JPH05328812A - Rice transplanter - Google Patents

Abstract

PURPOSE:To prevent fatigue of gear and to improve durability by preventing a planting arm from rocking backward by a cam and a gear right before the planting arm is passed through a seedling output port. CONSTITUTION:Right before a planting arm 3 is passed through a seedling output port, a gear 12 at the side of the planting gear is previously rotated by a cam arm 22 and a first protruded part 21a of a cam part 21 so that the planting arm can not be rocked backward. When the planting arm is passed through the seedling output port, gear 21 12 will not strike a gear 18 even by receiving reaction force from the seedling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a pair of planting arms at both ends of a support case which is rotationally driven on the lateral side of the planting mission case, and both planting arms are provided with rotation of the support case. Alternately take out the seedlings from the seedling take-out opening on the nose stand,
Regarding rice transplanters configured to be planted on the rice field.

[0002]

2. Description of the Related Art In the case of a rice transplanter having a pair of planting arms in a support case that is rotationally driven as described above, a structure for determining the posture of the planting arms with respect to the support case is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-160415. There is a structure as disclosed in. In this structure, a support case (2 in FIG. 5 of the publication) is attached to a drive shaft (7 in FIG. 5 of the publication) that laterally protrudes from the planted mission case (1 in FIG. 5 of the publication) and is rotationally driven. ) Is fixed, and the first gear (9 in FIG. 5 of the above publication) is arranged in a fixed state at the center of rotation in the support case with respect to the planted mission case. A pair of planting arms (3 in FIG. 5 of the above publication) are provided at both ends of the support case.
In a support case between a first gear and a second gear (12 in FIG. 5 of the publication) fixed to a support shaft (10 in FIG. 5 of the publication) for supporting the planting arm. , A third gear that meshes with the first and second gears (17 in FIG. 5 of the above publication,
18) is arranged and the first, second, and
The posture of both planting arms with respect to the support case is determined by the gear engagement of the three gears.

When the planting arm passes through the seedling take-out port of the seedling stand and takes out the seedling, the planting arm receives a reaction force from the seedling. On the other hand, the gear in the support case, which determines the posture of the planting arm, is provided with a certain amount of backlash at its occlusal portion in order to smooth the occlusion. As a result, when the planting arm passes through the seedling take-out port, the reaction force from the seedling causes the planting arm to slightly swing backward by the amount of backlash play, and the gear teeth of the gear mechanism in the support case collide. The phenomenon occurs. Then, this collision phenomenon is repeatedly generated by the rotation of the support case.

Therefore, in the above-mentioned Japanese Patent Laid-Open No. 1-160415, as shown in FIGS. 1 and 2 of this publication, immediately before the planting arm passes through the seedling take-out port,
The cam arm (22 in FIG. 1 of the publication) pushes the cam portion (21a of FIG. 1 of the publication) of the support shaft on the side of the planting arm to operate the second gear of the support shaft (FIG. 1 and FIG. Two
12) to the third gear (1 in FIG. 1 and FIG. 2 of the publication).
It is rotated ahead of 8). In this way, by changing the position of the backlash (G in FIG. 2 of the above publication) and swinging the planting arm in advance by the amount of play of the backlash, the planting arm causes the seedling take-out port to move. The occurrence of collision between gear teeth when passing is suppressed.

[0005]

In the structure of the above publication, when the planting arm passes through the seedling take-out port, the backlash play disappears. Once it has passed, it returns to the state where backlash play has occurred against the planting arm. Therefore,
When this planting arm plunges into the paddy field and planted seedlings, the planting arm slightly swings backward due to the backlash play due to the reaction force from the paddy field, and the gear teeth in the support case A collision phenomenon will occur. This collision phenomenon also occurs repeatedly due to the rotation of the support case.
The present invention, in the rice transplanter equipped with a pair of planting arms in the support case that is rotationally driven as described above, while preventing the collision phenomenon of the gear teeth when the planting arm passes through the seedling take-out port, At the same time, the purpose is to make it possible to reduce the collision phenomenon between gear teeth when the planting arm plunges into the rice field and plants seedlings.

