JPH01120213A - Driving structure for planting arm - Google Patents

Abstract

PURPOSE:To prevent the formation of groove on a field caused by the change in the form of a seedling transplantation locus even in the case of largely changing the distance between hills, by providing a locus-changing mechanism in addition to a locus-setting mechanism. CONSTITUTION:A seedling transplantation locus is set to an elliptic form SN in the case of seedling transplantation at a standard hill space, by holding a shaft of a swinging link 15 as a locus-setting mechanism. In the case of sparse transplantation, the pivot connection point R is made to move along a loop locus T by operating a locus-changing mechanism B and the seedling transplantation locus is changed to a form SW having widened loop width at the lower part.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a crank arm whose arm end is pivotally connected to the planting arm so as to transmit driving force to the planting arm, and a drive system for the crank arm. By regulating the swinging posture of the planting arm around the pivot connection point during rotation, the planting arm is connected to the planting arm so that the seedling planting locus of the planting arm is set in a vertical loop shape. The present invention relates to a drive structure for a planting arm that is provided with a locus changing mechanism for changing the trajectory, and more specifically, to a structure for changing the shape of the seedling planting locus.

[Conventional technology]

As a structure for switching the shape of the seedling planting locus like a snowflake, for example, there is a structure shown in Japanese Patent Application Laid-Open No. 105419/1983, and in this structure, the swinging end of the swinging link and the planting It is configured to change the shape of the seedling planting locus by changing the connection distance with the attachment arm.

[Problem that the invention seeks to solve]

Here, considering the seedling planting operation of the planting arm, since the seedling planting trajectory has a movement component in the front and back direction even in the field, so that this movement component can be offset by the traveling speed of the machine, The operating speed of the planting arm, the shape of the seedling planting trajectory, and the traveling speed of the aircraft are determined, and as a result,
When planting seedlings, the size of the grooves formed in the field is kept to an extremely small value.

In addition, in warm regions, the spacing between plants may be set relatively large by so-called plant spacing adjustment, which changes the setting of the number of operations of the planting arm per unit mileage of the aircraft. During this work, the relationship between the operating speed of the planting arm and the traveling speed of the aircraft was greatly disrupted, which sometimes caused the grooves formed in the field during seedling planting to expand, leading to the unstable posture of the planted seedlings. .

Therefore, by changing the shape of the seedling planting trajectory as in the above reference, the movement component in the longitudinal direction of the seedling planting trajectory in the field can be adjusted to the traveling speed of the machine without changing the driving speed of the planting arm. Although it is conceivable that this could be offset, the structure of the cited example does not sufficiently increase the movement component of the seedling planting trajectory in the front-rear direction below the field, and there is room for improvement.

An object of the present invention is to construct a drive structure for a planting arm that does not easily form grooves in the field by changing the seedling planting locus even when the distance between plants is greatly changed by adjusting the distance between plants through rational modification. .

[Means for solving problems]

A feature of the present invention is that in the drive structure of the planting arm having a snow raising configuration, the trajectory setting is performed so that the lower portion of the seedling planting trajectory is switched between a predetermined loop width and a loop width larger than this loop width. The present invention includes a trajectory changing mechanism that changes the operating trajectory of the connection point between the mechanism and the planting arm between a reciprocating state along the same route and a loop state having at least a partially different route. The action and effect are as follows.

[For production]

If the above characteristics are configured as shown in FIGS. 1 and 2, for example, when planting seedlings between standard plants, the axis (Q) of the swing link (15) as a trajectory setting mechanism can be maintained. Then, the seedling planting trajectory (SN) is set to an oval shape, and when planting line seeds, by operating the trajectory changing mechanism (B), the seedling planting trajectory (SN) is set as shown by the solid line in Fig. 1. The shape will be formed.

Note that the respective seedling planting trajectories (SN) and (Sw) partially overlap as shown in Fig. 1, and when the trajectory changing mechanism (B) is operated, the pivot connection point (R) changes to the first one. Draw a loop-shaped trajectory (T) as shown in the figure.

In addition, in the above settings when planting seedlings between standard plants,
The ground seedling planting trajectory (s M t ) is shown in Figure 4 (A), and if you try to perform line seed planting on this trajectory, Figure 4 (TI
), a groove is formed in the field (P) by the in-ground seedling planting trajectory (SNt), and conversely, in the above setting at the time of line seed planting, the in-ground seedling planting trajectory (SNt) is 5
As shown in Figure (II), if you try to work between standard plants using this trajectory, a groove will be formed in the field (P) due to the in-ground seedling planting trajectory (SNt), as shown in Figure 5 (A). That will happen.

〔Effect of the invention〕

Therefore, even if the distance between plants is significantly changed by installing a trajectory changing mechanism, changing the shape of the seedling planting trajectory makes it difficult to form grooves in the field and stabilizes the posture of the planted seedlings. A driving structure for the arm was obtained.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 3, an engine (4
), a transmission case (5) is installed, and a four-row seedling planting device (A) is connected to the rear end of the machine via a link mechanism (7) that moves up and down by the drive of a hydraulic cylinder (6). The machine is configured.

As shown in the same figure and Figures 1 and 2, the seedling planting device (A)
is connected to the transmission case (5) via the transmission shaft (8).
A transmission case (9) to which the power is transmitted, a pair of left and right chain cases (10) to which the power from the transmission case (9) is transmitted, and a pair of chain cases (10) provided at the rear end of each of these chain cases (10). A planting arm (11), a seedling stand (12) for placing matted seedlings (-), and three soil leveling flows arranged in parallel at the bottom of this seedling planting device (A) (13) respectively. It also consists of a planting arm (1
1) is pivotally connected to the arm end of the crank 7-arm (14) which rotates with power from the chain case (10), and the arm part (LIA) formed on this planting arm (11) and the chain case By pivotally connecting the swinging end of the swinging link (15) (an example of a trajectory setting mechanism) pivotally supported at the rear end of (10), the planting claw provided on the planting arm (11) (
The seedling planting locus (S) of 16) is formed in a loop shape in the vertical direction.

In addition, in this rice transplanter, a so-called plant spacing adjustment device (not shown) is installed in the mission case (4) to change the setting of the number of operations of the planting arm (11) per unit travel distance of the rice transplanter during seedling planting work. ), and this plant spacing adjustment device allows you to select between standard plant spacing and relatively large plant spacing used for line seed planting.
With this rice transplanter, when the standard distance between plants is selected in the plant spacing adjustment, the seedling planting trajectory will follow the shape shown by the broken line in Figure 1.
If a relatively large distance between plants is selected, the seedling planting locus (SW) is set in the shape shown by the solid line in Figure 1, and it is formed in the field scene (P) at the time of seedling planting. This allows the grooves to be made as small as possible.

That is, as shown in FIGS. 1 and 2, the chain case (10) has crank arms (14) at both ends.
, (14) is freely rotatably supported, and a sprocket (18) through which power is transmitted and a first gear (19) are attached to this crankshaft (17). ) is transmitted to the second gear (20).

Further, a cam body (22) is shiftably spline-fitted to the support shaft (21) that freely rotatably supports the second gear (20), and a pin (22a) protruding from this cam body (22) and a second 2 gear (
20) and rotate integrally by fitting into the through hole (20a).

This cam body (22) is in contact with a roller (24a) of an arm (24) pivotally supported on a shaft (23), and the swinging end of the arm (24) is connected to the upper and lower rods (25), (25). The retaining member (26) cooperates with the engaging member (26) in the pinched state.
) has an elongated hole ('10a) at the rear of the chain case (10).
) and (10a) are engaged with a support rod (27) passing through them.

Furthermore, the swing links (15), (15) are pivotally connected to both outer ends of the support rod (27).
When driving the planting arm (11), the first gear (19),
The swing link (15) is driven by the power that is sequentially transmitted to the second gear (20), the cam body (22), and the arm (24).
As a result of the pivot point (b) moving up and down, the planting arm (
At the same time, the connection point (R) between the arm part (ILA) of 11) and the swing link (15) draws a loop-shaped trajectory (T), and at the same time the planting claw (16) provided on the planting arm (11) The seedling planting locus (9) is formed in a loop shape as shown by the solid line in FIG.

The cam body (22) is connected to the second gear (2) by a shifter (28), a rod (29), and an operating lever (30)
0), and when the cam body (22) and the second gear (20) are disengaged,
Due to the biasing force of the spring (31), the support rod (27)
By holding the lower position, the arm portion (I
At the same time, the connection point (R) between IA) and the swing link (15) draws an arcuate trajectory (not shown), and at the same time, the planting claw (16)
As shown by broken lines in FIGS. 1 and 3, the seedling planting locus (9) is formed in an oval shape that partially overlaps the seedling planting locus (9).

Incidentally, the first and second gears (19), (20), cam body (22), arm (24), engagement member (26), etc. are collectively referred to as the trajectory changing mechanism CB), and the standard distance between When set to , the shape of the seedling planting trajectory (S8) is set to the aforementioned oval shape, and when the distance between plants for line seed planting is set, the shape of the seedling planting trajectory (S, l) is set to an oval shape. ) By setting the seedling planting locus (SW) formed in a shape with a loop width (L8) larger than the loop width (LH) at the bottom of Enlargement of the formed groove is prevented.

[Another example]

In addition to the above-described embodiments, the present invention may have a structure in which the trajectory setting mechanism slides, or may be configured to be linked or electrically operated.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of a drive structure for a planting arm according to the present invention, and FIG. 1 is a partially cutaway side view showing the drive structure, and FIG.
The figure is a cross-sectional plan view showing the drive structure, Figure 3 is an overall side view of the rice transplanter, Figure 4 (a) is the ground seedling planting trajectory set for standard during standard operation, and Figure 4 ( ) is the ground seedling planting trajectory set as standard during line type work, Figure 5 (a)
Fig. 5 (El) shows the on-ground seedling planting trajectory set for the line type during standard work, and Fig. 5 (El) shows the on-ground seedling planting trajectory set for the line type during the line type work. (11)... Planting arm, (14)...
・Crank arm, (15)... Locus setting mechanism, CB)... Locus changing mechanism, (L,)...
...Predetermined loop width, (Ll, l)...Enlarged loop width, (S)...Seedling planting trajectory, (R)...
...Connection point.

Claims (1)

[Claims] A crank arm (14) whose arm end is pivotally connected to the planting arm (11) so as to transmit driving force to the planting arm (11), and a planting arm when the crank arm (14) is driven to rotate. By regulating the swinging posture around the pivot connection point of (11), the planting arm (11) can be planted so that the seedling planting locus (S) is set in a vertical loop shape. A driving structure for a planting arm, which is provided with a trajectory setting mechanism (15) connected to an arm (11), wherein the lower part of the seedling planting trajectory (S) is set to a predetermined loop width (L_N). , this loop width (L_N
) In order to switch to a larger loop width (L_W),
a state in which the operation trajectory of the connection point (R) between the trajectory setting mechanism (15) and the planting arm (11) reciprocates along the same route;
A drive structure for a planting arm comprising a locus changing mechanism (B) that changes the setting to a loop state having at least a part of a different route.