JPH052979Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of the operating device of a rice transplanter when starting seedling planting work.

[Problems that conventional technology and ideas try to solve]

In general, seedling planting work in the field using a rice transplanter is
The seedling planting device is lowered so that its float touches the field, and the seedling planting device is driven while moving forward at an appropriate speed. When you progress to
After temporarily interrupting seedling planting and making a direction turn by stopping the drive of the seedling planting device while the forward traveling speed is reduced, the forward traveling speed is then increased and the seedling planting device is driven. It is well known that the seedlings are then planted again.

However, in conventional rice transplanters, the two operations mentioned above, namely, the ON/OFF operation of the seedling transplanter drive and the operation of changing the running speed, are performed separately, making these operations extremely difficult. This was not only troublesome, but also prone to operational errors.

In addition, conventional rice transplanters are configured to start planting seedlings at a predetermined angle immediately after turning, so that when starting seedling planting work at a predetermined speed, the engine This places a large load on various power transmission mechanisms, which not only reduces durability, but also requires the seedlings to be planted at a predetermined speed, making it difficult to accurately align the rows with the already planted seedlings. There was also the problem of not being able to do so.

The object of the present invention is to provide a driving operation device that solves these problems.

[Means to solve the problem]

In order to achieve this objective, the present invention includes a planting clutch mechanism that intermittents the power to the seedling planting device, and also includes a power transmission section from the engine to the traveling wheels and the seedling planting device. In a rice transplanter equipped with a speed change mechanism, the planting clutch mechanism is attached to a rotationally operated operation lever provided on the rice transplanter, and when the operation lever is rotated by a certain angle, the planting clutch mechanism is activated. The transmission mechanism is connected to the control lever so that the clutch is engaged from the clutch disengagement position, and the control lever is connected to the transmission mechanism at a high reduction ratio when the control lever is in the range up to the planting clutch engagement position. The related structure is such that when the planting clutch is rotated further from the engaged position, the reduction ratio is switched to a low reduction ratio.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates a running vehicle body, and the running vehicle body 1 includes a vehicle body frame 2, two front wheels 3 attached to both left and right sides of the lower front surface thereof, and a rear lower surface of the vehicle body frame 2. The upper surface of the vehicle body frame 2 is provided with a seat 6 and a control handle 7, and the lower surface of the vehicle body frame 2 is provided with a seat 6 and a control handle 7. A transmission transmission mechanism 10 is provided for appropriately changing the speed of power from an engine 8 mounted on the front upper surface of the vehicle body frame 2 and transmitting the power to each wheel 3, 5 and a seedling planting device 9 to be described later.

As shown in FIG. 3, this transmission system 10 includes an input shaft 12, a transmission shaft 13, and an intermediate shaft 14, which are transmitted from the engine 8 through a belt 11. A low speed gear 16 that constantly meshes with a small gear 15 fixed on the shaft 12
and a large gear 1 fixed on the input shaft 12 as well.
A main transmission gear 20 is fitted with a medium-speed gear 18 which is always in mesh with the gear 7 and is rotatably loosely fitted at appropriate intervals, and is slidably spline-fitted onto the axle 19 to both the front and rear wheels 3 and 5. The low speed gear 16 and the medium speed gear 18 have a clutch pawl 1 on their opposing inner surfaces.
6', 18' are provided respectively, while both gears 16, 18
If the speed change clutch 22 is slidably fitted on the speed change shaft 13 between the clutches by spline fitting, and the speed change clutch 22 is engaged with the clutch pawl 16' of the low speed gear 16 by rotation of the shifter lever 23,
When the vehicle body 1 moves forward at a low speed and the transmission clutch 22 is engaged with the clutch pawl 18' of the medium speed gear 18, the vehicle body 1 moves forward at a medium speed and the transmission clutch 22 is moved forward at either of the gears 16, 18. The structure is such that power transmission from the input shaft 12 to the gear shift shaft 13 is cut off when the shift lever 23 is placed in a neutral position where the clutch does not engage with the gear. A spring 24 is provided, and a wire 25 for remotely rotating the shift lever 23 against the force of the spring 24 is fixed.

Further, on the intermediate shaft 14, the low speed gear 1
6 and the main transmission gear 20 on the axle shaft 19, the main transmission gear 20 is fixed to the back gear 27 with which it meshes, and is always meshed with the gear 28 on the input shaft 12. , and by the sliding of the main transmission gear 20, the main transmission gear 2
0 is provided with an idler gear 29 that meshes with the main transmission gear 2.
0 meshes with the idler gear 29, the traveling vehicle body 1
moves forward at high speed, backing up the main transmission gear 20
When engaged, the vehicle body 1 travels backward, and a main shift lever 30 for switching the main shift gear 20 to the three positions is supported under the seat 6 at right angles to the direction of travel. Main gear shift shaft 3
If the main shift lever 30 is rotated forward, the main shift lever 30 will move forward at high speed, and if the main shift lever 30 is rotated backward, the main shift lever 30 will move backward. When the gear shift clutch 22 is in the position shown in FIG.

Furthermore, as shown in FIG. 4, an auxiliary transmission shaft 32 is rotatably supported in the lower part of the seat 6 in parallel with the main transmission shaft 31, and is fixed to the left end of the auxiliary transmission shaft 32. The wire 25 from the shifter lever 23 is connected to the tip of the lever 33 so that the shift is switched from low speed forward through the neutral position to medium speed forward by rotation of the sub-shift shaft 32 in the direction of arrow A. The shaft 13 and the PTO shaft 34 for the seedling planting device 9
An inter-stock transmission mechanism 35 is provided between the
Power is transmitted from the PTO shaft 34 to the seedling planting device 9 via a telescoping shaft 36.

The seedling planting device 9 is attached to the rear of the traveling vehicle body 1 via a parallel link mechanism 37 so as to be vertically movable. A plurality of planting cases 4 are attached at appropriate intervals laterally via 39.
0. A float 4 pivotally attached to the lower surface of each planting case 40 with a pin 43 so that the front part can freely move up and down.
1, 42, and a seedling platform 44 whose upper end is inclined so as to approach the traveling vehicle body 1. At the rear end of each of the planting cases 40, there is a vertically swinging type seedling planting mechanism 4.
5 is provided in the transmission case 38 between an input shaft 46 from the telescoping shaft 36 and a transmission shaft 47 to various operating parts to turn on and off the drive of the seedling planting device 9.
A planting clutch mechanism 48 is provided for turning OFF.

As shown in FIG. 3, in this planting clutch mechanism 48, a clutch 51 is spline-fitted onto the transmission shaft 47 and is biased by a spring 50 in the direction of the driving clutch 49 on the input shaft 46. A tension spring 53 is attached to one end of the shifter lever 52 which is slidably fitted into the shifter lever 52 and which slides and operates the clutch 51, and which always urges the clutch 51 in the backward direction against the spring 50 thereof. At the same time, if a wire 54 that is pulled in a direction against the tension spring 53 is attached to the lever 52 and the tension of the wire 54 is loosened, the tension spring 53 will cause the clutch 51 to be engaged. is released, and the clutch 51 is engaged by pulling the wire 54 against the spring 53.

Further, a single-acting hydraulic cylinder 55 is provided between the traveling vehicle body 1 and the parallel link mechanism 37, and by operating the hydraulic cylinder 55 by operating a hydraulic switching valve 56, the seedling planting device The switching valve 56 is arranged at the lower right side of the seat 6 in the traveling vehicle body 1, and has a built-in vertically movable spool 57, which is shown in FIG. When the spool 57 is in the position shown in , it is a neutral position where hydraulic pressure is cut off from entering and exiting the hydraulic cylinder 55, but when the spool 57 is raised, it is in a lowered position where the hydraulic pressure in the hydraulic cylinder 55 is released, and when the spool 57 is lowered, the hydraulic cylinder 55 is released. 55 to be in the raised position where hydraulic pressure is supplied.
The spool 57 is urged by a spring 60 against an abutting body 59 protruding from a lever shaft 58 rotatably supported horizontally on the upper part of the switching valve 56, and is pressed against one end of the lever shaft 58. An interlocking arm 61 is fixed to the other end, and a lever piece 62 having a curved surface 63 is fixed to the other end, respectively.

An adjustment rod 6 is attached to a side surface of a support rod 66 rotatably pivoted on a shaft 65 to a guide rod 64 having an upwardly U-shaped cross section and extending rearward from above the switching valve 56.
7 is slidably provided with a pin 69 that fits into a long groove hole 68 bored in the adjustment rod 67, and the adjustment rod 67
The roller 70 provided at the tip of the interlocking arm 6
1, while the guide rod 6
A cable conduit 71 is engaged with the rear end of the cable conduit 6 , and a wire 72 inside the cable conduit 71 is engaged with the rear end of the adjustment rod 67 . While the other end of this cable conduit 71 is attached to the planting case 40 in the seedling planting device 9,
The other end of the wire 72 in this cable conduit 71 is
By connecting the center float 42 to the rear part thereof, if the center float 42 is tilted upward as shown by the two-dot chain line in FIG.
The adjusting rod 67 is moved back against the spring 60 via the wire 72, the switching valve 56 is switched to the raised position, and the center float 42 is moved as shown by the dashed line.
When tilted forward and downward, the rearward tension of the wire 72 is relaxed and the switching valve 56 is switched to the lowered position by the spring 60.

A handle shaft 73 is pivotally supported on the front side of the switching valve 56 in parallel with the lever shaft 58, and a fan-shaped actuating plate 75 is mounted on a sleeve 74 rotatably fitted onto the handle shaft 73. Operation lever 76
The operating lever 76 is pivotally connected to the base piece 77 with a pin 78 so that the operating lever 76 can rotate outwardly, and the operating lever 76 is fixed to the base piece 77 of the traveling vehicle body 1. The actuating plate 75 is configured to rotate at the same time as the operating plate 75 is rotated in the front-rear direction, and a spring 79 is mounted between the operating lever 76 and its base piece 77, and the spring 79 causes the operating lever 76 to rotate. It is configured to be held in an upright state and in an outwardly rotated state as shown by the two-dot chain line.

The arc surface 80 at the lower end of the actuating plate 75 has six recesses 81, 82, 83, 84, 85,
86 are provided at approximately equal intervals in the circumferential direction, while a bracket 87 attached to the side surface of the switching valve 56 is provided with a clutch rod 88 having a round tip. By pressing the clutch rod 88 in the direction of the actuating plate 75 with a spring 89, its round tip is inserted into each of the recesses 81, 82, When fitting the operating lever 76 into one of the recesses 83, 84, 85, and 86,
in the first recess 81 when the operating lever 76 is in the rearmost position, in the second recess 82 when the operating lever 76 is in the next forward position, and in the third recess when the operating lever 76 is in the next forward position. 83, a fourth recess 84 when the operating lever 76 is in the next forward position, and a fifth recess 85 when the operating lever 76 is in the further forward position.
When the operating lever 76 is in the forwardmost position, the operating lever 76 is fitted into the sixth recess 86 and held in each position in a detachable manner. A spring 90 is provided that biases 76 toward the rearmost position. Further, on the side surface of the actuating plate 75, a curved surface 6 of a lever piece 62 fixed on the lever shaft 58 of the switching valve 56 is provided.
The actuating plate 75 is provided with a protruding pin 91 that abuts and engages with the actuating plate 75.
When the operating lever 76 is in the position, the switching valve 56 is in the neutral position, but when the operating lever 76 is in the rearmost position, the switching valve 56 is in the raised position, and the operating lever 76 is in the raised position. The switching valves 56 are configured to be respectively switched to the lowered position when they are moved to the forward position by one position.

Next, a downward U-shaped bracket 9 is mounted between the switching valve 56 and the end of the handle shaft 73 so as to cover the operating plate 75 and the base of the operating lever 76.
2, a bell crank lever 93 is pivoted by a pin 75' so as to rotate in the same direction as the actuating plate 75, and one end 9 of the bell crank lever 93
3', the wire 54 from the planting clutch mechanism 48 is engaged so as to be engaged by forward rotation of the bell crank lever 93, while
An inclined surface 93a'' is provided on the lower surface of the other end 93'' of the bell crank lever 93, and a pin 94 that can come into contact with the inclined surface 93a'' is provided on the upper end of the operating plate 75, so that the operating lever 76 is moved forward from the position. In the section where the pin 94 rotates to the position, the inclined surface 9 of the pin 94
3a'', the bell crank lever 93 is rotated forward to engage the clutch, and is configured to remain engaged in the forward position as well.
A stopper hook portion 93b'' is provided at the tip of the other end portion 93'' of 3 to prevent the operation lever 76 from rotating further forward than the forwardmost position.

