JPH0132831Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating device in which the traveling speed of a rice transplanter is changed, the raising/lowering operation of a seedling planting device, and the intermittent operation of a planting clutch are appropriately related to each other.

Generally, rice transplanting is carried out by lowering the seedling planting device while moving forward at an appropriate speed, then engaging the planting clutch and planting the seedlings. When the rice planting process has progressed to the edge of the ridge, the planting clutch is disconnected and the seedlings are planted. The rice transplanter is carried out in the order of raising the rice transplanter, turning in a 180° direction while changing the forward speed, and then starting the rice transplanting process again as described above.The rice transplanter is also equipped with a traveling speed change mechanism that allows it to travel backwards. Therefore, the rice transplanter requires three operations: changing the running speed, raising and lowering the seedling planting device, and intermittent operation of the planting clutch.

In this case, in conventional rice transplanters, the raising and lowering operation of the seedling transplanter and the changing operation of the traveling speed, including backward running, are not linked, so when the seedling transplanter is lowered during rice planting work in the field, There is a risk of accidentally setting the main speed change lever to the reverse position. If you start reversing with the seedling planting device lowered, you may crush the carefully planted seedlings or cause the float to fall into the field. There were cases where it was buried inside and damaged.

The present invention, in this type of rice transplanter, links the raising and lowering operation of the seedling transplanting device to the speed change operation including backward travel, so that when the main gear shift lever is placed in the backward position, the seedling transplanting device rises. This eliminates the drawbacks of

However, if the raising/lowering operation of the seedling planting device and the main gear shift lever are simply linked together as described above, if the main shifting lever is set to the reverse travel position and the seedling planting device is lowered slightly to lower the seedling device, it will not work. The main gear shift lever is removed from the reverse position in conjunction with The lever is connected so that when the main gear shift lever is put in the reverse position, the seedling planting device will move upwards, but even if the seedling planting device is lowered with the main gear shift lever in the reverse position, the main gear shift lever will not move backward. This eliminates the above-mentioned inconvenience by preventing the device from falling out of position.

The present invention will be explained below with reference to the drawings of the embodiments. In the drawings, reference numeral 1 indicates a running vehicle body, and the running vehicle body 1 includes a vehicle body frame 2 and two front wheels 3 attached to the lower front surface of the vehicle body frame 2.
and the rear 2 which is attached to the lower surface of the rear via the chain case 4.
A seat 6 and a steering handle 7 are provided on the upper surface of the vehicle body frame 2, and a seat 6 and a steering handle 7 are provided on the upper surface of the vehicle body frame 2, and a seat 6 and a steering handle 7 are provided on the lower surface of the midway portion of the vehicle body frame 2. and each wheel 3,5
A variable speed transmission 10 for transmitting the information to a seedling planting device 9, which will be described later, is also provided. As shown in FIG. 3, this transmission transmission 10 includes an input shaft 12 which is driven by a belt 11 from the engine 8;
Built-in speed change shaft 13 and intermediate shaft 14, speed change shaft 13
Above, a low-speed gear 16 that is always in mesh with a small gear 15 fixed on the input shaft 12, and a medium-speed gear 18 that is always in mesh with a large gear 17 that is also fixed on the input shaft 12 are arranged at appropriate intervals. The main transmission gear 20, which is rotatably loosely fitted and slidably spline-fitted onto the axle 19 of the front and rear wheels 3, 5, is fixed to the gear 21 that meshes with the main transmission gear 20. Clutch pawls 16' and 18' are provided on the opposing inner surfaces, and a speed change clutch 22 is slidably spline-fitted onto the speed change shaft 13 between the gears 16 and 18, and the speed change clutch 22 is connected to the shift lever 23. When the gear 16 is engaged with the low speed gear 16 by rotation, the traveling vehicle body 1 moves forward at a low speed, and the transmission clutch 22 is engaged with the width gear 16.
8, the traveling vehicle body 1 moves forward at a medium speed, and when the transmission clutch 22 is placed in a neutral position where it does not mesh with either of the gears 16 and 18, power transmission from the input shaft 12 is cut off. 2
3 is provided with a spring 24 that presses and biases the speed change clutch 22 in the direction of meshing with the low speed gear 16,
A wire 25 for remotely rotating the shifter lever 23 against the force of this spring 24 is fixedly attached. Further, on the intermediate shaft 14, there is a back gear 26 that is always meshed with the low speed gear 16 and a back gear 27 that is meshed with the main transmission gear 20 on the axle 19 by sliding.
The main speed change gear 20 is fixed to the main speed change gear 20, and has an idler gear 29 which is always in mesh with the gear 28 on the input shaft 12 and meshed with the main speed change gear 20 when the main speed change gear 20 slides.
When the main transmission gear 20 is engaged with the idle gear 29, the vehicle body 1 moves forward at high speed, and when the main transmission gear 20 is engaged with the back gear 27, the vehicle body 1 travels backward. The main gear shift lever 30 for switching to the three positions is attached to the left end of a main gear shift shaft 31 supported at right angles to the traveling direction at the bottom of the seat 6, and the main gear shift lever 30 is rotated forward. If the main shift lever 30 is rotated in the backward direction, the vehicle will travel backward at high speed, and if the main shift lever 30 is moved to an intermediate position, the vehicle will be in a sub-shift state using the shift clutch 22. There is also an auxiliary transmission shaft 32 at the bottom of the seat 6.
The wire 25 from the shifter lever 23 is connected to the tip of a lever 33 that is rotatably supported in parallel with the main shift shaft 31 and fixed to the left end of the auxiliary shift shaft 32.
By rotating the sub-shift shaft 32 in the direction of arrow A, the connection is made to switch from low-speed forward movement through the neutral position to medium-speed forward movement, and furthermore, between the speed change shaft 13 and the PTO shaft 34 for the seedling planting device 9. The inter-stock transmission mechanism 3
5 is provided, and 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.
Planting cases 40, 4 are attached at appropriate intervals in the lateral direction via pipe-shaped support members 39, 39 on both left and right sides of the
0, 40, consists of a pin 43 pivoted to the lower surface of each planting case 41, 42, 41 so that the front part can freely move up and down, and a seedling stand 44 whose upper end is inclined so as to approach the traveling vehicle body 1, A vertically swinging seedling planting mechanism 45 is provided at the rear end of each planting case, and the transmission case 3
A planting clutch mechanism 48 for turning on and off the drive of the seedling planting device 9 is provided in the seedling planting device 8 between an input shaft 46 from the telescopic shaft 36 and a transmission shaft 47 to various operating parts. This planting clutch mechanism 48 is
As shown in FIG.
A clutch 51 that is biased by a spring 50 in the direction of the upper active clutch 49 is slidably fitted by spline engagement, and the clutch 51 is attached to one end of a shifter lever 52 that slides and operates the clutch 51. A tension spring 53 is attached which always urges the lever 52 in the backward direction against the spring 50, and a wire 54 is attached to the lever 52 so as to pull the lever 52 in a direction against the tension spring 53. When the tension is loosened, the clutch 51 is released by the tension spring 53,
Clutch 51 is engaged by pulling wire 54 against spring 53.

Furthermore, 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 switching valve 56, the seedling planting device 9 is raised and lowered. The switching valve 56 is disposed at the lower right side of the seat 6 in the traveling vehicle body 1, and has a built-in vertically movable spool 57, and the spool 57 is connected to the fourth
The position shown in the figure is a neutral position that cuts off the flow of hydraulic pressure into and out of the hydraulic cylinder 55; however, when the spool 57 rises, the hydraulic pressure inside the hydraulic cylinder 55 is released, and when the spool 57 descends, the hydraulic cylinder 55 The spool 57 is connected to a contact body 59 that projects from a lever shaft 58 rotatably supported horizontally on the upper part of the switching valve 56. An interlocking arm 61 is fixed to one end of the lever shaft 58, and a lever piece 62 having a curved surface 63 is fixed to the other end.

