part of the line is used in units of two lines. Planting can be suspended.

Each of the ridge-side clutches 73 is wire-connected to a ridge-side clutch lever 74 projecting from the driver's seat 16 so as to be able to swing back and forth on the fender portion 14 at the rearmost portion of the fuselage. Although not shown, the drive unit of the six seedling feed belts 69 provided on the seedling holder 61 is provided with a vertical feed clutch in units of two, and each of the vertical feed clutches is provided to the ridge-side clutch lever 74. The seedling feeding belt 69 corresponding to the strip that is linked and the row-side clutch 73 has been disengaged and planted and stopped has also been stopped.

The hydraulic cylinder 5 for raising and lowering the seedling planting device 4 is connected to an electromagnetic control valve 80 mounted on the transmission case 8, and operates the electromagnetic control valve 80 based on the driver's artificial command information. The seedling planting apparatus 4 can be raised and lowered arbitrarily by performing the above operation, and the seedling planting apparatus 4 can be moved to the rice field T by controlling the operation of the electromagnetic control valve 80 based on the height detection information for the rice field T of the seedling planting apparatus 4. The automatic raising and lowering is performed in accordance with the following. The schematic configuration of the automatic raising and lowering control means will be described below with reference to FIG.

On the right side of the driver's seat 16, a planting lever 82 whose operating position is detected by a potentiometer 81.
Are provided to be able to swing back and forth. This planting lever 8
2 is “planting” position, “down” from front to back
The operation positions of the position, the “neutral” position, and the “up” position are set, and the “auto” position is set following the “up” position. When the planting lever 82 is operated to the “planting” position, the planting clutch 35 is engaged by the motor 83 and operated.
At the “down” position, the “neutral” position, and the “up” position, the planting clutch 35 is turned off.

"Planting", "descending", "neutral", and
The operation path for selecting each of the operation positions of “elevation” is an operation used when performing planting work while operating the planting lever 82 or when raising or lowering the seedling planting apparatus 4 to an arbitrary height during non-work. By operating at the “planting” position, the seedling planting apparatus 4 is automatically controlled to move up and down based on the height detection result with respect to the rice field T, regardless of whether the traveling machine 3 is floating or tilting forward and backward. The planting device 4 is maintained at a set height with respect to the rice field T. That is,
Of the three leveling floats 64 provided in the seedling planting apparatus 4, the central leveling float 64 functions as a sensor float SF for detecting the height of the seedling planting apparatus 4 with respect to the rice field T. This sensor float SF Is vertically displaced around the rear fulcrum c due to the fluctuation of the ground pressure, the vertical displacement of the front part of the float is transmitted to the machine body via the sensor wire 84, and is detected by the potentiometer 85.

The potentiometers 81 and 85 are connected to a controller 86, and the operation of the electromagnetic control valve 80 is controlled based on the input information. Here, a reference signal to be compared with an output signal from the potentiometer 85 is set so that the electromagnetic control valve 80 is in a neutral state when the vertical swing posture of the sensor float SF is in a predetermined state, When the output signal from the potentiometer 85 deviates from the range of the reference signal, the electromagnetic control valve 80 is controlled based on the comparison between the output signal from the potentiometer 85 and the reference signal so that the electromagnetic control valve 80 is operated upward or downward. The operation of the electromagnetic control valve 80 is controlled.

Therefore, when the seedling planting device 4 is at a predetermined height with respect to the rice field surface T, the attitude of the sensor float SF is within the set range, and a neutral state of the down control is brought. Then, when the seedling planting device 4 sinks against the rice field surface, the contact pressure of the sensor float SF increases from the set range, so that the front portion of the sensor float SF is relatively pushed up and displaced, and this is detected by the potentiometer 85. Then, the raising of the seedling planting device 4 is controlled. Further, when the seedling planting device 4 starts to float on the rice field T, the contact pressure of the sensor float SF decreases from the set range, and the sensor float S
The front part of F is displaced downward by its own weight and biasing load,
This is detected by the potentiometer 85 and the planting device 4
Is controlled to descend. As described above, the fact that the sensor float SF is vertically displaced by the fluctuation of the ground pressure is electrically detected by the potentiometer 85, and the operation of the electromagnetic control valve 80 is controlled. It is maintained at the height of.

When the reciprocating planting operation is performed by operating the planting lever 82, the planting lever 82 is moved from the "planting" position to the "elevated" position at once when the planting of one stroke is completed and the ridge is reached. By operating the seedling planting device 4, the planting clutch 35 is disengaged, and at the same time, the direction of the machine body is changed. In this case, when the seedling planting device 4 reaches the upper limit, this is detected by the upper limit switch LS, and the ascent is automatically stopped. Then, when the direction change is near to the end, the planting lever 82 is once operated to the “down” position to lower the seedling planting device 4 until it comes into contact with the rice field T. At this time, the planting clutch 35 is still in the disconnected state. When the change of direction and the alignment for the next planting process are completed, the planting lever 82 is operated to the "planting" position, whereby the automatic raising / lowering control is resumed, and the planting clutch 35 is engaged to move the planting clutch 35 to the next position. The planting run of the process is performed.

