JPH06292425A - Seedling planting apparatus for rice transplanter - Google Patents

Abstract

PURPOSE:To move the tip end of a divided tine of each seedling planting case along an orbit having vertically extended elliptic closed loop with a simple mechanism. CONSTITUTION:A rotary case 11 rotated by the power transmitted from a power source is attached to a machine body near a seedling holding table in a state rotating around a nearly horizontal lateral axis. Planting shafts 18 parallel to the above axis are rotatably supported at plural positions on the circle having the above axis as the center. A seedling planting case 20 provided with a divided tine 19 is attached to each planting shaft in a state to direct the divided tine toward the seedling holding table. The seedling planting case is rotated under swinging with a gear train to give an ununiform rotational motion to each planting shaft according to the rotation of the rotary case 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type seedling planting device for planting a seedling in a field after splitting the seedlings one by one from a seedling mat on a seedling mount in a rice transplanter. .

[0002]

2. Description of the Related Art Conventionally, a seedling planting apparatus of this type has a base end of a seedling plant having a split claw for seedling on the tip side of the machine body as described in Japanese Patent Publication No. 49-27662. While connecting through an agitating link, 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 divided by the rotation of the crank. By constructing the tip of the nail to swing up and down so as to draw a locus of an elliptical closed loop that is long in the vertical direction, the seedlings are not damaged when splitting from the seedling mat, and the seedlings are split after planting in a field scene. The nails quickly escaped from the seedlings to stabilize 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 type seedling planting device in which a seedling planting case with a split claw is attached to the outer peripheral portion of the rotating case is disclosed in, for example, Japanese Patent Publication No. Sho 49-17806. Japanese Patent Publication No. 49-17807 and the like.

[0004]

However, in this rotary seedling planting device, the seedling planting case is pivoted so that the tip of the split claw draws a locus of an elliptical closed loop that is long in the vertical direction. A mechanism is required, and conventionally, this swinging rotation is performed by a crank mechanism provided between a planting shaft to which a seedling planting case with a split claw is attached and a rotation transmission mechanism for the planting shaft. I am configuring. However, if the mechanism for swinging and rotating the seedling planting case is a crank mechanism, the torque fluctuation is large, so that the posture of planting the seedlings in the field scene is unstable and the vibration is sufficiently reduced. However, there is a problem that the durability is low.

SUMMARY OF THE INVENTION The present invention has a technical problem to solve the above-mentioned conventional problems in a rotary type seedling planting device without causing the structure to become complicated and large in size.

[0006]

In order to achieve this technical object, the present invention provides a "rotating case, which is rotatably driven by power transmission from a power source, to a machine near a seedling stand in a substantially horizontal direction. Is arranged so as to rotate around the axis line, and at a plurality of locations on the circumference centered on the axis line in the rotating case, planting shafts parallel to the axis line are rotatably supported, and each of the planting A seedling planting case with a split claw on the shaft,
In a seedling planting device in which the split claws are mounted in a posture toward the seedling mounting table side, in the rotating case, non-constant rotation is transmitted to each of the planting shafts as the rotating case rotates. By providing a gear train made to,
The tip of the split claw in the seedling planting case is pivotally rotated so as to draw a locus of an elliptical closed loop that is long in the vertical direction. "It was to be.

[0007]

Embodiments of the present invention will be described below with reference to the drawings in which the embodiment of the present invention is applied to a walking 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 mounted via a claw shaft 9 that is rotatably driven by the power from the engine 2 in a horizontal position in front of the seedling table 3 in the body 5 of the rice transplanter 1. Supported by
A rotary type 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 10 is an oval type rotating case 11 fitted and fixed to the end of a pawl shaft 9 which is 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, and the sun is provided on the pawl shaft 9 in the rotating case 11. A gear 12 is rotatably fitted, and the sun gear 12 is non-rotatably locked to the machine body 5 via an appropriate rotation phase adjusting means 13.

At the outer peripheral portion of the rotating case 11, that is, at the left and right ends, at the same distance from the pawl shaft 9,
A drive shaft 14 for an extruding tool (which will be described later) is axially supported in parallel with the pawl shaft 9, and both drive shafts 14 are non-rotatably fixed to the rotating case 11 and on the both drive shafts 14. A planetary gear 15 having the same number of teeth as the sun gear 12 is rotatably fitted therein. An intermediate shaft 16 is pivotally supported in the rotary case 11 at an intermediate position between the pawl shaft 9 and both drive shafts 14, and both the sun gear 12 and the planetary gear 15 are supported on the intermediate shafts 16. By fitting the meshing intermediate gear 17, the respective gears 12, 17 and 15 and the cam gear 24a and the tooth-chipped stopper gear 25a, which will be described later, cause the drive shaft 14 to rotate as the rotary case 11 rotates. A gear train is configured to transmit the non-uniform rotation to the planting shaft 18 fitted in (in this case, the planetary gear 15 may be directly meshed with the sun gear 12).

On the other hand, a hollow shaft planting shaft 18 is rotatably fitted on both drive shafts 14 in the rotating case 11 so that one end of the planting shaft 18 and the drive shaft 14 are connected to each other.
A hollow seedling planting case 20 having projecting claws 19 for seedlings is provided at the projecting ends of both the planting shafts 18 so as to project toward the outside of the rotating case 11. Position and fix each.

The planet gears 15 on both drive shafts 14 are provided with claws 21 projecting toward the planting shaft 18.
The planting shaft 18 is integrally provided with pawls 22 projecting toward the planetary gear 15, and the pawls 21 and 22 are brought into contact with each other when the planetary gear 15 rotates to the right.
Are configured to separate from each other when they rotate counterclockwise,
A ring-shaped spring body 23 is provided between the pawls 21 and 22 to urge the pawls 21 and 22 in a direction in which the pawls 21 and 22 come into contact with each other, and the ring-shaped spring body 23 is used to plant the left rotation of the planetary gear 15. It is configured to elastically transmit to the shaft 18.

On the other hand, each of the seedling planting cases 20 is provided with a hollow guide shaft 27 extending in parallel with the split claws 19 so that the hollow guide shaft 27 can move up and down.
The push-out tool 28 is provided therein with springs 29 for biasing the guide shaft 27 downward. Also,
A lever-type actuating body 30 is arranged in each of the seedling planting cases 20, and one end of the actuating body 30 is rotatably pivoted by a pin 31, while the other end 32 is pivoted on the upper end of the guide shaft 27. It is configured so that it can be freely slidably engaged and the push-out tool 28 can be moved up and down by the vertical rotation of the actuating body 30, and the drive shaft 14 is inserted into the seedling planting case 20. A cam 33 is fixed to the drive shaft 14 in the seedling planting case 20,
The middle part of the actuating body 30 is brought into contact with the outer peripheral surface of the cam 33, and the outer peripheral surface of the cam 33 is connected to the seedling planting cases 2
The operating body 30 is configured to rotate downward only when 0 is near the lower limit of the lowering.

Further, cam gears 24a (large diameter) each having an arcuate outer peripheral surface 26a and a toothless portion 26b are fitted to both of the intermediate shafts 16 in the rotating case 11 at a part of the circumference, while A toothless stopper gear 25a (small diameter) in which a part of the teeth on the circumference is cut off is fitted to each of the planting shafts 18 in the rotary case 11, and the seedling planting case 20 is indicated by an arrow of the rotary case 11. On the side facing the seedling placing table 3 with the rotation in the A direction, from the height position corresponding to the lower end of the seedling placing table 3 (that is, the position where the rotating case 11 is substantially horizontal), just before the lower limit of descent. Of the intermediate shaft 16 (i.e., the position where the split claw 19 enters the field scene B to a predetermined depth).
The circular arc-shaped outer peripheral surface 26a in FIG. 1 is brought into contact with the toothless portion of the toothless stopper gear 25a of the planting shaft 18 so that the leftward rotation of the planting shaft 18 is delayed in the above section.

In this structure, when the rotating case 11 of the seedling planting device 10 revolves in the direction of arrow A by the pawl shaft 9, the planting shaft 1 fitted on the drive shafts 14 at both ends thereof.
The seedling planting case 20 attached to 8 revolves around the pawl shaft 9, but the planting shaft 18 to which the seedling planting case 20 attaches is elastically connected to the planetary gear 15 via the spring body 23 to form a planetary gear. The gear 15 meshes with the sun gear 12 via an intermediate gear 17,
In addition, the sun gear 12 and the planetary gear 15 have the same number of teeth, and the planetary gear 15 and the planting shaft 1 connected to the planetary gear 15 are provided.
8 rotates around the drive shaft 14 in the direction opposite to the arrow A direction by the same rotation angle as the rotation angle of the revolution along with the revolution of the rotating case 11 in the direction of arrow A. The planting case 20 turns in the direction of arrow A while facing the seedling placing table 3, and during this turning movement, when descending from the top to the bottom on the side facing the seedling placing table 3, After splitting only one seedling from the seedling mat on the seedling mounting table 3 by the split claw 19 at the tip, the tip of the split claw 19 penetrates into the field B in the vicinity of the lower limit of descending, and thereafter the field B It will rise more.

In this case, when the rotating case 11 is in a substantially horizontal state, in the seedling planting case 20 on the side facing the seedling placing table 3, the fifth portion is formed on the arc-shaped outer peripheral portion 26a of the cam gear 24a of the intermediate shaft 16. As shown in the figure, one end of the tooth portion of the toothless stopper gear 25a of the planting shaft 18 abuts,
From this point, the rotation of the seedling planting case 20 in the direction opposite to the arrow A stops, so that the rotation of the seedling planting case 20 in the direction opposite to the arrow A causes the rotation of the rotating case 11 in the direction of the arrow A. Since it is delayed (however, the planetary gear 15 rotates in the direction opposite to the arrow A, separates from the pawls 21 and 22 against the spring body 23, and elastic force is stored in the spring body 23), the seedling planting case 20 With the revolution of the rotating case 11 in the direction of the arrow A, the posture of the split claw 19 is changed so as to be substantially vertical with respect to the field scene B, and enters the field scene B.

As the rotating case 11 revolves in the direction of arrow A, the tooth portion of the large-diameter cam gear 24a on the intermediate shaft 16 is replaced by the tooth portion of the small-diameter toothless stopper gear 25a on the planting shaft 18. , The planting shaft 18 rotates at a faster speed than the intermediate shaft 16 based on the diameter ratio between the large-diameter cam gear 24a and the small-diameter toothless stopper gear 25a. Axis 18
The seedling planting case 20 attached to the drive shaft 1 is mounted in the direction opposite to the arrow A.
4, the split claw 19 is rotated in the opposite direction to the traveling direction of the rice transplanter 1 after planting the seedlings in the field B, that is, while moving away from the seedlings after planting. It escapes from B and rises, and eventually seedling plant 2
0 returns to the original posture, and the movement locus of the tip of the split claw 19 at this time becomes an elliptical closed-loop curve D which is long in the vertical direction, as shown by the chain double-dashed line in FIG. 7.
A closed loop curve having the same shape as that of the crank type seedling planting apparatus described in Japanese Patent Publication No. 49-27762 is obtained.

That is, both seedling planting cases 20 here
When the divided claw 19 with the seedling descends toward the field scene B, the posture is vertically changed to enter the field scene B,
When leaving the field scene B after planting, it rises while escaping away from the seedling after planting, so that it is possible to reliably plant the seedlings in the field scene B under the correct posture.

While the rotating case 11 revolves in the direction of arrow A, each seedling planting case 20 rotates about the planting shaft 14 in the direction opposite to the arrow A, so that each seedling planting case 2 is rotated.
The lever 33 that contacts the cam 33 on the planting shaft 14 at 0 is based on the shape of the cam 33 when the seedling planting case 20 reaches the lower limit of lowering where the tip of the split claw 19 enters the field B. Since it rotates downwards, the pushing tool 28 at the lower end of the guide shaft 27 descends toward the tip of the split claw 19 as shown by the chain double-dashed line in FIG. Planting is carried out by pushing it into the field scene B, and when this pushing and planting is finished, the push-out tool 28 moves the splitting claw 1 almost at the same time when the split claw 19 comes out of the field scene B.
It returns to the original position (the position shown by the solid line in FIG. 8) retracted from the tip of 9.

It is needless to say that the present invention is not limited to the case in which the two seedling planting cases 20 are mounted on the single rotating case 11, but can be applied to the case where three or more seedling planting cases are mounted.

[0020]

As described above, according to the present invention, the gear train is provided in the rotating case so as to transmit the non-constant speed rotation to each planting shaft according to the rotation of the rotating case,
Since the seedling planting case with split claws is pivoted so that the tip of the split claws in the seedling planting case draws a locus of an elliptical closed loop that is long in the up-down direction, the conventional rotary seedling planting device As described above, the torque fluctuation when swinging the seedling planting case is smaller than that of swinging the seedling planting case through the crank mechanism, and the seedling planting posture is stabilized in the field scene. In addition to the effects, it is possible to significantly reduce vibration and improve durability.

[Brief description of drawings]

FIG. 1 is a side view of a rice transplanter.

FIG. 2 is a plan view of a rice transplanter.

FIG. 3 is a cross-sectional view of a seedling planting device.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

5 is a cross-sectional view taken along line VV of FIG.

FIG. 6 is a diagram showing the operating state of FIG. 5;

FIG. 7 is a diagram showing a movement trajectory of a seedling plant.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 1 Rice transplanter 3 Seedling table 9 Claw shaft 10 Rotary type seedling plant 11 Rotating case 12 Sun gear 14 Drive shaft 15 Planetary gear 16 Intermediate shaft 17 Intermediate gear 18 Planting shaft 19 Dividing claw 20 Seedling case 21, 22 Claw 23 Spring Body 24a Cam gear 25a 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 centered on the axis, a planting shaft parallel to the axis is rotatably supported, and each planting shaft has a seedling planting case with a split claw, the split claw being In a seedling planting device that is mounted in a posture toward the seedling table side, a gear train that transmits non-constant rotation to each of the planting shafts in the rotating case as the rotating case rotates. In the rice transplanter, the seedling planting case is constructed so that the tip of the dividing claw in the seedling planting case is pivoted so as to draw a locus of an elliptical closed loop that is long in the vertical direction. Seedling planting equipment.