JPH05153805A - Steering device for walking type vegetable transplanter - Google Patents

Abstract

(57) [Summary] [Purpose] In a walk-behind vegetable transplanter, the steering wheel is automatically turned in response to the bending of the ridges to reduce the operator's burden and to ensure that the seedlings are planted as desired. Allow it to be planted in the appendix. [Structure] A pair of left and right steered wheels 2 respectively held by steerable steering wheel holding members 29, 29 which are provided across ridges
3 and 23, and ridge guide rollers 33, 33 attached to a ridge guide roller support arm 31 which can swing left and right about a predetermined fulcrum and brought into contact with or close to the slope of the ridge. The steering wheel holding members 29, 29 of the steering wheel holding member 2 are connected by interlocking the interlocking arms 35, 35 separately provided on the steering wheel holding members 29, 29 with the ridge guide roller support arm 31.
The distance L _W from the fulcrum of the ridge guide roller support arm 31 to the connection point of the ridge guide roller support arm and the connection member 36 from the distance L _G from the turning center of 9 to the connection point of the interlocking arm 35 and the connection member 36. Made longer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering device for a walk-behind vegetable transplanter which automatically turns a steering wheel in accordance with the bending of a ridge.

[0002]

2. Description of the Related Art A pair of left and right steerable wheels that straddle a ridge are provided in the front part of the machine body, and a steering handle is provided in the rear part of the machine body so that the operator can operate the handle while following the progress of the machine body while walking. There is a walk-behind vegetable transplanter that does.

[0003]

In the conventional walk-behind vegetable transplanter described above, it is necessary for the operator to always hold the steering wheel to correct the course even during the planting work, which imposes a heavy burden on the operator. Also, if the ridge is bent, the handle may be operated incorrectly and the planting position of the seedling may be the desired planting line (for example, the center of the ridge).
It was easy to slip off.

Therefore, according to the present invention, the steering wheel is automatically turned in response to the bending of the ridges to reduce the burden on the operator during the planting work, and at the same time, the seedlings are always desired to be planted. The challenge is to be planted in.

[0005]

In order to solve the above problems, the present invention has the following constitution. That is, the walk-behind vegetable transplanter according to the present invention includes a pair of left and right steering wheels that are respectively held by a freely rotatable steering wheel holding member that is provided across a ridge, and swings left and right around a predetermined fulcrum. A ridge guide roller attached to a movable ridge guide roller support arm and provided with a ridge guide roller that is in contact with or close to the slope of the ridge, and the interlocking arm and the ridge guide roller provided separately on the left and right steering wheel holding members. The supporting arms are interlockingly connected by a connecting member, and the ridge guide roller supporting arm and the connecting member are connected from the fulcrum of the ridge guide roller supporting arm to the connecting point between the turning center of the steering wheel holding member and the connecting arm and the connecting member. The feature is that the distance to the connection point of is made longer.

[0006]

When the ridge is bent, the ridge guide roller is pushed by the slope of the ridge, so that the ridge guide roller support arm swings left and right around the fulcrum, and the left and right steering wheels are interlocked with this. Turn around. At this time, the ridge guide roller on the inner side of the contact comes into contact with the slope of the ridge, and the ridge guide roller on the outer side of the wrap moves away from the slope of the ridge. Less. However, the distance from the fulcrum of the ridge guide roller support arm to the connection point of the ridge guide roller support arm and the connecting member is more than the distance from the turning center of the steering wheel holding member to the connection point of the interlocking arm and the connecting member. Since the length of the ridge is long, the turning amount of the steering wheel is larger than the turning amount of the ridge guide roller, and the turning amount of the steering wheel is an appropriate amount corresponding to the actual bending of the ridge. The steered wheels automatically turn by an appropriate amount according to the bend, and steering is performed accurately and smoothly.

[0007]

1 is an overall side view of a walk-behind vegetable transplanter according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a plan view showing a partially removed state. This walking type vegetable transplanting machine 1 comprises a seedling placing table 2 on which seedlings are placed, a planting device 3 for sequentially planting the seedlings on the seedling placing table in a field scene, and a soil for forming seedling transplant holes in the field scene. Digging device 4 and crushing device 5 for burying seedling transplant holes after seedling transplantation with soil and suppressing the surrounding area
And a planting depth control device 6 for controlling the planting depth of the seedlings to be always constant, and a control unit 7.

In the figure, 10 is an engine, 11 is a rear mission case, 12 is a front mission case,
Both mission cases 11 and 12 are connected by a transmission frame 13. These, the side frame 14 and the front frame 16 form a body frame. The rear wheel support cases 19 and 19 are rotatably fitted to the front end portions of the axle cases 18 and 18 protruding left and right from the rear mission case 11 with their cylindrical base portions 19a and 19a. The rear wheel support cases 19 and 19 project obliquely downward to the front, and the rear wheels 2 serving as drive wheels are attached to the front ends thereof.
0, 20 is pivotally supported. Also, the front frame 1
At the front end portion of 6, front wheels 23,
23 is rotatably supported. The rear wheels 20, 20 which are the driving wheels and the front wheels 23, 23 which are the rolling wheels support the machine body. The center of gravity of the machine body is preferably located in front of the rear wheel shaft 20a and in the vicinity of the rear wheel shaft 20a.

As shown in FIG. 4, the parallel link mechanism 22 includes a center link 25 fixed to the front frame 16.
And a pair of upper and lower horizontal links swingably supported on the upper and lower ends of the center link on the front surface side, and vertical links 27, 27 connecting the ends of the pair of upper and lower horizontal links. Then, the steering wheel holding members 29, 29 are rotatably attached to the cylindrical body 28 fixed to the vertical links 27, 27,
Front wheels 23, 23, which are steering wheels, are axially supported by the steering wheel holding member. The front wheel 23 is located rearward of the turning center shaft 29a of the steering wheel holding member 29. When the field scene is tilted left and right, the parallel link mechanism 22 swings to adjust the height of the left and right front wheels 23, 23. The distance between the front wheels 23, 23 (front tread) is the distance between the rear wheels 20, 20 (rear tread)
It is almost the same as. The front tread changes due to the swing of the parallel link mechanism 22, but the amount of swing of the parallel link mechanism 22 is actually small, so the change amount of the front tread falls within a practically allowable range.

Further, a ridge guide roller support arm 31 projecting forward is provided on the bottom surface of the center link 25 so as to be swingable in a horizontal plane by a support shaft 31a, and a ridge surface is provided at the front end of the ridge guide roller support arm. Squeezing roller 3 for smoothing
2 and a pair of left and right ridge guide rollers 33, which are obliquely provided so as to come into vertical contact with the slope of the ridge.
The ridge guide rollers 33, 33 are ridge guide roller support arms 31.
Are selectively attached to the plurality of mounting holes 34, ..., And the intervals between them can be adjusted.

The steering device A for the front wheels 23, 23 is constructed as follows. Interlocking arms 35, 35 projecting forward are integrally formed with the steering wheel holding members 29, 29, and their tip ends are connected to each other by a connecting rod 36 which is a connecting member. A locking piece 38 having a long hole 37 in the front-rear direction is fixed to the connecting rod 36, and a pin 39 protruding from the ridge guide roller supporting arm 31 is provided in the long hole.
Are fitted. During work, when the ridge is bent, the ridge guide roller 33 is pushed by the slope of the ridge and the ridge guide roller support arm 31 swings, so that the connecting rod 35 is swung left and right by the pin 39. Accordingly, the left and right front wheels 23, 23 work together to change the steering angle. As shown in the schematic view of FIG. 5, the ridge guide is longer than the distance L _G from the turning center shafts 29a, 29a of the steering wheel holding members 29, 29 to the connection point P _G of the interlocking arms 35, 35 and the connecting rod 36. From the support shaft 31a of the arm 31, the ridge guide arm and the connecting rod 3
Since the distance L _W to the connection point P _W with 6 is longer, the front wheel 2 is larger than the turning amount of the ridge guide rollers 33, 33.
The turning amount of 3,23 is larger.

The seedling mounting table 2 is slightly inclined so that the front part thereof is positioned higher, and is supported by a lateral frame 40 and a rail 41 so as to be slidable right and left. Then, it is configured to reciprocate left and right by a lateral feed mechanism 44 driven from the front mission case 12 via a chain in the chain case 43. The bottom surface of the seedling placing table 2 is open, and a seedling feeding belt 46 for transferring the seedlings on the table backward is attached to the bottom portion. The seedling feeding belt 46 is intermittently circulated in a predetermined direction by a vertical feeding mechanism 47 that operates when the seedling placing table 2 reaches the end portions of the left and right strokes. Also,
A seedling receiving plate 50 having a seedling take-out port 49 formed in the center is provided integrally with the lateral frame 40 adjacent to the rear end of the seedling placing table 2. Further, a comb-shaped seedling holder 51 that receives and holds the seedlings so that the seedlings in the last row on the seedling mounting table do not fall from the seedling receiving plate 50.
Is provided at the rear end of the seedling stand 2.

When the seedlings are placed on the seedling placing table 21 and each part is activated, the seedling placing table 2 moves laterally and the seedlings in the last row located on the seedling receiving plate 50 are sequentially supplied to the seedling taking-out port 49. To do. When the seedling stand 2 reaches the end of the left and right strokes, all the seedlings in the last row are taken out from the seedling outlet 4.
When the supply of the seedlings to the seedlings 9 is completed, the seedling feeding belt 46 moves by an appropriate amount and transfers the seedlings on the seedling mounting table backward by one row.

The planting device 3 includes a first rotating case 60 attached to an intermediate portion of the transmission case 13, a second rotating case 61 attached to a tip portion of the first rotating case, and a tip end of the second rotating case. And a transplant case 62 attached to the
A pair of planting claws 63, 63 and a seedling extruding body 6 in the transplanting case 62.
4 are provided. The planting claws 63, 63 are located symmetrically with respect to the lateral center line of the machine body, and the seedling extrusion body 64 is located at the lateral center of the machine body. Each case contains a plurality of shafts, gears, etc.
By rotating the rotating case 61 in opposite directions to each other in a predetermined direction, the transplantation case 62 draws a predetermined trajectory while keeping a fixed posture, and performs a closed-loop motion up and down. The planting claws 63, 63 are closed at the upper part of the locus to sandwich the seedling supplied to the seedling take-out port 49 of the seedling feeding device described later, and the planting claws 63, 63 are opened and the seedling pushing rod 64 is projected at the lower part of the track. It is configured to plant seedlings on the ridge.

In the earth digging device 4, the earth digging tool 70 intermittently moves downward in synchronization with the planting device 3, and the earth digging tool advances in the soil to implant a groove-shaped seedling on the ridge surface. It is designed to form a hole for use.

The compression device 5 comprises compression wheels 73, 73, which are relatively heavy in weight, mounted obliquely on the compression wheel support frame 72 so that the distance between the compression wheels becomes narrower toward the bottom. The rings 73, 73 roll on the ridges to bring down the soil on the left and right sides of the transplanted seedlings while keeping them inward.

The planting depth control device 6 appropriately raises and lowers the machine body in accordance with the height variation of the ridge surface, and is vertically rotatable so as to be in contact with the ridge surface as a means for detecting the ridge surface height. The plate-shaped grounding sensor 80 is provided. The mechanism for raising and lowering the machine body is configured as follows. That is, a pitching cylinder 81 is fixedly provided in the front-rear direction on the upper part of the rear mission case 11, and a support member 84 is attached to the piston rod of the pitching cylinder in the left-right direction, and the left and right end portions of the support member 84 and the rear wheel support case. Arms 85, 85 erected on the cylindrical base portions 19a, 19a of 19, 19.
And are connected by a rolling cylinder 86 and a connecting rod 87. Reference numeral 88 in the drawing is a guide rod for guiding the support member 84.

For example, the ridge surface becomes higher and the ground sensor 80
Is moved upward, the pitching cylinder 81 extends to rotate the rear wheel support cases 19 and 19 downward. as a result,
The aircraft descends with respect to the field scene and the planting depth is kept constant. On the contrary, when the ridge surface becomes low, the pitching cylinder 81 contracts to rotate the rear wheel support cases 19 and 19 upward.

Further, the lateral inclination of the machine body can be adjusted by expanding and contracting the rolling cylinder 86.

The control unit 7 is a front mission case 1
A control post 90 is provided so as to project upward from the upper surface of the device 1, an operation panel 91 is provided at the upper end thereof, and a control handle 92 is attached to the operation panel. The control post 90 is inclined rearward and in the direction opposite to the transmission frame 13, and the operation panel 91 and the control handle 92 are located at one side to the left or right. In the case of the illustrated example, since the transmission frame 13 is located on the left side of the machine body, the operation panel 91 and the steering handle 9
2 is on the right.

When carrying out the work, the rear wheels 20, 20 and the front wheels 23, 23 straddle the ridges to be planted,
The ridge guide rollers 33, 33 are provided along both side slopes of the ridge. Then, the rear wheels 20 and 20 are rotated to advance the machine body and are transmitted to the above-mentioned respective parts. Since the front wheel 23, which is a steering wheel, is located behind the turning center axis 29a,
Since the front wheels 23, 23 are not pushed up from the ground and swing to the left and right, straightness is maintained.

When the ridge is bent, the ridge guide roller 33 on the inner side of the rotation is pushed by the slope of the ridge, whereby the ridge guide roller support arm 31 swings left and right about the support shaft 31a. This operation is transmitted to the interlocking arms 35, 35 via the connecting rod 36 which is a connecting member, and the front wheels 23, 23 rotate. At this time, as shown in FIG. 6, since the ridge guide roller 33 (I) on the inner side of the contact abuts on the slope of the ridge and the ridge guide roller 33 (O) on the outer side of the line is separated from the slope of the ridge, The turning amount of the ridge guide rollers 33, 33 is smaller than the actual bending amount of the ridge. However, since L _G > L _{W as} described above, the front wheel 2 is more than the turning amount of the ridge guide rollers 33, 33.
The turning amounts of 3 and 23 are larger, and the turning amount of the front wheels is in accordance with the bending of the ridges, and the steering operation is performed accurately and smoothly.

As described above, since the steering device A works to automatically steer in accordance with the bending of the ridges, the operator only has to follow the rear of the machine. Further, since the steering is performed accurately and smoothly according to the bending of the ridges, the planting strip of the seedling is not disturbed.

Next, an example different from the gist of the present invention, but for reference, will be described. FIG. 7 is a schematic view of the steering device. In the steering device B, contrary to the steering device A, the front wheel 23 has the turning center shaft 29 of the steering wheel holding member 29.
The steering wheel holding member 2 is located in front of a.
From the turning center shafts 29a, 29a of 9, 29, the interlocking arm 3
The distance L _G between the connecting points of 5, 35 and the connecting rod 36 is longer than the distance L _W from the support shaft 31a of the ridge guide arm 31 to the connecting point between the ridge guiding arm and the connecting rod 36. ..

In this way, the front wheel 23 is connected to the steering wheel holding member 2
Positioning the shaft 9 in front of the turning center axis 29a improves the turning performance of the front wheel 23. In the case of this steering apparatus B, when traveling along a curved ridge, the ridge guide roller 33 (O) on the outer side of the rotation comes into contact with the slope of the ridge, and the amount of turning of the ridge guide rollers 33, 33 is increased. Is larger than the actual amount of ridge bending. However, since L _G <L _W , the turning amount of the front wheels 23, 23 is smaller than the turning amount of the ridge guide rollers 33, 33, and the turning amount of the front wheels is adapted to the bending of the ridges.

[0026]

As described above, when the traveling device according to the present invention is provided in the walking type vegetable transplanter, the steering wheels are automatically turned by an appropriate amount in accordance with the bending of the ridges. An operator can steer the machine accurately and smoothly without operating the steering wheel. This reduces the burden on the operator during planting work, and
The planting position of seedlings will not shift to the left or right.

[Brief description of drawings]

FIG. 1 is an overall side view of a walk-behind vegetable transplanter that is an embodiment of the present invention.

FIG. 2 is an overall plan view of the ambulatory vegetable transplanter shown in FIG.

FIG. 3 is a view showing a state in which some members such as a seedling stand are removed from FIG.

FIG. 4 is a perspective view of a parallel link mechanism and a traveling device.

5 is a schematic diagram of a traveling device of the walk-behind vegetable transplanter shown in FIGS. 1 to 4. FIG.

FIG. 6 is an explanatory view showing a state of a steering wheel and a ridge guide roller when traveling along a curved ridge in a steering apparatus shown as an embodiment of the present invention.

FIG. 7 is a schematic view of a traveling device shown as a reference example.

FIG. 8 is an explanatory view showing a state of a steering wheel and a ridge guide roller when traveling along a curved ridge in a traveling device shown as a reference example.

[Explanation of symbols]

 A steering device 1 walking type vegetable transplanter 20 rear wheel 22 parallel link mechanism 23 front wheel (steering wheel) 29 steering wheel holding member 31 ridge guide roller support arm 33 ridge guide roller 35 interlocking arm 36 connecting rod (connecting member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiichiro Kinoshita 1 Hachikura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A pair of left and right steering wheels respectively held by steerable steering wheel holding members provided across the ridges, and a ridge guide roller support arm swingable left and right around a predetermined fulcrum. And a ridge guide roller that is brought into contact with or close to the slope of the ridge, and interlockingly couples the interlocking arm and the ridge guide roller support arm that are separately provided to the left and right steering wheel holding members, respectively. The distance from the fulcrum of the ridge guide roller support arm to the connection point of the ridge guide roller support arm and the connecting member is more than the distance from the turning center of the steering wheel holding member to the connection point of the interlocking arm and the connecting member. Steering device for a walk-behind vegetable transplanter characterized by a long length.