JP5346367B2 - Paddy field machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the operability of a paddy field working machine by giving many functions to a variable-speed lever of a stepless variable-speed gear to ensure the other operations in association with its travel variable-speed operation to be lightly and swiftly made without shifting lever gripping. <P>SOLUTION: The paddy field working machine is constructed as follows: the variable-speed lever 11 and a speed control mechanism 25 are coordinatedly linked to each other so that the speed control mechanism 25 is operated to a higher-rotation side as the variable-speed lever 11 is operated from its neutral position N to a higher-speed position side in an advancing variable-speed operation path F; the advancing variable-speed operation path F and a reversely advancing variable-speed operating path R are mutually connected in parallel to each other and are deviated in a different-level manner; and a sub-advancing variable-speed operating path F' which is transferrable by a straight-line moving operation to an advancing direction succeeding from the neutral position N(r) of the reversely advancing variable-speed operating path R is collocated on the lateral side of the lower-speed region portion of the advancing variable-speed operation path F. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a paddy field work machine such as a rice transplanter or a paddy direct seeder.

  In recent years, in rice transplanters, hydrostatic continuously variable transmissions (HST) and belt-type continuously variable transmissions have been introduced as travel transmissions in place of gear shift types.

  The introduction of the continuously variable transmission can be easily performed without requiring the operation of the main clutch, unlike the gear shift type transmission, and can be started at zero speed especially in the hydraulic type. Yes, it is effective in improving the shift operability, but various operations other than traveling shift are to operate different operating tools, and other operations are performed in relation to the traveling shift operation. In such a case, it is necessary to switch from the shift lever to another operation tool, which is troublesome. In particular, many operations are often performed in a short time when changing the direction of the aircraft at the shore, which makes the operation more troublesome.

  The present invention has been made paying attention to such points, and by giving many functions to the speed change lever, other operations related to the travel speed change operation can be performed lightly and quickly without changing the lever. Thus, the main purpose is to improve the operability of the paddy field machine.

The first feature of the present invention resides in the following configuration in a paddy field work machine.
The paddy field work device is connected to the traveling machine body so that it can be driven up and down freely.
A speed change lever that continuously changes the traveling speed is configured to be movable in a series of positions through a neutral position from the forward speed change operation path to the reverse speed change operation path.
Auto-up control means for automatically raising the paddy field work device in conjunction with the steering operation of the traveling machine;
And a backup control means for automatically increasing the paddy working device in conjunction with said shift lever is operated to the reverse shift operation path,
In conjunction with speed control mechanism of the shift lever and the engine, linearly actuated in the high speed side of the speed control mechanism As the operated from the neutral position to the high speed position side said shift lever in the forward shift operation path , Setting the speed control mechanism linearly to the low rotation side as the shift lever is operated to the neutral position side,
A plurality of forward shift positions are set in the forward shift operation path, and a plurality of reverse shift positions are set in the reverse shift operation path;
The rotational speed of the engine corresponding to the first reverse speed is set to be larger than the rotational speed of the engine corresponding to the first forward speed, and the rotational speed of the engine corresponding to the highest speed position of the shift lever in the reverse speed change operation path is set. Set smaller than the rotational speed of the engine corresponding to the highest speed position of the shift lever in the forward shift operation path;
It is configured to be executed in priority to the backup control unit the auto-up control means.

The second feature of the present invention is that the paddy field machine is configured as follows.
The paddy field work device is connected to the traveling machine body so that it can be driven up and down
A speed change lever that continuously changes the traveling speed is configured to be movable in a series of positions through a neutral position from the forward speed change operation path to the reverse speed change operation path.
Auto-up control means for automatically raising the paddy field work device in conjunction with the steering operation of the traveling machine;
Backup control means for automatically raising the paddy field work device in conjunction with the shift lever being operated on the reverse shift operation path;
The speed change lever and the engine speed control mechanism are linked so that the speed control mechanism is linearly operated to the high speed side as the speed change lever is operated from the neutral position to the high speed position side in the forward speed change operation path. , Setting the speed control mechanism linearly to the low rotation side as the shift lever is operated to the neutral position side,
A plurality of forward shift positions are set in the forward shift operation path, and a plurality of reverse shift positions are set in the reverse shift operation path;
The engine speed corresponding to the first reverse speed and the engine speed corresponding to the first forward speed and the second forward speed are set to be the same, and the maximum speed position of the speed change lever in the reverse speed change operation path is set. The engine rotational speed is set smaller than the engine rotational speed corresponding to the highest speed position of the shift lever in the forward shift operation path,
The backup control means is configured to be executed with priority over the auto up control means.

Whole side view of rice transplanter Overall plan view of rice transplanter Side view of speed change operation structure Control block diagram The top view which shows the lever guide part of the 1st example A diagram showing the relationship between the shift lever position and the engine speed Plan view showing the lever guide of the third example The top view which shows the lever guide part of the 4th example The top view which shows the lever guide part of the 5th example The top view which shows the lever guide part of the 6th example The top view which shows the lever guide part of the 7th example The top view which shows the lever guide part of the 8th example

  FIG. 1 shows an entire side surface of a riding type rice transplanter, which is an example of a paddy field working machine according to the present invention, and FIG. In this rice transplanter, a 6-row planting seedling planting device 4 is driven by a hydraulic cylinder 5 at a rear portion of a four-wheel drive type riding traveling body 3 having a front wheel 1 and a rear wheel 2. It has a basic structure in which it is connected so as to be able to be lifted and lowered via a lifting link mechanism 6 having a quadruple link structure, and a fertilizing device 7 is provided at the rear of the machine body.

  A gasoline engine 8 is mounted on the front of the traveling body 3 and the output thereof is belt-transmitted to a hydrostatic continuously variable transmission (HST) 9 which is a main transmission capable of switching between forward and backward travel. The shift output is input to the transmission case 10 and further gear-shifted into two steps of high and low by an auxiliary transmission (not shown), and then transmitted to the front wheels 1 and the rear wheels 2. Further, the working power branched from the traveling system in the mission case 10 is transmitted to the seedling planting device 4. A speed change lever 11 for operating the continuously variable transmission 9 is provided on the left side of the steering handle 12 of the boarding operation portion so as to be able to swing back and forth, and a sub speed change for operating the sub transmission in the transmission case 10. The lever 13 is provided on the left side of the driver's seat 14 of the boarding driving part, and further, the main clutch in the mission case 10 is disengaged by depressing the right front foot of the boarding driving part and the brake provided for the traveling system is braked. A pedal 15 for stopping the machine body is provided.

  The seedling planting device 4 has a seedling placing table 16 on which seedlings are placed and reciprocally moved laterally at a fixed stroke, and six sets of rotary types that cut out and plant seedlings one by one from the lower end of the seedling placing table 16. Planting mechanism 17 and three leveling floats 18 for leveling the planned planting location of the field, etc., are installed on the left and right sides of the rear portion of the three planting cases 19 supported in parallel in a rearward cantilevered manner. Two sets of 17 are mounted. In addition, the seedling planting device 4 has a pair of left and right drawing markers 20 for scratching and forming a running reference line in the next stroke after the U-turn on the non-planting side surface during planting traveling in one stroke in the reciprocating planting form, It is provided so as to be able to switch between a working posture projecting laterally and a stowed stowing posture, and the drawing marker 20 is stowed and locked in conjunction with the raising of the seedling planting device 4. Only the released drawing marker 20 is configured to be oscillated and oscillated to the action posture when the seedling planting device 4 is lowered.

