JPH0518524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rice transplanter, which is a rotary seedling transplanting device in which a single rotating case is equipped with a plurality of seedling planting bodies.

[Conventional technology]

Conventionally, this type of seedling planting device has been used, for example, in the
As described in Publication No. 27762, the base end of a seedling plant having a seedling dividing claw at the tip is connected to the fuselage side via a fan link, while the middle part of the seedling plant is connected to the engine. The tip of a crank, which is fixed to a claw shaft that is rotationally driven by the crank, is pivoted, and the rotation of the crank causes the seedling plant to be vertically swung so that the tips of the split claws draw a long elliptical closed loop locus in the vertical direction. By configuring it in a crank type to move it,
The structure was such that the seedlings were separated from the seedling pine on the seedling stand and then planted in the field, but the vibration was extremely large due to the vertical movement of the seedlings.
There were problems such as slow planting speed.

Therefore, recently, in order to reduce vibration and improve planting speed, for example,
Publication No. 27762, Publication No. 47-35534, and Publication No. 47-35534
As described in Publication No. 47-28104, etc., a claw drive shaft, which is rotatably driven by transmission of power from a power source, is pivotally supported in a substantially horizontal direction on the machine body near the seedling stand, and the claw drive shaft A plurality of planting shafts are each pivotally supported on the outer periphery of a rotating case attached to the shaft in parallel with the claw drive shaft, and a seedling plant equipped with a split claw is placed on each of the planting shafts. Each of the seedlings is mounted in a position facing the stand, and a gear train is provided in the rotating case to transmit inconstant rotation to each of the planting shafts as the rotating case rotates. A rotary seedling planting device has been proposed which is configured to swing and rotate the plant so that the tip of the dividing claw of the seedling plant draws a long elliptical closed loop locus in the vertical direction.

[Problem to be solved by the invention]

However, compared to the crank-type seedling planting device, this rotary seedling planting device has the advantage of having less vibration and being able to greatly increase the seedling planting speed. Because the circumferential speed of the splitter is fast, the seedlings that were once planted in the field are often lifted up together with the splitting claws when the splitting claws come out of the field, making it less reliable to plant the seedlings. I had a problem.

An object of the present invention is to solve the above-mentioned problems in a rotary seedling planting device without causing a decrease in durability or an increase in size.

[Means to solve the problem]

In order to achieve this object, the present invention includes a claw drive shaft that is rotatably driven by power transmission from a power source and is pivotally supported in a substantially horizontal direction on the machine body near the seedling stand.
A plurality of planting shafts are each pivotally supported on the outer periphery of a rotating case attached to the claw drive shaft in parallel with the claw drive shaft, and each planting shaft is provided with a seedling planting body having a split claw, While each is mounted in a posture facing the seedling platform side, a gear train is provided in the rotating case to transmit inconstant rotation to each of the planting shafts as the rotating case rotates, In the seedling planting device, each of the seedling plants is configured to swing and rotate so that the tips of the split claws of the seedling plants draw vertically long elliptical closed loop loci. A pushing tool is provided on the body to push out the seedlings divided by the splitting claws of the seedling plant toward the tips of the splitting claws, and a swinging lever having one end engaged with the pushing tool is pivotally mounted. Further, each of the seedling plants is provided with a spring that presses and biases the extruder in the forward direction, and the swing lever is connected to a cam on a drive shaft that is fixed non-rotatably to the rotating case. As the seedling plant swings, the pushing tool moves forward under the pressure of the spring and then moves backward against the spring. During one rotation, the splitting claws of one of the seedling plants take out the seedlings from the seedling pine in the seedling planting table, and the timing when the splitting claws of the other seedling plants remove the seedlings from the field. The timing is appropriately shifted from the timing of planting the seedlings, while the split claw of one of the seedling plants takes out the seedlings from the seedling pine on the seedling stand during one rotation of the rotating case. The configuration is such that the timing when the extrusion tool for other seedling plants moves backward against the spring is appropriately shifted.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, drawings of an embodiment of the present invention in which the present invention is applied to a walking-type two-row rice transplanter will be described.

In the figure, reference numeral 1 designates a float 6 that slides in the field B on the lower surface of a body 5 that also serves as a transmission case, which is equipped with an engine 2 at the front and a seedling stand 3 and a handle 4 at the rear. A rice transplanter is shown in which wheels 7 are mounted on both the left and right sides of a machine body 5 via swing cases 8, and the machine body 5 of the rice transplanter 1 is provided with a power source from the engine 2 at a position in front of the seedling stand 3. A claw drive shaft 9 that is rotationally driven is pivotally supported in a substantially horizontal direction, and a rotary seedling planting device 10, which will be described in detail later, is attached to both left and right ends of the claw drive shaft 9.

As shown in FIGS. 3 to 5, this rotary seedling planting device 10 includes an oval-shaped rotating case 11 that is fitted and fixed to the end of a claw drive shaft 9 that is pivotally supported on a machine body 5.
The rotating case 11 rotates in the right direction by the claw shaft 9 as shown by an arrow A in a side view of the rice transplanter 1.
A sun gear 12 is rotatably fitted onto the pawl drive shaft 9 in the machine body 5, and the sun gear 12 is non-rotatably locked to the machine body 5 via a suitable rotational phase adjusting means 13. ing.

At multiple locations on the outer periphery of the rotating case 11, that is, at least on both left and right sides, push-out tools (described later) are provided at equal distances from the claw drive shaft 9.
Drive shafts 14 for the claw drive shafts 9 are each supported in parallel with the claw drive shafts 9, and both drive shafts 14 are fixed to the rotating case 11 in a non-rotatable manner. A planetary gear 15 having the same number of teeth as the sun gear 12 is rotatably fitted. Further, inside the rotating case 11, a claw drive shaft 9 and both drive shafts 1 are provided.
An intermediate shaft 16 is pivotally supported at an intermediate position between the two intermediate shafts 16, and an intermediate gear 17 that meshes with both the sun gear 12 and the planetary gears 15 is fitted onto both intermediate shafts 16 to form a gear train mechanism.

On the other hand, a sleeve-shaped planting shaft 18 is rotatably fitted onto both drive shafts 14 in the rotating case 11, and one end of the sleeve-shaped planting shaft 18 protrudes outside the rotating case 11. At its protruding end, a seedling plant body 20 is provided with a seedling dividing claw 19 at the tip.
are fixed to each other with the divided claws 19 facing toward the seedling platform 3.

The planetary gears 15 on both drive shafts 14 have pawls 21 projecting toward the planting shaft 18.
The planting shaft 18 is each integrally provided with claws 22 that protrude toward the planetary gear 15, and both claws 21,
22 are configured so that they contact each other when the planetary gear 15 rotates clockwise, and separate from each other when the planetary gear 15 rotates counterclockwise, and between the two pawls 21 and 22, the two pawls 21 and 22 are in contact with each other. A ring-shaped spring body 23 that biases in the corresponding direction is provided, and the ring-shaped spring body 23 is configured to elastically transmit the left rotation of the planetary gear 15 to the planting shaft 18.

On the other hand, each seedling plant 20 has its divided claws 19.
A hollow guide shaft 27 extending in parallel with the guide shaft 27 is provided to be movable up and down, and a pushing tool 28 is provided at the lower end of the hollow guide shaft 27,
7 are each provided with a spring 29 that presses them downward. A swing lever 30 is disposed inside each of the seedling plants 20, and one end of the swing lever 30 is rotatably connected with a pin 31, while the other end 32 is rotatably attached to the upper end of the guide shaft 27. The drive shaft 14 is configured to engage freely and non-slidably so that the pushing tool 28 moves up and down as the swinging lever 30 moves up and down. , 20 seedling plants
A cam 33 is fixed to the drive shaft 14 inside,
The middle part of the swing lever 30 is brought into contact with the outer circumferential surface of the cam 33, and the outer circumferential surface of the cam 33 is pressed against the outer circumferential surface of the cam 33 when each of the seedling plants 20 comes near its lower limit. When the movable lever 30 rotates downward under the biasing force of the spring 29 and each seedling plant 20 rises away from the field scene B as the rotary case 11 rotates, the movable lever 30 is constructed in such a shape that it rotates upward against the spring 29. In this case, the other end 32 of the swing lever 30 is engaged between the two collars 34 and 35 fixed to the upper end of the guide shaft 27, and both the collars 34 and 35 are attached to the inside of the seedling plant 20. It is slidably fitted into a cylinder bore 36 formed concentrically with the axis of the guide shaft 27, and a cushion body 38 made of rubber is provided at the portion of the bearing 37 relative to the guide shaft 27. There is.

Furthermore, both intermediate shafts 16 in the rotating case 11
A fan-shaped cam 24 is fixed to each of the rotation case 11, and a stopper arm 25 is integrally provided to each of the planting shafts 18 in the rotation case 11, so that the seedling planting body 20 is moved in the direction indicated by the arrow A of the rotation case 11. As it rotates in the direction, on the side facing the seedling platform 3, from a height position corresponding to the lower end of the seedling platform 3 (that is, a position where the rotating case 11 is approximately horizontal) to a position slightly before the lower limit of descent. Only in the section where the splitting claw 19 descends to the position where the splitting claw 19 has penetrated into the field scene B to a predetermined depth, the stopper arm 25 on the planting shaft 18 moves against the arcuate outer circumferential surface 26 of the cam 24 on the intermediate shaft 16. By abutting against this, the counterclockwise rotation of the planting shaft 18 is delayed only in the above-mentioned section.

During one rotation of the rotating case 11, as shown _in FIG. Divided claw 19 in 20
However, while invading the seedling pine on the seedling stand 3,
When the rotation case 11 rotates from the top dead center TDC in the direction of arrow A by θ ₂ =approximately 150 degrees, both seedling plants 2
By configuring the dividing claw 19 at 0 to enter the field scene B, one of the seedling plants 20 of both seedling plants 20 is separated during one rotation of the rotating case 11.
The timing when the splitting claws 19 in 0 take out the seedlings from the seedling pine on the seedling platform 3 and the timing when the splitting claws 19 in the other seedling planting body 20 plant the seedlings in the field scene B do not overlap. , are configured to be appropriately shifted from each other.

In addition, during one rotation of the rotating case 11, the rotating case 11 moves from the top dead center TDC in the direction of arrow A by θ ₁ =approximately
When rotated by 45 degrees, the split claws 19 of one of the two seedling plants 20 enter the seedling pine on the seedling platform 3, while moving from the top dead center TDC in the direction of arrow A at θ ₂ = After the rotation angle of about 150 degrees has passed, the swing lever 30 on both seedling plants 20
By configuring the structure so that the upward rotation starts, during one rotation of the rotating case 11, the dividing claws 19 of one of the two seedling plants 20 move away from the seedling pine on the seedling stand 3. The timing when taking out the seedlings and the other seedling plant 20
The timing at which the swinging lever 30 rotates upward against the spring 29 is configured to be appropriately shifted from each other without overlapping.

In this configuration, when the rotation case 11 in the seedling planting device 10 revolves in the direction of arrow A by the claw drive shaft 9, the seedling planting body is attached to the planting shaft 18 fitted on the drive shafts 14 on both sides thereof. 20 revolves around a claw drive shaft 9, and the planting shaft 18 to which the seedling plant 20 is attached is elastically connected to a planetary gear 15 via a spring body 23, and the planetary gear 15 is connected to an intermediate gear 17. The gear train mechanism is configured with the sun gear 12 via the sun gear 12, and the sun gear 12 and the planet gear 15 are configured to have the same number of teeth. As the rotation case 11 revolves in the direction of arrow A, the planting shaft 18 connected to the drive shaft 14 rotates in the direction opposite to the direction of arrow A by the same rotation angle as the rotation angle of the revolution.
Since it rotates around , both planting shafts 18
Both seedling plants 20 attached to the seedling plant 20 are to rotate in the direction of arrow A while facing the direction of the seedling platform 3 and maintaining a constant posture with respect to the seedling platform 3. During this turning movement, the seedling stand 3
When descending from top to bottom on the side facing the field, the splitting claw 19 at the tip divides only one seedling from the seedling pine on the seedling stand 3, and then it is planted in the field scene B near the lower limit of descent. , it rises from the field scene B in that direction.

In this case, when the rotating case 11 is in a substantially horizontal state, the seedling plant body 20 on the side facing the seedling platform 3
The stopper arm 25 of the planting shaft 18 is the fifth
As shown in the figure, when the cam 24 on the intermediate shaft 16 comes into contact with the arcuate outer circumferential surface 26, the rotation of the seedling plant 20 in the direction opposite to the arrow A is stopped from this point. This is because the rotation of the rotating case 11 in the direction opposite to the arrow A is delayed relative to the revolution of the rotating case 11 in the direction of the arrow A (however, the planetary gear 15 rotates in the direction opposite to the arrow A, (The seedling plant 20 separates against the spring body 23, and elastic force is stored in the spring body 23.) As the rotating case 11 revolves in the direction of the arrow A, the seedling planting body 20 moves its divided claws 19 toward the field scene B.
, it changes its posture so that it is approximately vertical and enters the field scene B.

When the stopper arm 25 comes off the arc-shaped outer peripheral surface 26 of the cam 24 as the rotation case 11 revolves in the direction of the arrow A, the seedling plant 20 is moved in the opposite direction to the arrow A by the elastic force of the spring body 23. This return rotation causes the dividing claws 19 to rotate in the opposite direction to the direction of movement of the rice transplanter 1 after planting the seedlings in the field scene B, that is, to move away from the seedlings after planting. The seedling plant 20 moves up and leaves the field scene B, and eventually returns to its original position, so the movement trajectory of the tip of the split claw 19 at this time is vertical, as shown by the two-dot chain line in FIG. It becomes an elliptical closed loop curve D elongated in the direction, for example,
A vertically elongated elliptical closed loop curve similar to that of the crank-type seedling planting device described in Japanese Patent Publication No. 49-27762 is obtained.

That is, when the two seedling plants 20 in this case descend toward the field scene B with their split claws 19 holding the seedlings, they change their posture vertically and enter the field scene B, and after planting, they move from the field scene B. When it leaves, it rises while escaping away from the planted seedlings, so it is possible to reliably plant the seedlings in field scene B in the correct posture.

Further, while the rotation case 11 is revolved in the direction of arrow A, each seedling plant 20 rotates in the direction opposite to arrow A with respect to the drive shaft 14, so that each seedling plant 20
When the swinging lever 30, which comes into contact with the cam 33 on the drive shaft 14, reaches the lower limit where the tip of the splitting claw 19 of the seedling plant 20 enters the field area B,
Since the cam 33 rotates downward based on the shape of the cam 33 due to the biasing force of the spring 29, this rotation causes the pushing tool 28 at the lower end of the guide shaft 27 to move into the eighth position.
As shown by the two-dot chain line in the figure, the splitting claw 19 moves forward toward the tip to push the seedling into the field scene B for planting.When this pushing-in planting is completed, the splitting claw 19 Almost at the same time as it comes out of surface B, the swinging lever 30 rotates upward against the spring 29 based on the shape of the cam 33, so that the pushing tool 28 moves backward from the tip of the split claw 19. It returns to its original position (the position shown by the solid line in FIG. 8).

Note that in the above embodiment, the cam 24 of the intermediate shaft 16
and the stopper arm 25 of the planting shaft 18,
By delaying the rotation of the seedling plant 20 by the planetary gear 15 with respect to the revolution of the rotating case 11,
In this case, inconstant speed rotation was transmitted to the planting shaft 18, but instead of this method, as shown in FIGS. A cam gear 24a having a surface 26a and a toothless portion 26b is fixed, and a toothless stopper gear 25a with some teeth cut out on the circumference is provided on the planting shaft 18. In other words, it may be configured to transmit inconstant speed rotation to the planting shaft 18 as the rotation case 11 rotates, and according to this embodiment, the revolution of the rotation case 11 Since the seedling plant 20 can be returned to its original state with a delay due to the meshing rotation of the cam gear 24a and the stopper gear 25a, the spring body 23 that elastically connects the planetary gear 15 and the seedling plant 20 It has the advantage of being able to be made smaller.

Moreover, the present invention is not limited to the case where two seedling plants 20 are attached to one rotary case 11, but can of course be applied to the case where three or more seedling plants are attached.

[Action/effect of the invention]

As described above, in the rotary seedling planting device, the present invention divides the seedlings into each seedling plant by the dividing claws of the seedling plant by swinging the head of the seedling plant. By providing a push-out device that operates toward the tip, it is possible to prevent the seedlings once planted against the field from being lifted up together with the splitting claws, which have a high circumferential speed, making it easier to plant seedlings. You can definitely improve your certainty.

Moreover, during the rotation of the rotating case, the split claws of one of the seedling plants take out the seedling from the seedling pine on the seedling stand, and the timing when the splitting claw of one of the seedling plants takes out the seedling from the seedling pine on the seedling stand, and By arranging the split claws on the body to suitably shift the timing when planting seedlings in the field, the split claws in one seedling planting body can be separated from each other in relation to the claw drive shaft for rotationally driving the rotating case. The locally large torque generated when taking out the seedlings from the seedling pine can be avoided from acting as a load at the same time when the seedlings are planted in the field using the split claws of the other seedling planting body. The movement speed of the split claw of another seedling plant when planting the seedling in the field with the split claw is the same as the speed of movement of the split claw of the one seedling plant when taking out the seedling from the seedling pine on the seedling stand. Because of the locally large torque, it is possible to reliably prevent fluctuations such as becoming faster or slower.

By the way, since the upward rotation of the rocking lever in each of the seedling plants, that is, the backward movement of the extrusion tool, is performed against the spring that urges the extrusion tool in the forward direction, the rotation case In addition to the torque required to take out the seedlings from the seedling pine with the splitting claws in each seedling plant, the claw drive shaft for rotationally driving the pusher has a torque that causes the pusher to move backward against its spring. The required torque,
This will act as a load.

In this case, the present invention provides timing when a split claw of one of the seedling plants takes out the seedling from the seedling pine on the seedling stand during one rotation of the rotating case; By appropriately shifting the timing when the push-out tool in the seedling plant moves backward against the spring, the one seedling plant It is possible to avoid the fact that the torque required to take out the seedlings from the seedling pine with the split claws in the seedling plant and the torque required to move the pushing tool in another seedling planting body backward against its spring act almost simultaneously. In other words, when a pushing tool is provided for each seedling plant in the rotary seedling planting device to improve the reliability of seedling planting, the seedlings are removed by the dividing claws of the one seedling plant. This is because the torque required to take out the seedlings from the pine and the torque required to move the push-out tool in another seedling plant backward against its spring can be distributed to various locations during one rotation of the claw drive shaft. , the maximum torque value and torque fluctuation for the pawl drive shaft can be significantly reduced.

Therefore, according to the present invention, although each seedling body in the rotary seedling planting device is provided with a pushing tool for improving the reliability of planting seedlings, as described above, each seedling planting body When planting seedlings using the split claws in the body, it is possible to reduce fluctuations in the movement speed of the split claws, and as described above, the torque fluctuations in the claw drive shaft and, by extension, the vibrations can be significantly reduced.
It is possible to significantly stabilize the planting posture of seedlings in relation to the field, and to achieve further improvement in durability.Moreover, as mentioned above, by reducing the maximum torque value on the claw drive shaft, Since the load on the drive shaft and the sun gear can be reduced, the claw drive shaft and the sun gear can be made smaller and lighter, which in turn makes the rotary seedling planting device even smaller and lighter.
This makes it possible to achieve weight reduction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a rice transplanter, Fig. 2 is a plan view of the rice transplanter, Fig. 3 is a cross-sectional view of the seedling transplanting device, and Fig. 4 is a side view of the rice transplanter. 5 is a cross-sectional view of FIG. 3, FIG. 6 is a diagram showing the operating state of FIG. 5, FIG. 7 is a diagram showing the movement trajectory of the seedling plant, and FIG. 3 is an enlarged cross-sectional view of FIG. 8, and FIG. 9 is a cross-sectional view of FIG.
FIG. 0 is a cross-sectional view taken from FIG. 8, FIG. 11 is a diagram showing another embodiment of the seedling planting device, and FIG. 12 is a diagram showing the operating state of FIG. 11. DESCRIPTION OF SYMBOLS 1... Rice transplanter, 9... Claw drive shaft, 10... Rotary seedling transplanting device, 11... Rotating case, 12... Sun gear, 14... Drive shaft, 15... Planetary gear, 16
... Intermediate shaft, 17 ... Intermediate gear, 18 ... Planting shaft, 19 ... Division claw, 20 ... Seedling planting body, 21,2
2...Claw, 23...Spring body, 24...Cam, 25
...Stopper arm, 24a...Cam gear, 2
5a... Stopper gear, 27... Guide shaft, 2
8... Pushing tool, 29... Spring, 30... Rocking lever, 33... Cam.

Claims (1)

[Claims] 1 A claw drive shaft that is rotatably driven by power transmission from a power source is supported on the machine body near the seedling stand in a substantially horizontal and horizontal direction, and a plurality of claws are mounted on the outer periphery of a rotating case attached to the claw drive shaft. The planting shafts of the above are respectively supported in parallel with the claw drive shafts, and seedling planting bodies equipped with split claws are each attached to each of the planting shafts in a posture facing the seedling stand, while the rotation A gear train is provided in the case to transmit inconstant rotation to each of the planting shafts as the rotating case rotates, and each seedling plant is connected to the tip of the dividing claw in the seedling plant. In a seedling planting device configured to swing and rotate so as to draw a long elliptical closed loop locus in the vertical direction, each of the seedling plants is provided with a seedling divided by a dividing claw in the seedling plant. A push-out tool is provided at the tip of the split claw, and a swinging lever that engages with the electric push-out tool is pivotally mounted at one end, and the push-out tool is attached to each seedling plant. A spring is provided that presses and biases the swinging lever in the forward direction, and the swinging lever is moved against the cam on the drive shaft fixed non-rotatably to the rotating case to push out the swinging lever as the seedling plant swings. The tool is brought into contact so as to move forward under the pressure of the spring and then move backward against the spring, and during one rotation of the rotating case, one of the seedling plants is planted. The split claws on the body suitably shift the timing when the seedlings are taken out from the seedling pine on the seedling platform and the timing when the split claws on other seedling planting bodies plant the seedlings in the field. During one rotation, the splitting claw of one of the seedling plants takes out the seedling from the seedling pine on the seedling platform, and the pushing tool of the other seedling plant resists its spring. A seedling planting device for a rice transplanter, characterized in that the timing of the backward movement and the timing of the back movement are appropriately shifted.