JPH0870668A - Lawn mower - Google Patents
Lawn mowerInfo
- Publication number
- JPH0870668A JPH0870668A JP24054094A JP24054094A JPH0870668A JP H0870668 A JPH0870668 A JP H0870668A JP 24054094 A JP24054094 A JP 24054094A JP 24054094 A JP24054094 A JP 24054094A JP H0870668 A JPH0870668 A JP H0870668A
- Authority
- JP
- Japan
- Prior art keywords
- blade
- rotation
- speed rotary
- gear
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Harvester Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、芝や雑草の刈り取り
に利用することができる芝刈機に関し、特に外周部に櫛
歯状の受刃を形成した受刃板と、先端に切刃を設けた高
速回転刃で構成され、高速回転刃に設けた切刃が受刃板
の表面に摺接し受刃との間で剪断作用を行う芝刈機に係
る発明である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lawn mower that can be used for mowing lawns and weeds, and more particularly to a blade plate having comb-shaped blades formed on the outer periphery thereof and a cutting blade provided at the tip. The invention relates to a lawn mower that is configured by a high-speed rotary blade, and a cutting blade provided on the high-speed rotary blade is in sliding contact with the surface of a blade plate to perform a shearing action with the blade.
【０００２】[0002]
【従来の技術】従来のこの種芝刈機においては、外周部
に櫛歯状の受刃を形成した受刃板は固定されたものであ
って、高速回転刃のみが回転するのが普通であった。ま
た通常一枚の刈刃板が高速で回転する刈払機において、
刈刃板の高速回転による危険性を回避するため、上下二
つの刃板を使用し、上下二つの刃板を低速度で逆方向に
回転させ、外周部に形成した刈刃によって鋏のように作
用させる刈払機（特公平５−８５７８５号）も知られて
いる。2. Description of the Related Art In this type of conventional lawnmower, a blade plate having comb-shaped blades formed on the outer periphery is fixed, and only a high-speed rotary blade normally rotates. It was Also, in a brush cutter that normally rotates one cutting blade plate at high speed,
In order to avoid the danger of cutting blades rotating at high speed, use two blades, one upper and the other lower, rotate the upper and lower blades in opposite directions at a low speed, and use cutting blades formed on the outer circumference to make them look like scissors. A brush cutter to be operated (Japanese Patent Publication No. 5-85785) is also known.
【０００３】[0003]
【発明が解決しようとする課題】受刃板と高速回転刃と
で構成される従来の芝刈機では、受刃板が固定されてい
るため、図11に示すように(a) 受刃B1を通過した切刃Ａ
が、(b) 次位の受刃B2上を通過することによって受刃B1
とB2の間から突出する芝Ｃの先端部を切断する。このと
き、芝Ｃは受刃B2に向けて押し倒された状態で切断され
るため、芝の切断高さは図11の(c) にＸで示すように、
受刃B1に近い芝が長く残ることになる。これは次に切刃
Ａが通過しても同じであるため、作業終了後の芝生の仕
上がり面に高さのばらつきを生じることになる。従っ
て、刈り取られた芝生の高さを揃えるためには、何度も
同じ所を作業しなければならない。芝生高さのばらつき
を少なくするために、受刃B1，B2のピッチを短くするこ
とも考えられるが、その場合は受刃そのもので上から押
さえ付けられる芝、つまり芝刈りのデッドスペースが大
きくなって刈り残しを生じるため、全体の芝を刈り取る
にはやはり同じ所を何度も作業しなければならない。In a conventional lawnmower composed of a receiving blade plate and the high-speed rotary blade [0005] Since the receiving blade plate is fixed, as shown in FIG. 11 (a) receiving blades B 1 Cutting edge A that passed through
But receiving blades B 1 by passing over the receiving blade B 2 (b), next order
Cut off the tip of the grass C protruding from between B and B 2 . At this time, the lawn C is cut while being pushed down toward the receiving blade B 2 , so that the cutting height of the lawn is as shown by X in (c) of FIG.
Grass near the blade B 1 will remain for a long time. This is the same even when the cutting edge A passes next time, so that the finished surface of the lawn after the work has a variation in height. Therefore, in order to make the height of the mowed lawn uniform, the same place must be worked many times. It is possible to shorten the pitch of the blades B 1 and B 2 in order to reduce the unevenness of the lawn height, but in that case the lawn that is pressed down by the blades itself, that is, the dead space for lawn mowing, As it grows and leaves uncut material, it is necessary to work on the same place many times to cut the entire grass.
【０００４】また、上刃板と下刃板を逆方向に低速度で
回転させ鋏のように作用させる特公平５−８５７８５号
に開示される刈払機では、雑草を刈り取る刈払機として
は有効であるが、短い芝を多量に刈り取る芝刈機として
は高速回転刃による芝刈機のように鋭い切れ味で手際よ
く芝を刈ることはできず非能率的であるとともに、必ず
しも高さの揃った面に芝を刈り込むことができなかっ
た。Further, the brush cutter disclosed in Japanese Patent Publication No. 5-85785, in which the upper blade plate and the lower blade plate are rotated in opposite directions at a low speed to act like scissors, is effective as a brush cutter for cutting weeds. However, as a lawn mower that cuts a large amount of short lawn grass, it is inefficient because it cannot sharply cut the lawn as sharply as a lawn mower with a high-speed rotary blade, and it is not always efficient. Could not be trimmed.
【０００５】このような実情に鑑み、本発明は高速回転
刃によって切れ味よく能率的に芝を刈ることができる芝
刈機であって、刈り取られた芝の高さが一定となり、き
れいに高さがそろった芝生面に仕上げることができる芝
刈機を提供することを目的とするものである。In view of such circumstances, the present invention is a lawnmower capable of cutting grass efficiently and efficiently with a high-speed rotary blade, and the height of the cut grass is constant, and the height of the grass is neat. The present invention is intended to provide a lawn mower capable of finishing a lawn surface.
【０００６】[0006]
【課題を解決するための手段】本発明に係る芝刈機は、
外周部に櫛歯状の受刃２を形成した受刃板１と、先端部
に切刃４を備えた高速回転刃３とで構成し、外周部に櫛
歯状の受刃２を形成する受刃板１は、高速回転刃３とは
逆方向に低速度で回転させる。低速度で回転する受刃板
１の回転速度は、外周部に形成された櫛歯状の受刃２，
２の１ピッチ分を回動する間に少なくとも高速回転刃３
の切刃４が複数回通過する程度の回転数としておく。The lawnmower according to the present invention is
It is composed of a blade plate 1 having a comb-tooth-shaped receiving blade 2 formed on the outer peripheral portion and a high-speed rotary blade 3 having a cutting blade 4 at the tip thereof, and the comb-tooth-shaped receiving blade 2 is formed on the outer peripheral portion. The blade plate 1 is rotated at a low speed in the opposite direction to the high speed rotary blade 3. The rotation speed of the blade plate 1 that rotates at a low speed is as follows.
At least a high-speed rotary blade 3 while rotating one pitch of 2
The number of rotations is set so that the cutting blade 4 of FIG.
【０００７】[0007]
【作用】図９の(a) に示すように受刃21上を通過した切
刃４が、次位の受刃22に達すると、(b) に示すように切
刃４によって受刃21と受刃22の間の空間から表面に突出
する芝が受刃22側に押し倒されて切刃４と受刃22とで切
断される。このときの切断状況は、(c) に示すように受
刃22の近くが低く、受刃21の近くが高くなって切断され
た芝が不揃いとなっている。図９において、受刃21の近
くにある指標芝を太線で表し、これが最も背が高い状態
となっている。When the cutting blade 4 which has passed over the receiving blade 2 1 reaches the next receiving blade 2 2 as shown in FIG. 9 (a), the cutting blade 4 receives the blade as shown in FIG. 9 (b). grass protruding from the space between the 2 1 and receiving blades 2 2 on the surface is pushed down to the receiving blades 2 2 side is cut at the cutting edge 4 and the receiving blade 2 2. Cutting conditions at this time is (c) are shown as receiving blade 2 2 low near grass cut becomes high near the receiving blades 2 1 and uneven. 9 represents an index grass near the receiving blades 2 1 by thick lines, and this is a tallest state.
【０００８】高速回転刃３の切刃４が、次に同じ位置を
通過しようとするときには、(d) に示すように受刃22が
少し受刃21の方向に移動しており、先に押し倒されてい
た芝が順次掬い上げるように起こされて切断され、指標
芝は(e) のように受刃21と22の中間位置にあってやや短
く切断される。同じように、次回の切刃４の移動によっ
て、(f),(g) のように切断され、指標芝は最も短い状態
に切断される。このように受刃２が、切刃４とは逆方向
に低速で移動することによって、刈り取られる芝生面に
ある芝が順次掬い起こされながら複数回の切断作用に晒
され、最も短い所望の高さに切断されることになる。When the cutting blade 4 of the high-speed rotary blade 3 tries to pass the same position next time, the receiving blade 2 2 is slightly moving in the direction of the receiving blade 2 1 as shown in (d), grass has been pushed down to is cut and raised to raise sequentially scooping, indicator lawn is slightly shorter cut be in an intermediate position of the receiving blades 2 1 and 2 2 as (e). Similarly, by the next movement of the cutting blade 4, the cutting is performed as shown in (f) and (g), and the index grass is cut into the shortest state. By moving the receiving blade 2 in the opposite direction to the cutting blade 4 at a low speed in this way, the grass on the lawn surface to be mowed is sequentially scooped and exposed to a plurality of cutting actions, and the shortest desired height is obtained. Will be severed.
【０００９】[0009]
【実施例】以下、本発明芝刈機の実施例を、添付の図面
に基づいて説明する。図１は、モーター駆動されるハン
ディタイプの芝刈機に応用した実施例を示すもので、後
方にハンドル６を突出させた本体フレーム５内に、モー
ターケース7aに固定されたモーター７を内蔵している。
本体フレーム５の出力軸８の先端には小歯車９が装着さ
れ、この小歯車９は隣接する大歯車10に噛合している。
大歯車10が回転自在に支持される軸11は固定軸であっ
て、軸11の先端にはネジ12によって底カバー13が固定さ
れている。Embodiments of the lawnmower of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment applied to a motor-driven handy type lawn mower, in which a motor 7 fixed to a motor case 7a is built into a main body frame 5 having a handle 6 protruding rearward. There is.
A small gear 9 is mounted on the tip of the output shaft 8 of the body frame 5, and the small gear 9 meshes with an adjacent large gear 10.
A shaft 11 on which the large gear 10 is rotatably supported is a fixed shaft, and a bottom cover 13 is fixed to the tip of the shaft 11 with a screw 12.
【００１０】大歯車10が軸支される軸11の同軸上には先
端部に切刃４が装着された高速回転刃３が軸支され、大
歯車10の回転力が高速回転刃３に伝えられる。図示実施
例においては、高速回転刃３は図３，図８から理解され
るように三方に突出するアームの先端に切刃４を装着し
たものとし、図１に示すように軸11に軸着した偏心ホル
ダー14に装着して軸11の中心O1を中心として回転する。
そして、大歯車10の回転力がトルク板15を介して高速回
転刃３に伝えられるようにしているため、過負荷防止の
機能を果たすようにしている。上記、偏心ホルダー14に
はその下半部に軸孔の中心O1に対して偏心させたO2を中
心とする断面円形の偏心ボス14a を突出させている。A high-speed rotary blade 3 having a cutting edge 4 mounted on its tip is coaxially supported on a shaft 11 on which the large gear 10 is axially supported, and the rotational force of the large gear 10 is transmitted to the high-speed rotary blade 3. To be In the illustrated embodiment, the high-speed rotary blade 3 has a cutting blade 4 attached to the tip of an arm protruding in three directions as understood from FIGS. 3 and 8, and is attached to a shaft 11 as shown in FIG. It is attached to the eccentric holder 14 and rotated about the center O 1 of the shaft 11.
Further, since the rotational force of the large gear 10 is transmitted to the high-speed rotary blade 3 via the torque plate 15, the function of preventing overload is fulfilled. Above, it is allowed to protrude a circular cross section of the eccentric boss 14a centered on O 2 that is decentered with respect to the center O 1 of the shaft hole in the lower half of the eccentric holder 14.
【００１１】底カバー13の中心部には、図１及び図５に
示すようにO1を中心とする中心軸16が立設されており、
これに受刃板１が回転可能に支持されている。受刃板１
は、図６に示すように外周部に多数の櫛歯状の受刃２，
２を等間隔に形成するものであって、その中心部には上
記底カバー13の中心軸16に嵌合する軸孔2aが穿設されて
いるとともに、同心上に外歯歯車17が一体的に固定して
ある。At the center of the bottom cover 13, as shown in FIGS. 1 and 5, a center shaft 16 centered on O 1 is erected.
The blade plate 1 is rotatably supported by this. Blade 1
As shown in FIG. 6, a large number of comb-shaped receiving blades 2,
2 are formed at equal intervals, and a shaft hole 2a that fits into the center shaft 16 of the bottom cover 13 is formed in the center thereof, and an external gear 17 is concentrically formed integrally therewith. It is fixed to.
【００１２】次に、受刃板１の回転駆動機構について説
明する。高速回転刃３を装着し、軸11を中心として回転
する偏心ホルダー14の偏心ボス14a には、軸受18を介し
て歯車ホルダー19を軸支している。歯車ホルダー19の外
周部には、前記外歯歯車17に噛合する内歯環状歯車20を
固定する（図７参照）とともに、下方に向けて複数の係
合突起21，21を突出させている。この複数の係合突起2
1，21は、底カバー13に形成したやや大きな径の係合孔2
2，22に係合させて自転を阻止させている。しかして、
偏心ホルダー14の偏心ボス14a は、回転中心O1に対して
中心O2が偏心しているため、内歯環状歯車20は、高速回
転刃３の回転にともなって、自転をせずに公転をするも
のである。なお、底カバー13に形成する係合孔22は、歯
車ホルダー19の係合突起21に係合して自転を阻止すると
同時に偏心による揺動（公転）を許容する大きさの孔と
するものである。Next, the rotary drive mechanism for the blade 1 will be described. A gear holder 19 is pivotally supported by a bearing 18 on an eccentric boss 14a of an eccentric holder 14 which is mounted with a high-speed rotary blade 3 and rotates about a shaft 11. An inner ring gear 20 that meshes with the outer gear 17 is fixed to the outer peripheral portion of the gear holder 19 (see FIG. 7), and a plurality of engaging protrusions 21, 21 are projected downward. This plurality of engaging projections 2
1 and 21 are engagement holes 2 formed in the bottom cover 13 and having a slightly larger diameter.
It is engaged with 2 and 22 to prevent rotation. Then
Since the center O 2 of the eccentric boss 14a of the eccentric holder 14 is eccentric with respect to the rotation center O 1 , the internal gear annular gear 20 revolves around the rotation of the high-speed rotary blade 3 without rotating. It is a thing. The engagement hole 22 formed in the bottom cover 13 is of a size that engages with the engagement protrusion 21 of the gear holder 19 to prevent rotation and at the same time allows swinging (revolution) due to eccentricity. is there.
【００１３】図４に示すように、内歯環状歯車20が自転
をしないで揺動回転（公転）を行うと、これに噛合して
いる外歯歯車17は、内歯環状歯車20の公転方向とは逆方
向に自転を行う。この回転数は、内歯環状歯車20の歯数
と外歯歯車17の歯数が僅少差であると大きな減速比で減
速され、外歯歯車17は内歯環状歯車20の公転数に比較し
て極めて低速の回転数で自転することになる。内歯環状
歯車20の歯数をZ1、外歯歯車17の歯数をZ2とすると外歯
歯車17の減速比は、Z2／Z1−Z2であり、例えばZ1を６
８、Z2を６６とすると減速比は３３となる。As shown in FIG. 4, when the internal gear 20 is rotated and revolves without rotating, the external gear 17 meshed with the internal gear 20 is rotated in the direction of revolution of the internal gear 20. Rotates in the opposite direction to. This rotation speed is reduced with a large reduction ratio when the number of teeth of the internal gear 20 and the number of teeth of the external gear 17 are small, and the external gear 17 is compared with the revolution number of the internal gear 20. It will rotate at extremely low speed. When the number of teeth of the internal gear 20 is Z 1 and the number of teeth of the external gear 17 is Z 2 , the reduction ratio of the external gear 17 is Z 2 / Z 1 −Z 2 , and for example, Z 1 is 6
8 and Z 2 is 66, the reduction ratio is 33.
【００１４】内歯環状歯車20には、偏心ホルダー14を介
して高速回転刃３の回転数が揺動する回転（公転）数と
して伝えられるとともに、外歯歯車17は受刃板１と一体
的に固定されているため、高速回転刃３の回転数が大き
く減速されて受刃板１を逆方向に低速で回転することに
なる。上記に例示した歯数によって減速比を３３とする
と、高速回転刃３の回転数が毎分１０００回転のとき受
刃板１は毎分略３０回転となる。図示実施例では、受刃
板１の外周部に２４の受刃２が形成されるとともに、高
速回転刃３には三方のアームの先端部に切刃４が装着さ
れている。したがって、受刃板が受刃２，２の１ピッチ
分を回転する間に、その表面を切刃４が略４回通過し、
その間にある芝を順次に掬い起こしながら一定の高さに
切断することになる。The rotational speed of the high-speed rotary blade 3 is transmitted to the internal gear 20 via the eccentric holder 14 as a rotational (revolution) speed, and the external gear 17 is integrated with the receiving plate 1. Since the rotation speed of the high-speed rotary blade 3 is greatly reduced, the blade plate 1 is rotated in the opposite direction at a low speed. Assuming that the reduction ratio is 33 based on the number of teeth illustrated above, when the rotation speed of the high-speed rotary blade 3 is 1000 rotations per minute, the blade plate 1 is about 30 rotations per minute. In the illustrated embodiment, 24 receiving blades 2 are formed on the outer peripheral portion of the receiving blade plate 1, and the high-speed rotary blade 3 is provided with cutting blades 4 at the tips of three-way arms. Therefore, while the receiving blade plate rotates one pitch of the receiving blades 2 and 2, the cutting blade 4 passes the surface thereof approximately four times,
In the meantime, the turf in between will be scooped up and cut into pieces at a certain height.
【００１５】なお、高速回転刃３と受刃板１の減速比
は、任意に設定することができるが、少なくとも受刃
２，２の１ピッチ分を回転する間に高速回転刃の切刃４
が複数回通過する程度とし、通常１０〜数１０分の１程
度とする。このことは、底面に露出する受刃板２が作業
者に対し危険性のない、低速回転であることを意味す
る。１０〜数１０分の１という大きな減速比を得るに
は、各種歯車の組合せによって実現することもできる。
その場合、大きな歯車を使用したり構造が複雑な歯車列
を採用することになり、軽量でコンパクトな減速装置と
することができない。これに対し、先に説明した内歯環
状歯車20と外歯歯車17の組合せによれば非常に簡略化し
て軽量のハンディタイプの芝刈機に応用することができ
る。The reduction ratio between the high-speed rotary blade 3 and the receiving blade 1 can be set arbitrarily, but the cutting blade 4 of the high-speed rotary blade 4 is rotated at least during one pitch of the receiving blades 2 and 2.
Is passed a plurality of times, and is usually about 10 to several tenths. This means that the blade plate 2 exposed on the bottom surface is a low-speed rotation that is not dangerous to the operator. In order to obtain a large reduction ratio of 10 to several tens, it can be realized by combining various gears.
In that case, a large gear is used or a gear train having a complicated structure is adopted, so that it is not possible to provide a lightweight and compact speed reducer. On the other hand, the combination of the internally toothed annular gear 20 and the externally toothed gear 17 described above can be applied to a handy type lawnmower that is very simple and lightweight.
【００１６】図２に示す実施例は、図１に示す実施例の
芝刈機において、高速回転刃３の上方に安全のためのカ
バー23を設けたものである。このカバー23は、本体フレ
ーム５に装着するものであって、作業の進行方向に相当
する前半部はその外周部分に手指が入りにくい間隔の櫛
歯23a,23a を形成し、ハンドル６側に相当する後半部は
平板部23b としている。カバー23は、その後半部におい
て一定寸法のスペーサー24で底カバー13に固定してい
る。このスペーサーにより、カバー23は高速回転刃３と
の間に所定間隔を保持し、かつ十分な強度が得られる。The embodiment shown in FIG. 2 is the lawn mower of the embodiment shown in FIG. 1 in which a cover 23 for safety is provided above the high-speed rotary blade 3. The cover 23 is mounted on the main body frame 5, and the front half portion corresponding to the traveling direction of the work has comb teeth 23a, 23a formed at the outer peripheral portion thereof at intervals where it is difficult for fingers to enter, and corresponds to the handle 6 side. The latter half is a flat plate portion 23b. The cover 23 is fixed to the bottom cover 13 by a spacer 24 having a constant size in the latter half thereof. With this spacer, the cover 23 maintains a predetermined space between the cover 23 and the high-speed rotary blade 3, and sufficient strength is obtained.
【００１７】カバー23を設けることにより、常時手が触
れる可能性がある後半部のより一層の安全を確保すると
ともに、刈り取った芝の排出や目視しながら作業を進め
る上において支障を生じないものとしている。実施例の
芝刈機においては、モーター７の出力軸８に冷却用のフ
ァン25を装着し、モーターに風を吸い込むようにすると
ともに、図中矢印で示すようにファン25から吹き出され
た風を高速回転刃３の上から吹き付け、刈り取った芝を
機外に吹き飛ばすことにより機内における芝の付着を減
少させ、切削能力の低下を防止し、かつ使用後の掃除が
容易に行えるようにしている。この際、カバー23の前半
部を櫛歯状としていることによって、風の流通や芝の排
出が容易に行われることになる。By providing the cover 23, the safety of the latter half, which may be touched by the hand at all times, is ensured and at the same time, there is no problem in discharging the cut grass and advancing the work while visually observing. There is. In the lawnmower of the embodiment, a cooling fan 25 is attached to the output shaft 8 of the motor 7 so as to suck the air into the motor, and the air blown out from the fan 25 is discharged at high speed as indicated by the arrow in the figure. By blowing the grass cut off and blown off from the rotary blade 3 to the outside of the machine, the adhesion of the grass inside the machine is reduced, the cutting ability is prevented from lowering, and the cleaning after use is facilitated. At this time, since the front half of the cover 23 has a comb-teeth shape, the flow of air and the discharge of grass are facilitated.
【００１８】[0018]
【発明の効果】請求項１記載の本発明芝刈機によれば、
芝生面に対向する受刃の上表面を高速回転刃の切刃が摺
動する方式の優れた切れ味を発揮するものであって、受
刃板が低速度で高速回転刃とは逆方向に回転するため、
移動する受刃が受刃自身によって一時的に押しつける芝
を含め順次に掬い起こすように作用し、かつ個々の芝に
対する切断の位置関係が変化しながら芝を刈り取ること
になる。したがって、一度の作業で芝の刈り残しがな
く、一定の高さに見栄え良く刈ることができる効果があ
る。一般に受刃と受刃の間隔が大きい方が、芝の導入が
容易で能率的に作業を進めることができるものである
が、一方で受刃と受刃の間隔が大きいほど刈り高さのば
らつきを生じる欠点があったが、本発明では受刃と受刃
の間隔をなるべく大きくし、芝刈り性能に優れたものと
しながら一度の作業できれいに刈り揃えることができ
る。According to the lawnmower of the present invention described in claim 1,
The cutting blade of the high-speed rotating blade slides on the upper surface of the receiving blade facing the lawn surface, which provides excellent sharpness, and the receiving blade rotates at a low speed in the opposite direction to the high-speed rotating blade. In order to
The moving blade acts to scoop up the grass one by one including the grass which is temporarily pressed by the blade itself, and the grass is cut while the positional relationship of cutting with respect to each grass changes. Therefore, there is no uncut portion of the grass in a single operation, and there is an effect that it is possible to effectively cut grass at a constant height. Generally, the larger the distance between the cutting blades and the cutting blades, the easier the introduction of turf and the more efficient the work can be done. However, the larger the distance between the cutting blades and the variation in cutting height. However, in the present invention, the distance between the receiving blade and the receiving blade can be made as large as possible, and the lawn mowing performance can be excellent and the cutting can be performed neatly in one operation.
【００１９】請求項２記載の発明によれば、受刃板を高
速回転刃とは逆方向に低速度で回転させる回転機構を、
なるべく部品点数の少ない簡潔な構造で構成することが
できる。したがって、前記特長を備えた芝刈機を安価に
提供することができるとともに、軽量のものとしてハン
ディタイプの芝刈機に応用することができる。According to the second aspect of the present invention, there is provided a rotating mechanism for rotating the receiving blade plate at a low speed in a direction opposite to that of the high speed rotary blade.
It can be configured with a simple structure having as few parts as possible. Therefore, it is possible to provide a lawnmower having the above-mentioned features at a low cost and to apply it to a handy type lawnmower as a lightweight one.
【００２０】請求項３記載の発明によれば、高速回転刃
の上方をカバーで覆うため作業者の安全を確保すること
ができるとともに、このカバーは、前半部の櫛歯状と後
半部の平板状の組合せによってよって、優れた作業性と
より確実な安全性とを兼ね備えたものとなる。下表面に
大きく露出する受刃板は、低速回転であるため危険性は
少なく、危険性のある高速回転刃には手指が触れないよ
うにすることができるものである。According to the third aspect of the present invention, since the upper part of the high-speed rotary blade is covered with the cover, the safety of the operator can be ensured, and the cover has a comb tooth shape in the front half and a flat plate in the rear half. Depending on the combination of the shapes, it is possible to have both excellent workability and more reliable safety. The blade plate that is largely exposed on the lower surface is low in speed because it rotates at a low speed, and it is possible to prevent the dangerous high speed rotary blade from being touched by fingers.
【図１】ハンディタイプの芝刈機に応用した実施例を示
す、全体の縦断面図、FIG. 1 is an overall vertical cross-sectional view showing an embodiment applied to a handy type lawn mower,
【図２】ハンディタイプの芝刈機であって、安全のため
のカバーを装着する実施例を示す、全体の縦断面図、FIG. 2 is an overall vertical cross-sectional view showing a handy type lawnmower in which a cover for safety is attached,
【図３】受刃板と高速回転刃との関係を示す平面図、FIG. 3 is a plan view showing a relationship between a blade plate and a high-speed rotary blade,
【図４】減速機構としての内歯環状歯車と外歯歯車の関
係を示す平面図、FIG. 4 is a plan view showing a relationship between an internal gear and an external gear serving as a reduction mechanism,
【図５】底カバーのみの平面図、FIG. 5 is a plan view of only the bottom cover,
【図６】外歯歯車を含む受刃板の平面図、FIG. 6 is a plan view of a blade plate including an external gear,
【図７】内歯環状歯車を装着した歯車ホルダーの底面
図、FIG. 7 is a bottom view of a gear holder equipped with an internally toothed annular gear,
【図８】偏心ホルダーを含む高速回転刃の底面図、FIG. 8 is a bottom view of a high-speed rotary blade including an eccentric holder,
【図９】芝が切断される過程を順を追って示す説明図、FIG. 9 is an explanatory diagram showing, in sequence, the process of cutting grass.
【図１０】安全のためのカバーのみの平面図、FIG. 10 is a plan view of only a cover for safety,
【図１１】従来の芝刈機において、芝が切断される過程
を順を追って示す説明図。FIG. 11 is an explanatory view sequentially showing a process of cutting grass in a conventional lawn mower.
１…受刃板、 ２…受刃、 ３…高速回転刃、 ４…切
刃、 ５…本体フレーム、 ６…ハンドル、 ７…モー
ター、 ８…出力軸、 ９…小歯車、 10…大歯車、
11…軸、 12…ネジ、 13…底カバー、 14…偏心ホル
ダー、 14a …偏心ボス、 15…トルク板、 16…中心
軸、 17…外歯歯車、 18…軸受、 19…歯車ホルダ
ー、 20…内歯環状歯車、 21…係合突起、 22…係合
孔、 23…カバー、 24…スペーサー、 25…ファン。1 ... Receiving blade, 2 ... Receiving blade, 3 ... High-speed rotating blade, 4 ... Cutting blade, 5 ... Main body frame, 6 ... Handle, 7 ... Motor, 8 ... Output shaft, 9 ... Small gear, 10 ... Large gear,
11 ... Shaft, 12 ... Screw, 13 ... Bottom cover, 14 ... Eccentric holder, 14a ... Eccentric boss, 15 ... Torque plate, 16 ... Central shaft, 17 ... External gear, 18 ... Bearing, 19 ... Gear holder, 20 ... Internal toothed ring gear, 21 ... Engaging protrusion, 22 ... Engaging hole, 23 ... Cover, 24 ... Spacer, 25 ... Fan.
Claims (3)
１と、先端部に切刃４を設けた高速回転刃３とで構成
し、高速回転刃３に設けた切刃４が受刃板の表面に摺接
し受刃２との間で芝の切断を行う芝刈機において、受刃
板１を高速回転刃３の回転方向とは逆方向に低速で回転
させるようにしたことを特徴とする芝刈機。1. A cutting blade provided on a high-speed rotary blade 3 comprising a blade plate 1 having a comb-shaped receiving blade 2 formed on an outer peripheral portion thereof, and a high-speed rotary blade 3 having a cutting blade 4 at a tip thereof. In the lawn mower in which the blade 4 slides on the surface of the receiving blade to cut the grass between the blade 2 and the blade 2, the blade 1 is rotated at a low speed in the direction opposite to the rotation direction of the high-speed rotary blade 3. A lawn mower characterized by what it has done.
１と、先端部に切刃４を設けた高速回転刃３とで構成
し、高速回転刃３に設けた切刃４が受刃板の表面に摺接
し受刃２との間で芝の切断を行う芝刈機において、高速
回転刃３の回転を内歯環状歯車20の自転しない公転とし
て作用させ、該内歯環状歯車20にその歯数と僅少差の歯
数である外歯歯車17を噛合させ、該外歯歯車17の自転を
受刃板１の回転として出力させることにより、受刃板２
を高速回転刃３の回転方向とは逆方向に低速で回転させ
るようにしたことを特徴とする芝刈機。2. A cutting blade provided on a high-speed rotary blade 3 which comprises a blade plate 1 having a comb-shaped receiving blade 2 formed on an outer peripheral portion thereof and a high-speed rotary blade 3 having a cutting blade 4 at a tip portion thereof. In a lawn mower in which a blade 4 is in sliding contact with the surface of a blade plate and cuts grass between the blade and the blade 2, the rotation of the high-speed rotary blade 3 acts as a revolution of the internal gear annular gear 20 that does not rotate, By engaging the external gear 17 having a small number of teeth with the annular gear 20 and causing the rotation of the external gear 17 to be output as the rotation of the receiving plate 1, the receiving plate 2
The lawn mower is characterized in that the blade is rotated at a low speed in a direction opposite to the rotating direction of the high-speed rotary blade 3.
に相当する前半部の外周部分を手指が入らない間隔の櫛
歯状、後半部を高速回転刃３の上方を完全に覆う平板状
としたカバー23を装着してなる請求項１記載の芝刈機。3. Above the high-speed rotary blade 3, the outer peripheral portion of the front half portion corresponding to the traveling direction of the work is comb-shaped so that fingers cannot be inserted, and the rear half portion completely covers the upper portion of the high-speed rotary blade 3. The lawn mower according to claim 1, which is provided with a flat cover 23.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24054094A JPH0870668A (en) | 1994-09-07 | 1994-09-07 | Lawn mower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24054094A JPH0870668A (en) | 1994-09-07 | 1994-09-07 | Lawn mower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0870668A true JPH0870668A (en) | 1996-03-19 |
Family
ID=17061058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24054094A Pending JPH0870668A (en) | 1994-09-07 | 1994-09-07 | Lawn mower |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0870668A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007325508A (en) * | 2006-06-06 | 2007-12-20 | Ryobi Ltd | Rotary lawn mower |
| CN109041862A (en) * | 2018-10-24 | 2018-12-21 | 河北农业大学 | Shifting fork type walnut seedling stubble leveling machine |
| JP2020156424A (en) * | 2019-03-27 | 2020-10-01 | 株式会社マキタ | Implement |
-
1994
- 1994-09-07 JP JP24054094A patent/JPH0870668A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007325508A (en) * | 2006-06-06 | 2007-12-20 | Ryobi Ltd | Rotary lawn mower |
| CN109041862A (en) * | 2018-10-24 | 2018-12-21 | 河北农业大学 | Shifting fork type walnut seedling stubble leveling machine |
| JP2020156424A (en) * | 2019-03-27 | 2020-10-01 | 株式会社マキタ | Implement |
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