An adjustment rod 67 is attached to the side surface of a support rod 66 which is rotatably pivoted on a shaft 65 to a guide rod 64 having an upwardly U-shaped cross section and extending rearward from the upper surface of the switching valve 56, and a pin that fits into a long groove hole 68 of the support rod 66. A roller 70, which is slidably provided at 69 and is provided at the tip of the adjusting rod 67, abuts and engages with the front side surface of the interlocking arm 61;
A cable conduit 71 is attached to the rear end of the guide rod 66, and a wire 72 in the cable conduit 71 is attached to 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,
By connecting the other end of the wire 72 to the rear part of the center float 42, when the float 42 tilts forward upward as shown by the two-dot chain line in FIG. When the switch valve 56 is moved back against the resistance and the switch valve 56 is switched to the raised position, and the float 42 is tilted forward and downward as shown by the dashed line, the rearward tension of the wire 72 is loosened and the switch valve 56 is moved by the spring 60. It is configured to switch to the lowered position.

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 sleeve 74 rotatably fitted onto the handle shaft 73 has a fan-shaped plate 75 and an operating lever 76. The operating lever 76 is fixed to the base piece 77 of the
A pin 78 is pivotally attached to the operating lever 76 so that the operating lever 76 can rotate outwardly, and the operating plate 75 rotates simultaneously with the rotation of the operating lever 76 in the longitudinal direction of the vehicle body. A spring 79 is installed between the operating lever 76 and its base piece 77, and the spring 79 holds the operating lever 76 in the upright state and in the outwardly rotated state as shown by the two-dot chain line. .

The circular 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 has
A clutch rod 88 having a round tip is slidably provided in the direction of the center of the handle shaft 73, and the clutch rod 88 is biased toward the actuating plate 75 by a spring 89. In fitting the operating lever 76 into each recess, the operating lever 76 is inserted into the first recess 81 when the operating lever 76 is in the rearmost position, the operating lever 76 is inserted into the second recess 82 when the operating lever 76 is in the next forward position, and the operating lever 76 is inserted into the second recess 82 when the operating lever 76 is in the next forward position. When in the forward position, the third recess 83
, in the fourth recess 84 when the operating lever 76 is in the next forward position, in the fifth recess 85 when the operating lever 76 is in the further forward position, and in the fifth recess 85 when the operating lever 76 is in the further forward position.
is configured to fit into the sixth recess 86 and detachably hold each position when the lever is in the forwardmost position, and the operating plate 75 biases the operating lever 76 toward the rearmost position. A spring 90 is provided. A pin 91 that abuts and engages the curved surface 63 of the lever piece 62 fixed on the lever shaft 58 of the switching valve is provided protruding from the side surface of the operating plate 75 to connect the operating plate 75 to the switching valve 56. The operating lever 76
When the operating lever 76 is in the forward position, the switching valve 56 is in the neutral position, but if the operating lever 76 is moved to the rearmost position, the switching valve 56 is in the raised position, and if the operating lever 76 is moved one position forward, the switching valve 56 is in the neutral position. The configuration is such that each switch is switched to a lowered position.

Further, a bell crank lever 93 is mounted in a downward U-shaped bracket 92 mounted between the switching valve 56 and the end of the handle shaft 73 so as to cover the front operating plate 75 and the base of the operating lever 76. The pin 75' is pivotally mounted so that it can freely rotate in the same direction as the
The wire 54 from the planting clutch mechanism 48 is engaged with one end 93' of the bell crank lever 93 so that the clutch is engaged by forward rotation of the bell crank lever 93. The lower surface of the end portion 93'' is provided with an inclined surface 93a'', and the upper end of the actuating plate 75 is provided with an inclined surface 93a''.
A'' is provided with a pin 94 that can come into contact with the inclined surface 93a'', and in the section in which the operating lever 76 is rotated from the position to the forward position, the bell crank lever 93 is rotated forward by the pin 94 coming into contact with the inclined surface 93a''. The clutch is engaged by moving the clutch, and the clutch is kept engaged even at a position in front of the clutch. Note that the other end 93'' of this bell crank lever 93
A stopper hook portion 93b'' is provided at the tip of the lever 76 to prevent the operating lever 76 from rotating further forward than the forwardmost position.

Further, an arm 95 is provided at the right end of the sub-transmission shaft 33.
A rod 97 with one end pivotally connected to the actuating plate 75 by a pin 96 is inserted into the hole 95' in the arm 95.
By inserting the double nut 97' into the tip and fixing the double nut 97' to its tip, the sub-shift shaft 33 does not rotate when the operating lever 76 is at this position or at a position rearward from this position, and therefore, low-speed forward movement is prevented. However, when the operating lever 76 is moved to the position, the sub-shift shaft 3
3 to the neutral position and the operating lever 76 to the forwardmost position, the auxiliary transmission shaft 33 is rotated to the medium speed forward position.

Further, at the right end of the main transmission shaft 31, an arm 9 whose tip engages with a double nut 88' fixed to the other end of a clutch rod 88 for positioning the actuating plate 75 is provided.
8 is provided, and when the main shift shaft 31 is moved backward by rotating the main shift lever 30 rearward, the clutch rod 88 is moved by its spring 89 via the arm 98.
The actuating plate 75 moves backward to move away from the actuating plate 75, and the actuating plate 75 becomes unpositioned, and the operating lever 7
6 is configured to automatically rotate into position by a spring 90.

The guide plate 99 that guides the operating lever 76 in the front-rear direction is provided with lateral grooves 99' and 99'' at positions as shown in FIG.
By tilting the operating lever 76 outward at the 9', 99'' position and fitting it into the horizontal grooves 99', 99'',
The operating lever 76 is configured to be fixed at each position.

In this configuration, when the operating lever 76 is in a position other than the and position, when the main shift lever 30 is set to the auxiliary shift position intermediate between high-speed forward and reverse travel, the gear shift clutch 22 is engaged with the low-speed gear 16 by the spring 24, and the shift clutch 22 is engaged with the low-speed gear 16 by the spring 24. The vehicle body 1 will move forward at low speed.

Therefore, when the operating lever 76 is moved to the position, the changeover valve 56 is switched to the lower position because the float 42 is tilted forward and downward when the seedling planting device 9 is in the ascending state, and the seedling planting device 9 begins to descend. When the float eventually touches the field and the height between the float and the seedling planting device reaches a predetermined value, the float becomes approximately horizontal, and this movement is transmitted to the switching valve 56 via the wire 72, causing the switching valve 56 to become neutral. After switching to the position, the seedling planting device stops descending. Then, by rotating the same operating lever 76 to the next position, the pin 94 of the operating plate 75 comes into contact with the inclined surface 93a'' on the lower surface of the other end 93'' of the bell crank lever 93, and the bell crank is activated. Lever 9
3 rotates forward, and as a result, the planting clutch 4
8 is inserted and the seedling planting device 9 is driven, so that seedlings are planted in the field.

The forward speed during this seedling planting is slow, but in order to do this at a faster speed, move the operating lever 76 to the forwardmost position beyond the position.
The transmission clutch 22 meshes with the medium speed gear 18 to move forward at a medium speed, and seedlings are planted at a speed faster than the slow forward movement.

During this seedling planting, when the height of the seedling planting device with respect to the field surface becomes lower than a predetermined value, the float tilts forward and upward, and the related switching valve 56 is switched to the raised position via the wire 72. When the seedling planting device is raised and reaches a predetermined height, the switching valve is switched to neutral and the upward movement is stopped, and when the height of the seedling planting device with respect to the field surface becomes lower than a predetermined value,
As the float tilts forward and downward, the switching valve 56 is switched to the downward direction and the seedling planting device is lowered, and when it reaches a predetermined height, the switching valve is switched to neutral and the downward movement is stopped. As a result, the height of the seedling planting device 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 move the operating lever 76 to the rearmost position, so that the forward movement is decelerated to a low speed while the rotation to the position is made. During operation, the bell crank lever 93 rotates rearward due to the rearward rotation of the actuating plate 75, the planting clutch mechanism 48 is disconnected, and the drive of the seedling planting device is stopped. After seedling planting is interrupted, the switching valve 56 The lever piece 62 is connected to the pin 91 of the actuating plate 75.
When pressed, the seedling planting device 9 is forcibly switched to the raised position, and the seedling planting device 9 is raised greatly. Therefore, after turning the traveling vehicle body 1 in a 180° direction while traveling forward at a low speed, the seedling planting device 9 is moved to a predetermined height relative to the field by rotating the operating lever 76 to or from the position. After descending until it reaches a certain point, it starts driving and can go back to the state of planting seedlings.

During seedling planting, when the seedling mats on the seedling platform 44 in the seedling planting device 9 run out or there are only a few remaining, and it is necessary to replenish the seedling mats, the operating lever 76 is moved between the medium speed forward position and the low speed forward position. By positioning it between the forward position and the forward position, the rod 97, sub-shift shaft 33, and wire 2
5 and shift lever 23, the transmission clutch 22 is in a neutral position in which it does not mesh with either the medium or low speed gears 16, 18, and the power is not transmitted from the engine 8 to each wheel 3, 5 and the seedling planting device 9. Since this is interrupted, the forward movement of the traveling vehicle body 1 and the driving of the seedling planting device 9 are simultaneously stopped. When the seedling pine has been supplied to the seedling table 44 in this state, the previous seedling planting state is immediately returned to by rotating the operating lever 76 to that position.

Furthermore, if the main shift lever 30 is mistakenly operated to the reverse travel position while the seedling planting device 9 is lowered with the operating lever 76 in a position other than the above position, the main shift shaft 31 to which the main shift lever 30 is attached
When the clutch rod 88 is rotated, the clutch rod 88 for holding the position relative to the actuating plate 75 is moved through the arm 98 attached thereto.
moves backward against the spring 89 and comes out of the recess, releasing the positional hold on the actuating plate 75, so the actuating plate 75 and the operating lever 76 are moved to the rearmost position by the force of the spring 90 provided thereon. rotate,
Then, the planting clutch 48 is disengaged and the drive of the seedling planting device 9 is stopped, and the switching valve 56 is switched to the raised position and the seedling planting device is raised greatly.

On the other hand, when the main shift lever 30 is in the reverse travel position, the clutch rod 88 has come out of the recess in the operating plate 75, and in this state, the operating lever 76
Even if the clutch rod 88 is rotated from position to position,
And, since the main transmission shaft 31 is not rotated in the opposite direction from the reverse travel position via the arm 98,
Even if the seedling planting device is lowered while the vehicle is traveling backwards, the vehicle will not stop traveling backwards.

Therefore, according to the present invention, if the main gear shift lever is mistakenly put into reverse mode while the seedling planting device is lowered,
The seedling planting device can be raised to prevent inconveniences caused by erroneously operating backwards, and even if the seedlings planting device is lowered while traveling backwards, it does not stop traveling backwards.
Since the seedling planting device can be raised and lowered freely while traveling backwards, it has the effect of eliminating the inconvenience when putting the rice transplanter into a garage while traveling backwards.

[Brief explanation of the drawing]

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 in FIG. 5, FIG. 7 is a plan view taken from the side shown in FIG. 6, and FIG. 8 is a diagram showing an outline of the apparatus. 1... Running vehicle body, 3, 5... Running wheels, 9...
Seedling planting device, 10... Variable speed transmission case, 30
...Main gear shift lever, 31...Main gear shift shaft, 55...
Hydraulic cylinder, 56...Switching valve, 76...Operation lever, 75...Operating plate, 88...Clutch rod, 8
1 to 86... recess, 89... spring, 98... arm.

Claims (1)

[Scope of utility model registration request] a lifting mechanism that lifts and lowers the seedling planting device relative to the field;
and a rice transplanter equipped with a traveling transmission mechanism including a backward traveling position, the operating lever for the raising and lowering mechanism of the seedling planting device is provided with a means for biasing the operating lever in the direction of the raised position, and a means for biasing the operating lever in the direction of the raised position; A holding mechanism is provided to detachably hold the operating lever in a certain position, and the holding mechanism and the traveling transmission mechanism are connected to each other so as to release the position of the operating lever by the holding mechanism when the traveling transmission mechanism is set to travel in reverse. An operating device for a rice transplanter consisting of: