JP4374821B2

JP4374821B2 - Trimming device

Info

Publication number: JP4374821B2
Application number: JP2002048860A
Authority: JP
Inventors: 英澄岡村; 雅道中村
Original assignee: Panasonic Corp; Matsushita Electric Works Ltd
Current assignee: Panasonic Corp; Panasonic Electric Works Co Ltd
Priority date: 2002-02-25
Filing date: 2002-02-25
Publication date: 2009-12-02
Anticipated expiration: 2022-02-25
Also published as: JP2003250342A

Description

【０００１】
【発明の属する技術分野】
本発明は、庭木などの樹木の剪定や草刈に用いられる刈込み装置に関するものである。
【０００２】
【従来の技術】
従来、図７に示すように、刈込み装置として、基部を本体に固定して対向配置した上下一対の保持板１ａ，１ｂと、櫛状の刃部を有し、両保持板１ａ，１ｂ間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃２ａ，２ｂと、両切刃２ａ，２ｂ間に介装されて上下の切刃２の基部が接触しないよう遮蔽する中間材３とを備えたものが提案されている。中間材３としては、例えば樹脂材などの切刃２よりも柔らかい材質のものから、プレート状に形成されて後端部が下側の保持板１ｂの後端部に固定されたものが用いられる。中間材３表面と上下の切刃２ａ，２ｂ表面との間には隙間が形成されており、切刃２の往復運動時に切刃２と中間材３とが常に接触した状態で動くことがないようにしている。また、切刃２が往復運動時に上下方向に動いて中間材３に接触するようなことがあっても、中間材３が切刃２よりも柔らかいので、切刃２の磨耗や欠けを防止している。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来の刈込み装置では、切刃や中間材の部品精度や組み立て精度のバラツキによっては、切刃と中間材とが面接触して摺動抵抗が大きくなることによって、磨耗や運動負荷の増大が起こったり、切刃の上下移動が大きくなって上下の切刃が接触したり、切刃がその保持機構から外れたりすることがある。
【０００４】
本発明は、上記事由に鑑みてなされたものであり、その目的は、切刃や中間材の部品精度や組み立て精度のバラツキなどがあっても、切刃と中間材との面接触による磨耗や運動負荷の増大を防止できるとともに、切刃の上下移動による上下の切刃の接触や保持機構からの外れなどを防止できる刈込み装置を提供することにある。
【０００５】
【課題を解決するための手段】
請求項１記載の発明は、基部を本体に固定して対向配置した上下一対の保持板と、櫛状の刃部を有し、両保持板間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃と、両切刃間に隙間を設けて介装されて上下の切刃の基部が接触しないよう遮蔽する平板状の中間材と、を備えた刈込み装置において、中間材に可動切刃表面と点接触する点接触部を設けてなることを特徴として構成している。
【０００６】
このような刈込み装置では、中間材に可動切刃表面と点接触する点接触部を設けているので、中間材の点接触部が可動切刃表面と点接触した状態で往復運動し、切刃の摺動抵抗が小さくなるともに、点接触部が切刃を支えて切刃の上下移動を防止している。また、平板状の中間板が両切刃間に隙間を設けて介装されているので、上下の切刃の基部が接触しないように遮蔽している。
【０００７】
また、請求項２記載の発明は、基部を本体に固定して対向配置した上下一対の保持板と、櫛状の刃部を有し、両保持板間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃と、両切刃間に隙間を設けて介装されて上下の切刃の基部が接触しないよう遮蔽する平板状の中間材と、を備えた刈込み装置において、中間材に可動切刃表面と線接触する線接触部を設けてなることを特徴として構成している。
【０００８】
このような刈込み装置では、中間材に可動切刃表面と線接触する線接触部を設けているので、可動切刃表面が線接触部と線接触した状態で往復運動し、切刃の摺動抵抗が小さくなるともに、切刃の上下移動による駆動機構からの外れを防止している。また、可動切刃表面と中間材とが点接触する場合に比べて、可動切刃と中間材との接触圧を分散して可動切刃や中間材の磨耗をより少なくできる。また、平板状の中間板が両切刃間に隙間を設けて介装されているので、上下の切刃の基部が接触しないように遮蔽している。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態を図１乃至６に基づいて説明する。
【００１０】
図１は、本発明の参考例の刈込み装置の要部を示し、（ａ）は縦断面図であり、（ｂ）は横断面図である。また図２は、同参考例の刈込み装置の全体を示す一部破断した側面図である。
【００１１】
図１、図２に示すように、この刈込み装置は、基部を本体に固定して対向配置した上下一対の保持板１ａ，１ｂと、櫛状の刃部を有し、両保持板１ａ，１ｂに保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃２ａ，２ｂと、両切刃２ａ，２ｂ間に介装されて上下の切刃２ａ，２ｂの基部が接触しないよう遮蔽する中間材３とを備えた刈込み装置であり、中間材３に可動切刃表面と点接触する点接触部を設けている。また、貫通孔３ｅを有して基部側に固定されたプレート材３ａと、このプレート材３ａの貫通孔３ｅに介装されてプレート材３ａ表面から突出する突出部を点接触部となす介装部材４とから中間材３を形成している。このような刈込み装置として例えば庭木バリカンが挙げられ、以下庭木バリカンに関して説明を行う。
【００１２】
庭木バリカンは、ハウジング１５の前部に長尺の上下の切刃２ａ，２ｂを突出させ、上部にスイッチ１６を有するグリップ１０を設け、ハウジング１５よりも上側に補助グリップ１３を備えている。ハウジング１５の内部にはモータ１２および減速ブロック１４を設け、この減速ブロック１４に回転出力軸７が取り付けられている。保持板１ａ，１ｂは、本体下部に基部が固定され長手方向に間隔を隔ててリベットのような結合部（図示せず）にて遊嵌結合し、この両保持板１ａ，１ｂ間に上下の切刃２ａ，２ｂを往復運動自在に保持している。
【００１３】
偏心カム６ａ，６ｂは、略円盤状に形成され、モータ１２および減速ブロック１４に結合された回転出力軸７に上側用と下側用のものがそれぞれ中心をずらして上下に離間して固定され、回転出力軸７の回転により楕円回転するおうにしている。また上下の偏心カム６ａ，６ｂは互いに回転の位相が１８０度反対になるよう回転出力軸７に固定され、上側用の偏心カム６ａが前側に突出したときには、下側用の偏心カム６ｂは後側に突出する。
【００１４】
また、上下の切刃２ａ，２ｂには対応する偏心カム６ａ，６ｂに係合する左右方向に長径、前後方向すなわち切刃往復方向に短径を有する楕円形状の連係孔２ｃ、２ｄがそれぞれ形成されている。そして、上側の偏心カム６ａを上側の切刃２ａの連係孔２ｃに係合し、下側の偏心カム６ｂを下側の切刃２ｂの連係孔２ｄに係合し、モータ１２および減速ブロック１４にて回転出力軸７を低速回転させて上下の切刃２ａ，２ｂを互いに反対方向に往復運動させることができるようしてある。切刃２ａ，２ｂはそれぞれ両側縁に沿って櫛状の刃部を有し、差動状に往復運動して刃部を擦り合わせることによって、庭木の枝などを切断する。
【００１５】
また、中間材３は、略平板状に形成され、後部が下側の保持板１ｂに固定され、前部に偏心カム６ａ，６ｂを収納する半円形状の凹部を有し、凹部の両側片３ｂがそれぞれ切刃２ａ，２ｂを左右で接触しないように仕切っている。左右それぞれの両側片３ｂ略中央には長方形形状の貫通孔３ｅがそれぞれ設けられ、この貫通孔３ｅ内にそれぞれ両側片３ｂよりも厚みの大きい矩形体形状の介装部材４が内嵌されている。介装部材４の上下端部はそれぞれ両側片３ｂ表裏面よりも突出して突出部を形成しており、この突出部の上端面および下端面が上下の刃の下面および上面に接して保持されている。介装部材４としては摩擦係数の小さい材料のものを適宜用いることができる。
【００１６】
このような庭木バリカンでは、スイッチ１６を投入してモータ１２を回転させることにより、減速ブロック１４を介して回転出力軸７が低速回転し、偏心カム６ａ，６ｂが互いに連係孔２ｃ，２ｄ内で１８０度位相の異なる楕円回転を行う。この偏心カム６ａ，６ｂの楕円回転により連係孔２ｃ，２ｄの短径方向の異なる向きに切刃２ａ，２ｂが差動状に往復運動させられ切断作用をなす。
【００１７】
このとき、中間材３にの可動切刃表面と接触する点接触部を有する介装部材４を設けているので、可動切刃表面が点接触部と点接触した状態で往復運動し、切刃２の摺動抵抗が小さくなるともに、切刃２ａ，２ｂの上下移動による駆動機構からの外れ、すなわち連係孔２ｃ，２ｄからの偏心カム６ａ，６ｂの脱落を防止している。また、プレート材３ａの貫通孔３ｅに介装された介装部材４の突出部を中間材３の点接触部としているので、可動切刃２がこの突出部と点接触した状態で摺動している。また、介装部材４として摩擦係数の小さい材料のものを用いているので、切刃２ａ，２ｂと介装部材４との摺動抵抗をより小さくでき、モータ１２への負荷が小さいものとなっている。
【００１８】
図３は、本発明の実施の形態の刈込み装置を示す要部の縦断面図である。
【００１９】
図３に示すように、この刈込み装置は同上に示す刈込み装置と同様に、基部を本体に固定して対向配置した上下一対の保持板１ａ，１ｂと、櫛状の刃部を有し、両保持板１ａ，１ｂ間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃２ａ，２ｂと、両切刃２ａ，２ｂ間に介装されて上下の切刃２ａ，２ｂの基部が接触しないよう遮蔽する中間材３とを備えた刈込み装置であり、中間材３に可動切刃表面と点接触する点接触部を設けている。異なる点は、介装部材４を貫通孔３ｅ内で回転可能な球状に形成していることである。
