JP3583007B2

JP3583007B2 - Stem / culm locking / conveying device and locking claw used for the device

Info

Publication number: JP3583007B2
Application number: JP04993599A
Authority: JP
Inventors: 宗之河瀬; 外和寺尾; 片山　　靖彦
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 1999-02-26
Filing date: 1999-02-26
Publication date: 2004-10-27
Anticipated expiration: 2019-02-26
Also published as: JP2000245231A

Description

【０００１】
【発明の属する技術分野】
本発明は、コンバインやバインダーなどの農作業機で用いられる茎稈係止搬送装置と、その茎稈係止搬送装置で用いられる係止爪の改良に関する。
【０００２】
【従来の技術】
上記のような農作業機の茎稈係止搬送装置、およびその係止爪としては、例えば、図９（イ），（ロ）に示される構造のものが従来より知られている。
この従来構造は、コンバインの引起し装置に適用された例であり、爪長手方向での一端側を無端回動チェーン３に取付けた係止爪４を備え、この係止爪４の爪先端側が前記無端回動チェーン３を覆う引起しケース１から突出する状態で設けられている。
そして、この係止搬送装置に用いられる係止爪４は、断面形状略Ｕ字状に形成された合成樹脂材料で構成されているとともに、そのＵ字の内部空間に、爪長手方向を横切る方向で補強リブ５を形成して、軽量な係止爪４の保形強度を十分に高められるように構成していた。
【０００３】
【発明が解決しようとする課題】
上記の従来技術によれば、係止爪を合成樹脂材料で構成し、かつ、断面Ｕ字状に形成するとともに補強リブを採用しているので、比較的軽量なものでありながら、その保形強度を高められる点で有用なものであるが、次のような問題があった。
すなわち、この種の農作業機では、その作業に伴って、茎稈係止搬送装置の係止爪が、多量の茎稈の搬送途中での停滞や詰まり発生などに起因する大きな移動抵抗を受けたり、係止爪が土中に突入して大きな移動抵抗を受ける虞を完全に排除することは困難である。
従来では、このような事態の発生に対して、係止爪自体の保形強度を高めることで、ある程度の大きさまでの抵抗には対応し、それ以上に抵抗が増大した場合には合成樹脂製の係止爪が塑性変形することで、係止爪は変形もしくは損壊するが、仮にその変形や損壊が生じずに異常な過負荷が生じた場合に予測される関連他装置の二次的な損壊を避けるように工夫されていた。
【０００４】
しかしながら、上記の従来の係止爪では、補強リブを用いるなどして合成樹脂製係止爪の全体的な保形強度を高め、移動抵抗に対する爪の変形を抑制することを意図するだけのものであったため、次のような新たな問題が生じていた。
つまり、係止爪が全体的な保形強度を高められていることによって、変形し難い爪を変形させようとする作用力は、係止爪の取付部近くに集中的に作用する傾向がある。そして、係止爪の根元部は回動チェーンに対する取付強度を確保するために移動抵抗の作用方向では簡単には曲がり難い構成となっている。
このため、極限まで抵抗していた係止爪は、限界を越えると座屈して根元部近くが大きく変形または損壊する傾向がある。そして、係止爪の根元近くは、回動チェーンを覆うカバー体の案内部による案内作用を受けながら移動し、所定位置に達するとカバー体内に引き込まれるように構成されているものが多いので、上述のような大きな変形あるいは損壊が係止爪の根元近く、つまり、回動チェーンへの取付部近くで生じると、係止爪の座屈変形部分が、係止爪の移動に伴ってカバー体の案内部分を拡開変形させたり、爪以外のカバー体や他部材と強く接触して食い込みを生じるなど、爪のさらなる損傷に伴って他部材も損傷させる可能性がある。
このような不都合を回避するには、例えば、係止爪をさらに強靱にして変形し難くしたり、逆に、簡単に曲がり変形し易い軟質の部材とすることも考えられるが、前者の場合は、装置全体の設計強度を増大する必要が生じてコスト増につながる傾向があり、また後者の場合は、十分な搬送力を得難いという問題がある。
【０００５】
本発明の目的は、簡単な構造で所要の搬送力を得ることができると共に、係止爪の変形がケースや他装置の損傷を招く虞の少ない構造の係止爪、及び、その爪を用いた茎稈係止搬送装置を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するために講じた本発明の茎稈係止搬送装置についての技術手段は、次の通りである。
すなわち、請求項１に記載のように、爪長手方向での一端側が無端回動チェーンに取付けられて、一方向に移動しながら茎稈を引起しまたは搬送する係止爪を備え、この係止爪の爪先端側を前記無端回動チェーンを覆うカバー体から突出させた状態で設けてある茎稈係止搬送装置において、
前記係止爪を、断面形状略Ｕ字状で、その略Ｕ字状断面の開放側とは反対側に位置して爪長手方向に沿う一側縁で構成される係止作用部と、その両側に位置して爪移動方向に沿う側面で構成されるスカート部とを備えた合成樹脂材で構成し、
前記係止爪のスカート部では、無端回動チェーンに対する連結箇所から爪先端までの長さで表される基準長さの中間位置を境にして、これよりも爪先端側における左右のスカート部の互いに離反する方向への保形強度を、爪取付端側におけるスカート部の互いに離反する方向への保形強度よりも小さく設定するとともに、
前記中間位置よりも爪取付端側においては、無端回動チェーンに対する連結箇所から前記中間位置までの範囲における爪長さ方向での中間位置に相当する取付端側中間位置を境にして、これよりも爪先端側における左右のスカート部の互いに離反する方向への保形強度を、爪取付端側におけるスカート部の互いに離反する方向への保形強度よりも小さく設定し、
この係止爪の爪長手方向での前記取付端側中間部よりも爪先端側におけるスカート部の保形強度の小さい部分が前記カバー体の外側に位置するように係止爪を取付たことである。
【０００７】
また、上記の茎稈係止搬送装置に用いる係止爪についての技術手段は次の通りである。
すなわち、請求項２に記載のように、爪長手方向での一端側を駆動手段に対する爪取付部とし他端側を爪先端側とする係止爪を、断面形状略Ｕ字状に形成された合成樹脂材料で構成するとともに、前記係止爪は、前記略Ｕ字状断面の開放側とは反対側に位置して爪長手方向に沿う一側縁で構成される係止作用部と、その両側に位置して爪移動方向に沿う側面で構成されるスカート部とを備え、
前記係止爪のスカート部では、無端回動チェーンに対する連結箇所から爪先端までの長さで表される基準長さの中間位置を境にして、これよりも爪先端側における左右のスカート部の互いに離反する方向への保形強度を、爪取付端側におけるスカート部の互いに離反する方向への保形強度よりも小さく設定するとともに、
前記中間位置よりも爪取付端側においては、無端回動チェーンに対する連結箇所から前記中間位置までの範囲における爪長さ方向での中間位置に相当する取付端側中間位置を境にして、これよりも爪先端側における左右のスカート部の互いに離反する方向への保形強度を、爪取付端側におけるスカート部の互いに離反する方向への保形強度よりも小さく設定してあることである。
【０００８】
上記係止爪としては、請求項３に記載のように、係止爪の爪移動方向に沿う側面で構成されるスカート部の爪移動方向における幅を爪取付部側端部ほど大きく設定するとともに、爪取付部における前記爪移動方向での幅の増加率を、爪長手方向中間部における前記幅の増加率よりも大きくなるように設定しても良い。
また、請求項４に記載のように、係止爪のスカート部の爪長手方向中間部における肉厚を、爪取付部側よりも薄肉に形成してもよい。
また、請求項５に記載のように、爪取付部に対する爪長手方向中間部のスカート部における肉厚の減少割合を、爪取付部に対する爪長手方向中間部の係止作用部における肉厚の減少割合よりも大きくしてもよい。
また、請求項６に記載のように、左右のスカート部の内側に、爪取付部側端部から爪長手方向の中間部近く亘る範囲で延設された補強厚肉部を形成し、この補強厚肉部どうしを、前記中間部から離れた爪取付部箇所で連結する第１リブを形成するとよい。
また、請求項７に記載のように、爪長手方向の中間部よりも爪先端側箇所の係止作用部内面に、爪取付部側箇所の第１リブよりも隆起量の少ない第２リブを形成してもよい。
【０００９】
〔作用〕
上記請求項１に記載の構成を採用することによる作用は次の通りである。
係止爪として、爪取付部箇所の左右のスカート部における互いに離反する方向への保形強度よりも、前記爪取付部側から離れた爪長手方向中間部箇所でのスカート部における互いに離反する方向への保形強度を小さく設定したものを採用したので、この係止爪は、その爪取付部箇所で座屈などの変形をする前に、その爪取付部側からはなれた爪長手方向の中間部で、スカート部を拡げて曲がり易くなる傾向がある。
しかも、その係止爪の変形は、変形が生じるまでの降伏負荷が少ない上に、爪長手方向における係止作用部の曲がり変形と、爪長手方向の中間部におけるスカート部の拡がり変形との複合的な変形となるので、爪取付部での集中的な座屈変形などに比べて、原形からの変形度合いは割合に少なくて済む。
また、係止爪の爪長手方向での中間部におけるスカート部は、係止作用部に強い移動抵抗が生じてスカート部の拡がりが生じ始めるまでの間は、その移動抵抗に抗しての係止搬送作用力の発揮手段として有効に機能し、この中間部のスカート部が拡がると中間部の係止作用部を曲がり易くして移動抵抗が爪取付部側に大きく作用すること回避する。したがって、このスカート部を含めて係止爪の全体を単なる軟質材で構成して移動抵抗が爪取付部側に大きく作用することを避けるもの等に比べて、係止搬送力を低下させすぎる虞も少ない。
そして、係止作用部の曲がりやスカート部の拡がり傾向を有した状態に爪長手方向の中間部が変形されても、この変形した部分は、前記カバー体の外側に位置するのでものであるから、係止爪の移動に伴ってカバー体の案内部を拡径変形させる虞が少ない。さらに、係止爪がカバー体の内部に引き込まれる際には、前記爪長手方向の中間部におけるスカート部の拡がり部分を元に戻す方向での抵抗が作用する程度であるから、カバー体の案内部などにあまり大きな移動抵抗を生じる虞が少ない。
【００１０】
請求項２に記載の構成を採用したことによる作用は次の通りである。
係止爪は、爪取付部箇所の左右のスカート部における互いに離反する方向への保形強度よりも、前記爪取付部側から離れた爪長手方向中間部箇所でのスカート部における互いに離反する方向への保形強度を小さく設定したものであるから、爪取付部箇所で座屈などの変形をする前に、その爪取付部側からはなれた爪長手方向の中間部で、スカート部を拡げて曲がり易くなる傾向がある。
しかも、その係止爪の変形は、変形が生じるまでの降伏負荷が少ない上に、爪長手方向における係止作用部の曲がり変形と、爪長手方向の中間部におけるスカート部の拡がり変形との複合的な変形となるので、爪取付部での集中的な座屈変形などに比べて、原形からの変形度合いは割合に少なくて済む。
また、係止爪の爪長手方向での中間部におけるスカート部は、係止作用部に強い移動抵抗が生じてスカート部の拡がりが生じ始めるまでの間は、その移動抵抗に抗しての係止搬送作用力の発揮手段として有効に機能し、この中間部のスカート部が拡がると中間部の係止作用部を曲がり易くして移動抵抗が爪取付部側に大きく作用することを回避する。したがって、このスカート部を含めて係止爪の全体を単なる軟質材で構成して移動抵抗が爪取付部側に大きく作用することを避けるもの等に比べて、係止搬送力を低下させすぎる虞も少ない。
【００１１】
【００１２】
また、請求項３に記載のように、係止爪の爪移動方向に沿う側面で構成されるスカート部の爪移動方向における幅を爪取付部側端部ほど大きく設定するとともに、爪取付部における前記爪移動方向での幅の増加率を、爪長手方向中間部における前記幅の増加率よりも大きくなるように設定すると、単に爪取付部側ほど前記爪移動方向での幅を大きくしたものに比べて、爪取付部側と爪長手方向中間部での前記幅の差をより大きくして、曲げ強度の差も極力大きくすることができ、これによっても、より確実に変形部分が爪取付部側に生じることを避け易い。
【００１３】
請求項４に記載のように、係止爪のスカート部の爪長手方向中間部における肉厚を、爪取付部側よりも薄肉に形成すると、係止爪のスカート部の拡がりを、爪取付部側よりも爪長手方向中間部で生じ易くできる。
【００１４】
請求項５に記載のように、爪取付部に対する爪長手方向中間部のスカート部における肉厚の減少割合を、爪取付部に対する爪長手方向中間部の係止作用部における肉厚の減少割合よりも大きくすると、係止爪の係止作用部での曲がり変形、ならびにスカート部での拡がりを、爪取付部側よりも爪長手方向中間部で生じ易くできる。
【００１５】
請求項６に記載のように、左右のスカート部の内側に、爪取付部側端部から爪長手方向の中間部に亘る範囲で延設された補強肉厚部を形成し、この補強厚肉部どうしを、前記爪取付部箇所で連結する第１リブを形成すると、爪取付部での変形をより確実に回避し易い。
【００１６】
請求項７に記載のように、爪長手方向の中間部よりも爪先端側箇所の係止作用部内面に、爪取付部側箇所の第１リブよりも隆起量の少ない第２リブを形成すると、爪取付部側での変形を生じ難くしながら、係止爪全体の保形強度を、これらのリブを用いない場合よりも向上させて、より強力な搬送作用力を有した係止爪を構成することが可能となる。
【００１７】
【発明の実施の形態】
次に、本発明の好ましい実施の形態を説明する。
〔全体の構成〕
本発明の茎稈係止搬送装置、及びその係止爪は、例えば、コンバインの引起し装置、分草装置、あるいは、引起しからフィードチェーンへの搬送系に用いる係止搬送装置として用いることのできるものであり、その他、バインダーや各種作物収穫機にも適用することが可能である。ここではコンバインの引起し装置に適用した場合を一実施形態として説明する。
【００１８】
図１及び図２に示すように、本発明の茎稈係止搬送装置は、カバー体としての引起しケース１内に駆動側スプロケッ２１と従動側スプロケット２２とを配置し、これらの両スプロケット２１，２２にわたって無端回動チェーン３を掛張し、この無端回動チェーン３をまたぐ状態で起伏揺動自在な多数の係止爪４を取付けて構成してある。
前記引起しケース１は、上側ケース部分１１と下側ケース部分１２とを外周フランジ部１３で面接当させた状態でボルト止めするとともに、その外周部のうち下部と一側方とに爪起立突出用の開口１５を形成してある。この開口１５は、上側ケース部分１１と下側ケース部分１２の外周縁の一部を外向きに折り曲げ加工して、前記係止爪４の起立移動姿勢を案内するように形成された案内部１４によって構成されている。
前記引起しケース１内の前記開口１５に沿う部分には、無端回動チェーン３によって一方向（図中矢印方向）へ移動させられる係止爪４の被ガイド部４１の底部と接当し、かつ無端回動チェーン３を案内する凹溝状のガイド部を備えたガイド体１６が固定されている。
したがって、この茎稈係止搬送装置の各係止爪４は、図１に示す爪先端軌跡４０を描いて移動するように、前記ガイド体１６で案内される作用範囲で起立姿勢で移動し、そこから外れた非作用範囲では引起しケース１内に引き込まれて移動する。
尚、係止爪４を起伏させるための構造は、周知の起伏構造を用いればよく、例えば、下方の従動側スプロケット２２の横側面に起立案内用の回転カム２３を設置して起立させ、作用範囲の終端で倒伏ガイド２４に接当して倒伏姿勢に切り換えられるように構成すればよい。
【００１９】
〔係止爪の構成〕
茎稈係止搬送装置に用いられる係止爪４は次のように構成されている。
図３〜図５に示すように、係止爪４の一端側を、無端回動チェーン３の取付片３０に対して連結ピン３１を挿通することにより、この連結ピン３１の軸芯Ｐまわりに回動自在に取り付けてある。
この係止爪４は、断面形状略Ｕ字状で、その略Ｕ字状断面の開放側とは反対側に位置して爪長手方向に沿う一側縁で構成される係止作用部４２と、その両側に位置して爪移動方向に沿う側面で構成される左右のスカート部４３とを備えた、ある程度の弾性を有したナイロンなどの合成樹脂材で構成されている。
【００２０】
前記係止爪４は、前記連結ピン３１の軸芯Ｐから先端までの長さで表される基準長さＬの約１／２の位置である中間位置４Ｄまでが、図３に示すように、前記係止作用部４２の幅方向（前記軸芯Ｐに沿う方向）でほぼ一定幅に形成され、これよりも先端側が徐々に先細り形状に形成されている。
説明の便宜上、係止爪４の長手方向で、前記中間位置４Ｄから先端側の範囲をさらに約１／２に分割して考えた先端側の範囲を係止爪４の先端部４Ｃ、前記中間位置４Ｄから無端回動チェーン３への取付側へ約１／２変位した位置からさらに取付端側寄りの範囲を爪取付部４Ａ、これらの爪取付部４Ａと先端部４Ｃとの間に位置する範囲を爪長手方向の中間部４Ｂとする。
【００２１】
前記係止爪４の係止作用部４２は、図４，５に示すように前記爪取付部４Ａの全体に亘ってほぼ一定の肉厚に構成され、そこから先端側へ向けて徐々に薄肉となるように形成され、先端部の湾曲部４４近くで部分的に肉厚になっている。
【００２２】
前記係止爪４の左右のスカート部４３は、前記中間位置４Ｄよりも少し爪取付端側へ寄った位置からから爪取付端にわたる範囲の内面に、各スカート部４３の肉厚を少し増すための補強厚肉部４５を備え、その補強厚肉部４５どうしを、爪取付部４Ａに相当する範囲で、係止作用部４２側から隆起する２本の第１リブ４６により互いに連結してあり、これよりも爪先端側では左右のスカート部４３を連結するリブなどの構成は備えていない。
上記補強厚肉部４５の幅は、係止爪４の中間部４Ｂの変形によっても爪取付部４Ａのスカート部４３が座屈等の変形を生じにくいように補強するに足る程度の厚みであれば良く、この実施の形態での一例としては、係止爪４の前記基準長さＬを１２８mmとし、中間位置４Ｄから爪取付側のスカート部４３の肉厚が約４．５mmとした場合に、約１〜２mm程度である。尚、前記中間位置４Ｄから爪先端側に向けてスカート部４３の肉厚は徐々に薄くなるように構成されている。
【００２３】
このように、前記スカート部４３では、前記爪取付部４Ａ箇所の左右のスカート部４３における互いに離反する方向への保形強度よりも、前記爪取付部４Ａから離れた爪長手方向中間部４Ｂ箇所でのスカート部４３における互いに離反する方向への保形強度を小さく設定し、この係止爪４の爪長手方向の中間部４Ｂにおけるスカート部４３の保形強度の小さい部分が前記引起しケース１の外側に位置するように係止爪４を無端回動チェーン３に取付てある。
すなわち、係止爪４の爪長手方向の中間部４Ｂでは、その係止作用部４２でも、スカート部４３でも、爪取付部４Ａに対して肉厚を薄く形成してあり、且つ、爪取付部４Ａ側では、補強厚肉部４５での補強や、その補強厚肉部４５どうしを繋ぐ第１リブ４６の存在によって、スカート部４３の開き方向、閉じ方向への変形が強固に抑制されている。したがって、係止爪４に移動抵抗が作用したとき、爪長手方向の中間部４Ｂでのスカート部４３の開き方向への変形を許して、その中間部４Ｂにおける係止作用部４２の曲がりを、爪取付部４Ａ側への影響が少ない状態で許し、爪取付部４Ａでの変形を確実に規制し易いように強度設定されている。
【００２４】
また、係止爪４は、その爪移動方向に沿う側面で構成されるスカート部４３の爪移動方向における幅Ｗを爪取付部４Ａ側端部ほど大きく設定するとともに、爪取付部４Ａにおける前記爪移動方向での幅Ｗの増加率を、爪長手方向中間部４Ｂにおける前記幅の増加率よりも大きくなるように設定してある。
さらに、前記スカート部４３のうち、爪長手方向で爪取付部４Ａの全範囲と、中間部４Ｂの一部には、補強厚肉部４５を形成しているので、その補強厚肉部４５の存在によって、爪取付部４Ａに対する爪長手方向中間部４Ｂのスカート部４３における肉厚の減少割合が、爪取付部４Ａに対する爪長手方向中間部４Ｂの係止作用部４２における肉厚の減少割合よりも大きくなるように、爪取付部４Ａと中間部４Ｂにおける係止作用部４２とスカート部４３との肉厚の割合が設定されることになる。
【００２５】
〔実施の形態の別例〕
図６及び図７は、係止爪４の他の実施の形態を示す。
この例では、係止爪４の爪長手方向の中間部４Ｂにおいて、前記爪取付部４Ａの第１リブ４６よりも隆起量の小さい第２リブ４７が３箇所に設けられている。
この第２リブ４７の隆起量は、約1mm であり、第１リブの隆起量、約６mmに比べて十分に小さなものであるが、第１リブ４６と併用して用いられることにより、係止爪４の爪取付部４Ａの変形を抑制しながらも、係止爪４の全体的な保形強度を増して、係止爪４の搬送作用力を増大することができる効果がある。
その他の構造は、前述の実施の形態と同様であるので省略する。
【００２６】
本発明の上記各実施の形態において説明した補強厚肉部４５は、上述のような、スカート部４３の爪移動方向の一部の範囲に設けるだけのものに限らず、スカート部４３の爪移動方向の全体にわたって形成してもよい。また、この補強厚肉部４５を設けずに、前記第１リブ４６を設ける、もしくは第１リブ４６と第２リブとを設けてもよく、さらには、第１リブ４６も第２リブ４７も用いずに補強厚肉部４５だけを用いてもよい。
【００２７】
前記補強厚肉部４５や、第１リブ４６、及び第２リブの個数や厚さ、高さ、並びに配設箇所は、係止爪４の大きさや所要強度などでによって任意に設定すればよい。
また、係止爪４の爪取付部４Ａと、中間部４Ｂと、先端部４Ｃとの相互の寸法関係は、前述した実施の形態に示すような寸法関係のみを表すものではなく、爪の長さや設置対象箇所、あるいは搬送対象物などに応じて適宜に設定されるものであり、要は、搬送時の限界を越える移動抵抗によって爪が変形する際に、その変形が爪の根元部の大きな膨らみや座屈変形となることを回避するために、前記補強厚肉部４５や第１リブ４６、あるいは第２リブ４７を設ける箇所を設定する基準の範囲とし適正なものであればよい。
【００２８】
〔実験例〕
本発明の係止爪４と従来の係止爪４との変形状態の実験結果を図８（イ），（ロ）に示す。
図８（イ）が従来の係止爪の変形状態を示し、図８（ロ）が本発明の係止爪４の変形状態を示し、何れも係止爪４の係止作用部４２の裏面側から変形状態を見たものである。
この実験は、従来例を示す図９に示すように、係止爪４の係止作用部４２に対向させて、その長手方向ほ中間位置４Ｄよりも少し先端側寄り位置に鉄製の丸棒６を接触させ、係止爪４を爪取付端で完全に固定して、鉄製丸棒６を茎稈と同様に爪移動方向に沿って移動させることによって行った。
図８（イ）に示す従来のものでは、係止爪４の先端部や中間部の形状の崩れはそれほど大きくないが、爪取付部４Ａ箇所で大きく座屈変形して、同図中の爪中心線ＣＬから左方へ部分的に膨出する変形量が特に大きく、右方ではむしろ凹曲する状態に変形している。これに比べて、本発明のものでは、図８（ロ）に示すように、爪取付部４Ａでは殆ど変形せず、爪中心線ＣＬからの左右スカート部４３外側面までの距離は左右同一であり、爪長手方向の中間部４Ｂで左右両側に膨らむ状態で変形しているが、その膨出量は、左右でほぼ同程度である。
この実験例から解るように、従来の係止爪４では、係止爪４の先端部４Ｃ中間部４Ｂが拘束されて保形性の高いものであることから、先端部４Ｃや中間部４Ｂのスカート部４３の変形によって逃がし難い応力が、爪取付部４Ａでスカート部４３に集中的に作用し、座屈変形するに至ったものと考えられる。
これに対して、本発明のものでは、係止爪４の先端部４Ｃや中間部４Ｂに生じる応力を、爪取付部４Ａに大きな影響がでる前に、中間部４Ｂの変形によって逃がすようにしている。
【００２９】
【発明の効果】
請求項１に記載のように構成すると、係止爪が、その係止搬送力を低下させすぎる虞の少ないものでありながら、その爪取付部箇所で座屈などの変形をする前に、爪長手方向の中間部でスカート部を拡げて曲がり易くなり、爪取付部を大きく変形させる虞が少ない。
しかも、その係止爪の変形は、変形が生じるまでの降伏負荷が少ない上に、爪長手方向における係止作用部の曲がり変形と、爪長手方向の中間部におけるスカート部の拡がり変形との複合的な変形となるので、爪取付部での集中的な座屈変形などに比べて、原形からの変形度合いは割合に少なくて済む。
そして、この変形した部分は、前記カバー体の外側に位置するのでものであるから、係止爪の移動に伴ってカバー体の案内部を拡径変形させる虞が少なく、また、係止爪がカバー体の内部に引き込まれる際にも、係止爪の変形度合いが少ないことによって、カバー体の案内部などを損傷する虞が少ない
【００３０】
請求項２に記載のように構成すると、係止爪が、その係止搬送力を低下させすぎる虞の少ないものでありながら、その爪取付部箇所で座屈などの変形をする前に、爪長手方向の中間部でスカート部を拡げて曲がり易くなり、爪取付部を大きく変形させる虞が少ない。
しかも、その係止爪の変形は、変形が生じるまでの降伏負荷が少ない上に、爪長手方向における係止作用部の曲がり変形と、爪長手方向の中間部におけるスカート部の拡がり変形との複合的な変形となるので、爪取付部での集中的な座屈変形などに比べて、原形からの変形度合いは割合に少なくて済む。
したがって、係止爪が他物に接触して二次的な損壊を生じる虞が少ない。
【００３１】
請求項３〜５に記載のように構成すると、係止爪に作用する過大な移動抵抗が爪取付部に及ぶことを、より確実に回避して、爪取付部の変形をより確実に抑制し易い。
【００３２】
請求項６または７に記載のように構成すると、爪取付部側での変形を生じ難くしながら、係止爪全体の保形強度を、リブを用いない場合よりも向上させて、より強力な搬送作用力を有した係止爪を構成することが可能となる。
【図面の簡単な説明】
【図１】引起し装置の全体を示す正面図
【図２】引起し装置の断面図
【図３】係止爪の側面図
【図４】係止爪の断面を表し、（イ）は図３におけるイ−イ線断面、（ロ）は図３におけるロ−ロ線断面図である。
【図５】係止爪の背面図
【図６】係止爪の別の実施の形態を示す側面図
【図７】係止爪の別の実施の形態を示す断面を表し、（イ）は図６におけるイ−イ線断面、（ロ）は図６におけるロ−ロ線断面図である。
【図８】係止爪の変形状態を示す説明図
【図９】係止爪の従来構造を示す側面図と背面図
【符号の説明】
１引起しケース
３無端回動チェーン
４係止爪
４２係止作用部
４３スカート部
４５補強厚肉部
４６第１リブ
４７第２リブ
４Ａ爪取付部
４Ｂ中間部[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a stem / culm engaging / transporting device used in an agricultural work machine such as a combine or a binder, and an improvement of an engaging claw used in the stem / culm engaging / conveying device.
[0002]
[Prior art]
As the stem-and-culm-locking / conveying device for an agricultural work machine and the locking claw thereof, for example, those having a structure shown in FIGS. 9A and 9B are conventionally known.
This conventional structure is an example in which the present invention is applied to a combine raising device. The conventional structure includes a locking claw 4 having one end in a claw longitudinal direction attached to an endless rotating chain 3. It is provided so as to protrude from the raising case 1 that covers the endless rotating chain 3.
The locking claw 4 used in the locking and conveying device is made of a synthetic resin material having a substantially U-shaped cross section, and has a U-shaped internal space in a direction crossing the claw longitudinal direction. The reinforcing ribs 5 are formed in such a manner that the shape retaining strength of the lightweight locking claws 4 can be sufficiently increased.
[0003]
[Problems to be solved by the invention]
According to the above-mentioned prior art, the locking claw is made of a synthetic resin material, is formed in a U-shaped cross section, and employs a reinforcing rib. Although useful in that the strength can be increased, there are the following problems.
In other words, in this type of agricultural working machine, the locking claws of the stem-culm locking / transporting device receive a large movement resistance due to stagnation or clogging during the transportation of a large amount of stem-culm along with the work. However, it is difficult to completely eliminate the possibility that the locking claws enter the soil and receive large movement resistance.
Conventionally, in order to cope with such a situation, the shape of the retaining claw itself is increased to keep the shape up to a certain level of resistance, and if the resistance further increases, it is made of synthetic resin. The locking claw is deformed or damaged by plastic deformation of the locking claw.However, if the deformation or damage does not occur and an abnormal overload occurs, the secondary claw of other related devices is predicted. It was devised to avoid damage.
[0004]
However, the above-mentioned conventional locking claw is intended only to increase the shape retention strength of the synthetic resin locking claw by using reinforcing ribs and to suppress the deformation of the claw with respect to the movement resistance. Therefore, the following new problem has arisen.
That is, since the locking claw has an increased shape-retaining strength, the acting force for deforming the hard-to-deform nail tends to act intensively near the mounting portion of the locking claw. . In addition, the base of the locking claw is configured to be difficult to bend easily in the direction of the movement resistance in order to secure the mounting strength to the rotating chain.
For this reason, the locking claw, which has resisted to the limit, tends to buckle when the limit is exceeded and to be greatly deformed or damaged near the root. In addition, the vicinity of the base of the locking claw moves while being guided by the guide portion of the cover body that covers the rotating chain, and is often configured to be drawn into the cover body when it reaches a predetermined position, When the large deformation or damage as described above occurs near the base of the locking claw, that is, near the attachment portion to the rotating chain, the buckling deformed portion of the locking claw moves along with the movement of the locking claw, and There is a possibility that other members may be damaged with further damage to the nails, for example, by expanding and deforming the guide portion of the nail, or by causing strong contact with a cover body or other members other than the nails to cause biting.
In order to avoid such inconveniences, for example, it is conceivable to make the locking claws more tough and hard to deform, or conversely, to use a soft member that is easily bent and deformed. However, it is necessary to increase the design strength of the entire apparatus, which tends to increase the cost. In the latter case, there is a problem that it is difficult to obtain a sufficient conveying force.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to use a locking claw having a structure that can obtain a required conveying force with a simple structure and that has a low risk of deformation of the locking claw causing damage to a case and other devices, and to use the claw. It is an object of the present invention to provide a pedicle stem locking and conveying device.
[0006]
[Means for Solving the Problems]
The technical means of the stem-and-culm retaining and conveying device of the present invention, which has been adopted to achieve the above object, are as follows.
That is, as described in claim 1, one end side in the claw longitudinal direction is attached to the endless rotating chain, and is provided with a locking claw that raises or conveys the stem while moving in one direction. In a stem / culm locking / conveying device provided with a claw tip side of a claw protruding from a cover body covering the endless rotating chain,
The locking claw has a substantially U-shaped cross-sectional shape, and a locking action portion which is located on a side opposite to the open side of the substantially U-shaped cross-section and which is formed by one side edge along a claw longitudinal direction; It is composed of a synthetic resin material having a skirt portion which is located on both sides and is formed by a side surface along the claw moving direction,
SaidLocking clawIn the skirt part,The shape retention strength of the left and right skirt parts on the claw tip side in the direction away from each other, starting from the middle position of the reference length expressed by the length from the connection point to the endless rotation chain to the claw tip Is set smaller than the shape retaining strength of the skirt portion in the direction away from each other on the claw mounting end side.,
On the claw mounting end side from the intermediate position, a mounting end side intermediate position corresponding to an intermediate position in a claw length direction in a range from a connection point to the endless rotating chain to the intermediate position is a boundary. Also, the shape retention strength of the left and right skirt portions on the nail tip side in the direction away from each other is set smaller than the shape retention strength of the skirt portion on the nail attachment end side in the direction away from each other,
Claw longitudinal direction of this locking clawAt the claw tip side than the mounting end side intermediate part atThe locking claw is attached so that the portion of the skirt portion having a small shape retention strength is located outside the cover body.
[0007]
The technical means for the locking claws used in the above-mentioned stem-culm locking and conveying device are as follows.
That is, as described in claim 2, the locking claw having one end side in the claw longitudinal direction and a claw mounting portion for the driving means and the other end side as the claw tip side is formed in a substantially U-shaped cross section. The locking action portion is formed of a synthetic resin material, and the locking claw is located on a side opposite to the open side of the substantially U-shaped cross section and includes one side edge along a claw longitudinal direction; A skirt portion that is located on both sides and is configured with side surfaces along the claw movement direction,
SaidLocking clawIn the skirt part,The shape retention strength of the left and right skirt parts on the claw tip side in the direction away from each other, starting from the middle position of the reference length expressed by the length from the connection point to the endless rotation chain to the claw tip Is set smaller than the shape retaining strength of the skirt portion in the direction away from each other on the claw mounting end side.,
On the claw mounting end side from the intermediate position, a mounting end side intermediate position corresponding to an intermediate position in a claw length direction in a range from a connection point to the endless rotating chain to the intermediate position is a boundary. Also, the shape retention strength of the left and right skirt portions on the nail tip side in the direction away from each other is smaller than the shape retention strength of the skirt portion on the nail attachment end side in the direction away from each other.It is set.
[0008]
As the locking claw, as described in claim 3,, LockThe width in the claw moving direction of the skirt portion formed by the side surface along the claw moving direction of the claw is set to be larger toward the claw mounting portion side end, and the rate of increase in the width of the claw mounting portion in the claw moving direction is determined by the claw. The width may be set to be larger than the increase rate of the width in the middle portion in the longitudinal direction.
Also,Claim 4As described in the above, the thickness of the skirt portion of the locking claw at the middle portion in the claw longitudinal direction may be formed to be thinner than the claw attachment portion side.
Also,Claim 5As described in the above, the reduction rate of the thickness of the skirt portion at the middle portion of the claw longitudinal direction with respect to the claw mounting portion is made larger than the reduction rate of the thickness of the locking action portion of the middle portion of the claw longitudinal direction with respect to the claw mounting portion. You may.
Also,Claim 6As described in the above, on the inside of the left and right skirt portion, a reinforcing thick portion is formed extending from the claw mounting portion side end near the middle portion in the claw longitudinal direction, and the reinforcing thick portions are separated from each other. It is preferable to form a first rib which is connected at a position where the claw attachment portion is apart from the intermediate portion.
Also,Claim 7As described in above, a second rib having a smaller amount of protrusion than the first rib on the claw attachment portion side may be formed on the inner surface of the locking action portion at the claw tip side of the claw longitudinal intermediate portion. .
[0009]
[Action]
The operation by adopting the configuration according to claim 1 is as follows.
As the locking claw, the direction in which the left and right skirt portions of the claw attachment portion are separated from each other in the skirt portion at the middle portion in the claw longitudinal direction away from the claw attachment portion side than the shape retention strength in the direction away from each other. The locking claw is designed to have a small shape-retaining strength, so this locking claw can be separated from the claw mounting part side in the longitudinal direction of the claw before deforming such as buckling at the claw mounting part. In the part, the skirt tends to be widened and bend easily.
In addition, the deformation of the locking claw is a combination of bending deformation of the locking action portion in the claw longitudinal direction and spreading deformation of the skirt portion in the middle portion in the claw longitudinal direction, in addition to a small yield load until the deformation occurs. Therefore, the degree of deformation from the original shape can be relatively small as compared with intensive buckling deformation at the claw mounting portion.
Further, the skirt portion at the intermediate portion in the claw longitudinal direction of the locking claw is engaged against the movement resistance until strong movement resistance is generated in the locking action portion and the skirt portion starts to spread. It effectively functions as a means for exerting a stopping conveyance action force, and when the skirt portion of the intermediate portion expands, the locking action portion of the intermediate portion is easily bent, so that the movement resistance does not greatly act on the claw mounting portion side. Therefore, the locking and conveying force may be excessively reduced as compared with a configuration in which the entire locking claw including the skirt portion is formed of a mere soft material to prevent the movement resistance from acting largely on the claw mounting portion side. Also less.
Then, even if the middle portion in the claw longitudinal direction is deformed in a state where the locking action portion is bent or the skirt portion has a tendency to spread, the deformed portion is located outside the cover body. In addition, there is little possibility that the guide portion of the cover body is expanded and deformed with the movement of the locking claw. Furthermore, when the locking claw is pulled into the inside of the cover body, the resistance in the direction of returning the expanded portion of the skirt portion in the middle portion in the longitudinal direction of the claw acts only to the extent that it acts. There is little possibility that excessively large movement resistance will occur in the parts and the like.
[0010]
The operation of the configuration according to the second aspect is as follows.
The locking claws are separated from each other in the skirt portion at the middle portion in the claw longitudinal direction away from the claw mounting portion side, than the shape retention strength of the left and right skirt portions of the claw mounting portion portion in the directions separating from each other. Because the shape retention strength is set to be small, before deforming such as buckling at the nail attachment part, expand the skirt part at the middle part of the nail longitudinal direction separated from the nail attachment part side It tends to bend easily.
In addition, the deformation of the locking claw is a combination of bending deformation of the locking action portion in the claw longitudinal direction and spreading deformation of the skirt portion in the middle portion in the claw longitudinal direction, in addition to a small yield load until the deformation occurs. Therefore, the degree of deformation from the original shape can be relatively small as compared with intensive buckling deformation at the claw mounting portion.
Further, the skirt portion at the intermediate portion in the claw longitudinal direction of the locking claw is engaged against the movement resistance until strong movement resistance is generated in the locking action portion and the skirt portion starts to spread. It effectively functions as a means for exerting a stopping conveyance action force. When the skirt portion of the intermediate portion expands, the locking action portion of the intermediate portion is easily bent, so that the movement resistance is prevented from acting largely on the claw mounting portion side. Therefore, the locking and conveying force may be excessively reduced as compared with a configuration in which the entire locking claw including the skirt portion is formed of a mere soft material to prevent the movement resistance from acting largely on the claw mounting portion side. Also less.
[0011]
[0012]
Also,Claim 3As described in the above, the width in the claw movement direction of the skirt portion formed by the side surface along the claw movement direction of the locking claw is set to be larger toward the claw attachment portion side end, and the width in the claw movement direction in the claw attachment portion is set. If the rate of increase of the width is set to be greater than the rate of increase of the width at the middle part in the claw longitudinal direction, the claw mounting is simpler than the claw mounting section side where the width in the claw moving direction is increased. By increasing the difference in the width between the part side and the middle part in the claw longitudinal direction, the difference in bending strength can be increased as much as possible, which also ensures that the deformed portion is more reliably generated on the claw mounting part side. Easy to avoid.
[0013]
Claim 4As described in the above, if the thickness of the skirt portion of the locking claw at the middle portion in the claw longitudinal direction is formed to be thinner than the claw mounting portion side, the expansion of the skirt portion of the locking claw, compared to the claw mounting portion side, This can easily occur at the middle part in the nail longitudinal direction.
[0014]
Claim 5As described in the above, when the reduction ratio of the thickness in the skirt portion of the claw longitudinal direction intermediate portion with respect to the claw attachment portion is larger than the reduction ratio of the wall thickness in the locking action portion of the claw longitudinal direction intermediate portion with respect to the claw attachment portion. The bending deformation of the locking claw at the locking action portion and the expansion at the skirt portion can be more easily caused at the middle portion in the claw longitudinal direction than at the claw mounting portion side.
[0015]
Claim 6As described in the above, on the inside of the left and right skirt portions, a reinforcing thick portion is formed extending from the claw mounting portion side end to a middle portion in the claw longitudinal direction, and the reinforcing thick portions are joined together. By forming the first ribs to be connected at the claw attachment portions, deformation at the claw attachment portions can be more easily avoided.
[0016]
Claim 7As described in the above section, when a second rib having a smaller amount of protrusion than the first rib at a position on the claw attachment portion side is formed on the inner surface of the locking action portion at a position on the tip side of the claw than the middle portion in the claw longitudinal direction, To improve the shape retention strength of the entire locking claw compared to the case where these ribs are not used, and to form a locking claw having a stronger conveying action force, while preventing deformation on the part side. Becomes possible.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a preferred embodiment of the present invention will be described.
[Overall configuration]
The stem and stem locking and conveying device of the present invention, and the locking claw thereof, for example, may be used as a combine raising device, a weeding device, or a locking and transferring device used in a transport system from raising to a feed chain. It can also be applied to binders and various crop harvesters. Here, a case where the present invention is applied to a combine raising device will be described as an embodiment.
[0018]
As shown in FIGS. 1 and 2, the stem-and-culm-locking and conveying device of the present invention has a drive sprocket 21 and a driven sprocket 22 disposed in a raising case 1 as a cover body. , 22 and an endless rotating chain 3, and a large number of locking claws 4, which can swing up and down, are attached to the endless rotating chain 3.
The raising case 1 is bolted in a state in which the upper case portion 11 and the lower case portion 12 are in surface contact with the outer peripheral flange portion 13, and the nails stand up and out on the lower portion and one side of the outer peripheral portion. Opening 15 is formed. The opening 15 has a guide portion 14 formed by bending a part of the outer peripheral edge of the upper case portion 11 and the lower case portion 12 outward to guide the upright movement posture of the locking claw 4. It is constituted by.
The portion along the opening 15 in the raising case 1 contacts the bottom of the guided portion 41 of the locking claw 4 that is moved in one direction (the direction of the arrow in the drawing) by the endless rotating chain 3, A guide 16 having a groove-shaped guide portion for guiding the endless rotating chain 3 is fixed.
Therefore, each locking claw 4 of this stem-culm locking and transporting device moves in an upright position in the range of action guided by the guide body 16 so as to move in a manner of drawing the claw tip trajectory 40 shown in FIG. In the non-operating range deviating therefrom, it is raised and drawn into the case 1 to move.
The structure for raising and lowering the locking claw 4 may be a well-known raising and lowering structure. For example, a rotary cam 23 for raising and guiding is installed on the lateral side surface of the lower driven sprocket 22 to be raised. What is necessary is just to comprise so that it may contact with the lodging guide 24 at the end of a range and switch to an accommodation posture.
[0019]
[Configuration of locking claws]
The locking claw 4 used in the stem / culm locking and conveying device is configured as follows.
As shown in FIGS. 3 to 5, the connecting pin 31 is inserted through one end of the locking claw 4 into the mounting piece 30 of the endless rotating chain 3 so as to rotate around the axis P of the connecting pin 31. It is rotatably mounted.
The locking claw 4 has a substantially U-shaped cross-section, and is located on the side opposite to the open side of the substantially U-shaped cross-section. And left and right skirt portions 43, which are located on both sides thereof and have side surfaces along the claw moving direction, are made of a synthetic resin material such as nylon having a certain degree of elasticity.
[0020]
As shown in FIG. 3, the locking claw 4 extends from an axis P of the connection pin 31 to an intermediate position 4D, which is a position that is about 長 of a reference length L expressed by a length from the axis P to the tip. The locking action portion 42 is formed to have a substantially constant width in the width direction (along the axis P), and the distal end side is gradually tapered.
For the sake of convenience, in the longitudinal direction of the locking claw 4, the range from the intermediate position 4 </ b> D to the tip side is further divided into approximately １／, and the range on the tip side is considered to be the tip portion 4 </ b> C of the locking claw 4, The position closer to the mounting end side from the position displaced about 1/2 from the position 4D to the mounting side to the endless rotating chain 3 is located between the claw mounting portion 4A and the claw mounting portion 4A and the tip portion 4C. The range is defined as an intermediate portion 4B in the nail longitudinal direction.
