JPH07115823A - Mower - Google Patents

Abstract

PURPOSE:To provide a mower having excellent operation safety and operation efficiency, capable of revolving the rotary knives at a low speed, by fixing each of plural superimposed rotary knives to a revolving shaft and a revolving cylinder, installing a rocking device for reciprocatively rotating the rotary knives in the mutually opposite directions. CONSTITUTION:This mower is equipped with a first rocking device 121 which holds a revolving shaft 93 for fixing a first rotary knife 45 to its end and a revolving cylinder 111 fixing a second rotary knife 43 slidably superimposed on the first rotary knife 45 to its end, being rotatably engaged with the outer periphery of the revolving shaft 93 in a transmission case 47 and reciprocatively rotating the first rotary knife 45 from a cam shaft 75 put side by side in the parallel direction with the revolving shaft 93 through the revolving shaft 93 and with a second rocking case 123 which reciprocatively revolves the second rotary knife 43 from the cam shaft 75 through the revolving cylinder 111 in the opposite direction to the first rotary knife 45 in the transmission case 47.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、エンジン等の原動機に
よって駆動する回転刃により地上の草等を刈り払う等の
草刈り作業を行うための草刈装置に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mowing device for performing mowing work such as mowing grass on the ground by a rotary blade driven by a prime mover such as an engine.

【０００２】[0002]

【従来の技術】従来の草刈装置は、たとえば刈払機のよ
うに、回転刃を軸支する軸受体と、エンジンとを連結杆
によって連結し、作業者はこの連結杆に設けた握り部を
両手で把持して、回転する回転刃によって地上の草等を
刈り払う草刈り作業を行っていた。すなわち、図４、図
５において、外周に鋸状の刃部１を備えた円板状の回転
刃３は軸受ケース５に軸支され、連結杆７を介して軸受
ケース５と連結するエンジン９の駆動により、連結杆７
を貫通する伝動軸１１を介して回転駆動される。連結杆
７の途中には、握り部１３とハンドル１５が設けられ、
ハンドル１５には握り部１７が固着している。軸受ケー
ス５内にはベアリング１９を介して回転軸２１が垂直方
向に軸支され、回転軸２１の上端に固着するベベルギヤ
ー２３は、伝動軸１１の先端に係合してベアリング２５
によって軸受ケース５に軸支されたベベルギヤー２７と
噛み合っている。回転軸２１の下端は外周のスプライン
２９に係合する上下のワッシャー３１，３３によって、
外周に鋸刃状刃部１を備えた円板状の回転刃３が挟持さ
れ下端のナット３５によって固定されている。2. Description of the Related Art In a conventional mowing device, for example, like a brush cutter, a bearing body for axially supporting a rotary blade and an engine are connected by a connecting rod, and an operator holds a grip portion provided on the connecting rod with both hands. The grass was mowed with the rotating rotary blade. That is, in FIG. 4 and FIG. 5, the disk-shaped rotary blade 3 having the saw-shaped blade portion 1 on the outer periphery is axially supported by the bearing case 5, and is connected to the bearing case 5 via the connecting rod 7. Driven by the connecting rod 7
It is rotationally driven via a transmission shaft 11 passing through. A grip 13 and a handle 15 are provided in the middle of the connecting rod 7.
A grip 17 is fixed to the handle 15. A rotating shaft 21 is vertically supported in the bearing case 5 via a bearing 19, and a bevel gear 23 fixed to an upper end of the rotating shaft 21 is engaged with a tip of the transmission shaft 11 to form a bearing 25.
Is engaged with the bevel gear 27 that is axially supported by the bearing case 5. The lower end of the rotary shaft 21 is fitted with upper and lower washers 31 and 33 which engage with the splines 29 on the outer circumference.
A disk-shaped rotary blade 3 having a saw blade-shaped blade portion 1 on the outer periphery is sandwiched and fixed by a nut 35 at the lower end.

