JPS5815042A - Drawing line - Google Patents

Drawing line

Info

Publication number
JPS5815042A
JPS5815042A JP11464681A JP11464681A JPS5815042A JP S5815042 A JPS5815042 A JP S5815042A JP 11464681 A JP11464681 A JP 11464681A JP 11464681 A JP11464681 A JP 11464681A JP S5815042 A JPS5815042 A JP S5815042A
Authority
JP
Japan
Prior art keywords
take
sub
tension
optical fiber
strand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11464681A
Other languages
Japanese (ja)
Other versions
JPS6131064B2 (en
Inventor
Yutaka Mitsunaga
満永 豊
Katsuji Sakamoto
勝司 坂本
Toru Yamanishi
徹 山西
Taku Yamazaki
卓 山崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp, Sumitomo Electric Industries Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP11464681A priority Critical patent/JPS5815042A/en
Publication of JPS5815042A publication Critical patent/JPS5815042A/en
Publication of JPS6131064B2 publication Critical patent/JPS6131064B2/ja
Granted legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/02Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/03Drawing means, e.g. drawing drums ; Traction or tensioning devices
    • C03B37/032Drawing means, e.g. drawing drums ; Traction or tensioning devices for glass optical fibres

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To prevent the loss of an optical fiber strand despite the breakage of the strand during working and the decrease in operating efficiency by installing plural regulators for take-off tension and linear speeds of the optical fiber and controllers for the linear speeds in the drawing line for the optical fiber. CONSTITUTION:In a device for spinning an optical fiber from the base material thereof, the 1st auxiliary take-off 24, the 2nd auxiliary take-off 11 and a coiler 13 are disposed in succession to a main take-off 9. A wire accumulator 25 is installed between the take-off 9 and the take-off 24. Also, regulators 28, 22, 23 for the take-off tension and linear speeds of the devices 9, 24, 11, 13 and controllers 15, 30, 16, 19 for linear speeds are installed. If an optical fiber strand 7 breaks between the take-off 24 and the take-off 11 during working, a speed decrease command signal 32 is applied to the 2nd controller 30, by which the speed is decreased; at the same time, the speeds of the take-off 11 and the coiler 13 are decreased, whereby the stoppage of the take-off of the strand on the wire accumulator side is obviated despite the breakage of the strand 7, and the loss of the strand and the decrease in operating efficiency are eliminated.

Description

【発明の詳細な説明】 本発明は、光ファイバの線引ラインに於ける構成に関す
るものである。光ファイバの線引ラインの機能は、光フ
ァイバの母材を、炉(通常電気炉)へ、一定速度で供給
し、先端を溶融し母材下端より一定の速度で引出すこと
により、ファイバを形成する。そのファイバ外周に、シ
リコン等の合成樹脂を塗布被覆し、次いで加熱炉内を通
過させることにより硬化させる。これで一応の光ファイ
バの素線(以下素線)ができ、次いで別の設備である押
出ラインに供給し、ナイロン等の2次被覆を施して、光
フアイバ心線を得るのである。しかしこの心線の抗張力
がある値以下であると、最終的に光ケーブルとして布設
する際、布設張力)Cより心線が破断することがある。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure in an optical fiber drawing line. The function of an optical fiber drawing line is to form a fiber by feeding the base material of the optical fiber into a furnace (usually an electric furnace) at a constant speed, melting the tip, and drawing it out from the bottom end of the base material at a constant speed. do. The outer periphery of the fiber is coated with a synthetic resin such as silicone, and then passed through a heating furnace to be cured. This produces a strand of optical fiber (hereinafter referred to as strand), which is then fed to an extrusion line, which is another facility, and is coated with a secondary coating of nylon or the like to obtain a cored optical fiber. However, if the tensile strength of the core wire is below a certain value, the core wire may break due to the laying tension C when it is finally laid as an optical cable.

そこで通常、素線の状態で一度張力を加え所要の抗張力
に達しない部分を予め破断させる。いわゆるスクリーニ
ングを行う必要があり、能率の点より線引ディンにて行
うのが普通である。ここで線引ラインに於いて、スクリ
ーニングを行う際の問題として、従来の線引ラインでは
、素線が破断すると、手で線掛けできる程度までライン
全体の速度を降下させている。
Therefore, usually, tension is applied once to the strands and the portions where the required tensile strength is not reached are broken in advance. It is necessary to carry out so-called screening, and from the point of view of efficiency, it is usually carried out at the drawing board. Here, a problem when performing screening on a drawing line is that in a conventional drawing line, when a strand breaks, the speed of the entire line is reduced to the extent that it can be drawn by hand.

この方法では、断線することに;より、ラインの稼動率
が低下する問題があった。先づ本発明の内容説明を容易
にするために第1図に示す従来の線引ラインを説明する
。■は光フアイバ母材、■は母材の供給装置で光フアイ
バ母材■を電気炉■へ一定の速度で送る。■は樹脂の塗
布装置で、光ファイバ■の外周に、シリコン樹脂等を塗
布被覆する。
This method has the problem of lowering the operating rate of the line due to wire breakage. First, in order to facilitate the explanation of the contents of the present invention, the conventional drawing lines shown in FIG. 1 will be explained. (2) is an optical fiber base material, and (2) is a base material feeding device that feeds the optical fiber base material (2) to the electric furnace (2) at a constant speed. (2) is a resin coating device that coats the outer periphery of the optical fiber (2) with silicone resin or the like.

■は加熱炉であり、樹脂を硬化させ、素線■を得る。■
はガイドローラー、■は主引取装置で、素線■を一定の
速度で引取る。[株]はダンサ−ローラーで、次の副引
取機■′の速度制御を行う。■はダンサ−ローラーで、
次の巻取機0の速度制御を行う。主引取機より巻取機ま
での速度制御の関係について説明すると、0は主引取機
駆動可変速モータで、主制御器[相]による指令速度で
運転する。[相]は副引取装置0′の速度を指令する制
御器で主制御器[株]の指令を受け、さらにダンサ−ロ
ーラー[株]の変位検出器Oよりの補正信号をとり入れ
て、可変速モータ■′に駆動する。■は巻取装置0の速
度を指令する制御器で、制御器0の出力信号を受け、さ
らにダンサ−ローラー0の変位検出器[株]よりの補正
信号をとり入れて、可変速モーターを駆動する。以上説
明した駆動系に於いて、主引取機■と副引取■′の間の
素線■の張力はダンサ−ローラー[株]の移動側ローラ
ー@の荷重@の値により決まり同様に、巻取機0に巻取
られる素線■の張力はダンサ−ローラー0の荷重@によ
り決まる。従って前者の張力を強く、後者を弱くするこ
とができる。
(2) is a heating furnace to harden the resin and obtain a wire (2). ■
is a guide roller, ■ is the main take-off device, and takes off the strand ■ at a constant speed. [Co., Ltd.] uses a dancer roller to control the speed of the next sub-pulling machine ■'. ■ is a dancer roller,
The speed of the next winder 0 is controlled. To explain the relationship of speed control from the main take-up machine to the winding machine, 0 is the main take-up machine drive variable speed motor, which operates at a command speed by the main controller [phase]. [Phase] is a controller that commands the speed of the sub-pulling device 0', which receives commands from the main controller [Co., Ltd.], and further takes in the correction signal from the displacement detector O of the Dancer Roller [Co., Ltd.] to control the speed of the sub-pulling device 0'. Driven by motor ■′. ■ is a controller that commands the speed of winding device 0, receives the output signal of controller 0, and also receives a correction signal from the displacement detector of dancer roller 0 to drive the variable speed motor. . In the drive system explained above, the tension of the wire ■ between the main take-up machine ■ and the sub-take-up machine ■′ is determined by the value of the load @ of the moving roller of Dancer Roller Co., Ltd. The tension of the strand (■) wound on the machine 0 is determined by the load @ of the dancer roller 0. Therefore, the tension of the former can be made strong and the tension of the latter made weak.

ここで前者はスクリーニング張力で、後者は巻取張力で
ある。素線の巻取張力はできるだけ小さいことが望まし
いため、以上説明した構成が一般的である。この従来の
ラインでは、スクリーニングにより主引取機■と副引取
機■′の間で素線■が破断すると、手動にて素線のかけ
直し、つまりダンサ−ローラー[株]、副引取装置■′
より巻取機0に至るまで、かけ直しが可能の速度まで、
ライン全体の線速を低下させた後、かけ直しを行い、再
度ライン全体の速度を上昇させる。従って、その間の素
線が不良になったり、また稼動率が低下する欠点がある
。本発明は、このような問題を解決するもので、具体的
には、スクリーニングにより素線が破断しても不良素線
を多量に出したり、稼動率を低下することの無い方法を
提供するものでありその特徴とするところは、光フアイ
バ母材を溶融加熱して紡糸する装置において、主引取装
置に続いて副第1引取装置、副第2引取装置および巻取
装置が順に配設され、少くとも前記主引取装置と副第1
引取装置の間には蓄線装置を、前記主引取装置、副第1
引取装置、副第2引取装置、巻取装置の引取張力および
線速を調整する装置、さらに前記主引取装置、副第1引
取装置、副第2引取装置、巻取装置の線速を制御する装
置とを具備した線引ラインである。
Here, the former is the screening tension and the latter is the winding tension. Since it is desirable that the winding tension of the strands be as small as possible, the configuration described above is common. In this conventional line, when the wire ■ breaks between the main take-off machine ■ and the sub-take-off machine ■' due to screening, the wire must be re-attached manually, that is, by using Dancer Roller [Co., Ltd.] and the sub-take-off machine ■'
until the winder reaches 0, up to a speed that allows rewinding,
After reducing the linear speed of the entire line, the line is restarted and the speed of the entire line is increased again. Therefore, there are disadvantages in that the strands between them become defective and the operating rate decreases. The present invention aims to solve these problems, and specifically provides a method that does not produce a large amount of defective wires or reduce the operating rate even if the wires break due to screening. The feature is that in an apparatus for melting and heating an optical fiber preform for spinning, a main take-off device is followed by a sub-first take-off device, a sub-second take-off device, and a winding device. At least the main take-off device and the first sub-collection device.
A wire storage device is installed between the collection devices, the main collection device and the sub-first
A device for adjusting the take-up tension and linear speed of the take-up device, the sub-second take-up device, and the take-up device, and further controls the line speed of the main take-up device, the sub-first take-up device, the sub-second take-up device, and the take-up device. It is a drawing line equipped with a device.

次に本発明の詳細を第2図により説明する。なお従来の
ラインと同一記号は同一装置部品を示す。
Next, details of the present invention will be explained with reference to FIG. Note that the same symbols as in the conventional line indicate the same equipment parts.

■は主引取装置、@は副第1引取装置、[株]は副第2
引取装置、■の速度制御を行うダンサ−ローラー、■は
巻取装置0の速度制御を行うダンサ−ローラー、[株]
は素線の蓄線を行うための蓄線装置である。@のガイド
ローラ一群は、固定側のガイドローラーで@で示すガイ
ドローラ一群は移動側のガイドローラーで荷重[株]に
より、常に素線■を蓄線する方向に、引っ張られている
。@は副第1引取装置[相]を速度制御するための検出
器で、蓄線装置[株]が蓄線していない時、換言すれば
素線がスクリーニングにより破断しない時に、移動側ガ
イドローラ一群@が固定側ガイドローラ一群[株]た近
い位置にあり、その際、移動側ローラ一群[相]が、検
出器のに果合するように構成されている。次に主引取装
置■より巻取機0までの速度制御の関係について従来の
ラインとの差異を説明すると、主制御器[相]の指令は
主引取装置可変速モーター0を駆動するとともに副第1
制御器のを指令する。副第1制御器のにはスクリーニン
グ破断時以外には蓄線装置[株]の検出器のよりの補正
信号をとり入れて副第1引取装置[相]の可変速モータ
ー■を駆動する。
■ is the main collection device, @ is the sub-1st collection device, [stock] is the sub-2nd
A dancer roller that controls the speed of the take-up device, (■) a dancer roller that controls the speed of the take-up device 0, [Co., Ltd.]
is a wire storage device for storing wires. A group of guide rollers marked @ are guide rollers on the fixed side, and a group of guide rollers marked @ are guide rollers on the movable side that are constantly pulled in the direction of accumulating the strands ■ by a load. @ is a detector for controlling the speed of the sub-first pulling device [phase], and when the wire storage device [Ltd.] is not storing wires, in other words, when the strands are not broken by screening, the moving side guide roller The group of guide rollers on the stationary side is located close to the group of guide rollers on the fixed side, and the group of moving rollers is configured to fit in the direction of the detector. Next, to explain the difference from the conventional line regarding the speed control relationship from the main take-up device 1
Command the controller. The first sub-controller receives the correction signal from the detector of the wire storage device [Co., Ltd.] and drives the variable speed motor (2) of the first sub-drawing device [phase] except when the screening is broken.

なお副第1制御器のには、スクリーニング破断時に速度
をおとし、手動による素線のかけがえを可能ならしめる
ために、速度低下指令信号Φが入るように構成される。
The sub-first controller is configured to receive a speed reduction command signal Φ in order to reduce the speed at the time of screening breakage and to enable manual replacement of the strands.

[相]は副第2制御器で、副第1制御器の指令を受ける
とともにダンサ−ローラー[株]の検出器@の信号をと
り入れて副第2引取装置■の可変速モーター@を駆動す
る。以下巻取機0のモーターの駆動は、従来と同じであ
る。素線の張力は、各ダンサ−ローラー及び蓄線装置の
移動側ガイドローラーウェイト@、■、[株]にて設定
される張力を保つ。本発明の構成では、副第1引取装置
[有]と副第2引取装置Oの間でスクリーニングを行う
。つまり副第1引取装置[有]及び副第2引取装置0は
前述した通り速度制御されているので、この間の素線張
力は、ダンサ−ローラー[株]のウェイト@で設定され
る張力を保っており、この張力は、他の部分、つまり、
巻取機0の張力や蓄線装置[相]の素線張力には影響を
与えないので、この張力の値を大きくしてスクリーニン
グ張力とする。
[Phase] is the sub-second controller, which receives commands from the sub-first controller and receives signals from the detector @ of Dancer Roller [Co., Ltd.] to drive the variable speed motor @ of the sub-second take-up device ■. . Hereinafter, the drive of the motor of the winding machine 0 is the same as the conventional one. The tension of the strands is maintained at the tension set by the moving side guide roller weight @, ■, [Co., Ltd.] of each dancer roller and wire storage device. In the configuration of the present invention, screening is performed between the sub-first collection device [existing] and the sub-second collection device O. In other words, since the speeds of the sub-first pulling device [Yes] and the sub-second pulling device 0 are controlled as described above, the tension of the strands between them is maintained at the tension set by the weight @ of Dancer Roller [Co., Ltd.]. and this tension is applied to other parts, i.e.
Since it does not affect the tension of the winder 0 or the strand tension of the wire storage device [phase], the value of this tension is increased and used as the screening tension.

同様に他の部分、つまり、主引取装置■と副第1引取装
置[相]の間の張力は、ウェイト[株]にて設定され、
この張力の値は、断線に至らないような値とする。又副
第2引取装置■と巻取機0の間の張力は、ダンサ−ロー
ラー0のウェイト@で設定できるので、比較的小さくし
て、ゆるく巻取ることができる。ここでスクリーニング
破断した場合の作用について述べると、副第1引取装置
[相]と副第2引取装置■の間の素線が破断すると、副
第2制御器のへ速度低下指令信号Φが与えられ速度が低
下する。同時に副第2引取装置■及び巻取機0の速度も
低下す2る。副第1引取装置■には、図示していない素
線押え機構を有するので、スクリーニングにより素線が
破断しても、蓄線装置側の素線の引取を停止することは
ない。この状態で主引取装置■と副第1引取装置[相]
の速度差が生じるので、蓄線装置[株]の移動側ガイド
ローラー@が、下降し素線■を蓄線する。蓄線中もウェ
イト@にて設定する張力を保つから、この部分で素線が
破断することはない。この状態にて破断部分の素線のか
け替えを行う。かけ終ったら副第1制御器の指令を元に
戻すことにより、副第1引取装置[相]以降の速度が上
昇し、以前の状態に復帰する。しかるに、破断復旧の間
主引取装置■の速度はかわっておらず、復旧の間に製造
された素線は蓄線装置@に吸収されており、再度以前の
状態に復帰する際、スクリーニングされ巻取られるから
、はとんど素線のロスも無く、従ってロス、稼動率の点
で、従来のラインの欠点を改善できる。なお本発明で構
成上重要な点は、前述したように、ラインに於ける素線
張力区画として、蓄線装置部の張力区画、スクリーニン
グ部の張力区画、巻取部の張力区画に分け、しかもこの
順序にラインを構成したことにあり、この構成又は順序
を変えては本発明の目的は達せられない。本文説明では
、この構成の一例を示し説明したが、例えば副第1引取
装置後の構成を第3図に示す通り副第1引取装置[相]
、引取ホイール[相]及びトルク発生装置Φで構成され
る。緊張装置のダンサ−ローラー0巻取機0としても良
い。この場合に於いても張力区間として蓄線装置部■、
スクリーニング部■、巻取部■と明確に分けられ、その
構成順序も同じである。
Similarly, the tension between other parts, that is, the main pulling device ■ and the sub-first pulling device [phase], is set by the weight [stock].
The value of this tension shall be such that it does not lead to wire breakage. Further, since the tension between the sub-second take-up device (2) and the winder 0 can be set by the weight @ of the dancer roller 0, it can be made relatively small and the winding can be done loosely. Here, we will discuss the effect when the screening breaks. When the wire between the sub-first pulling device [phase] and the sub-second pulling device ■ breaks, a speed reduction command signal Φ is given to the sub-second controller. speed will decrease. At the same time, the speeds of the sub-second take-up device (2) and the winder 0 are also reduced (2). Since the sub-first take-off device (2) has a wire holding mechanism (not shown), even if the wire is broken during screening, the wire storage device does not stop taking the wire. In this state, the main collection device ■ and the sub-first collection device [phase]
Since a speed difference occurs, the moving side guide roller @ of the wire storage device [Co., Ltd.] descends and stores the strands ■. Since the tension set by the weight @ is maintained even during wire storage, the wire will not break at this part. In this state, the wire at the broken part is replaced. By returning the command from the sub-first controller to the original state after the completion of the application, the speed of the sub-first take-off device [phase] and subsequent stages increases, returning to the previous state. However, during the recovery from the breakage, the speed of the main take-off device does not change, and the strands produced during the recovery are absorbed into the wire storage device, and when the previous state is restored again, they are screened and wound. Since the line is removed, there is almost no loss of strands, and therefore the drawbacks of conventional lines can be improved in terms of loss and operation rate. An important point in the structure of the present invention is that, as mentioned above, the wire tension section in the line is divided into the tension section of the wire storage device section, the tension section of the screening section, and the tension section of the winding section. The reason is that the lines are arranged in this order, and the object of the present invention cannot be achieved by changing this arrangement or order. In the main text explanation, an example of this configuration has been shown and explained.
, a take-off wheel [phase] and a torque generator Φ. It is also possible to use the dancer roller 0 winder 0 of the tensioning device. In this case as well, the wire storage device section ■,
It is clearly divided into a screening section (2) and a winding section (2), and their construction order is the same.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来の線引ライン、第2図および第8図は本発
明の線引ラインの概要図である。 ■・・・母材、■・・・加熱炉、■・・・素線、■・・
・主引取装置、[相]・・・蓄線装置■・・・副第1引
取装置、■・・・副第2引取装置0・・・巻取装置、@
、[株]、@・・・張力調整装置[相]、@、■、[相
]・・・線速制御装置賃3図 3612 22 :4−
FIG. 1 is a conventional drawing line, and FIGS. 2 and 8 are schematic diagrams of the drawing line of the present invention. ■...Base material, ■...Heating furnace, ■...Element wire, ■...
・Main take-off device, [phase]... Line storage device ■... Sub-first take-off device, ■... Sub-second take-up device 0... Winding device, @
, [Stock], @... Tension adjustment device [Phase], @, ■, [Phase]... Linear speed control device Rental 3 Figure 3612 22: 4-

Claims (1)

【特許請求の範囲】[Claims] (1)光フアイバ母材を溶融加熱して紡糸する装置にお
いて、主引取装置に続いて副第1引取装置、副第2引取
装置および巻取装置が順に配設され、少くとも前記主引
取装置と副第1引取装置との間には、蓄線装置を、前記
主引取装置、副第1引取装置、副第2引取装置、巻取装
置の引取張力および線速を調整する装置、さらに前記主
引取装置、副第1引取装置、副第2引取装置、巻取装置
の線速を制御する装置とを具備したことを特徴とする線
引ライン。
(1) In an apparatus for melting and heating an optical fiber preform for spinning, a main take-off device is followed by a sub-first take-off device, a sub-second take-off device, and a winding device, and at least the main take-off device and the auxiliary first take-up device, a wire storage device, the main take-up device, the sub-first take-up device, the sub-second take-up device, a device for adjusting the take-up tension and wire speed of the take-up device, and further the A wire drawing line comprising a main take-up device, a sub-first take-up device, a sub-second take-up device, and a device for controlling the wire speed of the take-up device.
JP11464681A 1981-07-21 1981-07-21 Drawing line Granted JPS5815042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11464681A JPS5815042A (en) 1981-07-21 1981-07-21 Drawing line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11464681A JPS5815042A (en) 1981-07-21 1981-07-21 Drawing line

Publications (2)

Publication Number Publication Date
JPS5815042A true JPS5815042A (en) 1983-01-28
JPS6131064B2 JPS6131064B2 (en) 1986-07-17

Family

ID=14643006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11464681A Granted JPS5815042A (en) 1981-07-21 1981-07-21 Drawing line

Country Status (1)

Country Link
JP (1) JPS5815042A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6246270A (en) * 1985-08-23 1987-02-28 Chino Corp Input intake device
JPS63117925A (en) * 1986-10-31 1988-05-21 Showa Electric Wire & Cable Co Ltd Production of optical fiber
EP1112979A1 (en) * 1999-12-29 2001-07-04 PIRELLI CAVI E SISTEMI S.p.A. Method and device for controlling the tension applied to an optical fibre

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6246270A (en) * 1985-08-23 1987-02-28 Chino Corp Input intake device
JPH0349390B2 (en) * 1985-08-23 1991-07-29 Chino Corp
JPS63117925A (en) * 1986-10-31 1988-05-21 Showa Electric Wire & Cable Co Ltd Production of optical fiber
EP1112979A1 (en) * 1999-12-29 2001-07-04 PIRELLI CAVI E SISTEMI S.p.A. Method and device for controlling the tension applied to an optical fibre

Also Published As

Publication number Publication date
JPS6131064B2 (en) 1986-07-17

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