  The three leveling floats 18 are each supported so as to be able to swing up and down around the rear fulcrum, and the center leveling float 18 is a sensor float SF for controlling the raising and lowering of the seedling planting device 4 with respect to the rice field. It is used as. That is, the vertical position of the sensor float SF is detected by the sensor 21 composed of a potentiometer, the detected value is compared with a preset reference value by the control device 22, and the detected value from the sensor 21 is held at the reference value. In this way, an automatic elevating control device is configured to control the electromagnetic control valve 23 of the hydraulic cylinder 5 to raise and lower the seedling planting device 4 so that the seedling planting device 4 follows the rice field.

  The shift lever 11 serves not only to change the traveling speed but also to function as a composite operation lever that activates other mechanism parts, some examples of which will be described below.

  [First example]

  3 to 5 show a first example of a speed change operation structure. In this example, the speed change lever 11 also has a function as an accelerator adjusting lever of the engine 8 and a lever for raising the seedling planting device. In other words, the speed adjusting mechanism 25 provided in the engine 8 has a throttle opening degree based on fluctuations in the engine speed so that the engine speed is stably maintained within the set range corresponding to the operation position of the speed adjusting lever 26. Is automatically adjusted, and a well-known mechanical governor is used. An operation lever 28 driven by an electric motor 27 with a speed reducer and the speed control lever 26 are linked by an operation wire 29, and an accelerator set operation of the speed control mechanism 25 is electrically executed via the electric motor 27. It has come to be. The operation of the electric motor 27 is controlled by the control device 22. The control device 22 detects the operation position of the potentiometer 30 for detecting the operation position of the speed change lever 11 and the operation lever 28. A feedback potentiometer 31 is connected, the operation of the electric motor 27 is controlled based on the detected information, and the accelerator setting operation of the speed adjusting mechanism 25 is performed as follows.

  Here, as shown in FIG. 3, the speed change lever 11 is supported by a support plate 42 that is supported by a fixed frame 41 so as to be rotatable around a horizontal horizontal fulcrum a so as to be able to swing laterally around a fulcrum b. An operation rod 44 extending upward from the fixed lever guide 43 and extending downward from the support plate 42 that rotates integrally with the speed change lever 11 is rotatable about a fulcrum c. A bell crank 45 and a rod 46 are mechanically linked to an operation arm 48 provided on a speed change operation shaft 47 of the continuously variable transmission 9. Further, the guide rod portion 11 a bent and extended downward from the fulcrum portion of the transmission lever 11 is inserted and guided in the guide groove 50 of the guide plate 49 attached to the fixed frame 41, thereby restricting the lever moving path. The guide groove 50 is formed in a stepped shape in the front-rear direction. As shown in FIG. 5, the forward transmission operation path F and the reverse transmission operation path R are parallel to each other as viewed from above the lever guide. In addition, it is displaced in a stepwise manner and is in a state of being connected in communication at the neutral position N.

  A large number (9 in this example) of positioning recesses 51 are formed on the outer periphery of the support plate 42, and the tip roller 53 of a leaf spring detent lever 52 is formed in any one of the recesses 49. Is configured to be elastically engaged to hold the transmission lever 11 at a plurality of operation positions. Specifically, in the forward shift operation path F, in addition to the neutral position N, five forward shift positions f1 to f5 are set, and in the reverse shift operation path R, in addition to the neutral position N, the third reverse shift position is set. Shift positions r1 to r3 are set.

  Although the detailed structure is omitted, the bell crank 45 and the airframe stopping pedal 15 are mechanically linked to each other, and the pedal 15 is depressed during forward or reverse to disengage the main clutch. When the vehicle is stopped by braking the brake, the bell crank 45 is forcibly rotated to a neutral position by a part of the pedaling force, and the shift lever 11 is forcibly returned to the neutral position N. .

  FIG. 6 shows the relationship between the speed change position of the speed change lever 11 and the target rotational speed (accelerator set speed) of the engine 8. That is, when the shift lever 11 is in the neutral position N, the target rotational speed is set to the idling rotational speed n0 (for example, 1700 rpm), and the speed is linearly increased from the neutral position N to the third forward speed [f3]. From the third forward speed [f3] to the fifth forward speed [f5], the maximum rotational speed n4 (for example, 3600 rpm) is set, and for the first forward speed [f1], the first set rotational speed n1 (for example, 2500 rpm) and the second forward speed [f2]. ], The second set rotational speed n2 (for example, 3000 rpm) appears. In the reverse shift operation path R, the target rotational speed is set to a third set rotational speed n3 (for example, 3200 rpm) that is slightly lower than the maximum rotational speed.

  In this case, the relationship between the speed change set by the speed change lever 11 and the accelerator set is stored in advance, and the target rotational speed set position of the speed control lever 26 corresponding to the operation position of the speed change lever 11 is determined. The electric motor 27 is feedback-controlled so as to move the speed adjusting lever 26 toward the set target rotational speed set position, and the accelerator set corresponding to the operation position of the speed change lever 11 is automatically performed.

  Further, the sub-forward shift operation path F ′ that can be shifted by the linear movement operation in the forward direction from the neutral position N (r) of the reverse shift operation path R is a low-speed side portion (first speed) in the regular forward shift operation path F. [F1] to the second speed [f2]) are provided continuously. Therefore, the shift lever 11 can be operated linearly over the sub-forward shift operation path F 'and the reverse shift operation path R to perform a quick forward / reverse switching shift (shuttle shift). Since the maximum forward speed by the shuttle shift is limited to the second speed [f2] by the front end of the sub-forward speed change operation path F ', there is no possibility that the reverse speed is inadvertently switched to the forward speed.

  A means for detecting that the speed change lever 11 is in the reverse speed change operation path R or the sub-forward speed change operation path F 'is provided beside the lever operation path. This lever position detecting means is composed of a sensing lever 56 which is operated to swing by contact with the shift lever 11 in the reverse shift operation path R or the sub-forward shift operation path F ′, and a switch 57 which detects the swing. From the detection information of the switch 57 and the potentiometer 30, it is determined whether the shift lever 11 is in the reverse shift operation path R or the sub-forward shift operation path F ′. When it is determined that the vehicle is in R, the accelerator is set to the third set rotational speed n3 lower than the maximum speed as described above, and it is also determined that the vehicle is in the auxiliary forward speed change operation path F ′. Then, the accelerator is set to the same third setting rotational speed n3 as that of the reverse speed change operation path R.

  When it is determined that the shift lever 11 has been operated from the normal forward shift operation path F to the sub-forward shift operation path F ′, the forced raising control of the seedling planting device 4 is executed, and the shift lever 11 is The forced raising control of the seedling planting device 4 is also executed by determining that the reverse side neutral position N (r) and the reverse shift operation path R are operated. That is, the automatic ascent control (low speed up control) at low speed forward when the speed change lever 11 is operated in the sub-forward speed change operation path F ′ and the automatic ascent control (backup control) when reverse is executed are executed. The planting device 4 is preferentially driven up to the upper limit.

  Here, when the forward speed (f1 ′ to f2 ′) is selected in the auxiliary forward speed change operation path F ′ in which the low speed up control is performed, the same forward speed (f1 to f2) is selected in the forward speed change operation path F. Since the engine speed is higher than the case (same as the engine speed during reverse travel) and the accelerator is set, a sufficient discharge amount from the hydraulic pump directly connected to the engine 8 is secured, and the operating speed of the hydraulic cylinder 5 is high. As a result, the seedling planting device 4 is quickly raised.

  Further, the control device 22 is connected with a steering angle sensor 58 for detecting a turning angle from the neutral position of the front wheel 1, and the front wheel 1 is steered to a larger angle than a set angle (for example, 30 degrees). When detected, control (auto-up control) for automatically raising the seedling planting device 4 is executed. This auto-up control can be turned on / off by the changeover switch 59. In the modified field, the switch 59 is switched to the off position to stop the auto-up control. It is possible to avoid the seedling planting device 4 from being lifted carelessly by the auto-up control during curve planting with a large amount. Even when the auto up control is stopped by the changeover switch 59, the low speed up control and the backup control based on the determination of the operation position of the speed change lever 11 are always executed with priority.

  In addition, when the above-described low-speed up control, backup control, and auto-up control are activated and the seedling planting device 4 is driven up, a planting clutch 60 (mission mission) that interrupts power transmission to the seedling planting device 4 The interior of the case 10 is cut and operated by the electric motor 61.

  A cross swing type operation lever 62 biased to return to neutral is provided on the right side of the steering handle 12, and the up / down operation of the operation lever 62 is detected by a switch (not shown). ing. Then, by operating the operation lever 62 once upward from the neutral position, the seedling planting device 4 is preferentially driven up to the upper limit, and the planting clutch 60 is turned off by the electric motor 61. Further, when the operation lever 62 is operated once from the neutral position while the seedling planting device 4 is raised, the seedling planting device 4 is lowered with priority. Further, after the lowering operation, the operation lever 62 is lowered again for the second time from the neutral position so that the planting clutch 60 is operated by the electric motor 61 and the driving of the seedling planting device 4 is started. .

  Further, when the operation lever 62 is swung forward, the storage lock of the left drawing marker 20 is released, and when the operation lever 62 is swung back, the storage lock of the right drawing marker 20 is released. As described above, the operation lever 62 and a marker storage lock mechanism (not shown) are mechanically linked by wire.

  [Second example]

  In the same structure as the first example, when it is determined that the shift lever 11 is operated from the forward shift operation path F to the sub-forward shift operation path F ′, the forced raising control of the seedling planting device 4 is executed. When it is determined that the planting clutch 60 is disengaged and the shift lever 11 is again operated from the forward shift operation path F to the sub-forward shift operation path F ′, the forced lowering control of the seedling planting device 4 is executed. That is, the raising control and the lowering control of the seedling planting device 4 can be alternately performed every time the shift lever 11 is operated in the sub-forward shift operation path F ′.

[Third example]

FIG. 7 shows the speed change operation path in the third example. In this example, the auxiliary forward speed change operation path F ′ in the first example is formed on the lateral side of the entire area of the forward speed change operation path F, and the forward / reverse switching can be quickly performed by a linear operation. The lever 11 can be moved from an arbitrary shift position of the forward shift operation path F to the sub-forward shift operation path F ′ to raise the seedling planting device 4.
In addition, the technique of the second example is introduced into the third example so that the raising control and the lowering control of the seedling planting device 4 are alternately performed every time the shift lever 11 is operated to the sub-forward shift operation path F ′. It can also be configured.

  [Fourth example]

FIG. 8 shows the speed change operation path in the fourth example. In this example, in the structure of the first example, a partition wall 65 is formed between the reverse shift operation path R and the sub-forward shift operation path F ′, and forward / reverse switching (shuttle shift) by linear operation is not possible. However, low speed up control and backup control by the shift lever 11 can be performed.
Also in this case, as in the second example, the raising control and the lowering control of the seedling planting device 4 can be alternately performed every time the speed change lever 11 is operated to the sub-forward speed change operation path F ′.

  [Fifth example]

  FIG. 9 shows a speed change operation path in the fifth example. In this example, based on the first example, the basic structure is the left and right from the forward speed change operation path F at the middle speed position [f4], which is faster than the auxiliary forward speed change operation path F ′ and lower than the maximum speed [f5]. Marker selection operation paths ML and MR are extended. Further, in this example, the support plate 42 does not have the positioning notch 51 in the entire range of the sub-forward shift operation path F ′ and in the low speed range from the neutral position N (r) to the reverse second speed in the reverse shift operation path R. The shift can be maintained continuously. Further, the raising control and the lowering control of the seedling planting device 4 are alternately performed every time the shift lever 11 is operated in the sub-forward shift operation path F ′. Furthermore, the planting clutch 60 can be engaged by the electric motor 61 by operating one of the marker selection operation paths ML and MR. In this example, the shift lever 11 can be used to move the seedling planting device 4 up and down, the planting clutch 60 on and off, and the selection of the drawing marker 20, so that the operation lever 62 in the first example is not necessary.

