JPH03143314A - Forced seedling transplantation apparatus of transplantation machine - Google Patents

Abstract

PURPOSE:To stabilize the transplantation posture of a seedling and to improve the durability of the apparatus by properly staggering the timing to deliver a seedling with a dividing claw of a seedling transplantation member from the timing to retreat the pushing tool of another seedling transplantation member against the force of a spring. CONSTITUTION:When a rotary case 11 is rotated about theta1=45 deg. from the top dead center T.D.C in the direction of the arrow A during one revolution of the case, a dividing claw 19 of one of the seedling transplantation members 20 is thrust into a seedling mat on a seedling table 3. The upward rotation of a swinging lever of both seedling transplantation members 20 is started to retreat the pushing tool against the force of a spring when the rotation of the rotary case exceeds about theta2=150 deg. from the top dead center T.D.C in the direction of the arrow A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a forced seedling planting device equipped with a pusher for pushing seedlings separated from a seedling mat on a seedling platform into soil.

[Problems to be solved by conventional techniques and inventions] Generally,
As is well known, this type of forced seedling planting device is equipped with a pushing tool that moves up and down along split claws attached to the seedling planting body, and the pushing tool in this forced seedling planting device is operated by spring force. , configured to push downward. In this case, in the conventional forced seedling planting device, as described in, for example, Japanese Utility Model Publication No. 49-35853, the spring for pushing out the extrusion tool downward is moved up and down to move the guide shaft to which the extrusion tool is attached. A lever is provided for the purpose of

However, in this case, a space must be provided in the seedling plant to which the split claw is attached to accommodate the spring, making the seedling plant larger and heavier. Since part of the force acts as a strain on the guide shaft, there is a drawback that the extrusion tool does not move smoothly.

The present invention aims to solve this problem.

[Means to solve the problem]

In order to achieve this object, the present invention provides a forced seedling planting device equipped with a pushing tool that moves up and down along dividing claws attached to a seedling planting body, in which a guide shaft for the pushing tool is formed hollow, and the inside thereof is Further, a spring is provided to press and bias the extrusion tool in a downward direction.

〔Example〕

Below, we will explain the drawings of the embodiments of the present invention applied to a rotary-type seedling planting device in a walk-behind two-row rice transplanter. A float 6 that slides on the field scene B is provided on the underside of a machine body 5 that also serves as a transmission case and is equipped with a seedling stand 3 and a handle 4, and wheels 7 are attached to both left and right sides of the machine body 5 via swing cases 8. The machine body 5 of the rice transplanter 1 has a claw shaft 9 that is rotatably driven by the power from the engine 2 and is pivoted in a substantially horizontal direction at a position in front of the seedling platform 3. 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-type seedling planting device IO is equipped with an oval-shaped rotating case 11 that is fitted and fixed to the end of a claw shaft 9 that is a pivot support on a machine body 5. The case 11 rotates clockwise in the direction of arrow A when viewed from the side of the rice transplanter 1 by the claw shaft 9. A sun gear 12 is rotatably fitted onto the claw shaft 9 in the rotating case 11, and The gear 12 is non-rotatably locked to the body 5 by a suitable rotational phase adjusting means 13.

At both left and right ends of the rotating case 11, planetary gear shafts I4 are supported parallel to the claw shaft 9 at equal distances from the claw shaft 9, and both planetary gear shafts 14 rotate with respect to the rotating case 11. A planetary gear 15 having the same number of teeth as the sun gear 12 is rotatably fitted onto both planetary gear shafts 14. Further, in the rotating case ll, an intermediate shaft 16 is provided at an intermediate position between the pawl shaft 9 and both planetary gear shafts 14.
is pivotally supported, and an intermediate gear 17 that meshes with both the sun gear 12 and the planetary gears 15 is fitted onto the intermediate shaft 16 to constitute a planetary gear mechanism (in this case, the planetary gears 15 are the sun gears). 12).

On the other hand, both planetary gear shafts 14 in the rotating case 11
A sleeve-shaped shaft 18 is rotatably fitted onto the top, one end of the sleeve-shaped shaft 18 and the planetary gear shaft 14 protrude outside the case 11, and the protruding end of the sleeve-shaped shaft 18 has a Hollow seedling plant body 20 equipped with a seedling dividing claw 19 at the tip
are fixed in position with their divided claws 19 facing toward the seedling platform 3.

