JPH0135617Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for controlling the running speed of a rice transplanter when it runs in a field.

Generally, when a rice transplanter makes a direction turn near the edge of a field, the drive of the seedling planting device is stopped, the seedling planting device is raised above the field, and the traveling speed is reduced to maintain safety when turning. It is done at a reduced speed. In this case, in some conventional rice transplanters, in order to simplify various operations during turning, the planting clutch in the power transmission mechanism to the seedling planting device is disconnected, which causes the seedling planting device to rise. It has been proposed that the traveling speed is switched to deceleration at the same time, or that when the seedling planting device is operated upward, the planting clutch is disengaged and the traveling speed is switched to deceleration.

However, if the running speed is always reduced when the planting clutch is cut or the seedling planting device is raised, rice transplanting operations can be performed by raising the seedling planting device or cutting the planting clutch while the rice transplanter is in the field. When traveling with the rice transplanter stopped, the traveling speed is slow, so the rice transplanter cannot move quickly within the field, resulting in reduced work efficiency.

The present invention is a rice transplanter in which the running speed is slow when the planting clutch is cut or the seedling planting device is raised, and the running speed is slow when the planting clutch is cut or the seedling planting device is raised. By giving priority to increasing the traveling speed in the matured state, the rice transplanter can be moved quickly within the field. However, recent rice transplanters are equipped with a mechanism that simultaneously stops the forward travel and the drive of the seedling transplanter when replenishing the seedling table with seedling mats. When applied to a rice transplanter equipped with a rice transplanter, there is a risk that the speed increasing mechanism may be operated by mistake while the forward travel and the seedling planting device are stopped when replenishing seedling mats. In such a case, incorrect operation of the speed increasing mechanism could cause the rice transplanter to move forward rapidly, which is extremely dangerous. Therefore, in addition to the above, the present invention provides a mechanism for stopping the forward movement and the seedling transplanting device when replenishing the seedling mats. and,
The above-mentioned inconvenience is solved by linking the speed-increasing mechanism so that the speed-increasing mechanism cannot be operated to increase the speed if the forward travel and seedling planting device are stopped when replenishing seedling pine.

