JP2635928B2 - Seedling plant in rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary seedling plant for dividing rice plants one by one from a seedling mat on a seedling mounting table in a rice transplanter and then planting the seedlings in a field. .

[0002]

2. Description of the Related Art Conventionally, this kind of seedling planting apparatus has, as described in, for example, Japanese Patent Publication No. 49-27762, attaches the base end of a seedling plant having a divided claw of a seedling to a tip thereof on an airframe side. While being connected via an agitation link, the middle of the seedling is pivotally connected to the tip of a crank fixed to a claw shaft that is driven to rotate by an engine, and the rotation of the crank separates the seedling. By constructing the tip of the nail to swing up and down so as to draw a long elliptical closed-loop trajectory in the vertical direction, the seedling is not damaged when the seedling is split from the seedling mat, and the seedling is split after planting in the field scene The nails quickly escaped from the seedlings to stabilize the planting posture of the seedlings.

[0003] However, this crank type seedling planting apparatus has problems such as large vibrations due to its vertical swing and a low planting speed. Therefore, in order to reduce the vibration and improve the planting speed, a so-called rotary seedling plant in which a seedling case with split claws is attached to the outer periphery of the rotary case is disclosed in, for example, Japanese Patent Publication No. Sho 49-17806. And Japanese Patent Publication No. 49-17807.

[0004]

However, in this rotary seedling plant, the seedling case is swung 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 the seedling case with split claws is attached and a rotation transmitting mechanism for the planting shaft. Make up. However, if the mechanism for swinging and swinging the seedling case is a crank mechanism, the torque variation is large, so the planting posture of the seedling with respect to the field scene is unstable, and the vibration is sufficiently reduced. However, there is a problem that the durability is low.

[0005] It is a technical object of the present invention to solve the above-mentioned conventional problems in a rotary seedling-planting apparatus without causing a complicated structure and an increase in size.

[0006]

In order to achieve this technical object, the present invention relates to a method of manufacturing a vehicle in which a rotating case driven by power transmission from a power source is mounted on a body near a seedling mounting table in a substantially horizontal orientation. Are arranged so as to rotate about the axis of the rotation case, and planting shafts parallel to the axis are rotatably supported at a plurality of positions on a circumference around the axis in the rotating case, and each of the plantings is A seedling case with split claws on the axis,
In the seedling plant, wherein the split claws are mounted in a posture toward the seedling mounting table side, the rotation is provided between a sun gear which is non-rotatably disposed at a center position in the rotating case and each of the planting shafts. A gear train that transmits unequal speed rotation to each planting shaft with the rotation of the case, a gear train is provided in the rotating case, and the seedling planting case is divided into the claw in the seedling planting case. Is pivoted so that its tip draws a locus of an elliptical closed loop that is long in the vertical direction. "It was to be.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings in which the embodiments are applied to a walking type two-row rice transplanter.
In the drawing, reference numeral 1 designates a transmission case body 5 having an engine 2 at the front and a seedling mounting table 3 and a handle 4 at the rear.
A float 6 is provided on the lower surface of the vehicle for sliding in a field scene B.
And a claw shaft 9 that is rotationally driven by the power from the engine 2 is provided on the body 5 of the rice transplanter 1 at a position in front of the seedling mounting table 3 in a substantially horizontal direction. Supported,
At both left and right ends of the claw shaft 9, a rotary seedling planting device 10, which will be described in detail later, is mounted.

As shown in FIGS. 3 to 5, the rotary seedling plant 10 is an oval-shaped rotating case 11 fitted and fixed to an end of a claw shaft 9 which is pivotally supported on the machine body 5. The rotating case 11 is rotated rightward by the claw shaft 9 as shown by an arrow A in a side view of the rice transplanter 1. A gear 12 is rotatably fitted, and the sun gear 12 is non-rotatably locked to the machine body 5 via a suitable rotation phase adjusting means 13.

At the outer peripheral portion of the rotating case 11, that is, at both left and right end portions, a position where the distance from the claw shaft 9 is equal,
A drive shaft 14 for an extruder (to be described later) is supported in parallel with the claw shaft 9, and both drive shafts 14 are fixed non-rotatably to the rotating case 11, and are mounted on the drive shafts 14. The planetary gear 15 having the same number of teeth as the sun gear 12 is rotatably fitted. In the rotating case 11, an intermediate shaft 16 is supported at an intermediate position between the claw shaft 9 and the two drive shafts 14. On both the intermediate shafts 16, both the sun gear 12 and the planetary gear 15 are provided. By fitting the meshing intermediate gear 17, the intermediate gear 17 meshing with the sun gear 12, the planetary gear 15 meshing with the intermediate gear 17, a cam gear 24 a and a missing tooth stopper gear 25 a, which will be described later, A gear train is configured to transmit unequal-speed rotation to the planting shaft 18 fitted on each drive shaft 14 with the rotation of the rotating case 11 (in this case, the planetary gear 15 is directly connected to the sun gear 12). It may be made to mesh with each other).

On the other hand, a planting shaft 18 of a hollow shaft is rotatably fitted on both the driving shafts 14 in the rotating case 11, and one end of the planting shaft 18 and the driving shaft 14 are
At the protruding ends of the planting shafts 18, a hollow seedling case 20 having splitting claws 19 for seedlings is provided at the projecting ends, and the split claws 19 face the seedling mounting table 3. Position and fix each.

The planetary gears 15 on the two drive shafts 14 have pawls 21 projecting toward the planting shafts 18.
A claw 22 protruding toward the planetary gear 15 is integrally provided on the planting shaft 18, and the claws 21 and 22 are brought into contact with each other when the planetary gear 15 rotates clockwise, so that the planetary gear 15
Are configured to separate from each other when they rotate to the left,
A ring-shaped spring body 23 is provided between the claws 21 and 22 to urge the claws 21 and 22 in a direction in which the claws 21 and 22 come into contact with each other, and the left-handed rotation of the planetary gear 15 is planted by the ring-shaped spring body 23. It is configured to transmit elastically to the shaft 18.

On the other hand, each seedling case 20 is provided with a hollow guide shaft 27 extending in parallel with the dividing claws 19 so as to be movable up and down.
The pusher 28 is provided with a spring 29 therein for urging the guide shaft 27 downward. Also,
A lever-type operating body 30 is arranged in each seedling case 20, and one end of the operating body 30 is pivotally connected to a pin 31 so as to be freely rotatable, while the other end 32 is pivoted to the upper end of the guide shaft 27. The pusher 28 is freely and non-slidably engaged so that the pusher 28 moves up and down by the vertical rotation of the operating body 30. Further, the drive shaft 14 is inserted into the seedling plant case 20, A cam 33 is fixed to the drive shaft 14 in the seedling case 20,
An intermediate portion of the operating 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 attached to each of the seedling cases 2.
The operating body 30 is configured to rotate downward only when 0 comes close to its lower limit.

Further, a cam gear 24a (large diameter) having an arc-shaped outer peripheral surface 26a and a toothless portion 26b in a part of the circumference is fitted to both intermediate shafts 16 in the rotating case 11, respectively. A toothless stopper gear 25a (small diameter) in which some teeth on the circumference are cut out is fitted to both the planting shafts 18 in the rotating case 11, respectively. On the side facing the seedling mounting table 3 with the rotation in the direction A, slightly lower than the lower limit of the lowering from the height position corresponding to the lower end of the seedling mounting table 3 (that is, the position where the rotating case 11 becomes substantially horizontal). (That is, the position where the split claw 19 has entered the field scene B to a predetermined depth) in the section of the cam gear 24 a of the intermediate shaft 16.
By contacting the arc-shaped outer peripheral surface 26a with the missing tooth portion of the toothless stopper gear 25a of the planting shaft 18, the left rotation of the planting shaft 18 is delayed in the section.

In this construction, when the rotating case 11 of the seedling plant 10 revolves around the claw shaft 9 in the direction of arrow A, the planting shaft 1 fitted to the drive shafts 14 at both ends thereof.
8, the seedling case 20 revolves around the claw shaft 9, and the planting shaft 18 to which the seedling case 20 is attached is elastically connected to the planetary gear 15 via a spring 23, and The gear 15 meshes with the sun gear 12 via the intermediate gear 17,
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 thereto are connected.
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 rotation case 11 in accordance with the revolving rotation of the rotating case 11 in the arrow A direction. The planting case 20 makes a turning movement in the direction of arrow A in a state facing the seedling mounting table 3. During this turning movement, when the planting case 20 descends from the top on the side facing the seedling mounting table 3, After splitting one seedling from the seedling mat on the seedling mounting table 3 with the splitting nail 19 at the tip, the tip of the splitting nail 19 enters the field scene B near the lower lower limit, and then the field scene B It rises more.

