JP2012228240A - Bush cutter - Google Patents
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- JP2012228240A JP2012228240A JP2011222137A JP2011222137A JP2012228240A JP 2012228240 A JP2012228240 A JP 2012228240A JP 2011222137 A JP2011222137 A JP 2011222137A JP 2011222137 A JP2011222137 A JP 2011222137A JP 2012228240 A JP2012228240 A JP 2012228240A
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Abstract
Description
本発明は、刈払機で刈り取った草や蔓などが刈払機の回転部に巻き付くことを防止した刈払機の技術分野に属するものである。 The present invention belongs to the technical field of a brush cutter that prevents grass, vines, and the like cut by the brush cutter from being wound around a rotating portion of the brush cutter.
この種刈払機は、刈払機の先端に位置して刈り刃の駆動軸を内装する本体部ケ−シングの外周部に、刈り取った刈り草や蔓等が巻き付き易いという問題があり、このため刈刃の回転を円滑にするために巻き付き防止することが提唱されている。 This seed brush cutter has a problem that the cut grass and vines are easily wound around the outer periphery of the main body casing, which is located at the tip of the brush cutter and houses the drive shaft of the cutting blade. It has been proposed to prevent wrapping in order to smooth the rotation of the blade.
巻き付きの防止例として、刈刃の上面に積み重なる刃板と、その刃板の周縁部から回転対称となる配列分布状態として上向きに曲げ起こされた複数の羽根片を設けた構造もみられる。（例えば、特許文献１参照）
また、回転軸の周りに草の巻き付けを防止するために回転可動刃の基部に巻き込み防止リングを設けた構造も見られる。（例えば、特許文献２参照）
As an example of preventing winding, there is a structure in which a blade plate stacked on the upper surface of a cutting blade and a plurality of blade pieces bent upward as an array distribution state that is rotationally symmetric from the peripheral portion of the blade plate are also seen. (For example, see Patent Document 1)
There is also a structure in which an anti-roll ring is provided at the base of the rotary movable blade in order to prevent grass from being wound around the rotary shaft. (For example, see Patent Document 2)
青々と繁茂した草を刈払機が許容する刈り取り容量以上に刈り取った時に、刈払機の柄と刈り刃との間に形成される刈り取り空間に１度に刈り草が入ることがあり、そのために大量の刈り草の持ち回りに伴う抵抗が大となり刈刃の回転が停止することがある。刈払機の使用に不慣れな経験未熟な作業者の時に多く見られるが、作業者は慌てて困窮する場面も見られる。 When lush grass grows beyond the cutting capacity allowed by the brush cutter, the grass may enter the cutting space formed between the handle of the brush cutter and the cutting blade at one time. There is a case that the resistance of the cutting grass is increased and the rotation of the cutting blade is stopped. This is often seen in the case of unexperienced workers who are unfamiliar with the use of brush cutters, but there are also situations where workers are in a hurry.
上記の様な従来の刈払機で雑草の刈り払いを行う場合、刈り取った草につる草等が混じっていると、つる草が刈り刃と本体部ケ−シング廻りに巻き付き、その巻き付き抵抗によって刈払機の刈り刃の回転が停止してしまうことがある。この様に刈り刃の回転が停止した場合は、刈り刃および本体部ケ−シング廻りに巻き付いた草を手で取り除くことになるが、巻き付いた草等を取り除くと抵抗が小さくなり、刈り刃が回転を再開した時に、気をつけていないと作業者が手などを負傷することもあり、巻き付いた草の排除には注意が必要であった。 When weeding the weeds with the conventional brush cutter as described above, if vines are mixed with the cut grass, the vines are wound around the cutting blade and the casing of the main unit, and the resistance is reduced by the winding resistance. The cutter blade rotation may stop. If the cutting blade stops rotating in this way, the grass wrapped around the cutting blade and the main unit casing will be removed by hand, but removing the wrapped grass will reduce the resistance, and the cutting blade will When the rotation was resumed, the workers could be injured if they were not careful, so it was necessary to be careful when removing the wrapped grass.
刈払機で草を刈り取する時、草の長さは短い、長い、茎桿の大小、柔らかい、堅い草等様々な条件の草がある。刈り取りに条件の良いのは、比較的短く、桿のしっかりした立ち姿勢の草は、刈刃の回転力だけで刈り取った切断草を刈刃の回転方向前方の回転半径の外側（刈刃が反時計回りに回転するときは刈刃の右側位置）に放出し排出することが出来る。
連続的な刈り取り作業をするためには、刈り取った切断草を刈刃の回転半径の外側に放出し排出しなければ、刈刃での連続的な刈り取りは不可能となる。
上記に説明したように、刈り刃と本体部ケ−シング廻りに刈草が巻き付きその抵抗によって刈払機の刈り刃の回転が停止してしまうことがある。刈草の条件が多少悪くなってもこの様な状態が起きるのを防ぐ必要がある、特に長い草を刈り取りする時に巻き付き現象が発生し易いが、この巻き付き現象は刈り取った瞬間の刈草の放出力の不足から起こることが主原因であり、この主原因を如何に解決して刈り取った瞬間の刈草の放出力を上げるかが課題である。
When mowing the grass with a brush cutter, there are various lengths of grass such as short, long, large and small stems, soft and hard grass. The grass that is relatively short and has a strong heel stand is good for mowing. The cutting grass that is cut only by the rotational force of the cutting blade is applied to the outside of the turning radius in front of the cutting blade rotation direction (the cutting blade is opposite When rotating clockwise, it can be discharged and discharged to the right side of the cutting blade).
In order to perform a continuous mowing operation, continuous mowing with the cutting blade is impossible unless the cut grass that has been cut is discharged to the outside of the rotation radius of the cutting blade and discharged.
As described above, the mowing blade may be wound around the cutting blade and the main body casing, and the rotation of the cutting blade of the brush cutter may stop due to the resistance. It is necessary to prevent such a situation from occurring even if the conditions of the mowing grass are somewhat deteriorated, especially when a long grass is cut, the winding phenomenon is likely to occur. The main cause is a shortage, and how to resolve this main cause and increase the release power of the mowing grass at the moment of harvesting is a problem.
一般的に、刈払機作業は長時間使用されることが多く、例えば特許文献１のように巻き付き防止体を採用したとしても、刈り取り作業の進行につれて巻き付き防止体の排出面の摩耗や変形（凹凸）が出来ることとなり、この摩耗や変形（凹凸）の発生現象が起きると刈り取られた草の放出が悪くなり、その結果巻き付き現象が発生し易くなって連続作業が困難となる傾向が誘因される。このように、刈り取られた草の放出が悪くなると本体部ケ−シング廻りに巻き付きが起こることもある。このような事情から、巻き付き防止体の排出面は摩耗しない材質を備えることも必要であり、茲に本発明が解決しようとする課題がある。 In general, the brush cutter work is often used for a long time. For example, even if a wrapping prevention body is employed as in Patent Document 1, wear and deformation (unevenness) of the discharge surface of the wrapping prevention body as the cutting operation proceeds. When this phenomenon of wear or deformation (unevenness) occurs, the release of the cut grass becomes worse, and as a result, the wrapping phenomenon tends to occur and the tendency for continuous work to become difficult is induced. . As described above, when the release of the cut grass becomes worse, winding around the main body casing may occur. Under such circumstances, the discharge surface of the wrapping prevention body also needs to be provided with a material that does not wear, and there is a problem to be solved by the present invention.
又、刈払機の刈り作業場所は石が多い中でも使用されることが多く、刈り草による巻き付き防止対策が必要であると共に、この巻き付き防止対策を構成するものは構成簡単で軽量なものが望まれ、しかも石等との衝突強度にも耐える対策が必要であり、巻き付き防止対策によって刈払機の刈り刃の回転が常に円滑であれば消費馬力が軽減され、更に効果が倍増される。茲に本発明が解決しようとする課題がある。 In addition, the mowing work place of the brush cutter is often used even when there are many stones, and it is necessary to take measures to prevent wrapping with mowing grass, and what constitutes this wrapping prevention measure is preferably simple and lightweight. Moreover, it is necessary to take measures to withstand the collision strength with stones and the like. If the rotation of the cutting blade of the brush cutter is always smooth due to the anti-winding measures, the horsepower consumption is reduced and the effect is further doubled. There is a problem to be solved by the present invention.
本発明は、前述の課題解決のために、第一に、基端部にエンジンを配設した柄の先端部に本体部ケ−シングを固設し、該本体部ケ−シングに内装された回転軸に刈り刃を受け止め支持して回転する回転受け具と刈り刃を押圧挟持する締め付け具で固定され、回転受け具と締め付け具の間に刈刃が挟み止められている刈払機において、該刈り刃の上面側に位置させて、刈草を刈り刃の回転方向前方側に押し出して刈り刃の刈り取り軌跡外周の外側に排出促進させる排出面を有する巻き付き防止体を配設構成し、該巻き付き防止体を、刈刃と同体で高速回転させて刈払機への刈草の巻付きを防止していることを特徴とする刈払機にしたものである。 In order to solve the above-mentioned problems, the present invention first has a main body casing fixed to a distal end portion of a handle having an engine disposed at a base end portion, and is internally mounted in the main body casing. In a brush cutter, a rotary receiver that receives and supports a cutting blade on a rotary shaft and is fixed by a rotating tool that is rotated and a clamping tool that presses and holds the cutting blade, and the cutting blade is clamped between the rotating receiver and the clamping tool. Positioned on the upper surface side of the cutting blade, an anti-winding body having a discharge surface that pushes the mowing grass forward in the rotational direction of the cutting blade and promotes the discharge to the outside of the cutting locus of the cutting blade is arranged and configured to prevent the winding The brush cutter is characterized in that the body is rotated at the same speed as the cutting blade to prevent the grass from being wound around the brush cutter.
第二に、基端部にエンジンを配設した柄の先端部に本体部ケ−シングを固設し、該本体部ケ−シングに内装された回転軸に刈り刃を受け止め支持して回転する回転受け具と刈り刃を押圧挟持する締め付け具で固定され、回転受け具と締め付け具の間に刈刃が挟み止められている刈払機において、該回転受け具と刈り刃の間に位置させて、刈草を刈り刃の回転方向前方側に押し出して刈り刃の刈り取り軌跡外周の外側に排出促進させる排出面を有する巻き付き防止体が挟み止め構成され、該巻き付き防止体を、刈刃と同軸で高速回転させて刈払機への刈草の巻付きを防止していることを特徴とする刈払機にしたものである。 Second, the main body casing is fixed to the distal end of the handle with the engine disposed at the base end, and the cutting shaft is received and supported by the rotating shaft built in the main body casing for rotation. In a brush cutter that is fixed with a clamping tool that presses and clamps the rotary receiver and the cutting blade, and the cutting blade is clamped between the rotary receiver and the clamping tool, it is positioned between the rotary receiver and the cutting blade. An anti-winding body having a discharge surface that pushes the cut grass forward in the rotation direction of the cutting blade and promotes discharge to the outside of the cutting locus of the cutting blade is clamped, and the anti-winding body is coaxial with the cutting blade at high speed. The brush cutter is characterized in that it prevents the mowing of the grass from being wound around the brush cutter.
第三に、巻き付き防止体は、平面視で円盤部より外方に放射方向に突出する羽根状の排出羽根体を設け、該排出羽根体の排出面の角度を回転方向の後方にやや後退させる後退角を有する形態にして、排出面の厚さは８〜１５ｍｍに構成する共に、刈刃先端の刈り取り軌跡円周とほぼ同外径の排出軌跡を有するようにして円盤部に等間隔に設けられる排出面は４個で構成されることを特徴とする刈払機にしたものである。 Thirdly, the wrapping prevention body is provided with a blade-like discharge blade body that protrudes radially outward from the disk portion in plan view, and the angle of the discharge surface of the discharge blade body is slightly retracted backward in the rotation direction. The discharge surface is configured to have a receding angle, the thickness of the discharge surface is set to 8 to 15 mm, and the discharge portion has a discharge locus having the same outer diameter as the cutting locus circumference of the cutting blade tip, and is provided at equal intervals in the disk portion. The discharge surface to be formed is a brush cutter characterized by comprising four pieces.
第四に、巻き付き防止体の排出面は、排出羽根体の外周側と回転方向前進側を覆う形態で装着されて排出羽根体を保護する耐摩耗性部材からなる排出補強体の回転方向前面に形成され、排出補強体は排出羽根体に一体固定されることを特徴とする刈払機にしたものである。 Fourthly, the discharge surface of the wrapping prevention body is attached to the front surface in the rotational direction of the discharge reinforcing body that is mounted in a form that covers the outer peripheral side of the discharge blade body and the forward side in the rotational direction to protect the discharge blade body. The discharge reinforcement body is formed into a brush cutter characterized by being integrally fixed to the discharge blade body.
第五に、巻き付き防止体は、平面視で円盤部より外方に放射方向に突出する羽根状の排出羽根体を設け、該排出羽根体の排出面の角度を回転方向の後方にやや後退させる後退角を有する形態にして、排出面の厚さは８〜１５ｍｍに構成する共に、刈刃先端の刈り取り軌跡円周より５〜２０ｍｍ同外径より小さめにし、円盤部外周から排出面に至る排出誘導面を有するようにして円盤部に等間隔に設けられる排出面は４個で構成され、排出羽根体に孔をそれぞれに設け、刈り刃と巻き付き防止体をボルトとナットで締め付けられることを特徴としたものである。 Fifth, the wrapping prevention body is provided with a vane-shaped discharge blade body that protrudes radially outward from the disk portion in plan view, and the angle of the discharge surface of the discharge blade body slightly moves backward in the rotational direction. The discharge surface is configured to have a receding angle of 8 to 15 mm, the diameter of the cutting blade is 5 to 20 mm smaller than the cutting locus circumference, and the discharge from the outer periphery of the disk portion to the discharge surface is performed. There are four discharge surfaces provided at equal intervals in the disk portion so as to have a guide surface, holes are provided in the discharge blade body, and the cutting blade and the wrapping prevention body can be tightened with bolts and nuts. It is what.
第六に、巻き付き防止体は、平面視で円盤部より外方に放射方向に突出する羽根状の排出羽根体を設け、該排出羽根体の排出面の角度を回転方向の後方にやや後退させる後退角を有する形態にして、排出面の厚さは８〜１５ｍｍに構成する共に、刈刃先端の刈り取り軌跡円周より５〜２０ｍｍ同外径より小さめにし、円盤部外周から排出面に至る排出誘導面を有するようにして円盤部に等間隔に設けられる排出面は４個で構成され、それぞれの排出羽根体の裏側に取付板を溶接し、排出羽根体と取付板で刈り刃を挟む構造にしたことを特徴とする。 Sixth, the wrapping prevention body is provided with a vane-shaped discharge blade body projecting radially outward from the disk portion in plan view, and the angle of the discharge surface of the discharge blade body is slightly moved backward in the rotational direction. The discharge surface is configured to have a receding angle of 8 to 15 mm, the diameter of the cutting blade is 5 to 20 mm smaller than the cutting locus circumference, and the discharge from the outer periphery of the disk portion to the discharge surface is performed. There are 4 discharge surfaces provided at equal intervals in the disk part so as to have a guide surface, and a mounting plate is welded to the back side of each discharge blade body, and a cutting blade is sandwiched between the discharge blade body and the mounting plate It is characterized by that.