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, two front wheels 3 attached to the front lower surface thereof, and a chain case 4 on the rear lower surface. The upper surface of the vehicle body frame 2 is equipped with a seat 6 and a steering handle 7, and the lower surface of the midway part of the vehicle body frame 2 is equipped with an engine 8 mounted on the front upper surface of the vehicle body frame 2. A variable speed transmission case 10 is provided for appropriately changing the speed of power from the vehicle and transmitting it to each wheel 3, 5 and a seedling planting device 9, which will be described later. As shown in FIG. 3, this transmission transmission case 10 incorporates an input shaft 12, a transmission shaft 13, and an intermediate shaft 14, which are transmitted by a belt 11 from the engine 8.
On the speed change shaft 13, 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. A main transmission gear 20 is spaced apart and rotatably loosely fitted to each other, and is slidably spline-fitted onto the axle 19 to the front and rear wheels 3 and 5.
A clutch pawl 16' is fixed to the gear 21 that meshes with the gear 21, and a clutch pawl 16',
18', 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 engaged with the low speed gear 16 by rotation of the shifter lever 23. , the traveling vehicle body 1 moves forward at a low speed, and the transmission clutch 2
2 is engaged with the medium speed gear 18, the vehicle body 1 moves forward at medium speed, and the transmission clutch 22 is engaged with both the gears 16, 18.
If you set it to the neutral position where it does not mesh with any of 18,
The structure is configured such that power transmission from the input shaft 12 is cut off, and the shifter lever 23 is provided with a spring 2 that presses and biases the speed change clutch 22 in the direction of meshing with the low speed gear 16.
4, and a wire 25 for remotely rotating the shifter lever 23 against the force of this spring 24 is fixedly attached. Further, the intermediate shaft 14
On the top is a gear 2 that is always in mesh with the low speed gear 16.
6 and a back gear 27 that meshes with the main transmission gear 20 on the axle 19 by sliding, and
An idler gear 2 that constantly meshes with the gear 28 on the input shaft 12 and meshes with the main gear 20 as it slides.
9, when the main transmission gear 20 is engaged with the idle gear 29, the traveling vehicle body 1 moves forward at high speed, and when the main transmission gear 20 is engaged with the back gear 27, the traveling vehicle body 1 is moved forward.
The main speed change lever 30 for switching the main speed change gear 20 to the three positions is mounted on the left end of a main speed change shaft 31 that is supported under the seat 6 at right angles to the direction of travel. When installed, rotating the main gear shift lever 30 in the forward direction will drive the vehicle forward at high speed, rotating the main gear shift lever 30 in the rear direction will drive the vehicle in reverse, and the main gear shift lever 30 can be moved to an intermediate position. For example, the shift clutch 22 is configured to be in a sub-shift state, and a sub-shift shaft 32 is rotatably supported in parallel with the main shift shaft 31 at the bottom of the seat 6. A wire 25 is connected from the shifter lever 23 to the tip of a lever 33 fixed to the left end of the sub-shift shaft 32 so that the rotation of the sub-shift shaft 32 in the direction of arrow A switches from low-speed forward movement to a neutral position and then to medium-speed forward movement. furthermore, the transmission 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, and the seedling planting device 9 is attached to a transmission case 38.
Planting cases 40, 4 are attached at appropriate intervals in the lateral direction via pipe-shaped support members 39, 39 on both the left and right sides of the
0,40, a float 41 with a pin 43 pivotally attached to the bottom surface of each planting case so that the front part can move up and down freely,
42, 41, and a seedling platform 44 whose upper end is inclined so as to approach the traveling vehicle body 1. A vertically swinging type seedling planting mechanism 45 is provided at the rear end of each planting case. A planting clutch mechanism 48 for turning on and off the drive of the seedling planting device 9 is provided between an input shaft 46 from the telescopic shaft 36 and a transmission shaft 47 to various operating parts. This planting clutch mechanism 48 has a transmission shaft 47 as shown in FIG.
A clutch 51, which is biased by a spring 50 in the direction of the active clutch 49 on the input shaft 46, is slidably fitted by spline engagement, and a shifter lever 52 that slides and operates the clutch 51 is fitted therein. A tension spring 53 that always urges the clutch 51 in the backward direction against the spring 50 is attached to one end, and a wire 54 that pulls the lever 52 in the direction against the tension spring 53 is attached. When the tension on the wire 54 is relaxed, the clutch 51 is disengaged by the tension spring 53, and when the wire 54 is pulled against the spring 53, the clutch 51 is engaged.

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
When the spool 57 is in the position shown in the figure, it is a neutral position that cuts off the flow of hydraulic pressure into and out of the hydraulic cylinder 55, but when the spool 57 is raised, it is in the lowered position where the hydraulic pressure inside the hydraulic cylinder 55 is released, and when the spool 57 is lowered, the hydraulic cylinder The spool 57 is switched to the raised position to supply hydraulic pressure to the spool 55.
A spring 60 is applied to an abutment body 59 protruding 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 fitted into a long hole 68 on the side surface of a support rod 66 which is rotatably pivoted by 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. A roller 70 is slidably provided with a pin 69 and is provided at the tip of the adjustment rod 67.
While abutting and engaging with the front side surface of the interlocking arm 61, a cable conduit 71 is engaged with the rear end of the guide rod 66;
The wire 72 in the cable conduit 71 is engaged with the rear end of the adjustment rod 67. The other end of the cable conduit 71 is connected to the planting case 40 of the seedling planting device 9, and the other end of the wire 72 is connected to the rear part of the center fleet 42, so that the float 42
If it slopes forward upward as shown by the two-dot chain line in the figure,
When 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 float 42 is tilted forward and downward as shown by the dashed line. The configuration is such that when the tension is loosened, 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 sleeve 74 rotatably fitted on the handle shaft 73 has a fan-shaped operating plate 75 and an operating lever. 76 and a base piece 77, and a pin 78 is pivotally connected to the base piece 77 so that the operation lever 76 can rotate outward, and the operation lever 76 is fixed to the base piece 77 in the longitudinal direction of the vehicle body. At the same time as the rotation of the actuating plate 75
At the same time, a spring 79 is installed between the operating lever 76 and its base piece 77, and the spring 79 allows the operating lever 76 to move between the upright state and the outer position as shown by the two-dot chain line. Hold it in the rotated position.

The circular arc surface 80 at the lower end of the operating body 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, so that the round tip When the operating lever 76 is in the rearmost position, the operating lever 76 is inserted into the first recess 81, and when the operating lever 76 is in the forward position, the operating lever 76 is inserted into the second recess 82. Next, 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 when the operating lever 76 is in the most forward position. The actuating plate 75 is provided with a spring 90 that urges the operating lever 76 toward the rearmost position. . The switching valve 56 is disposed on the side surface of the actuating plate 75.
The lever piece 62 fixed on the lever shaft 58 in
By connecting the operating plate 75 to the switching valve 56 by protruding a pin 91 that abuts and engages the curved surface 63 of the operating lever 76, the switching valve 56 is in the neutral position when the operating lever 76 is in the position. When the operating lever 76 is moved to the rearmost position, the switching valve 56 is placed in the raised position, and when the operating lever 76 is placed one position forward, the switching valve 56 is placed in the lowered position.

Further, a downward U-shaped bracket 92 is installed 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.
Inside, the bell crank lever 93 is connected to the operating plate 7.
A pin 75 is pivotally attached to one end 93' of the bell crank lever 93 so as to freely rotate in the same direction as the bell crank lever 93.
The wire 54 from the planting clutch mechanism 48 is
When the bell crank lever 93 is rotated in the forward direction, the clutch is engaged, and on the lower surface of the other end 93'' of the bell crank lever 93,
An inclined surface 93a'' is provided, and a pin 94 capable of contacting the inclined surface 93a'' is provided at the upper end of the actuating plate 75, and the inclined surface of the pin 94 is provided at the upper end of the operating plate 75. 93a'', the bell crank lever 93 is rotated forward to engage the clutch, and the clutch remains engaged even in the forward position.The other end of the bell crank lever 93 A stopper hook portion 93b'' is provided at the tip of the portion 93'' 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 93 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 is configured to move backward away from the actuating plate 75 against the force, and the actuating plate 75 is released from its 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 positions as shown in FIG.
At the 9' and 99'' positions, the operating lever 76 is tilted outward and fitted into the lateral grooves 99' and 99'', so that the operating lever 76 can be fixed at each position.

A sleeve 100 is rotatably fitted on the sub-shift shaft 32 near the lever 33 at its left end, and a pedal 101 located under the seat 6 is mounted on one side of the sleeve 100 on the other side. The holding piece 102 is integrally provided, and the other end 101' of the pedal 101 is brought into contact with the lower surface of the lever 33,
The configuration is such that when the pedal 101 is depressed downward against the coiled spring 103, the sub-shift shaft 32 is rotated in the direction of arrow A via the lever 33, resulting in medium speed forward movement.
Further, a lock pin 105 that can be fitted into a hole 104 bored in the vehicle body frame 2 is slidably provided on the holding piece 102 in the axial direction, and the lock pin 105 is pulled out from the hole 104 by a spring 106. On the other hand, an inclined cam 107 is provided on the inner surface of the lever 33 and contacts one end of the lock pin 105, so that when the lever 33 rotates in the direction of arrow A, the inclined cam 107 biases the lock pin 105. is configured to fit into a hole 104 in the vehicle body frame 2. Furthermore, 108,1
09 is a stopper that restricts the rotation range of the pedal 101.

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 between high-speed forward and reverse travel, the high-speed clutch 22 is engaged with the low-speed gear 16 by the spring 24, and the high-speed clutch 22 is engaged with the low-speed gear 16. The vehicle body 1 will move forward at low speed. Then, when the operating lever 76 is moved to the position,
Since the float 42 is tilted forward and downward when the seedling planting device 9 is in the ascending state, the switching valve 56 is switched to the lower position, and the seedling planting device 9 begins to descend.
Eventually, when the float 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 move to the neutral position. Then, 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 at the time of seedling planting is slow, but in order to do this at a high speed, by moving the operating lever 76 to the forwardmost position beyond the position, the speed change clutch 22 is moved to the intermediate speed gear 18. The seedlings are planted at a speed faster than the slow forward movement by moving forward at a medium speed.

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 fleet 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 operating 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 59 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 position relative to the field scene by rotating the operating lever 76 to or from the position. After descending to a certain height, the machine 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 shifter lever 23, the related transmission clutch 22 is in a neutral position in which it does not mesh with any of the medium and low speed gears 16, 18, and power transmission from the engine 8 to the wheels 3, 5 and the seedling planting device 9 is interrupted. 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.

Then, by setting the operating lever 76 to the position, the planting clutch 48 is disengaged, and when the seedling planting device 9 is raised to move forward at low speed, when the pedal 101 is depressed, the sub-shift shaft 32 rotates in the direction of the arrow A. Then, the speed change clutch 22, which is interlocked with this via the wire 25 and the shifter lever 23, meshes with the medium speed gear 18.
Forward running, the speed is increased from low speed to medium speed.

However, when the operating lever 76 is set to the position when replenishing seedling mats to the seedling platform 44 in the seedling planting device 9, the rotation of the sub-transmission shaft 32 and its lever 33 in the direction of arrow A causes the inclined cam 107 on the side surface thereof to be moved.
Since the lock pin 106 that comes into contact with the body frame 2 fits into the hole 104 of the vehicle body frame 2 against the spring 106,
As a result, the pedal 101 is locked in a state where it cannot be depressed.

Therefore, according to the present invention, when disengaging the planting clutch or raising the seedling planting device, the negative effects of slowing down the traveling speed, that is, slowing down the movement speed of the rice transplanter in the field, can be avoided by using the pedal. Although this can be improved by using a speed increasing mechanism such as 101, if the forward travel and driving of the seedling planting device are stopped when replenishing the seedling mats, the speed increasing mechanism will be locked inoperable, so There is no risk of erroneously operating the speed increasing mechanism, and there is an effect that seedling pine can be safely supplied.

[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 cross-sectional view of FIG. 5, FIG. 7 is a plan view of FIG. 6, FIG. 8 is a schematic view of the device, and FIG. 9 is a sectional view of FIG. An enlarged sectional view, FIG. 10 is a cross-sectional view of FIG.
FIG. 1 is a sectional view taken along line XI-XI in FIG. 9. 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, 16...
Low speed gear, 18... Medium speed gear, 22... Speed change clutch, 32... Sub-shift shaft, 55... Hydraulic cylinder, 56... Switching valve, 48... Planting clutch mechanism, 76... Operation lever, 101 ...Pedal, 1
05...Lock pin.

Claims (1)

[Scope of utility model registration request] Disconnect the planting clutch mechanism in the seedling planting device, or
In a rice transplanter comprising a traveling transmission mechanism that moves forward at low speed when the seedling planting device is raised and has a neutral position that cuts off power transmission to the traveling wheels and the seedling planting device, the traveling transmission mechanism includes a planting device. A speed increase operation mechanism is provided that can preferentially increase the traveling speed when the clutch mechanism is disengaged or the seedling planting device is raised, and the speed increase operation mechanism has a speed change position of the traveling transmission mechanism that is set to the above-mentioned position. When the neutral position of
An operating device for a rice transplanter comprising a mechanism that locks the speed increasing operating mechanism so that it cannot be operated.