JP2534143B2 - Planting rod stop device for transplanter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a planting rod stopping device in a transplanter such as a rice transplanter and a crop transplanter.

2. Description of the Related Art A conventional planting rod stopping device in a transplanter, for example, a rice transplanter, is generally constructed by engaging and disengaging a drive side claw clutch and a driven side claw clutch provided on a shaft (planter arm shaft). When the clutch is engaged and disengaged, a recess having a rotation-preventing surface provided on the driven side pawl clutch is fitted into the stopper to regulate the stop position on the rotation locus of the planting rod. . Then, as shown in FIG. 7, the stop range on the planting rod rotation locus (i) is from the upper part of the rearward traveling stage where the planting rod finishes planting the seedlings and rises from the paddy field to the upper portion of the previous traveling sequence (Y Many are set to (range).
However, the upper part (closer to the end) of the backward movement where the planting rod rises is the place where the resistance is the largest in the turning trajectory of the planting rod, and when the planting rod stops at this place. Residual torque is generated in the contact portion between the rotation prevention surface provided on the clutch and the stopper, and both are in a bite state, so that sliding resistance becomes large and there is a risk of malfunction of the clutch (difficult to engage the clutch).

In particular, when an auxiliary working device such as a fertilizer applicator is attached to the transplanting machine, a reverse torque is applied from the working device side when the planting rod is stopped, which tends to be a problem.

Means for Solving the Problems The planting rod stopping device for a transplanter according to the present invention has been made to solve the above-mentioned problems. First, a driving side claw clutch 17 and a driven side provided on a shaft 15 are provided. When the clutch C is engaged and disengaged, the planting clutch C is engaged and disengaged, and when the clutch is disengaged, the recessed portion 22 having the rotation preventing surfaces A ′ and B ′ provided on the driven side pawl clutch 18 is relatively engaged with the stopper 23. In the planting clutch device configured to regulate the stop position of the planting rod 7 on the rotation locus L, the planting rod 7 is capable of disengaging the planting rod 7 within a predetermined stop range α. Forward from the apex position L _T, which is the boundary between the trailing-side trajectory on the ascending stroke side where the operating resistance of the planting rod 7 is large on the moving trajectory L and the forward-side trajectory on the descending stroke side where the operating resistance of the planting rod 7 is small And the planted seedling scraping section at the lower end of the seedling platform 6 within the stop range α. The recessed portion 22 with respect to the stopper 23 so that
It is characterized in that the turning timing of the planting rod 7 at the time of fitting is set.

Secondly, the planting clutch C is turned on and off by engaging and disengaging the driving side claw clutch 17 and the driven side claw clutch 18 provided on the shaft 15, and the rotation blocking surface A ′ provided on the driven side claw clutch 18 when the clutch is disengaged. In the planted clutch device in which the recessed portion 22 having B'and B'is relatively fitted into the stopper 23 to regulate the stop position on the rotation locus L of the planted rod 7, the driven side pawl clutch 18 is used as a shaft. The recessed portion 22 is formed on the outer peripheral side of the collar portion 18 ′ provided on the outer periphery of the driven side claw clutch 18 by sliding in the 15 direction to engage and disengage with the drive side claw clutch 17, and both ends of the recessed portion 22 are formed. The area between the rotation blocking surfaces A'and B'corresponds to the stopping range α of the planting rod 7 on the rotation locus L, and the rear side B of the stopping range α of the planting rod 7 is the rotation locus L of the planting rod. of the recessed portion 22 when fitted against the stopper 23 to be positioned forward side of the vertex position L _T on It is characterized by setting the rotation timing of Tsuke杆 7.

Thirdly, the planting clutch C is turned on and off by engaging and disengaging the drive side claw clutch 17 and the driven side claw clutch 18 provided on the shaft 15, and the rotation blocking surface A ′ provided on the driven side claw clutch 18 when the clutch is disengaged. In the planted clutch device in which the recessed portion 22 having B'and B'is relatively fitted into the stopper 23 to regulate the stop position on the rotation locus L of the planting rod 7, the driven side pawl clutch 18 is provided. The contact surface of the stopper 23 with respect to the rear rotation blocking surface B ′ of the concave portion 22 is formed as an inclined surface S.

Action First, when the planting clutch is disengaged, the planting rod has a large resistance on its turning locus and does not stop at the part from the upper part of the reverse side to the locus apex, but always has momentum in the forward direction. When the clutch is disengaged, there is no biting due to residual torque in the contact area between the rotation prevention surface of the clutch and the stopper when the clutch is disengaged. Will be smooth and good. Secondly, when the clutch is disengaged, the inclined surface of the stopper and the rotation prevention surface of the clutch come into contact with each other while sliding, so the residual torque at that moment is reduced, the phenomenon of biting between the clutch and stopper is eliminated, and clutch operation is always smooth. To be done.

Embodiment Next, the configuration of the present invention will be described with reference to an embodiment shown in the drawings. In the drawing, as a transplanter, a pair of left and right body propulsion wheels 3 are vertically mounted via a chain case 1 and a sub chain case 2, and seedlings are mounted on the rear part of a traveling body 5 equipped with floats 4 and 4a for sliding down a field. A walk-type rice transplanter provided with a planting section P including a platform 6, a planting rod 7 and the like is illustrated (see FIG. 8). As shown in FIG. 9, the wheel 3 is equipped with a balance type lifter 9 connected to a lift cylinder 8, a lift rod 10, a lift arm 11 and the like, and a wheel up / down mechanism and a rolling mechanism to cope with unevenness of a tiller. Is ready to go. Reference numeral 12 denotes a rotation fulcrum portion of the chain case 2 and the lift arm 11. The rotation fulcrum portion 12 is provided with a collar 13 made of a material having a low hardness (for example, a living thing that is hardened to the hardened lift arm 11 or the like). It is a detachable interposer and is a low-cost component without replacing the expensive chain case 2 or lift arm 11 when worn (the rotation fulcrum 12 is constantly exposed to muddy water during work and wears quickly). Only 13 can be replaced.

FIG. 5 is a schematic view of the planted clutch mechanism, which is a shaft (crank arm shaft) rotatably supported in the drive case 14.
Drive side claw clutch 17 with sprocket 16 fixed on 15
Is loosely fitted at a predetermined position, and the driven side claw clutch 18 is urged toward the clutch inward side through a return spring 20 slidably only in the axial direction and provided on the side opposite to the contact surface of the shifter 19. In this state, it is opposed to the drive side claw clutch 17, and the on / off of the planting clutch C is performed by an operation lever (planting lever) 21 linked to the shifter 19.

The sprocket 16 is interlocked with the spiral shaft (not shown) of the left-right reciprocating drive mechanism of the seedling placing table 6 via a transmission chain 16a and an intermediate shaft (not shown). The horizontal movement of the mounting table 6 is also stopped.

On the other hand, as shown in FIGS. 1 to 3, the collar portion 18 'of the driven side pawl clutch 18 has a front rotation blocking surface A'and a rear rotation blocking surface A'.
A notch-shaped recess 22 having B'is provided.
Is relatively inserted into the stopper 23 so that the stop position on the rotation locus L of the planting rod 7 can be regulated. In the illustrated example, the stopper 23 is a fixed stopper projecting from the wall of the drive case 14 in the direction of the axis 1, and the driven side pawl clutch 18 has a portion of the collar portion 18 'other than the concave portion 22 in which the operating lever 2 is provided.
Even if 1 is operated to the off side, the stopper 23 interferes and the clutch C
Is configured so that it cannot operate.

Although the above-mentioned configuration is substantially the same as the conventional one, the present invention is firstly such that the rear side B of the stopping range α of the planting rod 7 when the planting clutch C is disengaged is the locus of rotation of the planting rod 7. The rotation timing of the planting rod 7 when the recessed portion 22 is fitted into the stopper 23 is set so as to be located on the forward side of the apex position L _T on L.

