JP4445112B2 - Wire winding device for forming transmission belts - Google Patents

Wire winding device for forming transmission belts Download PDF

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Publication number
JP4445112B2
JP4445112B2 JP2000278131A JP2000278131A JP4445112B2 JP 4445112 B2 JP4445112 B2 JP 4445112B2 JP 2000278131 A JP2000278131 A JP 2000278131A JP 2000278131 A JP2000278131 A JP 2000278131A JP 4445112 B2 JP4445112 B2 JP 4445112B2
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Japan
Prior art keywords
core wire
wound
outer periphery
reinforcing material
core
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JP2000278131A
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Japanese (ja)
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JP2002086581A (en
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進 上総
忠 小玉
薫 土井
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Mitsuboshi Belting Ltd
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Mitsuboshi Belting Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、歯付ベルトなど、心線がベルト長手方向に沿って埋入された伝動ベルトを成形する際に、成形用の金型に心線を巻き付けるために用いられる装置に関するものである。
【0002】
【従来の技術】
歯付ベルトなどの伝動ベルトを製造するにあたっては、例えば次のようにして行なわれている。すなわち図3(a)に示すような、外周に歯部成形用の凹溝11を軸方向と並行に多数本設けて形成した円筒状の金型2を用い、まずこの金型2の外周に帆布などのシート材を筒状にした補強材1を被せ、次に金型2に被せた補強材1の外周に心線4をスパイラル状に巻き付ける。この後、心線4の上から補強材1の外周に未加硫のゴムシート12を巻き付け、これを加熱・加圧して加硫することによって、円筒状のスリーブを成形する。そしてこのスリーブを輪切りするように切断することによって、図3(b)に示すような、片面に補強材1で表面が補強された歯部13が所定ピッチで形成され、複数本の心線4がベルト長手方向に埋入された伝動ベルトTを得ることができるものである。
【0003】
ここで、上記のように金型2に被せた補強材1の外周に心線4をスパイラル状に巻き付けるために、特公平6−92133号公報などで提供されているように、タッチプーリ3が使用されている。タッチプーリ3は円柱状に形成されるものであって、軸15を中心にして回転自在にしてある。このタッチプーリ3は回転駆動される金型2の回転軸16に軸15が平行になるように金型2の外周部に配置されるものであり、金型2の軸方向と平行に移動駆動されるようにしてある。
【0004】
図4及び図5は従来のタッチプーリ3の一例を示すものであり、その軸方向の一方の端部は巻付け心線押さえ部5として、軸方向の他の部分は巻済み心線押さえ部6としてそれぞれ形成してある。巻付け心線押さえ部5の外周には心線ガイド溝17が凹設してある。尚、図のものは、S撚りとZ撚りの一対の心線4を同時に巻き付ける2条巻きに用いるために2本の心線ガイド溝17が凹設してあるが、1条巻の場合には1本の心線ガイド溝17を凹設したタッチプーリ3を用いる。そして従来のタッチプーリ3では、巻付け心線押さえ部5の半径(心線ガイド溝17の溝底部での半径)r1と、巻済み心線押さえ部6の半径r1とは、等しい寸法に形成してある。
【0005】
このようなタッチプーリ3を用いて、金型2に被せた補強材1の外周に心線4をスパイラル状に巻き付けるにあたっては、金型2に被せた補強材1の外周に供給される心線4を、タッチプーリ3の巻付け心線押さえ部5の心線ガイド溝17に嵌合させてガイドしながら、金型2を図5の矢印のように回転駆動することによって、心線ガイド溝17でガイドして位置決めした状態で補強材1の外周に心線4を巻き付けることができるものであり、同時に図4の矢印のようにタッチプーリ3を金型2と平行に移動させることによって、心線ガイド溝17で心線1をガイドする位置を移動させ、スパイラル状に巻き付けることができるものである。
【0006】
ここで、タッチプーリ3を金型2に被せた補強材1の外周に直接接触させず浮かせた状態で心線4の巻き付けを行なう方法もあるが、この方法では巻き付けられた心線4の並びが悪くなり、得られた伝動ベルトTに埋入されている心線4の本数にばらつきが生じて、伝動ベルトTの強度のばらつきが大きくなると共に、心線4同士が接触しているとベルト走行中に心線4間にストレスが生じて切断されるおそれがある。
【0007】
このために、図4や図5に示すように、タッチプーリ3を金型2に被せた補強材1に押さえ付けた状態で、心線4の巻き付けを行なうようにしている。図4及び図5において、符号4aは補強材1の外周にこれから巻き付けようとする心線4を示し、符号4bは補強材1の外周に既に巻き付けた巻付け済みの心線4を示すものであり、巻き付けようとする心線4aは巻付け心線押さえ部5の心線ガイド溝17で押さえ付けられて補強材1の外周に巻き付けられ、また補強材1の外周に巻付け済みの心線4bは巻済み心線押さえ部6で押さえられている。このように巻き付けようとする心線4aと巻付け済みの心線4bがそれぞれタッチプーリ3で押さえ付けられた状態で巻き付けが行なわれるので、補強材1の外周での心線4の並びが良くなるのである。
【0008】
【発明が解決しようとする課題】
上記のようにタッチプーリ3を金型2に被せた補強材1に押さえ付けることによって、並び良く心線4をスパイラルに巻き付けることができるが、この反面、タッチプーリ3による押圧力の作用で金型2に被せた補強材1にずれによるネジレが発生し易くなる。補強材1は帆布等を筒状にして付き合わせた端部同士を縫い合わせてあり、この縫い目14は図3(b)に示すように歯部13の頂部に位置するように伝動ベルトTを製造する必要があり、このためには縫い目14が凹溝11の位置にくるように補強材1を金型2に被せて、成形を行なう必要があるが、心線4を巻き付ける際に補強材1にずれが生じると、補強材1の縫い目14が凹溝11の位置からずれるおそれがあり、縫い目14が歯部13の頂部からずれて歯部13間の谷部などの位置に縫い目14が存在して、強度の上で問題がある伝動ベルトTが製造されるおそれがあるのである。
【0009】
ここで、心線4を巻き付ける際に補強材1にずれによるネジレが発生する原理を図5に基づいて説明する。
【0010】
タッチプーリ3は自身では回転駆動されないものであり、図4や図5に示すように、補強材1の外周に既に巻き付けられている巻付け済みの心線4bに巻済み心線押さえ部6が圧接していることによって、金型2の回転駆動に従動してタッチプーリ3は図5の矢印のように回転されるものであり、補強材1の外周にこれから巻き付けようとする心線4aは角度θの範囲で巻付け心線押さえ部5の心線ガイド溝17に巻き掛けられている。そしてタッチプーリ3の外周のうち金型2に最も近い個所に接する心線4a,4bの表面上の点をA0とし、これから巻き付けようとする心線4aがタッチプーリ3の巻付け心線押さえ部5の外周に角度θで巻き掛けられている範囲である円弧A00をとり、さらに円弧A00=円弧A00となるように点C0を巻付け済み心線4bの外側の表面上にプロットする。またタッチプーリ3の軸15と点A0を結ぶ直線の延長線とこれから巻き付けようとする心線4aのピッチラインpとの交点と、金型2の回転軸16と点A0を結ぶ直線と巻付け済みの心線4bのピッチラインpとの交点は図5において一致するので、それぞれ点A1としてプロットし、さらにタッチプーリ3の軸15と点B0を結ぶ直線の延長線とこれから巻き付けようとする心線4aのピッチラインpとの交点を点B1としてプロットすると共に、金型2の回転軸16と点C0を結ぶ直線と巻付け済みの心線4bのピッチラインpとの交点をC1としてプロットする。尚、心線4のピッチラインpは心線4のほぼ中心にある。
【0011】
タッチプーリ3の巻付け心線押さえ部5の半径r1と巻済み心線押さえ部6の半径r1は等しいので、タッチプーリ3と心線4の間で滑りがなければ、金型2の回転駆動に伴って回転される巻付け済み心線4bの外側表面の速度とタッチプーリ3の巻付け心線押さえ部5の外周表面の速度は等しくなり、従って巻付け心線押さえ部5に接するこれから巻き付けようとする心線4aの内側表面の速度と巻付け済み心線4bの外側表面の速度は等しくなる。すなわち、[巻き付けようとする心線4aの内側表面の送り速度:巻付け済み心線4bの外側表面の送り速度=円弧A00:円弧A00]であり、円弧A00=円弧A00である。
【0012】
ここで、巻き付けようとする心線4aの送り速度と巻付け済み心線4bの送り速度を、心線4の真の長さであるピッチラインpについて比較をすると、[巻き付けようとする心線4aの送り速度:巻付け済み心線4bの送り速度=円弧A11:円弧A11]である。そして心線4の厚み(直径)をt、金型2に補強材1の厚みを加えた金型2の中心の回転軸16から補強材1の外周までの半径をr2とすると、円弧A11/円弧A00=(r1+0.5t)/r1であり、円弧A11/円弧A00=(r2+0.5t)/(r2+t)である。上記のように円弧A00=円弧A00であるから、[巻き付けようとする心線4aの送り速度:巻付け済み心線4bの送り速度=円弧A11:円弧A11=(r1+0.5t)/r1:(r2+0.5t)/(r2+t)]の関係になる。一般にr2はr1より大であるので、(r1+0.5t)/r1>(r2+0.5t)/(r2+t)であり、従って円弧A11>円弧A11である。よって、巻き付けようとする心線4aの送り速度は巻付け済み心線4bの送り速度より常に速くなる。
【0013】
このように、巻き付けようとする心線4aの送り速度が巻付け済み心線4bの送り速度より速いと、送り込まれる心線4aはその長さが送り込まれた心線4bより大きいため、巻き付けようとする心線4aは送り終わった方向、すなわち金型2の回転方向へ逃げ、この結果、金型2の回転方向に補強材1がずれてネジレが発生するのである。
【0014】
本発明は上記の点に鑑みてなされたものであり、タッチプーリで押さえ付けながら心線を巻き付けるにあたって、補強材がずれてネジレるようなことなく、心線を補強材の外周に巻き付けることができる伝動ベルト成形用心線巻付け装置を提供することを目的とするものである。
【0015】
【課題を解決するための手段】
本発明は、補強材1を外周に被せた伝動ベルト成形用の金型2と、金型2に被せた補強材1の外周に接して回転自在で且つ金型2の軸方向に沿って移動駆動されるタッチプーリ3とを備えて成り、金型2に被せた補強材1の外周に供給される心線4をタッチプーリ3の外周面で押さえながら金型2を回転駆動させることによって、心線4を補強材1の外周にスパイラル状に巻き付けるようにした伝動ベルト成形用心線巻付け装置において、タッチプーリ3に、補強材1の外周に供給されて巻き付けられる心線4を押さえる巻付け心線押さえ部5と、補強材1の外周に巻き付け済みの心線4を押さえる巻済み心線押さえ部6を形成すると共に、巻済み心線押さえ部6の半径r3を巻付け心線押さえ部5の半径r1よりも大きく形成して成ることを特徴とするものである。
【0016】
また請求項2の発明は、タッチプーリ3の巻付け心線押さえ部5の半径をr1、巻済み心線押え部6の半径をr3、補強材1の厚みも含めた金型の半径をr2、心線4の厚みをtとすると、巻済み心線押え部6の半径r3と巻付け心線押さえ部5の半径r1の差dを、
d=A×(0.5t(r1+r2)/r2
(ただし、Aは0.1〜0.7の係数)
に設定することを特徴とするものである。
【0017】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
【0018】
図1及び図2は本発明の実施の形態の一例を示すものであり、タッチプーリ3は円柱状(あるいは円筒状)に形成されるものであって、軸15を中心にして回転自在にしてある。またタッチプーリ3は軸方向の一方の端部を巻付け心線押さえ部5として、軸方向の他の部分を巻済み心線押さえ部6として一体に形成してあり、巻付け心線押さえ部5の外周には心線ガイド溝17が凹設してある。そしてこのタッチプーリ3において、巻付け心線押さえ部5の半径(心線ガイド溝17の溝底部での半径)r1よりも、巻済み心線押さえ部6の半径r3を大きい寸法に形成してある。
【0019】
また金型2は既述のように、外周に歯部成形用の凹溝11を軸方向と並行に多数本設けて形成した円筒体(あるいは円柱体)で形成されるものであり、回転軸16を中心にして回転駆動されるようになっている。タッチプーリ3はこの金型2の外周部に軸15,16が平行になるように配置されるものであり、金型2の軸方向と平行な方向に移動駆動されるようにしてある。
【0020】
そしてこの金型2の外周には、帆布などのシート材を縫い合わせて筒状にした補強材1が被せられるものであり、金型2に被せたこの補強材1の外周に心線4をスパイラル状に巻き付けるにあたっては、心線4を補強材1の外周に供給し、タッチプーリ3の巻付け心線押さえ部5の心線ガイド溝17で心線4をガイドしながら、金型2を図2の矢印方向のように回転駆動すると共にタッチプーリ3を金型2に対して図1の矢印のように平行に移動させることによって行なうことができる。また、タッチプーリ3には心線4を金型2に被せた補強材1に押さえ付ける押圧力が与えられており、これから巻き付けようとする心線4aは巻付け心線押さえ部5の心線ガイド溝17で押さえ付けられて補強材1の外周に巻き付けられると同時に、補強材1の外周に巻付け済みの心線4bは巻済み心線押さえ部6で押さえられているので、補強材1の外周での心線4の並びを良好なものとすることができる。
【0021】
そして従来例の図5において説明したように、タッチプーリ3で押さえ付けながら金型2を回転駆動して心線4を補強材1の外周に巻き付ける際に、これから巻き付けようとする心線4aの送り速度が、巻付け済み心線4bの送り速度より速いと、巻き付けられる心線4aに補強材1が部分的に引かれて移動し、金型2の回転方向に補強材1がずれてネジレが発生する。従って、これから巻き付けようとする心線4aの送り速度と、巻付け済み心線4bの送り速度が等しくなれば、送り込まれる心線4aにの長さと送り込まれた心線4bの長さは等しくなり、巻き付けられる心線4aに補強材1が部分的に引かれるようなことがなくなって、補強材1がずれてネジレることを防止することができる。
【0022】
本発明ではタッチプーリ3の巻付け心線押さえ部5の半径r1よりも、巻済み心線押さえ部6の半径r3を大きい寸法に形成することによって、巻付け心線押さえ部5の外周と巻済み心線押さえ部6の外周での周速度に差を付け、巻付け心線押さえ部5で押さえながらこれから巻き付けようとする心線4aの送り速度と、巻済み心線押さえ部6で押さえられている巻付け済み心線4bの送り速度を等しくすることができるようにしたものであり、この原理を図2に基づいて説明する。
【0023】
図2においてA0,B0,C0,A1,B1,C1はそれぞれ図5のものと同じである(ただし、A0は巻き付けようとする心線4aの表面上の点、A1は巻き付けようとする心線4aのピッチラインp上の点である)。また、巻済み心線押え部6の半径r3は巻付け心線押え部5の半径r1よりも大きく形成されているので、巻済み心線押え部6によって補強材1及び巻付け済み心線4bは圧縮されており、巻済み心線押さえ部6の外周のうち金型2に最も近い個所に接する巻済み心線4bの外側表面上の点をA3、金型2の回転軸16と点A3を結ぶ直線と巻付け済み心線4bのピッチラインp上の点をA5としてプロットする。そして図5の場合と同様に円弧A00=円弧A00であり、巻付け済み心線4bは圧縮されているが、実質的に円弧A00=円弧A30として差し支えない。そして円弧A30=円弧A33となる点B3を巻済み心線押さえ部6の外周表面上にプロットし、さらにタッチプーリ3の中心である軸15とB3を結ぶ直線が巻き付けようとする心線4aのピッチラインpと交わる点B4をプロットする。
【0024】
ここで、既述のようにタッチプーリ3は自身では回転駆動されず、補強材1の外周に既に巻き付けられている巻付け済みの心線4bに巻済み心線押さえ部6が圧接していることによって、金型2の回転駆動に従動してタッチプーリ3は図2の矢印のように回転されるものである。そして円弧A30=円弧A33であるから、金型2が図2の矢印のように回転駆動されて巻付け済み心線4bが送られ、巻付け済み心線4bの外周上の点C0が図2の点A3に達するときには、巻付け心線押さえ部6の外周上の点B3が図2の点A3に達するようにタッチプーリ3は回転されることになり、タッチプーリ3のこの回転に伴って巻付け心線押さえ部5によってこれから巻き付けようとする心線4aが送られる。従ってこのときの、巻き付けようとする心線4aの送り速度と、巻付け済み心線4bの送り速度を、心線4の真の長さであるピッチラインpについて比較をすると、[巻き付けようとする心線4aの送り速度:巻付け済み心線4bの送り速度=円弧A14:円弧A51]の関係が成立する。図2から明らかなように、円弧A14<円弧A11であり、実質的に円弧A51=円弧A11であるので、従来の図5の[巻き付けようとする心線4aの送り速度:巻付け済み心線4bの送り速度=円弧A11:円弧A11]の関係の場合よりも、巻き付けようとする心線4aの送り速度を遅くすることができる。従って、従来のような巻き付けようとする心線4aの送り速度が巻付け済み心線4bの送り速度より速くなる状態を解消し、巻き付けようとする心線4aの送り速度と巻付け済み心線4bの送り速度ができるだけ等しくなるようにすることが可能になり、補強材1がずれてネジレることを防止することが可能になるものである。
【0025】
次に、補強材1がずれてネジレることを防止するために必要な、タッチプーリ3における巻付け心線押さえ部5の半径r1と巻済み心線押さえ部6の半径r3の差dを、図2に基づいて求める。すなわち、上記の[巻き付けようとする心線4aの送り速度:巻付け済み心線4bの送り速度=円弧A14:円弧A51]の関係から、円弧A14=円弧A51であれば、巻き付けようとする心線4aの速度と巻付け済み心線4bの速度は等しくなり、補強材1がずれてネジレることを防止することができる。従って、円弧A14=円弧A51にするために必要な条件として、巻付け心線押さえ部5の半径r1と巻済み心線押さえ部6の半径r3の差dを求めればよい。
【0026】
しかして図2において、円弧A51/円弧A30=(r2+0.5t)/(r2+t)である(巻付け済み心線4bは圧縮されているが、両辺は実質的にイコールとして差し支えない)。また円弧A14/円弧A33=(r1+0.5t)/r3=(r1+0.5t)/(r1+d)である。円弧A30=円弧A33であるから、円弧A14:円弧A51=(r1+0.5t)/(r1+d):(r2+0.5t)/(r2+t)となる。そして円弧A14=円弧A51を成立させる条件は、(r1+0.5t)/(r1+d)=(r2+0.5t)/(r2+t)である。この等式を展開すると、d=0.5t(r1+r2+t)/(r2+0.5t)となる。tはr1やr2よりも十分に小さいのでr1+r2+t≒r1+r2、r2+0.5t≒r2とすることができる。従って、d=0.5t(r1+r2)/r2を得ることができる。
【0027】
このように、補強材1がずれてネジレることを防止するために必要な、タッチプーリ3における巻付け心線押さえ部5の半径r1と巻済み心線押さえ部6の半径r3の差dは、
d=0.5t(r1+r2)/r2 …(1)
として求めることができる。しかし実際には、心線4とタッチプーリ3との間の滑り、補強材1の圧縮変形による心線4の沈みなどが複雑に影響し、さらに補強材1がタッチプーリ3による押圧力でタクレて金型2の回転と逆方向にずれるタクレの現象があるので、理論的に得られる上記の式(1)に係数をかけて補正する必要がある。タクレの現象は、図6に示すように、金型2の外周に被せた補強材1にこれから巻き付けようとする心線4aを介してタッチプーリ3の押圧力が作用すると、この押圧力で補強材1が金型2の表面から部分的に浮いて金型2の回転方向と反対方向に押されてずれることによって生じるものであり、心線4を補強材1の外周に巻き付ける際に発生するずれによって補強材1が金型2の回転方向にベジレるのとは反対向きのずれである。従って、上記の式(1)に1以下の係数Aをかけて得られる
d=A×(0.5t(r1+r2)/r2) …(2)
が実用的に採用されるものである。この係数Aは補強材1や心線4の材質等に応じて異なるが、実機による試験から経験的に0.1〜0.7であると求められている。
【0028】
ここで、歯数106、歯形MY、ベルト幅25mmの歯付ベルトを製造するにあたって、r1=70mm、r2=135mm、t=1.20mmであるとき、これらの数値を代入して式(1)からdを求めると、d=0.9mmとなるが、これに係数A=0.1〜0.7をかけると、d=0.09mm〜0.63mmとなる。従って、巻付け心線押さえ部5の半径r1が70mmのタッチプーリ3の場合、巻済み心線押さえ部の半径r3を70.09mm〜70.63mmの間に形成することによって、補強材1がずれてネジレるようなことを確実に防止しながら、心線4の巻き付けを行なうことができるものである。
【0029】
尚、本発明では上記のようにタッチプーリ3の巻済み心線押さえ部6の半径r3を巻付け心線押さえ部5の半径r1より大きくなるように形成しているため、巻付け済み心線4bに対する巻済み心線押さえ部6の押圧力が弱いと、巻付け心線押さえ部5が巻き付けようとする心線4aから浮いて、補強材1の外周に巻き付けられた心線4の並びが悪くなるおそれがある。このために、タッチプーリ3に付加的な押圧力を与え、巻付け済み心線4bや補強材1を巻済み心線押さえ部6で圧縮させるようにして、巻付け心線押さえ部5で巻き付けようとする心線4aを押さえ付けることができるようにする必要がある。このようにタッチプーリ3を強く押圧させるようにしても、金属材料で形成されるタッチプーリ3において巻付け心線押さえ部5の半径r1と巻済み心線押さえ部6の半径r3の比率は変わらないので、補強材1がずれてネジレることを防ぐ効果に影響はない。また心線4や補強材1は繊維材料で形成されるので、タッチプーリ3で一時的に押圧されて圧縮変形しても、伝動ベルトTの性能には何ら問題は生じない。
【0030】
【発明の効果】
上記のように本発明は、補強材を外周に被せた伝動ベルト成形用の金型と、金型に被せた補強材の外周に接して回転自在で且つ金型の軸方向に沿って移動駆動されるタッチプーリとを備えて成り、金型に被せた補強材の外周に供給される心線をタッチプーリの外周面で押さえながら金型を回転駆動させることによって、心線を補強材の外周にスパイラル状に巻き付けるようにした伝動ベルト成形用心線巻付け装置において、タッチプーリに、補強材の外周に供給されて巻き付けられる心線を押さえる巻付け心線押さえ部と、補強材の外周に巻き付け済みの心線を押さえる巻済み心線押さえ部を形成するようにしたので、これから巻き付けようとする心線と巻付け済みの心線をそれぞれ押さえた状態で心線を巻き付けることができ、補強材の外周での心線の並びを良好なものとすることができるものである。しかも巻済み心線押さえ部の半径を巻付け心線押さえ部の半径よりも大きく形成するようにしたので、巻付け心線押さえ部の外周と巻済み心線押さえ部の外周での周速度に差を付け、巻付け心線押さえ部で押さえながらこれから巻き付けようとする心線の送り速度と、巻済み心線押さえ部で押さえられている巻付け済み心線の送り速度が等しくなるようにすることができ、巻き付けようとする心線の速度が巻付け済み心線の速度より速いことによって生じる補強材のずれによるネジレを防止しながら、心線を補強材の外周に巻き付けることができるものである。
【図面の簡単な説明】
【図1】本発明の実施の形態の一例を示す一部の正面図である。
【図2】同上の一部の側面図である。
【図3】(a)は伝動ベルトの製造の工程の一例を示す側面断面図、(b)は伝動ベルトの一部を示す拡大した斜視図である。
【図4】従来例を示す一部の正面図である。
【図5】同上の一部の側面図である。
【図6】タクレの現象を示す一部の側面図である。
【符号の説明】
1 補強材
2 金型
3 タッチプーリ
4 心線
5 巻付け心線押さえ部
6 巻済み心線押さえ部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus used for winding a core wire around a molding die when a power transmission belt having a core wire embedded in the longitudinal direction of the belt, such as a toothed belt, is formed.
[0002]
[Prior art]
In manufacturing a transmission belt such as a toothed belt, for example, it is performed as follows. That is, as shown in FIG. 3 (a), a cylindrical mold 2 formed by providing a large number of concave grooves 11 for forming tooth portions on the outer periphery in parallel with the axial direction is used. A reinforcing material 1 made of a sheet material such as canvas is covered with a tubular material, and then a core wire 4 is spirally wound around the outer periphery of the reinforcing material 1 covered with a mold 2. Thereafter, an unvulcanized rubber sheet 12 is wound around the outer periphery of the reinforcing material 1 from above the core wire 4, and this is heated and pressurized to vulcanize to form a cylindrical sleeve. Then, by cutting the sleeve so as to be cut in a circle, tooth portions 13 whose surfaces are reinforced with the reinforcing material 1 are formed at a predetermined pitch as shown in FIG. 3B, and a plurality of core wires 4 are formed. The transmission belt T embedded in the longitudinal direction of the belt can be obtained.
[0003]
Here, in order to wrap the core wire 4 in a spiral shape around the outer periphery of the reinforcing material 1 placed on the mold 2 as described above, the touch pulley 3 is used as provided in Japanese Patent Publication No. 6-92133. Has been. The touch pulley 3 is formed in a columnar shape, and is rotatable about the shaft 15. The touch pulley 3 is arranged on the outer periphery of the mold 2 so that the shaft 15 is parallel to the rotation shaft 16 of the mold 2 to be rotationally driven, and is moved and driven in parallel with the axial direction of the mold 2. It is made to do.
[0004]
4 and 5 show an example of a conventional touch pulley 3. One end in the axial direction is a wound core pressing part 5, and the other axial part is a wound core pressing part 6. FIG. Respectively. A core wire guide groove 17 is recessed in the outer periphery of the winding core wire pressing portion 5. In the figure, the two core wire guide grooves 17 are recessed to be used for two-strand winding in which a pair of S-strand and Z-strand core wires 4 are wound simultaneously. Uses the touch pulley 3 in which one core guide groove 17 is recessed. Then, in the conventional Tatchipuri 3, the r 1 (radius at the groove bottom portion of the core wire guide grooves 17) wound cord pressing portion 5 of the radius, and the radius r 1 of the winding already cord pressing portion 6, equal size It is formed.