  According to this configuration, when the planting traveling of one stroke is finished, the shifting lever 11 is operated to the auxiliary forward shifting operation path F ′ to reduce the traveling speed, and the seedling planting device 4 can be controlled by the low speed up control. The planting clutch 60 can be disengaged and the aircraft is turned in this state. Then, when the direction change is about to end, the shifter 11 is operated again from the forward shift operation path F to the sub-forward shift operation path F ′ so that the seedling planting device 4 remains in the state where the planting clutch 60 remains disconnected. Lower to the surface. After the alignment, the speed change lever 11 is speeded up to the middle speed position [f4] of the forward speed change operation path F and operated to one of the left and right marker selection operation paths ML and MR, so The drawing marker 20 can be protruded to the action posture. In this example, by operating the speed change lever 11 to one of the marker selection operation paths ML and MR, the planting clutch 60 is engaged by the electric motor 61, and planting traveling at a medium speed is started. Become. Thereafter, if necessary, the maximum speed [f5] is selected for the speed change lever 11, and efficient planting traveling can be performed.

  [Sixth example]

  FIG. 10 shows the speed change operation path in the sixth example. This example is a modification of the fifth example described above, and the marker selection operation paths ML and MR extend from the maximum speed position of the forward shift operation path F to the left and right, and although not shown, A switch for turning on and off the planting clutch is provided on the grip so that the finger can be operated.

  According to this configuration, when the planting traveling of one stroke is finished, the shifting lever 11 is operated to the auxiliary forward shifting operation path F ′ to reduce the traveling speed, and the seedling planting device 4 can be controlled by the low speed up control. The planting clutch 60 can be disengaged and the aircraft is turned in this state. Then, when the direction change is about to end, the shifter 11 is operated again from the forward shift operation path F to the sub-forward shift operation path F ′ so that the seedling planting device 4 remains in the state where the planting clutch 60 remains disconnected. Lower to the surface. After the alignment, the speed change lever 11 is speeded up to the maximum speed position [f5] of the forward speed change operation path F and operated to one of the left and right marker selection operation paths ML, MR, so The drawing marker 20 can be protruded to the action posture. In this example, by operating the speed change lever 11 to one of the marker selection operation paths ML and MR, the planting clutch 60 is engaged by the electric motor 61, and planting traveling at high speed is started. .

  Here, since the planting clutch 60 can also be turned on by a switch provided on the grip portion of the transmission lever 11, after the alignment, the transmission lever 11 is operated to an arbitrary position on the forward transmission operation path F, and It is also possible to operate the switch to insert the planting clutch 60 and start planting travel, and then operate to one of the left and right marker selection operation paths ML and MR to switch the required drawing marker 20 to the working posture.

  In addition, as a form of rice planting work, there is a form in which a space for one stroke is made at the heel and the round trip planting is started, and after the round trip planting is completed, the surrounding planting is carried out along the heel. Before starting, when one of the drawing markers 20 is switched to the action posture and only drawing is performed without planting, the marker selection operation path ML, MR is operated to switch the drawing marker 20 to the action posture. Later, the planting clutch 60 can be disconnected by operating the switch of the transmission lever 11 with a finger.

  [Seventh example]

  FIG. 11 shows the speed change operation path in the seventh example. In this example, the shift lever 11 can be operated to the left and right in the forward shift operation path F and is urged to return to neutral in the lateral direction, and the shift lever 11 is laterally operated to the left in the low speed range. The seedling planting device 4 is raised, the planting clutch 60 is turned off, the shift lever 11 is operated laterally to the right, the seedling planting device 4 is lowered, and the seedling planting device 4 is further lowered. The planting clutch 60 is engaged and operated by the second lateral operation to the right.

  Further, marker selection operation paths ML and MR are extended from the middle speed position of the forward speed change operation path F to the left and right, and the drawing marker 20 on the side operated by the selection operation to the marker selection operation paths ML and MR is extended. The storage lock is released, and the planting clutch 60 is engaged and operated.

  [Eighth example]

  FIG. 12 shows the speed change operation path in the eighth example. This example is a modification of the seventh example, and the marker selection operation paths ML and MR are extended from the maximum speed position of the forward shift operation path F, and to the left in the entire area of the forward shift operation path F. When the seedling planting device 4 is raised, the planting clutch 60 is disengaged, the shift lever 11 is laterally operated to the right, the seedling planting device 4 is lowered, and the seedling planting device 4 is further lowered. The planting clutch 60 is engaged and operated by a second lateral operation to the right after the operation.

3 traveling machine body 4 paddy field working device 8 engine 11 speed change lever 25 speed control mechanism F forward speed change operation path R reverse speed change operation path N neutral position

Claims (2)

The paddy field work device is connected to the traveling machine body so that it can be driven up and down freely.
A speed change lever that continuously changes the traveling speed is configured to be movable in a series of positions through a neutral position from the forward speed change operation path to the reverse speed change operation path.
Auto-up control means for automatically raising the paddy field work device in conjunction with the steering operation of the traveling machine;
And a backup control means for automatically increasing the paddy working device in conjunction with said shift lever is operated to the reverse shift operation path,
In conjunction with speed control mechanism of the shift lever and the engine, linearly actuated in the high speed side of the speed control mechanism As the operated from the neutral position to the high speed position side said shift lever in the forward shift operation path , Setting the speed control mechanism linearly to the low rotation side as the shift lever is operated to the neutral position side,
A plurality of forward shift positions are set in the forward shift operation path, and a plurality of reverse shift positions are set in the reverse shift operation path;
The rotational speed of the engine corresponding to the first reverse speed is set to be larger than the rotational speed of the engine corresponding to the first forward speed, and the rotational speed of the engine corresponding to the highest speed position of the shift lever in the reverse speed change operation path is set. Set smaller than the rotational speed of the engine corresponding to the highest speed position of the shift lever in the forward shift operation path;
Paddy working machine that is configured to be executed in priority to the backup control unit the auto-up control means. The paddy field work device is connected to the traveling machine body so that it can be driven up and down freely.
A speed change lever that continuously changes the traveling speed is configured to be movable in a series of positions through a neutral position from the forward speed change operation path to the reverse speed change operation path.
Auto-up control means for automatically raising the paddy field work device in conjunction with the steering operation of the traveling machine;
Backup control means for automatically raising the paddy field work device in conjunction with the shift lever being operated on the reverse shift operation path;
The speed change lever and the engine speed control mechanism are linked so that the speed control mechanism is linearly operated to the high speed side as the speed change lever is operated from the neutral position to the high speed position side in the forward speed change operation path. , Setting the speed control mechanism linearly to the low rotation side as the shift lever is operated to the neutral position side,
A plurality of forward shift positions are set in the forward shift operation path, and a plurality of reverse shift positions are set in the reverse shift operation path;
The engine speed corresponding to the first reverse speed and the engine speed corresponding to the first forward speed and the second forward speed are set to be the same, and the maximum speed position of the speed change lever in the reverse speed change operation path is set. The engine rotational speed is set smaller than the engine rotational speed corresponding to the highest speed position of the shift lever in the forward shift operation path,
A paddy field machine configured such that the backup control means is executed in preference to the auto-up control means .

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