JP6539613B2 - lawn mower - Google Patents

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JP6539613B2
JP6539613B2 JP2016077217A JP2016077217A JP6539613B2 JP 6539613 B2 JP6539613 B2 JP 6539613B2 JP 2016077217 A JP2016077217 A JP 2016077217A JP 2016077217 A JP2016077217 A JP 2016077217A JP 6539613 B2 JP6539613 B2 JP 6539613B2
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spiral
hole
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JP2017184677A (en
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善哲 脇坂
善哲 脇坂
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株式会社大進
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この発明は、水平方向に取り付けられた回転刃と、回転刃の切れ刃に押圧するように配置した固定刃によって刈取を行う芝刈り機に関する発明である。   The present invention relates to a lawn mower that performs cutting using a rotary blade attached in the horizontal direction and a fixed blade arranged to press against the cutting edge of the rotary blade.

芝刈り機には、複数の螺旋刃を備えた回転刃を本体フレームに水平方向に配置し、螺旋刃の先端である回転刃の切り刃の回転軌跡に、当接するように固定刃を配置し、回転刃と固定刃によって刈取を行う芝刈り機が知られている。この種芝刈り機においては、特許文献1に開示されるように、回転刃の切れ刃と固定刃の切れ刃のクリアランスを刈取に適した状態にバネで維持するように調節するのが普通である。このとき、固定刃が回転刃の回転軌跡内に突出しないようにして噛み込みを防止する。すなわち、微小なクリアランスに調整する。   In the mower, a rotary blade provided with a plurality of spiral blades is arranged horizontally on the main body frame, and a fixed blade is arranged to abut on the rotational trajectory of the cutting blade of the rotary blade which is the tip of the spiral blade. A mower is known which reaps by means of a rotary blade and a fixed blade. In this type of lawn mower, as disclosed in Patent Document 1, it is common to adjust the clearance between the cutting edge of the rotary blade and the cutting edge of the fixed blade so as to maintain a spring suitable condition for cutting. is there. At this time, the fixed blade is prevented from protruding into the rotation trajectory of the rotary blade to prevent biting. That is, it adjusts to a minute clearance.

回転刃の切り刃と固定刃のクリアランスに、被切断物が入り込んでしまうと良好な切断状態を実現することができない。したがって、回転刃の切り刃と固定刃は常時当接していること、あるいは押圧状態にあるのが切断機能の上では好ましい。しかしながら、固定刃が回転刃に対して押圧状態にあると、固定刃の当接位置が次位の螺旋刃との当接状態に移動するときに、固定刃が螺旋刃に噛み込んでしまう可能性があった。
特許文献2及び3には回転刃の一端に円板状の噛み込み防止板を配置し、この噛み込み防止板に固定刃を当接させることによって、固定刃が回転刃の回転軌跡内に入り込んで、固定刃が回転刃に噛み込むのを防止する思想が開示されている。
If the object to be cut enters into the clearance between the cutting blade of the rotary blade and the fixed blade, a good cutting state can not be realized. Therefore, it is preferable from the viewpoint of the cutting function that the cutting blade of the rotary blade and the fixed blade are always in contact or in a pressed state. However, when the fixed blade is in a pressing state with respect to the rotary blade, the fixed blade may bite into the spiral blade when the contact position of the fixed blade moves to a contact state with the next spiral blade. There was a sex.
In Patent Documents 2 and 3, a disk-like biting prevention plate is disposed at one end of the rotary blade, and the fixed blade is brought into the rotation trajectory of the rotary blade by bringing the fixed blade into contact with the biting prevention plate. The idea of preventing the fixed blade from biting into the rotary blade is disclosed.

回転刃の一端部で固定刃を支持することによって、固定刃の噛み込みを防止する従来の技術では、噛み込み防止板の反対側で固定刃が噛み込むのを完全に防止することができない。特に、芝の切断を完全なものとするため、強い力で押圧させようとする場合は噛み込みの危険性が大きくなるとともに、固定刃の端部の同じ位置が常時当接しているため、固定刃が部分的に大きく磨滅する可能性がある。特許文献3では、バネの弾性力の分力による、弱い力で固定刃を回転刃に押圧させることによって、安定した切断状況を実現する思想が開示されている。   By supporting the fixed blade at one end of the rotary blade, the conventional technique for preventing the fixed blade from biting can not completely prevent the fixed blade from being bitten on the opposite side of the biting prevention plate. In particular, in order to complete cutting of the turf, the risk of biting increases when pressing with a strong force, and the same position of the end of the fixed blade always abuts, so fixation The blade may be partially worn away. Patent Document 3 discloses a concept of realizing a stable cutting condition by pressing a fixed blade against a rotary blade with a weak force by a component force of an elastic force of a spring.

特開2013−13380号公報JP, 2013-13380, A 実用新案登録第3030764号公報Utility model registration No. 3030764 特開2007−166987号公報JP 2007-166987A

特許文献3に開示されるように、バネの分力によって固定刃を常時回転刃に押圧し、回転刃の一端部に配置した噛み込み防止板によって噛み込みを防止しようとするもであっても、固定刃の噛み込みを完全に防止するのは困難であるとともに、噛み込み防止板と固定刃の当接位置が同じ位置であるため、その部分が磨滅し易いことに変わりがない。また、押圧力が弱いと芝などの切断力に劣る欠点がある。
上記欠点に鑑み、本発明は、固定刃と回転刃の噛み込みをより確実に防止するとともに、回転刃と固定刃を比較的大きな力で押圧させることによって良好な切断力、例えば固い草の切断を容易に行うことができる、芝刈り機を実現することを目的とするものである。また、固定刃の部分的な磨滅を回避し、安定した切断状態を維持することができる構造を実現することを目的とするものである。
As disclosed in Patent Document 3, even if the fixed blade is always pressed against the rotary blade by the component force of the spring, the biting prevention plate disposed at one end of the rotary blade is also intended to prevent biting. Since it is difficult to completely prevent biting of the fixed blade, and because the contact position between the biting prevention plate and the fixed blade is the same position, the part is easily worn away. In addition, when the pressing force is weak, there is a disadvantage that the cutting force of grass etc. is inferior.
In view of the above-mentioned drawbacks, the present invention more reliably prevents biting of the fixed blade and the rotary blade, and presses the rotary blade and the fixed blade with a relatively large force so as to cut a good cutting force, for example, hard grass It is an object of the present invention to realize a lawn mower that can easily perform the Another object of the present invention is to realize a structure capable of avoiding partial abrasion of the fixed blade and maintaining a stable cutting state.

上記、目的を達成する請求項1に記載の本発明に係る芝刈り機は、複数の螺旋刃3、3を備え、本体フレーム1の水平方向に取り付けられる回転刃2と、該回転刃2の螺旋刃3の先端である切り刃3aに押圧させるように、回転刃2と平行に固定刃6を配置し、固定刃6と回転刃2の間で刈り取りを行う。
複数の螺旋刃3、3は、回転軸4の同心軸上の等間隔に配置し、この螺旋刃3、3の両端に回転軸の中心から一定寸法であって螺旋刃3の切り刃3aまでの寸法に等しい外周面5aを備えた弧状の延長部5を形成する。この延長部5は、次位の螺旋刃3に接合して螺旋刃3の切り刃3aと延長部5の外周面5aを面一に形成する。
A lawn mower according to the present invention as set forth in claim 1, which achieves the above object, comprises: a rotary blade 2 having a plurality of spiral blades 3, 3 mounted in the horizontal direction of the main body frame 1; The fixed blade 6 is disposed in parallel with the rotary blade 2 so as to press the cutting blade 3 a which is the tip of the spiral blade 3, and cutting is performed between the fixed blade 6 and the rotary blade 2.
The plurality of spiral blades 3, 3 are arranged at equal intervals on the concentric axis of the rotation shaft 4, and both ends of the spiral blades 3, 3 are of a fixed size from the center of the rotation shaft to the cutting blade 3a of the spiral blade 3. Form an arc-shaped extension 5 with an outer circumferential surface 5a equal to the dimension of. The extension 5 is joined to the next spiral blade 3 to form the cutting edge 3a of the spiral blade 3 and the outer peripheral surface 5a of the extension 5 flush with each other.

そして螺旋刃の延長部5の形状について、螺旋刃3の両端に形成する延長部5は、螺旋刃3の両端位置から次位の螺旋刃の内方に向けて延長し、次位の螺旋刃の外方端よりも内方位置に接合することである。 With respect to the shape of the extension 5 of the spiral blade, the extensions 5 formed at both ends of the spiral blade 3 extend from the both end positions of the spiral blade 3 toward the inner side of the next spiral blade, and the next spiral blade It is to join to the inward position rather than the outward end of.

請求項記載の発明は、固定刃6の支持構造に関するものである。固定刃6は、回転刃2と平行に配置した支持軸7に沿った平板部8aと該平板部8aの両端に垂直壁8bを備えた支持板8の平板部8aに固定し、前記支持板8の垂直壁8bに前記支持軸7の両端を軸支させ、前記支持板8の垂直壁8bに外側方に向けて形成した連結板9を本体フレーム1側壁に穿設した窓孔10から本体フレーム1の外側方に突出させるとともに、本体フレーム1の外側面には、窓孔10の上方に上固定板11と下固定板12を突出させる。
前記連結板9と下固定板12及び上固定板11にそれぞれ貫通孔を穿設し、連結板9の貫通孔13と下固定板12の貫通孔15及び上固定板11の貫通孔14を貫通させて吊り下げ杆16を装着する。吊り下げ杆16の下端に上方への抜け止め部17と上端に大径部18を形成し、下固定板12の貫通孔15は吊り下げ杆16の軸部が通過する小径孔に、上固定板11の貫通孔14は吊り下げ杆16の大径部18が通過する大径孔とする。この状態で、下固定板12と吊り下げ杆16の大径部18の間にコイルバネ19を配置し、該コイルバネ19の弾性によって固定刃6を常時回転刃2に押圧させるものである。
The invention according to claim 2 relates to a support structure of the fixed blade 6. The fixed blade 6 is fixed to the flat plate portion 8a of the support plate 8 provided with the flat plate portion 8a along the support shaft 7 arranged in parallel with the rotary blade 2 and the vertical wall 8b at both ends of the flat plate portion 8a. Both ends of the support shaft 7 are pivotally supported by the vertical wall 8b of the main body 8, and a connecting plate 9 formed outward on the vertical wall 8b of the support plate 8 is bored in the side wall of the main body frame 1 through the window hole 10 The upper fixed plate 11 and the lower fixed plate 12 are made to project above the window hole 10 on the outer side surface of the main body frame 1 while projecting the frame 1 outward.
A through hole is formed in each of the connecting plate 9, the lower fixing plate 12 and the upper fixing plate 11, and the through hole 13 of the connecting plate 9 and the through hole 15 of the lower fixing plate 12 and the through hole 14 of the upper fixing plate 11 are penetrated. Let it hang up and attach the hanging rod 16. Upward retaining portion 17 is formed at the lower end of suspension rod 16 and large diameter portion 18 is formed at the upper end, and the through hole 15 of lower fixing plate 12 is fixed to the small diameter hole through which the shaft portion of suspension rod 16 passes. The through hole 14 of the plate 11 is a large diameter hole through which the large diameter portion 18 of the hanging rod 16 passes. In this state, a coil spring 19 is disposed between the lower fixed plate 12 and the large diameter portion 18 of the hanging rod 16, and the fixed blade 6 is constantly pressed against the rotary blade 2 by the elasticity of the coil spring 19.

請求項1記載の本発明芝刈り機によれば、固定刃6の両端部は常に螺旋刃3の延長部5、5に当接する、すなわち安定よく支持され、ガタツキなどがなく固定刃6の螺旋刃3に対する噛み込みを効果的に防止することができる。また、固定刃6は、常時回転刃に押圧され、両端部が延長部5によって支持されることによって、螺旋刃3と固定刃6の押圧状態が安定し、一定の切断状態(条件)を維持することができる。すなわち、延長部5の外周面と螺旋刃3の切り刃3aが面一であることによって、固定刃6が回転刃2に押圧されるものであっても、連続的に固定刃6と回転刃2が当接し、固定刃6の部分的な磨滅の可能性が少なく、安定した切断状態を維持することができる。   According to the lawnmower of the present invention according to claim 1, both ends of the fixed blade 6 always abut the extensions 5 and 5 of the spiral blade 3, that is, it is stably supported and the spiral of the fixed blade 6 does not rattle. Biting of the blade 3 can be effectively prevented. In addition, the fixed blade 6 is always pressed by the rotary blade, and both ends are supported by the extension 5 so that the pressed state of the spiral blade 3 and the fixed blade 6 becomes stable, and a constant cutting state (condition) is maintained. can do. That is, even if the fixed blade 6 is pressed by the rotary blade 2 because the outer peripheral surface of the extension 5 and the cutting blade 3a of the spiral blade 3 are flush, the fixed blade 6 and the rotary blade can be continuously formed. 2 abuts, there is little possibility of partial abrasion of the fixed blade 6, and a stable cutting state can be maintained.

そして、固定刃6と、回転刃2の延長部5との当接位置が常時移動するため、固定刃6の部分的な磨滅を少なくすることができる。また、延長部5と固定刃6の当接位置が移動することによって、この部分での芝の切断作用が生じる。特に、回転刃2の回転速度に対して固定刃6の幅方向の移動が少ない状態で切断することになるため、強い切断力を実現することができる。したがって回転刃の両側に切り残しを生じにくいものとすることができる。 And since the contact position of the fixed blade 6 and the extension part 5 of the rotary blade 2 always moves, partial abrasion of the fixed blade 6 can be reduced. In addition, movement of the contact position between the extension 5 and the fixed blade 6 causes a cutting action of the turf at this portion. In particular, since cutting is performed in a state in which the movement of the fixed blade 6 in the width direction is small with respect to the rotational speed of the rotary blade 2, a strong cutting force can be realized. Therefore, it is possible to make it difficult to cause uncuts on both sides of the rotary blade.

請求項記載の発明によれば、固定刃6をコイルバネ19の力で常時回転刃2に押圧させることができ、より安定した切断状態を実現することができる。また、固定刃6を引き上げて回転刃2に押圧する吊り下げ杆16は、上固定板11の貫通孔14と下固定板12の貫通孔15を貫通した状態で、固定刃6を支持している支持板8の連結板9を引き上げるため、固定刃6が振れることなく安定的に作動させることができる。また、コイルバネ19の比較的強い力で固定刃6を作用させることができる。すなわち、本発明は、固定刃6を強い力で螺旋刃3の切り刃3aに押圧しても噛み込むことなく、良好な切断状態を実現することができるものである。
According to the second aspect of the present invention, the fixed blade 6 can always be pressed against the rotary blade 2 by the force of the coil spring 19, and a more stable cutting state can be realized. Further, the hanging rod 16 for pulling up the fixed blade 6 and pressing it to the rotary blade 2 supports the fixed blade 6 in a state of penetrating the through hole 14 of the upper fixed plate 11 and the through hole 15 of the lower fixed plate 12. In order to pull up the connecting plate 9 of the supporting plate 8, the fixed blade 6 can be stably operated without swinging. Also, the fixed blade 6 can be operated by the relatively strong force of the coil spring 19. That is, according to the present invention, even when the fixed blade 6 is pressed against the cutting blade 3a of the spiral blade 3 with a strong force, a good cutting state can be realized without biting.

図1は、本発明の実施形態を示す芝刈り機の平面図、FIG. 1 is a plan view of a mower showing an embodiment of the present invention; 図2は、図1に示す芝刈り機の側面図、2 is a side view of the mower shown in FIG. 図3は、図1に示す芝刈り機の固定刃の構造を示す側面図、Fig. 3 is a side view showing the structure of the fixed blade of the mower shown in Fig. 1; 図4は、図3のIV−IV線断面図、4 is a cross-sectional view taken along line IV-IV in FIG. 図5は、回転刃のみの斜視図、Figure 5 is a perspective view of the rotary blade only; 図6は、回転刃のみの正面図。FIG. 6 is a front view of only the rotary blade.

以下、本発明に係る芝刈り機の実施形態を添付の図面に基づいて説明する。
図1は本発明に係る芝刈り機の平面図、図2は側面図、図3は固定刃の構造である。
Hereinafter, an embodiment of a lawn mower according to the present invention will be described based on the attached drawings.
FIG. 1 is a plan view of a lawn mower according to the present invention, FIG. 2 is a side view, and FIG. 3 is a structure of a fixed blade.

図示実施形態の芝刈り機は、左右の側板1a、1aの前方部分を連結部材1bで、連結して本体フレーム1を構成している。本体フレーム1の側板1a、1a間には、複数の螺旋刃3、3、図示実施形態では5枚の螺旋刃を備えた回転刃2を水平方向に取り付けるとともに、螺旋刃3の先端である切り刃3aの回転軌跡に接するように回転刃2と平行に固定刃6を配置している。この芝刈り機は、本体フレーム1を移動させることによって回転刃2を回転させ、回転刃2を構成している螺旋刃3先端の切り刃3aと、固定刃6先端の切り刃6aのせん断作用によって芝の刈取を行なう。   The lawn mower of the illustrated embodiment forms the main body frame 1 by connecting the front portions of the left and right side plates 1a, 1a with a connecting member 1b. Between the side plates 1 a of the body frame 1, a rotary blade 2 having a plurality of spiral blades 3, 3 and five spiral blades in the illustrated embodiment is horizontally mounted between the side plates 1 a and 1 a The fixed blade 6 is disposed in parallel with the rotary blade 2 so as to be in contact with the rotational trajectory of the blade 3a. This lawn mower rotates the rotary blade 2 by moving the main body frame 1 so that the shearing action of the cutting blade 3 a at the tip of the spiral blade 3 constituting the rotary blade 2 and the cutting blade 6 a at the tip of the fixed blade 6 Mow the grass by

本体フレーム1の側板1aには、前半部の外側面に車輪20、20を軸支するとともに、本体フレーム1の側板1a、1aの後端部に架設するようにガイドローラ21を配置し、車輪20とガイドローラ21を接地させて、本体フレーム1を移動させることによって回転刃2を回転させている。すなわち、図示していないが、本体フレーム1の外側面に配置する車輪20の内部に内歯歯車を形成し、回転刃2の回転軸4の先端に装着したピニオンを、前記内歯歯車に噛合させることによって、車輪20の回転に連動して回転刃2を回転させるようにしている。   A guide roller 21 is disposed on the side plate 1a of the main body frame 1 so as to support the wheels 20, 20 on the outer surface of the front half and to bridge the rear end of the side plates 1a, 1a of the main body frame 1 The rotary blade 2 is rotated by moving the main body frame 1 by grounding the guide roller 20 and the guide roller 21. That is, although not shown, an internal gear is formed inside the wheel 20 disposed on the outer surface of the main body frame 1, and a pinion mounted at the tip of the rotary shaft 4 of the rotary blade 2 is engaged with the internal gear. By rotating the rotary blade 2 in conjunction with the rotation of the wheel 20, the rotary blade 2 is rotated.

回転刃2を形成する螺旋刃3の先端である切り刃3aの回転軌跡に接する位置に配置する固定刃6は、回転刃2と平行に配置するものであるが、回転刃2に向けて押圧することができるようにしている。
すなわち、固定刃6は支持板8に固定している。支持板8は、本体フレーム1の幅方向に延びる平面部8aと、その両端を折曲した垂直壁8bとで構成し、平面部8aに固定刃6を固定し垂直壁8bを支持軸7によって本体フレーム1に軸支させている。支持軸7によって軸支させた支持板8を前方に回動させることによって、支持板8に固定している固定刃6の前端、すなわち切り刃6aを回転刃2の螺旋刃3の切り刃3aに押圧することができる。
The fixed blade 6 disposed at a position in contact with the rotational trajectory of the cutting blade 3 a which is the tip of the spiral blade 3 forming the rotary blade 2 is disposed parallel to the rotary blade 2. I am able to do that.
That is, the fixed blade 6 is fixed to the support plate 8. The support plate 8 is composed of a flat portion 8a extending in the width direction of the main body frame 1 and a vertical wall 8b having its both ends bent, the fixed blade 6 is fixed to the flat portion 8a, and the vertical wall 8b is supported by the support shaft 7 It is pivotally supported by the main body frame 1. By rotating the support plate 8 axially supported by the support shaft 7 forward, the front end of the fixed blade 6 fixed to the support plate 8, that is, the cutting blade 6a is the cutting blade 3a of the spiral blade 3 of the rotary blade 2. Can be pressed.

支持板8には、図3から理解されるように、外方に向けて連結板9、9を突出形成している。すなわち、支持板8の平面部8aの両端に位置する垂直壁8bの上縁前方部分に外方に向けて、連結板9を折曲形成し、この連結板9を本体フレーム1の側板1aに穿設した窓孔10から外方に突出させている。
連結板9を外方に突出させる窓孔10の直上位置には、本体フレーム1の側板1aに、上下一対の上固定板11と下固定板12を外方に向けて突出させている。図示実施形態においては、断面略コ字状とした部材を側板1aに溶着し、コ字状部材の上辺を上固定板11、下辺を下固定板12としている。勿論、上固定板11と下固定板12は分離されたものであってもよい。
On the support plate 8, as is understood from FIG. 3, the connection plates 9, 9 are formed so as to project outward. That is, the connection plate 9 is bent outward on the upper edge front portion of the vertical wall 8b located at both ends of the flat portion 8a of the support plate 8, and the connection plate 9 is formed on the side plate 1a of the main body frame 1 It is made to project outward from the perforated window hole 10.
A pair of upper and lower fixed plates 11 and 12 is made to project outward on the side plate 1 a of the main body frame 1 at a position immediately above the window hole 10 where the connecting plate 9 projects outward. In the illustrated embodiment, a member having a substantially U-shaped cross section is welded to the side plate 1a, and the upper side of the U-shaped member is an upper fixed plate 11 and the lower side is a lower fixed plate 12. Of course, the upper fixed plate 11 and the lower fixed plate 12 may be separated.

前記、上固定板11、下固定板12及び連結板9には、上下一直線上にそれぞれ貫通孔14、15、13を穿設し、これら貫通孔を貫通させて吊り下げ杆16を設置している。吊り下げ杆16は、軸部16aの上端に大径部18を形成し、下端に抜け止め部17を装着することができるものとしている。吊り下げ杆16として、例えば六角穴付きボルトを利用する。
吊り下げ杆16を貫通させる連結板9の貫通孔13、下固定板12の貫通孔15は、吊り下げ杆16の軸部16aが、大きな隙間がない状態で遊貫通する孔径、例えば軸部16aの直径よりも1mm程度大きな直径の貫通孔とする。特に、下固定板の貫通孔15の大きさは、軸部16aにコイルバネ19を装着したときに、軸部16aが通過し、コイルバネ19が通過せずに支持される大きさとする。一方、上固定板11の貫通孔14は、大径部18、図示実施形態においては六角穴ボルトの頭部が通過する大径の孔とする。
In the upper fixed plate 11, lower fixed plate 12 and connection plate 9, through holes 14, 15 and 13 are respectively formed in a straight line in the vertical direction, and the through holes are penetrated to set a hanging rod 16 There is. The hanging rod 16 has a large diameter portion 18 at the upper end of the shaft portion 16a, and can be fitted with the retaining portion 17 at the lower end. For example, a hexagonal socket bolt is used as the hanging rod 16.
The through holes 13 of the connection plate 9 through which the suspension rod 16 penetrates and the through holes 15 of the lower fixing plate 12 have a hole diameter through which the shaft 16a of the suspension rod 16 passes freely without a large gap, for example, the shaft 16a The through hole has a diameter about 1 mm larger than the diameter of In particular, the size of the through hole 15 of the lower fixing plate is such that when the coil spring 19 is attached to the shaft portion 16a, the shaft portion 16a passes and the coil spring 19 is supported without passing. On the other hand, the through hole 14 of the upper fixing plate 11 is a large diameter hole through which the large diameter portion 18, in the illustrated embodiment, the head of the hexagonal hole bolt passes.

固定刃6を固定した支持板8を本体フレーム1に装着するには、吊り下げ杆16の軸部16aにコイルバネ19挿入し、コイルバネ19を大径部18に支受させた状態で、吊り下げ杆16を上固定板11の貫通孔14と、下固定板12の貫通孔15及び連結板9の貫通孔13を貫通させて装着し、軸部16aの先端に抜け止め部17、具体的にはナットを固定する。
抜け止め部17によって支持板8の連結板9を支受する吊り下げ杆16は、下固定板12と大径部18の間に挿入したコイルバネ19によって上方に付勢される。すなわち、支持板8はコイルバネ19の弾性によって常時上方に引き上げられ、回転刃2に押圧される。
このとき、吊り下げ杆16は、貫通孔13,14,15を貫通しているため、安定的に保持され、コイルバネ19に無理な力が作用することがない。特に、図示実施形態のように、上固定板11と下固定板12が断面略コ字状に形成されていると、コイルバネ19自体が、外部から保護されることになる。
In order to mount the support plate 8 to which the fixed blade 6 is fixed to the main body frame 1, the coil spring 19 is inserted into the shaft portion 16 a of the suspending rod 16, and the coil spring 19 is supported by the large diameter portion 18. The wedge 16 is inserted through the through hole 14 of the upper fixing plate 11, the through hole 15 of the lower fixing plate 12 and the through hole 13 of the connecting plate 9, and the tip of the shaft 16a Secure the nut.
The suspension rod 16 supporting the connection plate 9 of the support plate 8 by the retaining portion 17 is biased upward by a coil spring 19 inserted between the lower fixing plate 12 and the large diameter portion 18. That is, the support plate 8 is always pulled upward by the elasticity of the coil spring 19 and pressed by the rotary blade 2.
At this time, since the hanging rod 16 penetrates the through holes 13, 14 and 15, it is stably held, and no excessive force acts on the coil spring 19. In particular, when the upper fixed plate 11 and the lower fixed plate 12 are formed in a substantially U-shaped cross section as in the illustrated embodiment, the coil spring 19 itself is protected from the outside.

車輪20の回転と連動して回転をする回転刃2は、図5、図6に示すように、回転軸4の軸方向に等間隔で三カ所に配置した円板状の取付け板22、22に、螺旋刃3、3を円周上の等間隔(図示例では72度ごと)に固定している。螺旋刃3は、図示実施形態においては5枚とし、螺旋刃3の両端間で72度のねじれとなるようにし、回転刃2と平行に配置した固定刃6が、常に螺旋刃3の一カ所に接触し、接触抵抗にばらつきがなく安定した回転状態を維持するように配慮している。
螺旋刃3の両端部は、回転軸4の中心から一定寸法(径方向)であって螺旋刃3の切り刃3aまでの寸法に等しい外周面5aを備えた弧状の延長部5を次位の螺旋刃に向けて形成する。この延長部5は次位の螺旋刃3に接合し、螺旋刃3の切り刃3aと延長部5の外周面5aを面一に形成する。
The rotary blade 2 that rotates in conjunction with the rotation of the wheel 20 is, as shown in FIGS. 5 and 6, disc-shaped mounting plates 22 and 22 disposed at three locations at equal intervals in the axial direction of the rotary shaft 4. In addition, the spiral blades 3 are fixed at equal intervals on the circumference (every 72 degrees in the illustrated example). The number of the spiral blade 3 is five in the illustrated embodiment, and the fixed blade 6 disposed parallel to the rotary blade 2 is always arranged at one position of the spiral blade 3 so that a twist of 72 degrees is provided between both ends of the spiral blade 3. In order to maintain a stable rotation without variation in contact resistance.
Both ends of the spiral blade 3 are following the arc-shaped extension 5 having an outer peripheral surface 5a which has a constant dimension (radial direction) from the center of the rotary shaft 4 and is equal to the dimension from the cutting edge 3a of the spiral blade 3 Form towards the spiral blade. The extension 5 is joined to the next spiral blade 3 so that the cutting edge 3a of the spiral blade 3 and the outer peripheral surface 5a of the extension 5 are flush with each other.

上記構成とすることによって、固定刃6は常に螺旋刃3の両端に形成された延長部5の外周面5aに当接して摺動することになる。すなわち、固定刃6の両端部は延長部5によって支持され、回転刃2の直径の中心方向に移動する可能性、すなわち、噛み込む可能性がない。そのため、固定刃6をコイルバネ19の比較的強い力で押圧し続けても噛み込むことがなく、被切断物の切断を確実なものとすることができる効果がある。図示実施形態においては、常に螺旋刃3のいずれかの部分が、固定刃6の切り刃6aに当接して切断作用に寄与しているため、切削抵抗が安定するとともに切り残しの可能性が少ない。
切断作用を行う固定刃6と回転刃2の接触位置は、常時一カ所に限定される必要はなく、螺旋刃の螺旋角度や回転刃の軸方向寸法によって常時複数位置で切断が行われるようにすることもできる。
With the above configuration, the fixed blade 6 always abuts and slides on the outer peripheral surface 5 a of the extension 5 formed at both ends of the spiral blade 3. That is, both ends of the fixed blade 6 are supported by the extension 5 and there is no possibility of moving in the central direction of the diameter of the rotary blade 2, ie, there is no possibility of biting. Therefore, even if the fixed blade 6 continues to be pressed by the relatively strong force of the coil spring 19, it does not bite, and there is an effect that cutting of the object to be cut can be made reliable. In the illustrated embodiment, since any part of the spiral blade 3 always abuts on the cutting blade 6 a of the fixed blade 6 and contributes to the cutting action, the cutting resistance is stabilized and the possibility of uncut is small. .
The contact position between the fixed blade 6 and the rotary blade 2 that perform the cutting action does not have to be always limited to one place, and cutting is always performed at multiple positions depending on the helical angle of the spiral blade and the axial dimension of the rotary blade. You can also

螺旋刃3の両端部に形成する延長部5の延長方向は、回転軸4と直交する方向であってもよい。この場合、延長部5は螺旋刃3の両端部において円環状に現れて、噛み込み防止板として機能し、螺旋刃3の両端位置で固定刃6が支持されることになる。延長部5の外周面5aが固定刃6の同じ位置に、薄い厚みである細幅状態で接触し続けると、固定刃の接触部分に磨滅を生じる可能性があるが、図示実施形態のように延長部5が内方に向けて延長したものであると、固定刃6と延長部5との当接位置が変化する。これにより、固定刃6の部分的な磨滅を軽減することができる。   The extension direction of the extensions 5 formed at both ends of the spiral blade 3 may be orthogonal to the rotation axis 4. In this case, the extension 5 appears in an annular shape at both ends of the spiral blade 3 to function as a biting prevention plate, and the fixed blade 6 is supported at both end positions of the spiral blade 3. If the outer peripheral surface 5a of the extension 5 continues to be in contact with the fixed blade 6 at the same position in a thin state with a narrow width, the contact portion of the fixed blade may be worn away, but as in the illustrated embodiment When the extension 5 extends inward, the contact position between the fixed blade 6 and the extension 5 changes. Thereby, partial abrasion of the fixed blade 6 can be reduced.

延長部5は、回転軸4に対して直交する方向であってもよいが、図示実施形態のように、螺旋刃3の両端に形成する延長部5は、両端位置から次位の螺旋刃の内方に向けて延長し、次位の螺旋刃の外方端よりも内方位置に接合するのが好ましい。すなわち、螺旋刃の一端から内方に向けた傾斜で、次位の螺旋刃に向けて延長部を形成する場合、次位の螺旋刃には一端よりも内側に接合されることになる。延長部が一端よりも内側に接合された螺旋刃の一端からは、図5、図6から理解されるように、さらに次位置の螺旋刃に向けて延長部を形成する。   The extension 5 may be in a direction orthogonal to the rotation axis 4, but as shown in the illustrated embodiment, the extensions 5 formed at both ends of the spiral blade 3 are next to each other in the spiral blade from both end positions. It is preferable to extend inward and to join at an inner position rather than the outer end of the next helical blade. That is, in the case where the extension is formed inward from one end of the spiral blade to form the extension toward the next spiral blade, the next spiral blade is joined to the inside more than one end. From one end of the spiral blade where the extension is joined to the inside from the one end, as is understood from FIGS. 5 and 6, the extension is further formed toward the spiral blade in the next position.

図5や図6に示す実施形態では、回転刃2の螺旋刃3が常に固定刃6に接触する。そして、固定刃6と延長部5の接触位置が、回転軸4の軸方向に変化する。したがって、固定刃6に対して部分的な磨滅を発生する可能性が少なくなり、固定刃6を回転刃2に強く押圧するものであっても、円滑に回転させることができる。また、固定刃に対する回転刃の延長部の接触位置が軸方向に移動することは、部分的ではあるが被切断物の切断に寄与する。この接触位置の軸方向の移動は少ない距離であるため、強い切断力を発揮し、回転刃の一端に移動させられた腰の強い草などを切断することができる。   In the embodiments shown in FIG. 5 and FIG. 6, the spiral blade 3 of the rotary blade 2 always contacts the fixed blade 6. Then, the contact position between the fixed blade 6 and the extension 5 changes in the axial direction of the rotation shaft 4. Therefore, the possibility of partial abrasion of the fixed blade 6 is reduced, and even if the fixed blade 6 is strongly pressed against the rotary blade 2, it can be smoothly rotated. In addition, axial movement of the contact position of the extension of the rotary blade with respect to the fixed blade contributes to cutting of the workpiece although it is partial. Since the axial movement of the contact position is a small distance, a strong cutting force can be exerted to cut strong grass or the like moved to one end of the rotary blade.

その他、図において23はガイドローラ21の支持アームであって、先端部分にガイドローラ21の支持軸24を支持し、摘み25を引いて支持アームを回動させることによって回転刃2と固定刃6による切断位置の高さを変化させ、芝の刈り取りの高さを調節することができるものである。   In addition, in the figure, reference numeral 23 denotes a support arm of the guide roller 21. The support shaft 24 of the guide roller 21 is supported at the tip portion, and the rotary blade 2 and the fixed blade 6 are rotated by pulling the knob 25 to rotate the support arm. The height of the cutting position can be changed to adjust the height of the grass cutting.

1…本体フレーム、 1a…側板、 1b…連結部材、 2…回転刃、 3…螺旋刃、 3a…切り刃、 4…回転軸、 5…延長部、 5a…外周面、 6…固定刃、 6a…切り刃、 7…支持軸、 8…支持板、 8a…平面部、 8b…垂直壁、 9…連結板、 10…窓孔、 11…上固定板、 12…下固定板、 13、14、15…貫通孔、 16…吊り下げ杆、 17…抜け止め部、 18…大径部、 19…コイルバネ、 20…車輪、 21…ガイドローラ、 22…取付け板、 23…支持アーム、 24…支持軸、 25…摘み。 DESCRIPTION OF SYMBOLS 1 ... Body frame, 1a ... Side plate, 1b ... Connection member, 2 ... Rotary blade, 3 ... Spiral blade, 3a ... Cutting blade, 4 ... Rotational axis, 5 ... Extension part, 5a ... Outer peripheral surface, 6 ... Fixed blade, 6a ... Cutting blade 7. support shaft 8 support plate 8a flat portion 8b vertical wall 9 connection plate 10 window hole 11 upper fixed plate 12 lower fixed plate 13, 14 DESCRIPTION OF SYMBOLS 15 ... Through-hole, 16 ... Suspension rod, 17 ... Detachment prevention part, 18 ... Large diameter part, 19 ... Coil spring, 20 ... Wheel, 21 ... Guide roller, 22 ... Mounting plate, 23 ... Support arm, 24 ... Support shaft , 25 ... picking.

Claims (2)

複数の螺旋刃を備え本体フレームの水平方向に取り付けられる回転刃と、該回転刃の螺旋刃の先端である切り刃に押圧させるように、回転刃と平行に固定刃を配置し、固定刃と回転刃の間で刈り取りを行う芝刈り機において、
複数の螺旋刃を回転軸の同心軸上の等間隔に配置し、該螺旋刃の両端に回転軸の中心から一定寸法であって螺旋刃の切り刃までの寸法に等しい外周面を備えた弧状の延長部を形成し、該延長部を次位の螺旋刃に接合して螺旋刃の切り刃と延長部の外周面を面一に形成し
螺旋刃の両端に形成する延長部は、両端位置から次位の螺旋刃の内方に向けて延長し、次位の螺旋刃の外方端よりも内方位置に接合したことを特徴とする芝刈り機。
A fixed blade is disposed parallel to the rotary blade so as to press the rotary blade provided with a plurality of spiral blades in the horizontal direction of the main body frame and a cutting blade which is the tip of the spiral blade of the rotary blade, In mowers that reap between rotating blades,
An arc having a plurality of spiral blades arranged at equal intervals on the concentric axis of the rotation axis and having an outer peripheral surface at both ends of the spiral blade having a constant dimension from the center of the rotation axis and equal to the size to the cutting edge of the spiral blade Forming an extension portion of the spiral blade, and joining the extension portion to the next spiral blade to form a cutting edge of the spiral blade and an outer peripheral surface of the extension portion flush with each other ;
The extensions formed at both ends of the spiral blade are extended from the both ends toward the inner side of the next spiral blade and are joined to the inner position than the outer end of the next spiral blade. Lawn mower.
固定刃は、回転刃と平行に配置した支持軸に沿った平板部と、該平板部の両端に垂直壁を備えた支持板の平板部に固定し、前記支持板の垂直壁に前記支持軸の両端を軸支し、前記支持板の垂直壁に外側方に向けて形成した連結板を、本体フレーム側壁に穿設した窓孔から本体フレームの外側方に突出させるとともに、本体フレームの外側面に窓孔の上方に上固定板と下固定板を突出させ、前記連結板と下固定板及び上固定板にそれぞれ貫通孔を穿設し、連結板の貫通孔と下固定板の貫通孔及び上固定板の貫通孔を貫通させて吊り下げ杆を装着し、該吊り下げ杆の下端に上方への抜け止め部と上端に大径部を形成し、下固定板の貫通孔は吊り下げ杆の軸部が通過する小径孔に、上固定板の貫通孔は吊り下げ杆の大径部が通過する大径孔とし、下固定板と吊り下げ杆の大径部の間にコイルバネを配置し、該コイルバネの弾性によって固定刃を常時回転刃に押圧させることを特徴とする請求項1記載の芝刈り機。 The fixed blade is fixed to a flat plate portion along a support axis arranged parallel to the rotary blade, and a flat plate portion of a support plate provided with vertical walls at both ends of the flat plate portion, and the support shaft is fixed to the vertical wall of the support plate. And a connecting plate formed on the vertical wall of the support plate so as to axially support both ends of the support plate so as to protrude outward of the main body frame from a window hole bored in the side wall of the main body frame The upper fixing plate and the lower fixing plate are projected above the window hole, and through holes are formed respectively in the connecting plate, the lower fixing plate and the upper fixing plate, and the through holes of the connecting plate and the lower fixing plate A hanging rod is attached by penetrating the through hole of the upper fixing plate, an upward retaining portion at the lower end of the hanging rod and a large diameter portion at the upper end, and the through hole of the lower fixing plate is suspended In the small diameter hole through which the shaft of the shaft passes, the through hole of the upper fixed plate is a large diameter hole through which the large diameter portion of the hanging rod passes, The coil spring is disposed between the large diameter portion of the rod hanging and Teiita, lawn mower according to claim 1, characterized in that it pressed constantly rotating blade of the fixed blade by the elasticity of the coil spring.
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