JPH0611205B2 - 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 on the above-mentioned seedling planting locus.

[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 transplanter can be reduced. If it is simply raised, a groove extending in the front-rear direction may form a groove in the field.

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 construct a drive structure for a planting arm in which it is difficult to form a groove in a field even when the distance between plants is greatly changed by adjusting the plants by rational modification.

[Means for solving problems]

A feature of the present invention is that, in the drive structure of the planting arm having the structure described above, the crank arm is driven and rotated at a constant speed, and the drive rotation of the crank arm is performed in a lower part of the seedling planting locus. It is provided with a power transmission mechanism that switches the power transmission mode to a state in which the movement speed of the attached arm is higher than that of the upper portion and is performed at a non-constant rotational phase.
Its action 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 the distance between plants is set to a large value while the crank arm (27) is being driven at a constant speed, the locus for ground seedling (St) of the planting arm (11) is formed as shown in Fig. 5 (b), and Even if a groove of width (D ₁ ) is formed on the surface (P),
When the distance between plants is set small while (27) is driven at a non-constant speed, the locus (St) for planting seedlings on the grounding arm (11) is shown in Fig. 6 (a).
Even when a groove of width (D ₂ ) is formed in the field scene (P) by forming as shown in Fig. 7, the planting arm for the field scene (P) is set by setting the driving rotation form of the crank arm (27). It is possible to offset the motion component moving in the front-back direction of the ground seedling planting locus (St) in (11) by the traveling speed of the aircraft.

[Effects of the Invention] Therefore, even if so-called sparse planting is performed in which the distance between the plants is set relatively wide by the modification of providing a mechanism for switching the power transmission form to the crank arm, it is difficult to form a groove in the field, and the planting The drive structure of the planting arm that can stabilize the planting posture of the seedlings is configured.

〔Example〕

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

As shown in FIG. 4, the engine (3) and the mission case (4) are provided at the front of the machine body including the front and rear wheels (1) and (2), and the hydraulic cylinder (5) is provided at the rear end of the machine body. The rice transplanter is configured by connecting the seedling planting device (A) through the link mechanism (6) that moves up and down.

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 the input shaft (14) is transmitted via the gear type transmission (15) to the differential device (16) for the front wheel (1) and the intermediate shaft (17) for the rear wheel (2). ).

In addition, the power from the input shaft (14) can be set in four stages of three-stage adjustment in the standard state and adjustment for sparse planting, a gear type inter-plant adjustment device (18), a torque limiter (19). ), Planted clutch (2
Each of 0) is sequentially transmitted and 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. 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 higher movement speed of the lower part than the upper part of the seedling planting locus (S), the seedling planting locus (S ), 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-constant circular motion is divided into points for each unit time, as shown in Fig. 1, the distribution of the points on the locus becomes lower 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 on the second elliptical gear (34), respectively, and these claw bodies (33a) and (34a) are formed on both side surfaces of the clutch sleeve (35). The recesses (35a) and (35a) into which the clutch is inserted are formed, and further, this clutch sleeve (35) is
Only when the shift fork (37) operated in 6) is engaged and the planting claw (11b) of the planting arm (11) is located above the seedling planting locus (S). A stopper (3) is provided on the outer periphery of the arm (11) so that the drive form can be changed and the drive can be stopped.
The notch (35B) into which 8) engages is formed.

Incidentally, the chain case (9) is provided with a lever guide (39) having three locking portions so that the lever (36) can be set to three positions.

As shown in FIG. 1, a tightener (41) pivotally supported by a support shaft (40) is provided inside the chain case (9), and the tightner (41) is attached to the second shaft (23). Hydraulic piston (42) driven by the power of
In order to apply tension to the endless chain (25) by the pressing force of 3) and increase the tension as the planting arm (11) is driven at a higher speed, the orifice (44) is provided in the oil passage from the hydraulic pump (42). )
The oil discharge passage (45) having the is formed.

[Another embodiment]

In addition to the above-described embodiment, the present invention is configured such that the inter-strain adjustment device and the power transmission mechanism are linked via a wire or the like to automatically move the crank arm at a non-constant velocity during sparse planting. The transmission mechanism is provided with a deformed gear other than an elliptical shape, a deformed sprocket, and the like, and the trajectory setting mechanism can be variously implemented such as a sliding movement structure and a structure in which it is guided by an elongated hole.

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 drive structure for a planted arm, which is provided with a power transmission mechanism (B) for switching the power transmission mode.