JP2005333817A - Rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice transplanter solving the problem involved in conventional rice transplanters that, when a key switch or the like is operated in a condition that, for example, a lift lever is at a position except "neutral", i.e. "planting", "lowering" or "lifting", a hydraulic system making a lift control of a planting section is also operated, therefore the planting section undergoes a lift operation corresponding to the position of the lift lever, however in this case, when an engine starts in a condition that the lift lever is at a position other than "neutral", the planting section is subjected to left control in a status that a relevant operator is not concerned or intended, therefore being improper. <P>SOLUTION: The rice transplanter is so designed that, in subjecting a planting section 4 for planting seedlings in a farm to lift control according to the angle of the float of the rice transplanter and/or a lift lever 91, the planting section 4 can be subjected to lift control in response to the operation of the lift lever 91 only when the lift lever 91 is at the position of making the planting section 4 neutral in starting an engine 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technology of a rice transplanter that performs up-and-down control of a planting unit for planting seedlings in a farm field according to a float angle and a lifting operation lever.

2. Description of the Related Art Conventionally, there is a rice transplanter that controls raising and lowering of a planting unit for planting seedlings in a farm field in accordance with a float angle and a raising / lowering operation lever (hereinafter simply referred to as “elevating lever”).
An example of such a rice transplanter is shown in the following Patent Document 1.
Specifically, the rice transplanter disclosed in Patent Documents 1 and 2 appropriately controls the seedlings in the field by automatically raising and lowering the planting part based on the angle of the float that contacts the field during planting work. It describes a rice transplanter that can be planted.
Moreover, the rice transplanter shown by patent documents 1 and 2 raises / lowers a planting part by the time of the raising / lowering lever provided in order to raise / lower a planting part manually, when a rice transplanter stops, etc. It is also a thing.

JP-A-6-339309 JP 2000-175520 A

However, the rice transplanter as described above may be inconvenient in the following points.
In general, the lift lever is used to set a planting part, for example, “planting” (the planting part is set to a height for planting seedlings), “down” (decreasing the height of the planting part), “neutral” ( One of the four operations of “up” (in which the height of the planting part is increased) is performed.
The above four operations correspond to the positions of the lift levers, and the operator can perform a desired operation by positioning the lift levers at the corresponding positions.
Therefore, the conventional rice transplanter has a key for starting the engine of the rice transplanter, for example, in a state where the elevating lever is in any of the “planting”, “lowering”, and “upward” positions other than the above “neutral”. When the switch or the like is operated, the hydraulic system that controls the raising / lowering of the planting unit is also activated by starting the engine, so that the planting unit performs an elevation operation corresponding to the position of the elevation lever.
Specifically, when the key switch is turned off while the elevating lever is in the “up” position, the oil pressure may decrease as time passes and the planting part may move down.
Further, when the key switch is turned on in this state and the engine is started, the hydraulic system is also activated, and the planting portion is unexpectedly raised corresponding to the position of the lifting lever.
In addition, when performing lift control using an electromagnetic valve in the hydraulic system, since the lift operation cannot be performed unless the key switch is turned ON, the engine is operated by turning the key switch OFF at the position where the planting part is raised. If only the raising / lowering operation lever is mistakenly set to the “down” position after stopping, the planting part will be lowered unintentionally at the next engine start.
That is, when the engine is started in a state where the lifting lever is in a position other than “neutral”, the planting unit is lifted or lowered in a situation not known or intended by the operator.
It is often inconvenient for the operator or the like to perform the raising / lowering operation of the planting part in a situation that the operator is not aware of or intends.
In addition, during planting work, an abnormality may occur in the planting portion or the like, the engine may be stopped, the vehicle may get off, and the planting portion or the like may be inspected.
If the engine is started to perform planting again after the inspection, deep planting or shallow planting, floating seedlings, mud pushing, etc. will occur unless the planting operation is continued at the planting height before the engine is stopped. Resulting in.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  In Claim 1, based on the angle detection means which detects the angle of a float, and the operation position detection means which detects the operation position of a raising / lowering operation lever, the rice transplanter which raises / lowers the planting part for planting a seedling in a farm field The lifting / lowering control of the planting part can be performed according to the operation of the lifting / lowering control lever after the engine is started only when the lifting / lowering control lever is in a position to neutralize the planting part when the engine is started. is there.

  In Claim 2, when the said raising / lowering operation lever exists in the position of planting, raising, and descending other than the position which makes the said planting part neutral, the raising / lowering control of a planting part is not performed. is there.

  In Claim 3, based on the angle detection means which detects the angle of a float, and the operation position detection means which detects the operation position of a raising / lowering operation lever, the rice transplanter which raises / lowers the planting part for planting a seedling in a farm field , In the state where the float is in contact with the field, and when the elevating operation lever is in the position for planting the seedling in the field or the position for the lowering operation, the planting part is controlled to be lifted based on the float angle. It is.

  As effects of the present invention, the following effects can be obtained.

According to the configuration of claim 1, since it is possible to control the raising and lowering of the planting part only when the raising and lowering operating lever is in the position for neutralizing the planting part, the lifting and lowering operation lever is in a position other than the position for neutralizing the planting part. Even when the key switch for starting the engine is operated in the position, it is possible to prevent a situation in which the lifting control of the planting unit is suddenly started.
That is, it is possible to prevent the planting unit from being lifted and lowered unexpectedly when the operator does not intend.

  According to the configuration of claim 2, specifically, the position at which the elevating operation lever “plants”, “rises”, or “lowers” the planting part is a position other than the position at which the elevating operation lever neutralizes the planting part. In this case, it is possible to prevent a situation in which the raising / lowering control of the planting unit is suddenly started.

  According to the configuration of claim 3, even if the seedling planting operation is temporarily interrupted while the float is grounded and the engine is stopped, the engine is restarted and restarted before the planting operation is interrupted. It becomes possible to automatically start seedling planting work in this state.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following best mode for carrying out the present invention is an example embodying the present invention, and is not intended to limit the technical scope of the present invention.
1 is a schematic configuration diagram showing the appearance of a riding rice transplanter according to the best mode for carrying out the present invention, FIG. 2 is a side view of the riding rice transplanter shown in FIG. 1, and FIG. 3 is an operation in the vicinity of the steering handle 14. FIG. 4 is a side view of the schematic configuration diagram of FIG. 3, FIG. 5 is a block diagram relating to lifting control of the planting unit 4, and FIG. 6 is a schematic diagram of control of the riding rice transplanter. FIG. 7 is a flowchart showing an outline of control of the riding rice transplanter, and FIG. 8 is a graph showing a relationship between a float angle of the riding rice transplanter and an output voltage of a sensor for detecting the float angle.

<Overall configuration>
First, the whole structure of the rice transplanter which concerns on the best form for implementing this invention is demonstrated using FIG.1 and FIG.2.
The rice transplanter of the present embodiment is, for example, an 8-row riding rice transplanter, and the planting part 4 is mounted on the rear part of the traveling machine body (traveling part) 1 via the lifting link mechanism 27.
In the traveling unit 1, the engine 2 is mounted above the front part of the body frame 3, the front wheel 6 is supported at the front lower part via the front axle case 7a, and the rear wheel 8 is provided at the rear part via the rear axle case 7. I support it.
The engine 2 is covered with a bonnet 9, preliminary seedling platforms 10 and 10 are disposed on both sides of the bonnet 9, and a steering handle 14 is disposed on the dashboard 5 at the rear of the bonnet 9.
Both sides of the bonnet 9 and the rear body frame 3 are covered with a body cover 12.
A seat 13 is disposed at a rear position of the steering handle 14, and both sides of the bonnet 9 and the front portion of the seat 13, both right and left sides of the seat 13, and the rear of the seat 13 are steps.
Further, an eight-way fertilizer applicator 33 is disposed behind the seat 13.

<Planting part 4>
The planting part 4 provided at the rear part of the traveling part 1 is attached to the seedling stage 16, rotary cases 22, 22... Provided at the rear part of the planting transmission case serving as a planting claw support part, and the rotary case 22. Planted claws, a center float 34, a side float 35, and the like.
The seedling stage 16 is disposed in front and rear and low, and the lower part of the seedling stage 16 is supported by the lower guide rail 18 and the upper part of the front surface by the upper guide rail 19 so as to be slidable in the left-right direction.
The lower guide rail 18 and the upper guide rail 19 are supported by a planting center case 20 via a planting frame 23 and the like.
Then, a connecting pipe (not shown) is projected from the planting center case 20 to the left and right sides, a transmission case (not shown) is fixed, the transmission case is projected rearward in parallel, .. Are arranged on both sides of the rear part of the transmission case, and planting claws are provided on the rotary cases 22.
Since one set of the rotary cases 22, 22... Is provided for one seedling mounting table 16, eight rotary cases are provided in the case of the above-mentioned 8 rice transplanters.
Further, the elevating link mechanism 27 is connected to the front portion of the planting center case 20 via a rolling fulcrum shaft, and the elevating link mechanism 27 includes a top link 25, a lower link 26, and the like. The planting part 4 can be moved up and down by a lifting cylinder (not shown; an example of a lifting drive mechanism) composed of a hydraulic cylinder serving as an actuator.

<Float>
A center float 34 and a side float 35 are supported below the planting center case 20 and the planting transmission case connected to the rear portion of the elevating link mechanism 27 via a link mechanism.
As an example of an angle detection means for detecting the rotation angle (absolute angle) of the center float 34 (or side float 35), an angle sensor 80 is disposed in the vicinity thereof via a rotation portion or an arm of the link mechanism. Has been. As the angle sensor 80, a potentiometer, a rotary encoder, or the like is used.
The angle sensor 80 is connected to a control unit 100 to be described later, and controls the raising and lowering of the planting unit 4 in accordance with a change in the float angle.
Further, markers 40 and 40 are disposed on both the left and right sides of the connecting pipe.
Since the rice transplanter is configured as described above, the seedling mounting table 16 is reciprocated to the left and right as the vehicle travels forward, and the planting claws are driven in synchronism with this reciprocation in each strip. It is possible to cut out the seedlings of the minute and perform the planting work continuously.

<Driver seat>
Although not clearly shown in FIG. 1 and FIG. 2 because of the scale of the drawings, an operating system such as a lever and a switch as shown in FIG. 3 is provided in the vicinity of the dashboard 5 in detail.
Note that FIG. 3 shows a state in which main parts related to the operation system in the vicinity including the dashboard 5 in FIGS. 1 and 2 are extracted, and drawing of parts not related to the operation system is omitted.
On the rear side of the dashboard 5 (the seat 13 side), a steering handle 14 is provided at the center in the left-right direction.
That is, a dashboard 5 and a steering handle 14 are provided on the front side of the seat 13, and electrical operating means (switches) and levers related to planting work of the planting unit 4 are provided near the steering handle 14. Kinds are arranged.
As specific examples of the electric operation means, a planting depth setting SW 61, a field hardness setting SW 62, a work selection SW 63, and a seedling joint SW 64 are arranged (here, “SW” means “switch”). The same shall apply hereinafter.
As the levers, an operation region 90b such as a main transmission lever 94 is provided in the vicinity of the left side of the dashboard 5 with respect to the steering handle 14, and on the other hand, the dashboard 5 In the vicinity of the right side, an operation area 90a such as a cruise control lever 92, an accelerator lever 93, and a lifting lever 91 for manually lifting and lowering the planting unit 4 is provided.
As shown in FIG. 3, the operation areas 90a and 90b are provided with guide grooves 91a, 92a, 93a, and 94a that define the swing ranges and holding positions of the levers.
Further, the operation areas 90a and 90b may be made of a member separated from the dashboard 5 as shown in FIG. 3, or may be formed integrally with the dashboard 5. Good.
A key SW 65 for inputting the start of the engine 2 is provided on the side surface of the seat 13 below the dashboard 5.
The key SW 65 also has a function of turning on a power source for supplying power to a cell motor for starting the engine 2 and a control unit.

<Operation area>
The lifting lever 91 in the operation area 90a will be described with reference to FIG.
As described above, the elevating lever 91 is used to elevate and lower the planting unit 4 by being directly operated manually by a user, and is provided conventionally.
For example, as shown in FIG. 4A, the elevating lever 91 is fixed to a shaft 72a whose swing base is pivotally supported in the operation region 90a, and an arm 71a is fixed to the shaft 72a. ing.
Similarly, further below the shaft 72a and the arm 71a, a shaft 72b that is pivotally supported in parallel with the shaft 72a inside the operation region 90a and an arm 71b fixed to the shaft 72b are provided. A link 74 projects from the shaft 72b.
Further, the end portions of the link 73 are pivotally connected to the end portions of the two arms 71a and 71b, respectively, and the arms 71a and 71b are arranged substantially parallel to form a parallel link.
A rotary SW 70 is provided at an intermediate position in the vertical direction between the arm 71a and the arm 71b.
A substantially U-shaped U-shaped link 70 a is fixed to the rotary shaft of the rotary SW 70.
The end of the link 74 is engaged with the U groove of the U-shaped link 70a, and the end of the link 74 is slidable within the groove of the U-shaped link 70a. .
Since the link 74 slides on the inner surface side of the U-shaped link 70a, the position of the U-shaped link 70a (that is, the angle with respect to the rotary axis) changes, so that the rotary SW 70 rotates. The shaft is configured to rotate.

<Elevating lever 91, rotary SW 70>
In the configuration as described above, for example, the state of the elevating lever 91 shown in FIG. 4A shows a state pulled to the foremost side (that is, a state pulled to the rear side).
In this state, the position of the U-shaped link 70a fixed to the rotary shaft of the rotary SW 70 is assumed to be the position shown in FIG.
The rotary SW 70 has, for example, four contacts as shown in FIG. 4B, and the contacts corresponding to the four contacts are connected to the control unit 100 (see FIG. 5). Are set in advance as “up”, “neutral”, “down”, and “planting” at the position of the U-shaped link 70a.
That is, the rotary SW 70 is an example of an operation position detection unit that detects the operation position of the elevating lever 91.
Further, since the control unit 100 to be described later is connected to the lifting / lowering cylinder driving unit 200, it is possible to drive the lifting / lowering cylinder (for example, hydraulic type) to drive the planting unit 4 to a desired position. ing.
That is, when the U-shaped link 70a is in the “up” position, the planting portion 4 is raised. When the U-shaped link 70a is in the “neutral” position, the planting portion 4 does not operate and remains in a neutral state. The planting part 4 descends when it is in the position of "planting", and when it is in the "planting" position, the planting clutch of the planting part 4 becomes "ON" and the planting claws are driven to plant seedlings. To start.
Consider the case where the rotary SW 70 is set in advance as described above and the lifting lever 91 is pushed in the direction of the thick arrow (forward direction of the riding rice transplanter) in FIG. 4A in the state shown in FIG.

Note that the thick arrow direction of each part in FIG. 4A indicates the operation direction corresponding to the operation of the lifting lever 91 in the thick arrow direction.
In this case, the arm 71a fixed to the shaft 72a that is the swing base of the lifting lever 91 rotates (in the direction of the thick arrow), so that the link 73 moves (in the direction of the thick arrow). Rotates (in the direction of the thick arrow).
At this time, the link 74 fixed to the shaft 72b slides on the inner surface side (in the groove) of the U-shaped link 70a, so that the rotary shaft of the rotary SW 70 rotates in the direction of the thick arrow.
Therefore, the position of the U-shaped link 70a moves in the order of “up” → “neutral” → “down” → “planting”, and the manual control of the planting unit 4 is switched in this order.
Of course, by operating the lifting lever 91 in the reverse direction, manual control of the planting unit 4 can be switched in the order of “planting” → “down” → “neutral” → “up”.

<Switches>
Here, the planting depth setting SW 61, the field hardness setting SW 62, the work selection SW 63, and the seedling joint SW 64 described above will be described.
The planting depth setting SW 61 is a volume type switch for setting the planting depth when a seedling is planted in the field.
That is, the planting depth setting SW 61 is an example of a planting depth setting unit for setting the planting depth of the planting unit 4.
The volume type switch has a method of adjusting by rotating the switch as shown in FIGS. 3 and 4, and is also called “dial type”. Therefore, here, the description will be made assuming that the volume type includes the meaning of the dial type.
The field hardness setting SW 62 is a volume type switch for setting and inputting control sensitivity and the like based on information such as the field hardness obtained by the user.
That is, in other words, the field hardness setting SW 62 determines the degree of sensitivity (sensitivity to insensitivity) of the lifting control when the planting unit 4 is controlled to be lifted based on the detection values of the sensors such as the angle sensor 80. The setting is input manually.
The “float sensitivity” specifically refers to the control target angle of the float. Setting the control target angle of the float to “downward” corresponds to “sensitive”, while the control target angle of the float. Making “going forward” corresponds to “insensitivity”.

The work selection SW 63 is a volume type switch for setting the riding rice transplanter so that the work corresponding to the state of the field can be performed by inputting the state of the field. Specific examples of the field situation include “standard”, “deep water”, and “headland”.
“Standard” means that the riding field transplanter is a standard field that can be performed without executing special control when performing planting work (standard mode).
“Deep water” means that the amount of water (depth) in the field is large compared to the above standard (deep water mode).
“Headland” means that when the amount of water (depth) in the field is small compared to the above standard, or the field condition is poor compared to the central part of the field (there is a lot of unevenness, for example, turning at the field edge) This means the case where there are many irregularities in the farm scene (field surface) due to tires (headland mode).
In addition, the deep mud mode in which mud pushing occurs frequently and the dust mode in which a lot of dredging and foreign substances are floating are conceivable. The target values of planting depth and planting sensitivity according to the situation and state of the field. Can be changed by the work selection SW 63.
When the planting part 4 rises, the seedling joint SW 64 does not raise the planting part 4 to the top so that the seedling can be easily carried out, and the elevation is set at a predetermined height for seedling joint work. It is a switch for automatically stopping the operation, and is a push-type switch for detecting a press by the user.
In this way, by setting only the switch of the seedling SW 64 as a push type different from the other switches, it is possible to alert the user that the seedling SW 64 is the seedling SW 64 and one-touch seedling switching. Since the function activated by the SW 64 can be started, the handling is easy and convenient.
Further, the seedling SW 64 may be provided with a lamp, a light emitting diode, or the like, for example, when the lamp or the light emitting diode shines when operated (pressed) by a user or the like. You may make it notify a user that the planting part 4 is in a stop state with the said predetermined height.

<Control system>
For example, as shown in FIG. 5, the control unit 100 that performs overall control of the riding rice transplanter includes a rotary SW 70, a planting depth setting SW 61, a field hardness setting SW 62, a work selection SW 63, a seedling joint SW 64, a key SW 65, and various types. An angle sensor 80 for detecting an angle change of the sensor 300, the center float 34, etc., an elevating cylinder driving unit 200 for driving an elevating cylinder for elevating the planting unit 4, a ramp (monitor lamp) 110, and a vehicle speed of the traveling unit 1 are detected. A vehicle speed sensor 83 and the like are connected.
The control unit 100 controls the entire riding rice transplanter based on information acquired from the above-described units (switches, sensors, etc.) and the contents set and stored in advance in the control unit 100.
Further, the control unit 100 is sufficient if it has a function of controlling the entire riding rice transplanter as described above, and therefore may be provided at any place on the riding rice transplanter as long as the function is not restricted. .
Further, a position sensor 81 for detecting information such as the height, expansion and contraction, inclination, etc. of the lifting cylinder may be provided in the lifting cylinder (not shown), the lifting link mechanism 27, the lifting cylinder driving unit 200, and the like.
That is, the position sensor 81 detects information such as the expansion / contraction of the elevating cylinder and the position of the planting part. And the position sensor 81 for detecting the position of the planting part 4 is connected to the control part 100. FIG.
Specific examples of the various sensors 300 include meanings of various sensors such as a tilt sensor for detecting the tilt angle in the front-rear direction of the rice transplanter and a sensor for detecting the engine speed and the like. It is a waste.

<General lifting control of the planting part 4>
Next, an example of the raising / lowering control of the planting part 4 of a riding rice transplanter is demonstrated using the flowchart of FIG. 6, FIG.
In addition, the control subject in the control described below may be the control unit 100 that controls the overall control of the riding rice transplanter, or a dedicated control unit that specializes and controls only the planting unit 4. If provided separately, the dedicated control unit may be used.

Here, it is assumed that the control unit 100 starts the control from the state where the raising / lowering control of the planting unit 4 is not performed after the processing of the start control (step S90) of the riding rice transplanter.
In step S20, the control unit 100 sets the planting clutch in a neutral state in which the planting clutch 4 is not engaged and the planting unit 4 is not lifted or lowered (S20).
That is, this step S20 can be said to be a neutral mode in which the raising / lowering operation of the planting unit 4 is stopped.
In the process of step S20, for example, when the position of the U-shaped link 70a is “down” by operating the lifting lever 91, the process proceeds to step S30, while the position of the U-shaped link 70a is “ In the case of “rising”, the process proceeds to step S10.

In the process of step S10, the control unit 100 raises the planting unit 4 while disengaging the planting clutch (S10).
That is, this step S10 can be said to be an ascending mode for raising the planting part 4.
Moreover, you may call a user's attention by providing the display part etc. which are provided in a riding rice transplanter with the display lamp which displays that it is the said raise mode.
In the process of step S10, the planting unit 4 is determined in advance when “the position of the U-shaped link 70a is“ neutral ”or other switch is pressed” or “the seedling joint SW 64 is pressed”. If it is determined that the predetermined height has been reached, the process proceeds to step S20 to be in a neutral state (ie, stopped).
On the other hand, in the process of step S10, when the position of the U-shaped link 70a is “down”, the process proceeds to step S30.

In the process of step S30, the control unit 100 controls the planting clutch when the planting unit 4 performs the lowering control and the planting clutch is in the disengaged state, and the position of the U-shaped link 70a is “planting”. On the other hand, in the case where the lowering control of the planting part 4 is performed and the planting clutch is in the engaged state, when the position of the U-link 70a becomes “neutral”, the planting clutch is brought into a disconnected state (S30).
That is, this step S30 can be said to be a lowering mode for lowering the planting part 4.
Further, when the lowering control of the planting unit 4 is performed and the planting clutch is in the disengaged state, when the position of the U-shaped link 70a becomes “neutral”, the process proceeds to step S20, while the U-shaped link 70a When the position becomes “rising”, the process proceeds to step S10, and when no operation is performed (via the processing path (1)), the process proceeds to step S40 (see FIG. 7).
Furthermore, when the lowering control of the planting unit 4 is performed and the planting clutch is in the engaged state, when the position of the U-shaped link 70a becomes “up”, the process proceeds to the above step S10, and no operation is performed. The process proceeds to step S40 (see FIG. 7) (via the processing path (2)).

In the process of step S40, the control unit 100 performs the neutral control of the planting unit 4 and enters the planting clutch when the position of the U-shaped link 70a becomes “planting” when the planting clutch is in the disengaged state. On the other hand, when the neutral control of the planting unit 4 is performed and the planting clutch is in the on state, the planting clutch is brought into the disengaged state when the position of the U-link 70a becomes “neutral” (S40).
That is, this step S40 can be said to be a ground contact stop mode in which the planting unit 4 is lowered to the field and stopped by the process of step S30.
Further, when the neutral control of the planting unit 4 is performed and the planting clutch is in the disengaged state, when the position of the U-shaped link 70a becomes “up”, the process proceeds to step S10 (via the processing path (3)). If no operation is performed, the process proceeds to step S50.
Further, when the neutral control of the planting unit 4 is performed and the planting clutch is in the engaged state, when the position of the U-shaped link 70a is “raised”, the process proceeds to step S10 (via the processing path (3)). If no operation is performed, the process proceeds to step S50.
In addition, when nothing is operated in the above (from step S40 to step S50), the vehicle speed of the riding rice transplanter is greater than 0, and the ground contact of the center float 34 is maintained for a certain time.
That is, the riding rice transplanter moves while planting seedlings in the field.

In the process of step S50, the control unit 100 controls the raising / lowering of the planting unit 4 and turns on the planting clutch when the position of the U-shaped link 70a is "planting" when the planting clutch is in the disconnected state. On the other hand, when the raising / lowering control of the planting part 4 is performed and the planting clutch is in the engaged state, when the position of the U-shaped link 70a becomes “neutral”, the planting clutch is brought into the disengaged state (S50).
That is, in this step S50, the height of the planting part 4 that is in contact with the field by the process of step S40 is adjusted to the height of the field (change in the unevenness of the field) that changes as the riding rice transplanter moves. It can be said that it is a lift control mode for performing lift control.
Further, when the raising / lowering control of the planting unit 4 is performed and the planting clutch is in the disengaged state, if the position of the U-shaped link 70a becomes “up”, the process proceeds to step S10 (via the processing path (3)). To do.
Furthermore, when the raising / lowering control of the planting unit 4 is performed and the planting clutch is in the engaged state, if the position of the U-shaped link 70a becomes “up”, the process proceeds to step S10 (via the processing path (3)). Transition.
The passenger rice transplanter can perform the rice transplanting work efficiently by performing the series of processes as described above during normal control.

<Elevating lever 91>
As described with reference to FIGS. 3 and 4, the elevating lever 91 performs any one of “planting”, “down”, “neutral”, and “up”.
However, when the elevating lever 91 is in any position of “planting”, “down”, or “up” other than “neutral” that stops the elevating operation of the planting unit 4 at the time of starting the engine, for example. There is a problem that the operator performs the lifting / lowering operation of the planting unit 4 at the same time as the engine is started.
Originally, the above-mentioned problem does not occur if the lift lever 91 is set to the “neutral” position when the engine is stopped or started, but the lift lever 91 is set to the “neutral” position due to carelessness of the operator. You may not be sure that
Therefore, the following control may be performed.
As already described above, the planting unit 4 is connected to the control unit 100.
Furthermore, the control unit 100 is also connected with a key SW 65, a rotary SW 70, and the like.
Therefore, the control unit 100 determines whether the elevating lever 91 is in the “planting”, “down”, “neutral”, or “up” position when starting the engine 2 where the key SW 65 is operated. Is possible.
Therefore, when the control unit 100 detects that the key SW 65 is operated, the control unit 100 determines whether or not the elevating lever 91 is in a neutral position.
And when the control part 100 judges that the raising / lowering lever 91 exists in a "neutral" position, it enables it to perform raising / lowering control of the planting part 4 according to operation of the raising / lowering lever 91 after engine starting. .
That is, in other words, the control unit 100 does not perform the lifting control of the planting unit 4 when the lifting lever 91 is in the positions of “planting”, “down”, and “up” other than “neutral”.
With this configuration, even when the lifting lever 91 is in a position other than “neutral”, the lifting control of the planting unit 4 that is not intended by the operator is performed even when the engine 2 is started. Absent.
Therefore, when the operator or the like has not confirmed the operation position of the elevating lever 91, it is possible to prevent the elevating operation of the planting unit 4 from being suddenly performed.

<When grounded in the field>
By the way, for example, when the operation is interrupted by temporarily stopping the engine during the operation of planting seedlings in the field, the float is in contact with the field, and the lifting lever 91 is “planting” or “lowering” ”.
In this state, when the operator restarts the engine 2 by operating the key SW65, the lifting control (planting or lowering) corresponding to the position of the lifting lever 91 is not performed as described above. If the operation is stopped, the following inconvenience may occur.
In this case, for example, during the operation of planting seedlings in the field, the engine is only temporarily stopped to interrupt the operation, and the operator often performs the operation again immediately. In many cases, the planting operation is started immediately by driving the rice transplanter.
However, in this case, if the raising / lowering operation of the planting unit 4 is not performed, the height of the planting unit 4 does not move up and down corresponding to the unevenness of the field, so that the mud pushing of the float or the planting unit There is a possibility that the planting claws provided in the lower part of 4 come into contact with the convex portions of the farm field, causing inconvenience in the planting operation.
Therefore, the control unit 100 is in the “determination of whether or not the float is in contact with the field from the detection result of the angle sensor 80” and “the lifting lever 91 is in the“ planting ”or“ down ”position. Judgment whether or not.
When it is determined by these two judgments that the float is grounded to the field and the elevating lever 91 is in a position for planting seedlings in the field ("planting" position) or a position for lowering operation ("down" position) The control unit 100 automatically makes it possible to control the raising / lowering of the planting unit 4 based on the angle of the float detected by the angle sensor 80.
By performing such processing, even if the seedling planting operation is temporarily interrupted and the engine is stopped while the float is grounded as in the above example, the engine is restarted and the operation is resumed. In this case, the seedling planting work can be automatically started in a state before the planting work is interrupted.
Therefore, even if the operation is started again, it is possible to prevent mud pushing by the float or a situation where the planting claw comes into contact with the convex portion of the field and causes inconvenience in the planting operation.

Further, the rice transplanter of the present invention may be a rice transplanter having both the above-described functions.
That is, “when the lifting lever 91 is determined to be in the“ neutral ”position, the planting unit 4 is controlled to move up and down according to the operation of the lifting lever 91 after the engine is started” and “the float is grounded to the field. In addition, when the elevating lever 91 is in a position for planting a seedling in a field or a position for a lowering operation, the elevating control of the planting unit 4 is automatically performed based on the angle of the float. You may comprise as a rice transplanter.
By comprising in this way, by setting it as the rice transplanter which has the said 2 function, it becomes possible to exhibit the effect which each function show | played, and to provide the rice transplanter which improved operativity.

<About sensor output>
Next, a specific example of processing in which the control unit 100 detects the float angle will be described.
The relationship between the angle of the float and the output voltage of the angle sensor 80 for detecting the angle of the float will be described with reference to FIG.
The angle sensor 80 uses the principle of a potentiometer, and its output voltage may have a characteristic that it becomes smaller as the angle of the detection target (absolute or relative angle of the float) increases as shown in FIG. .
That is, the two sensors have such characteristics as indicated by the straight line R1 indicating the downward-sloping characteristics shown in FIG.
Here, the characteristics shown in FIG. 8 are described as those of the angle sensor 80.
For example, when the float is in contact with the field, the float angle changes in the range of a to b degrees.
In this case, the output voltage of the angle sensor 80 changes in the range of p to q volts by following the straight line R1.
Therefore, the control unit 100 determines that the float is grounded to the field when the output voltage of the angle sensor 80 is p to q volts.
As described above, the control unit 100 can easily determine whether or not the float is installed on the field by storing the output of each sensor when the float is in contact with the field in advance and using it as a determination criterion. Is possible.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the external appearance of the riding rice transplanter which concerns on the best form for implementing this invention. The side view of the riding rice transplanter shown in FIG. The schematic block diagram which extracted the principal part of the operation system of the steering handle 14 vicinity. The side view of the schematic block diagram of FIG. The block diagram regarding the raising / lowering control of the planting part 4. FIG. The flowchart which shows the outline of control of a riding rice transplanter. The flowchart which shows the outline of control of a riding rice transplanter. The graph which showed the relationship between the angle of the float of a riding rice transplanter, and the output voltage of the sensor which detects the angle of this float.

Explanation of symbols

2 Engine 3 Body frame 5 Dashboard 61 Planting depth setting SW
62 Field hardness setting SW
63 Work selection SW
64 Seedling SW
65 Key SW
80 Angle sensor 83 Vehicle speed sensor

Claims (3)

In the rice transplanter that controls the raising and lowering of the planting part for planting the seedling in the field, based on the angle detecting means for detecting the angle of the float and the operation position detecting means for detecting the operation position of the lifting operation lever,
Only when the lifting control lever is in a position to neutralize the planting part when starting the engine,
A rice transplanter characterized in that the planting part can be lifted and lowered according to the operation of the lifting operation lever after the engine is started.   2. The rice transplanter according to claim 1, wherein when the elevating operation lever is located at any one of planting, ascending and descending positions other than the position where the planting unit is neutral, the rice transplanter according to claim 1 does not perform elevating control of the planting unit. In the rice transplanter that controls the raising and lowering of the planting part for planting the seedling in the field, based on the angle detecting means for detecting the angle of the float and the operation position detecting means for detecting the operation position of the lifting operation lever,
When the float is in contact with the field and the elevating lever is in the position for planting the seedling in the field or the position for the lowering operation,
A rice transplanter that performs lifting control of the planting unit based on a float angle.

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