[0021]
As shown in FIGS. 4 and 5, the locking action portion 42 of the locking claw 4 is formed to have a substantially constant thickness over the entire claw mounting portion 4A, and gradually becomes thinner toward the distal end side. And is partially thick near the curved portion 44 at the distal end.
[0022]
The left and right skirt portions 43 of the locking claw 4 slightly increase the thickness of each skirt portion 43 on the inner surface ranging from a position slightly closer to the claw mounting end side than the intermediate position 4D to the claw mounting end. And the thick reinforcing portions 45 are connected to each other by two first ribs 46 protruding from the locking action portion 42 within a range corresponding to the claw mounting portion 4A. On the other hand, on the tip side of the nail, there are no ribs or other components for connecting the left and right skirt portions 43.
The width of the reinforcing thick portion 45 is sufficient to reinforce the skirt portion 43 of the claw attachment portion 4A so as not to be easily deformed such as buckling even by deformation of the intermediate portion 4B of the locking claw 4. As an example of this embodiment, it is assumed that the reference length L of the locking claw 4 is 128 mm and the thickness of the skirt portion 43 on the claw mounting side from the intermediate position 4D is about 4.5 mm. , About 1-2 mm. The thickness of the skirt 43 is gradually reduced from the intermediate position 4D toward the tip of the claw.
[0023]
As described above, in the skirt portion 43, the nail longitudinal direction intermediate portion 4B portion far from the nail attachment portion 4A than the shape retaining strength of the left and right skirt portions 43 in the left and right skirt portions 43 at the nail attachment portion 4A location. The shape retaining strength of the skirt portion 43 in the direction away from each other is set small, and the portion of the locking claw 4 where the shape retaining strength of the skirt portion 43 is small at the intermediate portion 4B in the claw longitudinal direction is the raising case 1. The locking claw 4 is attached to the endless rotating chain 3 so as to be positioned outside the endless rotating chain 3.
That is, at the intermediate portion 4B in the claw longitudinal direction of the locking claw 4, both the locking action portion 42 and the skirt portion 43 are formed to be thinner than the claw mounting portion 4A. On the 4A side, the deformation of the skirt portion 43 in the opening direction and the closing direction is strongly suppressed by the reinforcement with the reinforcing thick portion 45 and the presence of the first rib 46 connecting the reinforcing thick portions 45 to each other. . Therefore, when a movement resistance acts on the locking claw 4, the deformation of the skirt portion 43 in the opening direction of the intermediate portion 4B in the claw longitudinal direction is allowed, and the bending of the locking action portion 42 in the intermediate portion 4B, The strength is set so that the influence on the claw mounting portion 4A side is small and the deformation at the claw mounting portion 4A is easily regulated with certainty.
[0024]
The locking claw 4 has a width W in the claw moving direction of the skirt portion 43 formed by the side surface along the claw moving direction set to be larger toward the claw mounting portion 4A side end, and the claw in the claw mounting portion 4A. The rate of increase of the width W in the moving direction is set to be greater than the rate of increase of the width in the claw longitudinal direction intermediate portion 4B.
Furthermore, since the reinforcing thick part 45 is formed in the entire range of the nail attaching part 4A in the nail longitudinal direction and a part of the intermediate part 4B in the skirt part 43, the reinforcing thick part 45 is formed. Due to the presence, the reduction ratio of the thickness of the skirt portion 43 of the middle portion 4B in the nail longitudinal direction with respect to the nail attachment portion 4A is smaller than the reduction ratio of the thickness of the locking portion 42 of the middle portion 4B of the nail longitudinal direction with respect to the nail attachment portion 4A. Thus, the ratio of the thickness of the locking action portion 42 and the skirt portion 43 in the claw attachment portion 4A and the intermediate portion 4B is set so as to increase.
[0025]
[Another Example of Embodiment]
6 and 7 show another embodiment of the locking claw 4.
In this example, at the intermediate portion 4B in the claw longitudinal direction of the locking claw 4, three second ribs 47 having a smaller protrusion amount than the first rib 46 of the claw mounting portion 4A are provided.
The amount of protrusion of the second rib 47 is about 1 mm, which is sufficiently smaller than the amount of protrusion of the first rib, about 6 mm. While suppressing the deformation of the claw mounting portion 4A of the claw 4, there is an effect that the overall shape-retaining strength of the locking claw 4 is increased and the conveying force of the locking claw 4 can be increased.
The other structure is the same as that of the above-described embodiment, and will not be described.
[0026]
The reinforcing thick portion 45 described in each of the above-described embodiments of the present invention is not limited to being provided only in a part of the nail moving direction of the skirt portion 43 as described above. It may be formed over the entire direction. Further, the first rib 46 may be provided, or the first rib 46 and the second rib may be provided without providing the thick reinforcing portion 45. Further, both the first rib 46 and the second rib 47 are provided. Only the thick reinforcing portion 45 may be used without using it.
[0027]
The number, thickness, height, and location of the reinforcing thick portion 45, the first rib 46, and the second rib may be arbitrarily set according to the size and required strength of the locking claw 4. .
Further, the mutual dimensional relationship between the claw attachment portion 4A, the intermediate portion 4B, and the distal end portion 4C of the locking claw 4 does not represent only the dimensional relationship as shown in the above-described embodiment, but rather indicates the length of the claw. It is appropriately set according to the place to be installed, or the object to be conveyed, and the point is that when the nail is deformed due to movement resistance exceeding the limit at the time of conveyance, the deformation is large at the base of the nail. In order to avoid swelling and buckling deformation, it is sufficient that the location where the reinforcing thick portion 45, the first rib 46, or the second rib 47 is provided is set as a reference range and is appropriate.
[0028]
[Experimental example]
FIGS. 8 (a) and 8 (b) show experimental results of deformation states of the locking claw 4 of the present invention and the conventional locking claw 4. FIG.
8A shows a deformed state of the conventional locking claw, and FIG. 8B shows a deformed state of the locking claw 4 of the present invention. It is a view of the deformed state from the side.
In this experiment, as shown in FIG. 9 showing a conventional example, an iron round bar 6 was positioned at a position slightly closer to the distal end side than its intermediate position 4D in the longitudinal direction, facing the locking action portion 42 of the locking claw 4. , And the locking claw 4 was completely fixed at the claw mounting end, and the iron round bar 6 was moved in the claw moving direction in the same manner as the stem.
In the conventional device shown in FIG. 8A, the shape of the tip portion and the middle portion of the locking claw 4 is not so large, but the buckling is greatly deformed at the claw mounting portion 4A. The amount of deformation that partially bulges leftward from the center line CL is particularly large, and the right side is rather deformed into a concave shape. On the other hand, in the case of the present invention, as shown in FIG. 8B, the nail attachment portion 4A hardly deforms, and the distance from the nail center line CL to the outer surfaces of the left and right skirt portions 43 is the same for the left and right sides. There is a deformation in the middle part 4B in the claw longitudinal direction in a state of bulging to the left and right sides, but the bulging amount is substantially the same in the left and right.
As can be seen from this experimental example, in the conventional locking claw 4, the tip 4 C and the intermediate portion 4 B of the locking claw 4 are restrained and have a high shape-retaining property. It is considered that the stress which is hard to be released due to the deformation of the skirt portion 43 acts intensively on the skirt portion 43 by the claw attachment portion 4A, and the buckling deformation occurs.