In this case, when the rotating case 11 is in a substantially horizontal state, in the seedling case 20 on the side facing the seedling mounting table 3, the fifth outer peripheral portion 26 a of the cam gear 24 a of the intermediate shaft 16 has the fifth circular shape. As shown in the drawing, one end of the tooth portion of the toothless stopper gear 25a of the planting shaft 18 contacts,
From this point, the rotation of the seedling case 20 in the direction opposite to the arrow A is stopped, so that the rotation of the seedling case 20 in the direction opposite to the arrow A is caused by the rotation of the rotating case 11 in the direction of the arrow A. Because of the delay (the planetary gear 15 rotates in the direction opposite to the arrow A, the pawls 21 and 22 are separated from each other against the spring body 23, and the spring body 23 stores elastic force). As the rotating case 11 revolves in the direction of arrow A, the posture of the divided claws 19 is changed so that the divided claws 19 become substantially perpendicular to the field scene B, and the divided claws 19 enter the field scene B.

As the rotary case 11 revolves in the direction of arrow A, the teeth of the large-diameter cam gear 24a on the intermediate shaft 16 become the teeth of the small-diameter toothless stopper gear 25a on the planting shaft 18. , The planting shaft 18 rotates at a higher 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 case 20 to be mounted on the drive shaft 1
After the seedlings are planted in the field scene B, the split claws 19 move in the opposite direction to the traveling direction of the rice transplanter 1, that is, move away from the seedlings after planting. Goes out of B, rises, and seedlings 2
0 returns to the original posture. At this time, the motion trajectory of the tip of the split claw 19 becomes an elliptical closed loop curve D that is elongated in the vertical direction as shown by a two-dot chain line in FIG.
A closed loop curve having the same shape as that of the crank type seedling plant described in JP-B-49-27762 can be obtained.

That is, the two seedling plant cases 20 here
When the split claw 19 descends toward the field scene B while holding the seedling, the posture is changed vertically and enters the field scene B,
When the child leaves the field scene B after planting, it rises while escaping away from the seedling after planting, so that the planting of the seedling in the field scene B can be reliably performed under the correct posture.

Also, during the rotation of the rotating case 11 in the direction of arrow A, each seedling case 20 rotates in the direction opposite to the arrow A with respect to the planting shaft 14 so that each seedling case 2
At 0, the lever 33 which comes into contact with the cam 33 on the planting shaft 14 is based on the shape of the cam 33 when the seedling case 20 comes to the lowermost lower limit where the tip of the divided claw 19 enters the field scene B. As a result, the pusher 28 at the lower end of the guide shaft 27 descends toward the tip of the split claw 19 as shown by a two-dot chain line in FIG. The planting is performed by pushing in the field scene B, and when the pushing and planting is completed, the push-out tool 28 is disengaged from the dividing claw 1 substantially at the same time when the split claw 19 comes out of the field scene B.
9 returns to its original position (position indicated by the solid line in FIG. 8).

It should be noted that the present invention is not limited to the case where two seedling cases 20 are mounted on one rotating case 11, but can be applied to a case where three or more seedling cases are mounted.

[0020]

According to the present invention, as described above, the rotation case rotates between the sun gear and each of the planting shafts which are non-rotatably disposed at the center position in the rotation case. A gear train adapted to transmit unequal speed rotation to each planting shaft is provided in the rotating case, and the seedling plant with split claws is moved to an elliptical shape in which the tips of the split claws in the seedling plant are vertically long. Since the head is swung to draw a closed loop locus, the seedling case is swung and swung via a crank mechanism as in the conventional rotary seedling apparatus. The torque fluctuation when swinging the planting case is small, stabilizing the planting posture of the seedling with respect to the field scene can be achieved, vibration can be greatly reduced, and durability can be improved. .

[Brief description of the drawings]

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.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a diagram showing an operation state of FIG. 5;

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

FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG. 3;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rice transplanter 3 Seedling stand 9 Claw shaft 10 Rotary seedling plant 11 Rotating case 12 Sun gear 14 Drive shaft 15 Planetary gear 16 Intermediate shaft 17 Intermediate gear 18 Planting shaft 19 Split claw 20 Seedling case 21,22 Claw 23 Spring Body 24a cam gear 25a toothless stopper gear

Claims (1)

(57) [Claims] A rotating case, which is rotatably driven by power transmission from a power source, is disposed on an airframe near a seedling mounting table so as to rotate about a substantially horizontal horizontal axis. At a plurality of locations on the circumference around the axis, a planting axis parallel to the axis is rotatably supported, and a seedling planting case with a dividing claw is provided on each of the planting axes. In a seedling mounting device mounted in a posture toward the seedling mounting side, a sun tooth non-rotatably disposed at a center position in the rotating case.
A gear train for transmitting unequal speed rotation to each of the planting shafts with the rotation of the rotating case is provided between the car and each of the planting shafts in the rotating case. A seedling planting apparatus for a rice transplanter, characterized in that the case is configured so that the tip of the split claw in the seedling plant case swings and swings so as to draw a vertically long elliptical closed loop trajectory.