JPS5854774B2 - Planting claw drive structure in rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a planting claw drive structure in a rice transplanter.

Generally, the above-mentioned planting claw drive structure transmits the power of the installed engine to the planting claws via a gear transmission mechanism, but there may be meshing errors in the gear transmission mechanism and manufacturing errors in various other transmission connections. During assembly, backlash due to errors, etc. accumulates, and the driving locus of the planting claw changes, such as the planting claw operates in advance due to inertia, and as a result, the seedling retrieval posture of the planting claw and the seedling removal position change. When planting, there is a risk that the posture may change.

This problem can be solved to some extent by improving the accuracy of the gear transmission mechanism and the various transmission connections and eliminating assembly errors, but this results in an expensive structure. Put it away.

Another solution to this problem is to put an elastic body such as rubber in sliding contact with the rotating shaft in the drive mechanism to resist the inertial movement of the planting claws, but in this case However, there was a problem in that the elastic body wore out early, making it difficult to ensure reliable operation over a long period of time.

The present invention has been made with the above-mentioned circumstances in mind, and
It is an object of the present invention to provide a planting claw drive structure for a rice transplanter that is inexpensive and simple in structure, yet exhibits reliable operation over a long period of time, and is capable of solving the above problems.

Embodiments of the present invention will be described in detail below with reference to illustrative drawings.

The figure shows the planting unit installed at the rear of the walking rice transplanter, with a pair of left and right units that rotate in the vertical direction from the seedlings placed on the seedling platform 1 that moves horizontally and back and forth, drawing a trajectory A. The planting claws 2, 2 are used to sequentially scrape off block seedlings one by one, and plant two rows of seedlings on the mud surface.

In addition, the planting claws 2, 2 are driven by the output of an engine (not shown) mounted on the aircraft body, as shown in FIG. The rotation of the crank arm 6.6, which is transmitted to the rotating shaft 5 via a gear transmission mechanism and connected to both ends of the rotating shaft 5, causes the swinging link 7.6 to pivot to the planting mission case 4. a planting arm 8.8 whose one end is pivotally connected to the tip of 7 and whose middle part is pivotally connected to the crank arm 6.6;
The planting claws 2, 2 are attached to the tips of the arms 8.8.

Further, a rotating shaft 9 on the transmission upper side that is bevel-connected to the rotating shaft 5 is housed in the cylindrical case 4a of the planting case 4, and is shown in FIGS. 2 and 3. As shown in FIG.
are arranged in sliding contact with each other, and the hard members 10a, 10b are elastically biased toward the rotating shaft 9 by an elastic body 11 made of rubber or the like fitted inside the cylindrical case 4a.

According to the above configuration, the rotating shaft 9 and the hard member 10a10b
Since a braking action is applied to the rotation of the rotating shaft 9 due to the sliding resistance between the two and is absorbed, the planting claw 2.degree. 2 is prevented from preceding operation and performs a predetermined operation.

Note that in implementing the present invention, other rotating shafts may be used as the rotating shaft 9, such as the rotating shaft 5 used in the embodiment, and located on the lower side of the transmission where it is easy to absorb accumulated backlash. It is easier to bring out the effects of the present invention significantly if it is implemented using a rotating shaft.

Further, when resin is used as the hard members 10a and 10b as in the embodiment, it is preferable to embed asbestos and glass fibers in the resin.

In addition, in order to achieve the same effect as the present invention, the hard member 10a
, 10b may be brought into sliding contact with the inner surface of the cylindrical case 4a and biased outward by an elastic body 11 externally fitted onto the rotating shaft 9, but in this case, the inner surface of the cylindrical case 4a may be It is necessary to finish the shaft with high accuracy, and the present invention is easier to implement at a low cost because the rotary shaft 9, whose outer surface is normally finished with high precision, is used as the sliding surface.

To summarize as above, the planting claw drive structure in the rice transplanter according to the present invention has a hard member 10a in the shape of a half-tube with high wear resistance that slides on the outer surface of the rotating shaft 9 in the drive mechanism of the planting claws 2.
, 10b are elastically biased toward the rotating shaft by an elastic body 11 fitted inside the cylindrical case 4a in which the rotating shaft 9 is housed.

In other words, since the hard members 10a and 10b are brought into sliding contact with the rotating shaft 9, and the sliding resistance is used to absorb the looseness accumulated in the drive mechanism, wear of the parts may occur over a long period of time. In addition, when deploying this hard i member 10alOb, the rotating shaft 9 that is inevitably present in this type of drive mechanism and the cylindrical case 4a that houses this rotating shaft 9 can be rationalized. The elastic body 11 fitted inside the cylindrical case 4a
This can be done with a simple structure in which the hard member IQa, 10b is biased toward the rotating shaft 9, which is advantageous in manufacturing.

[Brief explanation of drawings]

The drawings show an embodiment of the planting claw drive structure in the rice transplanter according to the present invention, FIG. 1 is a side view of the planting section, FIG. 2 is a cross-sectional plan view of the planting claw drive mechanism, and FIG. 3 is a cross-sectional view of the planting claw drive mechanism. ll in Figure 2
It is a sectional view taken along the line l-1. 2... Planted nail, 4a... Cylindrical body, 9...
...Rotating shaft, 10a, 10b...Hard member, 11...Elastic body.

Claims (1)

[Claims] 1 Hard member 10a, 1 in the shape of a half-tube with high wear resistance that slides into contact with the outer surface of the rotating shaft 9 in the drive mechanism of the planting claw 2
0b is elastically biased toward the rotating shaft side by an elastic body 11 fitted inside a cylindrical case 4a that houses the rotating shaft 9.