JPS6211378Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a seedling stand arranged at the rear side in the direction of movement of the aircraft, and a planting arm provided at 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 seedling 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, conventional technology has been developed in which the circulation mechanism of the planting arm is devised so that the trajectory of the claw tip in the mud becomes vertical or almost vertical. Various methods have also been proposed, but when based on this, the planting arm has a relatively large mass, and moreover, the planting arm with the large mass is rotating at a high speed of about 300 r/p/m. Since it is necessary to incorporate a mechanism to change the circulating operation trajectory, the mechanism itself to change the trajectory is complicated and large-scale, and it also has the disadvantage of increasing the overall weight of the rice transplanter, which is desired to be lightweight. This is unavoidable, and furthermore, as the planting arm, which rotates at such high speed and has a large weight, draws an irregular trajectory, the kinetic inertia of the planting arm also acts irregularly.
The irregular motion inertia was difficult to eliminate with balance weights, etc., so it had the disadvantage of imparting irregular vibrations to the entire aircraft.

In view of the above circumstances, the present invention is designed to move the seedling dividing claws relative to the planting arm in order to shorten the dragging distance of the claws in muddy soil while ensuring smooth circulation of the planting arm. The aim is to provide a rice transplanter that suppresses disturbances in the planting posture by moving the seedling splitting claws, and at the same time solves new problems caused by moving the seedling dividing claws. be.

The characteristic configuration of the rice transplanter according to the present invention is that a seedling stand is arranged on the rear side in the direction of movement of the machine, and a planting arm is provided on the front side of the seedling stand that circulates up and down at a position in front of the seedling stand. In a rice transplanter equipped with a seedling planting claw device, 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 swingable in the front and rear directions with respect to the planting arm. At the same time, a spring is provided that urges the seedling dividing claw to swing backward, and furthermore, the seedling dividing claw is held in a forward swinging posture against the biasing force of this spring, and the seedling dividing claw is prevented from descending. A cam mechanism is provided which acts to release the forward swinging posture and swing the seedling splitting 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 motion 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.

Furthermore, before the seedling dividing claw reaches the lowest point of its descending path, that is, when it plunges into the mud, or just before it enters the mud, the claw tip trajectory is started to be displaced backward, and the swinging of this claw is This reduces the forward ground movement speed of the claw as the aircraft advances.
It is advantageous in that the distance traveled by the claws in muddy soil can be shortened, and there is little risk of disturbing the posture of the planted seedlings due to the dragging of the claws.

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. A device in which the front and back movements of the seedling dividing claw are completely regulated by a cam mechanism or a link mechanism, etc., or
It is also conceivable to have the seedling splitting claw move rearward with a cam mechanism with its posture regulated, and then return to the front using a spring, but in either case, the seedling splitting Since the rearward movement of the claw is forcibly performed while the posture of the seedling dividing claw is regulated by the cam mechanism, the rearward movement speed of the seedling dividing claw is faster than the forward movement speed of the machine. If it is too early, the action of forcefully pushing away the mud and moving the seedling roots backwards will work, whereas if it is too late, the dragging phenomenon of the claws cannot be fully resolved, which is disadvantageous. In the latter case, where a spring is used to return to the front side, it may be difficult to determine the return position of the seedling dividing claw, or the seedling dividing claw may be stuck in the bed soil when entering the seedling bed soil on the seedling rack. However, in this invention, the seedling dividing claw is moved backward by a spring, and returned to the front by a cam. Because of this structure, there is no inconvenience as mentioned above, 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 it is not forced into the mud. This has the advantage of being able to reduce the possibility of the seedling roots moving backwards by pushing away the seedlings, or the dragging of the nails.Furthermore, when dividing the seedling bed soil on the seedling stand, the seedling dividing nails must be moved against the planting arm. It is easy to determine the posture and 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 paddy wheels 5 with lugs that can swing up and down and move on the tiller.
An engine-related device 7 is mounted on the front part of the machine frame, which has a soil leveling float 6 that can freely move up and down and slides on the mud surface GL, and a seedling planting device 8 is attached to the rear of the machine frame. A control handle 9 extending rearward is connected to the attachment device 8.

The seedling planting device 8 has a seedling platform 10 which is located in a downwardly tilted position and is movable laterally toward the lower end of the slope, and which is capable of supplying seedlings. A seedling retrieval opening 12 is formed in a fixed rail 11 that supports the table 10 and the lower end of the placed seedling so as to be slidable in the horizontal direction. A seedling planting claw device 13 is provided which operates to take out a unit amount of seedlings from a seedling take-out port 12 and plant them.

