JP2009207437A - Riding type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously attain prevention of deep planting in rice planting operation at low-speed traveling and prevention of seedling floating in rice transplanting operation at high-speed traveling, in a riding type rice transplanter equipped with a hydraulic cylinder 43 for lifting and lowering a seedling-planting apparatus 3 attached to a traveling machine body which loads an engine 7 and a traveling speed change transmission 8 and its hydraulic changeover valve 49 and making a changeover operation member 52 of the hydraulic changeover valve cooperate with a float 47b of the seedling planting apparatus so as to changeover the hydraulic changeover valve to a rise of the seedling planting apparatus by at least rise movement of the float. <P>SOLUTION: When speed change operation of a traveling speed change operation means 12 of a traveling speed change transmission is carried out so as to increase traveling speed, the traveling speed change operation means is made to cooperate with a changeover operation member 52 so as to prevent changeover operation from rising of a seedling transplantation apparatus accompanied by raising movement of a float in the changeover operation member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a riding type rice transplanter having a configuration in which a seedling planting device is mounted on a traveling machine body so as to be movable up and down.

  Conventionally, in this type of riding type rice transplanter, the seedling planting device is configured to move up and down by a hydraulic cylinder with respect to the traveling machine body, and the seedling planting device is provided with a hydraulic switching valve for the lifting hydraulic cylinder. By inputting the vertical movement of the float installed in the field of the planting device, the seedling planting device is moved up and down according to the vertical movement of the float, thereby controlling the planting depth of the seedling in the field. I am doing so.

In this planting depth control, Patent Documents 1 and 2 as prior arts indicate that the switching sensitivity of the elevating hydraulic switching valve with respect to the vertical movement of the float is increased according to the engine speed. By lowering the engine speed and increasing the engine speed, the float floating phenomenon during the rice planting operation at high speeds can be suppressed, and the shallow planting caused by the float floating can be prevented. It is proposed to suppress the generation of seedlings.
JP 60-137203 A Japanese Patent Laid-Open No. 11-113332

  However, in rice planting work, for example, seedlings may be planted at low speeds under a high engine speed, such as rice planting work in a field where the mud layer is deep and the driving load is high. is there.

  On the other hand, according to the prior art, the switching sensitivity of the lifting / lowering hydraulic switching valve with respect to the vertical movement of the float is decreased when the engine speed is increased and increased when the engine speed is decreased, according to the engine speed. Due to this configuration, as described above, when rice planting is performed at a low speed while the engine speed is increased, the switching sensitivity of the lifting hydraulic switching valve is lowered at high engine speed. As a result, there was a problem that the raising of the seedling planting device accompanying the rise of the float was delayed, and the seedling planting on the field scene was deeply planted or the subduction of the float occurred.

  The present invention has a technical problem to solve this problem.

In order to achieve this technical problem, claim 1
"A seedling planting device is mounted on a traveling machine equipped with a traveling speed change mission with engine output as input, and a hydraulic cylinder that moves the seedling planting device up and down, and this hydraulic cylinder is moved up the seedling planting device. Or a hydraulic switching valve that controls the lowering, and further, the switching operation member of the hydraulic switching valve is provided with a float in the seedling planting device, and at least the hydraulic switching valve is provided with the upward movement of the float. In the riding type rice transplanter that is linked to operate ascending,
The switching operation member of the hydraulic switching valve includes an upward movement of the float in the switching operation member when the traveling transmission operation means of the traveling transmission mission at least operates the traveling transmission operation means to increase the traveling speed. It cooperates so that the switching operation | movement to the raise of the said seedling planting apparatus accompanying the may be prevented. "
It is characterized by that.

Claim 2
“In the first aspect of the present invention, a spring means is provided in the linkage means from the traveling speed change operating means to the switching operation member.”
It is characterized by that.

Claim 3
“In the description of claim 1 or 2, the switching actuating member has a structure of a balance body having a center of rotation at a portion between both ends, the float at one end of the both ends of the balance rod, and the float at the other end. The traveling speed change operation means are connected to each other. "
It is characterized by that.

Claim 4
“In the first or second aspect, the switching operation member has a lever body having a rotation center at one end, and the float and the traveling speed change operation means are connected to the lever body in opposite directions. ing."
It is characterized by that.

  According to the first aspect of the present invention, when the rice planting operation is performed at a high speed, an increase in the seedling planting device in the hydraulic switching valve is caused by an obstacle in cooperation with the shifting operation to increase the traveling speed in the traveling speed change operation means. The switching operation is delayed, in other words, the switching operation of the hydraulic switching valve to the raising of the seedling planting device based on the upward movement of the float is insensitive to the hindrance when performing high-speed traveling in rice planting work. Thus, since the floating of the float can be suppressed, the occurrence of shallow planting due to the floating of the float, and hence the generation of floating seedlings can be suppressed.

  On the other hand, when the rice planting operation is performed at low speed, there is no hindrance in cooperation with the shift operation to increase the travel speed in the travel shift operation means, or the hydraulic switching is based on the upward movement of the float. The switching operation of the valve to raise the seedling planting device becomes sensitive when the rice planting operation is performed at a low speed, so that deep planting and subsidence of float can be reliably reduced.

  That is, according to the present invention, the occurrence of shallow planting during the rice planting operation at high speed traveling, and thus the suppression of floating seedling generation, the prevention of deep planting and the prevention of float float sinking during the rice planting operation at low speed traveling. Both can be achieved simultaneously.

  In addition, according to the third and fourth aspects, the above-described effect can be achieved by a very simple configuration of a balance body or a lever body.

  Furthermore, according to the third aspect of the present invention, the control characteristic in cooperation with the speed change operation to increase the travel speed in the travel speed change operation means can be changed extremely easily and easily by appropriately changing the spring constant in the spring means. It can be set arbitrarily.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 and 2, reference numeral 1 denotes a riding type rice transplanter. The riding type rice transplanter 1 includes a traveling machine body 2 and a parallel link mechanism 42 including a top link 40 and a lower link 41 at a rear portion thereof. The vehicle body 2 supports the vehicle body frame 4 with a pair of left and right rear wheels 6 as well as a pair of left and right front wheels 5. This is the configuration.

  An engine 7 is mounted on the vehicle body frame 4 of the traveling machine body 2, and a traveling transmission mission 8 is configured to transmit power to the wheels 5 and 6 by appropriately shifting power from the engine 7. Thus, the traveling machine body 2 travels forward in the direction of arrow A by four-wheel drive.

  Furthermore, a driving operation unit 9 including a steering handle 10 and a seat 11 is provided on the upper surface of the vehicle body frame 4 in the traveling machine body 2, and the right side of the steering handle 10 is on the floor surface of the driving operation unit 9. The part is provided with a forward stepping-type shift pedal 12 that is a traveling speed change operation means and a forward stepping-type brake pedal 13 that are also arranged side by side. The vehicle body frame 4 is pivotally attached.

  As shown in FIG. 3, the traveling speed change mission 8 includes a variable hydraulic pump 15 that receives power from the engine 7 and a hydraulic motor 16 driven by the hydraulic pressure from the hydraulic pump 15. The continuously variable transmission mechanism 14 includes an HST type continuously variable transmission mechanism 14, which changes the inclination angle of the swash plate 15 a in the hydraulic pump 15 with the transmission lever 17, thereby increasing the traveling speed of the traveling machine body 2. Although not shown, the speed change lever 17 is provided with spring means for urging the speed change lever 17 in the deceleration direction.

  Further, as shown in FIG. 3, the traveling speed change mission 8 is provided with a clutch mechanism 18 for turning on / off (interrupting) power transmission to the wheels 5, 6. , 6 is provided with a brake mechanism 19.

  Further, the traveling transmission mission 8 is provided with a rotary operation shaft 20 for the brake mechanism 19, and the clutch mechanism 18 is connected to one operating member 21 fixed to the operation shaft 20 via a wire or the like. By connecting, when the one actuating member 21 is in the position indicated by the solid line in FIGS. 4 and 7, the brake mechanism 19 is on and the clutch mechanism 18 is off. The brake mechanism 19 is turned off and the clutch mechanism 18 is turned on when the vehicle is rotated backward in the direction indicated by arrow C in FIG. Each of the operating members 21 or the operation shaft 20 is provided with spring means (not shown) that urges the operating members 21 to rotate in the direction of the arrow B.

  On the other hand, the seedling planting device 3 is moved up and down by a hydraulic cylinder 43 provided in the traveling machine body 2. A transmission case 44 having a plurality of planting mechanisms 45 at the rear and an upper surface of the transmission case 44. And a plurality of floats 47a and 47b disposed on the lower surface of the transmission case 44. An arbitrary one of the floats 47a and 47b, for example, As shown in FIG. 8, the center float 47b located in the center is connected to the transmission case 44 via a link mechanism 48 so that the front part thereof can freely move up and down.

  Although not shown in the figure, the center float 47b is urged so as to be grounded with respect to a farm scene by a spring means provided between the transmission case 44 and the lift hydraulic pressure. The cylinder 43 is configured to be operated by a hydraulic pump 48 driven by the engine 7.

  As shown in FIG. 4, a shift operation shaft 22 extending in the lateral direction is rotatably supported by a bearing 23 at the front portion of the vehicle body frame 4, and at the right end of the shift operation shaft 22. Is provided with a detecting means 24 for detecting a depression operation and a depression release operation (details will be described later) of the speed change pedal 12, while a sector gear 25 is fixed to the left end of the speed change operation shaft 22. ing.

  An arm 26 is fixed to the speed change operation shaft 22, and a front end of a speed change rod rod 27 extending rearward is pivotally attached to the tip of the arm 26, and an appropriate length provided at the rear end of the speed change rod rod 27. A pin 17a provided at the tip of the speed change lever 17 in the continuously variable transmission mechanism 14 of the traveling speed change transmission 8 is slidably fitted into and engaged with the long groove hole 27a of the traveling speed change transmission 8. The speed change mechanism 14 is in a state in which almost no power is transmitted when the speed change operation shaft 22 does not rotate and, as a result, the speed change rod rod 27 does not move rearward. The movement of the speed change rod rod 27 in the counterclockwise direction indicated by the arrow C in proportion to the rearward movement of the speed change rod rod 27 from the time when the length L of the long groove hole 27a is exceeded. And While the running speed is increased continuously, the speed change rod shaft 27 travels in proportion to the forward movement of the speed change rod rod 27 accompanying the clockwise rotation indicated by the arrow D in FIGS. The speed is continuously reduced.

  A pinion 29 that is rotationally driven by an electric actuator 28 is engaged with the sector gear 25, and the speed change operation shaft 22 is connected to the arrow C by way of the sector gear 25. And a counterclockwise direction indicated by the arrow D and a clockwise direction indicated by the arrow D.

  A shift pedal shaft 30 parallel to the shift operation shaft 22 is rotatably supported on the right end portion of the shift operation shaft 22, and the shift pedal shaft 30 is linked to the shift pedal 12 via an interlock mechanism 31. Accordingly, the shift pedal 12 is rotated clockwise as indicated by an arrow E by a stepping operation of depressing the shift pedal 12 from a standing state against a spring means (not shown), and the shift pedal 12 is released. In the step release operation of returning to the original standing posture direction by the spring means from the stepped-on position, the rotation is made in the counterclockwise direction indicated by the arrow F.

  The detecting means 24 at the right end of the speed change operation shaft 22 includes a box 24a fixed to the speed change operation shaft 22, a rotor 24b rotatably provided on the box 24a, and a radially outward direction from the rotor 24b. The bifurcated arm 24c protrudes and a pair of switches 24d and 24e provided on both sides of the bifurcated arm 24c in the box 24a. The bifurcated arm 24c is connected to the shift pedal shaft 30. When the tip of the projecting arm 32 is engaged, the bifurcated arm 24c and the rotor 24b are rotated counterclockwise as indicated by an arrow E 'by the depressing operation of the speed change pedal 12. One switch 24d is switched from OFF to ON, and the shift pedal 12 is depressed from the depressed state. Rotates in a clockwise direction as indicated by an arrow F 'in releasing operation, the other switch 24e is configured to switch ON from OFF.

  The controller denoted by reference numeral 33 in FIG. 4 receives signals from both switches 24d and 24e of the detecting means 24 as input, changes the inputs as appropriate, and outputs them to the electric actuator 28. The switches 24d, When one switch 24d of 24e is turned from OFF to ON, the electric actuator 28 rotates the speed change operation shaft 22 in the direction of arrow C via the sector gear 25, so that the speed change rod rod 27 is 4, as shown by a solid arrow G in FIGS. 6 and 7, when the other switch 24e of both the switches 24d and 24e is turned from OFF to ON, the speed change rod rod 27 is moved to FIG. As shown by a dotted arrow H in FIGS. 6 and 7, it is configured to move forward.

  As shown in FIG. 7, one operating member 21 for both the clutch mechanism 18 and the brake mechanism 19 is integrally provided with a receiving piece 21a, on which the speed change rod rod 27 is slid. A stopper piece 27b that comes into contact with the receiving piece 21a is provided at the rear end of the speed change rod rod 27 so that the speed change operation shaft 22 does not rotate and the speed change rod rod 27 Is not moved backward, that is, when the shift pedal 12 is not depressed, the stopper piece 27b causes the one actuating member 21 to be turned on while the brake mechanism 19 is ON and the clutch mechanism 18 is OFF. The one actuating member 21 is shown by a two-dot chain line in FIG. 7 against its spring means by holding it in the stopped state and moving the shift rod rod 27 backward. Rotates behind the urchin arrow B, the brake mechanism 19 is configured such that the clutch mechanism 18 is OFF becomes a traveling state is ON.

  The brake pedal 13 arranged in parallel with the speed change pedal 12 is adapted to rotate the brake shaft 34 on the brake shaft 34 rotatably supported on the vehicle body frame 4 by depressing the brake pedal 13. A brake rod rod 36 extending rearward is coupled to the tip of an arm 35 fixed to the brake shaft 34, and the rear end portion of the brake rod rod 35 is connected to the one end as shown in FIG. In a state where the brake pedal 13 is not depressed, the stop state of the one actuating member 21 is achieved by slidably penetrating the locking piece 21b provided on one actuating member 21 and providing a stopper 36a at the rear end thereof. Free operation from the running state (the position indicated by the two-dot chain line in FIG. 7) from the position indicated by the solid line in FIG. 7 is permitted. When the moving member 21 is in the running state, the brake pedal 13 is depressed against its spring, so that the one actuating member 21 can be operated regardless of the speed change rod rod 27, in other words, the speed change gear 21 Prior to the operation of the pedal 12, the stop state can be forcibly set.

  On the other hand, the traveling machine body 2 is provided with a hydraulic switching valve 49 for the lifting hydraulic cylinder 43 of the seedling planting device 3 as shown in FIG.

  The hydraulic switching valve 49 stops the raising / lowering movement of the hydraulic cylinder 43 with the spool 49a, the raising position for raising the seedling planting device 3, the lowering position for lowering the seedling planting device 3, and between them. The spool 49a is urged so as to always maintain the lowered position by a compression spring 49a 'provided on the spool 49a. A lift lever 51 pivotally attached to the traveling machine body 2 by a pin 50 is brought into contact with the tip, and when the lift lever 51 is rotated in the direction of arrow N from a neutral position shown by a solid line in FIG. When the switching valve 49 reaches the lowered position of the seedling planting device 3 by the compression spring 49a ′ and rotates against the compression spring 49a ′ in the direction of arrow M, the hydraulic switching valve 49 is moved to the seedling. Planting device 3 It is configured to be in the raised position.

  In addition, the rice planting operation | work with respect to a farm field is performed in the state which the said seedling planting apparatus 3 moved down so that each float 47a, 47b may contact | abut to a farm scene.

  A balance body 52 as a switching operation member for the hydraulic switching valve 49 is rotatably supported on the pivot pin 50 of the elevating lever 51. The balance body 52 is supported on the one end 52a side from the center of rotation. In the portion, a contact piece 52b to the spool 49a in the hydraulic switching valve 49 is provided, and the one end 52a is slidably inserted into the seedling planting device 3 and the flexible cableway tube 53. The hydraulic switching valve 49 is connected to the seedling planting device 3 through the wire 54 so that the hydraulic switching valve 49 is switched according to the vertical movement of the center float 47b.

  That is, as shown in FIG. 8, one end of the wire 54 is engaged with one end 52a of the balance body 52, and one end of the cableway tube 53 is engaged with a sensitivity adjustment lever 55 provided in the traveling machine body 2. On the other hand, the other end of the wire 54 is engaged with a transmission case 44 in the seedling planting device 3 via a link 56, and the other end of the cableway tube 53 is connected to the center float 47 b in the seedling planting device 3. The bracket 54 is engaged with the upright bracket 54.

  With this configuration, the hydraulic switch valve 49 is moved to the lowered position by the operation of the lifting lever 51, so that the seedling planting device 3 is moved downward, and the floats 47a, 47b enter the field scene during the downward movement. When the ground float reaches a predetermined height with respect to the transmission case 44 with the center float 47a approaching a predetermined height, when the ground contact pressure reaches a predetermined value, the balance body is connected via the cableway pipe 53 and the wire 54. As indicated by an arrow P, the hydraulic switching valve 49 is switched from the lowered position to the neutral position against the compression spring 49a '. ， Execute rice planting work in this state.

  Further, during the rice planting operation, when the center float 47b moves upward so as to approach the transmission case 44 and the ground pressure becomes higher than a predetermined value, the balance body is connected via the cableway pipe 53 and the wire 54. 52, as indicated by an arrow P, the hydraulic switching valve 49 is switched from the neutral position to the raised position against the compression spring 49a ′ by rotating so that one end 52a thereof is lowered. When the seedling planting device 3 is raised and the center float 47b reaches a predetermined height with respect to the transmission case 44 and the ground pressure reaches a predetermined value, the hydraulic switching valve 49 is moved from the raised position. By returning to the neutral position, control is performed so that the planting depth of the seedling with respect to the field scene is substantially uniform.

  A rod rod 59 having a spring means 58 is engaged with the other end 52c of the balance body 52 as a switching operation member for the hydraulic switching valve 49. A long slot 59a at the lower end of the rod rod 59 is attached. Further, by engaging the tip of the arm 60 protruding from the speed change operation shaft 22, the balance body 52 is rotated by the rotation of the speed change operation shaft 22 in the direction of arrow C when the speed change pedal 12 is depressed. However, it is configured to rotate in the direction opposite to the arrow P so that the other end 52c is lowered, thereby preventing the rotation of the balance body 52 in the direction of the arrow P in conjunction with the upward movement of the center float 47b. ing.

  In this configuration, when the speed change pedal 12 is not depressed, the speed change operating shaft 22 does not rotate and the speed change rod rod 27 does not move rearward, so that the HST type continuously variable speed change mechanism 14 of the traveling speed change transmission 8 is provided. The shift lever 17 is not rotated.

  In addition, when the shift pedal 12 is not depressed, the one actuating member 21 is in a stopped state indicated by a solid line in each figure, and the power transmission is cut off when the brake mechanism 19 is ON and the clutch mechanism 18 is OFF. Therefore, the traveling machine body 2 does not travel.

  Next, when the shift pedal 12 is depressed, the shift pedal shaft 30 first rotates in the direction of arrow E, and based on this rotation, the bifurcated arm 24c and the rotor 24b in the detecting means 24 move in the direction of arrow E '. By rotating in the direction, one of the switches 24d and 24e in the detection means 24 is switched from OFF to ON, so that the electric actuator 28 is instructed by the controller 33, Since the speed change operation shaft 22 rotates in the direction of arrow C, the speed change rod rod 27 starts to move backward as indicated by a solid line arrow G.

  When the initial rearward movement of the speed change rod rod 27 reaches the length L of the long slot 27a at the rear end, the stopper 27b is moved rearward from the receiving piece 21a of the one actuating member 21, thereby Since one actuating member 21 rotates in a traveling state along a two-dot chain line, power transmission is performed when the brake mechanism 19 is OFF and the clutch mechanism 18 is ON.

  The rearward movement of the speed change rod rod 27 is continued by continuing the depressing operation of the speed change pedal 12, and when the rearward movement exceeds the length L of the long groove hole 27a, the speed change lever 17 is moved. Since the HST type continuously variable transmission mechanism 14 is actuated for power transmission, the traveling machine body 2 starts traveling.

  The travel speed during this travel is proportional to the further rearward movement of the speed change rod rod 27 and, consequently, the operation of depressing the speed change pedal 12.

  When the depressing operation of the speed change pedal 12 is stopped, the controller 33 continues the rotation of the speed change operation shaft 22 in the direction of the arrow C by the electric actuator 28, so that one switch 24d in the detecting means 24 is turned on. From the ON state to the OFF state, the instruction of the controller 33 stops the rotation of the speed change operation shaft 22 in the direction of the arrow C by the electric actuator 28. As a result, the shift rod rod 27 is moved rearward. Since the vehicle stops at the position, it is possible to maintain the traveling speed corresponding to the depressed position of the speed change pedal 12. In this traveling state, the seedling planting device 3 is moved downward to perform the predetermined rice planting operation. It can be carried out.

  In this rice planting operation, when the shift pedal 12 is depressed at a low speed, the rotation of the hydraulic switching valve 49 in the direction opposite to the arrow P in cooperation with the shift pedal 12 is depressed in the balance body 52. There is little or no movement.

  Therefore, during the rice planting operation at low speed, rotation of the balance body 52 in the direction of the arrow P in conjunction with the upward movement of the center float 47b is hindered by the stepping operation of the shift pedal 12. Therefore, the raising of the seedling planting device 3 following the ascending movement of the center float 47b is performed with high sensitivity with little delay.

  On the other hand, when the padding operation is performed at a high speed by further depressing the shift pedal 12, the balance body 52 of the hydraulic switching valve 49 cooperates with the further depressing operation of the shift pedal 12. Since the rotation in the direction opposite to the direction of the arrow P greatly hinders the rotation in the direction of the arrow P in conjunction with the upward movement of the center float 47b in the balance body 52, the upward movement of the center float 47b The raising of the seedling planting device 3 following the movement is performed with low sensitivity so that it can be delayed.

  When the shifter 12 is configured to prevent rotation in the direction of the arrow P in conjunction with the upward movement of the center float 47b in the balance body 52 by depressing operation of the shift pedal 12, The rod rod 59 that transmits the stepping operation for increasing the traveling speed to the other end portion 52c of the balance body 52 is provided with a spring means 58, and by changing the spring constant of the spring means 58 appropriately, the characteristics thereof are It can be set very simply and arbitrarily.

  In the above-described embodiment, the drive rotational speed of the engine 7 is automatically changed according to the shift operation in the traveling shift transmission 8.

  That is, as shown in FIG. 6, when the cam gear 37 is provided with a cam groove 37 extending in the circumferential direction, the cam gear 37 is provided with the speed change operation shaft 22 whose start end 37a is the center of the fan gear 25. The rotational direction of the sector gear 25 in the direction of the arrow C, that is, the traveling speed is increased so that the end 37b is located at a portion of a small radius R2 from the speed change operation shaft 22 while being located at a portion of a large radius R1. It is configured to incline so as to gradually approach the center of rotation as the rotational direction increases.

  The cam groove 37 is slidably engaged with a tip of a first arm 39 protruding from a horizontal shaft 38 rotatably supported on the vehicle body frame 4, and a second arm 40 fixed to the horizontal shaft 38. And the accelerator lever 7a in the engine 7 are connected by a wire 41 or the like.

  In this configuration, the accelerator lever 7a is opposed to its return spring means 7b in the cam groove 37 in accordance with the direction of rotation of the sector gear 25 in the direction of arrow C, that is, the increase in travel speed. Since the engine 7 rotates in the direction indicated by J, the rotational speed of the engine 7 is automatically increased in proportion to the increase in traveling speed from idle rotation.

  On the other hand, according to the rotation direction of the sector gear 25 in the direction of the arrow D, that is, in accordance with the reduction of the traveling speed, the accelerator lever 7a is returned by the return spring means 7b in the cam groove 37. Therefore, the rotational speed of the engine 7 is automatically decelerated in proportion to the reduction in travel speed, and becomes idle when travel stops.

  Of course, the rotational speed of the engine 7 can be arbitrarily changed by manually operating the accelerator lever 7a.

  Next, FIG. 9 shows another embodiment.

  In this other embodiment, the switching member for switching the hydraulic switching valve 49 between a neutral position and a rising position and a falling position sandwiching the hydraulic switching valve 49 is configured as a lever body 52 'that rotates about one end. In this case, a wire 54 from the center float 47b in the seedling planting device 3 and a rod rod 58 linked to the shift pedal 12 are connected to the tip of the lever body 52 'so as to extend in opposite directions. It is the structure of wearing.

  Even in this configuration, the lever body 52 ′ is prevented from rotating in the direction in which the seedling planting device 3 is lifted in association with the upward movement of the center float 47 b by the operation of the shift pedal 12 to step up to increase the traveling speed. Therefore, the same effect as described above can be obtained.

It is a side view of a riding type rice transplanter. It is a top view of FIG. It is the schematic which shows a traveling speed change mission. It is a top view which shows a traveling operation apparatus. FIG. 5 is an enlarged sectional view taken along line VV in FIG. 4. FIG. 7 is an enlarged sectional view taken along line VI-VII in FIG. 4. It is a principal part enlarged view of FIG. It is a figure which shows the relationship between the hydraulic switching valve with respect to a raising / lowering hydraulic cylinder, a float, and a speed change pedal. It is a figure which shows another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Riding type rice transplanter 2 Traveling machine body 3 Seedling planting device 47a, 47b Float 4 Body frame 5 Front wheel 6 Rear wheel 7 Engine 8 Traveling transmission mission 9 Driving operation part 12 Shifting pedal (traveling transmission operation means)
DESCRIPTION OF SYMBOLS 13 Brake pedal 14 HST type continuously variable transmission mechanism 17 Transmission lever 22 Transmission operation shaft 25 Transmission fan-shaped gear 27 Transmission rod rod 28 Actuator 43 Lifting hydraulic cylinder 49 Hydraulic switching valve 52 Balance body (switching operation member)
52 'Lever body (switching operation member)
54 Wire for Linking with Float 59 Rod Rod for Linking with Shift Pedal 58 Spring Means

Claims (4)

A seedling planting device is mounted on a traveling vehicle equipped with a traveling speed change mission with engine output as input, and the seedling planting device can be moved up and down. A hydraulic switching valve for controlling the lowering, and further, the switching operation member of the hydraulic switching valve is floated in the seedling planting device, and at least the hydraulic switching valve is lifted by raising the float. In the riding type rice transplanter that is linked to operate in
The switching operation member of the hydraulic switching valve includes an upward movement of the float in the switching operation member when the traveling transmission operation means of the traveling transmission mission at least operates the traveling transmission operation means to increase the traveling speed. A riding-type rice transplanter, which cooperates so as to prevent the switching operation of the seedling planting device to ascend with the above.   2. The riding type rice transplanter according to claim 1, wherein a spring means is provided in the linkage means from the travel shift operation means to the switching operation member.   3. The balance switch according to claim 1, wherein the switching operation member has a structure of a balance body having a center of rotation at a portion between both ends, the float at one end of the balance body, and the travel at the other end. A riding type rice transplanter characterized in that shift operation means are connected to each other. 3. The switching operation member according to claim 1 or 2, wherein the switching operation member is a lever body having a rotation center at one end, and the float and the traveling speed change operation means are coupled to the lever body in opposite directions. Riding type rice transplanter characterized by

Images