JPH0528565B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a rice transplanter that uses a rotary type for dividing seedlings one by one from a seedling pine on a seedling stand and then planting the seedlings on a field. The present invention relates to a seedling planting device.

[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 being configured to move, the seedlings are not damaged when dividing the seedlings from the seedling pine, and after the seedlings are planted in the field, the dividing claws quickly escape from the seedlings and stabilize the planting posture of the seedlings. It was hot.

However, this crank-type seedling planting device has problems such as large vibration due to its vertical swing and slow planting speed.

Therefore, in order to reduce vibrations and improve the planting speed, a so-called rotary seedling planting device, which has a seedling planting case with split claws attached to the outer periphery of a rotating case, has been developed, for example, in the Japanese Patent Publication No. 49-17806. This method has been proposed in Japanese Patent Publication No. 49-17807, etc.

[Problem to be solved by the invention]

However, this rotary seedling planting device requires a mechanism to swing and rotate the seedling case so that the tip of the dividing claw draws a long elliptical closed loop trajectory in the vertical direction. , This oscillation is controlled by the planting shaft to which the seedling planting case with split claws is attached,
It is configured to perform this by a crank mechanism provided between the rotation transmission mechanism and the planting shaft. However, if the mechanism for swinging and rotating the seedling case is a crank mechanism, the torque fluctuations are large, making the planting posture of the seedlings relative to the field unstable, and it is difficult to sufficiently reduce vibration. Moreover, there was a problem of low durability.

In addition, in this rotary seedling planting device, because the circumferential speed at the tip of the split claw is fast, the seedlings that were once planted in the field are lifted up together with the split claw when the split claw leaves the field. There was also the problem that the reliability of planting seedlings was lower than that of the above-mentioned crank type seedling planting device.

An object of the present invention is to solve the above-mentioned conventional problems in a rotary seedling planting device without complicating the structure or increasing the size.

[Means to solve the problem]

In order to achieve this object, the present invention includes a rotating case that is rotatably driven by power transmission from a power source on the machine body near the seedling stand so as to rotate around a substantially horizontal axis, At a plurality of locations on a circumference centered on the axis of the rotating case,
Planting shafts parallel to the axis are rotatably supported, and a seedling planting case equipped with split claws is attached to each of the planting shafts with the split claws facing toward the seedling platform. In the seedling planting device, a gear train mechanism configured to transmit inconstant rotation to each of the planting shafts as the rotary case rotates is installed in the rotating case, and the last gear of each gear in the gear train mechanism gears are provided so as to fit onto each of the planting shafts, and each of the seedling planting cases is swung so that the tip of the dividing claw in the seedling planting case draws a long elliptical closed loop locus in the vertical direction. A pushing tool configured to rotate and configured to push out the split seedlings by the splitting claw in the direction of the tip end thereof is provided on the splitting claw in each of the seedling planting cases;
Each of the planting shafts is formed into a hollow shaft, into which a drive shaft fixed non-rotatably to the rotary case is inserted, and the seedling is inserted into the insertion portion of the drive shaft into the seedling planting case. A cam is provided to operate the extrusion tool in accordance with the swinging movement of the plant case.

〔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 the machine body 5 via swing cases 8, and the machine body 5 of the rice transplanter 1 has a rice transplanter mounted in front of the seedling stand 3, which is rotated by power from the engine 2. A driven claw shaft 9 is pivotally supported substantially horizontally, 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 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 shaft 9 that is pivotally supported on the machine body 5. The rotating case 11 is rotated in the right direction by the claw shaft 9 as shown by an arrow A when the rice transplanter 1 is viewed from the side. The sun gear 12 is rotatably fitted onto the body 5, and the sun gear 12 is non-rotatably locked to the body 5 via a suitable rotational phase adjusting means 13.

A drive shaft 14 for a pushing tool (described later) is supported parallel to the claw shaft 9 on the outer periphery of the rotary case 11, that is, on both left and right ends, at positions equidistant from the claw shaft 9. Both drive shafts 14 are fixed to the rotating case 11 in a non-rotatable manner, and the sun gear 12 is mounted on both drive shafts 14.
A planetary gear 15 having the same number of teeth is rotatably fitted. Further, inside the rotating case 11, a claw shaft 9 is provided.
An intermediate shaft 16 is pivotally supported at an intermediate position between the drive shafts 14 and the sun gear 12 and the planetary gears 15. Each gear 12, 17, 15
and a cam gear 24 and a toothless stopper gear 25, which will be described later, to transmit inconstant rotation to the planting shafts 18 fitted on each of the drive shafts 14 as the rotating case 11 rotates. constitutes a train mechanism (in this case, the planetary gear 51 is the sun gear 12
(It may be made to mesh directly with the

On the other hand, a hollow planting shaft 18 is rotatably fitted onto both drive shafts 14 in the rotating case 11, and one end of the planting shaft 18 and the driving shaft 14 are projected outside the rotating case 11. The protruding ends of both planting shafts 18 have seedling dividing claws 19 at their tips.
A hollow seedling planting case 20 equipped with the above is fixed in a position where its divided claws 19 face the seedling mounting table 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 of the seedling planting cases 20 is provided with a hollow guide shaft 27 that extends parallel to the dividing claws 19 and is movable up and down, and a pushing tool 28 is provided at the lower end of the hollow guide shaft 27. A spring 29 is provided inside each of the guide shafts 29 to press and bias the guide shaft 27 downward. A lever-type operating body 30 is disposed inside each of the seedling planting cases 20, one end of which is rotatably pivoted with a pin 31, and the other end 32
is rotatably but non-slidably engaged with the upper end of the guide shaft 27, so that the pushing tool 28 moves up and down as the operating body 30 moves up and down; is inserted into the seedling planting case 20, and the drive shaft 14 inside the seedling planting case 20 has a
The cam 33 is fixed, the middle part of the actuating body 30 is brought into contact with the outer peripheral surface of the cam 33, and the cam 33 is fixed.
The outer circumferential surface of the actuating body 30 is configured to rotate downward only when each of the seedling planting cases 20 approaches its lower limit.

Furthermore, both intermediate shafts 16 in the rotating case 11
A cam gear 24 (large diameter) having an arcuate outer circumferential surface 24a and a toothless portion 24b is fitted to each of the cam gears 24 (large diameter) on a part of the circumference, while a circular A toothless type stopper gear 25 (small diameter) in which some of the teeth on the periphery are notched is fitted, and the seedling planting case 20 is rotated in the direction of the arrow A of the rotating case 11, so that the seedling mounting table 3
on the side facing the seedling platform 3, from a height position corresponding to the lower end of the seedling stand 3 (in other words, a position where the rotating case 11 is approximately horizontal) to a position slightly before the lower limit (in other words, the dividing claw 19 is placed in the field scene B). The arc-shaped outer peripheral surface 24 of the cam gear 24 of the intermediate shaft 16 only in the section where it descends to a predetermined depth
a is the toothless stopper gear 25 of the planting shaft 18
By abutting on the toothless portion in , the counterclockwise rotation of the planting shaft 18 is delayed only in the above section.

In this configuration, when the rotating case 11 in the seedling planting device 10 revolves in the direction of arrow A by the claw shaft 9, the seedling planting case 20 attached to the planting shaft 18 fitted on the drive shaft 14 at both ends of the The planting shaft 18, which revolves around the shaft 9 and to which the seedling planting case 20 is attached, is elastically connected to the planetary gear 15 via a spring body 23, and the planetary gear 15 is connected to the intermediate gear 1.
7 meshes with the sun gear 12, and the sun gear 1
A gear train mechanism is configured between the sun gear 12 and the planetary gear 15, and the sun gear 12 and the planetary gear 15 are configured as the same gear, and the planetary gear 15 and the planting shaft 1 connected thereto.
8 rotates around the drive shaft 14 in a direction opposite to the direction of arrow A by the same rotation angle as the rotation angle of the rotation case 11 in the direction of arrow A. The planting case 20 rotates in the direction of arrow A while facing the direction of the seedling platform 3, and during this rotating movement, when it descends from top to bottom on the side facing the seedling platform 3, After dividing only one seedling from the seedling pine on the seedling stand 3 with the dividing claw 19 at the tip, the tip of the dividing claw 19 enters into the field scene B near the lower limit, and then the field scene B. It will rise even more.

In this case, when the rotating case 11 is in a substantially horizontal state, the seedling planting case 20 on the side facing the seedling table 3 has an arcuate outer peripheral portion 24a of the cam gear 24 of the intermediate shaft 16 as shown in FIG. So, planting axis 1
One end of the toothed part of the toothless stopper gear 25 of No. 8 comes into contact, and from this point on, the rotation of the seedling planting case 20 in the direction opposite to the arrow A is stopped. (However, the planetary gear 15 rotates in the opposite direction to arrow A and resists the claws 21 and 22 and the spring body 23. (The spring body 23 stores elastic force), and as the rotating case 11 revolves in the direction of the arrow A, the dividing claws 19 of the seedling planting case 20 become approximately perpendicular to the field scene B. The posture is changed as shown in the field scene B.
to invade.

As the rotating case 11 revolves in the direction of arrow A, the teeth of the large diameter cam gear 24 on the intermediate shaft 16 and the teeth of the small diameter toothless stopper gear 25 on the planting shaft 18 are Spring body 23
By engaging with the spring force of the planting shaft 18
However, since it rotates at a faster speed than the intermediate shaft 16 based on the diameter ratio of the large diameter cam gear 24 and the small diameter toothless stopper gear 25, the seedling planting case 20 attached to the planting shaft 18 rotates at a faster speed than the intermediate shaft 16. is rotated back around the drive shaft 14 in the direction opposite to arrow A, and this return rotation causes the dividing claws 19 to rotate in the direction opposite to the direction of movement of the rice transplanter 1 after planting the seedlings in the field area B. The seedling plant 20 moves away from the planted seedlings and rises out of the field scene B, and eventually returns to its original position. As shown by the dotted chain line, the closed loop curve D is an ellipse of the hand in the vertical direction, and for example, the closed loop curve has the same shape as that of the crank type seedling planting device described in the above-mentioned Japanese Patent Publication No. 49-27762. You will get it.

In other words, when the two seedling planting cases 20 in this case descend toward the field scene B with their divided claws 19 holding the seedlings, they change their posture vertically and enter the field scene B, and after planting, the seedlings are removed 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.

Also, while the rotating case 11 is rotating in the direction of arrow A, each seedling planting case 20 rotates in the opposite direction to arrow A with respect to the planting shaft 14, so that each seedling planting case 20 is placed on the planting shaft 14. The lever 33 in contact with the cam 33 rotates in a downward direction based on the shape of the cam 33 when the seedling planting case 20 reaches the lower limit where the tip of the dividing claw 19 enters into the field scene B. From this rotation, guide shaft 2
7. The pushing tool 28 at the lower end descends toward the tip of the split claw 19 as shown by the two-dot chain line in FIG. 8, and plants the seedling by pushing it into the field area B. When this is completed, the pushing tool 28 returns to its original position (the position indicated by the solid line in FIG. 8) from the tip of the dividing claw 19 at approximately the same time as the dividing claw 19 is removed from the field scene B.

Note that the present invention is of course applicable not only to the case where two seedling planting cases 20 are attached to one rotary case 11 but also to the case where three or more seedling planting cases are attached.

[Action/effect of the invention]

As described above, the present invention provides a gear train mechanism in which an inconstant velocity axis is transmitted to each planting shaft in a rotating case as the rotating case rotates. By configuring the seedling planting case with split claws so as to fit on the planting shaft, the tips of the split claws in the seedling planting case draw a long elliptical closed loop locus in the vertical direction. Since it is a device that swings and rotates, the seedling planting case is swung and rotated, compared to the conventional rotary seedling transplanting device that swings and rotates the seedling case via a crank mechanism. In this case, the torque fluctuation is small, and the planting posture of the seedlings can be stabilized with respect to the field, vibration can be significantly reduced, and durability can be improved.

Moreover, by providing the splitting claws of the seedling planting case with a pushing tool that is activated by the swinging rotation of the seedling planting case, once the seedlings are planted in the field, they can be moved together with the splitting claws that have a faster circumferential speed. Since the seeds can be prevented from being lifted up, the reliability of planting seedlings in the field can be greatly improved.

Furthermore, in order to improve the reliability of seedling planting using the pushing tool as described above, the planting shaft to which the seedling planting case is attached is formed into a hollow shaft, and a shaft for operating the pushing tool is provided inside the shaft. By inserting the drive shaft, the structure can be simplified and an increase in size can be avoided, compared to the case where the planting shaft of the seedling planting case and the drive shaft of the pushing tool are provided at different positions.

[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. FIG. 3 is an enlarged cross-sectional view taken from the side of FIG. 3, and FIG. 9 is a cross-sectional view taken from the side of FIG. DESCRIPTION OF SYMBOLS 1... Rice transplanter, 9... Claw 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 case, 2
1, 22... Pawl, 23... Spring body, 24... Cam gear, 25... Missing tooth type stopper gear, 27...
Guide shaft, 28... extrusion tool, 29... spring,
30... Working body, 33... Cam.

Claims (1)

[Claims] 1. A rotating case that is rotationally driven by power transmission from a power source is arranged on the machine body near the seedling stand so as to rotate around a substantially horizontal axis; Planting shafts parallel to the axis are rotatably supported at a plurality of locations on the circumference of the plant, and each planting shaft is equipped with a seedling planting case equipped with split claws, and the split claws are attached to the seedling stand. In the seedling planting device that is mounted in a direction facing the side, a gear train mechanism is installed in the rotating case and transmits inconstant rotation to each of the planting shafts as the rotating case rotates. The last gear of each gear in the gear train mechanism is provided so as to fit onto each of the planting shafts, and each of the seedling planting cases has an elliptical shape in which the tips of the dividing claws in the seedling planting case are long in the vertical direction. The device is configured to swing and rotate so as to draw a closed loop locus, and the dividing claw in each of the seedling planting cases is provided with a pushing tool configured to push out the divided seedlings by the dividing claw in the direction of the tip thereof; Each planting shaft is formed into a hollow shaft, into which a drive shaft fixed non-rotatably to the rotation case is inserted, and the seedling planting shaft is inserted into the insertion portion of the drive shaft into the seedling planting case. 1. A seedling planting device for a rice transplanter, characterized in that a cam is provided to operate the pushing tool as the case swings.