On the other hand, in the case of the present invention, the stress generated at the distal end portion 4C and the intermediate portion 4B of the locking claw 4 is released by the deformation of the intermediate portion 4B before greatly affecting the claw mounting portion 4A. I have.
[0029]
【The invention's effect】
With the configuration as described in claim 1, the locking claw has a small risk of excessively lowering the locking and conveying force, but before the locking claw is deformed such as buckling at the claw mounting portion. The skirt portion is widened at the middle portion in the longitudinal direction, so that the skirt portion is easily bent, and there is little possibility that the nail attachment portion is largely deformed.
In addition, the deformation of the locking claw is a combination of bending deformation of the locking action portion in the claw longitudinal direction and spreading deformation of the skirt portion in the middle portion in the claw longitudinal direction, in addition to a small yield load until the deformation occurs. Therefore, the degree of deformation from the original shape can be relatively small as compared with intensive buckling deformation at the claw mounting portion.
And since this deformed part is located outside the cover body, there is little possibility that the guide portion of the cover body is deformed to a large diameter with the movement of the locking claw. Even when the cover is drawn into the inside of the cover, the guide portion of the cover is less likely to be damaged due to a small degree of deformation of the locking claw.
[0030]
According to the configuration described in claim 2, the locking claw has a small risk of excessively lowering the locking and conveying force, but before the locking claw is deformed such as buckling at the claw mounting portion. The skirt portion is widened at the middle portion in the longitudinal direction, so that the skirt portion is easily bent, and there is little possibility that the nail attachment portion is largely deformed.
In addition, the deformation of the locking claw is a combination of bending deformation of the locking action portion in the claw longitudinal direction and spreading deformation of the skirt portion in the middle portion in the claw longitudinal direction, in addition to a small yield load until the deformation occurs. Therefore, the degree of deformation from the original shape can be relatively small as compared with intensive buckling deformation at the claw mounting portion.
Therefore, there is little possibility that the locking claws come into contact with other objects to cause secondary damage.
[0031]
Claim3-5With such a configuration, it is possible to more reliably prevent the excessive movement resistance acting on the locking claw from reaching the claw mounting portion, and to more reliably suppress the deformation of the claw mounting portion.
[0032]
Claim 6 or 7With the configuration as described, the deformation on the claw mounting portion side is hardly generated, and the shape retaining strength of the entire locking claw is improved as compared with the case where the rib is not used, so that a stronger conveying action force was obtained. It is possible to form a locking claw.
[Brief description of the drawings]
FIG. 1 is a front view showing the entire raising device.
FIG. 2 is a sectional view of the raising device.
FIG. 3 is a side view of a locking claw.
4A and 4B are cross-sectional views of a locking claw, wherein FIG. 4A is a cross-sectional view taken along a line II in FIG. 3, and FIG.
FIG. 5 is a rear view of a locking claw.
FIG. 6 is a side view showing another embodiment of the locking claw.
7A and 7B are cross-sectional views illustrating another embodiment of the locking claw, in which FIG. 7A is a cross-sectional view taken along a line II in FIG. 6, and FIG.
FIG. 8 is an explanatory view showing a deformed state of a locking claw.
FIG. 9 is a side view and a rear view showing a conventional structure of a locking claw.
[Explanation of symbols]
1 Raised case
3 Endless rotating chain
4 Locking claws
42 Locking action part
43 Skirt
45 Reinforced thick part
46 1st rib
47 2nd rib
4A Claw mounting part
4B middle part

Claims

One end in the claw longitudinal direction is attached to the endless rotating chain, and a locking claw is provided for raising or conveying the stem while moving in one direction, and the claw tip side of the locking claw is connected to the endless rotating chain. A stem-and-culm locking and conveying device provided in a state of protruding from a cover body covering the
The locking claw has a substantially U-shaped cross-sectional shape, and a locking action portion which is located on a side opposite to the open side of the substantially U-shaped cross-section and which is formed by one side edge along a claw longitudinal direction; It is composed of a synthetic resin material having a skirt portion which is located on both sides and is formed by a side surface along the claw moving direction,
In the skirt portion of the locking claw, at the middle position of the reference length represented by the length from the connection point to the endless rotating chain to the claw tip, as a boundary, the left and right skirt portions on the claw tip side than this The shape retention strength in the direction away from each other is set smaller than the shape retention strength in the direction away from the skirt portion on the claw mounting end side ,
On the claw mounting end side from the intermediate position, a mounting end side intermediate position corresponding to an intermediate position in a claw length direction in a range from a connection point to the endless rotating chain to the intermediate position is a boundary. Also, the shape retention strength of the left and right skirt portions on the nail tip side in the direction away from each other is set smaller than the shape retention strength of the skirt portion on the nail attachment end side in the direction away from each other,
A stem to which the locking claw is attached such that a portion of the skirt portion on the tip end side of the locking claw in the claw longitudinal direction on the tip end side of the claw that is smaller in shape retention strength is located outside the cover body. A culm-locking transport device.

A locking claw having one end side in the claw longitudinal direction and a claw mounting portion for the driving means and the other end side as a claw tip side is made of a synthetic resin material having a substantially U-shaped cross section,
The locking claw is located on a side opposite to the open side of the substantially U-shaped cross-section, and is configured with one side edge along the claw longitudinal direction; And a skirt part composed of side faces along
In the skirt portion of the locking claw, at the middle position of the reference length represented by the length from the connection point to the endless rotating chain to the claw tip, as a boundary, the left and right skirt portions on the claw tip side than this The shape retention strength in the direction away from each other is set smaller than the shape retention strength in the direction away from the skirt portion on the claw mounting end side ,
On the claw mounting end side from the intermediate position, a mounting end side intermediate position corresponding to an intermediate position in a claw length direction in a range from a connection point to the endless rotating chain to the intermediate position is a boundary. A locking claw wherein the shape retention strength of the left and right skirt portions in the direction away from each other at the tip end side of the pawl is set smaller than the shape retention strength of the skirt portion in the direction away from each other on the nail attachment end side .

The width in the claw movement direction of the skirt portion formed by the side surface along the claw movement direction of the locking claw is set to be larger toward the claw attachment portion side end, and the rate of increase in the width of the claw attachment portion in the claw movement direction is reduced. The locking claw according to claim 2 , wherein the locking claw is set to be larger than an increasing rate of the width at a middle portion in a claw longitudinal direction.

The locking claw according to claim 2 or 3 , wherein the thickness of the locking claw at a middle portion in the claw longitudinal direction of the skirt portion is formed to be thinner than the claw mounting portion side.

The reduction ratio of the thickness of the skirt portion at the middle portion in the nail longitudinal direction with respect to the nail attachment portion is greater than the reduction ratio of the thickness of the locking portion at the middle portion of the nail longitudinal direction with respect to the nail attachment portion . 3. The locking claw according to 3 or 4 .

Inside the left and right skirt portions, a thick reinforcing portion is formed extending from the nail mounting portion side end to an intermediate portion in the nail longitudinal direction, and the reinforcing thick portions are connected to each other by the nail mounting portion. 6. The locking claw according to claim 2, wherein the first rib is connected by the first rib.

7. The latch according to claim 6, wherein a second rib having a smaller amount of protrusion than a first rib at a location closer to the claw mounting portion is formed on the inner surface of the locking action portion at a location closer to the tip of the claw than the middle portion in the longitudinal direction of the claw. nail.