Furthermore, an arm 9 is attached to the right end of the sub-transmission shaft 33.
A rod 97 having one end fixed to the actuating plate 75 with a pin 96 is inserted into the hole 95' in the arm 95, and a double nut 9 is attached to the tip of the rod 97.
By fixing 7', when the operating lever 76 is in the position and the position rearward from this position, the sub-shift shaft 33 does not rotate and therefore remains in low speed forward movement, but the operating lever 76 is in the position When it is set, the sub-shift shaft 33 is rotated to the neutral position, and when the operating lever 76 is set to the forwardmost position, the sub-shift shaft 33 is rotated to the intermediate speed forward position.

Further, an arm 98 is provided at the right end of the main shift shaft 31, the tip of which engages with a double nut 88' fixed to the other end of the clutch rod 88 for positioning the actuating plate 75. When the shaft 31 is moved backward by rotating the main shift lever 30 rearward, the clutch rod 88 is moved backward through the arm 98 against its spring 89 so as to separate from the actuating plate 75. Accordingly, the actuating plate 75 is configured to be out of position.

The guide plate 99 that guides the operating lever 76 in the front-rear direction is provided with lateral grooves 99' and 99'' at certain positions as shown in FIG. It is constructed so that it can be fixed at each position of the operating lever 76 by folding it down and fitting it into the horizontal grooves 99', 99''.

In this configuration, when the operating lever 76 is in a position other than the and position, when the main shift lever 30 is placed in the sub-shift position between high-speed forward and reverse travel, the shift clutch 22 is engaged with the low-speed gear 16 by the spring 24. As a result, the traveling vehicle body 1 moves forward at a low speed.

Therefore, when the operating lever 76 is set to the position, the center float 4
2 is tilted forward and downward, the switching valve 56 is switched to the lower position and the seedling planting device 9 begins to descend, and eventually the center float 42 touches the field, and the center float 42 and the seedling planting device 9 reaches a predetermined value, the center float 42 becomes approximately horizontal, and this movement causes the wire 72 to become approximately horizontal.
is transmitted to the switching valve 56 via the switching valve 56, which switches to the neutral position and stops the descending of the seedling planting device.

Then, by rotating the same operating lever 76 to the next position, the pin 94 of the operating plate 75 abuts and engages with the inclined surface 93a'' of the lower surface of the other end 93'' of the bell crank lever 93. The bell crank lever 93 rotates forward, thereby engaging the planting clutch 48 and driving the seedling planting device 9, so that seedlings are planted in the field. The speed at which seedlings are planted is low, but after that, by moving the operating lever 76 to the forwardmost position, the transmission clutch 22 engages with the neutral gear 18 and moves forward at a medium speed. Therefore, the speed at which the seedlings are planted can be increased to a predetermined seedling planting speed by increasing the speed at which the seedlings are planted.

During this seedling planting work, when the height of the seedling planting device 9 with respect to the field surface becomes lower than a predetermined value, the center float 42 tilts forward and upward, and the related switching valve 5 is connected to the center float 42 via the wire 72.
6 is switched to the raised position, the seedling planting device 9 is raised, and when it reaches a predetermined height, the switching valve 56 is switched to the neutral position and the upward movement is stopped, and the height of the seedling planting device 9 relative to the field surface is adjusted. When the height becomes lower than a predetermined value, the center float 42 tilts forward and downward, so that the switching valve 56 is switched downward and the seedling planting device 9 is lowered, and when it reaches a predetermined height, the switching valve 56 is switched to neutral. The downward movement is stopped, and thereby the height of the seedling planting device 9 relative to the field, that is, the planting depth of the seedlings in the field can be automatically controlled to a substantially constant value.

In order for the seedlings to advance to the edge of the bank and make a turn, first, the operating lever 76 is moved to the rearmost position, so that the forward movement is decelerated to a low speed while the rotation to the position is made. During the operation, the bell crank lever 93 rotates rearward due to the rearward rotation of the actuating plate 75, the planting clutch mechanism 48 is disengaged, the drive of the seedling planting device 9 is stopped, and seedling planting is interrupted.
The switching valve 56 is forcibly switched to the raised position by pressing the lever piece 62 by the pin 91 of the operating plate 75, and the seedling planting device 9 is raised greatly.

