JPH11313515A - Riding rice transplanter - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To set an installation position of a sensitivity adjustment lever arbitrarily according to the specifications of a machine body, and to perform a raising / lowering control of a seedling planting apparatus with a suitable sensor sensitivity according to use conditions. Can provide a rice transplanter for riding. A riding rice planting provided with a raising / lowering lever (54) for operating a control valve (50) for raising and lowering a seedling planting device, and a sensitivity adjusting lever (66) for changing a reference state of a sensor wire (43) to change and adjust a reference posture of a ground sensor. In the machine, a wire support arm 67 for supporting the sensor wire 43 is provided at a position behind the control valve 50 on the fuselage, and the wire support arm 67 and the sensitivity adjustment lever 66 are interlocked via a linkage member 68 such as a rod. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding rice transplanter configured to mechanically control a raising and lowering of a seedling planting device connected to a rear portion of an airframe.

[0002]

2. Description of the Related Art As a riding rice transplanter described above, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-107742, a seedling planting device connected to the rear of a traveling machine so as to be able to move up and down according to the variation of the ground pressure. In addition to the vertical displacement sensor, the traveling machine is equipped with a hydraulic cylinder control valve that drives the seedling planting device up and down, and the ground sensor and the control valve are interlocked and connected via a sensor wire, based on the vertical displacement of the ground sensor. The control valve to maintain the height of the seedling planter with respect to the rice field within a certain range, and operate the control valve on one side of the driver's seat provided at the rear of the traveling machine. There is known a structure provided with a lifting lever to change the reference state of the sensor wire and a sensitivity adjustment lever to change and adjust the reference attitude of the ground sensor. The front end of the outer wire of the sensor wire is supported at the lower end of the bar, and the front end position of the outer wire is changed by swinging the sensitivity adjustment lever back and forth so that the reference state of the sensor wire is changed and adjusted to adjust the sensor sensitivity. Had become.

[0003]

In the conventional elevating control device having the above-mentioned structure, the position of the sensitivity adjusting lever is limited to the rear of the elevating lever. There was a case where it hindered the arrangement and made it difficult for the driver to operate.

[0004] The present invention has been made in view of such a point, and it is possible to arbitrarily set the installation position of the sensitivity adjustment lever according to the specifications of the body and the like.
It is a main object of the present invention to be able to perform elevation control with a suitable sensor sensitivity according to use conditions.

[0005]

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 the rear of a traveling machine so as to be able to ascend and descend is provided with a grounding sensor that is vertically displaced in accordance with a change in grounding pressure. A control valve of a hydraulic cylinder to be driven up and down is provided on one side of a driver's seat, the ground sensor and the control valve are interlocked via a sensor wire, and the control valve is controlled based on the vertical displacement of the ground sensor. Activate, constitute a lifting control device to maintain the height of the seedling planting device with respect to the rice field within a certain range, and,
In a riding rice transplanter provided with a sensitivity adjusting lever for changing a reference state of the sensor wire by changing a reference state of the sensor wire, a lifting lever for operating the control valve, And a wire support arm for supporting the sensor wire is provided, and the wire support arm and the sensitivity adjustment lever are interlocked and connected via a linking member.

(Operation) According to the above configuration, the sensitivity adjusting lever can be arranged at an arbitrary position regardless of the position of the wire support arm. Also, by changing the mechanical linkage between the wire support arm and the sensitivity adjustment lever,
It is possible to adjust the sensor sensitivity with respect to the operation position of the sensitivity adjustment lever, and to change the sensitivity adjustment width for the entire operation amount of the sensitivity adjustment lever.

(Effects) Therefore, according to the first aspect of the present invention, it is possible to arbitrarily set the installation position of the sensitivity adjustment lever according to the specifications of the machine body, or to set the sensitivity adjustment lever to a position that is easy for the driver to operate. This makes it easy to construct a rice transplanter with excellent usability. In addition, it is easy to arbitrarily adjust the sensitivity adjustment state for the sensitivity adjustment lever, and it is possible to perform elevation control with a suitable sensor sensitivity according to field conditions.

[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, a fertilizer supply unit of a fertilizer is disposed at a position behind the driver seat in the traveling body and above the wire support arm. Is provided.

(Operation) According to the above configuration, the sensitivity adjustment lever is moved to a position (for example, forward) deviated from above the wire support arm, and the fertilizer supply unit of the fertilizer is disposed at the vacant location. Become. Here, when the fertilizer supply unit of the fertilizer applicator is located at the rear part of the machine body, the fertilizer apparatus can be provided while maintaining the weight balance of the machine body better than when the fertilizer apparatus is provided in the seedling planting apparatus.

(Effects) Therefore, according to the second aspect of the invention, the sensitivity can be adjusted while the fertilizer supply unit of the fertilizer can be arranged between the driver's seat at the rear of the body and the seedling planting device at the rear thereof. The lever can be arranged at any position where the lever is easy to operate, which is effective in constructing a riding rice transplanter with a fertilizer that has good weight balance and excellent operability.

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

(Structure) According to a third aspect of the present invention, in the first or second aspect of the present invention, a connecting position of the linking member for linking the wire supporting arm and the sensitivity adjusting lever to the wire supporting arm or the sensitivity adjusting lever. Is configured to be adjustable.

(Operation / Effect) According to the above configuration, by adjusting the connection position between the wire support arm and the linking member or the connection position between the linking member and the sensitivity adjusting lever,
By changing the lever ratio for operating the wire support arm, it is possible to change the sensitivity adjustment amount for the unit operation amount of the sensitivity adjustment lever, or to change the sensitivity adjustment width for the entire operation amount of the sensitivity adjustment lever. The above-described effect of the first or second aspect of the present invention is provided, and at the same time, it is possible to perform elevation control with a suitable sensor sensitivity according to field conditions.

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

(Structure) The invention according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the elevating lever and the sensitivity adjusting lever are arranged side by side on the left and right, and the operating area of the elevating lever is arranged. And the operation range of the sensitivity adjusting lever is overlapped in front and rear.

(Operation / Effect) According to the above configuration, the sensitivity adjustment lever can be moved forward and installed, so that the entire lever operation area of the lifting lever and the sensitivity adjustment lever can be shortened forward and backward. It is easy to handle for the driver.

[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 raising / lowering lever and the sensitivity adjusting lever project from a common lever guide, and the lever guide is provided. The operation groove portions of the respective levers are connected to each other.

(Operation) According to the above configuration, the sensitivity setting device is used in place of the sensitivity adjustment lever, the control valve is an electromagnetic control valve, and the position of the elevation lever is detected by a potentiometer or the like to perform the electrical control for performing the elevation control. When configuring a rice transplanter with specifications, the operation groove of the sensitivity adjustment lever formed on the lever guide can be part of the operation area of the lifting lever, and this is set as the operation position for performing various automatic controls It becomes possible.

(Effects) Therefore, according to the fifth aspect of the invention, the lever guide is used for both the model having the mechanical lifting control device and the model having the electric lifting control device. This is effective in reducing costs by sharing parts.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall side view of a riding rice transplanter with a fertilizer application device, and FIG. 2 shows an overall plan view thereof. In this rice transplanter, a six-row planting planting device 4 is connected to the rear of a traveling body 1 configured as a four-wheel drive type via a four-link mechanism 3 driven by a hydraulic cylinder 2 so as to be movable up and down. At the same time, the structure is such that the fertilizer applicator 5 is arranged at an upper part of the rear part of the body.

An engine 6 is mounted on a front portion of the traveling body 1 and a transmission case 8 is provided for supporting a steering front wheel 7. A driver seat 9 is provided on a rear portion of the body, and A rear transmission case 11 that supports the wheel 10 is provided. Engine power is input to the transmission case 8 via a belt-type continuously variable transmission 12 and transmitted to the front wheels 7, and the transmission shaft 12 and the rear The power is transmitted to the rear wheel 10 via the transmission case 11. The working power branched via the planting clutch 13 provided inside the transmission case 8 is transmitted to the transmission shaft 14.
Is transmitted to the seedling planting device 4 via the.

The seedling planting device 4 includes the transmission shaft 14
A feed case 16 receiving power from the plant, a horizontally long planting section frame 17, a seedling rest 18 on which six rows of seedlings F are placed and moved laterally with a constant stroke, and a cantilever facing the planting section frame 17 in parallel to the left and right. Three planting cases 19 attached in the form of a circle, a rotary planting mechanism 20 mounted on the rear left and right of each planting case 19, and center floats 2 arranged in parallel on the left and right so as to level the planting points of each strip.
1 and a pair of left and right side floats 22 and the like.

As shown in FIGS. 3 and 4, the fertilizer applicator 5 is disposed between the driver's seat 9 and the seedling cradle 18, and is a fertilizer hopper 2 for storing granular fertilizer.
3, a rotary feeding mechanism 24 for feeding the fertilizer by a set amount from the lower part for six rows, a blower 25 for air-feeding the fed fertilizer, and an electric motor 26 for driving the same. Fertilizer is supplied via a supply hose 28 to a groove generator 27 attached to the center float 21 and the pair of left and right side floats 22,
It shall be buried shallowly in the lateral part of the planting seedling of each line. The feeding mechanism 24 is driven by branch power taken out of a branch case 29 via a transmission system to the seedling planting device 4. The fertilizer remaining in the fertilizer hopper 23 is collected and collected by a collection hose 30.

The center float 21 functions as a grounding sensor S for automatically controlling the raising and lowering of the seedling planting apparatus. The raising and lowering control mechanism is configured as follows.

As shown in FIGS. 5 to 7, a float fulcrum shaft 31 is horizontally suspended below the base of each planting case 19 by a planting depth adjusting lever 32 so as to be rotatable. The grounding sensor S is provided at the rear end of the float support arm 33 extending rearwardly in a cantilever manner.
The (center float 21) is vertically swingably connected about the fulcrum a, and is supported by the planting section frame 17 via a bending link 34 at the front thereof so as not to swing sideways. Although not shown, the left and right side floats are also respectively connected and supported by the rear ends of the left and right float support arms that extend rearward from the float fulcrum shaft 31 in a cantilever manner.

The planting depth adjusting lever 32 for rotating and adjusting the float fulcrum shaft 31 is penetrated by a lever guide 35 fixed to the front portion of the planting portion frame 17, and the guide hole 3 is provided.
6 can be locked at a plurality of operating positions. The planting depth adjusting lever 32 is swingably adjusted to an arbitrary position and the float support arm 33 is vertically swung to adjust the planting mechanism. It is configured to change the height of the float group relative to 20 to adjust the planting depth.

As shown in FIG. 6, the lever guide 35
The sensor bracket 38 is mounted to be movable up and down in parallel via a parallel quadruple link mechanism 37, and an engaging pin 39 provided on the planting depth adjusting lever 32 is engaged with the parallel quadruple link mechanism 37. When the fulcrum a of the grounding sensor S is moved up and down by the swinging operation of the planting depth adjustment lever 32, the sensor bracket 38 is moved in conjunction with this.
Are moved up and down by the same amount in the same direction as the direction of movement of the fulcrum a.

The sensor bracket 38 is pivotally connected to a sensor arm 40 which can swing around a fulcrum b. The rear end of the sensor arm 40 and the front part of the ground sensor S are connected by a rod 41. Up and down swing of the ground sensor S is detected as swing of the sensor arm 40 in coordination. The upper end of the rod 41 penetrates the sensor arm 40 so that it can protrude upward and cannot come out downward, and a coil spring 42 to which an initial compressive load is applied is externally fitted. The displacement of 41 is transmitted to the sensor arm 40 as it is, but when the rod 41 is pushed up beyond the swing limit of the sensor arm 40, the coil spring 42 is compressed and deformed, and the rod 41 projects and displaces with respect to the sensor arm 40, An excessive thrust stroke of the rod 41 is absorbed.

The front end of the sensor bracket 38 is connected to the rear end of the outer wire 43b of the sensor wire 43 using a release wire, and the end of the inner wire 43a is connected to the front end of the sensor arm 40. It is connected to. In addition, the sensor arm 4
The rod 44 extends upward from the rear of the sensor bracket 38 and is slidably supported by the support portion 38a bent from the sensor bracket 38 so as to be slidable.
The sensor arm 4 is attached to the sensor arm 4
0 is pressed downward.

Below the right side of the driver's seat 9, a control valve 50 for controlling the operation of the hydraulic cylinder 2 is provided. The control valve 50 can be arbitrarily operated manually and automatically operated by the ground sensor S. The valve operation structure will be described below.

As shown in FIG. 8, the control valve 50 is provided with an operation shaft 51 for slidingly operating a spool (not shown) provided therein by a rotating operation.
The operation lever 52 is fixed to the protruding end of the device 1, and the sensing lever 53 is freely rotatably mounted. Here, the interior spool is urged in a direction to extend the hydraulic cylinder 2 to lower the seedling planting device 4, and the urging force constantly urges the operation shaft 51 to rotate counterclockwise in the drawing. ing. The control valve 50 includes an elevating lever 54 that can swing back and forth about the fulcrum c. A contact pin 56 of an operation arm 55 that swings integrally with the elevating lever 54 contacts the operation lever 52. It is linked. FIG. 8 shows a state in which the elevating lever 54 is in the “neutral” position, and the “elevating” position is behind the “neutral” position.
A “down” position is set in front of each of them. That is, when the elevating lever 54 is operated from the “neutral” position to the “elevated” position, the operating lever 52 is rotated clockwise in the drawing via the contact pin 56, and the operating shaft 51 is moved downward. If the raising and lowering lever 54 is returned to the "neutral" position after being rotated upward against the urging force, the seedling planting apparatus 4 is fixed at an arbitrary position. Also, the lifting lever 54 is set to “neutral”.
When operated from the position to the "down" position, the contact pin 56 escapes upward, whereby the operation lever 52 and the operation shaft 51 are urged and rotated in the counterclockwise direction in the figure to bring a lower state. .

The elevating lever 54 is configured to be swingable to a "planting" position, which is far beyond the "down" position, and is mounted on the lifting lever 54 and the mission case 8. The operating lever 57 of the clutch 13 is interlocked with the operating lever 57 via the curved link 58, the stroke absorbing spring 59, the relay link 60, and the link rod 61, and only when the elevating lever 54 is at the "planting" position. Is set to "ON", and "OFF" at other operation positions, the correlation between the operation position of the elevating lever 54 and the planting clutch 13 is set.

From the elevating lever 54, a restraining rod 62 is pivotally extended rearward, and is supported by a rotating boss 63 provided on a lower link 3a of the quadruple link mechanism 3. When the raising / lowering lever 54 is operated to the “up” position and the seedling planting device 4 is raised to a predetermined upper limit position, the rotating boss 63 applies a spring 65 to a stopper 64 provided on the restraining rod 62. The lifting rod 54 in the “up” position is forcibly pushed back to the “neutral” position to stop the lifting automatically.

A sensitivity adjusting lever 66 for setting the sensitivity of the elevating control is provided at a position behind the elevating lever 54 inside the body so as to be able to swing back and forth about a fulcrum d and to be fixed at an arbitrary operation position. In addition, a wire support arm 67 rotatable around a fulcrum e is provided at a position behind the control valve 50, and an upper end of the wire support arm 67 and the sensitivity adjustment lever 66 serve as a rod as a linking member. 68, the sensitivity adjusting lever 66 is swung back and forth to be fixed at an arbitrary operation position, so that the fixing posture of the wire support arm 67 is adjusted. The front end of the outer wire 43b of the sensor wire 43 is supported by the lower end of the wire support arm 67, and the front end of the inner wire 43a extending forward from the sensor wire 43 is connected to the lower end of the sensing lever 53. Have been.

The upper half of the wire support arm 67 is connected to an outer wire 70b of a sensitivity adjusting release wire 70 for pulling an auxiliary sensor spring 69 connected to the upper end of the sensing lever 53 of the control valve 50. . The release wire 70 is linked to a speed change lever 71 arranged on the left side of the driver's seat 9. As the speed change lever 71 operates the continuously variable transmission 12 to a high speed side, the auxiliary sensor spring 69 is released. The inner wire 70a is pulled by the inner wire 70a.

The automatic raising and lowering control of the seedling planting apparatus 4 is performed by operating the raising / lowering lever 54 to the “down” position or the “planting” position and moving the contact pin 56 of the operating arm 55 to the operating lever 52.
In this case, the sensing lever 53 of the control valve 50 is operated only by the sensor wire 43. In the “down” position, automatic raising / lowering control is performed when the planting clutch 13 is in the “off” state, and in the “planting” position, the planting clutch 13 is “on”
Automatic lifting control in the state is performed as follows.

When the raising / lowering lever 54 is operated to the "down" position while the seedling planting device 4 is floating above the rice field, in this case, the grounding sensor S swings downward around the fulcrum a by its own weight, and the sensor wire Since the inner wire 43a of 43 is loosened, the operating lever 52 in the free state is rotated counterclockwise in the figure by the biasing power thereof, the control valve 50 is switched to the lowered state, and the seedling planting device 4 is lowered. To start.

In FIG. 5, when the seedling planting device 4 descends and the ground contact sensor S touches the rice field, the ground contact sensor S swings upward around the fulcrum a by the ground reaction force, and the rod 41 pushes up the sensor. The arm 40 is swung counterclockwise around the fulcrum b, whereby the sensor wire 4
The rear end of the inner wire 43a at 3 is pulled out.

In FIGS. 8 and 9, the inner lever 43a is pulled out rearward, so that the sensing lever 53 is provided.
Is rotated clockwise, and the operation lever 5 is in the lowered position.
2 is rotated clockwise by contact with the pin 72 provided on the sensing lever 53, and eventually the interior spool is neutralized and the lowering of the seedling planting device 4 is stopped. This state is the neutral reference state of the elevation control, and the ground reaction force acting on the ground sensor S at this time and the force (sensor load) for pressing the ground sensor S downward by the sensor spring 45 and the auxiliary sensor spring 69 are balanced. ing.

By operating the raising / lowering lever 54 to the "planting" position with the seedling planting device 4 being lowered and grounded, the planting clutch 13 is engaged and planting work becomes possible.

During the planting run, the seedling planting apparatus 4 rises or sinks with respect to the rice field due to the vertical movement or tilting of the traveling machine body 1 due to the unevenness of the cultivator. The vertical displacement is sensed, and the seedling planting apparatus 4 is automatically moved up and down as described below.

In the state in which the above-described lifting control is stabilized at the neutral reference state, for example, the traveling machine 1
When the entire body is lifted or the traveling body 1 rises and tilts due to the unevenness of the cultivator, and the seedling planting device 4 starts to float, the ground reaction force acting upward on the ground sensor S causes the ground sensor S to move downward. And the grounding sensor S is displaced downward and the sensor wire 43 is pressed.
8 and 9, the sensing lever 53 is in a freely rotating state, and the operation lever 52 is urged and rotated counterclockwise to perform a descending control. When the ground reaction force acting upward increases and balances with the sensor load, it returns to the original neutral reference state again,
Here, the descending operation stops.

Further, in a state where the lifting control is stabilized at the neutral reference state, for example, the entire traveling machine body 1 sinks into a deep part of the cultivator, or the traveling machine body 1 descends due to unevenness of the cultivator. When the seedling planting device 4 is about to sink due to the inclination or the like, the ground reaction force acting upward on the ground sensor S becomes larger than the sensor load pressing the ground sensor S downward, and the ground sensor S is displaced upward. Sensor wire 4
3 is pulled, and the inner wire 43a of FIG.
, The sensing lever 53 is rotated clockwise by pulling the inner wire 43a backward,
2 is forcibly rotated clockwise through the pin 72 to perform the ascent control, and when the ground reaction force acting on the ground sensor S decreases and becomes balanced with the sensor load, the neutral reference state is returned to the original neutral reference state again. Here, the lifting operation stops.

Further, the sensor sensitivity is changed and adjusted as described below in accordance with the hardness of the mud in the field, and the elevation control with a suitable sensitivity is performed. For example, when the mud in the field is soft, the sensitivity adjustment lever 66 is adjusted forward and the wire support arm 67 is rotated clockwise in FIG. As a result, the front end position of the outer wire 43b in the sensor wire 43 is changed rearward, and the inner wire 43a of the sensor wire 43 is adjusted to be pulled forward relative to the control valve 50 in the neutral reference state. On the S side, the state in which the inner wire 43a is pulled is the reference state, and in FIG.
0 is stabilized in a state rotated clockwise from before the adjustment, and the reference attitude of the grounding sensor S is changed to a forward downward direction from before the adjustment.

When the reference attitude of the ground sensor S is changed to the forward lower side, the center moves forward from the fulcrum a to the ground area of the ground surface of the ground sensor S with respect to the field surface, and swings upward due to the ground reaction force from the field surface. Easier to do. In addition, the sensor arm 40 is changed to a state in which the sensor arm is rotated clockwise from before adjustment, so that the sensor spring 45 becomes longer.
, The downward sensor load is reduced. 8, the front end position of the outer wire 70b of the release wire 70 is displaced forward by adjusting the rotation of the wire support arm 67 in the clockwise direction.
9, the sensor load acting downward on the ground sensor S is smaller than before adjustment. Therefore, by adjusting the sensitivity adjustment lever 66 forward, the control sensitivity becomes sensitive, and the ground sensor S is easily displaced even by a small fluctuation of the ground reaction force. The subsidence of the seedling planting apparatus 4 can be reliably detected without sinking deeply.

Conversely, when the mud in the field is hard, the sensitivity adjusting lever 66 is adjusted backward, and the wire support arm 67 is rotated counterclockwise in FIG. Thereby, the outer wire 43 in the sensor wire 43
b, the front end position is changed forward, the inner wire 43a of the sensor wire 43 is adjusted to the slack side relative to the control valve 50 in the neutral reference state, and the inner wire 43a is extended on the grounding sensor S side. In FIG. 5, the state in which the sensor arm 40 is rotated counterclockwise from before the adjustment is stabilized, and the reference posture of the ground sensor S is changed to a forward-upward direction before the adjustment in FIG.

When the reference posture of the ground sensor S is changed to the forward ascending side, the center of the ground sensor S approaches the fulcrum a side with respect to the ground surface with respect to the rice field, and it is difficult to swing upward due to the ground reaction force from the rice field. Become. Further, in FIG. 5, the sensor arm 45 is changed to a state of being rotated counterclockwise from before the adjustment, so that the sensor spring 45 is compressed and deformed, and the downward sensor load by the sensor spring 45 increases. In FIG. 8, the front end position of the outer wire 70b of the release wire 70 is displaced rearward by the rotation adjustment of the wire support arm 67 in the counterclockwise direction, the sensor load by the auxiliary sensor spring 69 increases, and the grounding as a whole. The sensor load acting downward on the sensor S becomes larger than before the adjustment. Therefore, by adjusting the sensitivity adjusting lever 66 backward, the control sensitivity becomes insensitive, and the grounding sensor S does not displace even by a slight ground pressure fluctuation,
A stable grounding state is maintained without unduly responding to slight irregularities on the rice field.

Incidentally, as the traveling speed of the traveling body 1 increases, the apparent ground reaction force increases due to the mud pushing reaction force acting on the ground sensor S from the front, and the ascending control is performed to set the planting depth to the target depth. It will be shallower than it is,
As the shift lever 71 is adjusted to the higher speed side, the auxiliary sensor spring 69 is pulled and linked so that the sensor load becomes larger, so that unreasonable ascending control is not performed by high speed running, regardless of the running speed. A stable planting depth is maintained.

The elevating lever 54 and the sensitivity adjusting lever 66 are provided integrally with a lever guide 7 formed on the left side of a resin-made fendide 75 disposed below the driver's seat 9.
6, and through a guide plate 77 made of a metal plate disposed along the lower side thereof,
Both levers 54 and 66 are configured to be able to bend sideways via intermediate fulcrums f and g. Here, as shown in FIG. 11, the lever guide groove 78 formed in the lever guide 76 has an operation groove portion 78a of the elevating lever 54 and an operation groove portion of the sensitivity adjustment lever 66 deviated to the driver's seat side. 78b, and both operation groove portions 78a,
78b is wrapped back and forth, and the operation groove portions 78a and 78b are set in a shape where they are communicated with each other at the wrapped portion.

On the other hand, the guide plate 77 has
A notched operation that guides the stepped operating groove 79 that can operate the elevating lever 54 in the range from the “elevated” position to the “planting” position and the sensitivity adjusting lever 66 and locks and fixes the operating lever at an arbitrary operating position A groove 80 is formed.

The bracket 81 for pivotally connecting the wire support arm 67 is provided on a pipe-made horizontal frame 84 horizontally and horizontally mounted on the rear end of a vertical frame 83 erected at the rear of the body frame 82. , This horizontal frame 84
The rear end of the fendide 75 is supported at
At both left and right ends of the horizontal frame 84, auxiliary steps 85 for climbing up when supplying seedlings to the seedling rest 18 are provided with fenders 7.
5 are mounted so as to be located on the left, right, lateral and outer sides.

As shown in FIG. 8, a plurality of connection holes 86 for connecting the rod 68 are provided at the upper end of the wire support arm 67 in the longitudinal direction of the arm. Is selected to change the lever ratio, so that the ratio of the adjustment amount of the sensor load to the total operation amount of the sensitivity adjustment lever 66 can be changed and adjusted.

Further, the rod 68 is provided with a screw expansion / contraction portion 87.
The length of the rod 68 can be adjusted, and by adjusting the length of the rod 68, the adjustment range of the sensor load with respect to the entire operation amount of the sensitivity adjustment lever 66 can be changed. A cover 88 is provided above the rod 68 so as to be cantilevered from the fender 75 toward the rear, and the fertilizer spilled from the fertilizer falls onto the rod 68 and the wire support arm 67. This prevents the components from sticking and prevents the components from being easily rusted due to the attachment of the fertilizer.

The lever guide 76 is commonly used as a lever guide of a model having a specification for electrically controlling the elevation control and the continuously variable transmission 12, and a control system according to the specification is schematically shown in FIG. Have been.

That is, in this specification, an electromagnetic control valve 90 is used as a control valve for operating the hydraulic cylinder 2, and the lift lever 54 is connected to the potentiometer 9
1, the operation position is continuously detected. Similarly to the above-mentioned mechanical lift control device, when the lift lever 54 is in the "neutral" position, the electromagnetic control valve 90 is in the neutral state, and In the "position", the electromagnetic control valve 90 is switched to the up state, and in the "down" position and the "planting" position, the electromagnetic control valve 90 is controlled based on the detection signal from the potentiometer 92 for detecting the vertical displacement of the ground sensor S. The automatic elevating control is performed. This automatic raising / lowering control is to control the operation of the electromagnetic control valve 90 via the control device 93 so that the detection signal from the potentiometer 92 becomes a preset target value. Sensitivity adjuster 94
By changing the target value, the neutral reference attitude of the ground sensor S is changed to adjust the control sensitivity.

The planting clutch 13 is driven to be turned on and off by the electric motor 95, and the planting clutch 13 can be turned on and operated only at the "planting" position as in the mechanical type. Further, the continuously variable transmission 12 is provided with an electric cylinder 97 provided with a stroke sensor 96 for feedback.
And an operation command is issued by a speed setting device 98 using a potentiometer.

In this specification, as shown in FIG. 13, a guide plate 77 provided below the lever guide 76 has a lever guide groove 78 of the lever guide 76.
A series of operation grooves 99 are formed in the same shape as the above, and it is possible to operate the elevating lever 54 also at the "automatic" position set at the end of the operation groove part branched from the operation groove part for elevating. It has become. When the lifting lever is operated to the “automatic” position, the seedling planting device 4 can be raised and lowered, and the planting clutch 13 can be turned on and off by the lifting switch lever 101 disposed on the side of the steering handle 100 or the like. .

