JPH0140415Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a planting depth adjusting device in a rice transplanter.

A conventional planting depth adjustment device for a rice transplanter, for example, as shown in FIG. The structure is such that the planting depth can be changed by adjusting the relative height of the float with respect to the aircraft body by vertically moving the control lever and the part near the planting part of the float for sliding on rice fields. .

However, as shown in the figure, the connecting structure of the operating lever to the hanger is such that the boss part Ro' welded to one end of the lever is simply fitted into a pin that is inserted through the bracket through the hanger so that it can swing from side to side. Since the vertical rest is held by holding both the upper and lower sides of the boss part R' with brackets, backlash is a large error due to processing variations, which causes variations in planting depth and reduces planting accuracy. This was a contributing factor. In addition, due to the structure, the maximum bending moment was applied to the welded portions of the boss portion RO' and lever RO, which caused problems in terms of strength.

The present invention was developed to solve the above-mentioned problems, and its purpose is to simplify the structure while minimizing the effects of errors due to backlash and processing variations. To provide a planting depth adjustment device for a rice transplanter that can reduce the number of seeds, ensure a stable planting depth, achieve uniform growth of seedlings, and also has excellent strength. That is.

To explain the structure of the present invention with reference to an embodiment shown in the drawings, 1 is a float for sliding on rice fields, the front part of the float 1 in the direction of movement of the aircraft is connected via a bending mechanism (not shown), and the rear part is The parts near the planting part 2 are attached to the fixed side of the body via hangers 3 in a suspended state. The float 1 slides on the rice field to support the load of the machine (this is done together with the wheels 4, 4) and performs the final leveling of the rice field.By changing the relative height of the float 1 to the machine, the float 1 can be used to seed seedlings. It has a function to adjust the planting depth.

FIGS. 2 and 3 show the structure of the planting depth adjusting device A, and 5 is an operating lever thereof. The operating lever 5 is bent into an L-shape on the side, consisting of a pivot portion 5' relative to the hanger 3 and an operating portion 5'', and the pivot portion 5' is formed through a hole 3'' provided in the upper bulging portion 3' of the hanger 3. The upper surface of the base of the operating part 5'' is inserted into the hanger 3 from below and is pivotally supported via a washer 6 and a pin 7 so as to be swingable from side to side.
The hanger 3 is abutted and supported by a support portion 3a formed on the back surface of the rear end, and a downward projecting piece 3b is integrally formed at the rear end of the hanger 3. is provided with a guide elongated hole 3'b that penetrates and supports the operating portion 5'' of the operating lever 5.These support structures prevent the operating lever 5 from swinging in the vertical direction relative to the hanger 3, and the operating lever 5 is designed to move up and down integrally with the hanger 3 around the pin shaft 12.

Reference numeral 8 denotes a guide cover fixed to the drive case 10 via mounting bolts 9, 9, and the guide cover 8 has a locking hole 8' for the operating lever 5 cut out in multiple stages at the top and bottom. Reference numeral 11 denotes a spring for positioning the lever, and this spring 11 positions and holds the operating lever 5 in one of the locking holes 8' by passing over the fulcrum as shown in FIG.

The hanger 3 is pivotally connected to the fixed side of the body (drive case 10) and the float 1 side via pin shafts 12 and 13, respectively, as in the conventional case.

FIG. 5 shows another embodiment, in which the pivot portion of the hanger 3 to the drive case 10 and the float 1 has a structure opposite to that of the above example, and in this structure, the operation The bending moment applied to lever 5 is in the opposite direction (upward) from the above example.
In order to achieve this, a configuration is shown in which the pivot portion 5' of the lever 5 penetrates from above the hanger 3 and is supported from below by a support portion 3b.

In the above-mentioned configuration, when the operating lever 5 is lifted upward, the hanger 3 integrally rotates about the pin shaft 12 from the state shown by the solid line in FIG. 2 to the state shown by the phantom line in FIG. 1 is pushed down and its height relative to the aircraft becomes lower (the height of the aircraft from the rice field becomes higher), so the planting depth becomes shallower.Conversely, if you push down the control lever 5, float 1 is pushed up. This will increase the planting depth,
By changing the locking position of the lever 5 with respect to the locking hole 8' of the guide cover 8, the planting depth can be appropriately adjusted to the optimum depth.

By the way, even if the planting depth is set by operating the lever, in the conventional structure shown in Fig. 4, if there is play or error due to machining variations in the pivotal joint between the hanger and the operating lever, the play may occur during the planting operation. However, in this invention, the planting depth varies and the planting accuracy is reduced.
A pivot portion 5' of the lever 5 is supported so as to be rotatable left and right with respect to the hanger 3, and one side of the base of the operating portion 5'' is supported in contact with the support portion 3a at the rear end of the hanger 3, and is The other side of the base of the portion 5'' is held at the inner bottom edge of the elongated guide hole 3'b provided in the protruding piece 3b, and therefore, the supporting portions 3a and 3c that prevent the lever 5 from swinging up and down independently are attached to the lever. Since they are provided on both the pivot part 5' side of the hanger 3 and the operating part 5'' side, and are separated by a predetermined distance W, the pivot part between the hanger 3 and the lever 5 may have some play or errors due to manufacturing variations. There is almost no vertical movement between the hanger 3 and the lever 5.Therefore, the inconvenience of uneven planting depth is reliably prevented, and the planting can always be done at the desired uniform depth.
Planting accuracy can be further improved.

In addition, the load applied to the operating lever 5 from the float 1 side via the hanger 3 is transferred to the above two support portions 3.
a, 3c, so it is not concentrated in one place like in the conventional case, and the maximum bending moment applied to the lever 5 is the same as that of the support without bending or welding, as is clear from the structure shown in Fig. 2. Department
Since it is a 3a part, it is extremely advantageous in terms of strength and can maintain stable quality.

As mentioned above, the present invention pivots between the fixed side of the fuselage and the area near the planting part of the float for rice field skiing through a hanger that has an operating lever pivotably supported on one end so as to be able to swing left and right. In this device, the planting depth can be changed by adjusting the relative height of the float with respect to the machine body through manual operation, and the support part that prevents the above-mentioned control lever from moving vertically relative to the hanger is attached to the pivot side and the control part side. Since they are provided on both sides at a predetermined interval, the structure is simple, and even if errors occur due to backlash or processing variations in the pivot joint between the hanger and the operating lever, the effects of such errors can be minimized. It is possible to reliably eliminate the inconvenience caused by shallow and shallow variations in planting depth, always ensuring a stable and uniform planting depth, and not only can further improve the accuracy of seedling planting, but also has extremely high strength. Advantageously, stable and high quality products can be provided at low cost.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a rice transplanter equipped with the present invention, Figure 2 is a longitudinal side view of the main parts, Figure 3 is a plan view of the main parts, and Figure 4 is a partially cutaway longitudinal side view of the conventional example. FIG. 5 is a partially cutaway vertical side view showing another example. In the figure, 1 is a float, 2 is a planting part, 3 is a hanger, 3a, 3c are support parts, 5 is an operating lever, 5'
is the pivot part, and 5″ is the operation part.

Claims (1)

[Scope of utility model registration request] The fixed side of the fuselage and the area near the planting part of the rice field slide float are pivotally connected via a hanger with an operating lever supported on one end so that it can swing left and right, and the float is moved relative to the aircraft by moving the operating lever up and down. In the device in which the planting depth can be changed by adjusting the height, there is provided a support part that prevents the operating lever from moving vertically relative to the hanger on both the pivot portion side and the operating part side and at a predetermined interval. A planting depth adjustment device for a rice transplanter, characterized in that it is provided with: