JPH0611207B2 - Drive structure of planting arm - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a crank arm having an arm end pivotally connected to a planting arm so as to transmit a driving force to the planting arm, and a drive for the crank arm. By controlling the swinging posture of the planting arm around the pivotal connection point during rotation, the locus of the planting arm is linked to the planting arm so as to set the seedling planting locus in a loop shape extending in the vertical direction. The present invention relates to a drive structure of a planting arm provided with each locus setting mechanism, and more particularly to a structure for setting the movement speed of the planting arm in the locus for planting seedlings.

[Conventional technology]

As described in the introduction, as a structure for setting the movement speed of the planting arm, for example, as shown in Japanese Patent Publication No. 54-33968, of the planting arm when planting seedlings in the field. There is one that aims to reduce the groove formed in the field at the time of planting seedlings by increasing the speed of movement.

[Problems to be solved by the invention]

However, since the seedling planting locus is formed in a loop shape that extends vertically and expands in the front-back direction, the movement speed of the planting arm when planting seedlings in the field during low-speed running of the rice planting machine. A groove may be formed in the field by a locus extending in the front-rear direction by simply increasing the height.

In other words, the seedling planting locus is formed in a loop shape as described above, and since there is a component that moves in the front-back direction even in the field scene, the number of times the planting arm operates with respect to the unit traveling distance of the aircraft is When the setting was changed, that is, when so-called inter-strain adjustment was performed, a groove was formed in the field when the seedlings were planted, which sometimes deteriorated the planting posture of the planted seedlings.

An object of the present invention is to configure a drive structure of a planting arm that is difficult to form a groove in a field to be easy to handle even when the distance between plants is greatly changed by adjusting the plants by rational modification.

[Means for solving problems]

The features of the present invention are, in the drive structure of the planting arm having the above-mentioned configuration, a state in which the crank arm is driven and rotated at a constant speed, and the crank arm is driven and rotated at a lower portion of the seedling planting locus. A power transmission mechanism for switching the power transmission mode between three states, that is, a state in which the motion speed of the arm is higher than that in the upper portion and a non-constant rotation phase, and a state in which the crank arm is stopped only at a predetermined rotation, are provided. The operation and effect are as follows.

[Action]

If the above features are configured as shown in FIGS. 1 and 2, for example, when the stock spacing is set to be relatively small by the stock spacing adjustment, the crank arm (27) is driven and rotated at a constant speed. By setting the transmission mode of the transmission mechanism (B), the ground seedling planting locus (St) is formed as shown in Fig. 5 (a), and when the plant spacing is set large, the crank Only by setting the transmission form of the power transmission mechanism (B) so that the drive rotation of the arm (27) becomes non-constant speed, the locus for ground seedling planting (St) of the planting arm (11) is shown in FIG. ) Will be formed.

In other words, if you set a large distance between the plants that drive the crank arm (27) at a constant speed, the locus of the planting arm (11) on the ground seedling
(St) is formed as shown in Fig. 5 (b), and the width in the field scene (P) is
Even if a groove (D ₁ ) is formed, the crank arm (2
If 7) is driven at a non-constant speed and the stock distance is set small,
Even when the locus (St) for ground seedling planting of the planting arm (11) is formed as shown in FIG. 6 (a) and a groove of width (D ₂ ) is formed in the field scene (P), By setting the driving rotation mode of the arm (27), the motion component of the planting arm (11) to the field scene (P) moving in the front-back direction from the ground seedling planting locus (St) can be offset by the traveling speed of the aircraft. Of.

When the power transmission mechanism (B) is set to the non-transmission state, the crank arm (27) stops only in a predetermined phase.
As shown in the figure, the planting arm (11) can be stopped at the upper position of the seedling planting locus (S).

〔The invention's effect〕

Therefore, it is difficult to form a groove in the field even when performing so-called sparse planting, in which the distance between plants is set wide by the modification of providing a power transmission mechanism that switches the power transmission mode to three states.
The drive mechanism of the planting arm was constructed that can stabilize the planting posture of the planted seedling and can also be used as each clutch.

〔Example〕

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

As shown in FIG. 4, an engine (3) and a mission case (4) are provided at the front of the machine body having front and rear wheels (1) and (2), and a hydraulic cylinder (5) is provided at the rear end of the machine body. The seedling planting device (A) is connected via a link mechanism (6) that is moved up and down by (1) to construct a rice transplanter.

As shown in the figure, the seedling planting device (A) is a transmission case (8) to which the power from the mission case (4) is transmitted via the transmission shaft (7), and the power from the transmission case (8). A pair of left and right chain cases (9), a seedling stand (10) on which mat-shaped seedlings (W) are placed, and four planting arms (11) operated by power from the chain case (9). Seedling planting device (A)
Three leveled floats arranged in parallel at the bottom of the ground (12)
In addition, this rice transplanter has a planting arm (11) for the unit traveling distance of the machine during seedling planting work.
It is configured to change the setting of the number of operations of so-called, so-called inter-plant adjustment and change of the movement speed below the field scene (P) of the seedling planting locus (S) of the planting arm (11). ing.

The transmission system of this rice transplanter is configured as shown in Fig. 3. In this transmission system, power is transferred from the engine (3) to the input shaft (14) of the mission case (4) by the belt type transmission mechanism (13). The power transmitted from this input shaft is used as a gear type transmission.
(15) via the differential (16) to the front wheel (1), and
It is transmitted to the intermediate shaft (17) for the rear wheel (2).

In addition, the power from the input shaft (14) can be set in four stages, that is, three stages of adjustment under standard conditions and one for sparse planting, and a gear type inter-plant adjustment device (18) and a torque limiter (19). ), Planted clutch
(20) Each of them is sequentially transmitted to the transmission shaft (7).

The power transmitted to the transmission case (8) of the seedling planting device (A) is the first shaft (21) and the screw shaft (22) for reciprocating the seedling stand (10).
Each of them is transmitted to the chain case (9) through the second shaft (23) for power distribution,
The power transmitted to (9) is transmitted through the output sprocket (24), the endless chain (25), the input sprocket (26), and the power transmission mechanism (B) as shown in FIG. 1, FIG. 1, and FIG. And is transmitted to the crank arm (27) that pivotally connects the planting arm (11).

As shown in FIG. 1, the arm part (11a) formed on the planting arm (11) and the swing link (28) pivotally connected to the chain case (9) (an example of a trajectory setting mechanism) are pivotally connected. When the crank arm (27) is driven and rotated, the locus (S) of the planting claw (11b) provided on the planting arm (11) forms a loop as shown in FIG. Formed and power transmission mechanism (B)
Is externally fitted onto the first circular gear (30), the first elliptical gear (31), and the crankshaft (32) provided on the shaft (29) connected to the input sprocket (26) in an idle state, and A second circular gear (33) that meshes with the first circular gear (30), and a second elliptical gear (33) that also fits over the crankshaft (32) in an idle state and that meshes with the first elliptical gear (31). 34), each of which is provided with a clutch sleeve (35) that is spline-fitted to the crankshaft (32), and is provided with the inter-stock adjusting device (18).
If any of the three levels in the standard state is set, the second
By transmitting the uniform speed circular motion force from the circular gear (33) to the crankshaft (32), the backward motion component in the lower part of the field scene (P) in the seedling planting locus (S) causes the aircraft to travel. When the inter-plant control device (18) is set to the sparsely planted state, the non-constant circular motion from the second elliptical gear (34) is transmitted to the crankshaft (32) so that As a result of the movement speed of the lower part of the locus of planting (S) being higher than that of the upper part, the locus of planting (S) is changed despite the driving speed and the drive ratio between the planting arm (11) changing greatly. Of these, the backward motion component below the field scene (P) is offset by the traveling speed of the airframe.

When the seedling planting locus (S) when the crankshaft (32) is moved in a non-uniform circular motion is divided into points for each unit time, as shown in Fig. 1, the distribution of the points on the locus becomes sparser toward the bottom. become.

Also, as shown in FIGS. 1 and 2, the second circular gear (33),
Claw bodies (33a) and (34a) for engagement are formed in the second elliptical gear (34), respectively, and the claw bodies (33a) and (34a) are formed on both side surfaces of the clutch sleeve (35). The recesses (35a), (35a) into which the lever is inserted are formed, and further, the clutch sleeve (35) is formed by the lever (36).
Only when the shift fork (37) operated by is engaged and the planting claw (11b) of the planting arm (11) is located above the seedling planting locus (S). 11) change of drive form,
A notch (35B) into which a stopper (38) is engaged is formed on the outer periphery thereof so that the driving can be stopped.

By the way, the lever (36) is set to 3
Lever guide (39) with two locking parts is a chain case
It is provided in (9).

[Another embodiment]

In addition to the above-described embodiment, the present invention is configured to automatically move the crank arm at a non-constant speed during sparse planting by linking the inter-strain adjustment device and the power transmission mechanism via a wire or the like. The transmission mechanism has a deformed gear other than an elliptical shape,
The present invention can be implemented in various ways including a deformed sprocket and the like, and a structure for sliding the trajectory setting mechanism, a structure for guiding with a long hole and the like.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a drive structure for an implantable arm according to the present invention. Fig. 1 is an exploded side view of the drive structure, Fig. 2 is a cross-sectional plan view of the drive structure, and Fig. 3 is a transmission of a rice transplanter. Diagram showing the system, Fig. 4 is an overall side view of the rice transplanter, Fig. 5 (a) is a locus for planting seedlings to the ground that is set for standard during standard operation, Fig. 5
(B) is a locus for ground seedling planting set for standard during sparse planting work, and Fig. 6 (a) is a locus for ground seedling planting set for sparse planting during standard work, Fig. 6 (b) ) Is a locus for planting seedlings to the ground set for sparse planting during sparse planting work. (11) …… Planted arm, (27) …… Crank arm, (28)…
… Trace setting mechanism, (B) …… Power transmission mechanism, (S) …… Trace with seedlings.

Claims (1)

[Claims] 1. A crank arm (27) having an arm end pivotally connected to the planting arm (11) so as to transmit a driving force to the planting arm (11), and a drive rotation of the crank arm (27). By setting the swinging posture of the planting arm (11) around the pivotal connection point at the time, the seedling planting locus (S) of this planting arm (11) is set in a loop shape extending in the vertical direction. As described above, in the drive structure of the planting arm provided with each locus setting mechanism (28) linked to the planting arm (11), the crank arm (27) is driven and rotated at a constant speed. A state in which the crank arm (27) is driven and rotated at a non-constant rotational phase such that the movement speed of the planting arm (11) in the lower part of the seedling planting locus (S) is higher than that in the upper part, A power transmission mechanism that switches the power transmission mode between three states, that is, a state in which the crank arm (27) is stopped only by a predetermined rotation ( B) A drive structure for an implantable arm comprising: