JPH0365123B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention connects a transmission case located at the front of the machine and a multi-row seedling planting device located at the rear of the machine by a pair of left and right hollow frames. Regarding a walking rice transplanter.

[Conventional technology]

In the above configuration, as shown in FIG.
This type is often seen in single-wheeled walk-behind rice transplanters in which one propulsion wheel 6 is provided between the left and right frames 4a and 4b that connect the seedling planting device 3 and the transmission case 2 that receives power from the left and right hollow frames. 4
At least one of a and 4b is mission case 2
It is also used as a power transmission case from the seedling planting device 3 to the seedling planting device 3.

The power transmission forms in this case are a, b, and c in the same figure.
Three types of configurations are being considered:

In the form a, only one frame 4a is used as a power transmission case from the mission case 2 to the planting transmission case 80 provided in the seedling planting device 3, and in the forms b and c, only one frame 4a is used as a power transmission case for the transmission case 80 provided in the seedling planting device 3. Two branched power systems, left and right, branched from 2 are guided to the seedling planting device 3 through the left and right frames 4a and 4b, and each branched power is used to drive the plurality of planting claws 10a and 10b, and one branched power or both It is configured so that the horizontal feed screw shaft 57 of the seedling stand 9 is driven by branched power.

[Problem that the invention seeks to solve]

However, the configuration shown in FIG. 8a requires a dedicated planting transmission case 80 for the seedling planting device 3, which increases the weight of the entire seedling planting device 3 and tends to increase costs. Since the transmission system is housed only in the frame 4a, there is a drawback that the left and right weight balance of the transmission mechanism is lost.

Furthermore, the configuration shown in FIG. 8b is light and easy to manufacture at low cost because the dedicated planting transmission case 80 described above is omitted, and because it has left and right branch transmission, it is possible to maintain the left and right weight balance by the transmission mechanism. It has the advantage of being less prone to collapse, but on the other hand, the branch transmission system on one side drives only the planting claw 10b, while the other branch transmission system drives the planting claw 10a and the screw shaft 57. As a result, a large difference occurs in the load between the two branch transmission systems, and a difference occurs in the progress of wear between the two branch transmission systems, resulting in a shift in the drive timing of the left and right planting claws 10a and 10b, and a rattling of the left and right branch transmission systems. There was a problem where mechanical vibrations increased due to the difference.

On the other hand, the configuration shown in FIG. , it became necessary to provide two sets of screw shaft driving means 81 overlappingly on the left and right sides, and the weight reduction and cost reduction effect by omitting the planting transmission case 80 was halved.

This invention has been made with attention to this point, and by adding an auxiliary mechanism to properly perform seedling planting work and rationally driving this auxiliary mechanism, the above-mentioned It was an attempt to eliminate the problems of the past.

[Means for solving problems]

In order to achieve the above object, in the present invention, a mission case located at the front of the machine and a seedling planting device located at the rear of the machine are connected by a pair of left and right hollow frames, and the seedlings are removed from the mission case. The generated power is branched into two systems, and each branched power is guided to the seedling planting device through the two frames, and one branched power drives the horizontal feeding screw shaft of the planting claw and seedling stand, and the other The branched power is configured to drive other planting claws and an arm for bringing soil to the planted seedlings.

[Effect]

According to the above configuration, the loads of the planting cooling and seedling board traversing mechanisms act on one branch transmission system branched out from the transmission case, and the loads of the planting claws and the earth-harvesting arm act on the other branch transmission system. As a result, the loads on both branch transmission systems are approximately balanced.

〔Effect of the invention〕

Therefore, according to the present invention, there is no large difference in the progress of wear between the left and right branch transmission systems, and there is no difference in the operation timing of the planting pawls driven by each transmission system and the difference in play between the two transmission systems. The occurrence of mechanical vibrations caused by this is also reduced.

Moreover, in order to balance the load on the left and right branch transmission system, the drive structure of the earth-harvesting arm, which is an auxiliary mechanism for improving the planting condition, is rationally utilized, so the structure shown in Figure 8c. There is no need to introduce redundant structures as seen in the above design, and the load can be balanced using the minimum number of structures, making it possible to achieve load-balanced power transmission while reducing the weight and cost of the seedling planting device. Now I can do it.

〔Example〕

FIG. 1 shows a schematic plan view of the entire walk-behind rice transplanter according to the present invention, and FIG. 2 shows a side view of the entire walk-behind rice transplanter.

This rice transplanter runs on one wheel, and is equipped with an engine 1 and a transmission case 2 directly connected to the engine 1 at the front of the machine, and a seedling planting device 3 for planting two rows at the rear of the machine. The mission case 2 and the seedling planting device 3 are connected by a pair of left and right pipe frames 4a, 4b to form a machine body, and the mission case 2 is equipped with a hydraulically adjustable swinging mechanism about a fulcrum P. A transmission case 5 is attached, a single propulsion wheel 6 pivoted to the rear end of the transmission case 5 is arranged vertically adjustable between the left and right frames 4a and 4b, and this propulsion wheel 6 is grounded on the tiller G. A pair of left and right floats 7, 7 provided at the bottom of the seedling planting device 3
The machine body is supported horizontally in the front, back, left, and right by floating on the field surface T, and the transmission case 5 is moved up and down with the hydraulic cylinder 8 according to the unevenness of the tiller G, so that the height of the machine body with respect to the field surface T and It is designed to run while maintaining a stable posture.

The seedling planting device 3 has a pair of left and right planting claws 10a on a seedling platform 9 that places and supports two rows of pine seedlings A and moves back and forth horizontally with a constant stroke corresponding to the width of the pine seedlings. , 10b are driven so as to circulate in a constant trajectory S extending between the lower end of the seedling table 9 and the field surface T, and each seedling a is cut out from the lower end of the pine row seedling A and placed on the float 7, The structure is such that two rows are planted each on the rice field T leveled in step 7.

FIG. 3 shows the transmission structure of the traveling system.

The engine 1 is directly connected to the upper end protrusion 2a of the transmission case 2, and an intermediate transmission shaft 13 is supported on which two-stage gears 12a and 12b that mesh with the engine output gear 11 are mounted. On the lower transmission side of the intermediate transmission shaft 13, there are a first transmission shaft 14 and a second transmission shaft.
A transmission shaft 15 and a traveling transmission shaft 16 having an output section to the wheel transmission case 5 are supported. An input gear 17 that constantly meshes with the large diameter gear 12a of the two-stage gear is fitted on one end of the first transmission shaft 14, and a low-speed transmission gear 19 for a transmission 18, which will be described later, is fitted on the other end. A high-speed transmission gear 20 is loosely fitted. Further, a clutch sleeve 21 which can be selectively engaged with both transmission gears 19 and 20 by left and right shifting is externally fitted on the first transmission shaft 14 with a spline while being positioned between both transmission gears 19 and 20. It has been done. A shift fork shaft 22 for the clutch sleeve 21 is slidably protruded outside the transmission case 2, and the clutch sleeve 21
The shift fork shaft 22 is urged by a spring 23 toward the outside of the transmission case so that the shift fork shaft 22 is always in mesh with the high-speed transmission gear 20.

Also, this gear 1 is attached to the side of the low-speed transmission gear 19.
9 toward the clutch sleeve 21 side, and when the clutch sleeve 21 and the low-speed transmission gear 19 engage with each other by operating the shift fork shaft 22 toward the low speed side, the rotational phase of the pawl clutch portion is adjusted. The spring 24 is configured to provide elastic flexibility to shift the gear 19 backward until the gears are aligned. The second transmission shaft 15 includes a large-diameter passive gear 25 that meshes with the low-speed transmission gear 19.
and a small-diameter passive gear 26 that meshes with the high-speed transmission gear 20 are each externally fitted with a spline. Therefore, the high-speed transmission state is always maintained by the engagement between the clutch sleeve 21 and the high-speed transmission gear 20, and the clutch sleeve 21 and the low-speed transmission gear 1 are maintained by the pushing operation of the shift fork shaft 22.
Transmission device 1 enables low speed transmission by switching to engagement with 9.
It consists of 8. A shift gear 2 loosely fitted to the second transmission shaft 15 is disposed on the left side of the large-diameter passive gear 25.
7 is provided, tooth portions that can engage are formed on opposing sides of the shift gear 27 and the large-diameter passive gear 25, and a spring 28 is provided that biases the shift gear 27 toward the engagement side. A main clutch mechanism 29 is configured to shift the shift gear 27 to the non-engaged side against the force of the spring 28 to cut off power to the small diameter gear 27. An output gear 30 that constantly engages with the shift gear 27 is fixed to the traveling transmission shaft 16, and a transmission sprocket 31 of the wheel transmission case 6 is attached to the protruding end protruding from the transmission case 3, so that the transmission sprocket 30 is connected to the transmission shaft 16 from the engine 1. The output thereof is chain-transmitted to the propulsion wheels 5 via the transmission 18 and the main clutch mechanism 29.

FIG. 4 shows a power transmission structure from the mission case 2 to the seedling planting device 3.

A third transmission shaft 32 is located near the intermediate transmission shaft 13.
and a fourth transmission shaft 33 is provided, and this third transmission shaft 32
A shift gear 34 that meshes with the small diameter gear 12b of the two-stage gear is loosely fitted onto the third transmission shaft 32. This passive gear 34 and the third transmission shaft 32
are interlocked and connected via a planting clutch 35 and a torque limiter 36. In other words, the torque limiter 36 includes a drive side disk 37a loosely fitted to the transmission shaft 32, a driven side disk 37b spline-fitted to the transmission shaft 32, a transmission ball 38 that engages across both disks 37a and 37b, and a driven side disk 37a. 37b to the drive side disk 37a, and the drive side disk 3
The third transmission shaft 32 is driven by engaging the shift gear 34 in a pawl clutch type with the shift gear 7a, and the power is applied to the third transmission shaft 32 by disengaging the shift gear 34 from the driving side disk 37a by operating from outside the case. It is configured to block.

Further, the third transmission shaft 32 and the fourth transmission shaft 33 are connected to a gear 4 having different diameters at the ends projecting outside the case.
0 and 41, and the fourth transmission shaft 3
Bevel gears 42 and 43 provided on both left and right sides of 3,
Bevel gears 46, 47 of the fifth transmission shaft 44 and the sixth transmission shaft 45 inserted into the frames 4a, 4b
It is configured so that two systems, left and right, are branched and transmit power to the seedling planting device 3 by interlocking them with each other.

Note that the movement space of the shift gear 34 constituting the planting clutch 35 toward the clutch disengagement side and the rotation locus of the protrusion 48 fixed at a predetermined phase in the circumferential direction of the fourth transmission shaft 33 are made to overlap, so that the fourth Transmission shaft 33
The structure is such that the transmission to the seedling planting device 3 can be interrupted to stop the planting operation only when the planting claws 10a and 10b are in a predetermined rotational phase (specifically, when the planting claws 10a and 10b are in an upward rotational phase). There is. Moreover, the gears 40 and 41 attached to the shaft ends of the two transmission shafts 32 and 33 are as follows.
By removing the cover 49, both transmission shafts 32,
It is possible to replace it with 33, and this gear replacement,
Or by replacing it with a gear pair prepared separately.
The driving speed of the seedling planting device 3 is changed with respect to the traveling speed, so that the planting pitch in the direction of movement of the machine can be adjusted.

At the rear ends of the left and right frames 4a, 4b, crankshafts 50a, 50b, which are interlocked with bevel gears to fifth and sixth transmission shafts 44, 45 installed inside, are horizontally supported via brackets 51a, 51b.
Crank arms 52a, 52b are attached to the projecting ends of the crankshafts 50a, 50b on the inside of the body. A swinging arm 54a, in which the tip of each crank arm 52a, 52b is pivotally connected to the middle of the planting arms 53a, 53b, and the ends of the planting arms 53a, 53b are pivotally connected to the brackets 51a, 51b; 54b, and as the crank arms 52a, 52b rotate in a certain direction, the tips of the planting claws 10a, 10b attached to the respective planting arms 53a, 53b are connected to the seedling stand 8. Constant circular rotation trajectory S spanning between the lower end and the surface T
It is designed to depict.

Rear end bracket 51 of the frames 4a, 4b
The base ends of left and right steering handles 55, 55 are connected to a, 51b, and are used for horizontally transporting the seedling stand 8 between brackets 56, 56 set up on the upper surface of the base of each handle 55, 55. A crankshaft 5 horizontally supports the screw shaft 57 and is interlocked with one end of the screw shaft 57 and the fifth transmission shaft 44.
0a and the chain 58 in the transmission case 58.
They are interlocked and connected at a.

The screw shaft 57 is formed with a series of reciprocating screw grooves 59, and a movable boss 61 that rotatably supports a driven member 60 that engages in the screw groove 59 is externally fitted onto the screw shaft 57 so as to be slidable left and right. At the same time, this movable boss 61 is connected to the lower back surface of the seedling stand 9. As the screw shaft 57 rotates in one direction, the seedling stand 9 is moved laterally in a reciprocating manner with a constant stroke corresponding to the width of the pine-shaped seedling A.

The seedling stand 9 is attached to the left and right brackets 56, 5.
The planting nails 10
a and 10b are structured to pass through notches 63a and 63b formed at two places on the left and right sides of the sliding rail 63.

Further, on the back near the lower part of the seedling stand 9, a seedling feed shaft 65 consisting of a hexagonal shaft equipped with a rotary claw 64 for feeding seedlings is horizontally supported, and the left and right two sides of the shaft 65 are supported horizontally.
Passive arms 67a and 67b are attached to the positions via one-way rotation clutches 66 and 66, respectively. The passive arms 67a, 67b are arranged so as to come into contact with the rotating arms 68a, 68b fixed near the end of the screw shaft 57 when the seedling stand 9 reaches the stroke end, and are arranged so as to come into contact with the rotating arms 68a, 68b fixed near the end of the screw shaft 57. Each time the table 9 reaches the stroke end, the seedling feed shaft 65 rotates forward by a certain angle and the placed seedlings A are sent downward by the rotary claws 64. In addition, the rotating arms 68a, 6
Passive arms 67a, 6 released from contact with 8b
7b is rotated back to its original position by springs 69, 69 to prepare for feeding the seedlings at the next stroke end.

Further, the sliding rail 63 is supported by brackets 56, 56 so that its position can be adjusted in the direction of inclination of the seedling rack while supporting the seedling rack 8, and thereby the lower end of the seedling rack 9 and the planting can be adjusted. By changing the overlapping distance with the claw tip trajectory S, the amount of seedlings taken out can be adjusted.

Further, the planting arms 53a and 53b are respectively equipped with seedling pushing rods 70 that move in and out along the planting claws 10a and 10b, and as shown in FIG. The rod 70 is configured to protrude toward the toe side and push the cut seedling a into the soil.

Although the seedling planting device 3 is configured as described above, it is further provided with the following auxiliary mechanism in order to stabilize the seedling planting posture.

In other words, a rotation support shaft 71 is horizontally supported across the rear end brackets 51a, 51b of the left and right frames 4a, 4b via bosses 72, 72, and a pair of left and right bulges are provided at two locations on the left and right of this support shaft 71. Arms 73, 73 for use are fixedly installed. As shown in FIG.
The hole B formed around the planted seedling a by the plunge of 0a and 10b into the soil is backfilled by pressing mud from the left and right to maintain the planted seedling a in an appropriate standing posture. The tip fixed shaft 74 of the crank arm 52b is driven by a transmission system that is not involved in driving the screw shaft 57 for horizontally moving the seedling table.
An auxiliary crank arm 75 fixed to the pivot shaft 71 and an arm 76 fixed to the pivot shaft 71 are pivotally connected by a link 77, and the earthing arm 7 is moved in synchronization with the seedling planting operation.
3 and 73 are vertically swung to perform the above-mentioned soil gathering function. In addition, S' in Figure 7 is
This is the ground trajectory of the tip of the claw, taking into account the forward movement of the aircraft.

[Brief explanation of drawings]

The drawings show an embodiment of the walk-behind rice transplanter according to the present invention, in which Fig. 1 is a schematic plan view of the whole, Fig. 2 is a side view of the whole, Fig. 3 is a developed plan view showing the proposed transmission structure, and Fig. Fig. 4 is a developed plan view showing the transmission structure to the seedling planting device, Fig. 5 is a sectional view taken along the line V-V in Fig. 4, Fig. 6 is a sectional view taken along the - line in Fig. 4, and Fig. 7 is a sectional view taken along the line - in Fig. 4. Side view of main parts showing planting state, Figure 8a
~c is a schematic plan view of a conventional transmission structure. 2...Mission case, 3...Seedling planting device,
4a, 4b...Frame, 9...Seedling stand, 10
a, 10b... Planting claw, 57... Screw shaft, 73...
...Soil arm.

Claims (1)

[Claims] 1. The mission case 2 located at the front of the machine and the seedling planting device 3 located at the rear of the machine are connected by a pair of left and right hollow frames 4a, 4b, and the power extracted from the mission case 2 is divided into two systems. branch,
Each branched power is guided to the seedling planting device 3 through the frames 4a and 4b, and one branched power drives the planting claw 10a and the screw shaft 57 for horizontal feeding of the seedling stand 9, and the other branched power drives the horizontal feeding screw shaft 57 of the seedling stand 9. So, another planted nail 1
A walk-behind rice transplanter configured to drive an arm 73 for bringing soil to the planted seedlings a.