That is, the lift switch lever 101 is configured to be able to swing up and down and to return to a neutral position. When the planting travel of one stroke is completed and the vehicle reaches the ridge, the lift switch lever 101 is moved upward. When the one-shot operation is performed, the automatic elevating control mode is switched to the forced ascending mode, and the seedling planting device 4 is automatically controlled to ascend to the upper limit, and the planting clutch 13 is also automatically turned off,
In addition, the continuously variable transmission 12 is automatically decelerated to the lowest speed.
When the traveling body 1 is turned U-turn around the ridge and the up / down switch lever 101 is operated one shot downward, the mode returns to the automatic up / down control mode, and the seedling planting apparatus 4 automatically descends until it touches the rice field. At this time, the planting clutch 13
When the seedling planting device 4 is touched down and the lifting switch lever 101 is again operated one-shot downward, the planting clutch 13 is controlled to enter and the planting can be returned to a running state again. It is.

The present invention can be modified and implemented in the following forms. The lever for operating the wire support arm 67 is configured so that the connection position between the rod 68 and the sensitivity adjustment lever 66 can be changed in the longitudinal direction of the lever in order to link the sensitivity adjustment lever 66 and the wire support arm 67 with the rod 68. It is also possible to change the ratio. A push-pull wire can be used as a linking member for interlocking the sensitivity adjusting lever 66 and the wire support arm 67. According to this, the sensitivity adjusting lever 66 can be installed at an arbitrary position regardless of the arrangement of the elevating lever 54. Becomes possible.

[Brief description of the drawings]

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

FIG. 2 is an overall plan view of a riding rice transplanter.

FIG. 3 is a side view of the rear part of the fuselage.

FIG. 4 is a rear view of the fertilizer application device.

FIG. 5 is a side view of a grounding sensor unit for elevation control.

FIG. 6 is a perspective view of a detection site.

FIG. 7 is a plan view of a grounding sensor unit for elevation control.

FIG. 8 is a side view of a valve operation unit.

FIG. 9 is a linkage diagram showing a schematic configuration of a lift control device;

FIG. 10 is a plan view of a valve operation unit.

FIG. 11 is a plan view of a guide plate.

FIG. 12 is a block diagram showing a schematic configuration of an electric control system.

FIG. 13 is a plan view of a guide plate used for electric control specifications.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Hydraulic cylinder 4 Seedling plant 43 Sensor wire 50 Control valve 54 Elevating lever 66 Sensitivity adjusting lever 67 Wire support arm 68 Linking member (rod) 76 Lever guide 78a Operating groove part of elevating lever 78b Operating groove of sensitivity adjusting lever Part S Ground sensor

Claims (5)

[Claims] A seedling planting device connected to the rear of a traveling machine so as to be able to move up and down is provided with a grounding sensor that is vertically displaced in accordance with a change in grounding pressure, and a control valve of a hydraulic cylinder that drives the seedling planting device up and down. Disposed on one side of the driver's seat, the grounding sensor and the control valve are interlocked and connected via a sensor wire, and the control valve is actuated based on the vertical displacement of the grounding sensor. A lift control device for maintaining the height with respect to the rice field within a certain range is configured, and a lift lever for operating the control valve and a reference state of the sensor wire are changed to change and adjust a reference attitude of the ground sensor. In a riding rice transplanter provided with a sensitivity adjusting lever, a wire support arm for supporting the sensor wire is provided at a position behind the control valve in the fuselage. A riding rice transplanter, wherein the wire support arm and the sensitivity adjusting lever are interlockingly connected via a linking member. 2. In a position behind the driver seat in the traveling vehicle body, the vehicle body is positioned above the wire support arm,
The riding rice transplanter according to any one of claims 1 to 3, further comprising a fertilizer supply unit of the fertilizer application device. 3. The riding rice transplanter according to claim 1, wherein a connection position of a linking member for linking the wire support arm and the sensitivity adjustment lever to the wire support arm or the sensitivity adjustment lever is adjustable. . 4. The apparatus according to claim 1, wherein the lifting lever and the sensitivity adjusting lever are arranged side by side on the left and right, and an operation area of the lifting lever and an operation area of the sensitivity adjusting lever overlap each other. The rice transplanter according to the above section. 5. The device according to claim 1, wherein the lifting lever and the sensitivity adjusting lever are provided so as to protrude from a common lever guide, and the operation grooves of the levers formed on the lever guide communicate with each other. A riding rice transplanter according to one of the preceding claims.