The “automatic” position is an operation position for setting a mode for performing the planting operation efficiently by simplifying the operation at the ridge in the reciprocating planting operation.
Of the planting clutch 35 is moved up and down by the priority operation lever 20 disposed on the right side of the steering handle 17.
Is performed as follows.

As shown in FIG. 9, the first operation lever 20 is
It is configured as a cross-operation type that can swing up and down and swing back and forth, and is urged to return to a neutral position. Upward operation and downward operation are detected by an up switch Sw (u) and a down switch Sw (d), respectively. The electromagnetic control valve 80 and the electric motor 83 based on the detection result.
Is controlled as follows, and a forward operation and a backward operation are detected by a left switch Sw (L) and a right switch Sw (R), respectively, and a later-described drawing marker selecting operation is performed. .

When the upshift switch Sw (u) is turned on once by operating the priority operation lever 20 upward while the planting lever 82 is operated to the "automatic" position, the electric motor 83 is operated and the planting clutch 35 is operated. Is turned off,
After the confirmation of the planting clutch disengagement operation, the electromagnetic control valve 80 is switched to the raising operation state, and the seedling planting device 4 is raised preferentially to the upper limit. Further, when the priority operation lever 20 is operated downward and the down switch Sw (d) is turned on once while the seedling planting device 4 is at the upper limit position, the electromagnetic control valve 80 is switched to the lowering operation state, and the seedling planting is performed. Device 4
Is lowered to the working height. Here, in the first on-operation of the down switch Sw (d), the seedling planting device 4 only operates to descend, the electric motor 83 does not operate, and the planting operation is performed even when the planting device 4 descends to the rice field T. I will not be told. Then, the priority operation lever 20 that has returned to neutral is again operated downward, and the down switch Sw
When (d) is turned on for the second time, the electric motor 83 is actuated, the planting clutch 35 is engaged, and the planting operation is started.

Therefore, when the planting lever 82 is operated to the "automatic" position, when the planting travel of one stroke is completed and the plant reaches the edge of the ridge, it is only necessary to lightly operate the priority operation lever 20 once upward with a finger. Then, the planting clutch 35 is disengaged and the seedling planting device 4 is raised, so that the operator can concentrate on operating the steering handle 17.
In addition, at an appropriate time until the end of the airframe direction change, by lightly operating the priority operation lever 20 once downward with a finger,
The seedling planting apparatus 4 can be lowered until the ground contact without contacting the planting clutch 35. At the end of the change of the airframe direction, alignment to the next step is performed, and the end position of the seedling row in the previous planting step is determined and priority is given. By lightly operating the operation lever 20 downward again, the planting start position of the next process can be aligned with the planting end position of the previous planting process. The above-described operation based on the up / down operation of the priority operation lever 20 is performed only when the planting lever 82 is operated in the “automatic” position, and the planting lever 82 is in the “automatic” position. When the priority operation lever 20 is not operated, the priority operation is not performed.

In addition, the rice transplanter can be raised by the auto-up function in conjunction with the turning of the machine. That is, at the fulcrum of the pitman arm 51 in the steering link mechanism 54,
A potentiometer 87 for detecting the steering angle and the steering direction of the front wheel 1 is provided and connected to the controller 86, and the front wheel 1 has been steered beyond a set angle at which the side clutch automatic operation mechanism 50 operates. Is detected, the electromagnetic control valve 80 is operated, and the seedling planting apparatus 4 is automatically raised to the upper limit. If the priority operation lever 20 is operated upward before the auto-up is performed, the ascending control is performed as described above, and the descending after the ascent operation is performed based on the operation of the priority operation lever 20 as described above. Done.

When the planting lever 54 is operated to the "automatic" position, the automatic raising control (backup control) of the seedling planting device 4 based on the backward movement of the machine is executed. In other words, the main transmission lever 18 that operates the hydrostatic continuously variable transmission 22 as the main transmission to adjust the forward and backward movements in a stepless manner is
A left and right side of the steering handle 17 is provided so as to be capable of swinging back and forth from a forward range F to a reverse range R. When the main speed change lever 18 is operated beyond the neutral N to the reverse range R, the reverse switch is operated. The electromagnetic control valve 80 is preferentially switched to the ascending operation state based on this detection, the seedling planting device 4 is automatically moved up, the planting clutch 35 is turned off, and the leveling float is set by the body reversing. A situation in which the rear portion of the 64 rushes into the rice field T or collides with the ridge is prevented beforehand.

On the left and right sides of the seedling planting device 4, there are provided line drawing markers 91a and 91b for forming a body running reference line of the next stroke on the rice field T so as to be able to swing up and down. The drawing markers 91a and 91b are provided so as to protrude to the drawing action posture, and when the seedling planting device 4 is raised, the operation wires 92a and 92b are pulled by the operation of the quadruple link mechanism 6 so that both the drawing wires 91a and 91b are pulled. Drawing marker 91
Both a and 91b are swung up and swung to the storage position, and are locked and locked to the standing storage position by lock mechanisms 93a and 93b, respectively.

More specifically, as shown in FIGS. 10 and 11,
An operation arm 94 connecting the front ends of the operation wires 92a and 92b is rotatably supported by a fixed bracket 95 around a fulcrum d. The operation arm 94 extends from the base end of the quadruple link mechanism 6 to be integrally rotatable. The operation wire 92 is pressed by the protruding contact lever 6a and forcedly rotated.
a and 92b are drawn, and the drawing markers 91a and 91b are stored upright against the projecting urging force. The lock mechanisms 93a and 93b are configured to lock and hold the operation arm 94 rotated to the storage position with a lock lever 97 rotatable around a fulcrum e and urged by a spring 96. Solenoids 98a and 98b for releasing the lock lever 97 against a spring 96 are mounted on a fixed bracket 95, and are electrically connected to the controller 86. Then, the priority operation lever 20 is
Operate forward or backward in the same way as a turn signal lever of a car to turn left switch Sw (L) or right switch Sw.
By operating (R), one of the corresponding solenoids 98a, 98b is energized to selectively unlock the left or right lock mechanism 93a, 93b.

That is, when the priority operation lever 20 is operated forward from the neutral position, the lock mechanism 93a of the left drawing marker 91a is unlocked, and the priority operation lever 20 is released.
Is operated forward from the neutral position, the lock mechanism 93b of the right drawing marker 71b is unlocked, and only the unlocked one of the drawing markers 91a or 79b is used by the lowering of the seedling planting device 4 to use the posture. It is urged to protrude.

The drawing markers 91a, 91b
Is not only arbitrarily selected using the priority operation lever 20 as described above, but also provided with an auto marker function for automatically performing the operation in accordance with the steering of the aircraft. That is, when the potentiometer 87 detects that the front wheel 1 has been steered beyond the set angle at which the side clutch automatic operation mechanism 50 operates, the direction opposite to the direction in which the front wheel 1 is steered,
That is, the lock mechanisms 93a and 93b of the drawing markers 91a and 91b on the non-planting side are unlocked.

The controller 86 includes an auto-up on / off switch Sw1 for starting and stopping the auto-up function for automatically raising the seedling planting device 4 in association with the steering of the aircraft, and a drawing marker 9 for projecting.
An auto-marker on / off switch Sw2 for starting and stopping an auto-marker function for automatically selecting 1a and 91b in association with the steering of the aircraft is connected, and each function is arbitrarily exhibited or stopped. Is possible. The controller 86 is also connected to a double-sided switch Sw3 for simultaneously unlocking both marker lock mechanisms 93a and 93b.
Is operated, the left and right drawing markers 91a, 91
It is possible to obtain a state in which both the projections b project to the working posture.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a plan view of the traveling body.

FIG. 3 is a plan view of a front part of the fuselage.

FIG. 4 is a schematic development view mainly showing a traveling system of the transmission structure.

FIG. 5 is a schematic development view mainly showing a working system of the transmission structure.

FIG. 6 is a plan view showing the underbody structure of the traveling body.

FIG. 7 is a plan view showing a main part of the seedling planting apparatus.

FIG. 8 is a plan view of a planting lever.

FIG. 9 is a right side view of the priority operation lever.

FIG. 10 is a side view showing a retractable structure and a lock mechanism of a drawing marker.

FIG. 11 is a plan view of the lock mechanism showing a state where the drawing marker is stored and locked.

FIG. 12 is a block diagram of a control system.

[Explanation of symbols]

 Reference Signs List 1 front wheel 3 traveling body 4 seedling planting device 20 artificial selection operation tool (priority operation lever) 91a line drawing marker 91b line drawing marker T

Claims (6)

[Claims] 1. A seedling planting device connected to a traveling machine so as to be able to move up and down is provided with a pair of left and right drawing markers for forming a traveling reference line for the next step on a rice field, and is capable of moving out and back, and in conjunction with the raising of the seedling planting device. Both the left and right drawing markers are retracted into the storage position, and the riding rice transplanter is provided with marker protrusion selection means for selecting a drawing marker that is operated to protrude to the operating position in conjunction with the lowering of the seedling planting device. The selection means is configured to automatically select a drawing marker on the opposite side to the front wheel steering direction in conjunction with the steering of the front wheel at a set angle or more, and preferentially selects a drawing marker to be protruded. A riding rice transplanter having an artificial selection operation tool. 2. The riding rice transplanter according to claim 1, wherein the artificial selection operation tool is shared with a priority operation lever that instructs the seedling planting apparatus to elevate and lower with priority. 3. The riding rice transplanter according to claim 1, further comprising an auto-up means for automatically raising the seedling-planting device in conjunction with the steering of the front wheel at a set angle or more. 4. The riding rice transplanter according to claim 3, wherein the function of the auto-up means can be arbitrarily turned on / off. 5. The riding rice transplanter according to claim 1, wherein the marker automatic selection function of the marker protrusion selection means is configured to be turned on / off. 6. The riding rice transplanter according to claim 1, further comprising double-side selection means for selecting the left and right drawing markers so as to project together. .