JP2003164201A - Plowing implement for isolated cultivation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an implement capable of possessing a sufficient output for plowing even by constituting it to have a small size and light weight. <P>SOLUTION: This plowing implement 1 is equipped with a frame 2, front and rear traveling wheels 3 mounted on the frame 2 and having each of the relative up and down positions to the frame 2 as freely adjustable, a screw 6 pivoted as freely rotatable to the frame 2 with a rotary shaft 4 facing approximately lower direction, an engine 9 rotating for driving the screw 6 for plowing through a deceleration transmission 7 and driving mechanism 8, and a cover 10 mounted on the frame 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tiller for tilling soil in a cultivation bed isolated from the ground.

[0002]

2. Description of the Related Art A conventional cultivator for isolated cultivation is exemplified by the cultivator disclosed in Japanese Patent Publication No. 5-1. As shown in FIG. 9, this cultivator 80 is provided with traveling wheels 84 via a driving axle 82 and a driven axle 83 which are axially supported in the front and rear of a frame 81. The driving axle 82 is driven by a driving prime mover 85. It is designed to be driven. The cultivator 80 is configured to move along the upper edge 90a of the side plate of the cultivating bed 90 via traveling wheels 84. An operating shaft 87 is axially supported between the driving axle 82 and the driven axle 83 in parallel with both shafts.
Rotary claw 88 with a claw plate protruding through a 0 ° interval
Is attached. The working shaft 87 is a tilling motor 89.
It is designed to be driven by.

[0003]

However, since the conventional cultivator 80 runs along the upper edge 90a of the side plate of the cultivating bed 90, it is necessary to use a dedicated cultivating bed. Moreover, since the conventional cultivator 80 is equipped with a drive mechanism for the traveling wheels 84 for self-propelling and is heavy, (1) the cultivating bed 90 must be firmly configured, and the cultivating bed 90 is costly. There is a problem that (2) it is difficult to move between the plurality of cultivation beds 90 arranged in series or in parallel. These are particularly problematic in the case of high-level cultivation in which the cultivation bed 90 is installed high in order to facilitate agricultural work, and are not suitable for the high-level cultivation.

Therefore, by adopting a hand-push type, the drive mechanism for the traveling wheels 84 can be omitted, and a small and light-weight motor 89 for cultivating can be adopted so that it can be easily used for aerial cultivation. It may be possible to reduce the size and weight of the cultivator 80. However, when the size and weight are reduced, there is a problem that the rotary claw 88 does not enter the soil and the body floats up when the ground is hard or when the stock is buried in the ground. Further, since the small and lightweight prime mover has a weak output, there is a problem that the output is insufficient, or an abnormal load is generated on the prime mover if the push mechanism is forcibly pushed down when the aircraft is lifted.

An object of the present invention is to solve the above-mentioned problems and to provide a tilling machine for isolated cultivation which can be provided with a sufficient output for tilling even if it is constructed in a small size and a light weight.

[0006]

In order to achieve the above object, a cultivator for isolated cultivation according to the present invention comprises a frame, front and rear traveling wheels attached to the frame, and a rotary shaft directed substantially downward. The frame includes a cultivating screw rotatably supported by a frame and a prime mover that rotationally drives the cultivating screw.

[0007] Thus, by adopting a plowing screw as the plowing nail and rotating the screw in the soil, the soil is plunged and inverted from the bottom to the top, and at the same time, the solid soil or the underground stock is removed. I'm trying to break it. According to this tillage screw, comparing the same tillage work,
Since it can be driven with less power than a rotary claw, a compact and lightweight prime mover can be adopted.

An example is shown in which the front and rear traveling wheels are attached to the frame so that their relative vertical positions relative to the frame can be adjusted.

With this structure, it is possible to adjust the depth of the screw submerged in the ground and the angle of the screw submerged in the ground.

An example is shown in which a wheel supporting portion for supporting a plurality of the traveling wheels arranged in a direction orthogonal to the traveling direction is provided, and the wheel supporting portion is attached to the frame so that the relative vertical position with respect to the frame can be adjusted.

With this, it is possible to simultaneously adjust the relative vertical positions of the plurality of traveling wheels arranged in the direction orthogonal to the traveling direction with respect to the frame only by adjusting the mounting position of the wheel supporting portion with respect to the frame. There is.

In the cultivator for isolated cultivation, a pair of guide members extending in the advancing direction are provided on both sides of the advancing direction so that the lower end edges are lower than the upper ends of the side walls of the cultivating bed on both sides of the advancing direction. The example provided with is illustrated.

By providing the pair of guide members arranged such that the lower edge portion is lower than the upper end of the side wall of the cultivating bed, the cultivator is vibrated by the vibration of the cultivator during work. Even if the traveling direction of the cultivation guide is deviated, the guide member contacts the side wall of the cultivation bed to (a) prevent the cultivation bed from being damaged, (b) prevent the shake of the machine body, or (c) prevent it. The above deviation in the traveling direction is prevented to prevent the cultivator from jumping out of the cultivation bed.

The guide member is not particularly limited, but an example is shown in which the lower end edge portion is inserted into the soil in the cultivation bed.

As a result, the body is supported by the soil and the blurring of the body is prevented. The shape of the guide member is not particularly limited, but it is preferable that the guide member is formed so that the resistance to the soil in the traveling direction is small and the resistance in the direction orthogonal to the traveling direction is large. The guide members are arranged on both sides in the traveling direction, so that both sides of the body can be surely supported by soil to reduce blurring.

The guide member is not particularly limited, but an example in which it is attached to the axle of a traveling wheel is illustrated.

Accordingly, when the relative vertical position of the traveling wheel with respect to the frame is adjusted, the relative vertical position of the guide member with respect to the frame is adjusted accordingly.

Further, in the above-mentioned tiller for isolated cultivation,
A pair of the traveling wheels arranged in a direction orthogonal to the traveling direction for traveling the rail-shaped portion extending in the bed length direction on both sides of the cultivation bed is provided, and the traveling wheels are closer to the counter frame side of the peripheral surface than the counter frame side. An example in which a guide portion having a tapered diameter is provided is illustrated.

The rail-like portion is not particularly limited as long as it is a portion extending in the bed length direction on both sides of the cultivation bed. The rail-shaped portion may be formed integrally with the cultivation bed or separately.

Accordingly, the rail-shaped portion is held by the guide portions of the pair of traveling wheels, the machine body of the tiller is positioned with respect to the cultivation bed, and the blurring of the machine body is suppressed.

An example is shown in which the traveling wheels are slidably supported in the direction orthogonal to the traveling direction and are urged toward the frame.

As a result, even if the rail-shaped portion has irregularities or the distance between both rail-shaped portions is not constant, the traveling wheel slides in the frame width direction according to the irregularities and the distance, and is stabilized. Driving is performed. That is, according to the present cultivator for isolated cultivation, not only a pair of parallel rail-shaped portions extending in a straight line designed for running wheels but also rail-shaped portions that are not so designed. Can be run.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION FIGS. 1 to 4 show a cultivator 1 for elevated cultivation according to a first embodiment of the present invention. This cultivator 1 includes a frame 2, front and rear traveling wheels 3 attached to the frame 2 so that the relative vertical positions thereof can be adjusted, and a drive shaft 4 and a driven shaft as rotary shafts that face substantially downward. 5 is attached to the frame 2 and a cultivating screw 6 rotatably supported on the frame 2 by an engine 5, an engine 9 as a prime mover for rotatably driving the cultivating screw 6 via a reduction transmission 7 and a drive mechanism 8. And a cover 10.

Cultivation bed 11 in which this tiller 1 is used
For example, as shown in FIG. 3, the casing 11a is provided with a concave cross section and extends long in the vinyl house, and a support frame 11b for supporting the casing 11a by separating it from the ground. Soil S for cultivation is stored in casing 11a, and a plant is cultivated. Casing 11
A ventilation pipe 11c is provided at approximately the center in the width direction of the bottom surface of a. By passing warm air or cold air through the ventilation pipe 11c,
The temperature of the soil S can be adjusted appropriately.

The frame 2 has a frame body 12 formed in a rectangular frame shape, a pair of front leg portions 13 extending obliquely downward from the front side of the frame body 12, and the frame body 12
It has a pair of rear leg portions 14 extending obliquely downward from the rear side. Long holes 15 extending vertically are formed on the front end sides of the front leg portions 13 and the rear leg portions 14, respectively, and the axles 3a of the traveling wheels 3 are attached to the long holes 15, respectively. By adjusting the mounting position of the axle 3a with respect to the longitudinal direction of the elongated hole 15, the relative vertical position of each traveling wheel 3 with respect to the frame 2 can be adjusted. As a result, the depth of the plowing screw 6 submerged in the ground can be adjusted, and the angle at which the plowing screw 6 submerges in the ground can be adjusted.

The front handle 17, the rear handle 1, and the rear handle 1 are provided on the front side, the rear side, and the left and right sides of the frame body 12, respectively.
8 and a pair of lateral handles 19 are attached.
The front handle 17 has a tip end bent to the left side by about 90 ° in plan view so that an operator standing on the left side of the cultivator 1 can easily operate it. A grip portion 20 is provided at the tip of the front handle 17.
And a clutch lever 21 for turning on / off the power transmission to the plowing screw 6 is provided at a substantially central portion. The rear handle 18 is formed by bending in a substantially U shape in a plan view, and both ends thereof are fixed to the frame body 12. An accelerator lever 22 for operating the number of revolutions of the engine 9 is provided substantially at the center of the rear handle 18.
The lateral handle 19 is bent and formed in a substantially U shape in a plan view, and almost the entire portion thereof serves as a grip portion. Both ends of the lateral handle 19 are fixed by bolts 24 to both ends of a support shaft 23 provided on the side of the frame body 12 and extending in the front-rear direction. The mounting angle of the lateral handle 19 with respect to the frame body 12 can be appropriately adjusted as shown in FIG. 3, that is, the grip portion of the lateral handle 19 is configured so that the relative vertical position with respect to the frame 2 can be adjusted. .

The plowing screw 6 is composed of a plurality of (three in this example) screw blades 26 in which side blades 26a and bottom blades 26b are integrally formed, and the bottom blades 26b side of each screw blade 26 is formed. The tips are connected to each other. By rotating the plowing screw 6 in the soil S, the soil S is plunged and inverted from the bottom to the top, and the solidified soil S and underground stocks are crushed. This plowing screw 6 compares the same plowing work,
It can be driven with less power than a rotary claw.

As shown in FIG. 4, the drive mechanism 8 is provided with a horizontally long drive case 30, and the drive case 30 is arranged in the frame of the frame body 12. A vertically extending drive shaft 4 is provided at one end side in the longitudinal direction of the drive case 30, a vertically extending driven shaft 5 is provided at the other end side, and an vertically extending intermediate shaft 33 is provided between the drive shaft 4 and the driven shaft 5. Vertical bearing 3
It is rotatably supported by the shafts 4a to 34c. The upper end side of the drive shaft 4 penetrates the upper wall of the drive case 30 and is connected to the speed reduction mission 7. The lower ends of the drive shaft 4 and the driven shaft 5 pass through the lower wall of the drive case 30, and the plowing screws 6 are attached to the lower ends of the drive case 30 by bolts 35 in an exchangeable manner. Sprockets 36 and 37 are attached to the longitudinal center of the drive shaft 4 and the longitudinal center of the intermediate shaft 33, respectively. The chain 38 wound around the sprockets 36 and 37 causes The rotation of the drive shaft 4 is transmitted to the intermediate shaft 33. Further, a gear 39, which meshes with the upper end side of the intermediate shaft 33 and the upper end side of the driven shaft 5,
40 are attached to each of the intermediate shafts 33
The rotational direction of the (driving shaft 4) is reversed and the power is transmitted to the driven shaft 5. That is, the two plowing screws 6 attached to the drive shaft 4 and the driven shaft 5 are adapted to cultivate the soil S in front of each other as shown in FIG. ing. By rotating the both tilling screws 6 in this way, the soil S is brought to the center, and the scattering of the soil S to the outside of the cultivation bed 11 is reduced as much as possible.

Next, a series of operation examples of the cultivator 1 will be described. In this example, a case where two workers standing on both sides of the cultivation bed 11 operate the cultivator 1 will be described. First, the engine 9 is started. Then, the deceleration mission 7
The drive shaft 4 rotates through the sprocket 3
The intermediate shaft 33 rotates via 6, 37 and the chain 38, and the driven shaft 5 rotates in the opposite direction via gears 39, 40. This causes the plowing screws 6 attached to the drive shaft 4 and the driven shaft 5 to rotate in opposite directions. Two workers standing on both sides of the cultivating bed 11 carry the lateral handles 19 of the cultivator 1 and push the cultivator 1 downward while pushing it forward. At this time, the bottom blade 26b of the tilling screw 6 acts like a drill so as to make a hole in the soil S and the plant downward, and the side blade 26a acts so as to crush and stir the soil S and the plant. To do. The soil S is cultivated by both of these actions.

When operating the cultivator 1 by one operator, stand on the left side of the cultivating bed 11 facing the traveling direction, hold the front handle 17 and the rear handle 18 of the cultivator 1, and operate the cultivator 1 To operate. At this time, the side handle 19
It is easier to remove the one.

According to the cultivator 1 for high-growth cultivation of the present invention configured as described above, the cultivating screw 6 is used as a cultivating claw.
Since it employs, compare the same tillage work,
It can be driven with less power than a rotary claw. Therefore,
A small and lightweight prime mover can be adopted as the cultivator 1, and thus the cultivator 1 can be made compact and lightweight.

Further, since the front and rear traveling wheels 3 are attached to the frame 2 so that the relative vertical positions thereof with respect to the frame 2 can be adjusted, the depth of the plowing screw 6 submerged in the ground can be adjusted, The angle at which the screw 6 dives into the ground can be adjusted. Therefore, the state of the screw 6 with respect to the ground can be adjusted so as to cultivate in an optimal state according to the configuration of the cultivation bed 11 and the state of the soil S.

The lateral handles 19 are provided on the left and right of the frame 2.
Since it is provided, the operator can stand on both sides of the cultivation bed 11, hold the grip portion of the lateral handle 19, and run the cultivator 1. Moreover, since the relative vertical position of the grip portion with respect to the frame 2 can be adjusted,
The height of the cultivating bed 11 and the height of the operator can be appropriately adjusted.

Next, the cultivator according to the second embodiment of the present invention will be described. The cultivator differs from the cultivator according to the first embodiment only in that the drive mechanism for transmitting the power of the prime mover to the screw has a variable speed. ing. Therefore, the same parts as those in the first embodiment are designated by the same reference numerals to avoid redundant description.

FIG. 5 is a sectional view showing a drive mechanism 51 of the cultivator 50, showing a state of cutting at the same position as in FIG. 4 in the first embodiment. This drive mechanism 51
Has a first driven shaft 53 extending vertically on one end side in the longitudinal direction of the drive case 52, a second driven shaft 54 extending vertically on the other end side, and vertically extending laterally on the first driven shaft 53. The drive shaft 55 is rotatably supported on the side of the second driven shaft 54 by vertically extending intermediate shafts 56 via vertical bearings 57a to 57d. The upper end side of the drive shaft 55 penetrates the upper wall of the drive case 52 and is connected to the speed reduction mission 7. A pair of drive gears 58 and 59 having different numbers of teeth are provided at two positions in the middle of the drive shaft 55 in the longitudinal direction at intervals.
(The upper drive gear 58 has a larger number of teeth.). A boss portion 60 is slidably mounted on the upper end side of the first driven shaft 53 so as to be vertically slidable and non-rotatable relative to each other, and the two drive gears 58 are provided at two positions in the length direction of the boss portion 60. , 59, a pair of driven gears 61 and 62 having different numbers of teeth (the lower driven gear 62 has a larger number of teeth) is provided. And the boss 6
When the boss portion 60 is slid downward by operating the 0 vertical position switching portion 63, only the lower drive gear 59 of the drive shaft 55 and the lower driven gear 62 of the first driven shaft 53 are moved. When meshed with each other (low speed side, state shown in FIG. 5) and the boss portion 60 is slid upward, only the upper drive gear 58 of the drive shaft 55 and the upper driven gear 61 of the first driven shaft 53 are moved. It is designed to mesh with each other (high speed side). Sprockets 65 and 66 are attached to the upper side of the vertical bearing 57a of the first driven shaft 53 and the upper side of the vertical bearing 57d of the intermediate shaft 56, respectively, and the chain 67 wound around both sprockets 65 and 66.
Thus, the rotation of the first driven shaft 53 is transmitted to the intermediate shaft 56. Further, gears 68, 69 meshing with each other are attached to the upper end side of the intermediate shaft 56 and the upper end side of the second driven shaft 54, respectively. Here, the rotation direction of the intermediate shaft 56 (first driven shaft 53) is set. It is adapted to be inverted and transmitted to the second driven shaft 54. in this way,
The drive mechanism 51 is configured so that it can be switched to either low speed or high speed.

In addition to the effects of the first embodiment, according to the present embodiment, the power of the engine 9 can be speed-changed and transmitted to the plowing screw 6, so that the screw 6 of the screw 6 can be changed according to the state of the soil S. The rotation speed can be changed appropriately. For example, when a plant strain is buried in the soil S, such as after harvesting the plant, it is necessary to cultivate the plant while cutting the strain, so that the plowing screw 6 is rotated at high torque. The drive mechanism 51 is switched to the low speed side. Further, for example, after cultivating once on the low speed side or when cultivating the soil S that does not contain a stock, the speed of the cultivating work can be improved by switching the drive mechanism 51 to the high speed side. .

Next, the cultivator according to the third embodiment of the present invention shown in FIGS. 6 and 7 will be described. This cultivator 100
Mainly differs from the second embodiment only in the following points. Therefore, the same parts as those in the second embodiment are designated by the same reference numerals to omit redundant description.

(1) A wheel supporting portion 70 is attached to the frame 2 by a mounting member 71 so that the vertical position of the wheel supporting portion 70 can be adjusted. The axles 3a, 3a of the wheels 3, 3 are attached. With this configuration, the frame 2 of the plurality of traveling wheels 3 and 3 arranged in the width direction of the frame 2 can be simply adjusted by adjusting the mounting position of the wheel support portion 70 to the frame 2.
The relative vertical position relative to can be adjusted simultaneously.

(2) A pair of guide members 101 arranged on both sides in the traveling direction and extending in the traveling direction are provided. This guide member 101 is made of a substantially suspended plate-like body, and its front edge portion 101a and rear edge portion 101b are bent to the frame 2 side so as not to damage the casing 11a, and are formed on both sides in the traveling direction. The lower end edge portion 101c of the guide member 101 is located at a position lower than the upper end of the side wall of the casing 11a, and the lower end edge portion 101c is located at the traveling wheel 3.
Is arranged so as to be below the lower end of the. In this way, the guide member 101 is arranged such that the lower end edge portion 101c is lower than the upper end of the side wall of the casing 11a, so that the traveling direction of the cultivator 100 is affected by the vibration of the cultivator 100 during work. Even if the position is deviated, the outer side surface of the guide member 101 extending in the advancing direction mainly contacts the inner side surface of the side wall of the casing 11a, so that (a) the casing 11a.
To prevent damage to the cultivator, (b) to prevent the body from shaking, and (c) to prevent further deviation in the traveling direction to prevent the cultivator 100 from jumping out of the casing 11a. Has become. In addition, the guide member 10
1 is disposed below the lower end of the traveling wheel 3, so that the lower end edge portion 101c thereof can enter the soil S during the plowing work, and at this time, it easily enters the soil S. To this end, the front and rear corners on the lower end side are obliquely omitted in a side view. In this way, the guide member 101 is
The resistance to the soil S in the traveling direction is small, and the resistance in the direction orthogonal to the traveling direction is large.
The guide member 101 supports the airframe on the soil S,
It is designed to prevent the body from shaking. The guide member 101 is attached to the tip of the axle 3a of the traveling wheel 3 with a screw 102 (in this example, a truss screw whose head projection height is low) through vertically extending elongated holes 101d. The vertical mounting position relative to the axle 3a is adjustable. Since the guide member 101 is attached to the axle 3a of the traveling wheel 3 in this way, when the relative vertical position of the traveling wheel 3 with respect to the frame 2 is adjusted, the relative vertical position of the guide member 101 with respect to the frame 2 is also adjusted accordingly. It is supposed to be done.

As described above, according to the present embodiment, each effect described above can be obtained in addition to the effects of the second embodiment.

Next, the cultivator according to the fourth embodiment of the present invention shown in FIGS. 10 to 12 will be described. This cultivator 11
0 is mainly different from the first embodiment in that it is configured to run on a pipe rail 131 as a rail-shaped portion extending in the bed length direction on both sides of the cultivation bed 130. Further, it is different from the first embodiment in that the plurality of traveling wheels 114 arranged in the width direction of the frame 2 (direction orthogonal to the traveling direction) can be simultaneously adjusted in relative vertical positions with respect to the frames 2. The third embodiment is common to the third embodiment. Therefore, the same parts as those in the first and third embodiments are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 11, the cultivation bed 130 used in this example supports a pair of pipe rails 131 extending in the length direction of the bed with a space left and right, and supports both pipe rails 131 with respect to the ground. And a non-woven sheet 133 whose both widthwise edges are supported by both pipe rails 131. Pipe rail 13 of this example
1 comprises a plurality of pipes 135 connected by a joint member 134. In addition, the pipe rail 131
Is connected to the pipe frame 132 via a mounting member 136. The sheet 133 is supported in a slack state in a substantially U-shaped cross section, and the soil S for cultivation is stored inside the sheet 133,
Plants are becoming cultivated. The cultivating bed 130 is an example and is not particularly limited as long as it has rail-shaped portions extending in the bed length direction on both sides of the cultivating bed.

In the cultivator 110 of this example, wheel supporting portions 70 are attached to the front end portion and the rear end portion of the frame 2 so that the relative vertical positions can be adjusted with respect to the frame 2, respectively, by attaching members 71, and each wheel is mounted. The support portion 70 supports a pair of left and right axles 112 extending outward in the width direction of the frame 2. Each axle 112 has a cylindrical spacer 113, a traveling wheel 114, a compression spring 115, and a disc-shaped spring retainer 116.
In this order, it is slidably inserted in the longitudinal direction of the axle.
Then, the spring retainer 116 is prevented from coming off from the axle 112 by the bolt 117 screwed to the tip of the axle 112, and the compression spring 115 is compressed by the spring retainer 116, so that the traveling wheel 114 is attached to the frame 2 side. It is energized. The distance between the left and right traveling wheels 114 may be changed, for example, by changing the length of the spacer 113, or by inserting the traveling wheel 114, the compression spring 115, the spring retainer 116, and the spacer 113 in this order on the axle 112 as shown in FIG. It can be adjusted by

The traveling wheel 114 has a wheel body 120 composed of an inner cylinder portion 121 and an outer cylinder portion 122 that are concentrically located, and a connecting portion 123 that connects the both cylinder portions, and the outer cylinder portion thereof. On the side opposite to the frame 122, a guide portion 125 is integrally formed, the diameter of which is tapered toward the side opposite to the frame. Then, as shown in FIGS. 11 and 12, the traveling wheel 1
14 is adapted to roll while the wheel body 120 is placed on the pipe rail 131 of the cultivation bed 130.

As described above, according to this embodiment, in addition to the effects similar to those of the first and third embodiments, the left and right traveling wheels 11 are provided.
Reference numeral 1 denotes a guide portion 1 that is on the side opposite to the frame of the outer tubular portion 122 of the wheel body 120 and has a diameter that tapers toward the side opposite to the frame.
25, it is possible to hold the pipe rails 131 by the guide portions 125 and position the cultivator 110 with respect to the cultivation bed 130. For this reason,
The shake of the cultivator 110 can be suppressed.

The traveling wheels 114 are slidably supported in the direction orthogonal to the traveling direction and at the same time as the frame 2
Since the pipe rail 131 is urged toward the side, the pipe rail 131 is uneven, such as a portion where the joint member 134 and the mounting member 136 of the pipe rail 131 are provided, or the interval between both pipe rails 131 is not constant. However, the traveling wheels 114 slide in the width direction of the frame 2 in accordance with the irregularities and the intervals. Therefore, the cultivator 11
No. 0 can run stably even if the rail-shaped portion has irregularities. That is, according to the present cultivator 110, not only a pair of parallel rail-shaped portions extending in a straight line designed for running wheels, but also a rail-shaped portion not designed as such Can be run.

The present invention is not limited to the above-described embodiment, but may be embodied with appropriate modifications within the scope not departing from the spirit of the invention, for example, as follows. (1) In the first or second embodiment, the mounting structure of the traveling wheel 3 on the frame 2 is appropriately changed. For example, instead of the elongated hole 15, a plurality of holes are provided in the vertical direction on the front end side of the front leg portion 13 and the rear leg portion 14, and the axle 3a of the traveling wheel 3 is selectively attached to any of the holes. The embodiment of According to this aspect, the relative vertical position of each traveling wheel 3 with respect to the frame 2 can be adjusted by changing the hole for attaching the axle 3a of the traveling wheel 3.

(2) In the first or second embodiment, the structure for adjusting the relative vertical position of the traveling wheel 3 with respect to the frame 2 is appropriately changed. For example, the axle 3 of the traveling wheel 3
As for a, a wheel supporting member (not shown) may be fixed at one location, and the mounting angle and the mounting position of the wheel supporting member with respect to the frame 2 may be adjusted.

(3) In the first or second embodiment, the plurality of traveling wheels arranged in the frame width direction (direction orthogonal to the traveling direction) can be simultaneously adjusted in relative vertical positions with respect to those frames. For example, in FIG.
As shown in FIG. 3, the wheel supporting portion 70 is attached to the frame 2 by a mounting member 71 so as to be adjustable in vertical position, and a plurality of traveling wheels 3, which are arranged in the width direction of the frame 2 on the wheel supporting portion 70.
A mode in which the respective axles 3a, 3a of 3 are attached is mentioned.
By doing so, it is possible to simultaneously adjust the relative vertical positions of the plurality of traveling wheels 3, 3 arranged in the width direction of the frame 2 with respect to the frame 2 only by adjusting the mounting position of the wheel support portion 70 with respect to the frame 2.

(4) The distance between the left and right traveling wheels 3 should be adjustable. (5) Change the number of the tilling screws 6 appropriately. (6) Adopt a cultivating screw having another configuration, such as a cultivating screw having a free end at the bottom blade 26b side of each screw blade 26. (7) Use an electric motor as a prime mover instead of the engine. (8) Both guide members 101 are arranged so that the inner side surfaces of both guide members 101 abut the side wall outer side surfaces of the cultivation bed 11.

[0051]

The cultivator for isolated cultivation according to the first aspect of the present invention has an excellent effect that a sufficient output for cultivating can be provided even if it is constructed in a small size and a light weight.

In addition to the above effects, according to the inventions of claims 2 and 3, it is possible to adjust the tillage in an optimum condition according to the structure of the cultivation bed and the condition of the soil.

In addition to the above-mentioned effects, according to the inventions of claims 4 to 6, it is possible to prevent the cultivation bed from being damaged, to prevent the shake of the cultivator body, and to prevent the cultivator from jumping out of the cultivation bed. You can

In addition to the above effects, according to the inventions of claims 7 and 8, it is possible to stably run along the rail-shaped portions extending in the bed length direction on both sides of the cultivation bed.

[Brief description of drawings]

FIG. 1 is a side view of a cultivator for elevated cultivation according to a first embodiment of the present invention.

FIG. 2 is a plan view of the cultivator.

FIG. 3 is a rear view of the cultivator.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a cross-sectional view of a drive mechanism of a high-cultivation tiller according to a second embodiment of the present invention, as viewed from the back side.

FIG. 6 is a side view of a high-cultivation tiller according to a third embodiment of the present invention.

FIG. 7 is a plan view of the cultivator.

FIG. 8 is a plan view showing a modified example of the tiller for elevated cultivation of the present invention.

FIG. 9 is a side view showing a conventional cultivator.

FIG. 10 is a side view of a cultivator for elevated cultivation according to a fourth embodiment of the present invention.

11 is a view taken along arrow XI of FIG.

FIG. 12 is a view similar to FIG. 11 showing a state in which the left and right wheel intervals of the cultivator are narrowed.

[Explanation of symbols]

1 High-cultivating tiller 2 frames 3 running wheels 4 Drive shaft as rotation shaft 5 Driven shaft as rotating shaft 6 Tilling screw 8 drive mechanism 9 engine 11 cultivation beds 50 High-cultivation tiller 51 Drive mechanism 53 First driven shaft as rotating shaft 54 Second driven shaft as rotating shaft 100 High-cultivating tiller 101 Guide member 110 High-cultivating tiller 112 axles 113 spacer 114 running wheels 115 compression spring 116 Spring retainer 120 wheel body 125 guide 130 cultivation beds 131 Pipe rail 132 pipe frame 134 Joint member 135 pipe 136 mounting member

Claims (8)

[Claims] 1. A frame, front and rear traveling wheels attached to the frame, a plowing screw rotatably supported on the frame by a rotation shaft directed substantially downward,
A cultivator for isolated cultivation, comprising a prime mover that rotationally drives the cultivating screw. 2. The cultivator for isolated cultivation according to claim 1, wherein the front and rear traveling wheels are attached to the frame so that relative vertical positions with respect to the frame can be adjusted. 3. A wheel supporting portion for supporting a plurality of the traveling wheels arranged in a direction orthogonal to a traveling direction, the wheel supporting portion being attached to the frame so that a relative vertical position with respect to the frame can be adjusted. The cultivator for isolated cultivation described. 4. A pair of guide members extending in the advancing direction, which are arranged on both sides of the advancing direction so that lower end edges of the side walls of the cultivation bed on both sides of the advancing direction are lower than upper ends thereof. The cultivator for isolated cultivation according to any one of 3 above. 5. The cultivator for isolated cultivation according to claim 4, wherein the guide member is arranged so that the lower end edge portion thereof enters the soil in the cultivation bed. 6. The cultivator for isolated cultivation according to claim 4, wherein the guide member is attached to an axle of a traveling wheel. 7. A pair of the traveling wheels arranged in a direction orthogonal to a traveling direction for traveling on rail-shaped portions extending in the bed length direction on both sides of the cultivation bed, the traveling wheels being provided on the side opposite to the frame on the peripheral surface. The cultivator for isolated cultivation according to any one of claims 1 to 6, wherein the cultivator for isolated cultivation according to any one of claims 1 to 6 has a guide portion that is tapered toward the opposite frame side. 8. The cultivator for isolated cultivation according to claim 7, wherein the traveling wheels are slidably supported in a direction orthogonal to the traveling direction and are biased toward the frame.