JPS5941931Y2 - Structure of the drive section of the rice transplanter's seedling planting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure of a drive unit for a seedling planting device of a rice transplanter, which is equipped with a transmission and a fixed position stop clutch.

Because rice transplanters are used on soft ground, it is desirable to make them as compact and lightweight as possible. Conventionally, the transmission was a gear type, which caused the problem that the transmission itself was heavy and large. However, in order to meet the above requirements, it is necessary to improve this problem.

In view of these circumstances, the present invention makes the transmission device lightweight and compact, and furthermore, has a simple structure to prevent damage to the transmission device, facilitate switching operations, and prevent damage to the clutch. The purpose is to

Next, embodiments of the present invention will be described based on illustrative drawings.

The walking rice transplanter is constructed as shown in FIG.

That is, a driving unit 4 is constituted by an engine 1 and a transmission case 3 which is interlocked with the engine 1 VC via a belt tension clutch 2 that can change the transmission speed between high and low speeds. A pair of left and right seedling planting devices 7, 7 for driving and swinging the attachment arm 6 to cause the planting claw 5 to move up and down along a fixed rotation trajectory;
and a seedling planting section from an inclined seedling platform 8 that is reciprocated from side to side in accordance with the movement of the seedling planting device 7.7 with the seedling take-out opening facing the rotation locus of the seedling planting claws 5, 5. 9, and has a front end connected to the transmission case 3, a middle part connected to the seedling planting device 7.7, and a rear end connected to the seedling stand 8. , a mechanism 11 that connects the driving unit 4 and the seedling planting unit 9 and transmits the output from the mission to the seedling planting unit 9;
This is provided.

A pair of left and right transmission cases 12 are connected to the transmission case 3.
, 12 are installed so as to be vertically swingable, and running wheels 13 and 13 are mounted on the free end sides of both transmission cases 12 and 12, respectively, and a control knob 14 is mounted from the rear end of the frame 10.
(F) A front float 15 is attached to the driving section 4, and a similar pair of left and right rear floats 16.16 are attached to the seedling planting section 9. It is.

With this, the wheels 13.13 are brought into contact with the hard disk, and
As the aircraft travels with the aircraft supported at a predetermined height above the ground through the cooperation of all the floats 15, 16, and 16, both seedling planting devices 7.7 take out and remove the seedlings from the seedling platform 8. The seedlings are planted in the area leveled by the front float 15.

The transmission mechanism 11 is constructed as shown in FIG.

That is, the connection frame 10 is configured to be hollow,
The output shaft 17 from the mission case 3 projects into the frame 10, and both planting arms 6.6
A rotating shaft 18 for driving the seedling stand 8Vc is passed through the frame 10, and a rotating shaft 21 for driving a mechanism 20 for sliding the spiral shaft 19 connected to the seedling stand 8Vc is mounted within the frame 10. The output shaft 17 and the planting arm drive shaft 18 are interlocked and connected by a first chain 22 passing through the frame 10, and the planting arm drive shaft 18 and the helical slide drive shaft 21 are connected to the frame 10. They are interlocked and connected by a second chain 23 passing through the inside.

The seedling planting part side portion of the frame 10 is split into two parts, and a tightener 24 that applies tension to the second chain 23 is provided in two directions of the split frame 10, as shown in FIG. It is attached.

In configuring the helical shaft moving mechanism 20, the drive shaft 21
A driving rotary body 25 is provided which rotates integrally with the helical shaft 1, and a driven rotary body 26 is connected to the rotary body 25rc.
9 is provided so that the helical shaft 19 slides due to relative movement between the helical shaft 19 and the engaging portion 27 as the driven rotary body 26 rotates; A gear transmission mechanism is provided between the driving rotary body 25 and the driven rotary body 26, and the transmission speed can be changed to two high and low stages.
By switching, the amount of slide movement of the helical shaft 19 per one stroke of the seedling planting devices 7, 7 is changed, thereby changing the seedling picking width of the planting devices 7, 7, that is, the amount of seedlings taken.

A transmission 28 is provided in the middle of transmission from the output shaft 17 to both seedling planting devices 7.7, and by changing the transmission device 28, the rotational speed of the planting device 7.7 relative to the machine body advancing speed is changed, and the machine body front and back is changed. Seedlings are planted in different directions at different intervals, and the transmission device 28 is constructed as shown in FIG.

That is, a sprocket group A consisting of three sprockets 29 . In addition, the clutch 31
The sprocket group and the arm drive shaft 18 are interlocked and connected via the sprocket group.

The sprocket group A is configured to be slidable in the axial direction of the arm drive shaft 18, and a coil spring 32 that presses and urges the sprocket group A toward the clutch 31 is connected to the rotating body 30 and the wall of the frame 10. There is an interposition in between.

3 of the first chain 22 (F) sprocket 29.
A derailleur 33 is provided in the frame 10 to change the winding position for the derailleur 3.
A derailleur operation tool 34 is provided outside the frame 10 for swinging the derailleur 3 around the axis X and displacing the derailleur in the direction of the axis.

Then, the derailleur 33 is operated by a manual operation combining rotation and pushing and pulling of the operating tool 34, and the first chain 22 is selectively wound around three sprockets 29. Thereby, the drive speed of the planting arm drive shaft 18 is changed by five combs.

According to the transmission 28 configuration, the first chain 22
If a problem occurs in the engagement between the chain 22 and the sprocket 29 while changing the engagement with the sprocket 29..., the sprocket group may be damaged due to the operating force generated due to the previous problem. A is slid against the pressing force of the spring 32, and the above-mentioned problem is solved.

The clutch 31 is constructed as shown in FIGS. 4 and 5.

That is, a clutch operating movable member 35 is provided which is spline-fitted to the arm drive shaft 18 so as to be slidable in the axial direction thereof, and the movable member 35 and the sprocket group rotating body 30 can be freely engaged and disengaged. A claw clutch 36 is provided, and a coil spring 37 is further provided that presses and biases the movable member 35 in the direction of engaging the claw clutch 36.

A swing lever 4 is provided with a fork 38 for slidingly operating the movable member 35, and is operatively connected to the fork 38 via a fork operating arm 39 and a wire 40.
1 is attached to the handle portion, and thereby the lever 4
When the movable member 35 is engaged with the sprocket group A via the pawl clutch 36 by the swinging operation of the fork 38 according to No. 1, the arm drive shaft 18rC is transmitted from the rotating body 30 to a position corresponding to disengaging the pawl clutch 36. When the movable member 35 is separated from the sprocket group A, the transmission force is renewed.

Furthermore, a cam body 42 that rotates integrally with the movable member 35 is provided, and a fixed protrusion 44 that engages and disengages from the notch 43 of the cam body 42 is provided extending from the frame 10, so that the planting device 7. It includes a cam mechanism for regulating the position at which it can be stopped.

That is, when the notch 43 and the protrusion 44 are opposed to each other, the planting claws 5, 5 are at the top position of their vertical movement loci, and only then is the movable member 35 separated from the sprocket group A. This makes it possible to perform operations such as

In other words, to stop the planting device 7.7, the lever 41 is operated in the clutch disengagement direction.
Only when the cam body notch 43 and the protrusion 44 face each other, the movable member 35 can be separated from the sprocket group A, and the tips of the planting claws 5, 5 are positioned at the top of their vertical movement locus. Planting device 7 only in fixed position
．． 7 is supposed to stop.

According to the clutch configuration, the notch 43 and the protrusion 4
If a malfunction occurs in which the pawl clutch 36rC repeatedly engages and disengages due to a failure in engaging and disengaging with the spring 32, the sprocket group A resists the pressing force of the spring 32 due to the operating force generated due to the malfunction. direction (displacement) away from the clutch operating movable member 35, and the above-mentioned problem is resolved.

In summary, the present invention has the above-mentioned structure of the seedling planting device drive unit of the rice transplanter, in which the transmission device is configured to selectively wind a chain around a plurality of missing sprockets having different numbers of teeth. In the fixed position stop clutch, the operating movable member is configured to engage and separate from the sprocket group, and the sprocket group is displaced in a direction away from the operating movable member against the pressing force of a spring. It is characterized by its structure.

That is, by making the transmission device selectively wind the chain around a plurality of sprockets, the transmission itself can be made lighter and more compact than the conventional gear type.

Furthermore, by making it possible to move the sprocket group away from the movable member against a spring that presses it toward a predetermined position, that is, toward the movable member for clutch operation, the gear shifting operation can be performed as described in the embodiment. If a problem occurs in the engagement between the sprocket and the chain, the resulting operating force will cause the sprocket group to displace as described above, and the stress acting on the sprocket and chain in the direction of damaging them will be eliminated. At the same time, a sprocket position that facilitates chain winding can be obtained, and
If the clutch fails to engage or disengage, the operating force generated due to repeated engagement and disengagement of the clutch member will cause the sprocket group to displace as described above, causing damage to the clutch member. The repeated engagement and disengagement described above is eliminated.

In addition, the sprocket group also serves as a clutch member that engages and separates the movable member for clutch operation, and also serves as a spring for solving problems in the transmission and a spring for solving problems in the clutch. Although it is possible to achieve the simplification of

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the structure of the drive section of the seedling planting device of the rice transplanter according to the present invention, and FIG. 1 is an overall side view of the walking rice transplanter, FIG. 2 is a schematic diagram of the transmission mechanism, and FIG. 3 is a schematic diagram of the transmission mechanism. 4 is a sectional view of the main part, and FIG. 5 is a perspective view of the main part. 22...Chain, 28...Transmission device, 29...Sprocket, 31...Clutch, 32...Spring, 35...・・・
・Movable member, A...Sprocket group.

Claims (1)

[Scope of utility model registration request] A structure of a drive unit for a seeding device for a rice transplanter, which is provided with a transmission 28 and a fixed position stop clutch 31, wherein the transmission 28
, a plurality of sprockets 29 with different numbers of teeth...
- The chain 22 is selectively wound around the fixed position clutch 31, and the operating movable member 3
5 is configured to engage and separate from the sprocket group A, and the sprocket group A is configured to be displaced in a direction away from the operating movable member 35 against the pressing force of the spring 32. A structure of a drive part of a seedling planting device of a rice transplanter, which is characterized by: