JPH0757126B2 - Seedling planting device in rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rice transplanter, which is a rotary type for dividing a seedling from a seedling mat on a seedling mounting table into individual plants and then planting this in a field scene. The present invention relates to a seedling planting device.

[Conventional technology]

Conventionally, this type of seedling planting device, for example, as described in Japanese Patent Publication No. 49-27762, the base end of the seedling plant having a split seedling claw at the tip, via the fan link to the machine side. While connecting, the middle part of the seedling plant is pivotally attached to the tip of a crank fixed to a claw shaft that is rotationally driven by an engine, and the seedling plant is rotated by the crank so that the tip of the split claw is By oscillating vertically so as to draw a locus of a long elliptical closed loop in the up-down direction, the seedlings are not damaged when splitting seedlings from the seedling mat, and the split claws quickly plant from the seedlings after planting the seedlings in the field. It escaped and stabilized the planting posture of the seedlings.

However, this crank type seedling planting device has problems that it vibrates greatly due to its vertical swing and the planting speed is slow.

Therefore, in order to reduce the vibration and improve the planting speed, a so-called rotary seedling planting device in which a plurality of seedling plants with split claws are attached to the outer peripheral portion of the rotating case is a conventional technique. It is proposed by Japanese Utility Model Publication No. 56-21212.

[Problems to be Solved by the Invention]

However, this rotary seedling planting device requires a mechanism for pivoting the seedling plant so that the tip of the split claw draws a locus of an elliptical closed loop that is long in the vertical direction. In the technology, this swinging rotation is performed between a non-rotating sun gear arranged in the center of the rotating case and a planetary gear rotatably fitted on the planting shaft to which the seedling plant is attached. ,
An intermediate shaft that meshes with both of them is provided, and the planetary gear is rotated once by one rotation of the rotating case, while the rotation of the planetary gear is transmitted to the planting shaft through a torsion spring. A pawl cam that transmits and is fixed on the planting shaft is engaged with a stopper provided on the rotating case so that it cannot rotate, and this stopper is engaged with a cam integrated with the sun gear. The reciprocating motion is performed so as to engage and disengage with the pawl cam during one rotation of the rotating case.

However, since the structure for swinging and rotating the seedling plant is extremely complicated due to the above-mentioned configuration, avoid increasing the size and weight of the rotary seedling planting device. There was a problem that I could not do it.

In addition, Japanese Patent Publication No. Sho 49-17806 as another prior art proposes that the swinging rotation of the seedling plant is performed by a relatively simple mechanism called a crank mechanism.
According to this prior art, although the swinging rotation of the seedling plant is performed relatively violently, the planting shaft to which the seedling plant is attached is mounted on the rotating case with respect to the rotating case. Since it is configured to pivotally support at the penetrating portion, it is easy for rattling to occur in the bearing portion,
There was a problem that the durability was low.

The present invention aims to solve these problems in a rotary type seedling planting device.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides: “A rotating case that is rotationally driven by power transmission from a power source is arranged in a machine near a seedling stand so as to rotate about a horizontal axis. A seedling plant provided with a split claw on each of the planting shafts, the planting shafts parallel to the axis being rotatably supported at a plurality of positions on the circumference of the rotating case about the axis. In the seedling planting device, which is mounted in a posture toward the seedling mounting table side, in the rotating case, a non-rotating sun gear is arranged at the center, and an intermediate gear corresponding to each of the planting shafts. While the respective intermediate gears are provided so as to mesh with the sun gear, the respective planting shafts are hollow shafts, and the planting shafts of the hollow shafts are attached to the support shaft fixed to the rotating case. The shaft is supported both by the supporting shaft and the rotating case It is rotatably fitted so as to be pivotally supported, and further, in the rotating case, there is provided an inconstant speed rotation transmitting means for rotating the planting shaft in an inconstant speed only by the rotation of the intermediate gear. The non-uniform speed rotation transmitting means swings and rotates each seedling plant so that the tips of the split claws in the seedling plant draw a locus of an elliptical closed loop that is long in the vertical direction. ” .

〔Example〕

Hereinafter, the embodiment of the present invention will be described with reference to the drawings of the embodiment when applied to a walk-type Nijo Ueda transplanter.

In the figure, reference numeral 1 is a machine body 5 that also serves as a transmission case and has an engine 2 in the front part and a seedling stand 3 and a handle 4 in the rear part.
A float 6 that slides in a field scene B is provided on the lower surface of the vehicle, and wheels 7 are provided on both left and right sides of the machine body 5 in a swing case 8.
1 shows a rice transplanter that is mounted via a claw shaft 9 that is rotationally driven by power from the engine 2 in a front position of the seedling mounting table 3 in the body 5 of the rice transplanter 1. A rotary type seedling planting device 10, which will be described later in detail, is attached to the left and right ends of the claw shaft 9.

As shown in FIG. 3 to FIG. 5, this rotary type seedling planting device 10 is provided with an oval type rotating case 11 fitted and fixed to an end of a pawl shaft 9 axially supported on the machine body 5, The rotating case 11 rotates in the right direction by the pawl shaft 9 as shown by an arrow A in a side view of the rice transplanter 1.
A sun gear 12 is rotatably fitted to the claw shaft 9 and the rotating case 11 on the claw shaft 9 inside, and the sun gear 12 is an appropriate rotation phase adjusting means for the machine body 5. 13
It is locked non-rotatably via.

Support shafts 14 are axially supported in parallel with the pawl shaft 9 at the same distance from the pawl shaft 9 at both left and right ends of the rotary case 11, and both support shafts 14 cannot rotate with respect to the rotary case 11. A planetary gear 15 having the same number of teeth as that of the sun gear 12 is rotatably fitted onto the both support shafts 14 while being fixedly attached thereto. In addition, an intermediate shaft 16 is supported in the rotating case 11 at an intermediate position between the pawl shaft 9 and both supporting shafts 14, and both the sun gear 12 and the planetary gear 15 are provided on the intermediate shafts 16. By fitting the meshing intermediate gear 17, the planetary gear 15 and a cam gear 24 and a toothless stopper gear 25 described later rotate the support shafts 14 with the rotation of the rotating case 11. With respect to the hollow planting shaft 18 freely fitted, the intermediate shaft 17
The non-uniform speed rotation transmitting means is configured to transmit the non-uniform speed rotation only from the.

On the other hand, on both support shafts 14 in the rotating case 11,
A hollow planting shaft 18 is rotatably fitted, and one end of the hollow planting shaft 18 is axially supported by the rotating case 11 and protrudes out of the rotating case 11 to the protruding end. Inserts a seedling plant 20 with a seedling dividing claw 19 at the tip,
However, they are fixed to the seedling placing table 3 in the posture position.

Then, the planetary gears 15 of both the support shafts 14 are integrally provided with the claws 21 projecting toward the planting shaft 18, and the planting shafts 18 are integrally provided with the claws 22 projecting toward the planetary gear 15. The claws 21 and 22 are configured to contact each other when the planetary gear 15 rotates to the right and separate from each other when the planetary gear 15 rotates to the left, and the claws 21 and 22 are arranged between the claws 21 and 22. By providing a ring-shaped spring body 23 for urging 22 in the direction of abutting each other,
The ring-shaped spring body 23 is configured to elastically transmit the left rotation of the planetary gear 15 to the planting shaft 18, and both intermediate shafts 16 in the rotating case 11 have a part of the circumference. A cam gear 24 (large diameter) having an arcuate outer peripheral surface 24a and a toothless portion 24b is fitted in each of them, while both planting shafts 18 in the rotating case 11 are notched with some teeth in the circumference. Fix the toothless stopper gears 25 (small diameter) to the seedlings.
20 is a height position corresponding to the lower end of the seedling placing table 3 on the side facing the seedling placing table 3 as the rotating case 11 rotates in the direction of arrow A (that is, the rotating case 11 becomes substantially horizontal). Position), just before the lower limit of descent (that is, the split claw 19
Only in the section where the camshaft 24 of the intermediate shaft 16 has a circular arc-shaped outer peripheral surface 24a, the toothless stopper gear 2 of the planting shaft 18 is removed.
By making contact with the toothless portion in 5, the left rotation of the planting shaft 18 is delayed only in the above section.

In this configuration, the rotating case 11 in the seedling planting device 10
, When it revolves in the direction of arrow A by the pawl shaft 9,
The seedling plant 20 attached to the planting shafts 18 fitted on the support shafts 14 at both ends thereof revolves around the claw shaft 9, but the planting shafts 18 to which the planting plant 20 is mounted are spring-loaded to the planetary gears 15. Elastically coupled via the body 23, the planetary gear 15 is connected to the sun gear via the intermediate gear 17.
The sun gear 12 and the planetary gear 15 are configured to have the same number of teeth, and the planetary gear 15 and the planting shaft 18 connected to the sun gear 12 and the planetary gear 15 are revolving in the direction of the arrow A of the rotating case 11. Along with the rotation angle of the revolution, it rotates about the planetary gear shaft 14 in the direction opposite to the arrow A direction by the same rotation angle, so that the two seedling plants 20 attached to the two planting shafts 18 are While facing the direction of the placing table 3, and while keeping a constant posture with respect to the seedling placing table 3, the turning movement is made in the direction of arrow A. During this turning movement, the seedling placing stage is moved. When descending from the top to the bottom on the side facing the table 3, only one seedling was split from the seedling mat on the seedling mounting table 3 by the split claw 19 at the tip, and then in the field scene B near the lower limit of the descending. After planting, it rises from the farm scene B after that.

In this case, when the rotating case 11 is in a substantially horizontal state, the cam gear of the intermediate shaft 16 is provided in the seedling plant 20 on the side facing the seedling mounting table 3.
On the arcuate outer peripheral surface 24a of 24, as shown in FIG.
One end of the tooth portion of the toothless type stopper gear 25 of the planting shaft 18 abuts, and from this point, the rotation of the seedling plant 20 in the direction opposite to the arrow A is stopped, whereby the arrow A of the seedling plant 20 is stopped. The rotation in the opposite direction is delayed with respect 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, and the pawls 21 and 22 become the spring body 23). The elastic force is stored in the spring body 23), and the split claw 19 of the seedling plant 20 is substantially perpendicular to the field scene B as the rotating case 11 revolves in the direction of arrow A. The posture is changed so as to become a shape and enters the farm scene B.

Then, 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 are attached to the teeth of the planting shaft.
The tooth portion of the small diameter toothless stopper gear 25 on 14 is
By engaging with the spring force of the spring body 23, the planting shaft 14 is faster than the intermediate shaft 16 based on the diameter ratio between the large-diameter cam gear 24 and the small-diameter toothless stopper gear 25. Since it rotates at speed, the seedling plant attached to this planting shaft 14
02 is rotated back about the planetary gear shaft 14 in the direction opposite to the arrow A, and by this return rotation, the split claw 19 is in a direction opposite to the traveling direction of the rice transplanter 1 after planting seedlings in the field B. While moving away from the seedlings after planting, they rise out of the field scene B, and eventually the seedling plant 20 returns to its original posture. The movement trajectory of the tip of the split claw 19 at this time is shown in FIG. As shown by the dotted chain line, an elliptical closed-loop curve D that is long in the up-down direction becomes a closed-loop curve having the same shape as that of the crank type seedling planting device described in, for example, Japanese Patent Publication No. 49-27762. Will be obtained.

In other words, both seedling plants 20 here vertically invert the posture when the divided claws 19 descend with the seedlings toward the farm scene B and invade the farm scene B, and from the farm scene B after planting. Since it rises while escaping away from the seedlings after planting, it is possible to reliably plant the seedlings in the field B under the correct posture.

In addition, according to the present invention, one rotating case 11 includes two seedlings 20.
Of course, the present invention can be applied not only to the case where three or more seedlings are attached, but also the planetary gear and the planting shaft are connected by a connecting means such as rubber or another elastic body. Is also good.

[Operation and effect of invention]

According to the present invention, as described above, the non-constant speed rotation transmitting means for rotating the planting shaft at the non-constant speed rotation only by the rotation of the intermediate gear is provided in the rotating case. , Each of the seedlings is configured to be pivoted so that the tips of the split claws in the seedlings draw a locus of an elliptical closed loop that is long in the vertical direction. Thereby, since the seedling plant can be swung and rotated by a mechanism much simpler than that of the above-mentioned prior art, the entire rotary seedling plant is
The size and weight can be greatly reduced.

Moreover, as described above, the planting shaft to which the seedling plant which swings and swings is attached is configured as a hollow shaft, and the planting shaft of this hollow shaft is supported by the supporting shaft fixed to the rotating case. By rotatably fitting so as to be rotatably supported by both the shaft and the rotating case, the planting shaft can be attached to the rotating case at a position where the planting shaft penetrates the rotating case as in the conventional case. Compared to the supporting one, the supporting shaft and the rotating case can support the bearing extremely firmly.

Therefore, according to the present invention, each seedling plant in the rotating case can be pivoted and rotated by a simple mechanism, but the bearing portion for the planting shaft to which each seedling plant is attached is loose. It is unlikely to occur, and has the effect of significantly improving the durability in that portion.

[Brief description of drawings]

Drawing shows an embodiment of the present invention, Fig. 1 is a side view of a rice transplanter, Fig. 2 is a plan view of the rice transplanter, Fig. 3 is a sectional view of a seedling plant, and Fig. 4 is a sectional view of Fig. 3. IV-IV sectional view, FIG.
Fig. 6 is a sectional view taken along line V-V in Fig. 6, Fig. 6 is a diagram showing an operating state of Fig. 5, and Fig. 7 is a diagram showing a movement trajectory of a seedling plant. 1 ... rice transplanter, 9 ... claw shaft, 10 ... seedling planting device, 11 ... rotating case, 12 ... sun gear, 14 ... support shaft, 15 ... planetary gear, 16 ... intermediate shaft, 17 ...... Intermediate gears, 18 …… Planting shafts, 19 …… Splitting claws, 20 …… Sprouting plants, 21,22 …… Claws, 23…
… Spring body, 24 …… Cam gear, 25 …… Partial tooth type stopper gear.

Claims (1)

[Claims] 1. A rotating case, which is rotationally driven by power transmission from a power source, is arranged on a machine body near a seedling mounting table so as to rotate about an axis of a substantially horizontal lateral direction. At a plurality of locations on the circumference centering on the axis, a planting shaft parallel to the axis is rotatably supported, and each planting shaft is provided with a seedling plant having a split claw. In a seedling planting device mounted in a posture facing toward the side, in the rotating case, a non-rotating sun gear is arranged at the center, and intermediate gears corresponding to each of the planting shafts are provided as intermediate gears. Is provided so as to be meshed with the sun gear, and each of the planting shafts is a hollow shaft, and the planting shafts of the hollow shafts are rotated by a supporting shaft fixed to the rotating case. Freely rotatable so as to be supported by both the case and It be fitted, further wherein in the rotating case, by providing a non-uniform speed rotation transmitting means adapted to rotate non-uniform the planting shaft only by rotation of the intermediate gear,
With this non-uniform speed rotation transmitting means, each of the seedlings is configured to be pivotally rotated so that the tips of the split claws in the seedlings draw a locus of an elliptical closed loop that is long in the vertical direction. A seedling planting device for rice planting machines.