[0005]
When the core wire 4 is spirally wound around the outer periphery of the reinforcing material 1 placed on the mold 2 using such a touch pulley 3, the core wire 4 supplied to the outer periphery of the reinforcing material 1 placed on the die 2 is used. The core 2 is rotated and driven as indicated by the arrow in FIG. 5 while being guided by being fitted into the core guide groove 17 of the winding core holder 5 of the touch pulley 3. The core wire 4 can be wound around the outer periphery of the reinforcing member 1 while being guided and positioned. At the same time, the touch pulley 3 is moved in parallel with the mold 2 as indicated by the arrows in FIG. The position where the core wire 1 is guided by the groove 17 can be moved and wound in a spiral shape.
[0006]
Here, there is a method of winding the core wire 4 in a state where the touch pulley 3 is floated without being directly in contact with the outer periphery of the reinforcing material 1 placed on the mold 2, but in this method, the array of the wound core wires 4 is arranged. When the number of the core wires 4 embedded in the obtained transmission belt T is deteriorated, the strength of the transmission belt T is increased, and when the core wires 4 are in contact with each other, the belt travels. There is a possibility that stress is generated between the core wires 4 and the wires are cut.
[0007]
For this purpose, as shown in FIGS. 4 and 5, the core wire 4 is wound in a state where the touch pulley 3 is pressed against the reinforcing member 1 placed on the mold 2. 4 and 5, reference numeral 4 a indicates the core 4 to be wound around the outer periphery of the reinforcing member 1, and reference numeral 4 b indicates the wound core 4 that has already been wound around the outer periphery of the reinforcing member 1. The core wire 4a to be wound is pressed by the core wire guide groove 17 of the winding core wire pressing portion 5 and wound around the outer periphery of the reinforcing member 1, and the core wire wound around the outer periphery of the reinforcing member 1 4 b is pressed by the wound core wire pressing portion 6. Since winding is performed in a state where the core wire 4a to be wound and the wound core wire 4b are pressed by the touch pulley 3, the alignment of the core wires 4 on the outer periphery of the reinforcing member 1 is improved. It is.
[0008]
[Problems to be solved by the invention]
By pressing the touch pulley 3 against the reinforcing material 1 placed on the mold 2 as described above, the core wires 4 can be wound around the spiral well, but on the other hand, the mold 2 is pressed by the action of the pressing force by the touch pulley 3. It becomes easy to generate the twist by the shift | offset | difference to the reinforcing material 1 covered. The reinforcing material 1 is produced by sewing the end portions of the canvas, which are joined together in a cylindrical shape, and the transmission belt T is manufactured so that the seam 14 is located at the top of the tooth portion 13 as shown in FIG. For this purpose, it is necessary to cover the reinforcing material 1 with the mold 2 so that the seam 14 is located at the position of the concave groove 11 and to perform molding. However, when the core wire 4 is wound, the reinforcing material 1 If the slippage occurs, the seam 14 of the reinforcing member 1 may be displaced from the position of the groove 11, and the seam 14 is displaced from the top of the tooth portion 13, and the seam 14 exists at a position such as a valley between the tooth portions 13. As a result, the transmission belt T having a problem in strength may be manufactured.
[0009]
Here, the principle of twisting of the reinforcing material 1 when the core wire 4 is wound will be described with reference to FIG.
[0010]
The touch pulley 3 is not rotationally driven by itself, and as shown in FIGS. 4 and 5, the wound core wire pressing portion 6 is pressed against the wound core wire 4 b that is already wound around the outer periphery of the reinforcing member 1. Accordingly, the touch pulley 3 is rotated as indicated by the arrow in FIG. 5 following the rotational drive of the mold 2, and the core wire 4 a to be wound around the outer periphery of the reinforcing member 1 has an angle θ Is wound around the core wire guide groove 17 of the winding core wire pressing portion 5. A point on the surface of the core wires 4 a and 4 b that are in contact with the portion closest to the mold 2 on the outer periphery of the touch pulley 3 is A 0 , and the core wire 4 a to be wound from now on is the winding core wire pressing portion 5 of the touch pulley 3. An arc A 0 B 0 which is a range wound around the outer circumference of the arc is taken as an arc A 0 B 0 , and further, the point C 0 is wound outside the wound core 4b so that the arc A 0 B 0 = the arc A 0 C 0 Plot on the surface of. Also, the intersection of the extension line of the straight line connecting the axis 15 of the touch pulley 3 and the point A 0 and the pitch line p of the core wire 4a to be wound from now on, and the straight line connecting the rotation axis 16 of the mold 2 and the point A 0 are wound. Since the intersections of the attached core wire 4b and the pitch line p coincide with each other in FIG. 5, they are plotted as a point A 1 , and a straight line extending from the axis 15 of the touch pulley 3 to the point B 0 and an attempt to wrap from now on. The intersection of the core wire 4a with the pitch line p is plotted as a point B 1 , and the intersection of the straight line connecting the rotation axis 16 and the point C 0 of the mold 2 with the pitch line p of the wound core wire 4b is plotted. Plot as C 1 . The pitch line p of the core wire 4 is substantially at the center of the core wire 4.
[0011]
Since the radius r 1 and the radius r 1 of the winding already cord holding portion 6 of the winding core wire holding portion 5 of Tatchipuri 3 are equal, if there is no slip between the Tatchipuri 3 and core wires 4, the die 2 rotates drive Accordingly, the speed of the outer surface of the wound core wire 4b rotated along with the speed of the outer peripheral surface of the wound core wire pressing portion 5 of the touch pulley 3 becomes equal. The speed of the inner surface of the core wire 4a is equal to the speed of the outer surface of the wound core wire 4b. That is, [feed speed of the inner surface of the core 4a to be wound: feed speed of the outer surface of the wound core 4b = arc A 0 B 0 : arc A 0 C 0 ], and arc A 0 B 0 = Arc A 0 C 0
[0012]
Here, when the feed speed of the core wire 4a to be wound and the feed speed of the wound core wire 4b are compared with respect to the pitch line p, which is the true length of the core wire 4, [core wire to be wound] 4a feed speed: feed speed of the wound core wire 4b = arc A 1 B 1 : arc A 1 C 1 ]. When the thickness (diameter) of the core wire 4 is t and the radius from the rotation shaft 16 at the center of the mold 2 obtained by adding the thickness of the reinforcement 1 to the mold 2 to the outer periphery of the reinforcement 1 is r 2 , the arc A 1 B 1 / arc A 0 B 0 = (r 1 +0.5 t) / r 1 , and arc A 1 C 1 / arc A 0 C 0 = (r 2 +0.5 t) / (r 2 + t) . Since arc A 0 B 0 = arc A 0 C 0 as described above, [feed speed of core 4a to be wound: feed speed of wound core 4b = arc A 1 B 1 : arc A 1 C 1 = (r 1 +0.5 t) / r 1 : (r 2 +0.5 t) / (r 2 + t)]. Since r 2 is generally greater than r 1 , (r 1 +0.5 t) / r 1 > (r 2 +0.5 t) / (r 2 + t), and therefore arc A 1 B 1 > arc A 1 C 1 . Therefore, the feed speed of the core wire 4a to be wound is always higher than the feed speed of the wound core wire 4b.