As shown in FIGS. 2 and 3, the seedling planting claw device 13 has a planting arm 1 that circulates up and down with a base point in front of the seedling take-out port 12 in the direction of travel.
As the planting arm 1 circulates, the seedlings are passed through the seedling take-out port 12 in a posture and direction that is substantially perpendicular to the placement surface of the seedling stand 10, thereby removing the seedlings from the placed seedlings as a planting unit. A planting claw 2 capable of taking out a large amount of seedlings and holding the cut seedlings is equipped so as to be swingable back and forth, and a mechanism 14 for swinging this planting claw 2 is provided, and the above-mentioned planting The planting claw 2 is placed on the arm 1 at the lowest point P on the descending path.
A seedling pusher 1 that operates to push out the seedlings held by the claws 2 to the planting site when positioned at
5 is installed.

The mechanism for circulating the planting arm 1 pivots on 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 10. In addition, a swing link 17 is provided to regulate the attitude of the planting arm 1 around the pivot point with the non-claw attachment side end of the planting arm 1 being 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 14 for swinging the claw 2 acts on a shaft 2B on the side of the planting claw 2 which is rotatably supported by the planting arm 1, and elastically urges the planting claw 2 to swing rearward. A shaft 18 for pivotally supporting the rotary arm 16 fixed to the rotary arm 6 (this pivots around the pivot axis with respect to the planting arm 1 as the rotary arm 16 rotates). A cam mechanism consisting of a cam 4A fixed to a rotating cam 4A, and a rod 4B capable of swinging the planting claw 2 forward against elastic biasing force as the cam 4A rotates. 4, which has a cam 4A shape, and swings the claw 2 backward with the starting point P1 before reaching the lowest point P of the claw descending path and the ending point _P1 . On the other hand, the starting point is a point on the ascending route near the lowest point P, and the
The claw 2 is configured to swing forward with the end point of the ascending path located at approximately the same height as _P1 .

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 ascent first half trajectory portion a ₂ ′, and the first half ascent trajectory portion a ₂ is located behind the second half descent trajectory portion a ₁ , and overall, the claw trajectory a with respect to the aircraft is 8.
It has the shape of . Therefore, the length that the claws 2 travel through the mud during planting is determined by the mud surface of the claws 2 shown in Figure 5.
As is clear from the comparison between the movement trajectory A with respect to GL and the movement trajectory A' of the claw 2 with respect to the mud surface GL in the case where the claw 2 is not swung as shown in FIG.
It will be very short.

The seedling pushing tool 15 moves in the longitudinal direction of the claw 2 with the pair of seedling dividing claws 2a, 2a of the claw 2 as a guide.
In other words, it is held movably along the extrusion direction, and the operating mechanism of the seedling extrusion tool 15 is engaged with a long hole 20 formed in a fixed arm 19 connected to the planting arm 1. An interlocking pin 21 is attached to the seedling pushing tool 15 to push and move the seedling pushing tool 15 toward the tip of the claw as the seedling pushing tool 15 swings backward.

[Brief explanation of drawings]

The drawings show an embodiment of the rice transplanter according to the present invention. Fig. 1 is an overall side view of the rice transplanter, Fig. 2 is an enlarged side view with a partial cutout of the main part, and Fig. 3 is a partially cutaway enlargement of the main part. A plan view, Figure 4 is an enlarged sectional view taken along the - line in Figure 2,
Figure 5 is a diagram showing the ground movement locus of the tip of the nail, Figure 6
The figure is a diagram showing the locus of ground movement of the tip of the claw in a conventional device. 1... Planting arm, 2... Planting claw, 3... Spring, 4... Cam mechanism.

Claims (1)

[Scope of utility model registration request] A seedling platform 10 is arranged on the rear side in the direction of movement of the machine, and a seedling planting claw device 13 equipped with a planting arm 1 that circulates up and down at a position in front of the seedling platform 10 is arranged in front of it. In the 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 swingable in the front and rear directions with respect to the planting arm 1. In addition, a spring 14A is provided to urge the seedling dividing claws 2a, 2a to swing rearward, and the seedling dividing claws 2a, 2a are held in a forward swinging posture against the urging force of the spring 14A. , and this seedling dividing claw 2a,
When the seedling splitting claws 2a reach the lowest point of the descending path, the cam mechanism releases the forward swinging posture and causes the seedling dividing claws 2a, 2a to swing backward by the spring 14A. A rice transplanter characterized by being equipped with 4.