JPS6211377Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a seedling stand placed on the rear side in the direction of movement of the aircraft, and a seedling planting arm provided on the front side of the seedling stand that circulates up and down at a position in front of the seedling stand. This invention relates to a rice transplanter equipped with a planting claw device.

In this type of rice transplanter, the planting claw of the seedling planting claw device is fixed to the planting arm, and the trajectory of the tip of the claw is controlled by the circulation trajectory of the arm. Because the planting process is carried out at the planting site, from the time the planting claw starts plunging into the muddy soil until it reaches the lowest point on its descending path, the tip of the claw is dragged forward in the direction of movement through the muddy soil, and the planting location is Long grooves are created in the front and back, which has the disadvantage that the posture of the planted seedlings tends to be disturbed.

In order to eliminate these drawbacks, there has been a technology that has been developed in the past by devising the circulation mechanism of the planting arm so that the locus of movement of the tip of the nail in the mud becomes vertical or almost vertical. Various proposals have been made, but in this case, the planting arm has a relatively large mass, and the heavy planting arm rotates at a high speed of about 300 rpm. Since a mechanism for changing the operating locus must be incorporated, the mechanism itself for changing the locus is complicated and large-scale, and the disadvantage of increasing the overall weight of the rice transplanter, which is desired to be lightweight, cannot be avoided. Furthermore, as the planting arm, which rotates at such a high speed and has a large weight, draws an irregular trajectory,
The kinetic inertia of the planting arm also acts irregularly, and this irregular kinetic inertia is difficult to eliminate with balance weights, so it has the disadvantage of imparting irregular vibrations to the entire aircraft.

In view of these circumstances, the purpose of the present invention is to reduce the distance the claws drag in muddy soil, while ensuring smooth circulation of the planting arm, thereby suppressing disturbances in the planting posture. have

The rice transplanter according to the present invention has a characteristic configuration in which a pair of left and right seedling dividing claws is attached to the tip of the planting arm, and the seedling dividing claws are configured to be able to swing freely in the front and rear directions with respect to the planting arm. A seedling extruder is provided within the width of the seedling dividing nails in the parallel direction, and is swingable in the front and back direction together with the seedling dividing nails, and pushes out the seedlings as the seedling dividing nails swing rearward, Further, a spring is provided that urges the seedling dividing claw to swing backward, and the seedling dividing claw is held in a forward swinging posture against the biasing force of the spring, and the seedling dividing claw is lowered. The present invention is provided with a cam mechanism that releases the holding of the forward swinging posture and swings the seedling dividing claw backwards by means of a spring when the plant reaches the lowest point of the path. The structure provides the following effects.

In other words, rather than changing the circulation locus of the planting arm, by swinging the pair of left and right seedling dividing claws, which have much smaller mass, the claw trajectory at the tips of the seedling dividing claws is changed. , there is less risk of the machine body being subjected to irregular vibrations due to irregular interlocking inertia, such as when changing the circulation operation trajectory of the planting arm, and there is no need for a large-scale change mechanism to change the claw trajectory. This has the advantage of avoiding the inconvenience of increasing the weight of the rice transplanter as a whole.

And again, just before the seedling dividing claw reaches the lowest point on its descending path, that is, when it plunges into the muddy soil,
Alternatively, just before starting the swing, the trajectory of the claw tip is displaced backward, and by swinging the claw, the forward ground movement speed of the claw as the aircraft advances can be reduced, so the claw is not dragged in muddy soil. Travel distance can be shortened,
This is advantageous in that there is little risk of disturbing the posture of the planted seedlings due to the dragging of the claws.

Furthermore, a seedling pushing tool is provided within the width of the left and right seedling dividing claws in the parallel direction, and the seedling pushing tool is configured to swing in the front and back direction together with the seedling dividing claws. Not only can the scraped seedlings be pushed into the mud reliably, but also the pushing tool can be positioned in the desired position relative to the swingable seedling dividing claws to ensure the desired pushing. It is easy to operate.

Furthermore, in the present invention, in order to obtain the above-mentioned effects, a new problem arises due to the relative movement of the seedling dividing claw with respect to the planting arm. When moving the seedling dividing claw, the front and back movements of the seedling dividing claw are completely regulated by a cam mechanism or a link mechanism, or the rear side of the seedling dividing claw. It is also conceivable that the movement to the rear side is controlled by a cam mechanism, and the return to the front side is performed by a spring, but in either case, the movement of the seedling dividing claws to the rear side The movement is
The cam mechanism is used to forcibly control the posture of the seedling dividing claws, so if the speed of the rearward movement of the seedling dividing claws is faster than the forward movement speed of the machine, the mud will be forcibly pushed away. If the action is to move the seedling root part backwards, on the other hand, if it is slow, the dragging phenomenon cannot be sufficiently resolved. In the latter case, it may be difficult to determine the return position of the seedling dividing claw, or the seedling dividing claw may be swung by the resistance of the bed soil when entering the seedling bed soil on the seedling platform. However, the present invention uses a spring to move the seedling dividing claw to the rear and a cam to return it to the front. There is no such inconvenience, and when the seedling splitting claw plunges into the mud, the pressing force of the spring and the resistance of the mud are well balanced with the correlation with the speed of the aircraft, and the mud is forcibly pushed away and the roots of the seedlings are moved to the rear. It has the advantage of being able to reduce the possibility of movement and dragging of the nails.
When dividing the soil part of the seedling bed on the seedling stand, it is easy to determine the posture of the seedling dividing claw with respect to the planting arm and to divide the seedlings as expected.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 shows a walking rice transplanter. The rice transplanter has 4 paddy wheels with lugs that can swing up and down and move on the tiller.
An engine-related device 6 is mounted on the front part of the machine frame, which has a soil leveling float 5 that can freely move up and down and slides on the mud surface GL, and a seedling planting device 7 is attached to the rear of the machine frame. A control handle 8 extending rearward is connected to the attachment device 7 .

The seedling planting device 7 has a seedling platform 9 which is located in a forward downward tilted position and is movable in a horizontal direction toward the lower end of the slope and which can supply seedlings. A seedling retrieval opening 11 is formed in a fixed rail 10 that supports the stand 9 and the inclined lower end of the placed seedling so as to be slidable in the horizontal direction. A seedling planting claw device 12 is provided which operates to take out a unit amount of seedlings from a seedling take-out port 11 and plant them.

As shown in FIGS. 2 and 3, the seedling planting claw device 12 has a planting arm 1 that circulates up and down with a base point in front of the seedling take-out port 11 in the direction of travel.
As the planting arm 1 circulates, it passes through the seedling take-out port 11 in an attitude and direction that is substantially orthogonal to the placement surface of the seedling stand 9, thereby removing the unit amount of planted seedlings from the placed seedlings. It is possible to take out the seedlings of
In addition, a planting claw 2 capable of holding the cut seedlings is equipped so as to be able to swing back and forth, and this planting claw 2
The planting arm 1 is provided with a mechanism 3 for swinging the seedling, and the planting arm 1 is provided with a mechanism 3 that operates to push out the seedlings held by the planting claw 2 to the planting location when the planting claw 2 is located at the lowest point. A push-out tool 13 is attached.

The mechanism for circulating the planting arm 1 is as follows:
A rotary arm 14 is provided which pivotally supports the middle part of the planting arm 1 and rotates around a position offset from the arm pivot point in conjunction with the lateral movement of the seedling stand 9. A swing link 15 is provided to regulate the attitude of the planting arm 1 around the pivot point while the non-claw attachment side end of the planting arm 1 is pivotally supported.

The planting claw 2 includes a mounting member 2A that is attached to the planting arm 1 so as to be swingable back and forth, and a mounting member 2A that is detachable from the mounting member 2A. It is composed of a pair of seedling dividing claws 2a, 2a, which are sharp in side view and are cut out and held in a state where the part is inserted between the opposed parts.

The mechanism for swinging the claw 2 is the planting arm 1
The shaft 2B on the planting claw 2 side is rotatably supported by the
a spring 3A that acts on the spring 3A to elastically swing and urge the planting claw 2 rearward; and a shaft 17 for pivotally supporting the planting arm 1 fixed to the rotating arm 14 (this is 14 rotates around the pivot axis with respect to the planting arm 1.), and as the cam 3B rotates, the planting claw 2 resists the elastic biasing force. A cam mechanism 3 consisting of a rod 3C that can be swung forward is provided, and the cam mechanism 3 has a cam 3B shape, and the starting point is _P1 before reaching the lowest point P of the claw descending path. While the claw 2 is swung backwards with the lowest point P as the end point, a point on the ascending route near the lowest point P is the starting point, and the ascent is located at approximately the same height as the front _P1 . The claw 2 is configured to swing forward with the path point as the end point.

Therefore, of the movement trajectory a of the tip of the claw 2 relative to the aircraft, the second half of the descending trajectory _a1 and the first half of the ascending trajectory _a2 are the second half of the descending trajectory _a1 when the claw 2 is not swung, as shown in the figure. ′ and the first half of the ascending trajectory portion a ₂ ′, and the first half of the ascending trajectory portion a ₂ is located behind the second half of the descending trajectory portion a ₁ , so that the trajectory a as a whole has a figure-eight shape. Become.
Therefore, the length of movement of the tip of the claw 2 in the mud during planting is determined by the movement trajectory A of the claw 2 with respect to the mud surface GL shown in FIG. As is clear from the comparison with the movement trajectory A' for the mud surface GL in No. 2, it is extremely short.

The extrusion tool 13 is inserted between the pair of seedling dividing claws 2a, 2a of the claw 2, and is attached to the planting arm 1 so that it can freely swing up and down about a position spaced apart from the rear surface of the claw 2 as a fulcrum R. At the same time,
By providing the claw 2 with a pin 19 that fits into a long hole 18 formed along the longitudinal direction of the claw 2, the claw 2 can swing in the direction of pushing out the seedlings in conjunction with the backward swinging of the claw 2. It is configured to move toward the tip of No. 2.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention. Fig. 1 is a side view of the entire rice transplanter, Fig. 2 is an enlarged partially cutaway side view of the main part, and Fig. 3 is an enlarged part of the main part. A notch plan view, Fig. 4 is an enlarged sectional view taken along the - line in Fig. 2, Fig. 5 is a line diagram showing the locus of ground movement of the claw tip,
FIG. 6 is a diagram showing the ground movement locus of the tip of the claw in the conventional device. 1... Planting arm, 2a... Seedling dividing claw, 3...
...Cam mechanism, 3A...Spring, 13...Seedling pusher.

Claims (1)

[Scope of utility model registration request] A seedling platform 9 is arranged on the rear side in the direction of movement of the machine, and a seedling planting claw device 12 equipped with a planting arm 1 that circulates up and down at a position in front of the seedling platform 9 is arranged in front of the seedling platform 9. In a rice transplanter, a pair of left and right seedling dividing claws 2a, 2a is attached to the tip of the planting arm 1, and the seedling dividing claws 2a, 2a are configured to be swingable in the front and rear directions with respect to the planting arm 1. Also, the seedling dividing claws 2a, 2a are swingable in the front and back direction together with the left and right seedling dividing claws 2a, 2a within the width in the parallel direction of the left and right seedling dividing claws 2a, 2a.
A seedling pushing tool 13 is provided to push out the seedlings as the seedling splitting claws 2a, 2a are swung backward.
A spring 3A is provided to urge the seedling dividing claws to swing rearward, and the seedling dividing claws 2a, 2a are held in a forward swinging posture against the biasing force of the spring 3A, and the seedling dividing claws 2a, 2a are When reaching the lowest point of the descending path, the cam mechanism 3 is released to release the forward swinging posture and act to swing the seedling dividing claws 2a, 2a backward by the spring 3A. A rice transplanter characterized by the following: