JPH0795827A - Root-cutter and root-cutting blade for the cutter - Google Patents

Abstract

PURPOSE:To provide a root cutter capable of rightly and easily cutting roots radially extending from the base of a plant to be transplanted and easily and rightly digging up the base of the plant together with a prescribed quantity of soil. CONSTITUTION:This root cutter is provided with a main body 2 containing an impact mechanism and with a root-cutting blade 5 supported by the main body and moving by receiving the impact force generated by the impact mechanism. The root-cutting blade 5 is provided with a shank part 5a supported in a state axially reciprocative within a prescribed range relative to the main body and a plate blade part 5b extended in the form of a strip having a prescribed width from the lower part of the shank in a state to include the axial line of the shank. As necessary, tapered parts are formed on both side edges of the plate blade 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a root-cutting machine and a root-cutting blade used for the root-cutting machine, which is capable of cutting roots extending in the soil quickly and simply when transplanting a plant such as a tree or a plant to another place. Regarding what you made possible.

[0002]

2. Description of the Related Art When transplanting a plant to another place, it is necessary to dig up the root of the plant together with a certain amount of soil.
In the growing plants, the roots extend radially from the ground surface in a range of almost a predetermined depth, and therefore, in order to dig up the root part of such a plant with a certain amount of soil, it extends radially as described above. You have to cut the root along the way.

The roots to be cut as described above have a diameter of 2 depending on the degree of growth of plants such as trees to be transplanted.
Some are 3 to 3 cm, and some are relatively thick. Obviously, it is very difficult to cut such a large root with a normal scoop. In addition, at the time of transplantation, the roots should be dug up with a certain amount of soil from the transplantation source so that the growth of plants at the transplantation destination can be done without problems, in other words, so-called rooting can be done smoothly. However, if you perform an operation such as giving more vibration than necessary to this root when cutting the root as described above, the soil will peel off from the root part, and you can not properly excavate with the soil of the transplantation source Occurs.

Further, plants for landscaping are often cultivated in forests, and there are many cases in which the above root digging work cannot be performed after carrying in a large-scale device.

Further, when the root portion is dug up using a blade having a normal scoop shape, the tip of the scoop-shaped blade has a narrow width, so that the blade is randomly laid around in the soil. Without cutting the roots without fail
The blade easily penetrates deeply. Further, in some cases, the blade body may be buried more deeply in the soil than necessary. Due to this, even if an attempt is made to pull out the blade body from the soil, a large number of roots will be caught by the blade body, and the pulling-out work will be greatly hindered.

The present invention has been devised under the circumstances as described above, and the roots extending into the soil can be smoothly and properly prepared when transplanting a plant while significantly reducing the labor of the operator. An object of the present invention is to use a root-cutting machine that can be cut and can be used for proper excavation work of the root part of a plant to be transplanted, and a root-cutting blade used for the root-cutting machine.

[0007]

In order to solve the above problems, the present invention takes the following technical means.

That is, according to the invention described in claim 1 of the present application, a main body incorporating an impact mechanism, and a main body supported by the main body,
A root-cutting machine comprising: a root-cutting blade that is actuated by the impact of the impact mechanism, wherein the root-cutting blade is a shank portion that is supported so as to be reciprocally driven by a predetermined distance in the axial direction with respect to the main body. It is characterized in that the shank portion is formed below the shank portion with a plate-shaped blade portion extending in a strip shape having a predetermined width so as to include the axis of the shank portion.

The invention described in claim 2 of the present application is
A root cutting machine comprising a main body having a built-in impact mechanism and a root cutting blade supported by the main body and operated by receiving an impact from the impact mechanism, wherein the root cutting blade is relative to the main body. A shank portion supported so as to be capable of reciprocating a predetermined distance in the axial direction, and a plate-shaped blade portion extending so as to include the axis of the shank portion at a lower portion of the shank portion, and both sides of the plate-shaped blade portion. The edge is characterized in that a tapered portion is formed so that the width of the plate-shaped blade portion becomes narrower as it moves to the base end side.

In this case, the length of the plate-shaped blade portion of the root cutting blade is set to a length corresponding to a root cutting depth for securing a root excavation amount necessary for rooting and growing after transplantation. It is preferably set (claim 3).

Further, it is preferable that the tapered portion is formed over substantially the entire length of both side edges of the plate-shaped blade portion of the root cutting blade body (claim 4).

[0012] Claim 5 of the present application describes a root cutting blade which is characteristic of the root cutting machine of claim 1.

Further, claim 6 of the present application describes a root cutting blade which is characteristic of the root cutting machine of claim 2.

[0014]

According to the root cutting machine according to claims 1 and 2 of the present application, the root cutting machine is held so that the tip of the root cutting blade is brought into contact with the ground surface, and the impact in the main body is exerted. When the mechanism is actuated, the root cutting blade receives a continuous axial impact by the impact mechanism at its shank.
Then, the root cutting blade is driven into the soil by the above-mentioned axial impact force and cuts the root in the soil in the process.

In the above-mentioned root cutting machine, since the force for driving the root cutting blade into the soil is obtained by the impact force generated by the impact mechanism, the operator puts the root cutting machine in a predetermined posture. It just requires the effort to hold it,
For example, it does not require excessive labor as in the case of operating a scoop.

Even if the root of the plant to be transplanted has a relatively large diameter, it will be cut smoothly by a sufficient impact force given to the root cutting blade, so that the root to be cut should be cut. It is possible to minimize the fact that the soil is peeled off when it is vibrated more than necessary.

Further, since the plate-shaped blade portion of the root cutting blade in the root cutting machine according to claim 1 is formed in a strip shape having a predetermined width and its tip is not narrow, it is stretched in the soil. It will invade while surely cutting the circulated roots. Therefore, at the time of pulling out, the plate-like blade portion of the root-cutting blade body passes through the location where the root is cut,
Pulling out work is easy. In addition, this means that at the time of transplantation, the root part of the plant with a certain amount of soil,
This is extremely effective in light of the need to dig up. This is because the strip-shaped blade portion having a strip width of a predetermined width also plays a role of preventing collapse of the soil to be dug when it is driven into the soil to cut the root.

On the other hand, since the plate-like blade portion of the root cutting blade in the root cutting machine according to the second aspect is formed with tapered portions on both side edges so that the base end side becomes narrow, When it goes in, the wide part of the tip cuts the root securely, and when it is pulled out to the base end side, the root is pushed by the tapered part, and it is more likely that the plate-shaped blade will catch the root. Get smaller. Furthermore, by forming a taper on the plate-shaped blade, it is possible to reduce the weight of the root cutting blade as compared with the case of a strip shape, and along with this, the root cutting blade follows the impact mechanism. The performance is improved and the impact mechanism and its drive source can be made compact. In addition, as described in claim 4,
If the taper portion is formed over substantially the entire length of both side edges of the plate-like blade portion, the angle formed by the taper portion and the shank portion axis can be efficiently reduced, and the catching force and resistance acting on the taper portion at the time of pulling out. The force can be suppressed as much as possible.

By the way, even if the plate-like blade portion penetrates into the soil while surely cutting the root as described above, the plate-like blade portion is caused to be extremely irregularly spread in the soil, resulting in a plate-like blade. It may be difficult to pull out the blade. In such a case, as described in claim 3, the length of the plate-shaped blade is
The length should be set to correspond to the root cutting depth to secure the amount of root excavation necessary for rooting and growing after transplantation.

That is, the root cutting depth from the ground surface is determined in advance so that the optimum root excavation amount is determined according to the type of plant and the root depth, and the root cutting depth is adjusted accordingly. The length of the plate-shaped blade portion is set so that the length becomes equal to the length. When such a setting is made, while the plate-shaped blade portion is invading the soil while cutting the root at its tip, the base end of the plate-shaped blade portion is completely buried in the soil. If the invasion is stopped immediately before it is stopped, this stop position corresponds to the optimum amount of excavation. Further, since the plate-shaped blade portion is not completely buried in the soil at the time of this stop, there is no possibility that the root will become an obstacle when pulling it out.

As a result, after the root cutting operation, the operation of extracting the root cutting blade from the soil can be performed very smoothly. Specifically, during the root cutting operation, in the state where the plate-shaped blade portion of the root cutting blade is driven into the soil, the collapsed soil or the cut root is caught by the plate-shaped blade portion, The removal operation of the root cutting blade body can be smoothly performed with a very small labor without hindering the removal operation of the blade portion.

As described above, according to the root-cutting machine according to any one of claims 1 to 4 and the root-cutting blades according to claims 5 and 6 used for the root-cutting machine, at the time of transplanting a plant, a predetermined depth from the ground surface is obtained. It is possible to cut the root that radially extends the range in a small amount of labor and quickly and appropriately, and also to help the proper excavation of the root part of the plant to be transplanted,
The workability of plant transplanting work will be significantly improved.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to the drawings.

FIG. 1 shows the overall construction of an embodiment of the root cutting machine 1 of the present invention. The main body 2 of the root cutting machine 1 can drive an impact mechanism 4 described later by using the engine 3 as a power source. At the lower end of the body 2,
A root cutting blade 5 which will be described later and is characterized by the present invention
Is supported.

First, the structure of the main body 2 of the root cutting machine 1 will be described, and then the structure of the root cutting blade 5 operated by the impact mechanism 4 of the main body 2 will be described.

The main body 2 is provided with an operation tube 6 having a base end to which the engine 3 is connected, and a distal end portion of the operation tube 6 is a substantially barrel having an axis orthogonal to the longitudinal axis of the operation tube 6. A mold housing 7 is connected, and the impact mechanism 4 is built in the housing 7.

That is, inside the housing 7,
As shown in FIG. 2 and FIG. 3, the rotating body 8 has support shafts 9a and 9b projecting from both ends thereof which are provided on both side walls 7 of the housing 7.
By being rotatably supported by a and 7b, it is rotatably installed with the same axis as the axis of the housing 7.

A bevel gear 10 is fixed to one of the support shafts 9a of the rotating body 8, and the bevel gear 10 is
The bevel gear 10 at the tip of a transmission shaft 11 that is inserted into the operation pipe 6 and transmits the rotational output of the engine 3 is meshed with the operation shaft 6. As a result, when the rotational speed of the engine 3 is increased and the centrifugal clutch is connected and the transmission shaft 11 is rotationally driven, this rotational force is transmitted through the two bevel gears 10 and 12 to the rotating body 8 in the housing. Will be transmitted to.

As shown in FIGS. 2 and 3, the rotating body 8 has a balance weight function between the pair of left and right flange portions 8a and 8b from which the respective support shafts 9a and 9b are projected from the side surfaces. It has a form in which it is integrated by a columnar connecting portion 8c having the above. As shown in FIG. 3, the flange portions 8a of the rotating body 8 are
8b includes the connecting portion 8c with the rotation axis of the rotating body 8 interposed therebetween.
Holding holes 13, 13 having the same shape are respectively formed on the opposite side. Both ends of the cylindrical roller 14 are loosely inserted and held in the holding holes 13 and 13. That is, the holding holes 13 and 13 are formed so that the roller 14 is allowed to play. In the present embodiment, the holding holes 13 and 13 have a minimum curvature of the inner surface of the roller 14 that is substantially equal to the circumference of the roller 14. It has an oval shape that matches the curvature of. The major axes of the oblong holding holes 13 and 13 are set in the radial direction extending from the rotation axis of the rotary body 8 as shown in FIG.

Therefore, the roller 14 has the holding hole 1
It can freely rotate in a state where both ends are restrained by 3 and 13, and can also play in the radial direction of the rotating body 8 within a range allowed by the gap between the inner surfaces of the holding holes 13 and 13.

Left and right side walls 7a, 7b of the housing 7
Donut disk-shaped guide plates 15, 15 are attached to the inner surface of the roller 14, and the guide plate 15 is in operation.
The axial movement of is restricted.

At the lower end of the housing 7, a holder portion 16 for holding a shank portion 5a of a root cutting blade 5 described later so as to be capable of reciprocating a fixed distance in the axial direction is formed.

In the present embodiment, an intermediate hammer body 17 is interposed between the shank portion 5a of the root cutting blade body 5 and the roller 14 acting as the impact mechanism 4 for impact. This intermediate hammer body 17 is also
It is held in the holder portion 16 so as to be movable in the axial direction.

The intermediate hammer body 17 penetrates the outer peripheral wall 7c of the housing 7 so as to penetrate the housing 7.
It is held by a boss-shaped first holder portion 16a which is connected and fixed to. The shank portion 5a of the root cutting blade body 5 is held by a boss-shaped second holder portion 16b connected to the first holder portion 16a.

The intermediate hammer body 17 has a generally cylindrical shape, and therefore, the intermediate hammer body 17 can be pivoted in the first holder portion 16a. A large-diameter flange 17a is formed at the lower end of the intermediate hammer body 17, and the large-diameter flange 17a is a large-diameter hole formed in the connecting portion between the first holder portion 16a and the second holder portion 16b. By being regulated by the upper and lower step portions 18a and 18b of 18, the moving distance in the axial direction is regulated to be constant.

The shank portion 5a of the root cutting blade 5
Forms a recess 19 on its side surface over a predetermined length in the axial direction, and the stopper pin 2 passing through this recess 19
By holding 0 in the second holder portion 16b in the lateral direction, the rotation is regulated and the axial movement distance is regulated to be constant. Further, the rotation and movement distance regulating means by the concave portion 19 and the stopper pin 20 also has a function of preventing the shank portion 5a of the root cutting blade body 5 from coming off.

The top surface 17b of the intermediate hammer body 17 is formed as a flat surface as shown in FIG. 2 and FIG. 3, and the top surface 17b is provided with a buffer hole 21 in the axial direction. It is formed to a depth.

Further, the upper end position of the movable stroke of the intermediate hammer body 17 is defined as follows.

That is, as shown in FIG. 2 and FIG.
When the intermediate hammer body 17 is at the upper end of its movable stroke, the flat top surface 17b interferes with the outermost periphery of the turning trajectory of the roller 14 as the rotor 8 of the impact mechanism rotates. Is done. In the state shown in FIG. 3, the outermost circumference of the turning trajectory of the roller 14 most effectively interferes with the top surface 17b of the intermediate hammer body 17. That is, if the position of the intermediate hammer body 17 is higher than the position shown in FIG. 3, the peripheral surface of the roller 14 is not the top surface 17b of the intermediate hammer body 17 but the top surface 17b and the side surface. There will be a problem of collision with the corners of the. Further, when the position of the intermediate hammer body 17 is lower than the position shown in FIG. 3, the peripheral surface of the roller 14 collides with the portion inward from the edge of the top surface 17b for the first time. Due to the collision of the rollers 14 and the centrifugal force, the force for pressing down the intermediate hammer body 17 with an impact force is insufficient.

Inside the housing 7, the bearing portion for the rotating body 8 is lubricated, the intermediate hammer body 17 in the holder portion 16 and the shank portion 5a of the root cutting blade body 5 in the axial direction. Lubrication for sliding, lubrication at the contact portion between the top surface 17b of the intermediate hammer body 17 and the roller 14, and sliding lubrication of the cylindrical roller 14 with respect to the inner peripheral surfaces of the holding holes 13, 13 of the rotating body 8. An appropriate amount of lubricant for performing the above is added.

In FIG. 1, reference numeral 22 is expanded and expanded so as to sandwich the engine 3 while being fixedly connected to both sides of a clutch housing 23 for a centrifugal clutch which is formed at a connecting portion between the operation tube 6 and the engine 3. And a reference numeral 24 indicates a rear handle formed by connecting a pair of arm portions extending upward while being connected by an axial grip member.
3 shows a grip handle including a mounting rod fitted to the outer periphery of the operation tube 6 and a grip portion formed to project laterally from the mounting rod. Further, reference numeral 25 indicates a throttle operating lever for controlling the rotation of the engine 3.

Next, as described above, the second holder portion 16
The root cutting blade body 5 of the present invention in which the shank portion 5a is held by b is characterized in terms of form as follows.

That is, in the first example of the root cutting blade 5, as shown in FIG. 4, the plate-shaped blade portion 5b integrally extended to the lower portion of the shank portion 5a is formed in the longitudinal direction. It is a strip having a constant width over almost the entire length. And, as is clear from FIG. 5, the plate-shaped blade portion 5b is extended in a flat plate shape including the axis of the shank portion 5a.

The length of the plate-shaped blade portion 5b is set to a length corresponding to a root cutting depth for securing a root excavation amount necessary for rooting and growing after transplantation of a corresponding plant. . Specifically, when a plant is dug up and transplanted to another place, the amount of dug up at the root of the plant must be sufficient so that rooting and growth can be performed well after transplantation. Therefore, the root cutting depth from the ground surface is determined in advance so that an appropriate root excavation amount that is determined according to the type of plant and root depth can be obtained, and it corresponds to this root cutting depth. The length of the plate-shaped blade portion 5b is set so as to be the length.

In this first example, root cutting from the ground surface G shown in FIG. 4 is carried out in order to obtain an appropriate amount of dug up of a relatively small tree used for landscaping among trees. Acknowledging that it is preferable to set the depth a to 30 to 50 cm, the plate-shaped blade portion 5 is
The length of b is also set to 30 to 50 cm. It is more preferable to appropriately change the length of the plate-shaped blade portion 5b according to the type of tree and the depth of the root,
The value may be set to a predetermined value within the above-mentioned dimensional range of 30 to 50 cm so that the rooting and the growth may not be hindered.

Further, the lower end portion of the plate-shaped blade portion 5b is shown in FIG.
As shown in, it is preferable to form a straight line,
In order to more effectively perform the root cutting action described later, it is desirable to form it in a wedge shape in section as shown in FIG.

On the other hand, a second example of the root cutting blade 5 is, as shown in FIG. 7, formed on both side edges of a plate-shaped blade portion 5b integrally formed under the shank portion 5a. The tapered portions 5c and 5c are formed such that the width of the plate-shaped blade portion 5b becomes narrower as it moves to the base end side (upper side in the drawing). The tapered portions 5c, 5c are formed over substantially the entire length of both side edges of the plate-shaped blade portion 5b.
Specifically, the tip portions of both side edges of the plate-shaped blade portion 5b are non-tapered portions 5d, 5d, and the sides 5e, 5e on the base end side of the plate-shaped blade portion 5b reach the non-tapered portions 5d, 5d. The portions are the tapered portions 5c and 5c.

Further, as shown in FIGS. 7 and 8, the shank portion 5a has a recess 19 at the base end thereof.
The diameter is gradually reduced as it moves from the formed hexagonal column portion 5f to the tip side, whereby the resistance when the root cutting blade 5 enters the soil is reduced.

Also in the second example of the root cutting blade 5, the root cutting depth corresponding to the appropriate excavation amount of a relatively small tree used for landscaping or the like is set,
You may set the length of the plate-shaped blade part 5b to 30 to 50 cm. In this case, the plate-shaped blade portion 5b has the tapered portions 5c, 5
Since the c is formed, the length of the plate-shaped blade portion 5b may be shorter than the above-mentioned set value by about 10 cm, for example. The length a of the plate-shaped blade portion 5b in the illustrated example is about 30 ± 5 cm, and the width b of the tip end portion of the plate-shaped blade portion 5b is about 16 ± 5 cm.

The taper portions 5c, 5c are preferably formed as shown by the solid line in FIG. 7, but the angle formed by the axis of the shank portion 5a and the taper portions 5c, 5c is compared with the illustrated example. As long as it does not become so large, for example, the form shown by the chain line in the figure may be used.

Next, the operation of the root cutting machine 1 having the above structure will be described.

The operator holds the rear handle 22 with the right hand and holds the grip handle 24 with the left hand to support the root cutting machine 1 as a whole, and the tip of the root cutting blade 5 is transplanted. Make sure to hit the ground at a distance from the root of the plant to be planted. In this way, when the root cutting blade 5 is abutted on the ground, the shank portion 5a of the root cutting blade 5 or the intermediate hammer body 17 positioned above the shank portion 5a is, as shown in FIGS. 2 and 3, It is located at the top of the travel process.

In this state, the throttle control lever 2
When 5 is operated to gradually increase the rotation speed of the engine 3, the centrifugal clutch is actuated and the rotation output of the engine is transmitted to the rotating body 8 in the housing 7 via the transmission shaft 11. When the rotating body 8 is rotated at a high speed in this manner, the roller 14 causes the intermediate hammer body 17 to rotate at each turn.
The impact force in the axial direction of the intermediate hammer body 17 repeatedly and continuously acts on the intermediate hammer body 17 due to the impact force and the centrifugal force caused by the impact.

As a result, a continuous axial impact force is repeatedly applied to the shank portion 5a of the root cutting blade 5 via the intermediate hammer body 17, whereby the weight of the whole root cutting machine 1 is increased. Coupled with this, the blade body 5 is gradually driven into the soil. In the process of being driven into the soil in this way, the root cutting blade 5 effectively cuts the root radially extending from the root of the plant to be transplanted.

On the other hand, when the root cutting blade 5 is not brought into contact with the ground, the shank portion 5a of the root cutting blade 5 is positioned at the lower end of its movable stroke and locked. In this case, The top surface 17b of the intermediate hammer body 17 is located outside the outermost circumference of the turning trajectory of the roller 14, and no impact force acts on the intermediate hammer body 17 or the root cutting blade body 5. As described above, since the rotating body 8 includes the connecting portion 8c having a function as a balance weight, the center of gravity in the rotating state substantially coincides with the rotating shaft center. Even if the engine 3 is rotating at high speed, the root cutting blade 5
As long as it is not abutted against the ground surface, the rotor 8 in the housing 7 hardly vibrates due to the rotation thereof.

As can be seen from the above, according to the root-cutting machine 1 of the present invention, the power for causing the root-cutting blade body 5 to perform the root-cutting operation is obtained from the power source such as the engine. During the root-cutting operation, the operator only needs to hold the root-cutting machine in a predetermined posture and apply a slightly downward force, which is much more labor-intensive than using a conventional general manual tool such as a scoop. It will be reduced.

In the root cutting operation as described above, the plate-shaped blade portion 5b which enters the soil is the tip portion which is not narrow in both the first and second examples shown in FIGS. 4 and 7. Since the root is cut by this, the root is cut with the maximum width of the plate-shaped blade portion 5b, and the cutting work is performed more efficiently than, for example, a scoop having a narrow tip. Therefore, when the root cutting blade body 5 is pulled out, the plate-shaped blade portion 5
b will pass through the cutting point of the root, and the extraction work will be relatively smooth compared with the case where the cutting of the root is not reliably performed as in the case of using a blade body with a narrow tip. .

Further, in the second example shown in FIG. 7, since the plate-shaped blade portion 5b is formed with the taper portions 5c, 5c, it can be pulled out after passing through the portion where the root remains. Even if there is, the remaining roots are pushed out by the action of the taper portions 5c, 5c while being pulled out, and the roots are appropriately prevented from being caught by the plate-shaped blade portion 5b. In addition, by forming the tapered portions 5c and 5c in this way, the plate-shaped blade portion 5b becomes lighter in weight than the strip-shaped blade portion 5b, and thus the root cutting blade body 5 for the impact mechanism 4 described above is reduced in weight. The followability is improved, the output of the engine 3 is reduced, and the rotating body 8, the roller 14 and the intermediate hammer body 17 are
It is possible to reduce the size.

Further, both of the above first and second examples,
Further effects can be obtained by setting the length of the plate-shaped blade portion 5b to a length corresponding to the root cutting depth according to the root excavation amount necessary for rooting and growing after transplantation. That is, while the plate-shaped blade portion 5b is driven into the soil while cutting the root at the tip portion thereof, immediately before the base end of the plate-shaped blade portion 5b is completely buried in the soil. If the driving is stopped, this stop position corresponds to the optimum amount of excavation. Since the plate-shaped blade portion 5b is not completely buried in the soil at the time of this stop, the possibility that the root is caught at the base end side portion of the plate-shaped blade portion 5b at the time of extraction is completely eliminated. Also,
Since the collapse of soil can be prevented as much as possible, it is extremely convenient for digging up the root of a plant to be transplanted together with a certain amount of soil.

As a result, according to the root-cutting machine of the present invention, when transplanting a plant, the work of excavating the root part of the plant together with a certain amount of soil can be performed smoothly and properly with low labor. Become.

Further, if the integrally mounted engine is used as the power source for operating the impact mechanism as in the above-mentioned embodiment, the rooting machine of the present invention can be easily brought into the forest. The convenience is significantly increased.

Of course, the scope of the present invention is not limited to the above embodiments. The present invention is characterized in particular by the form of the root cutting blade 5 to be attached to the root cutting machine main body 1, and therefore the impact mechanism 4 to be built in the main body.
The specific configuration of is not limited to the rotary hammer type impact mechanism as described above, and a reciprocating drive type impact mechanism may be adopted. In addition to using the engine as the power source, it is also possible to use an electric motor.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a root cutting machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, showing the details of the impact mechanism of the root cutting machine.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view showing an example of a root cutting blade used in the root cutting machine.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a front view showing another example of a root cutting blade used in the root cutting machine.

FIG. 8 is a side view showing another example of the root cutting blade.

[Explanation of symbols]

 1 Root Cutting Machine 2 Main Body 4 Impact Mechanism 5 Root Cutting Blade 5a Shank Part 5b Plate Blade 5c Tapered Part

Claims (6)

[Claims] 1. A root-cutting machine comprising a main body having a built-in impact mechanism, and a root-cutting blade body supported by the main body and operated upon receiving an impact from the impact mechanism, wherein the root-cutting blade body comprises: A shank portion supported so as to be reciprocally driven by a predetermined distance in the axial direction with respect to the main body, and a plate-like blade portion extending in a strip shape with a predetermined width so as to include an axis of the shank portion at a lower portion of the shank portion. A root cutting machine, which is characterized in that it is formed including. 2. A root cutting machine, comprising: a main body having a built-in impact mechanism; and a root cutting blade supported by the main body, which is actuated by the impact of the impact mechanism. The shank portion is supported so as to be reciprocally driven by a predetermined distance in the axial direction with respect to the main body, and a plate-shaped blade portion that extends so as to include the axis of the shank portion is provided under the shank portion. The root cutting machine is characterized in that tapered portions are formed on both side edges of the blade portion so that the width of the plate blade portion becomes narrower as it moves to the base end side. 3. The length of the plate-shaped blade portion of the root cutting blade is set to a length corresponding to a root cutting depth for securing a root excavation amount necessary for rooting and growing after transplantation. The root cutting machine according to claim 1 or 2, which is characterized by being provided. 4. The root-cutting machine according to claim 2, wherein the tapered portion is formed over substantially the entire length of both side edges of the plate-shaped blade portion of the root-cutting blade body. 5. A shank portion, and a plate-shaped blade portion extending in a strip shape with a predetermined width so as to include an axis of the shank portion at a lower portion of the shank portion. A root cutting blade used for the root cutting machine according to claim 1. 6. A shank portion, and a plate-shaped blade portion extending below the shank portion so as to include the axis of the shank portion, the plate-shaped blade portion being provided on both side edges of the plate-shaped blade portion. The root-cutting blade body used in the root-cutting machine according to claim 2, wherein the tapered portion is formed so that the width of the blade portion becomes narrower as it moves to the base end side.