【０００３】作業者は、握り部１３，１７を両手で把持
してエンジン９の駆動で高速に回転する回転刃３によっ
て地上の草等を刈り払う草刈り作業を行なうものであ
る。An operator carries out a mowing operation in which the grips 13 and 17 are held by both hands and the rotary blade 3 which is rotated at high speed by driving the engine 9 cuts off grass and the like on the ground.

【０００４】[0004]

【発明が解決しようとする課題】この場合、回転刃３は
高速で回転するので、小石等を跳ねとばして危険であ
り、またやわらかい草を刈るときは、遠心風によって吹
き倒されて刈ることができず、刈り残しの原因となって
いた。とくに、従来の回転刃は外周に鋸状の先端が鋭利
の刃部が形成され、高速で回転するため、植木等の幹に
触れると大きな傷を生じ、万一他人の脚に触れると大事
故となる危険があった。In this case, since the rotary blade 3 rotates at a high speed, it is dangerous to bounce off small stones or the like, and when cutting soft grass, it may be blown down by the centrifugal wind and mowed. I could not do it, and it was a cause of uncut. In particular, conventional rotary blades have sharp blades with a serrated tip on the outer periphery and rotate at high speed, causing serious damage when touching the trunk of a plant or the like and causing a serious accident if it touches another person's leg. There was a risk of becoming.

【０００５】この危険をなくすためには、回転速度を低
速にすればよいが、このためには、つぎのような問題が
あって実施されていなかった。In order to eliminate this danger, the rotation speed may be reduced, but this has not been implemented because of the following problems.

【０００６】(1) 速度を遅くすると１枚の回転刃では切
断できず、２枚の回転刃を重ね合わせて鋏のように切断
する必要がある。(1) When the speed is slowed down, it is impossible to cut with one rotary blade, and it is necessary to stack two rotary blades and cut them like scissors.

【０００７】(2) ２枚の回転刃の一方を固定すると、固
定刃の先端が小枝等につきあたって、回転刃全体を押し
進めることができず、小枝が刃の間に進入しないので切
断できない。(2) When one of the two rotary blades is fixed, the tip of the fixed blade hits a twig or the like, and the entire rotary blade cannot be pushed forward, and the twig does not enter between the blades, so cutting cannot be performed.

【０００８】(3) ２枚の回転刃を互いに反対方向にそれ
ぞれ回転させれば刃先が小枝につきあたることがなく、
したがって回転刃の押し進めが阻害されることはなくな
るが、遅い速度で回転刃が回転するので遠心力が小さく
なって回転刃に草が巻き付き、除去が厄介となる。(3) If the two rotary blades are rotated in mutually opposite directions, the blade tip will not hit the twigs,
Therefore, the pushing of the rotary blade is not obstructed, but the rotary blade rotates at a slow speed, the centrifugal force is reduced, and the grass is wrapped around the rotary blade, which makes removal difficult.

【０００９】[0009]

【課題を解決するための手段】本発明は、重ね合わせた
２枚の回転刃を、それぞれ回転軸と、回転軸の外周に嵌
合する回転筒とに固着して設け、回転軸に平行のカム軸
から回転軸または回転筒を介してそれぞれの回転刃を互
いに反対方向に往復回動せしめる揺動装置を設けたもの
である。SUMMARY OF THE INVENTION According to the present invention, two rotary blades, which are superposed on each other, are fixed to a rotary shaft and a rotary cylinder fitted to the outer periphery of the rotary shaft, respectively, and are parallel to the rotary shaft. An oscillating device for reciprocally rotating the rotary blades in opposite directions from the cam shaft via the rotary shaft or the rotary cylinder is provided.

【００１０】[0010]

【作用】反対方向にそれぞれ往復回動する２枚の回転刃
によって草等を鋏み切るが、回転速度を遅くして作業の
安全性を向上し、しかも草の巻き込みを防止することが
可能となり、また、揺動装置を伝動ケース内に収容し、
しかも回転軸と回転筒の軸封が容易で確実なため、伝動
ケース内の揺動装置に草片、塵埃が付着することがな
い。[Function] Although two grass blades are reciprocally rotated in opposite directions to scissor grass and the like, the rotation speed can be reduced to improve work safety and prevent grass from being caught. Also, the rocking device is housed in the transmission case,
Moreover, since the rotary shaft and the rotary cylinder are easily and reliably sealed, grass pieces and dust do not adhere to the rocking device in the transmission case.

【００１１】[0011]

【実施例】以下、図面により本発明の一実施例について
詳細な説明を行なう。すなわち、図１〜図３において、
外周にそれぞれ刃部４１，４２を備えた円板状の上，下
２枚の第２回転刃４３，第１回転刃４５が伝動ケース４
７に重ね合わせて軸支され、連結杆４９を介して伝動ケ
ース４７と連結するエンジン５１の駆動により、連結杆
４９を貫通する伝動軸５３を介して互いに反対方向にそ
れぞれ往復回動自在に設けられている。連結杆４９の途
中には、握り部５５とハンドル５７が設けられ、ハンド
ル５７には握り部５９が固着している。伝動ケース４７
には連結杆４９の一端が傾斜して固着され、連結杆４９
の内部を貫通する伝動軸５３の先端の角軸６１は、ベア
リング６３を介して伝動ケース４７に軸支されたベベル
ギヤー６５に係合している。伝動ケース４７には垂直方
向に中間軸６７がベアリング６９，６９を介して軸支さ
れている。中間軸６７の上部には、ベベルギヤー６５に
係合するベベルギヤー７１が固着している。中間軸６７
の下部には小ギヤー７３が固着している。伝動ケース４
７には垂直方向のカム軸７５がベアリング７７，７７に
よって軸支され、カム軸７５には、小ギヤー７３に噛み
合う大ギヤー７９と、２個の円形のカム板８１，８３が
軸受環８５を介して固着されている。２個のカム板８
１，８３はそれぞれ大ギヤー７９の上方、下方位置にカ
ム軸７５の中心に対して対称位置に偏心して並設され、
外周にそれぞれ軸受環８５，８７を介して連結杆８９，
９１の一端が嵌合している。また伝動ケース４７には垂
直方向の回転軸９３がベアリング９５，９７を介して軸
支され、回転軸９３の上端には、連結杆８９の他端とピ
ン９９によって枢着するアーム１０１が一体に固着し、
下端に形成した角軸１０３に係合する支持板１０５がナ
ット１０７によって固定されている。支持板１０５には
下方の第１回転刃４５がボルト１０９によって固着され
ている。回転軸９３の外周には回転筒１１１が回転自在
に嵌合し、回転筒１１１に一体に固着するアーム１１３
の他端はピン１１５によって連結杆９１の他端が枢着し
ている。回転筒１１１の下端に一体に固着する支持板１
１７には、第１回転刃４５に重ね合わせた第２回転刃４
３がボルト１１９によって固着されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. That is, in FIGS.
The disk-shaped upper and lower two second rotary blades 43 and the first rotary blade 45 having the blade portions 41 and 42 respectively on the outer periphery are the transmission case 4
By the drive of an engine 51 which is axially supported by being superposed on 7, and which is connected to a transmission case 47 via a connecting rod 49, it is reciprocally rotatable in opposite directions via a transmission shaft 53 penetrating the connecting rod 49. Has been. A grip 55 and a handle 57 are provided in the middle of the connecting rod 49, and a grip 59 is fixed to the handle 57. Transmission case 47
One end of the connecting rod 49 is inclined and fixed to the connecting rod 49.
An angular shaft 61 at the tip of the transmission shaft 53 penetrating the inside of the shaft is engaged with a bevel gear 65 pivotally supported by the transmission case 47 via a bearing 63. An intermediate shaft 67 is vertically supported by the transmission case 47 via bearings 69, 69. A bevel gear 71 that engages with the bevel gear 65 is fixed to the upper portion of the intermediate shaft 67. Intermediate shaft 67
A small gear 73 is fixed to the lower part of the. Transmission case 4
7, a vertical cam shaft 75 is supported by bearings 77, 77, and a large gear 79 meshing with a small gear 73 and two circular cam plates 81, 83 have a bearing ring 85 on the cam shaft 75. Fixed through. 2 cam plates 8
Numerals 1 and 83 are provided above and below the large gear 79, respectively, so as to be eccentrically arranged in symmetry with respect to the center of the cam shaft 75.
Connecting rods 89, 87 are provided on the outer periphery through bearing rings 85, 87, respectively.
One end of 91 is fitted. A vertical rotating shaft 93 is rotatably supported by the transmission case 47 via bearings 95 and 97, and an upper end of the rotating shaft 93 is integrally provided with the other end of the connecting rod 89 and an arm 101 pivotally attached by a pin 99. Stuck,
A support plate 105 that engages with the square shaft 103 formed at the lower end is fixed by a nut 107. The lower first rotary blade 45 is fixed to the support plate 105 with a bolt 109. An arm 113 that rotatably fits around the outer circumference of the rotary shaft 93 and that is integrally fixed to the rotary cylinder 111.
The other end of is connected to the other end of the connecting rod 91 by a pin 115. Support plate 1 integrally fixed to the lower end of the rotary cylinder 111
17 includes a second rotary blade 4 superposed on the first rotary blade 45.
3 is fixed by bolts 119.

【００１２】第１揺動装置１２１は、カム板８１、連結
杆８９、アーム１０１よりなり、カム軸７５から回転軸
９３を介して、第１回転刃４５を往復回動する。第２揺
動装置１２３はカム板８３、連結杆９１、アーム１１３
よりなり、カム軸７５から回転筒１１１を介して第２回
転刃４３を、第１回転刃４５と反対方向に往復回動す
る。The first swinging device 121 comprises a cam plate 81, a connecting rod 89 and an arm 101, and reciprocally rotates the first rotary blade 45 from the cam shaft 75 via the rotary shaft 93. The second swinging device 123 includes a cam plate 83, a connecting rod 91, an arm 113.
Therefore, the second rotary blade 43 is reciprocally rotated from the cam shaft 75 via the rotary cylinder 111 in the opposite direction to the first rotary blade 45.

【００１３】以上の実施例において、エンジン５１を回
転すると、動力は伝動軸５３からベベルギヤー６５、７
１を経て中間軸６７に伝達され、小ギヤー７３，大ギヤ
ー７９を経てカム軸７５を回転させる。カム軸７５の回
転にともなって、２個のカム板８１，８３が互いに対称
位置を保持しつつ回転するので、連結杆８９，９１を介
してアーム１０１，１１３を互いに反対方向に揺動させ
る。したがってアーム１０１，１１３と一体的に固着す
る回転刃４３，４５は相対的に往復回動運動を行い、刃
部４１，４２の間で草等を切断するものである。作業者
は握り部５５，５９を両手で把持し、往復回動する回転
刃４３，４５によって草等を切断するものである。In the above embodiment, when the engine 51 is rotated, power is transmitted from the transmission shaft 53 to the bevel gears 65 and 7.
It is transmitted to the intermediate shaft 67 via 1 and rotates the cam shaft 75 via the small gear 73 and the large gear 79. With the rotation of the cam shaft 75, the two cam plates 81 and 83 rotate while maintaining symmetrical positions with each other, so that the arms 101 and 113 are swung in opposite directions via the connecting rods 89 and 91. Therefore, the rotary blades 43 and 45 integrally fixed to the arms 101 and 113 relatively reciprocally rotate to cut grass or the like between the blade portions 41 and 42. An operator holds the grips 55 and 59 with both hands and cuts grass or the like with the rotary blades 43 and 45 that reciprocally rotate.

【００１４】[0014]

【発明の効果】本発明は請求の範囲に記載のとおりの構
成であるから、つぎのような効果を有するものである。
(1) 回転刃の低速回転が可能となり、小石等をはねとば
す危険がなく、植木、他人の脚に接触しても大事に至ら
ない。(2) ２枚の回転刃の間で切断するので、切れ味が
よく、やわらかい草でも切断でき、刈り残しを生じな
い。(3) しかも、刃部が円盤状に並んでいるので、どの
方向でも切断でき、刈払機のように左右に振って往復草
刈りができ、能率的である。また複雑な形状の刈り込み
ができる。(4) 揺動装置を伝動ケース内に収容し、しか
も回転軸、回転筒の軸封が容易で確実なため、伝動ケー
ス内の揺動装置に草片、塵埃が付着して作動を妨げるこ
とがない。The present invention has the following effects because it has the structure as described in the claims.
(1) Since the rotary blade can rotate at low speed, there is no danger of splashing pebbles, etc. It is not important even if it comes into contact with a plant or the leg of another person. (2) Since it is cut between two rotary blades, it has good sharpness and can cut soft grass without leaving uncut residue. (3) Moreover, since the blades are arranged in a disk shape, it can be cut in any direction, and can be reciprocally mowed by shaking to the left and right like a brush cutter, which is efficient. In addition, it is possible to trim complicated shapes. (4) Since the rocking device is housed in the transmission case, and the rotary shaft and rotary cylinder are easily and reliably sealed, grass pieces and dust may adhere to the rocking device in the transmission case to prevent operation. There is no.

【００１５】なお、本発明は、前述の実施例では、伝動
ケースは連結杆を介してエンジンに連結しているが、連
結杆を廃して、伝動ケースとエンジン等の原動機とを直
接一体的に接続し、コンパクトに形成して庭木等の刈り
込みに用いてもよい。According to the present invention, the transmission case is connected to the engine through the connecting rod in the above-described embodiment, but the connecting rod is eliminated and the transmitting case and the prime mover such as the engine are directly integrated. You may connect and form compactly, and may be used for trimming garden trees.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例の斜視説明図。FIG. 1 is an explanatory perspective view of an embodiment of the present invention.

【図２】要部の平断面図。FIG. 2 is a plan sectional view of a main part.

【図３】図２のIII −III 線の展開側断面図。FIG. 3 is a developed side sectional view taken along line III-III in FIG.

【図４】従来例の斜視説明図。FIG. 4 is a perspective explanatory view of a conventional example.

【図５】同要部の側断面図。FIG. 5 is a side sectional view of the main part.

【符号の説明】[Explanation of symbols]

４３ 第１回転刃 ４５ 第２回転刃 ４７ 伝動ケース ７５ カム軸 ９３ 回転軸 １１１ 回転筒 １２１ 第１揺動装置 １２３ 第２揺動装置 43 1st rotary blade 45 2nd rotary blade 47 Transmission case 75 Cam shaft 93 Rotating shaft 111 Rotating cylinder 121 First rocking device 123 Second rocking device

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 第１回転刃４５を端部に固着する回転軸
９３と、前記第１回転刃４５に摺動自在に重ね合せた第
２回転刃４３を端部に固着し、前記回転軸９３の外周に
回動自在に嵌合する回転筒１１１とを伝動ケース４７に
軸支し、前記回転軸９３と平行方向に並設したカム軸７
５から前記回転軸９３を介して前記第１回転刃４５を往
復回動せしめる第１揺動装置１２１と、前記カム軸７５
から前記回転筒１１１を介して前記第２回転刃４３を前
記第１回転刃４５と反対方向に往復回動せしめる第２揺
動装置１２３とを前記伝動ケース４７内に設けたことを
特徴とする草刈装置。1. A rotary shaft 93 for fixing a first rotary blade 45 to an end thereof, and a second rotary blade 43 slidably superposed on the first rotary blade 45 for fixed to an end thereof. A cam barrel 7 rotatably fitted to the outer periphery of 93 is pivotally supported on the transmission case 47, and is arranged in parallel with the rotary shaft 93.
5, a first swinging device 121 for reciprocally rotating the first rotary blade 45 via the rotary shaft 93, and the cam shaft 75.
A second swinging device 123 for reciprocally rotating the second rotary blade 43 in the opposite direction to the first rotary blade 45 via the rotary cylinder 111 is provided in the transmission case 47. Mowing equipment.