The planetary gears 15 of both planetary gear shafts 14 have pawls 21 that protrude toward the sleeve-shaped shaft 18 , and the sleeve-shaped shaft 18 has pawls 22 that protrude toward the planetary gears 15 .
are provided in one direction, and both claws 21 and 22 are connected to the planetary gear 1.
When the planetary gears 15 rotate clockwise, they contact each other, and when the planetary gears 15 rotate counterclockwise, they separate from each other, and both claws 2
A ring-shaped spring body 23 is provided between the claws 21 and 22, and this ring-shaped spring body 23 prevents the left rotation of the planetary gear 15 from rotating around the sleeve-shaped shaft. 18.

On the other hand, each seedling plant 20 is provided with a hollow guide shaft 27 that extends parallel to the dividing claw I9 and is movable up and down.
A pushing tool 28 is provided at the lower end of the hollow guide shaft 27, and a spring 29 is provided inside to press the guide shaft 27 downward.
are provided for each. Further, a naginata-shaped lever 30 is disposed inside each seedling plant 20, one end of which is rotatably pivoted to a bin 31, and the other end 32 is engaged with the upper end of the lever 30, By moving the lever 30 up and down, the pushing tool 2
8 is configured to move up and down, and further, the planetary gear shaft 1
4 is inserted into the seedling plant 20, a cam 33 is fixed to the planetary gear shaft 14 in the seedling plant 20, and the middle part of the lever 30 is brought into contact with the outer peripheral surface of the cam 33. The outer peripheral surface of the cam 33 is shaped so that the lever 30 rotates downward only when each of the seedling plants 20 approaches the lower limit. In this case, the other end 32 of the lever 30 is engaged between two collars 34.35 fixed to the upper end of the guide shaft 27, and both collars 34.3
5 is slidably fitted into a cylinder pore 36 concentric with the axis of the guide shaft 27 in the seedling plant 20, and a portion of the seedling plant 20 of the bearing 37 relative to the guide shaft 27. A cushion body 38 made of rubber is provided.

Note that a fan-shaped cam 24 is fixed to each of the intermediate shafts 16 in the rotating case 11, and stopper arms 25 are fixed to both sleeve-shaped shafts 8 in the rotating case 11.
are provided in one direction, and the seedling plant 20 is placed in the rotating case 1.
As the case 1 rotates in the direction of arrow A, the side facing the seedling stand 3 descends from a height position corresponding to the lower end of the seedling stand 3 (that is, a position where the rotating case 1 is approximately horizontal). The stopper arm 25 on the sleeve-shaped shaft 18 is moved only in the section where it descends to a position slightly before the lower limit (that is, the position where the dividing claw 19 has penetrated into the field scene B to a predetermined depth).
However, the arcuate outer peripheral surface 26 of the cam 24 on the intermediate shaft 16
By abutting against the sleeve, the counterclockwise rotation of the sleeve-shaped shaft 18 is delayed only in the above-mentioned section.

In this configuration, the rotating case 1 in the seedling planting device 10
1 revolves around the claw shaft 9 in the direction of arrow A, the seedling plant 20 attached to the sleeve-shaped shaft 18 fitted on the planetary gear shaft 14 at both ends revolves around the claw shaft 9. The sleeve-shaped shaft 18 to which the seedling plant 20 is attached is elastically connected to the planetary gear 15 via a spring body 23, and the planetary gear 15 meshes with the sun gear 12 via an intermediate gear 17 to form a sun gear. A planetary gear mechanism is constructed between the sun gear 12 and the planetary gear 15, and the number of teeth is the same between the sun gear 12 and the planetary gear 15. , as the rotating case 11 revolves in the direction of the arrow A, it rotates about the planetary gear shaft 14 in the direction of the arrow C, which is opposite to the direction of the arrow A, by the same rotation angle as the rotation angle of the revolution. The seedling plant body 20 turns in the direction of arrow A while facing the direction of the seedling stand 3, and during this turning movement, when it descends from top to bottom on the side facing the seedling stand 3. After dividing only one seedling from the seedling mat on the seedling platform 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 It rises from B.

During the revolution of the rotating case 11 in the direction of arrow A, each seedling plant 20 rotates in the direction of arrow C with respect to the planetary gear shaft 14, so that each seedling plant 20 rotates on the planetary gear shaft 14. The lever 33 that comes into contact with the cam 33 of the seedling plant 2
0 reaches the lower limit at which the tip of the split claw 19 enters into the field scene B, the spring 2 is activated based on the shape of the cam 33.
9, the push-out tool 28 at the lower end of the guide shaft 27 descends toward the tip of the dividing claw 19, as shown by the two-dot chain line in FIG. , the seedlings are planted by pushing them into the field scene B, and when this pushing-in planting is finished, the pushing tool 28 is pushed against the spring 29 from the tip of the split claw 19 almost at the same time as the split claw 19 comes out of the field scene B. Then, it returns to its original position (the position shown by the solid line in FIG. 8).

In addition, if the sleeve-shaped shaft 18 is provided with the stopper arm 25 and the intermediate shaft 17 is provided with the cam 24 as in the above embodiment, when the rotating case 11 is in a substantially horizontal state, it will face the seedling platform 3. In the side seedling plant 20, its sleeve-shaped shaft 18
As shown in FIG. 5, the stopper arm 25 contacts the arcuate outer peripheral surface 26 of the cam 24 on the intermediate shaft 16, and from this point on, the rotation of the seedling plant 20 in the direction of arrow C is stopped. Therefore, the rotation of the seedling plant 20 in the direction of arrow C is
This is because the revolution of the rotating case 11 in the direction of the arrow A is delayed (however, the planetary gear 5 rotates in the direction of the arrow C, and the pawl 2
1 and 22 are separated against the spring body 23, and elastic force is stored in the spring body 23), and the seedling plant body 20 is moved away from the rotating case 11.
As the rotating case 11 revolves in the direction of the arrow A, its attitude is changed so that the dividing claw 19 is approximately perpendicular to the field scene B, enters the field scene B, and then moves in the direction of the arrow A of the rotating case 11. When the stopper arm 25 comes off the arc-shaped outer circumferential surface 26 of the cam 24 due to the revolution of the seedling plant 20, the spring body 2
3, the splitting claw 19 is rotated back around the planetary gear shaft 14 in the direction of the arrow C, and by this returning rotation, the dividing claw 19 is
Later, the seedlings are planted in the field scene B in the opposite direction to the direction of movement of the rice transplanter 1. In other words, the seedlings are planted in the opposite direction to the advancing direction of the rice transplanter 1; Since it returns to its original position, the motion locus of the tip of the split nail tool 9 at this time becomes a vertically elongated closed loop curve as shown by the two-dot chain line in FIG. A closed loop curve having the same shape as in the case of the rocking seedling planting device will be obtained.

In this case, the cam 24 of the intermediate shaft 16 and the sleeve-like shaft 18
and the stopper arm 25 of the planetary gear 1 of the seedling plant 20.
Instead of delaying the rotation by 5 with respect to the revolution of the rotating case 11, as shown in FIGS. A cam gear 24a having a toothless portion 26b is fixed, and a toothless stopper gear 25a with some teeth cut out on the circumference is provided on the sleeve-shaped shaft 18, thereby achieving the same effect as described above. It is also possible to do this.

Moreover, the present invention is of course applicable not only to the rotary type seedling planting device but also to a vertically swinging type seedling planting device.

[Action/effect of the invention]

As described above, the present invention provides a forced seedling planting device equipped with a pushing tool that moves up and down along dividing claws attached to a seedling planting body, in which a guide shaft for the pushing tool is formed hollow, and the The gist is that a spring is provided that presses and biases the extrusion tool in a downward direction.In this way, the guide shaft for the extrusion tool is formed hollow, and the extrusion tool is pressed in the downward direction within the guide shaft. By providing a spring that biases the extrusion tool in a downward direction, there is no need to provide a separate space for providing a spring that presses and biases the extrusion tool downward in the seedling plant, and the seedling plant can be made smaller and lighter. This has the effect that the pushing tool can push out the seedlings very smoothly without the force exerting a strain on the guide shaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and 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 an IV of FIG. 3. -IV sectional view, Figure 5 is the 3rd
Figure 6 is a diagram showing the operating state of Figure 5, Figure 7 is a diagram showing the movement locus of the seedling plant, and Figure 8 is a diagram showing the movement trajectory of the seedling plant.
Figure 9 is an enlarged cross-sectional view taken along ■-■ in Figure 8, Figure 10 is a cross-sectional view taken along line X-X in Figure 8, and Figure 11 is another cross-sectional view of the seedling planting device. FIG. 12 is a diagram showing an example of the embodiment, and FIG. 12 is a diagram showing the operating state of FIG. 9...Claw axis, IO...Seedling planting device, 19...
Split claw, 20... seedling planting body, 27... guide shaft,
28...Extrusion tool, 29...Spring, 30...
Lever 33...Cam.

Claims (1)

[Claims] (1) In a forced seedling planting device equipped with a push-out tool that moves up and down along dividing claws attached to a seedling planting body, a guide shaft for the push-out tool is formed hollow, and the push-out tool is placed inside the guide shaft for the push-out tool. A forced seedling planting device for a rice transplanter, characterized by being provided with a spring that presses downward.