[0013]
Thus, if the feeding speed of the core wire 4a to be wound is higher than the feeding speed of the wound core wire 4b, the length of the core wire 4a to be fed is larger than that of the fed core wire 4b. The core wire 4a escapes in the direction in which the feeding is completed, that is, in the rotational direction of the mold 2, and as a result, the reinforcing material 1 is displaced in the rotational direction of the mold 2 and twisting occurs.
[0014]
The present invention has been made in view of the above points, and when winding a core wire while pressing with a touch pulley, the core wire can be wound around the outer periphery of the reinforcing material without causing the reinforcing material to shift and twist. An object of the present invention is to provide a core winding device for forming a transmission belt.
[0015]
[Means for Solving the Problems]
The present invention includes a mold 2 for forming a transmission belt with a reinforcing material 1 placed on the outer periphery thereof, and is rotatable in contact with the outer periphery of the reinforcing material 1 covered with the die 2 and moved along the axial direction of the die 2. A touch pulley 3 that is driven, and by rotating the mold 2 while pressing the core wire 4 that is supplied to the outer periphery of the reinforcing material 1 covered on the mold 2 with the outer peripheral surface of the touch pulley 3, In a core winding device for forming a transmission belt in which a belt 4 is wound around the outer periphery of a reinforcing material 1, a winding core wire presser for pressing the core wire 4 that is supplied to the outer periphery of the reinforcing material 1 and wound around the touch pulley 3. The wound core wire pressing portion 6 that presses the wound core wire 4 around the outer periphery of the reinforcing member 1 is formed, and the radius r 3 of the wound core wire pressing portion 6 is set to Formed larger than the radius r 1 It is a feature.
[0016]
In the invention of claim 2, the radius of the winding core wire pressing portion 5 of the touch pulley 3 is r 1 , the radius of the wound core wire pressing portion 6 is r 3 , and the radius of the mold including the thickness of the reinforcing material 1 is set. When r 2 and the thickness of the core wire 4 are t, the difference d between the radius r 3 of the wound core wire retainer 6 and the radius r 1 of the wound core wire retainer 5 is
d = A × (0.5t (r 1 + r 2 ) / r 2 )
(However, A is a coefficient of 0.1 to 0.7)
It is characterized by being set to.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0018]
1 and 2 show an example of an embodiment of the present invention, and the touch pulley 3 is formed in a columnar shape (or a cylindrical shape) and is rotatable around a shaft 15. . Further, the touch pulley 3 is integrally formed with one end portion in the axial direction as a wound core wire pressing portion 5 and the other portion in the axial direction as a wound core wire pressing portion 6. A core wire guide groove 17 is recessed in the outer periphery of the wire. And in this Tatchipuri 3, winding cord than r 1 (radius at the groove bottom portion of the core wire guide grooves 17) pressing portion 5 of the radius, forming a radius r 3 of the winding already cord pressing portion 6 to a larger size It is.
[0019]
In addition, as described above, the mold 2 is formed of a cylindrical body (or a columnar body) formed by providing a large number of concave grooves 11 for forming tooth portions on the outer periphery in parallel with the axial direction. 16 is driven to rotate. The touch pulley 3 is arranged on the outer periphery of the mold 2 so that the shafts 15 and 16 are parallel to each other, and is moved and driven in a direction parallel to the axial direction of the mold 2.
[0020]
The outer periphery of the mold 2 is covered with a reinforcing material 1 formed by sewing a sheet material such as a canvas into a cylindrical shape, and a cord 4 is spirally wound around the outer periphery of the reinforcing material 1 covered with the mold 2. When winding in the shape, the core wire 4 is supplied to the outer periphery of the reinforcing member 1, and the core wire 4 is guided by the core wire guide groove 17 of the winding core wire pressing portion 5 of the touch pulley 3, while the mold 2 is shown in FIG. 1 and the touch pulley 3 can be moved parallel to the mold 2 as indicated by the arrows in FIG. The touch pulley 3 is given a pressing force for pressing the core wire 4 against the reinforcing member 1 placed on the mold 2, and the core wire 4 a to be wound from now on is a core guide for the wound core wire presser 5. Since the core wire 4 b wound around the outer periphery of the reinforcing material 1 is pressed by the wound core wire pressing portion 6 at the same time as being pressed by the groove 17 and wound around the outer periphery of the reinforcing material 1, The arrangement of the cores 4 on the outer periphery can be made favorable.
[0021]
Then, as described with reference to FIG. 5 of the conventional example, when the core wire 4 is wound around the outer periphery of the reinforcing member 1 by rotating the mold 2 while being pressed by the touch pulley 3, the core wire 4a to be wound is sent. When the speed is faster than the feeding speed of the wound core wire 4b, the reinforcing material 1 is partially pulled and moved by the wound core wire 4a, and the reinforcing material 1 is displaced in the rotational direction of the mold 2 to cause twisting. appear. Therefore, if the feeding speed of the core 4a to be wound is equal to the feeding speed of the wound core 4b, the length of the core 4a to be fed is equal to the length of the core 4b to be fed. The reinforcing material 1 is not partially pulled around the wound core wire 4a, and it is possible to prevent the reinforcing material 1 from being displaced and twisted.
[0022]
Than the radius r 1 of the winding core wire holding portion 5 of Tatchipuri 3 in the present invention, by forming the radius r 3 of the winding already cord pressing portion 6 in large dimensions, and the outer periphery of the winding core wire pressing portion 5 A difference is made in the peripheral speed on the outer periphery of the wound core wire pressing part 6, and the feeding speed of the core wire 4 a to be wound from now on while pressing the wound core wire pressing part 5, and pressing by the wound core wire pressing part 6 The feeding speed of the wound core wire 4b is made equal, and this principle will be described with reference to FIG.
[0023]
2, A 0 , B 0 , C 0 , A 1 , B 1 , C 1 are the same as those in FIG. 5 (where A 0 is a point on the surface of the core 4a to be wound, A 1 is a point on the pitch line p of the core 4a to be wound). Further, since the radius r 3 of the wound core wire presser 6 is formed larger than the radius r 1 of the wound core wire presser 5, the reinforcing material 1 and the wound core are wound by the wound core wire presser 6. The wire 4b is compressed, and the point on the outer surface of the wound core wire 4b that contacts the portion closest to the mold 2 in the outer periphery of the wound core wire pressing portion 6 is A 3 , and the rotating shaft 16 of the mold 2 plotted as a 5 points on the pitch line p lines and winding pre cord 4b connecting the preparative point a 3. As in the case of FIG. 5, arc A 0 B 0 = arc A 0 C 0 and the wound core wire 4b is compressed, but substantially arc A 0 C 0 = arc A 3 C 0 There is no problem. Then, a point B 3 where arc A 3 C 0 = arc A 3 B 3 is plotted on the outer peripheral surface of the wound core wire holding part 6, and a straight line connecting the axis 15 and B 3 which is the center of the touch pulley 3 is wound. A point B 4 that intersects the pitch line p of the core 4a to be plotted is plotted.
[0024]
Here, as described above, the touch pulley 3 is not driven to rotate by itself, and the wound core wire pressing portion 6 is in pressure contact with the wound core wire 4b that is already wound around the outer periphery of the reinforcing member 1. Thus, the touch pulley 3 is rotated as indicated by the arrow in FIG. Since arc A 3 C 0 = arc A 3 B 3 , the mold 2 is driven to rotate as indicated by the arrow in FIG. 2 to send the wound core wire 4b, and on the outer periphery of the wound core wire 4b. When the point C 0 reaches the point A 3 in FIG. 2, the touch pulley 3 is rotated so that the point B 3 on the outer periphery of the winding core wire pressing part 6 reaches the point A 3 in FIG. Along with this rotation of the touch pulley 3, the core wire 4 a to be wound is sent by the winding core wire pressing portion 5. Therefore, when the feed speed of the core wire 4a to be wound at this time and the feed speed of the wound core wire 4b are compared with respect to the pitch line p which is the true length of the core wire 4, The feed rate of the core wire 4a: The feed rate of the wound core wire 4b = arc A 1 B 4 : arc A 5 C 1 ] is established. As apparent from FIG. 2, arc A 1 B 4 <arc A 1 B 1 , and arc A 5 C 1 = arc A 1 C 1 is substantially satisfied. The feeding speed of the core 4a: the feeding speed of the wound core 4b = the arc A 1 B 1 : the arc A 1 C 1 ]. Can do. Therefore, the state where the feed speed of the core wire 4a to be wound is higher than the feed speed of the wound core wire 4b as in the prior art is eliminated, and the feed speed of the core wire 4a to be wound and the wound core wire are eliminated. It becomes possible to make the feed speeds of 4b as equal as possible, and it is possible to prevent the reinforcing material 1 from being displaced and twisted.
[0025]
Then, necessary to prevent the twisting that reinforcement 1 is displaced, the difference d of the radius r 1 and the radius r 3 of the winding already cord holding portion 6 of the winding core wire holding portion 5 in Tatchipuri 3 Based on FIG. That is, arc A 1 B 4 = arc A from the above relationship [feed speed of core 4a to be wound: feed speed of wound core 4b = arc A 1 B 4 : arc A 5 C 1 ] If it is 5 C 1 , the speed of the core wire 4a to be wound is equal to the speed of the wound core wire 4b, and the reinforcing material 1 can be prevented from being displaced and twisted. Accordingly, as a necessary condition for setting the arc A 1 B 4 = arc A 5 C 1 , a difference d between the radius r 1 of the wound core wire pressing portion 5 and the radius r 3 of the wound core wire pressing portion 6 can be obtained. That's fine.
[0026]
In FIG. 2, arc A 5 C 1 / arc A 3 C 0 = (r 2 +0.5 t) / (r 2 + t) (the wound core 4b is compressed, but both sides are substantially It may be equally equal). Further, arc A 1 B 4 / arc A 3 B 3 = (r 1 +0.5 t) / r 3 = (r 1 +0.5 t) / (r 1 + d). Since arc A 3 C 0 = arc A 3 B 3 , arc A 1 B 4 : arc A 5 C 1 = (r 1 +0.5 t) / (r 1 + d) :( r 2 +0.5 t) / ( r 2 + t). The condition for establishing arc A 1 B 4 = arc A 5 C 1 is (r 1 +0.5 t) / (r 1 + d) = (r 2 +0.5 t) / (r 2 + t). When this equation is expanded, d = 0.5t (r 1 + r 2 + t) / (r 2 + 0.5t). Since t is sufficiently smaller than r 1 and r 2 , r 1 + r 2 + t≈r 1 + r 2 and r 2 + 0.5t≈r 2 can be obtained. Therefore, d = 0.5t (r 1 + r 2 ) / r 2 can be obtained.
[0027]
Thus, necessary to prevent the twisting that reinforcement 1 is displaced, the difference between the radius r 1 and the radius r 3 of the winding already cord holding portion 6 of the winding core wire holding portion 5 in Tatchipuri 3 d Is
d = 0.5t (r 1 + r 2 ) / r 2 (1)
Can be obtained as In reality, however, slippage between the core wire 4 and the touch pulley 3, sinking of the core wire 4 due to compression deformation of the reinforcing material 1, and the like are complicatedly affected. Since there is a tangled phenomenon that deviates in the opposite direction to the rotation of the mold 2, it is necessary to correct the above equation (1) obtained theoretically by applying a coefficient. As shown in FIG. 6, when the pressing force of the touch pulley 3 acts on the reinforcing material 1 covered on the outer periphery of the mold 2 via the core wire 4a to be wound from now on, the tackle phenomenon is caused by the pressing force. 1 is caused by partially floating from the surface of the mold 2 and being pushed and shifted in the direction opposite to the rotation direction of the mold 2, and a shift that occurs when the core 4 is wound around the outer periphery of the reinforcing material 1. Therefore, the reinforcing material 1 is displaced in the direction opposite to the direction in which the reinforcing material 1 bends in the rotational direction of the mold 2. Therefore, d = A × (0.5t (r 1 + r 2 ) / r 2 ) (2) obtained by multiplying the above equation (1) by a coefficient A of 1 or less.
Is practically adopted. The coefficient A varies depending on the material of the reinforcing material 1 and the core wire 4, but is empirically determined to be 0.1 to 0.7 from a test using an actual machine.