このような刈込み装置では、介装部材４を貫通孔３ｅ内で回転可能な球状に形成しているので、切刃２ａ，２ｂが球状の介装部材４の突出部で点接触して摺動したときに、介装部材４が貫通孔３ｅ内で回転し、切刃２ａ，２ｂや介装部材４の磨耗をより少なくできる。
【００２０】
図４は、本発明の同上と異なる実施の形態の刈込み装置を示す要部の縦断面図である。
【００２１】
図４に示すように、この刈込み装置は同上に示す刈込み装置と同様に、基部を本体に固定して対向配置した上下一対の保持板１ａ，１ｂと、櫛状の刃部を有し、両保持板１ａ，１ｂ間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃２ａ，２ｂと、両切刃２ａ，２ｂ間に介装されて上下の切刃２ａ，２ｂの基部が接触しないよう遮蔽する中間材３とを備えた刈込み装置であり、中間材３に可動切刃表面と点接触する点接触部を設けている。異なる点は、接触部を切刃往復方向に並設していることである。接触部は、プレート状の中間材３の切刃２ａ，２ｂ間の部分を刃の往復方向に数個の山谷を有する波型に成形し、この波型部３ｆの山の頂部を上側切刃２ａとの点接触部とし、谷の底部を下側切刃２ｂとの点接触部としている。
【００２２】
このような刈込み装置では、接触部を切刃往復方向に並設しているので、切刃２ａ，２ｂが複数の介装部材４と点接触して摺動し、切刃２ａ，２ｂの往復運動が安定しており、低負荷なものとなっている。また切刃２ａ，２ｂと介装部材４との接触圧を分散して切刃２ａ，２ｂや介装部材４の磨耗をより少なくしている。
【００２３】
図５は、本発明の同上と異なる実施の形態の刈込み装置を示す要部の縦断面図である。
【００２４】
図５に示すように、この刈込み装置は同上に示す刈込み装置と同様に、基部を本体に固定して対向配置した上下一対の保持板１ａ，１ｂと、櫛状の刃部を有し、両保持板１ａ，１ｂ間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃２ａ，２ｂと、両切刃２ａ，２ｂ間に介装されて上下の切刃２ａ，２ｂの基部が接触しないよう遮蔽する中間材３とを備えた刈込み装置であり、中間材３に可動切刃表面と点接触する点接触部を設けている。異なる点は、可動切刃内面の切刃往復方向に凹部８を設け、この凹部８内に中間材３を保持するようにしていることである。凹部８は左右の両側片３ｂの切刃往復方向に長手方向を有する溝状に形成され、中間材３を凹部８内で回転移動可能な球状に形成している。中間材３は上端が凹部８内面、下端が下側の切刃２ｂ上面に接した状態で保持されており、上側の切刃２ａが前方へ移動すなわち下側の切刃２ｂが後方へ移動したとき、中間材３と切刃２との摩擦により中間材３は前回転しながら凹部８後方へ移動する。また、逆に上側の切刃２ａが後方へ移動すなわち下側の切刃２ｂが前方へ移動したとき、中間材３と切刃２との摩擦により中間材３は後回転しながら凹部８前方へ移動する。
【００２５】
このような刈込み装置では、中間材３が凹部８内で回転自在に保持されているので、プレート材３ａのような中間材３を保持固定するための部材を必要とせず、部品点数を低減できる。また可動切刃２が球状の中間材３と点接触して摺動したときに、中間材３が凹部８内の切刃往復方向に回転移動するので、可動切刃２と中間材３との磨耗をより少なくできる。
【００２６】
図６は、本発明の同上と異なる実施の形態の刈込み装置を示す要部の縦断面図である。
【００２７】
図６に示すように、この刈込み装置は、基部を本体に固定して対向配置した上下一対の保持板１ａ，１ｂと、櫛状の刃部を有し、両保持板１ａ，１ｂ間に保持されて差動状に往復運動して刃部を擦り合わせて切断作用をなす少なくとも一方を可動とした上下一対の切刃２ａ，２ｂと、両切刃２ａ，２ｂ間に介装されて上下の切刃２ａ，２ｂの基部が接触しないよう遮蔽する中間材３とを備えた刈込み装置であり、中間材３に可動切刃表面と線接触する線接触部を設けている。線接触部は、プレート状の中間材３における上下切刃２の間の部分を刃の往復方向に長い凹溝状に成形し、この凹溝状部の底面が下側の切刃２ｂの上面に接触するようにしている。
【００２８】
このような刈込み装置では、中間材３に可動切刃２表面と接触する線接触部を設けているので、可動切刃表面が線接触部と線接触した状態で往復運動し、切刃２ａ，２ｂの摺動抵抗が小さくなるともに、切刃２ａ，２ｂの上下移動による駆動機構からの外れを防止している。また、可動切刃表面が接触部とが点接触する場合に比べて、切刃２ａ，２ｂと中間材３との接触圧を分散して切刃２ａ，２ｂや中間材３の磨耗をより少なくできる。
【００２９】
【発明の効果】
請求項１の発明は、中間材に可動切刃表面と点接触する点接触部を設けているので、中間材の点接触部が可動切刃表面と点接触した状態で往復運動し、切刃の摺動抵抗が小さくなるともに、接触部が切刃を支えて切刃の上下移動を防止している。また、平板状の中間板が両切刃間に隙間を設けて介装されているので、上下の切刃の基部が接触しないように遮蔽している。したがって、切刃や中間材の部品精度や組み立て精度のバラツキなどがあっても、切刃と中間材との面接触による磨耗や運動能力の低下を防止できるとともに、切刃の上下移動による上下切刃の接触や駆動機構からの外れなどを防止できる。
【００３０】
請求項２の発明は、中間材に可動切刃表面と線接触する線接触部を設けているので、可動切刃表面が線接触部と線接触した状態で往復運動し、切刃の摺動抵抗が小さくなるともに、切刃の上下移動による駆動機構からの外れを防止している。また、可動切刃表面と中間材とが点接触する場合に比べて、可動切刃と中間材との接触圧を分散して可動切刃や中間材の磨耗をより少なくできる。また、平板状の中間板が両切刃間に隙間を設けて介装されているので、上下の切刃の基部が接触しないように遮蔽している。
【図面の簡単な説明】
【図１】本発明の参考例の刈込み装置の要部を示し、（ａ）は縦断面図であり、（ｂ）は横断面図である。
【図２】同参考例の刈込み装置の全体を示す一部破断した側面図である。
【図３】本発明の実施の形態の刈込み装置を示す要部の縦断面図である。
【図４】本発明の同上と異なる実施の形態の刈込み装置を示す要部の縦断面図である。
【図５】本発明の同上と異なる実施の形態の刈込み装置を示す要部の縦断面図である。
【図６】本発明の同上と異なる実施の形態の刈込み装置を示す要部の縦断面図である。
【図７】従来の刈込み装置を示す要部の縦断面図である。
【符号の説明】
１保持板
１ａ上側の保持板
１ｂ下側の保持板
２切刃
２ａ上側の切刃
２ｂ下側の切刃
２ｃ上側の切刃の連係孔
２ｄ下側の切刃の連係孔
３中間材
３ａプレート材
３ｂ両側片
３ｃ波型部
３ｄ凹溝部
３ｅ貫通孔
３ｆ波型部
４介装部材
６偏心カム
６ａ上側の偏心カム
６ｂ下側の偏心カム
７回転出力軸
８凹部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pruning device used for pruning trees such as garden trees and mowing.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, as a trimming device, there is a pair of upper and lower holding plates 1a, 1b arranged to face each other with a base fixed to the main body, and a comb-shaped blade portion between the holding plates 1a, 1b. A pair of upper and lower cutting blades 2a, 2b that are held and differentially reciprocate to rub together and cut at least one of them to move, and interposed between the two cutting blades 2a, 2b. The thing provided with the intermediate material 3 which shields so that the base of the cutting blade 2 may not contact is proposed. As the intermediate material 3, for example, a material softer than the cutting blade 2 such as a resin material, or a plate-like material whose rear end portion is fixed to the rear end portion of the lower holding plate 1 b is used. . A gap is formed between the surface of the intermediate material 3 and the surfaces of the upper and lower cutting blades 2a and 2b, and the cutting blade 2 and the intermediate material 3 do not move while being always in contact with the reciprocating motion of the cutting blade 2. I am doing so. Even if the cutting blade 2 moves up and down during reciprocating movement and contacts the intermediate material 3, the intermediate material 3 is softer than the cutting blade 2, so that the cutting blade 2 is prevented from being worn or chipped. ing.
[0003]
[Problems to be solved by the invention]
However, in the conventional trimming device, depending on variations in the component accuracy and assembly accuracy of the cutting blade and the intermediate material, the cutting blade and the intermediate material may come into surface contact with each other to increase the sliding resistance. In some cases, an increase occurs, the vertical movement of the cutting blade increases, the upper and lower cutting blades come into contact with each other, or the cutting blade comes off the holding mechanism.
[0004]
The present invention has been made in view of the above-mentioned reasons, and the purpose thereof is wear and tear due to surface contact between the cutting blade and the intermediate material, even if there are variations in the component accuracy and assembly accuracy of the cutting blade and the intermediate material. An object of the present invention is to provide a trimming device that can prevent an increase in exercise load and prevent contact between upper and lower cutting blades and detachment from a holding mechanism due to vertical movement of the cutting blades.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 has a pair of upper and lower holding plates which are arranged to face each other with the base fixed to the main body, and a comb-like blade portion, and is held between both holding plates to reciprocate in a differential manner. A pair of upper and lower cutting blades that move at least one of the blades by rubbing the blades, and a flat plate that is interposed between the two cutting blades with a gap between them and shields the bases of the upper and lower cutting blades from contacting each other The intermediate material is provided with a point contact portion that makes point contact with the surface of the movable cutting blade.
[0006]
In such a trimming device, the intermediate material is provided with a point contact portion that makes point contact with the surface of the movable cutting blade, so that the point contact portion of the intermediate material reciprocates with the point of contact with the surface of the movable cutting blade. The point contact portion supports the cutting blade and prevents the cutting blade from moving up and down. Further, since the flat intermediate plate is interposed with a gap between the two cutting blades, the base portions of the upper and lower cutting blades are shielded from contact.
[0007]
Further, the invention according to claim 2 has a pair of upper and lower holding plates which are arranged to face each other with the base fixed to the main body, and a comb-shaped blade portion, and is held between both holding plates so as to be reciprocated in a differential manner. Then, a pair of upper and lower cutting blades which are movable by cutting at least one of them by rubbing the blade portions, and a gap between the two cutting blades are provided so as to shield the base portions of the upper and lower cutting blades from contacting each other. In the trimming device provided with the flat plate-like intermediate material, the intermediate material is provided with a line contact portion that makes line contact with the surface of the movable cutting blade.
[0008]
In such a mowing apparatus, since is provided a line contact portion to the intermediate member to contact the movable cutting blade surface and the line, and reciprocates in a state where the movable cutting blade surface in contact line contact portion and the line, the cutting edges slide While the resistance is reduced, the cutting blade is prevented from coming off from the drive mechanism due to the vertical movement. Further, compared to a case where the surface of the movable cutting edge and the intermediate material are in point contact, the contact pressure between the movable cutting blade and the intermediate material can be dispersed to reduce the wear of the movable cutting blade and the intermediate material. Further, since the flat intermediate plate is interposed with a gap between the two cutting blades, the base portions of the upper and lower cutting blades are shielded from contact.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0010]
FIG. 1 shows a main part of a trimming apparatus according to a reference example of the present invention, in which (a) is a longitudinal sectional view and (b) is a transverse sectional view. Moreover, FIG. 2 is the partially broken side view which shows the whole trimming apparatus of the reference example.
[0011]
As shown in FIG. 1 and FIG. 2, this trimming device has a pair of upper and lower holding plates 1a and 1b arranged to face each other with the base fixed to the main body, and a comb-shaped blade, and both holding plates 1a and 1b. And a pair of upper and lower cutting blades 2a and 2b, which are movable and at least one of which is movable by reciprocating in a differential manner and rubbing the blade portions together, and is interposed between the two cutting blades 2a and 2b. This is a trimming device including an intermediate member 3 that shields the bases of the upper and lower cutting edges 2a and 2b from coming into contact with each other, and the intermediate member 3 is provided with a point contact portion that makes point contact with the surface of the movable cutting edge. Further, a plate member 3a having a through hole 3e and fixed to the base side, and an interposer that is interposed in the through hole 3e of the plate member 3a and protrudes from the surface of the plate member 3a becomes a point contact portion. The intermediate member 3 is formed from the member 4. An example of such a trimming device is a garden tree hair clipper, which will be described below.
[0012]
The garden-wood hair clipper has long upper and lower cutting edges 2 a and 2 b projecting from the front portion of the housing 15, a grip 10 having a switch 16 at the top, and an auxiliary grip 13 above the housing 15. A motor 12 and a speed reduction block 14 are provided inside the housing 15, and the rotation output shaft 7 is attached to the speed reduction block 14. The holding plates 1a and 1b have bases fixed to the lower part of the main body, and are loosely connected by a connecting portion (not shown) such as a rivet at intervals in the longitudinal direction. The cutting edges 2a and 2b are held so as to be freely reciprocated.
[0013]
The eccentric cams 6a and 6b are formed in a substantially disk shape, and the upper and lower ones are fixed to the rotary output shaft 7 coupled to the motor 12 and the speed reduction block 14 with their centers shifted from each other up and down. The ellipse is rotated by the rotation of the rotation output shaft 7. The upper and lower eccentric cams 6a and 6b are fixed to the rotation output shaft 7 so that their rotational phases are opposite to each other by 180 degrees. When the upper eccentric cam 6a projects forward, the lower eccentric cam 6b Protrudes to the side.
[0014]
The upper and lower cutting edges 2a and 2b are respectively formed with elliptical linking holes 2c and 2d having a long diameter in the left-right direction and a short diameter in the front-rear direction, that is, the reciprocating direction of the cutting edge, which engage with the corresponding eccentric cams 6a and 6b. Has been. Then, the upper eccentric cam 6a is engaged with the linkage hole 2c of the upper cutting edge 2a, the lower eccentric cam 6b is engaged with the linkage hole 2d of the lower cutting edge 2b, and the motor 12 and the deceleration block 14 are engaged. The rotary output shaft 7 is rotated at a low speed so that the upper and lower cutting edges 2a and 2b can reciprocate in opposite directions. Each of the cutting blades 2a and 2b has a comb-shaped blade portion along both side edges, and cuts a branch of a garden tree by reciprocating in a differential manner and rubbing the blade portions.
[0015]
The intermediate member 3 is formed in a substantially flat plate shape, the rear part is fixed to the lower holding plate 1b, the front part has a semicircular concave part that houses the eccentric cams 6a and 6b, and both side pieces of the concave part are provided. 3b partitions the cutting edges 2a and 2b so as not to contact each other on the left and right. A rectangular through-hole 3e is provided in the approximate center of each of the left and right side pieces 3b, and a rectangular interposing member 4 having a thickness larger than that of the both side pieces 3b is fitted in the through-hole 3e. . The upper and lower ends of the interposing member 4 protrude from the front and back surfaces of the side pieces 3b to form protrusions. The upper and lower surfaces of the protrusions are held in contact with the lower and upper surfaces of the upper and lower blades. Yes. As the interposition member 4, a material having a small friction coefficient can be used as appropriate.
[0016]
In such a garden tree hair clipper, by turning on the switch 16 and rotating the motor 12, the rotation output shaft 7 rotates at a low speed via the deceleration block 14, and the eccentric cams 6a and 6b are mutually connected in the coupling holes 2c and 2d. Ellipse rotation with a phase difference of 180 degrees is performed. Due to the elliptical rotation of the eccentric cams 6a and 6b, the cutting blades 2a and 2b are reciprocally moved in different directions in the minor axis direction of the coupling holes 2c and 2d to perform a cutting action.
[0017]
At this time, since the intermediate member 3 is provided with the interposing member 4 having a point contact portion that comes into contact with the surface of the movable cutting edge, the intermediate blade 3 reciprocates with the point of contact of the movable cutting blade surface with the point contact portion. 2, the sliding resistance of the cutting blades 2a and 2b is prevented from coming off from the drive mechanism, that is, the eccentric cams 6a and 6b are prevented from dropping from the linkage holes 2c and 2d. Further, since the protruding portion of the interposing member 4 interposed in the through hole 3e of the plate material 3a is used as the point contact portion of the intermediate material 3, the movable cutting blade 2 slides in a state of point contact with the protruding portion. ing. Further, since a material having a small friction coefficient is used as the interposing member 4, the sliding resistance between the cutting blades 2a, 2b and the interposing member 4 can be further reduced, and the load on the motor 12 is small. ing.
[0018]
Figure 3 is a sectional view of a main part showing a mowing apparatus of the implementation of the embodiment of the present invention.
[0019]
As shown in FIG. 3, this trimming device has a pair of upper and lower holding plates 1 a and 1 b that are arranged to face each other with the base fixed to the main body, and a comb-shaped blade portion, similar to the trimming device shown above. A pair of upper and lower cutting blades 2a, 2b that are held between the holding plates 1a, 1b and differentially reciprocate to rub the blade portions to make a cutting action and move at least one, and both cutting blades 2a, 2b A trimming device provided with an intermediate member 3 that is interposed between and shields the bases of the upper and lower cutting blades 2a, 2b from contacting each other, and is provided with a point contact portion that makes point contact with the surface of the movable cutting blade. ing. The difference is that the interposed member 4 is formed in a spherical shape that can rotate in the through hole 3e.
In such a trimming device, the intervention member 4 is formed in a spherical shape that can rotate in the through hole 3e, so that the cutting edges 2a and 2b slide in point contact with the protruding portion of the spherical intervention member 4. When this is done, the interposed member 4 rotates within the through hole 3e, and the wear of the cutting blades 2a, 2b and the interposed member 4 can be reduced.
[0020]
FIG. 4 is a longitudinal sectional view of a main part showing a trimming device according to an embodiment different from the above-mentioned embodiment of the present invention.
[0021]
As shown in FIG. 4, this trimming device has a pair of upper and lower holding plates 1 a and 1 b that are arranged to face each other with the base fixed to the main body, and a comb-shaped blade portion, similar to the trimming device shown above. A pair of upper and lower cutting blades 2a, 2b that are held between the holding plates 1a, 1b and differentially reciprocate to rub the blade portions to make a cutting action and move at least one, and both cutting blades 2a, 2b A trimming device provided with an intermediate member 3 that is interposed between and shields the bases of the upper and lower cutting blades 2a, 2b from contacting each other, and is provided with a point contact portion that makes point contact with the surface of the movable cutting blade. ing. The difference is that the contact portions are arranged side by side in the reciprocating direction of the cutting edge. The contact portion is formed by forming a portion between the cutting edges 2a and 2b of the plate-shaped intermediate member 3 into a corrugated shape having several peaks and valleys in the reciprocating direction of the blade, and the top of the corrugated portion 3f is the upper cutting edge. It is set as the point contact part with 2a, and the bottom part of the valley is made into the point contact part with the lower side cutting blade 2b.
[0022]
In such a trimming device, the contact portions are arranged side by side in the reciprocating direction of the cutting edge, so that the cutting edges 2a and 2b slide in point contact with the plurality of interposing members 4, and the reciprocating movement of the cutting edges 2a and 2b occurs. The movement is stable and the load is low. Further, the contact pressure between the cutting blades 2a, 2b and the interposition member 4 is dispersed to reduce wear of the cutting blades 2a, 2b and the interposition member 4.
[0023]
FIG. 5 is a longitudinal sectional view of a main part showing a trimming apparatus according to an embodiment different from the above-mentioned embodiment of the present invention.
[0024]
As shown in FIG. 5, this trimming device has a pair of upper and lower holding plates 1 a and 1 b that are arranged to face each other with the base fixed to the main body, and a comb-shaped blade portion, similar to the trimming device shown above. A pair of upper and lower cutting blades 2a, 2b that are held between the holding plates 1a, 1b and differentially reciprocate to rub the blade portions to make a cutting action and move at least one, and both cutting blades 2a, 2b A trimming device provided with an intermediate member 3 that is interposed between and shields the bases of the upper and lower cutting blades 2a, 2b from contacting each other, and is provided with a point contact portion that makes point contact with the surface of the movable cutting blade. ing. The difference is that a recess 8 is provided in the reciprocating direction of the cutting edge on the inner surface of the movable cutting edge, and the intermediate material 3 is held in the recess 8. The concave portion 8 is formed in a groove shape having a longitudinal direction in the reciprocating direction of the cutting edges of the left and right side pieces 3 b, and the intermediate material 3 is formed in a spherical shape that can rotate and move in the concave portion 8. The intermediate material 3 is held in a state where the upper end is in contact with the inner surface of the recess 8 and the lower end is in contact with the upper surface of the lower cutting edge 2b, and the upper cutting edge 2a moves forward, that is, the lower cutting edge 2b moves rearward. At this time, the intermediate material 3 moves to the rear of the concave portion 8 while rotating forward due to the friction between the intermediate material 3 and the cutting edge 2. On the contrary, when the upper cutting edge 2a moves backward, that is, when the lower cutting edge 2b moves forward, the intermediate material 3 is rotated backward by the friction between the intermediate material 3 and the cutting blade 2 and forward of the recess 8. Moving.
[0025]
In such a trimming device, since the intermediate member 3 is rotatably held in the recess 8, no member for holding and fixing the intermediate member 3 such as the plate member 3a is required, and the number of parts can be reduced. . When the movable cutting blade 2 slides in point contact with the spherical intermediate material 3, the intermediate material 3 rotates in the reciprocating direction of the cutting blade in the recess 8, so that the movable cutting blade 2 and the intermediate material 3 Wear can be reduced.
[0026]
FIG. 6 is a longitudinal sectional view of a main part showing a trimming apparatus according to an embodiment different from the above-mentioned embodiment of the present invention.