[0006]

As described above, the features of the present invention are as follows. The support case is fixed to the drive shaft that laterally protrudes from the planted mission case and is rotationally driven. The first gear is arranged in a fixed state with respect to the planting mission case, a pair of planting arms are provided at both ends of the support case, and a second gear fixed to a support shaft that supports the planting arm; In the support case between 1 gear,
A third gear that meshes with the first and second gears is arranged, and the gear engagement of the first, second, and third gears with the rotation of the support case determines the postures of both planting arms with respect to the support case, The rice planting machine is configured so that the two planting arms alternately take out the seedlings from the seedling take-out port of the seedling stand and plant them on the rice field, as follows.
In other words, a cam arm is provided along the circumferential direction on the support shafts of both planting arms, and a cam arm whose tip is urged toward the contact pressing side with the outer peripheral surface of the cam part by a spring is provided in the support case, Immediately before the planting arm passes through the seedling take-out port, the cam arm presses and pushes the second arm of the support shaft to rotate the first gear with respect to the third gear. In addition, a second convex portion is provided on the outer peripheral surface of the cam portion, which immediately starts to give a resistance to the rotation of the support shaft by being pressed by the cam arm immediately before the planting arm plunges into the rice field. There is.

[0007]

With the construction of the present invention, as shown in FIGS. 5 and 6, for example, as the support case 2 rotates, the third gear 18 on the support case 2 side causes the second gear 1 on the planting arm 3 side.
2 is driven and the posture of the planting arm 3 is determined. As a result, in the state shown in FIGS. 5 and 6, the planting arm 3 is in a state in which it can swing rearward (clockwise in the drawing) by the amount of the backlash G. In this state, when the planting arm 3 receives a reaction force from the seedling while passing through the seedling take-out port, the planting arm 3 swings backward and the gear teeth of the second gear 12 become the gear teeth of the third gear 18. Clash with. Therefore, just before the planting arm 3 passes through the seedling take-out opening as in the present invention, the cam arm 22 and the first convex portion 21a of the cam portion 21
When the second gear 12 on the side of the planting arm 3 is rotated in advance, the position of the backlash G is reversed as shown in FIGS. 3 and 4, and the planting arm 3 is further moved backward (clockwise in the drawing). It becomes impossible to swing. Accordingly, even if the planting arm 3 receives a reaction force from the seedling when the planting arm 3 passes through the seedling take-out opening in this state, the phenomenon that the gear teeth collide with each other does not occur.

Then, when the support case 2 is further rotated after the planting arm 3 passes through the seedling take-out opening and takes out the seedlings, the preceding rotation action by the cam arm 22 and the first convex portion 21a disappears. As shown in FIG. 6, the second gear 12 is rotationally driven by the third gear 18,
A backlash G as shown in FIG. 6 occurs between the second gear 12 and the third gear 18. Then, as shown in FIG. 7, when the support case 2 is rotated until just before the planting arm 3 plunges into the rice field, the second convex portion 21b of the cam portion 21 is pressed against the tip of the cam arm 22, and the cam arm 22 is moved. Two
As it rides on the outer peripheral surface of 1, the resistance is applied to the rotation of the planting arm 3 and the cam portion 21 in the clockwise direction of the drawing. Therefore, in this state, the planting arm 3 starts to plunge into the rice field, and the reaction force causes the planting arm 3 and the cam portion 21 to move.
Is rotated in the clockwise direction on the paper surface, the resistance effect of the second convex portion 21b of the cam portion 21 and the cam arm 22 prevents the planting arm 3 and the cam portion 21 from rotating in the clockwise direction on the paper surface. Resistance. As a result, the second gear 12 on the side of the planting arm 3 in the state shown in FIGS.
It rotates clockwise in the plane of the drawing, and the gear teeth of the second gear 12 move to the third position.
Even if the rear surface of the gear teeth of the gear 18 (the surface on the left side of the paper surface of FIG. 8) collides, this collision is mitigated by the resistance action of the second convex portion 21b and the cam arm 22 described above. is there.

Next, regarding the change of the transmission torque applied to the support shaft of the planting arm, the case where the cam portion 21 and the cam arm 22 of the present invention shown in FIG. 3 are equipped, and the cam portion and the cam arm of the present invention are provided at all. The case where there is no case will be described. When the cam portion and the cam arm of the present invention are not provided at all, the transmission torque applied to the support shaft of one planting arm is as shown by the solid line B in FIG. That is, when the planting arm passes through the seedling take-out opening and takes out the seedling, the support shaft of the planting arm is rotated by the amount of backlash play due to the reaction force from the seedling. At this moment, the driving action of the support shaft on the second gear disappears from the third gear, so that the transmission torque applied to the support shaft sharply decreases (time B1), and then the gear teeth of the second gear and the third gear collide with each other. The transmission torque suddenly rises at the moment (time point B2). Next, when the planting arm plunges into the rice field, the support shaft of the planting arm is rotated by the amount of backlash play due to the reaction force from the rice field. At this moment, the driving action of the support shaft on the second gear disappears from the third gear, so that the transmission torque applied to the support shaft sharply decreases (time point B3), and then the gear teeth of the second gear and the third gear collide with each other. The transmission torque suddenly rises at the moment when
4). After that, the cycle shown by the solid line B in FIG. 9 is repeated.

On the other hand, when the cam portion 21 and the cam arm 22 of the present invention shown in FIG. 3 are equipped, the transmission torque applied to the support shaft of one planting arm is as shown by the solid line A in FIG. Become. That is, when the planting arm passes through the seedling take-out port and takes out the seedling, the support shaft of the planting arm is rotated by the preceding rotation action of the cam arm and the first convex portion of the cam portion. At the moment of this preceding rotation, the third
Since the driving action on the second gear of the support shaft disappears from the gear, the transmission torque applied to the support shaft sharply decreases (time A
1). Next, when the planting arm passes through the seedling take-out port and the reaction force from the seedling is applied from the second gear to the third gear, the transmission torque increases (time point A2). In this case, as shown in FIGS. 3 and 2, the backlash G is turned off in advance, and the collision phenomenon between the gear teeth is suppressed, so that the transmission torque at the time point A2 also rises. It is small. Next, when the planting arm plunges into the rice field, the support shaft of the planting arm is rotated by the amount of backlash play due to the reaction force from the rice field. In this case, the resistance of the cam arm and the second convex portion of the cam portion with respect to the rotation of the support shaft of the planting arm suppresses a rapid decrease in the transmission torque (time A4). Then, at the moment when the gear teeth of the second gear and the gear teeth of the third gear collide with each other, the transmission torque sharply rises, but as described above, the collision is mitigated by the resistance action of the cam arm and the second convex portion of the cam portion. Because
The increase in transmission torque at time A4 is also small. After that, the cycle shown by the solid line A in FIG. 9 is repeated. As described above, by providing the cam arm and the cam portion of the present invention, the change in the transmission torque applied to the support shaft of the planting arm can be reduced over the entire planting cycle as shown by the solid line A in FIG. The number is limited (especially both when passing through the seedling take-out port and when entering the rice field).

[0011]

EFFECTS OF THE INVENTION In a rice transplanter equipped with a pair of planting arms in a support case that is rotated as described above, when the planting arms pass through the seedling take-out port and when the planting arms plunge into the rice field, the seedlings are planted. It is now possible to prevent and suppress the collision phenomenon between gear teeth when both are planted, and it is possible to prevent fatigue due to repeated collision phenomena and improve durability. It was The change in the transmission torque applied to the support shaft of the planting arm can be suppressed to a small value as a whole, and the durability can be further improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the horizontal axis P1 of the rear part of the planted mission case 1 (corresponding to the center of rotation of the support case 2)
A supporting case 2 is rotatably supported around the supporting case 2, and a pair of planting arms 3 are provided at both ends of the supporting case 2, and the pair of planting arms 3 are attached to the seedling stand as the supporting case 2 rotates. The seedling planting device is configured such that the seedlings are alternately taken out from the seedling take-out port 4a of No. 4 and planted on the rice field. A float 5 for leveling and maintaining posture is provided under the planting mission case 1, and these seedling planting devices can be raised and lowered by a traveling machine body (not shown) via a link mechanism (not shown). It is connected.

Next, the structure of the support case 2 will be described. As shown in FIGS. 2 and 1, the drive shaft 7 projects from the planted mission case 1 to the left and right, and the support case 2 is fixed to the drive shaft 7. A cylindrical fixed shaft 8 fixed to the planted mission case 1 is fitted onto the drive shaft 7 and projects into the support case 2. In the support case 2, the first gear 9 is attached to the fixed shaft 8. It is connected.

A planting arm 3 is rotatably supported at both ends of the support case 2, and a second gear 12 is fixed to a cylindrical support shaft 10 thereof. Further, between the first gear 9 and the second gear 12, a pair of third gears 17 and 18 are concentrically connected to each other and supported by the intermediate shaft 11,
The gear 17 meshes with the first gear 9, and the third gear 18 is the second gear.
It meshes with the gear 12. And. Each of the first, second, third gears 9, 12, 17, and 18 is formed as a non-circular gear, and constitutes a gear mechanism that determines the posture of the planting arm 3 during rotation of the support case 2.

Next, the structure near the mounting portion of the planting arm 3 will be described. As shown in FIGS. 2 and 1, the support shaft 10
Is cylindrical and is supported by the support case 2 via a bearing, the cam shaft 13 from the planting arm 3 passes through the support shaft 10, and the ring member 16 causes the tip of the cam shaft 13 to move to the support case 2. It is in a fixed state. And
A cam mechanism 19 is configured between the cam shaft 13 and the seedling pushing tool 3a in the planting arm 3, and when the planting arm 3 passes through the seedling take-out port 4a, the seedling pushing tool 3a is pushed by the planting arm 3. When the planting arm 3 plunges into the paddy field, the seedling pushing-out tool 3a projects and pushes the seedlings to the paddy field, so that the seedling pushing tool 3a and the planting claws 3b hold the seedlings. It is configured to put out. Also, the planting arm 3 has a pin 14
It is fixed to the support shaft 10 by means of a key 15 and the pin 14 can be removed so that the planting arm 3 and the cam shaft 13 can be integrally removed from the support case 2.

Next, the second gear 12 in the planting arm 3
The structure for eliminating the play of the backlash G between the third gear 18 and the third gear 18 and the change in the transmission torque applied to the support shaft 10 of the planting arm 3 will be described. In the state where the planting arm 3 has finished planting seedlings on the rice field and is rotating around the rear side, a backlash as shown in FIG. 6 is provided between the second gear 12 and the third gear 18 of the support shaft 10. G is occurring. This is because the rotation of the support case 2 causes the third gear 17 to rotate around the fixed first gear 9 while engaging with each other, and the second gear 12 is rotationally driven by the third gear 18.

As shown in FIGS. 2 and 3, in the support shaft 10, a portion (a boss portion of the second gear 12) facing the third gear 17 extends from the first convex portion 21a along the circumferential direction. A cam portion 21 formed in series up to the second convex portion 21b is fixed, the cam arm 22 is swingably supported around the horizontal axis P2 of the support case 2, and the tip of the cam arm 22 is cammed by a spring 23. It is designed to be pressed against the portion 21 side. This structure is provided in both of the pair of planting arms 3.

With the above structure, as shown in FIGS. 3 and 4, when the support case 2 rotates counterclockwise on the paper until the planting arm 3 comes immediately before the upper seedling take-out port 4a, the cam arm 22 causes the cam portion to move. The first convex portion 21a of the vehicle 21 is climbed up and the first convex portion 21a is pushed. In such a state, the urging force of the spring 23 causes the cam portion 21, the support shaft 10, the planting arm 3, and the like to rotate in advance of the third gear 18, that is, to rotate clockwise in FIG.

As a result, the gear teeth of the second gear 12 on the side of the planting arm 3 come into contact with the gear teeth of the third gear 18 from the rear as shown in FIG. Rush G will occur. Therefore, when the planting arm 3 passes through the seedling take-out opening 4a in the state shown in FIGS. 3 and 4, even if the gear teeth collide with each other even if they are rotated clockwise due to a reaction force from the seedlings. There is no matching phenomenon.

The change in transmission torque applied to the support shaft 10 of the planting arm 3 is shown by the solid line A in FIG. In this case, as shown in FIG.
When the gear 12 is rotated in advance, at this moment, the support shaft 1
When the transmission torque applied to 0 suddenly decreases (time A1), and then the planting arm 3 passes through the seedling take-out port 4a and receives a reaction force from the seedling, the transmission torque increases at that moment (time A).
2). In this case, as shown in FIGS. 3 and 4, the backlash G is turned off in advance, and the collision phenomenon between the gear teeth is suppressed, so that the transmission torque at the time point A2 also increases. It is small. When the reaction force from the seedling disappears, the transmission torque returns to a steady state (time point A3).

When the support case 2 further rotates after the planting arm 3 has passed through the seedling take-out port 4a and taken out the seedlings as described above, the preceding rotation action of the cam arm 22 and the first convex portion 21a disappears. As shown in FIGS. 5 and 6, the second gear 12 is rotationally driven by the third gear 18, and the backlash G as shown in FIG. 6 is present between the second gear 12 and the third gear 18. Occurs.

In this state, when the support case 2 is rotated just before the planting arm 3 plunges into the rice field, the second convex portion 21b of the cam portion 21 reaches the tip of the cam arm 22 as shown in FIG. It's spinning. Therefore, when the planting arm 3 plunges into the rice field in the state of FIG. 7 and the planting arm 3 and the cam portion 21 are intended to be rotated clockwise in the drawing by the reaction force thereof, 21b is pressed by the tip of the cam arm 22, and resistance is applied to the rotation of the planting arm 3 and the cam portion 21 in the clockwise direction of the drawing.

As a result, in the state shown in FIGS. 7 and 8, the second gear 12 on the side of the planting arm 3 rotates clockwise in the drawing, and the gear teeth of the second gear 12 become the gear teeth of the third gear 18. Even if the rear surface (the surface on the left side of the paper in FIG. 8) collides, the collision is mitigated by the resistance action of the second convex portion 21b and the cam arm 22 described above. In this way, when the planting arm 3 plunges into the rice field, the transmission torque applied to the support shaft 10 drops sharply and rises again, but the second convex portion 21b and the cam arm as shown in FIG. Since the rotation of the support shaft 10 is resisted by the resistance action with 22, the transmission torque does not drop sharply. Then, since the collision of the gear teeth is alleviated by the above-mentioned resistance action, the increase of the transmission torque at the time point A4 is also small.

Then, from the state shown in FIG.
When the counter shaft rotates counterclockwise on the paper surface, the support shaft 10 with the tip of the cam arm 22 riding on the outer peripheral surface of the cam portion 21
Will rotate. As a result, the rotation of the support shaft 10 is resisted by the friction between the tip of the cam arm 22 and the outer peripheral surface of the cam portion 21, so that the transmission torque applied to the support shaft 10 becomes slightly higher as at time A5. After that, when the planting arm 3 reaches immediately before the seedling take-out port 4a and returns to the state of FIG. 3, the transmission torque applied to the support shaft 10 suddenly decreases due to the action of the cam arm 22, and thereafter this cycle is repeated. go.

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 configuration of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Overall side view of the seedling planting device

FIG. 2 is a cross-sectional plan view of a support case and a planting arm.

FIG. 3 is a vertical sectional side view of the support case with the planting arm reaching just before the seedling take-out opening.

FIG. 4 is a side view showing an engagement state between the second gear on the side of the implanting arm and the third gear on the side of the supporting case in the state shown in FIG.

FIG. 5 is a vertical cross-sectional side view of the support case with the planting arm rotated from the state shown in FIG. 3 to the rice field side.

6 is a side view showing an engagement state between the second gear on the side of the implanting arm and the third gear on the side of the support case in the state shown in FIG.

FIG. 7 is a vertical sectional side view of the support case in a state in which the planting arm reaches just before entering the rice field.

8 is a side view showing an engagement state between the second gear on the side of the planting arm and the third gear on the side of the support case in the state shown in FIG. 7.

FIG. 9 is a diagram showing changes in transmission torque applied to a support shaft of a planting arm.

[Explanation of symbols]

 1 mission case with plant 2 support case 3 arm with plant 4 seedling stand 4a seedling take-out port 7 drive shaft 9 first gear 10 support shaft 12 second gear 17, 18 third gear 21 cam part 21a first convex of cam part Part 21b second convex part of cam part 22 cam arm 23 spring P1 rotation center part

Claims (1)

[Claims] 1. A support case (2) is fixed to a drive shaft (7) which laterally projects from the planted mission case (1) and is driven to rotate, and a rotation center portion (P1) in the support case (2). ) In which the first gear (9) is fixed to the planted mission case (1), and a pair of planting arms (3) are provided at both ends of the support case (2). The first and second gears are provided in a support case (2) between a second gear (12) fixed to a support shaft (10) supporting an arm (3) and the first gear (9). (9), (1
The third gears (17) and (18) which are engaged with the second case are arranged so that the first, second and
The postures of the two planting arms (3) with respect to the support case (2) are determined by the gear meshing of the three gears (9), (12), (17), (18), and the two planting arms (3). ) Is a rice transplanter configured to alternately take out the seedlings from the seedling take-out port (4a) of the seedling stand (4) and plant the seedlings in the rice field, the support of the both planting arms (3) A cam arm (22) provided with a cam portion (21) extending along the circumferential direction on the shaft (10), the tip of which is urged by a spring (23) to contact and press the outer peripheral surface of the cam portion (21). , The planting arm (3) is provided in the support case (2) and the seedling take-out port (4) is provided.
Immediately before passing through a), the cam arm (22)
The support shaft (10) is operated by pushing and pressing by the
Is provided on the outer peripheral surface of the cam portion (21) with the first convex portion (21a) for precedingly rotating the second gear (12) with respect to the third gear (18), and the planting arm (3) is Immediately before entering the rice field, the cam arm (22) presses and pushes the cam arm (22) so that the second protrusion (21b) starts to give resistance to the rotation of the support shaft (10). ) Is a rice transplanter equipped on the outer peripheral surface.