Therefore, after the traveling vehicle body 1 is turned 180° while traveling forward at a low speed, by rotating the operating lever 76 through a position or to a position, the seedling planting device 9 will be lowered to a predetermined height relative to the field surface and will then begin to drive, and seedling planting work will begin again at a low seedling planting speed. After that, by further rotating the operating lever 76, the seedling planting work can be accelerated to the predetermined speed.

[Functions and effects of the idea]

As described above, the present invention includes a planting clutch mechanism that intermittents power to the seedling planting device, and a power transmission section from the engine to the running wheels and the seedling planting device, which changes the speed of the power transmission thereto. In a rice transplanter equipped with a transmission mechanism, the planting clutch mechanism is connected to a rotationally operated operation lever provided on the rice transplanter, and when the operation lever is rotated by a certain angle, the planting clutch mechanism is engaged. furthermore, the transmission mechanism is connected to the operating lever so that the operating lever is connected to the planting clutch at a high reduction ratio when the operating lever is in the section up to the planting clutch engagement position; The related structure is such that when the clutch is rotated further from the engaged position, the reduction ratio is switched to a low reduction ratio, so that as the operating lever is rotated, the planting clutch is engaged from the low traveling speed state and the seedlings are planted. The planting operation can be started at a low speed, and then the seedling planting speed can be increased to a predetermined speed, and conversely, as the operating lever is rotated in the opposite direction from the seedling planting state at the predetermined speed,
After the traveling speed is reduced, the planting clutch is disengaged and planting of seedlings is stopped.By rotating one operating lever in the same direction, you can start or stop seedling planting. Since the rice-transplanting machine can be stopped midway, the operation is extremely simple and there is no possibility of erroneous operation, which has the effect of significantly improving the efficiency of rice-transplanting work.

Furthermore, because the present invention is constructed as described above, as the operating lever is rotated, the planting clutch is engaged from a low traveling speed state and starts planting the seedlings at a low speed, and then the planting clutch is started at a low speed, and then the seedlings are planted. The speed can be increased to a predetermined speed, in other words, seedling planting work at a predetermined speed can be started from a low-speed seedling planting state, so there is less shock when starting seedling planting work at a predetermined speed. , it is possible to prevent a decrease in durability in various power transmission mechanisms, and furthermore, it is possible to increase the seedling planting speed to a predetermined speed by operating one control lever while checking the seedling planting at a low speed. Since it can be done quickly, it also has the effect of properly and accurately planting seedlings, such as aligning the rows of already planted seedlings accurately and accurately.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a side view of a riding rice transplanter.
The figure is a skeleton diagram of the power transmission system, Figure 4 is an enlarged sectional view of Figure 2, and Figure 5 is an enlarged sectional view of Figure 4.
6 is a sectional view taken from the side shown in FIG. 5, FIG. 7 is a plan view taken from the side shown in FIG. 6, and FIG. 8 shows an outline of the apparatus. 1... Traveling vehicle body, 3, 4... Wheels, 9... Seedling planting device, 10... Speed transmission case, 48...
Planting clutch mechanism, 55... Hydraulic cylinder, 75
... Operating plate, 76... Operating lever.

Claims (1)

[Scope of utility model registration request] A rice transplanter comprising a planting clutch mechanism for intermittent power to the seedling planting device, and a transmission mechanism for changing the speed of the power transmission from the engine to the running wheels and the seedling planting device to the power transmission section. In,
The rotary operation lever provided on the rice transplanter has a
The planting clutch mechanism is connected to the planting clutch mechanism such that when the operating lever is rotated by a certain angle, the planting clutch mechanism changes from clutch disengagement to clutch engagement, and the transmission mechanism is connected to the operating lever. The rice planting apparatus is characterized in that when the control lever is in a section up to the planting clutch engaged position, the reduction ratio is high, and when the operating lever is further rotated from the planting clutch engaged position, the reduction ratio is switched to a low reduction ratio. Machine operation device.