[0028]
Here, when manufacturing a toothed belt having a number of teeth of 106, a tooth profile MY, and a belt width of 25 mm, when r 1 = 70 mm, r 2 = 135 mm, and t = 1.20 mm, these numerical values are substituted to obtain an equation ( When d is obtained from 1), d = 0.9 mm, and when this is multiplied by a coefficient A = 0.1 to 0.7, d = 0.09 mm to 0.63 mm. Therefore, in the case of the touch pulley 3 in which the radius r 1 of the wound core wire pressing portion 5 is 70 mm, the reinforcing material 1 is formed by forming the radius r 3 of the wound core wire pressing portion between 70.09 mm and 70.63 mm. The core wire 4 can be wound while reliably preventing the twisting and twisting.
[0029]
In the present invention, as described above, the radius r 3 of the wound core wire pressing portion 6 of the touch pulley 3 is formed to be larger than the radius r 1 of the wound core wire pressing portion 5. When the pressing force of the wound core wire pressing portion 6 against the wire 4b is weak, the wound core wire pressing portion 5 floats from the core wire 4a to be wound, and the core wires 4 wound around the outer periphery of the reinforcing member 1 are arranged. May get worse. For this purpose, an additional pressing force is applied to the touch pulley 3 so that the wound core wire 4b and the reinforcing material 1 are compressed by the wound core wire pressing portion 6 and wound by the wound core wire pressing portion 5. It is necessary to be able to hold down the core wire 4a. Also in this manner so as to strongly press Tatchipuri 3, the ratio of the radius r 1 and the radius r 3 of the winding already cord holding portion 6 of the winding core wire holding portion 5 in Tatchipuri 3 formed of a metal material same As a result, there is no effect on the effect of preventing the reinforcing member 1 from shifting and twisting. Further, since the core wire 4 and the reinforcing material 1 are made of a fiber material, there is no problem in the performance of the transmission belt T even if it is temporarily pressed by the touch pulley 3 and compressed and deformed.
[0030]
【The invention's effect】
As described above, the present invention is a transmission belt molding die having a reinforcing material placed on the outer periphery thereof, and can be rotated in contact with the outer periphery of the reinforcing material placed on the die and driven along the axial direction of the die. The core wire is spirally wound around the outer periphery of the reinforcing material by rotating the die while pressing the core wire supplied to the outer periphery of the reinforcing material covered on the die with the outer peripheral surface of the touch pulley. In the core winding device for forming a transmission belt that is wound in the shape of a wire, a winding core wire pressing portion that holds the core wire that is supplied to the outer periphery of the reinforcing material and wound around the touch pulley, and a core that has been wound around the outer periphery of the reinforcing material Since the wound core wire holding part that holds the wire is formed, it is possible to wind the core wire while holding down the wound core wire and the wound core wire. The arrangement of cores in those which can be a good thing. In addition, since the radius of the wound core wire holding part is formed larger than the radius of the wound core wire holding part, the peripheral speed of the outer circumference of the wound core wire holding part and the outer circumference of the wound core wire holding part is increased. Make a difference so that the feeding speed of the core wire that is going to be wound while being pressed by the winding core wire holding part is equal to the feeding speed of the wound core wire that is pressed by the wound core wire holding part. The core wire can be wound around the outer periphery of the reinforcing material while preventing twisting due to the displacement of the reinforcing material caused by the speed of the core wire to be wound is higher than the speed of the wound core wire. is there.
[Brief description of the drawings]
FIG. 1 is a partial front view showing an example of an embodiment of the present invention.
FIG. 2 is a side view of a part of the above.
3A is a side cross-sectional view showing an example of a process for manufacturing a transmission belt, and FIG. 3B is an enlarged perspective view showing a part of the transmission belt.
FIG. 4 is a partial front view showing a conventional example.
FIG. 5 is a partial side view of the above.
FIG. 6 is a partial side view showing a phenomenon of tackle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement material 2 Mold 3 Touch pulley 4 Core wire 5 Winding core wire holding part 6 Rolled core wire holding part

Claims (2)

補強材を外周に被せた伝動ベルト成形用の金型と、金型に被せた補強材の外周に接して回転自在で且つ金型の軸方向に沿って移動駆動されるタッチプーリとを備えて成り、金型に被せた補強材の外周に供給される心線をタッチプーリの外周面で押さえながら金型を回転駆動させることによって、心線を補強材の外周にスパイラル状に巻き付けるようにした伝動ベルト成形用心線巻付け装置において、タッチプーリに、補強材の外周に供給されて巻き付けられる心線を押さえる巻付け心線押さえ部と、補強材の外周に巻き付け済みの心線を押さえる巻済み心線押さえ部を形成すると共に、巻済み心線押さえ部の半径を巻付け心線押さえ部の半径よりも大きく形成して成ることを特徴とする伝動ベルト成形用心線巻付け装置。A transmission belt molding die with a reinforcing material on the outer periphery, and a touch pulley that is rotatable in contact with the outer periphery of the reinforcing material on the die and driven to move along the axial direction of the die. The belt is wound around the outer periphery of the reinforcing material in a spiral shape by rotating the die while holding the core wire supplied to the outer periphery of the reinforcing material placed on the die with the outer peripheral surface of the touch pulley. In the core winding device for molding, a wound core wire pressing part that presses the core wire that is supplied to the outer periphery of the reinforcing material and wound around the touch pulley, and a wound core wire presser that holds the core wire wound around the outer periphery of the reinforcing material. And a core winding device for forming a transmission belt, wherein the winding core wire pressing portion has a radius larger than that of the winding core wire pressing portion. タッチプーリの巻付け心線押さえ部の半径をr1、巻済み心線押え部の半径をr3、補強材の厚みも含めた金型の半径をr2、心線の厚みをtとすると、巻済み心線押え部の半径r3と巻付け心線押さえ部の半径r1の差dを、
d=A×(0.5t(r1+r2)/r2
(ただし、Aは0.1〜0.7の係数)
に設定することを特徴とする請求項1に記載の伝動ベルト成形用心線巻付け装置。
If the radius of the winding core pressing part of the touch pulley is r 1 , the radius of the wound core pressing part is r 3 , the radius of the mold including the thickness of the reinforcing material is r 2 , and the thickness of the core is t. The difference d between the radius r 3 of the wound core wire holding part and the radius r 1 of the wound core wire holding part is given by:
d = A × (0.5t (r 1 + r 2 ) / r 2 )
(However, A is a coefficient of 0.1 to 0.7)
The core winding device for forming a transmission belt according to claim 1, wherein
JP2000278131A 2000-09-13 2000-09-13 Wire winding device for forming transmission belts Expired - Fee Related JP4445112B2 (en)

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JPH0692133B2 (en) * 1991-03-07 1994-11-16 三ツ星ベルト株式会社 Automatic rope winding device
JP3195533B2 (en) * 1996-03-29 2001-08-06 バンドー化学株式会社 Transmission belt forming device
JPH10235742A (en) * 1997-02-25 1998-09-08 Mitsuboshi Belting Ltd Spinning device for manufacturing toothed belt
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