That is, the stop position of the planting rod 7 is in the range of the recessed portion 22 of the collar portion 18 'into which the stopper 23 is fitted, in other words, the stopper 23 is in contact with the rear rotation blocking surface B'of the recessed portion 22 (FIG. 2). The stopper 23 contacts the front rotation-preventing surface A'from the pivoted position of the planting rod 7 in the illustrated state.
However, in the embodiment, the planted rod stop position (the rear side B of the planted rod stop range α) when the stopper 23 comes into contact with the rear rotation blocking surface B ′ of the recess 22 is shown. The planting rod 7 is the fourth
As shown in the figure, at the point L ₁ immediately after entering the descending stroke (previous traveling stroke) with reference to the apex position L _T on the turning locus L,
Further, the stop position of the planting rod (the front side A of the planting rod stop range α) when the stopper 23 comes into contact with the rotation preventing surface A ′ is set to the planting rod 7
So that they will come to the point L ₉ in the middle of the front, respectively.
The rotation timing of is set.

The stop position on the front side A and the stop range α of the planting rod are related to the moving stroke of the apron 24 which is moved in the front and rear direction of the seedling in order to adjust the seedling scraping amount by the planting rod 7, the clutch. The appropriate position and range are selected in consideration of various factors such as the ease of clutch operation due to the narrowness of the disengageable region and other errors in assembly processing.

Further, in the above-described embodiment, the collar portion 1 of the driven side pawl clutch 18 is
Although the notch-shaped recessed portion 22 of 8'is provided and the fixed stopper is relatively fitted into the recessed portion 22 to stop the planting rod 7, the planting rod stopping device has been described. The present invention is not limited to this, and for example, a planted rod stop device in which a cam surface is formed on a driven claw clutch and a movable stopper is projected and retracted with respect to the cam surface to open and close the clutch can also be adopted.

Now, FIG. 11 to FIG. 15 show an example in which the contact surface of the stopper 23 with respect to the rear rotation blocking surface B ′ of the concave portion 22 provided in the driven side pawl clutch 18 is configured as an inclined surface. It is a thing. That is, as shown in FIG. 11, the front side rotation-preventing surface A ′ of the driven side claw clutch concave portion 22 and the stopper 23 are in surface contact (parallel surface contact) on the front side A of the planting rod stop range α. ), The rear rotation-preventing surface B ′ of the concave portion 22 and the stopper on the rear side B of the planting rod stop range α.
23 is configured so as to come into contact with the inclined surface S as shown in FIGS. 12 to 14. The example in the figure shows the stopper 23
Side contact surface is an inclined surface S, and the inclination directions are horizontal and vertical such that the insertion start end side with respect to the stopper 23 is low and the insertion end side is high, and gradually decreases from the base portion of the stopper 23 toward the tip end side. S is an inclined surface provided on both of the above, and the stopper 23 and the rear rotation preventing surface B ′ of the drive side pawl clutch 18 are in line contact with each other.

The inclined surface S may be provided not on the stopper 23 side but on the rear rotation blocking surface B ′ of the clutch 18. Alternatively, the vertical inclination angle may be changed so that the stopper 23 and the rear side rotation blocking surface B ′ are in point contact with each other (see FIG. 15).

Next, the operation will be described. First, during the planting work, the planting clutch C is disengaged in order to stop the operation of the planting rod 7 at the time of turning of the machine body on the headland. At this time, if the planting lever 21 is operated to the cut side as shown in FIG.
Since the driven side claw clutch 18 is rotated clockwise in the figure while being elastically urged by, the driven side claw clutch 18 is pressed against the return spring 20 and moved leftward on the shaft 15. When the stopper 23 elastically contacts the collar portion 18 'of the driven side pawl clutch 18, lateral movement of the clutch 18 is temporarily blocked and the clutch 18 rotates while the brake is applied. Then, the recess 22 is a stopper.
When the clutch 18 rotates to the position corresponding to 23, the clutch
18 moves to the left against the spring 20, and the recess 22 is fitted into the stopper 23, and the planting clutch C is completely disengaged.
The planting rod 7 stops.

By the way, during the actual work, when the planting clutch C is used, it is mainly during the turning of the aircraft in the headland part, and the headland turning is performed at a reduced speed. Therefore, in the actual work state, the stopper 23 is located after the recess 22. The planting rod 7 rarely stops in the state of being in contact with the side rotation preventing surface B '(the state shown in FIG. 1), and the rear side 18'a of the flange 18 of the clutch 18 is prevented as shown in FIG. Stopper 23
In most cases, the stopper 23 comes into contact with the front surface side 23a and the brake is applied at the Z portion, and the stopper 23 comes into contact with the rear rotation blocking surface B'of the recess 22 (the state shown in FIG. 2). At this time, the rear rotation blocking surface B'of the clutch 18 and the stopper
As described above, a residual torque is generated on the contact surface of the clutch 23 in the direction opposite to the rotation direction of the clutch 18 and a residual torque is generated in the contact portion, and both are likely to be in a bite state. Since the planting rod 7 is positioned at the next point L ₁ on the forward side of the apex position L _T on the rotation locus L when it abuts on the rear rotation blocking surface B ′. When the planting clutch C is disengaged during actual work, the planting rod 7 does not stop on the reverse side (upstroke) where the resistance on the locus L is large, and the planting rod 7 is urged in the forward direction by its own weight. The clutch 18 and the stopper 23
The biting phenomenon due to the residual torque as described above does not occur on the contact surface of the. Therefore, when the planted clutch C is re-engaged, the malfunction of the clutch due to the sliding resistance (a phenomenon that the clutch is difficult to engage) is eliminated, and the clutch operation is always performed smoothly.

Further, in the case where the contact surface of the stopper 23 with respect to the rear rotation blocking surface B ′ of the concave portion 22 provided in the driven side pawl clutch 18 is configured to be the inclined surface S, when the planting clutch C is disengaged, the stopper 23 is It is similar to the above-mentioned case that the clutch C is completely disengaged by elastically contacting the collar portion 18 'while the brake is being applied to find the concave portion 22, but at this time, the stopper inclined surface S and the clutch 18 slip. While in line contact (No. 12
(Fig.) Or point contact (Fig. 15), the residual torque at that moment decreases (friction resistance decreases).

Therefore, there is no bite between the driven side pawl clutch 18 and the stopper 23, and the operation of the planting clutch is smoothly performed as described above.

EFFECTS OF THE INVENTION Since the first and second aspects of the present invention are configured as described above, the following effects are achieved respectively.

(1) The planting rod can be stopped within a range in which the weight of the planting rod always exerts momentum in the forward direction without being stopped on the backward side from the locus apex where the resistance on the locus is large.
As a result, when the planted clutch is disengaged, a strong pressing force in the pressure contact direction does not act between the rotation preventing surface of the clutch and the stopper, and the biting state due to the contact pressure (friction) between the two can be eliminated. As a result, the operation resistance at the time of re-engagement of the clutch is small and the clutch operation is smooth and good,
Since the spring pressure of the clutch return spring can be set to be as weak as possible, the operation load of the lever and the like can be reduced, and it can be used by the elderly and the like.

(2) The lower end of the seedling mount, which is the seedling scraping part of the planting rod, is in the clutch disengagement range (planting rod stop range α) in the locus of descending rotation of the planting rod.
Even if troubles such as stone blockage in the seedling scraping part occur, the planting clutch can be disengaged in that state during recovery work such as stone removal, and work can be done with the planting clutch disengaged. There are advantages.

(3) When the planted clutch is disengaged, the inclined surface causes the spring and the clutch rotation-preventing surface to come into contact with each other while sliding, so that the residual torque on the contact surface is reduced, and the reduction in bite between the clutch and the stopper can be eliminated. Can be always performed smoothly, and the spring pressure of the clutch return spring can be set as weak as possible, so that the operation load of the lever or the like can be reduced.

[Brief description of drawings]

FIGS. 1 to 3 are explanatory views of the operation of the main part. FIG. 1 is a front view of a state in which the stopper is in contact with a front side rotation preventing surface of a concave portion provided in the driven side pawl clutch, and FIG. 2 is a stopper. Fig. 3 is a front view showing the state in which the recess contacts the rear rotation prevention surface of the recess, Fig. 3 is a plan view showing the condition before and after the recess is fitted into the stopper, and Fig. 4 is a stop on the rotation locus of the planting rod. FIG. 5 is a sectional view of the planting clutch mechanism, FIG. 6 is a side view of the planting part, and FIG. 7 is a planting rod showing a conventional planting rod stop range Y. A locus diagram, FIG. 8 is an overall side view of the rice transplanter, FIG. 9 is a plan view showing a wheel up-and-down mechanism and a rolling mechanism, and FIG. 10 is a cross-sectional view of a rotation fulcrum part of a chain case and a lift arm.
11 to 15 show an example in which the contact surface of the stopper with respect to the rear rotation-preventing surface of the recess is formed as an inclined surface, and FIG. 11 shows the state where the stopper is in contact with the front-side rotation-preventing surface of the recess. FIG. 12 is a front view of the stopper in contact with the rear rotation preventing surface of the recess, FIG. 13 is a plan view showing the condition before and after the recess is fitted into the stopper, and FIG. FIG. 15 is a perspective view of the stopper, and FIG. 15 is a front view of the stopper of an example in which an inclined surface is configured such that the stopper and the rear-side rotation preventing surface make point contact. 7 ... Planting rod, 15 ... Shaft, 17 ... Drive side claw clutch, 18
...... Drive side claw clutch, 18 …… Collar part, 22 …… Recessed part, 23
...... Stopper, A '... Front rotation-prevention surface of recess, B' ...
Rear rotation blocking surface of the recess, C ... Planting clutch, S ...
Inclined surface.

Claims (3)

(57) [Claims] 1. A drive side pawl clutch (1) provided on a shaft (15).
7) and the driven side claw clutch (18) are engaged and disengaged to engage and disengage the planting clutch (C), and the rotation blocking surfaces (A '), (B') provided on the driven side claw clutch (18) when the clutch is disengaged. In the planted clutch device, a recessed portion (22) having a) is relatively inserted into the stopper (23) to restrict the stop position on the rotation locus (L) of the planting rod (7). The stop range (α) of a predetermined length of the planting rod (7) capable of disengaging the attached clutch is set on the ascending stroke side where the operating resistance of the planting rod (7) on the rotation locus (L) is large. The trailing side trajectory,
The planting rod (7) is provided on the forward side from the apex position (L _T ) which is the boundary with the forward side trajectory on the descending stroke side where the operating resistance is small, and the seedling mounting table (6) is located within the stop range (α). The planting of a transplanter characterized in that the turning timing of the planting rod (7) when the recess (22) is fitted into the stopper (23) is set so that the planted seedling scraping portion at the lower end is interposed. Rod stop device. 2. A drive side pawl clutch (1) provided on a shaft (15).
7) and the driven side claw clutch (18) are engaged and disengaged to engage and disengage the planting clutch (C), and the rotation blocking surfaces (A '), (B') provided on the driven side claw clutch (18) when the clutch is disengaged. In the planted clutch device, the recessed portion (22) having the above (4) is relatively fitted into the stopper (23) so as to regulate the stop position on the rotation locus (L) of the planted rod (7). The driven side claw clutch (18) is slid in the direction of the shaft (15) to engage and disengage with the drive side claw clutch (17), and the recess (22) is provided on the outer periphery of the driven side claw clutch (18). It is formed on the outer peripheral side of the collar portion (18 '), and between the rotation blocking surfaces (A'), (B ') at both ends of the recessed portion (22), the planting rod (7) on the rotation locus (L). Corresponding to the stop range (α),
The recessed portion with respect to the stopper (23) so that the rear side (B) of the stop range (α) of the planting rod (7) is located on the forward side of the apex position (L _T ) on the rotation locus (L) of the planting rod. A planting rod stopping device for a transplanting machine, characterized in that a turning timing of the planting rod (7) when the portion (22) is fitted is set. 3. A drive side pawl clutch (1) provided on a shaft (15).
7) and the driven side clutch pawl (18) are engaged and disengaged to engage and disengage the planting clutch (C), and the rotation blocking surfaces (A '), (B') provided on the driven side pawl clutch (18) when the clutch is disengaged. In the planted clutch device, a recessed portion (22) having a (4) is relatively fitted into the stopper (23) to restrict the stop position on the rotation locus (L) of the planted rod (7). The contact surface of the stopper (23) with respect to the rear rotation prevention surface (B ′) of the concave portion (22) provided in the side claw clutch (18) is an inclined surface (S).
A planting rod stopping device for a transplanter, which is characterized in that