[0027]
As shown in FIG. 6, this trimming device has a pair of upper and lower holding plates 1a, 1b arranged to face each other with the base fixed to the main body, and a comb-shaped blade, and is held between both holding plates 1a, 1b. Then, a pair of upper and lower cutting blades 2a and 2b having at least one of which is movable by reciprocating in a differential manner and rubbing the blade portions to move, and interposed between the two cutting blades 2a and 2b. The cutting device includes an intermediate member 3 that shields the bases of the cutting blades 2a and 2b from coming into contact with each other, and the intermediate member 3 is provided with a line contact portion that makes line contact with the surface of the movable cutting blade. The line contact portion is formed by forming a portion between the upper and lower cutting blades 2 in the plate-like intermediate material 3 into a groove shape that is long in the reciprocating direction of the blade, and the bottom surface of the groove portion is the upper surface of the lower cutting blade 2b. To touch.
[0028]
In such a trimming device, the intermediate member 3 is provided with a line contact portion that comes into contact with the surface of the movable cutting blade 2, so that the movable blade surface reciprocates in a line contact with the line contact portion, and the cutting blade 2 a, While the sliding resistance of 2b becomes small, the cutting blades 2a and 2b are prevented from coming off from the drive mechanism due to vertical movement. In addition, the contact pressure between the cutting blades 2a and 2b and the intermediate material 3 is dispersed to reduce the wear of the cutting blades 2a and 2b and the intermediate material 3 compared to the case where the movable cutting blade surface is in point contact with the contact portion. it can.
[0029]
【The invention's effect】
According to the first aspect of the present invention, since the intermediate member is provided with the point contact portion that makes point contact with the surface of the movable cutting edge, the intermediate material reciprocates in a state where the point contact portion is in point contact with the movable cutting blade surface. The sliding resistance of the blade is reduced, and the contact portion supports the cutting blade to prevent the cutting blade from moving up and down. Further, since the flat intermediate plate is interposed with a gap between the two cutting blades, the base portions of the upper and lower cutting blades are shielded from contact. Therefore, even if there is a variation in the accuracy of the cutting blade and intermediate parts, as well as assembly accuracy, it is possible to prevent wear due to surface contact between the cutting edge and the intermediate material and a reduction in motor capability, and to make vertical cutting by moving the cutting blade up and down. It is possible to prevent contact of the blades and detachment from the drive mechanism.
[0030]
A second aspect of the present invention, since the provided line contact portion to the intermediate member to contact the movable cutting blade surface and the line, and reciprocates in a state where the movable cutting blade surface in contact line contact portion and the line, the cutting edges slide While the resistance is reduced, the cutting blade is prevented from coming off from the drive mechanism due to the vertical movement. Further, compared to a case where the surface of the movable cutting edge and the intermediate material are in point contact, the contact pressure between the movable cutting blade and the intermediate material can be dispersed to reduce the wear of the movable cutting blade and the intermediate material. Further, since the flat intermediate plate is interposed with a gap between the two cutting blades, the base portions of the upper and lower cutting blades are shielded from contact.
[Brief description of the drawings]
FIG. 1 shows a main part of a trimming apparatus according to a reference example of the present invention, in which (a) is a longitudinal sectional view and (b) is a transverse sectional view.
FIG. 2 is a partially broken side view showing the entire trimming device of the reference example .
3 is a longitudinal sectional view of a main part showing a mowing apparatus of the implementation of the embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of a main part showing a trimming device according to an embodiment different from the embodiment of the present invention.
FIG. 5 is a longitudinal sectional view of a main part showing a trimming device according to an embodiment different from the embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of an essential part showing a trimming device according to an embodiment different from the embodiment of the present invention.
FIG. 7 is a longitudinal sectional view of a main part showing a conventional trimming device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holding plate 1a Upper holding plate 1b Lower holding plate 2 Cutting blade 2a Upper cutting blade 2b Lower cutting blade 2c Upper cutting blade linkage hole 2d Lower cutting blade linkage hole 3 Intermediate material 3a Plate Material 3b Both-side piece 3c Corrugated part 3d Concave groove part 3e Through hole 3f Corrugated part 4 Interposition member 6 Eccentric cam 6a Upper eccentric cam 6b Lower eccentric cam 7 Rotation output shaft 8 Recessed part

Claims

It has a pair of upper and lower holding plates that are fixedly opposed to each other with the base fixed to the main body, and a comb-shaped blade. And a pair of upper and lower cutting blades that are movable, and a flat intermediate member that is interposed between the two cutting blades so as to shield the base portions of the upper and lower cutting blades from contacting each other. In the trimming device, the trimming device is provided with a point contact portion in point contact with the surface of the movable cutting blade on the intermediate material.

It has a pair of upper and lower holding plates that are fixedly opposed to each other with the base fixed to the main body, and a comb-shaped blade. And a pair of upper and lower cutting blades that are movable, and a flat intermediate member that is interposed between the two cutting blades so as to shield the base portions of the upper and lower cutting blades from contacting each other. In the trimming device, the trimming device is characterized in that the intermediate member is provided with a line contact portion that is in line contact with the surface of the movable cutting blade.