第七に、巻き付き防止体は、平面視で円盤部より外方に放射方向に突出する羽根状の排出羽根体を設け、該排出羽根体の排出面の角度を回転方向の後方にやや後退させる後退角を有する形態にして、排出面の厚さは８〜１５ｍｍに構成する共に、刈刃先端の刈り取り軌跡円周より５〜２０ｍｍ同外径より小さめにし、円盤部外周から排出面に至る排出誘導面を有するようにして円盤部に等間隔に設けられる排出面は４個で構成され、巻き付き防止体と刈り刃が一体成形で構成されることを特徴とする。 Seventh, the wrapping prevention body is provided with a vane-shaped discharge blade body projecting radially outward from the disk portion in plan view, and the angle of the discharge surface of the discharge blade body is slightly retracted backward in the rotational direction. The discharge surface is configured to have a receding angle of 8 to 15 mm, the diameter of the cutting blade is 5 to 20 mm smaller than the cutting locus circumference, and the discharge from the outer periphery of the disk portion to the discharge surface is performed. There are four discharge surfaces provided at equal intervals in the disk portion so as to have a guide surface, and the wrapping prevention body and the cutting blade are formed by integral molding.
第八に、巻き付き防止体は、平面視で円盤部より外方に放射方向に突出する羽根状の排出羽根体を設け、該排出羽根体の排出面の角度を回転方向の後方にやや後退させる後退角を有する形態にして、排出面の厚さは８〜１５ｍｍに構成する共に、刈刃先端の刈り取り軌跡円周より５〜２０ｍｍ同外径より小さめにし、円盤部外周から排出面に至る排出誘導面を有するようにして円盤部に等間隔に設けられる排出面は４個で構成され、且つ、巻き付き防止体と刈り刃は別体で構成され、巻き付き防止体の中央部下面は巻き付き防止体の外周下端より２〜５ｍｍ浅く構成され、刈り刃と巻き付き防止体をナットで締め付けた時、押圧部があるので刈り刃が反る程度に締め付けられる、巻き付き防止体の外周下端と刈り刃の接点には隙間が生じないように構成されることを特徴とする。 Eighth, the wrapping prevention body is provided with a vane-shaped discharge blade body projecting radially outward from the disk portion in plan view, and the angle of the discharge surface of the discharge blade body is slightly retracted backward in the rotation direction. The discharge surface is configured to have a receding angle of 8 to 15 mm, the diameter of the cutting blade is 5 to 20 mm smaller than the cutting locus circumference, and the discharge from the outer periphery of the disk portion to the discharge surface is performed. The discharge surface provided at equal intervals in the disk portion so as to have a guide surface is composed of four pieces, and the anti-winding body and the cutting blade are formed separately, and the lower surface of the central portion of the anti-winding body is the anti-winding body. The contact between the lower end of the anti-winding body and the cutting blade is configured to be 2-5 mm shallower than the lower end of the outer periphery, and when the cutting blade and the anti-winding body are tightened with a nut, there is a pressing part so that the cutting blade is warped. No gaps Characterized in that it is configured urchin.
刈り刃と本体部ケ−シング廻りに草の巻き付きが発生すれば、エンジンが作動していてもトルクリミッターの作用で刈り刃の回転が停止する、巻き付きを取る作業が発生、その結果取り除きの為の手間が掛かり刈り取り作業の能率が損なわれることになる。刈払機の巻き付きを取ったりする作業が不要となれば作業効率が向上することとなり、作業者の負担も少なくなる。本体部ケ−シング部への巻き付き防止対策は刈り取られた草が刈刃の回転半径の外側に刈り取り瞬時に放出し排出されることである。 If grass wraps around the cutting blade and the casing of the main unit, even if the engine is operating, the torque limiter acts to stop the cutting blade from rotating. Therefore, the efficiency of the mowing work is impaired. If the work of winding the brush cutter becomes unnecessary, the work efficiency is improved and the burden on the operator is reduced. A countermeasure for preventing the main body casing from being wound is that the cut grass is immediately cut out and discharged outside the rotation radius of the cutting blade.
上記に説明した本発明の課題を解決するための手段による、巻き付き防止体の働きで本体部ケ−シング部に草の巻き付きがなくなる、刈払機の刈り刃の回転を停止したり、刈り草の巻き付きを解消するために、巻き付いた刈草を取ったりすることが不要となり、作業者の負担軽減と刈り取り作業効率が向上する。
巻き付いた草を手で取り除く時、巻き付きが多い時には、刈払機の柄に装着されている肩掛け用の携帯用バンドを取り外してから回転刃の所に行って取り除く必要がある。取り除きの時間も、更に取り除き作業は非常に煩わしく、その上に草刈り時期は夏の炎天下での作業、取り除きは想像以上に苦痛である。この作業がなくなることの実用的効果は非常に大きい。
従来機では刈り取り条件の悪い時には度々本体部ケ−シング部に草の巻き付きが発生し、危険な思いをし、取り除きの為に煩わしい作業をしていたが、このことがなくなることで非常に喜ばれる。
By means of the means for solving the problems of the present invention described above, the winding prevention body prevents the winding of the grass in the main body casing, the rotation of the cutting blade of the brush cutter is stopped, or the cutting grass In order to eliminate the winding, it is not necessary to remove the wound grass, which reduces the burden on the operator and improves the cutting efficiency.
When removing the wrapped grass by hand, when there are many windings, it is necessary to remove the portable shoulder band attached to the handle of the brush cutter and then go to the rotary blade and remove it. In addition, the removal work is very troublesome, and the mowing time is the work under the hot summer heat, and the removal is more painful than expected. The practical effect of eliminating this work is very great.
In conventional machines, grass winding often occurred in the main body casing when the cutting conditions were bad, and it was dangerous and troublesome work to remove it. It is.
また、本体部ケ−シング廻りに刈払機作業で巻き付きのない構造は、刈り取られた草が刈刃の回転半径の外に刈り取り瞬時に放出し排出されることが基本であり、その解決手段は巻き付き防止体を設けることで排出力がアップする。巻き付き防止体は刈刃と同軸で高速回転させ、巻き付き防止体の構造は排出羽根体の外周側と回転方向前進側を覆う形態で装着される排出補強体を設け、排出補強体に排出面を設ける。排出面の角度をやや後退角に構成し、更に刈刃とほぼ同外径で厚さは８〜１５ｍｍ程度、排出面は４個で構成される。
刈払機作業は長時間使用され、稲作における畦草刈りは草の生長が早いので年間同じ所を６回も刈り取りをすることになる。草の根本は非常に堅く、巻き付き防止体には、耐摩耗性が必要で巻き付き防止体の先端部に設けられる排出羽根体は樹脂に耐摩耗性に強い金属素材Ｓ４５Ｃを一体的に樹脂成形されて特殊な構造で形成される。
In addition, the structure that does not wind around the main body casing by the brush cutter work is basically that the cut grass is cut out immediately outside the rotation radius of the cutting blade and discharged and discharged. Discharging power is improved by providing a wrapping prevention body. The anti-winding body is rotated at high speed on the same axis as the cutting blade, and the structure of the anti-winding body is provided with a discharge reinforcing body that is mounted so as to cover the outer peripheral side of the discharge blade body and the forward side in the rotational direction, and the discharge reinforcing body has a discharge surface. Provide. The angle of the discharge surface is configured to be a slight receding angle, and the outer diameter is substantially the same as that of the cutting blade, the thickness is about 8 to 15 mm, and the number of discharge surfaces is four.
The brush cutter work is used for a long time, and the grass cutting in rice cultivation grows fast, so the same place is cut 6 times a year. The root of the grass is very hard, and the anti-winding body requires wear resistance, and the discharge vane body provided at the tip of the anti-winding body is integrally molded with a metal material S45C, which is highly resistant to wear. It is formed with a special structure.
巻き付き防止体の作用原理は刈り取られた草が刈り刃の回転半径の外に刈り取り瞬時に放出し排出される、即ち刈り刃の上に切断草がない、だから大幅な放出力アップが出来る。
この働きで刈り取り作業中にエンジンの回転ダウンが半減、更に青々と繁茂した草を刈払機の能力以上に刈り取った時、刈り取り空間に１度に刈り草が入りこみ、抵抗が大となり刈刃の回転が低下することがある、その様な状態でも巻き付き防止体の働きで巻き付きもなく、巻き付かないから抵抗もなく、エンジンの回転ダウンも非常に少なく能率もダウンしない。
The principle of action of the anti-winding body is that the cut grass is cut out and discharged instantly outside the cutting radius of the cutting blade, that is, there is no cut grass on the cutting blade, so the output can be greatly increased.
This cuts the engine speed down by half during the mowing operation, and when mowing the lush grass over the capacity of the brush cutter, the mowing grass enters the mowing space at a time, increasing resistance and rotating the cutting blade. Even in such a state, there is no winding due to the action of the anti-winding body, no resistance because it does not wind, the engine rotation is very low and the efficiency is not reduced.
刈払機の作業は長時間使用される、畦草刈りは草の生長が早いので稲作には年間同じ所を６回も刈り取りをする、草の根本は非常に堅く、耐摩耗性が必要で巻き付き防止体の先端部は特殊な構造で形成され、刈払機の寿命一杯耐久出来る部品にして交換なし構造にしたので、作業者も安心出来る。 The work of the brush cutter is used for a long time, and the grass growing is fast because the grass grows fast, so the same place is harvested 6 times a year for the rice cultivation, the root of the grass is very hard, wear resistance is necessary and it is an anti-rolling body The tip of the is formed with a special structure, and it is a part that can be used for the full life of the brush cutter.
草刈りは長時間作業で刈り払い機が重いと疲労が多い、巻き付き防止体２Ｂ、２Ｃ型は薄い鉄板製で軽く、更に刈り刃の半径より８〜１５ｍｍ小さい、刈り取り田面は石が多い、半径が小さいと石に当たる確立が少ないことがテストの結果判明した。
巻き付き防止体２Ｂ、２Ｃ型の円盤部は刈り刃から見て凸状で形成しているために、円盤部にゴミが溜まらない。
Mowing is a long work, and the mower is heavy and the fatigue is heavy. The anti-winding bodies 2B and 2C are lightly made of thin iron plates, and are 8 to 15 mm smaller than the cutting blade radius. As a result of the test, it was found that there was less chance of hitting the stone if it was small.
Since the wrapping preventing bodies 2B and 2C type disk portions are formed in a convex shape when viewed from the cutting blade, no dust accumulates on the disk portion.
図２１の構造では巻き付き防止体と刈り刃が１体成形で構成されるので、より１層軽くなる為に、作業者の疲労が少なくなり、巻き付き防止体と刈り刃が１体であり取り付けも容易、更に別体構造よりコストも安価になる。 In the structure of FIG. 21, the wrapping prevention body and the cutting blade are formed by a single body, so that one layer is lighter, so that the operator's fatigue is reduced, the wrapping prevention body and the cutting blade are one body, and the attachment is also easy. Easier and less expensive than separate structures.
図２３，２４，２５の構造で巻き付き防止体と刈り刃は別体で、巻き付き防止体はステンレス製で耐久性に優れ、刈り刃は刈り取り時に草と泥、石等を同時に刈り取るので耐久性が短い、部品交換は巻き付き防止体は３倍位耐久性があるので経済的である。
巻き付き防止体の構造で中央部は刈り刃上面より２〜５ｍｍ浅く構成され、刈り刃と巻き付き防止体をナットで締め付けた時、刈り刃が反る程度に締め付けられる、巻き付き防止体と刈り刃の接点は強力な力で締め付けられるので、隙間はない、円盤部外周と刈り刃との間に草等の巻き込みがなくなり、消費馬力の軽減化が図られる。
23, 24, and 25, the anti-winding body and the cutting blade are separate, and the anti-winding body is made of stainless steel and has excellent durability, and the cutting blade cuts grass, mud, stones, etc. at the same time when mowing, so it is durable. Short replacement of parts is economical because the wrapping prevention body is about three times more durable.
The structure of the anti-winding body has a central part that is 2 to 5 mm shallower than the upper surface of the cutting blade. When the cutting blade and the anti-winding body are tightened with a nut, the cutting blade can be tightened to the extent that the cutting blade warps. Since the contact is tightened with a strong force, there is no gap, grass or the like is not caught between the outer periphery of the disk portion and the cutting blade, and the power consumption is reduced.
以下、実施形態に関する図面に基づいて本発明を詳細に説明する。
図１〜図１０に本発明の第一実施形態を示す。説明する図１は、基端部にエンジン１２を取り付けた刈り払い機１１の主棹から構成される柄４の先端に設けられている回転型の十字羽根型の刈り刃であり、該刈り刃１は、柄４の先端部に本体部ケ−シング３を固設し、該本体部ケ−シング３に内装された回転軸５の動力を受けて回転する。刈り刃１への動力の伝達は、エンジン１２からトルクリミッター（図示せず）を介して伝導軸２０に伝達され、伝導軸２０先端のベベルギヤ−Ａ２１と回転軸５の上端に設けたベベルギヤ−Ａ２２が噛み合いし、回転軸５を駆動する。
Hereinafter, the present invention will be described in detail based on the drawings relating to the embodiment.
1 to 10 show a first embodiment of the present invention. FIG. 1 to be described is a rotary cruciform blade cutting blade provided at the tip of a handle 4 composed of a main shaft of a brush cutter 11 having an engine 12 attached to a base end portion. 1, a main body case 3 is fixed to the distal end portion of the handle 4, and rotates by receiving the power of a rotating shaft 5 housed in the main body case 3. Transmission of power to the cutting blade 1 is transmitted from the engine 12 to the transmission shaft 20 via a torque limiter (not shown), and a bevel gear A21 at the tip of the transmission shaft 20 and a bevel gear A22 provided at the upper end of the rotary shaft 5. Mesh with each other to drive the rotary shaft 5.
そして、回転軸５にスプライン２３で結合して刈り刃１を受け止め支持して回転する回転受け具６の軸首部２４に、刈り刃１の孔部を嵌装してナット１９の締め付け力で回転受け具６側に押圧して挟持する円盤状の締め付け具７で固定されている。このように、回転受け具６と締め付け具７との間に刈刃１が挟み止められている形態を前提に構成した刈払機において、本発明は、前記回転受け具６と刈り刃１の間に位置させて、切断した刈草１４を刈り刃１の回転方向前方側に押し出して刈り刃１の刈り取り軌跡外周の外側に排出促進させる排出面１０Ａを有する巻き付き防止体２Ａが回転受け具６の軸首部２４に嵌装されて挟み止め構成され、該巻き付き防止体２Ａを、刈刃１と同軸で一体的に高速回転させて刈払機への刈草の巻付きを防止している。 Then, the hole of the cutting blade 1 is fitted to the shaft neck portion 24 of the rotating receiving tool 6 which is coupled to the rotating shaft 5 by the spline 23 and receives and supports the cutting blade 1 to rotate, and is rotated by the tightening force of the nut 19. It is fixed by a disk-shaped fastening tool 7 that is pressed and clamped to the receiving tool 6 side. Thus, in the brush cutter configured on the premise that the cutting blade 1 is clamped between the rotary receiver 6 and the fastening tool 7, the present invention provides a configuration between the rotary receiver 6 and the cutting blade 1. The anti-winding body 2A having the discharge surface 10A that pushes the cut grass 14 forward in the rotational direction of the cutting blade 1 and promotes discharge to the outside of the cutting locus outer periphery of the cutting blade 1 is positioned on the shaft of the rotary support 6 The wrapping prevention body 2A is coaxially rotated with the cutting blade 1 and integrally rotated at a high speed to prevent the chopped grass from being wound around the brush cutter.
図２は本発明の要部を示す平面図である、刈刃１が十字羽根型の４枚刃の場合は巻き付き防止体２Ａと刈刃１との関係位置は図２の様に巻き付き防止体２Ａの十字羽根の中間に刈刃１が固定される。刈刃１が４枚刃の場合は巻き付き防止体２Ａも十字羽根型に構成して図２、図５に示される様にピン状の位置ガイド２５を設ける、刈刃１には位置ガイド孔２６を設けて、位置ガイド２５を位置ガイド孔２６に合わせて固定する。
刈刃１が丸鋸刃構造の場合には、巻き付き防止体の位置固定は特定しない。
FIG. 2 is a plan view showing the main part of the present invention. When the cutting blade 1 is a four-blade blade, the relative position between the winding preventing body 2A and the cutting blade 1 is as shown in FIG. The cutting blade 1 is fixed in the middle of the 2A cross blade. When the cutting blade 1 has four blades, the anti-winding body 2A is also configured in a cross-blade shape and is provided with a pin-shaped position guide 25 as shown in FIGS. 2 and 5. The cutting blade 1 has a position guide hole 26. And the position guide 25 is fixed in accordance with the position guide hole 26.
When the cutting blade 1 has a circular saw blade structure, the fixing of the position of the anti-winding body is not specified.
巻き付き防止体２Ａは、刈刃１と回転軸５で同軸高速回転をさせる、通常の刈り取り作業ではエンジン１２の回転数は５０００ｒｐｍ以上で作業をする、理由は高速回転にしたほうが刈り取り時に負荷馬力が低いからである。
巻き付き防止体２Ａは、平面視で円盤部８Ａより外方に放射方向に突出する羽根状の排出羽根体９Ａを設け、該排出羽根体９Ａの排出面１０Ａの角度を回転方向の後方にやや後退させる約８度位の後退角αを有する形態にして、排出面１０Ａの厚さｔは８〜１５ｍｍに構成する共に、刈刃１先端の刈り取り軌跡円周とほぼ同外径の排出軌跡を有するようにして円盤部８より外方に十字形に突出して等間隔に設けられる排出面は４個で構成される。
The anti-winding body 2A rotates at a high speed coaxially between the cutting blade 1 and the rotary shaft 5. In a normal mowing operation, the engine 12 operates at a rotational speed of 5000 rpm or more. Because it is low.
The winding preventing body 2A is provided with a blade-like discharge blade body 9A that protrudes radially outward from the disk portion 8A in a plan view, and the angle of the discharge surface 10A of the discharge blade body 9A is slightly retracted backward in the rotational direction. The discharge surface 10A has a thickness t of 8 to 15 mm, and has a discharge trajectory having substantially the same outer diameter as the cutting trajectory circumference of the cutting blade 1 tip. In this way, there are four discharge surfaces that protrude in a cross shape outward from the disk portion 8 and are provided at equal intervals.
排出面１０Ａの厚さｔは８〜１５ｍｍに構成するもので、実験例では厚さ９ｍｍで確認した。厚さを９ｍｍにする根拠は刈刃１で切断された切断草１４は、切断瞬時に排出しないと刈り取りが継続出来ないものであり、厚さが９ｍｍ以上になると瞬時に排出される。この寸法は実験により出た寸法である。
排出面１０Ａは４個で構成される、排出面１０Ａが４個で構成されるのは、刈刃１で刈り取られた切断草１４の切断瞬時量の適切量があることが判明、適切量は実験の結果で４枚が最適であった。
厚さが９ｍｍ以上になると瞬時に排出されるもので、８ｍｍ以下では厚さが薄いと排出力が弱くなり、刈り取り瞬時量を排出することが出来ないことが実験の結果判明し、９ｍｍ基準で許容を見て最低８ｍｍ位とした。又１５ｍｍ以上になると抵抗が大きくなりすぎて排出効果が低下するものであり、８〜１５ｍｍ程度が最適である。
The discharge surface 10A has a thickness t of 8 to 15 mm. In the experimental example, the thickness t was confirmed to be 9 mm. The basis for making the thickness 9 mm is that the cut grass 14 cut by the cutting blade 1 cannot be cut unless it is immediately discharged, and is immediately discharged when the thickness is 9 mm or more. This dimension is a dimension obtained by experiment.
The discharge surface 10A is composed of four pieces. The four discharge surfaces 10A are composed of four pieces. It is found that there is an appropriate amount of the instantaneous cutting amount of the cut grass 14 cut by the cutting blade 1, and the appropriate amount is As a result of the experiment, 4 sheets were optimum.
When the thickness exceeds 9 mm, it is discharged instantly. When the thickness is less than 8 mm, the discharging force becomes weak, and the experimental results show that the instantaneous amount of cutting cannot be discharged. In view of the tolerance, the minimum value is about 8 mm. On the other hand, when the thickness is 15 mm or more, the resistance becomes too large and the discharge effect is lowered.
巻き付き防止体２Ａの排出面１０Ａは、排出羽根体９Ａの外周側と回転方向前進側を覆う形態で装着されて排出羽根体９Ａを保護する耐摩耗性部材からなる排出補強体１０の回転方向前面に形成され、排出補強体１０は排出羽根体９Ａに一体成形される。そして、排出補強体１０は先部抜け止め突起１０Ｂと基部抜け止め突起１０Ｃを持ち、排出体補強体１０は耐摩耗性部材である金属素材Ｓ４５Ｃの鍛造品で成形、先部抜け止め突起１０Ｂと基部抜け止め突起１０Ｃは巻き付き防止体２Ａの素材が樹脂成型であり、樹脂成形時に先部抜け止め突起１０Ｂと基部抜け止め突起１０Ｃを同時に内蔵して成形するので、排出体補強体１０の結合力は強く脱落する恐れがない。 The discharge surface 10A of the wrapping prevention body 2A is mounted in a form that covers the outer peripheral side of the discharge blade body 9A and the forward side in the rotation direction, and the front surface in the rotation direction of the discharge reinforcement body 10 made of a wear-resistant member that protects the discharge blade body 9A. The discharge reinforcing body 10 is integrally formed with the discharge blade body 9A. The discharge reinforcing body 10 has a front retaining protrusion 10B and a base retaining protrusion 10C, and the discharged body reinforcing body 10 is formed of a forged product of a metal material S45C, which is a wear resistant member, and the front retaining protrusion 10B. The base detachment protrusion 10C is made of resin molding as the material of the wrapping prevention body 2A. Since the front detachment protrusion 10B and the base detachment protrusion 10C are simultaneously incorporated during molding, the binding force of the discharger reinforcement 10 is determined. There is no fear of falling off.
図２１と図２２の構造では巻き付き防止体８Ｄと刈り刃１が１体構造で構成される。すなわち、プレス成形等で平面巴型に成型されている巻き付き防止体８Ｄを、摩擦溶接やスポット溶接などで刈り刃１に１体的に溶着して形成される。 In the structure of FIGS. 21 and 22, the wrapping preventing body 8 </ b> D and the cutting blade 1 are configured as a single body structure. That is, the wrapping preventing body 8D molded into a flat saddle shape by press molding or the like is formed by welding integrally to the cutting blade 1 by friction welding, spot welding or the like.
本発明の刈払機による作業の方法と、刈草の放出作用を具体的に説明する。
刈払機の使用場所は平面、傾斜面、草の長短等様々な条件下で使用される、そこであらゆる条件下でも使用に耐える必要がある、刈払機はとても便利な機械である為に、経験未熟もしくは未経験の人が使用することも多い。経験未熟もしくは未経験者が使用する時に１番困るのが、本体部ケ−シング部３に切断草１４の巻き付きが発生することである。
巻き付きが時々発生するので取り除く必要がある、経験未熟もしくは未経験の人が使用するとその頻度が高くなる、そうなるとエンジンを完全に止めないで取り除こうとする為に怪我をする恐れがあり、巻き付きのない機械が求められる。
The working method by the brush cutter of the present invention and the action of releasing the mowing grass will be specifically described.
The brush cutter is used under various conditions such as plane, inclined surface, grass length, etc., and it is necessary to endure the use under all conditions. The brush cutter is a very convenient machine, so it is inexperienced Or it is often used by inexperienced people. What is most troublesome when used by an inexperienced or inexperienced person is that the cutting grass 14 is wound around the main body casing 3.
Winding sometimes occurs and needs to be removed, if it is used by inexperienced or inexperienced people, the frequency will increase, and if it does so, it may cause injury because it tries to remove the engine without completely stopping it, and the machine without winding Is required.
つる草などが少なく刈り草が短くて直立しているなどの条件の良い時の刈り取りは刈刃１の回転力で切断草１４が放出され巻き付きは殆どない、反面柔らかくて長い草やつる草が多いところなどの条件が悪い場所では巻き付きが発生しやすい。
条件が悪い時は消費馬力が多くなるためにエンジン回転が低下する、そうすると放出力（回転力）が弱くなり切断草１４が刈り刃１と柄４、飛散防止体１８で形成される刈り取り空間１６に溜まり、飛散防止体１８があるので排出されない、その結果本体部ケ−シング部３に巻き付きが発生する。刈刃１の厚さは１．６ｍｍ程度であり放出力が弱い。
草丈が１０ｃｍ以上の場合の刈刃１の切断メカニカルを説明すると、刈刃１は刈り取り時に切断と放出、排出を同時に３つの作用をすることになる、切断瞬時に切断草１４は刈刃１から上の方に浮き離れ運動軌跡をする、切断草１４は下部に切断による未刈草が残っているので下部には運動出来ない、従って上の方に浮き離れ運動軌跡をした切断草１４の放出、排出は次の工程時に刈り取られた切断草１４で排出されることになり、放出力はない、放出力がないので押し出し放出となる。
そのためにエンジン１２の回転が低下すると刈り取り空間１６に溜まりやすくなり、切断草１４の逃げ場がなくなり本体部ケ−シング部３に巻き付きが発生する。巻き付きが起こるので取り除かねばならない。
草丈が１０ｃｍ以下の場合の刈刃１の切断メカニカルを説明すると、切断瞬時に切断草１４は刈刃１から上の方に浮き離れ運動軌跡をする、切断草１４が短いので刈り取り空間１６を占める容積が少ないので、溜まり現象は発生しない、もう１つは草丈が短いのでエンジン１２の回転低下が殆どない、この２つから。草丈が１０ｃｍ以下では刈り取り空間１６に溜まりがなく、巻き付きはない。
Cutting under good conditions such as few vines and short chopped grasses, cutting grass 14 is released by the rotational force of cutting blade 1 and there is almost no wrapping. Winding is likely to occur in places with poor conditions such as many places.
When the conditions are bad, the engine power is reduced due to an increase in the horsepower consumed, so that the output (rotation force) is weakened and the cutting grass 14 is cut by the cutting blade 1, the handle 4, and the cutting space 16 formed by the scattering prevention body 18. Since the anti-scattering body 18 is collected, it is not discharged. As a result, the main body casing 3 is wound. The thickness of the cutting blade 1 is about 1.6 mm, and the discharge power is weak.
Explaining the cutting mechanism of the cutting blade 1 when the plant height is 10 cm or more, the cutting blade 1 has three actions of cutting, releasing, and discharging at the time of cutting, and the cutting grass 14 from the cutting blade 1 at the moment of cutting. The cut grass 14 that floats upward and has a movement trajectory cannot be moved in the lower part because uncut grass remains in the lower part of the cut grass 14, and therefore, the cut grass 14 that floats upward and has a trajectory of movement is released. The discharge is discharged by the cut grass 14 cut in the next process, and there is no discharge, and there is no discharge, so the discharge is pushed out.
For this reason, when the rotation of the engine 12 is reduced, the engine 12 tends to accumulate in the cutting space 16, so that the cut grass 14 does not escape and the main body casing 3 is wound. It must be removed because it will be wrapped.
The cutting mechanism of the cutting blade 1 when the plant height is 10 cm or less will be described. The cutting grass 14 floats upward from the cutting blade 1 at the moment of cutting and has a movement trajectory. Since the cutting grass 14 is short, it occupies the cutting space 16. Since the volume is small, the accumulation phenomenon does not occur. The other is that the plant height is short, so there is almost no decrease in the rotation of the engine 12. When the plant height is 10 cm or less, there is no accumulation in the mowing space 16 and there is no winding.
そこで放出力をＵＰし排出力も上げて巻き付きをなくす、巻き付き防止体２Ａは厚さが９ｍｍに設定、実験の結果巻き付きがなくなった、刈り刃１の厚さが１．６ｍｍの約６倍、放出力即ち排出力のＵＰが出来たので常時放出されるので刈り取り空間１６に溜まりがなく刈り取り量より放出力、排出力が上廻った為に詰まりがない、エンジン低下した時も巻き付きがない、実験の結果この様な論理が証明された。 Therefore, the output is increased and the discharge force is increased so as to eliminate the wrapping. The wrapping prevention body 2A is set to a thickness of 9 mm. As a result of the experiment, there is no wrapping. Since the output, i.e., the discharge power, has been increased, it is always released, so there is no accumulation in the cutting space 16 and the output is higher than the amount of cutting, the output is higher and the clogging is not clogged. As a result, such logic was proved.
図１１〜図１４に本発明第二実施形態の巻き付き防止体を例示して説明する。巻き付き防止体２Ｂは軽量化のためにプレスで絞り成形した薄い鉄板製で、断面形状は図１１に示されるようにカニ甲羅形態の皿殻状に円盤部８Ｂが形成され、十字形の排出羽根体９Ｂは刈り刃上面から凸形状、中央部３３は刈り刃に密着した凹陥没形状、図１３の回転受け具６の軸首部２４へのセットは基本的には第一実施形態の図３と同様であるが、巻き付き防止体２Ｂを上部に刈り刃１を下部に重ねてセットして、締め付け具７とナット１９で締め付ける、セット時に巻き付き防止体２Ｂは薄い鉄板製で軽くセットがやり易い。また、軽いために刈り払い作業も労力軽減して円滑にできる。
排出羽根体９Ｂは円盤部外周３５と排出面１０Ａで形成される円盤部外周から排出面に至る排出誘導面（Ｘ）を有する部分の排出面厚さｔを８〜１５ｍｍで構成されているから、切断草１４の排出が完全に行われる。
上記第二実施形態の巻き付き防止体２Ｂの外周径は、刈刃１先端の刈り取り軌跡円周より５〜２０ｍｍ小さいので、刈り取り地面は石が多いことがあっても巻き付き防止体２Ｂへの石の衝突回数が非常に少ない。
市場販売されている丸鋸刃構造の刈り刃１には重量軽減のために円周部に多数の孔３４が穿けられているものがある。この場合には、巻き付き防止体２Ｂの排出羽根体９Ｂに長孔３０を設け、この長孔３０を刈り刃の孔３４に合わせて、ボルト３１を通して、ボルト３１とナット３２で刈り刃１に巻き付き防止体２Ｂを一体的に先端部締め付けすると排出羽根体９Ｂの強度が強い。
FIGS. 11 to 14 illustrate and explain the wrapping preventing body according to the second embodiment of the present invention. The wrapping prevention body 2B is made of a thin iron plate drawn by a press for weight reduction, and the cross-sectional shape is formed as a crab shell-shaped disk shell as shown in FIG. The body 9B has a convex shape from the upper surface of the cutting blade, the central portion 33 has a concave and recessed shape in close contact with the cutting blade, and the set of the rotary receiver 6 in FIG. 13 to the shaft neck portion 24 is basically the same as that in FIG. Although it is the same, the anti-winding body 2B is set on the upper portion with the cutting blade 1 stacked on the lower side, and tightened with the fastening tool 7 and the nut 19. The anti-winding body 2B is made of a thin iron plate and is easy to set. Moreover, since it is light, the mowing work can be reduced smoothly and smoothly.
The discharge blade body 9B has a discharge surface thickness t of 8 to 15 mm at a portion having a discharge guide surface (X) extending from the disk portion outer periphery to the discharge surface formed by the disk portion outer periphery 35 and the discharge surface 10A. The cut grass 14 is completely discharged.
Since the outer diameter of the anti-winding body 2B of the second embodiment is 5 to 20 mm smaller than the cutting locus circumference of the cutting blade 1 tip, even if the cutting ground has a lot of stones, Very few collisions.
Some cutting blades 1 having a circular saw blade structure on the market have a large number of holes 34 in the circumferential portion for weight reduction. In this case, a long hole 30 is provided in the discharge blade body 9B of the wrapping preventing body 2B, the long hole 30 is aligned with the hole 34 of the cutting blade, passed through the bolt 31, and wound around the cutting blade 1 with the bolt 31 and the nut 32. When the prevention body 2B is integrally tightened at the tip, the strength of the discharge blade body 9B is strong.
図１５〜図１９に本発明第三実施形態の巻き付き防止体を例示して説明する。前記第二実施形態の巻き付き防止体２Ｂに比較して、第三実施形態の巻き付き防止体２Ｃとの相違点は刈り刃が第二実施形態は丸鋸刃構造のものに対して、第三実施形態のものは十字羽根型の４枚刃であるという形態で刈り刃１が違う為に、刈り刃１の固定方法が巻き付き防止体２Ｂではボルト固定、巻き付き防止体２Ｃでは取付板４０で固定する。その他は同一である。
巻き付き防止体２Ｃは軽量化のために薄い鉄板製で、断面形状は図１７で円盤部８Ｃ、排出羽根体９Ｃは刈り刃から凸形状、中央部３３は刈り刃に密着した形状、図１３の回転受け具６の軸首部２４へのセットは巻き付き防止体２Ｃを上部に刈り刃１を下部に重ねてセット、締め付け具７とナット１９で締め付ける、セット時に巻き付き防止体２Ｃは薄い鉄板製で軽くセットがやり易い。
排出羽根体９Ｃの円盤部外周３５と排出面１０Ａで形成される円盤部外周から排出面に至る排出誘導面（Ｘ）を有する部分の排出面厚さｔを８〜１５ｍｍで構成されているから、切断草１４の排出が円滑に行われる。
刈刃先端の刈り取り軌跡円周より５〜２０ｍｍ小さいので、刈り取り田面は石が多いが石の接触回数が非常に少ない。
市場販売の刈り刃１は図１８の様な十字型形状で、巻き付き防止体２Ｃの裏側に補強板４０を溶着し、刈り刃内径面４２に挟み込む、この形態で巻き付き防止体２Ｃ型の排出羽根体９Ｃ部の強度が強くなる。
すなわち、上記取付板４０は、その裏面４１を巻き付き防止体２Ｃに突設されるそれぞれの排出羽根体９Ｃの裏側にスポット溶接で溶着されている。
この取付板４０は、取付板の段差部４３と刈り刃１の刈刃内径面４２との間に融通部Ｓが形成されており、段差部４３を刈り刃内径面４２に接当させた時に、反対側に位置する取付板４０の遊端部４４が刈り刃内径面４２から外れる関係に設定されており、これにより刈刃１に対して巻き付き防止体２Ｃを適宜に人為的にスライドさせながら、取付板４０を利用して差し込み固定するものである。取付板４０の遊端部４４は刈刃１の裏面側に密着して圧着する構成とされており、取り付けた後の作業状態では不測にずれる恐れがないものである。
15 to 19 exemplify and explain the wrapping preventing body of the third embodiment of the present invention. Compared to the anti-winding body 2B of the second embodiment, the difference from the anti-winding body 2C of the third embodiment is that the cutting blade is the third embodiment, whereas the second embodiment is a circular saw blade structure. Since the cutting blade 1 is different in the form of a four-blade type blade, the fixing method of the cutting blade 1 is fixed by the bolt in the anti-winding body 2B and fixed by the mounting plate 40 in the anti-winding body 2C. . Others are the same.
The wrapping prevention body 2C is made of a thin iron plate for weight reduction, the cross-sectional shape is a disk portion 8C, the discharge blade body 9C is a convex shape from the cutting blade in FIG. 17, the central portion 33 is a shape closely attached to the cutting blade, FIG. Set the rotation receiver 6 on the shaft neck 24 by setting the anti-winding body 2C on top and the cutting blade 1 on the bottom, and tightening with the tightening tool 7 and nut 19. The anti-winding body 2C is lightly made of a thin iron plate at the time of setting. Easy to set.
The discharge surface thickness t of the portion having the discharge guide surface (X) extending from the disk portion outer periphery to the discharge surface formed by the disk portion outer periphery 35 and the discharge surface 10A of the discharge blade body 9C is configured to be 8 to 15 mm. The cut grass 14 is discharged smoothly.
Since it is 5 to 20 mm smaller than the cutting locus circumference of the cutting blade tip, the cutting surface has a lot of stones, but the number of times of stone contact is very small.
The cutting blade 1 sold in the market has a cross shape as shown in FIG. 18, and a reinforcing plate 40 is welded to the back side of the anti-winding body 2C, and is sandwiched between the inner diameter surfaces 42 of the anti-winding body 2C. The strength of the body 9C part is increased.
That is, the mounting plate 40 is welded by spot welding to the back side of each discharge blade body 9 </ b> C projecting from the back surface 41 of the wrapping prevention body 2 </ b> C.
In this mounting plate 40, an interchangeable portion S is formed between the stepped portion 43 of the mounting plate and the cutting blade inner diameter surface 42 of the cutting blade 1, and when the stepped portion 43 is brought into contact with the cutting blade inner diameter surface 42. The free end portion 44 of the mounting plate 40 located on the opposite side is set so as to be disengaged from the cutting blade inner diameter surface 42, so that the wrapping prevention body 2 </ b> C is appropriately artificially slid with respect to the cutting blade 1. The fixing plate 40 is used for insertion and fixing. The free end portion 44 of the mounting plate 40 is configured to be in close contact with the back side of the cutting blade 1 and crimped, and there is no possibility of unexpected displacement in the work state after mounting.
図２１と図２２の構造では巻き付き防止体８Ｄと刈り刃１がプレス加工等により１体成形で構成される。この場合には一体であるが故に軽い構成になること、がたつきの生じる恐れがないことなどで刈り刃の回転が常に円滑にできて、刈り払い作業がさらにスムースに効率よく遂行できる利点がある。 In the structure shown in FIGS. 21 and 22, the wrapping preventing body 8D and the cutting blade 1 are formed as a single body by press working or the like. In this case, since it is integrated, it has a light structure, and there is no risk of rattling, so that the cutting blade can always rotate smoothly, and the mowing operation can be performed more smoothly and efficiently. .
図２３〜２５の構造では巻き付き防止体２Ｅと刈り刃１は別体で構成され、巻き付き防止体２Ｅの中央部下面４６は巻き付き防止体２Ｅの外周部下端の接点４７（刈り刃上面４８より）２〜５ｍｍ浅く押圧部４５に構成され、刈り刃１と巻き付き防止体２Ｅをナット１９で締め付けた時、押圧部４５があるので刈り刃がその弾力に抗して反る程度に締め付けられる、巻き付き防止体２Ｅと刈り刃１の接点４７は強力な力で締め付けられるので、接点４７には隙間はない、円盤部外周３５と刈り刃１との間に草等の巻き込みがなくなり、消費馬力の軽減化が図られる。
平面視で円盤部８Ｅより外方に放射方向に突出する羽根状の排出羽根体９Ｅを設け、該排出羽根体９Ｅの排出面１０Ｅの角度を回転方向の後方にやや後退させる後退角を有する形態にして、排出面１０Ｅの厚さは８〜１５ｍｍに構成する共に、刈刃１先端の刈り取り軌跡円周より５〜２０ｍｍ同外径より小さめにし、円盤部８Ｅ外周から排出面１０Ｅに至る排出誘導面Ｘを有するようにして円盤部８Ｅに等間隔に設けられる排出面は４個で構成される。
図２４は図２３の断面Ｙ−Ｙで、図２５は図２３の断面Ｚ−Ｚである。
23 to 25, the anti-winding body 2E and the cutting blade 1 are configured separately, and the lower surface 46 of the central portion of the anti-winding body 2E is a contact 47 (from the upper surface 48 of the cutting blade) at the lower end of the outer periphery of the anti-winding body 2E. 2-5 mm shallowly formed in the pressing part 45, when the cutting blade 1 and the wrapping prevention body 2E are tightened with the nut 19, the pressing part 45 is present so that the cutting blade is tightened to the extent that it warps against its elasticity. Since the contact point 47 between the prevention body 2E and the cutting blade 1 is tightened with a strong force, there is no gap in the contact point 47, and there is no entanglement of grass or the like between the disk portion outer periphery 35 and the cutting blade 1, thereby reducing the power consumption. Is achieved.
A blade-like discharge blade body 9E that protrudes radially outward from the disk portion 8E in a plan view is provided, and has a receding angle that causes the angle of the discharge surface 10E of the discharge blade body 9E to slightly move backward in the rotational direction. Thus, the thickness of the discharge surface 10E is 8 to 15 mm, and it is 5 to 20 mm smaller than the outer circumference of the cutting locus circle at the tip of the cutting blade 1, and discharge guidance from the outer periphery of the disk portion 8E to the discharge surface 10E. Four discharge surfaces are provided on the disk portion 8E at equal intervals so as to have the surface X.
24 is a cross section YY of FIG. 23, and FIG. 25 is a cross section ZZ of FIG.
この発明は、雑草の刈り取り等に使用される刈払機に利用される。 The present invention is used for a brush cutter used for weed cutting and the like.
１ 刈り刃
２Ａ 巻き付き防止体
２Ｂ 〃
２Ｃ 〃
２Ｄ 〃
３ 本体部ケ−シング
４ 柄
５ 回転軸
６ 回転受け具
７ 締め付け具
８Ａ 円盤部
８Ｂ 〃
８Ｃ 〃
８Ｄ 〃
９Ａ 排出羽根体
９Ｂ 〃
９Ｃ 〃
９Ｄ 〃
１０ 排出補強体
１０Ａ 排出面
１０Ｂ 〃
１０Ｃ 〃
１０Ｄ 〃
１１ 刈り払い機
１３ 草
１４ 切断草
１５ 携帯用バンド
１６ 刈り取り空間
１７ 放出羽根角度
１８ 飛散防止体
３０ 孔
３１ ボルト
３５ 円盤部外周
４０ 取付板
４５ 押圧部
４６ 中央部下面
４７ 接点
Ｘ 排出誘導面
1 Cutting blade 2A Winding prevention body 2B
2C 〃
2D 〃
3 Body part casing 4 Handle 5 Rotating shaft 6 Rotating support 7 Clamping tool 8A Disk part 8B 〃
8C 〃
8D 〃
9A discharge blade body 9B
9C 〃
9D 〃
10 Discharge reinforcement 10A Discharge surface 10B
10C 〃
10D 〃
DESCRIPTION OF SYMBOLS 11 Mower 13 Grass 14 Cutting grass 15 Portable band 16 Mowing space 17 Discharge vane angle 18 Scatter prevention body 30 Hole 31 Bolt 35 Disk part outer periphery 40 Mounting plate 45 Press part 46 Center part lower surface 47 Contact X Discharge induction surface
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011222137A JP2012228240A (en) | 2011-04-15 | 2011-10-06 | Bush cutter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011090990 | 2011-04-15 | ||
| JP2011090990 | 2011-04-15 | ||
| JP2011222137A JP2012228240A (en) | 2011-04-15 | 2011-10-06 | Bush cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2012228240A true JP2012228240A (en) | 2012-11-22 |
Family
ID=47430375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2011222137A Pending JP2012228240A (en) | 2011-04-15 | 2011-10-06 | Bush cutter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2012228240A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104041236A (en) * | 2014-07-01 | 2014-09-17 | 宫电高周波设备（上海）有限公司 | Cutting machine |
| KR20180041371A (en) * | 2016-10-14 | 2018-04-24 | (주)아이디알 | A lawn mower blade having a blade guide |
-
2011
- 2011-10-06 JP JP2011222137A patent/JP2012228240A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104041236A (en) * | 2014-07-01 | 2014-09-17 | 宫电高周波设备（上海）有限公司 | Cutting machine |
| KR20180041371A (en) * | 2016-10-14 | 2018-04-24 | (주)아이디알 | A lawn mower blade having a blade guide |
| KR101864945B1 (en) * | 2016-10-14 | 2018-06-05 | (주)아이디알 | A lawn mower blade having a blade guide |
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