KR20150105093A - Cutting Blade and Cutting Device for Grass Eliminator - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a metal cutting blade used for a lawn mowing machine and a cutting device for lawn mower applying the same. The cutter blade 1 for lawn mower according to the present invention has a shaft hole 11 into which the rotary shaft 4 of the lawn mower 3 is inserted at the center and has the same shape of a blade portion 12) are formed in an even size along the circumference of 5 to 8 pieces; Each of the blade portions 12 has a root portion 12a having a shortest radius R1 and a peak portion 12b having a longest radius R2 on the side of the other blade portion 12b adjacent to the peaks 12b A curved blade portion 12d gradually increasing in radius from the root portion 12a to the peak portion 12b and gradually increasing in radius from the root portion 12a to the root portion 12a, And a plurality of teeth 12e formed along the curved blade portion 12d.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cutting blade for a grass cutter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lawn mowing machine, and more particularly, to a cutting blade made of a metal material used in a lawn mowing machine and a lawn mower cutting device using the same.

The grass cutter widely used for cutting grass or small shrubs generally includes a driving device for generating power, a power transmitting device for transmitting rotational force from the driving device, and a handle and a switch And a cutting device which is detachably assembled to the rotary shaft of the power transmission device and directly cuts grass or small shrubs.

Cutting devices for lawn mowing machines can generally be divided into metal cutting blades and plastic synthetic resin material (e.g., nylon) wires (rope, string, and string). Electrically cutting blades include straight blade cutting blades, Saw blade cutting blade and the like.

Korean Patent Laid-Open No. 10-2010-0064730 (lawn mower equipped with a chain blade: straight blade and chain blade cutting blade) disclosed in Korean Patent No. 10 Korean Patent No. 10-1345034 (Lawn mower blade: straight cutting blade), Korean Patent No. 10-1032898 (Cutting unit for lawn mower: saw blade, Korean Patent No. 10-1187290 (cutting unit for cutting grass cutter capable of cutting various kinds of cutter while being able to cut bare grass: saw-blade cutting blade and wire), Korean Patent Laid-Open No. 10-2013 -0035636 (lawnmower: wire), registered in the Republic of Korea Utility model 20-0207294 (interchangeable mowing blade: cross-cutting blade), Korea registered utility model 20-0246106 (interchangeable mowing blade and blade: The cutting edge), and the like Republic of Korea Registered Utility Model No. 20-0253016 call (line-type and blade-type cutting blade).

The cutter for cutter blades exerts a strong shear force (cutting force) enough to cut even relatively hard shrubs along with the barren grass, but a straight blade or a square blade cuts the blade during the mowing operation In the event of encountering a hard obstacle, not only does the blade break, but also a strong impact is transmitted to the wrist of the worker, and even a safety accident such as a broken stone or a broken blade splashes the worker or people around him .

The sawtooth-type cutting blades may considerably reduce the aforementioned safety hazards such as straight blade cutting blades or square cutting blades, but may be said to cut into saw blades rather than cutting them, so that the shear force of the soft blades may be unsatisfactory, Frequent breakage and maintenance of many small saw teeth can be a problem.

The flexible plastic synthetic resin wire has a merit of significantly reducing the safety accidents caused by the cutting edge, but there is no problem in cutting the soft grass, but there is a limitation in that the shearing force against the strong grass is weak and cutting of the shrubbery is almost impossible .

The above-mentioned patents 10-1032898 and 10-1187290 propose a cutting device for a compound lawn mower which can be used by replacing the cutting blade and the wire as necessary or in some cases can be used together. However, such complex cutting apparatuses still use conventional cutting blades such as saw blades as they are, and therefore, they contain a considerable part of the problem of having a cutting blade made of a metal material.

The inventor of the present invention has made various studies on a cutting edge of a mowing machine cutting device capable of alleviating the above-mentioned various problems that may occur in a mowing operation, and as a result, the present invention has been completed.

SUMMARY OF THE INVENTION It is an object of the present invention to alleviate the above-described problems of a metal cutting blade used in a cutting device of a grass cutter, and it is an object of the present invention to provide a cutting device, It is an object of the present invention to provide a cutting blade for lawn mower and a cutting device for lawn mower using the lawn mower which can reduce the safety incidents of lawn mowing operation by reducing impact, will be.

It is another object of the present invention to provide a cutting blade according to the present invention in which a cutting blade according to the present invention is integrally formed with a wire so as to provide a universal usable grass mower for various mowing work areas having various different characteristics such as a soft grass, And to provide a cutting device for a cutting tool.

It is still another object of the present invention to provide a cutter for a grass cutter having a cutting blade and a wire integrally formed thereon according to the present invention, And it is an object of the present invention to provide a cutter for lawn mower which minimizes the shortening of the life of the wire due to the force applied to the wire during the mowing operation.

According to the present invention, a cutting blade for lawn mower is provided.

The cutting blade for lawn mower according to the present invention is characterized in that a shaft hole into which a rotary shaft of a lawn mower is inserted is formed at the center and 5 to 8 pieces of equal size are formed along the circumference of the same- Includes cutting blade.

Wherein each of the blade portions of the cutting blade has a root portion having a shortest radius, a peak portion having a longest radius, a vertical portion connected to the root portion of another adjacent blade portion in the peak portion, And a plurality of teeth formed along the curved blade portion. The plurality of teeth of the curved blade portion gradually increases in radius. *

According to the present invention, a cutter for lawn mowers is provided.

The cutting device for lawn mower according to the present invention includes the cutting blade, the winding plate and the wire according to the present invention.

Wherein the take-up plate is formed at a central position corresponding to the shaft hole of the cutting blade and is engaged with a shaft hole into which the rotation shaft of the grass blade is inserted and a center between the cutting blade and the cutting blade, And a reel portion formed in the space.

The wire is wound several times around the reel portion so that both ends are drawn out to the outside.

The cutting device for lawn mower according to the present invention may include a wire loop formed by cutting out a point on the outer periphery of the winding plate. At this time, the wire is hooked to the wire loop approximately at an intermediate point, and both sides of the wire are wound around the reel portion in the same direction and mounted.

The cutting device for lawn mowers according to the present invention may include two, four or six resilient partition plates which are elongated at regular intervals along the outer periphery of the winding plate on the surface facing the cutting blade .

Each of the partition plates includes a fixing portion fixed to the winding plate, a partition portion extending from the fixing portion and elastically contacting the cutting blade plate across the reel portion at an oblique angle, and a portion elastically contacting the cutting blade plate And a button hole capable of pressing the push button can be formed on the cutting blade at a position corresponding to the push button on the opposite side of the take-up plate.

Wherein each of the partition plates includes a fixing portion fixed to the winding plate, a partition portion extending from the fixing portion and elastically contacting the cutting blade plate across the reel portion at an oblique angle, And a wire seating part formed in the partition adjacent to the fixing part so as to form a space to be inserted in a space.

The cutting blade for lawn mower according to the present invention is a curved line whose radius gradually increases from the root portion to the end portion which is the starting portion of the curved blade portion formed in the blade portions of the cutting blade, It is possible to disperse the collision resistance generated when cutting or when colliding with the rigid obstacle, and the degree of scattering of stones due to collision can be mitigated.

Since the teeth of the curved blade portion are arranged inwardly of the peaks of the longest radius in the cutting blade for lawn mower according to the present invention, the peak portion collides with a rigid obstacle such as a stone at the time of mowing operation, It is possible to reduce the damage of the teeth due to the collision with the obstacle.

The cutting device for lawn mowers according to the present invention can not only enjoy the effect of the cutting blade for lawn mowers according to the present invention, but also can cut the grass softly with the wire, It is possible to cut a heavy grass or a branch of a hedge which is not cut well by the grass or the wire, so that it is possible to effectively perform a mowing operation using only one grass mower for various mowing areas having various different characteristics have.

The cutting device for lawn mower according to the present invention can conveniently wind the wire on the reel portion and mount it using the wire loop formed on the winding plate.

The cutter for lawn mower according to the present invention is characterized in that when the end of the wire exposed to the outside is worn by the action of the partition plate, the push button and the buttonhole, the wire wound around the reel is easily You can use it by unpacking it.

The cutter for lawn mower according to the present invention can reduce the damage of the wire which can be caused by the interference of the wire in a narrow gap of the triangle according to the action of the wire seating part formed on the partition plate.

1 is a perspective view of an exemplary cutting blade according to the present invention,
Figure 2 is a top view of an exemplary cutting blade according to the present invention,
3 is a cross-sectional view of an exemplary cutting edge according to the present invention,
Figure 4 is a perspective view of the use of an exemplary cutting apparatus according to the present invention,
5 is an exploded perspective view of an exemplary cutting apparatus according to the present invention,
Figure 6 is an exploded view of an exemplary cutting apparatus according to the present invention,
FIG. 7 is a schematic sectional view showing the use state of an exemplary cutting apparatus according to the present invention,
8 is a schematic view of a partition plate applied to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cutting blade and a cutting apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The following examples are illustrative of the present invention but are not intended to limit the scope of the present invention.

The cutting blade and cutting device according to the present invention is a cutting device equipped with a cutting blade which is detachably mounted on a rotary shaft of a mower and which rotates at a high speed by a rotary shaft of the mower, thereby cutting grass and shrubs.

First, the cutting edge 1 according to the present invention will be described.

As shown in Figs. 1 to 3, the cutting blade 1 according to the present invention includes a front end blade 10.

The cutting blade 10 includes a shaft hole 11 and a plurality of blade portions 12 as a rotatable member, for example, a disk-like member (a plate-shaped member based on a circular shape rather than a completely circular shape).

The shaft hole 11 is a hole of a predetermined size formed at the center of the cutting blade 10. [ The cutting blade 10 rotates integrally with the rotary shaft 4 by inserting and fixing the rotary shaft 4 of the lawn mower 3 into the shaft hole 11 as shown in Figs. In the illustrated embodiment, the cutting blade 10 rotates in a counterclockwise direction (the direction of the arrow in Fig. 4) and is rotated about the rotation axis 4 using a nut 5, a washer 6, It can be detachably fixed.

A plurality of the blade portions 12 are uniformly formed on the outer side along the circumference of the cutting blade 10, and each of the blade portions 12 has the same shape as the center angle? Of the same size. That is, the cutting blade 10 has a shape in which blade portions 12 (e.g., six) having the same shape are formed radially like wings of a vane.

The number of the blade portions 12 may be five to eight on the cutting blade 10, and preferably six as shown in the figure. In the following description of the cutting blade 1 of the present invention, the case where the blade 12 of the cutting blade 10 is six will be described as an example.

Each of the blade portions 12 is formed in the same shape corresponding to six arcs having a central angle of 60 degrees and each blade portion 12 has a root portion 12a, A peak portion 12b, a vertical portion 12c, a curved blade portion 12d, and a tooth 12e.

The root portion 12a is a portion of one side of the blade portion 12 having the shortest radius R1 from the center of the shaft hole 11.

The peak portion 12b is the other side portion of the blade portion 12 having the longest radius R2 from the center of the shaft hole 11. In the illustrated embodiment, the peak portion 12b is formed at a position rotated clockwise from the root portion 12a by 60 degrees.

The vertical portion 12c is a vertical portion connected to the root portion 12a of another adjacent blade portion 12 in the peak portion 12b of one blade portion 12. [ At this time, the angle of the vertical portion 12c does not necessarily mean an absolute vertical passing through the center of the cutting blade 10, but may be a vertical or slightly gentle slope passing through the center of the cutting blade 10 have.

The curved blade portion 12d is a curved portion whose radius gradually increases gradually from the root portion 12a to the peak portion 12b gradually increasing and is an outer peripheral blade portion that directly cuts grass and shrubs.

The size of the front end blade 10 can be set according to the use of the cutting blade 1 according to the present invention. However, as a preferred example, the shortest radius R1 connecting the two root portions 12a located on the diagonal line, Is approximately 70 mm, and the longest radius R2 connecting the two peak portions 12b located on the diagonal line is approximately 95 mm. Therefore, in the cutting blade 10 of this embodiment, the curved blade portion 12d of each blade 12 increases in radius by 25 mm from the root portion 12a to the peak portion 12b by 60 degrees, (The slope of the tangent becomes smaller).

When the lower end of the vertical portion 12c of the adjacent two blade portions 12 and the root portion 12a are connected by a soft curved line as shown in the illustrated embodiment, the shrubs or the like, And the like.

A plurality of teeth 12e are continuously formed along the curved blade portion 12d. In the specific example shown in Fig. 2 and the like, no sawtooth is formed over a predetermined length at the beginning of the curved blade portion 12d adjacent to the root portion 12a, and a plurality of teeth (e.g., about 7 teeth) The present invention is not limited to this example in which only one valley is formed on the end portion of the curved blade portion 12d adjacent to the peak portion 12b without forming teeth again over a predetermined length, Teeth may be formed over the entire curved blade portion 12d.

However, according to the test by the inventors of the present invention, the shear force applied to the shrub or the like at the beginning of the curved blade portion 12d is relatively weak, so that it is not necessary to form the teeth, and the shrub, So that no saw tooth is formed at the starting point. The reason why only one valley is formed without forming a tooth at the end of the curved blade portion 12d is believed to be useful for alleviating excessive excessive shearing force applied at the portion of the longest radius R2.

Although the teeth 12e can be basically formed in a substantially isosceles triangle shape, the inclination of the side located relatively to the root portion 12a is formed abruptly and the inclination of the side located on the side of the peak portion 12b is formed gently, It is possible to have a large shearing force.

The cutting blade 1 according to the present invention described above is characterized in that firstly the curved blade portion 12d is curved in which the radius gradually increases from the root portion 12a as the starting portion to the peak portion 12b as the end portion It is possible not only to disperse the impact resistance when cutting a shrub or the like or to collide with a rigid obstacle, but also to reduce the degree of scattering of stones due to collision, and secondly, when the teeth 12e of the curved blade portion 12d Is arranged inside the peak portion 12b of the longest radius R2 so that the peak portion 12b first collides with a rigid obstacle such as a stone at the time of mowing operation so that the damage of the teeth due to the rigid obstacle can be reduced .

For example, a circular raised portion 13 protruding (raised) at the center of one side can be formed on the cutting edge plate 10 by, for example, pressing, (2) will be described again.

Next, a cutting apparatus for lawn mower (2) according to the present invention will be described.

4 to 8, the lawn mower cutting apparatus 2 according to the present invention includes a cutting blade 1 having the above-described cutting blade 1 of the present invention, Device.

The cutting apparatus 2 of the present invention basically includes the cutting blade 1 and the winding plate 20 and the wire 30 together. Here, since the cutting blade 1 of the present invention is applied as it is, the description of the cutting blade 1 is omitted here.

The winding plate 20 is a rotatable member, for example, a disk-like member firmly assembled to the cutting blade 1 by a rivet or the like, and cooperates with the cutting blade 1 to wind the wire 30, In a diagonal direction by an appropriate length.

The winding plate 20 has a radius (R3: Fig. 6) to such an extent that the blade 12 of the cutting blade 10 can be exposed. That is, the radius R3 of the wind-up plate 20 can be set to be slightly smaller than the shortest radius R1 of the blade 12.

The wind-up plate 20 includes a shaft hole 21 and a reel portion 23 and optionally a raised portion 22.

The rotary shaft 4 of the lawn mower 3 is inserted through the shaft holes 11 and 21 so that the rotary shaft 4 is inserted through the shaft holes 11 and 21, And the cutting blade 1 and the winding plate 20, which are combined into one, are integrally rotated by the rotating shaft 110.

The raised portion 22 may be formed in the center of one side of the take-up plate 20 by, for example, protruding (protruding) in a circular shape. As described above, the cutting blade 10 can be provided with the raised portion 13 like the raised portion 22 of the take-up plate 20, and the cutting blade 10 and the take- The bases 13 and 22 are coupled to each other by rivets or the like.

This reel 23 is formed between the plates by means of a combination of the winding plate 20 and the raised portions 13 and 22 of the cutting blade 10 so as to form a ring- And the wire 30 can be wound around the reel part 23 as described later.

If the reel portion 23 is formed between the cutting blade 10 and the take-up plate 20 when the raised portions 13 and 22 are formed on the cutting blade 10 and the take-up blade 20, It is possible to form a large portion and to form or omit the raised portion of the other side.

The illustrated embodiment shows an example in which the raised portions 13 and 22 are integrally formed at the center of the cutting blade 10 and the wound blade 20 by the pressing process. And a reel plate (not shown) having a radius and a thickness enough to form the reel portion 23 between the both plates 10 and 20 is inserted into the plate 20, The reel unit 23 can be formed between the cutting blade 10 and the winder plate 20 by combining the winder 10, the winder plate 20 and the reel plate with a rivet or the like.

The wire 30 is a string of flexible plastic synthetic resin (e.g., nylon) suitable for cutting a grass, for example, as is conventionally known. The wire 30 is wound around the reel 23 at both ends 31 are wound so as to be drawn out to the outside at the diagonal positions.

A wire loop (24) can be formed on the winding plate (20). As shown in FIG. 5, the wire loop 24 may be formed by cutting a point around the outer periphery of the take-up plate 20 and bending it so as to protrude. The wire 30 is wound around the wire 23 by a wire 24 and wound on the reel 23 several times in the same direction between the cutting blade 10 and the winding plate 20.

The cutting apparatus (2) of the present invention may further include a partition plate (25).

6 and the like, the partition plate 25 is a long elongated plate-like member having resilient elasticity and is arranged at an angle of 180 degrees along the outer circumference of the wind-up plate 20 on the side facing the cutting blade 10 Two at 90 degree intervals, or four at 60 degree intervals. The specific example shown in Fig. 6 and the like shows an example in which four partition plates 25 are provided, and the following description will focus on this specific example in which the partition plate 25 is four.

6 and 8, each of the partition plates 25 has a fixed portion 25a on one side fixed to the take-up plate 20 by a rivet or the like and a long portion 25b extending from the fixed portion 25a, 23 at an oblique angle so as to elastically contact the cutting blade 10.

In the illustrated embodiment in which the four partition plates 25 are arranged in an annular arrangement at intervals of 90 degrees around the winding plate 20, by the action of these four partition plates 25, And both end portions 31 of the wire 30 wound around the reel portion 23 are respectively drawn toward the diagonally located space having a phase difference of 180 degrees.

The partition plate 25 is positioned across the reel unit 23 at an oblique angle and one fixing portion 25a is fixed to the wind plate 20 while the other partition 25b is resiliently attached to the cutting blade 10 The wire 30 is unintentionally pulled out by the isolation action of the partition plate 25 if the end portion 31 of the wire 30 is pulled out to any one of the four divided spaces of the reel unit 23, (23), or the withdrawal position is not changed to another adjacent space.

When the wire 30 is worn or cut to an extent that is inadequate for mowing operations due to continuous use, the cutting blade 10 of the partition plate 25 located on the side where the wire 30 is unwound is elastically A gap is generated between the cutting edge plate 10 and the partitioning portion 25b and the wire 30 is pressed into the gap by pressing the contacted partitioning portion 25b toward the take-up plate 20 with a force enough to overcome the elasticity thereof. The exposed length of the wire end portion 31 becomes longer by 90 degrees, while the wire withdrawing position moves 90 degrees (90 degrees in the clockwise direction in the illustrated example) by passing the end portion 31 of the wire, In this state, when the pressing force on the partition 25b is lost, the partition 25b is resiliently brought into contact with the cutting blade 10 again so that the wire 30 is prevented from being unintentionally loosened again, According to the above-described series of methods, Releasing the side edge 31 to 90 degrees from rilbu 23 to use the length of the side end portions 31 may be adjusted to an appropriate length.

In the case where two or six partition plates 25 are formed, it is substantially the same as the case of four except that the end portion 31 of the wire 30 is unwound in units of 180 degrees or 60 degrees at a time.

The work of loosening the wire 30 from the reel portion 23 is an operation for pressing the elastic partition 25b toward the winding plate 20 through the narrow space between the cutting blade 10 and the winding plate 20 A push button 25c may be formed on the partition plate 25 and a button hole 14 may be formed on the cutting edge plate 10. [

The push button 25c is formed in such a manner that the push button 25c is convex upward at a portion resiliently contacting the cutting blade 10 of the partition 25a and the button hole 14 is formed at a position corresponding to the push button 25c It is possible to form the cutting blade 10 on the cutting blade 20 so as to press the push button 25c on the opposite side of the take-up blade 20.

When the push button 25c is pushed with the finger through the button hole 14, the partition 25b is elastically downwardly displaced and the cutting blade 10 is pulled out of the cut- A clearance is formed between the partition portion 25b and the partition 25b and when the pressing is removed, the gap is eliminated by the resilient return to the original position of the partition portion 25b, so that the operation of unfastening the wire 30 from the reel portion 23 is easily carried out .

In the cutting apparatus 2 according to the present invention, when the wire 30 is wound around the reel 23, the wire 30 comes closer to the cutting blade 10 from the side where the partition 25b is wide, Since the partition portion 25b passes while pressing the portion elastically contacted forcibly downward, the wire can be wound as it is without pressing the push button 25c with the finger.

The partition 25b of the partition plate 25 is located at an oblique angle between the wind-up plate 20 and the cutting blade 10 so that a narrow triangular gap is formed at the position where the partition plate 25 and the wind-up plate 20 meet , When the cutting apparatus 2 of the present invention rotates at a high speed, the wire 30 is subjected to a force to move to the position where the fixing portion 25a is present due to the rotational force and the centrifugal force, and is caught in the triangular gap. When the wire is continuously subjected to the force, the wear and cutting of the wire 30 can be promoted at the portion in the triangular gap.

In order to prevent such wire 30 from being damaged, a wire seating portion 25d may be formed in the partition plate 25 as shown in Fig. The wire seating portion 25d can be formed by bending the partition portion 25b adjacent to the fixing portion 25a so that the space between the winding plate 20 and the partition portion 25b at the position of the fixing portion 25a It is possible to provide a sufficient space for allowing the wire 30 to be inserted in a space other than the gap of the triangular shape. As a result, wire damage due to the triangular gap can be reduced. When the partition plate 25 is bent to form the wire seating portion 25d, the surface contacting the wire 30 can be bent so as to have a convex smooth curve.

8, when the fixed portion 25a of the partition plate 25 is engaged with the take-up plate 20, the wire receiving portion 25d is formed by bending the partition portion 25b, It is also possible to form the wire seating portion 25d by interposing a spacer (not shown) having a predetermined thickness between the portion 25a and the winding plate 20 and inserting them.

Cutting portions 15 and 26 formed on the cutting edge plate 10 and the take-up plate 20 reduce the load of the two plates 10 and 20 so that the upper and lower engagement positions of the two plates can be aligned, Hole.

The lawn mower applying the cutting apparatus 2 according to the present invention as described above can be applied to the pulled grass or the wire 30 that has been cut first by the wire 30 and secondarily by the wire 30, Since the rough cut grass and shrubs that are not cut well are cut, it is possible to effectively perform the mowing operation, using only one grass mowing machine for various mowing work areas having various different characteristics.

1: cutting blade 2 according to the present invention: cutting device according to the present invention
3: lawn mower 4: rotary shaft
10: Cutting blade 11:
12: blade part 12a: root part
12b: Peak portion 12c: Vertical portion
12d: curved blade portion 12e: tooth
13, 22: ridge 14: button hole
15, 26: Cutting section 20: Winding plate
21: shaft hole 23:
24: wire loop 25: partition plate
25a: Fixing portion 25b:
25c: push button 25d: wire seat
30: wire 31: end of wire

Claims (5)

A shaft hole 11 into which the rotation shaft 4 of the lawn mower 3 is inserted is formed at the center and a blade 12 of the same shape having the same central angle? And a cutting blade (10) on which a dog is formed;
Each of the blade portions 12 has a root portion 12a having a shortest radius R1 and a peak portion 12b having a longest radius R2 on the side of the other blade portion 12b adjacent to the peaks 12b A curved blade portion 12d gradually increasing in radius from the root portion 12a to the peak portion 12b and gradually increasing in radius from the root portion 12a to the root portion 12a, And a plurality of teeth (12e) formed along the curved blade portion (12d). A shaft hole 11 into which the rotation shaft 4 of the lawn mower 3 is inserted is formed at the center and a blade 12 of the same shape having the same central angle? Each of the blade portions 12 has a root portion 12a having a shortest radius R1 on one side and a root portion 12b having a longest radius R2 on the other side, A vertical portion 12c connected to the root portion 12a of another adjacent blade portion 12 in the peak portion 12b and a vertical portion 12c extending from the root portion 12a to the peak portion 12b A cutting blade (1) comprising a curved blade portion (12d) whose radius gradually increases and a plurality of teeth (12e) formed along the curved blade portion (12d);
A shaft hole 21 formed at a center position corresponding to the shaft hole 11 of the cutting blade 10 and into which the rotary shaft 4 of the lawn mower 3 is inserted, A winding plate (20) including a reel part (23) which is in contact with the protruding parts (13, 22) so as to be in contact with each other and in a space between the cutting blade (10) And
A wire 30 wound around the reel 23 many times so that both ends 31 are pulled out to the outside;
And a cutting device for cutting the lawn mower. 3. The method of claim 2,
And a wire loop (24) formed by cutting a point around the outer periphery of the winding plate (20). The wire (30) is hooked to the wire loop (24) Is wound around the reel unit (23) and mounted on the reel unit (23). The method according to claim 2 or 3,
Further comprising a partition plate (25) having two, four or six resiliency provided at predetermined intervals along the outer circumference of the winding plate (20) on a surface facing the cutting blade (10);
Each of the partition plates 25 has a fixing portion 25a fixed to the winding plate 20 and a fixing portion 25a extending from the fixing portion 25a and crossing the reed portion 23 obliquely across the cutting blade 10, , And a push button (25c) formed in the partition (25b) of the portion elastically contacting the cutting blade (10);
The cutting blade 10 at a position corresponding to the push button 25c is provided with a button hole 14 capable of pressing the push button 25c on the opposite side of the take- And a cutting device for a mower. The method according to claim 2 or 3,
Further comprising a partition plate (25) having two, four or six resiliency provided at predetermined intervals along the outer circumference of the winding plate (20) on a surface facing the cutting blade (10);
Each of the partition plates 25 has a fixing portion 25a fixed to the winding plate 20 and a fixing portion 25a extending from the fixing portion 25a and crossing the reed portion 23 obliquely across the cutting blade 10, (25b) adjacent to the fixing portion (25a) so as to form a space in which the wire (30) is inserted with a sufficient distance between the partition (25b) And a wire seating portion (25d) formed in the wire-cutter.

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