JP2952863B2 - Preform preform stretcher for optical fiber - Google Patents
Preform preform stretcher for optical fiberInfo
- Publication number
- JP2952863B2 JP2952863B2 JP24133891A JP24133891A JP2952863B2 JP 2952863 B2 JP2952863 B2 JP 2952863B2 JP 24133891 A JP24133891 A JP 24133891A JP 24133891 A JP24133891 A JP 24133891A JP 2952863 B2 JP2952863 B2 JP 2952863B2
- Authority
- JP
- Japan
- Prior art keywords
- preform
- base material
- optical fiber
- heating furnace
- take
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0126—Means for supporting, rotating, translating the rod, tube or preform
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ファイバ用プリフォ
ーム母材を所定の外径に延伸する装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for drawing a preform preform for an optical fiber to a predetermined outer diameter.
【０００２】[0002]
【従来の技術】光ファイバは、プリフォーム母材を加熱
しながらファイバ線引きして製造される。大径なプリフ
ォーム母材は、酸水素バーナーや加熱炉により加熱しな
がら延伸し、線引きに適した径にしている。2. Description of the Related Art An optical fiber is manufactured by drawing a fiber while heating a preform preform. The large-diameter preform base material is stretched while being heated by an oxyhydrogen burner or a heating furnace to have a diameter suitable for drawing.
【０００３】プリフォーム母材の延伸には、図７に示す
ような延伸装置が使用される。この装置は、上面と下面
とが開口した加熱炉１０の上方に昇降装置２０を配置
し、下方に引き取り装置５０を配置したものである。昇
降装置２０は、駆動源２３に連結したボールねじ軸２４
の回転でチャック２２が昇降するようになっている。引
き取り装置５０は駆動源５１に連結したボールねじ軸５
２の回動によってチャック５３が昇降する構造である。
母材２は上端がチャック２２、下端がチャック５３に把
持されて鉛直に支持され、加熱炉１０を貫通している。[0003] A stretching apparatus as shown in FIG. 7 is used for stretching a preform base material. In this apparatus, an elevating device 20 is arranged above a heating furnace 10 whose upper and lower surfaces are open, and a take-off device 50 is arranged below. The lifting device 20 includes a ball screw shaft 24 connected to a driving source 23.
The chuck 22 is moved up and down by the rotation of. The take-off device 50 includes a ball screw shaft 5 connected to a drive source 51.
The structure is such that the chuck 53 moves up and down by the rotation of 2.
The base material 2 is vertically supported by the chuck 22 at the upper end and the chuck 53 at the lower end, and penetrates through the heating furnace 10.
【０００４】加熱炉１０に通電して母材２を軟化させ、
昇降装置２０を駆動してチャック２２を下降させ、引き
取り装置５０のチャック５３をチャック２２の降下速度
以上の速度で降下すると、母材２は引き取り装置５０側
から順次延伸されてゆく。The heating furnace 10 is energized to soften the base material 2,
When the chuck 22 is lowered by driving the lifting / lowering device 20 and the chuck 53 of the take-up device 50 is lowered at a speed higher than the descent speed of the chuck 22, the base material 2 is sequentially stretched from the take-up device 50 side.
【０００５】ところが、この装置は母材２の下端を把持
して引き取っているため、長尺な母材２の延伸には適し
ていない。母材２の延伸長さがチャック５３の可動距離
によって制限されるからである。長尺な母材２を延伸す
るには引き取り装置５０の可動距離を延伸長さ以上にす
る必要があり、装置全体が大規模になってしまう。[0005] However, since this device grips and pulls the lower end of the base material 2, it is not suitable for stretching a long base material 2. This is because the extension length of the base material 2 is limited by the movable distance of the chuck 53. In order to extend the long base material 2, the movable distance of the take-up device 50 needs to be equal to or greater than the extension length, and the entire device becomes large.
【０００６】そのため、図８に示すように、引き取り装
置５０に一対の駆動ローラ６１を使用した延伸装置が用
いられている。母材２に圧接させた駆動ローラ６１を矢
印のように回転すれば、母材２の把持と、延伸するため
の引き取り駆動とを兼ね合わせた動作を行なわせること
ができる。駆動ローラ６１自体は移動しないため、装置
全体を大規模にすることなく長尺な母材２の延伸が可能
である。For this reason, as shown in FIG. 8, a drawing device using a pair of drive rollers 61 as a take-up device 50 is used. If the drive roller 61 pressed against the base material 2 is rotated as shown by the arrow, an operation combining the holding of the base material 2 and the take-off drive for stretching can be performed. Since the driving roller 61 itself does not move, it is possible to stretch the long base material 2 without increasing the size of the entire apparatus.
【０００７】[0007]
【発明が解決しようとする課題】しかし、この延伸装置
には以下のような問題がある。光ファイバ用母材２が太
径な場合、延伸が開始された部分に団子状の膨らみ２ａ
が生じ易い。母材２が順次引き取られてゆき、膨らみ２
ａが駆動ローラ６１に挟まれると、図９に示すように母
材２に延伸方向が曲げられ、延伸後の母材２が湾曲する
ことがある。図８の延伸装置を用いて直径９０mm、長さ
１０００mmの母材２を、直径３５mm、長さ６６００mmに
延伸したところ、図１０に示すように湾曲部２ｂの軸芯
と母材２の軸芯とのずれｄが最大１５mmに達することも
あった。However, this stretching apparatus has the following problems. When the optical fiber preform 2 has a large diameter, a dumpling-like swelling 2a
Tends to occur. The base material 2 is successively taken, and the bulge 2
When a is sandwiched between the drive rollers 61, the stretching direction is bent by the base material 2 as shown in FIG. 9, and the drawn base material 2 may be curved. When the base material 2 having a diameter of 90 mm and a length of 1000 mm was drawn to a diameter of 35 mm and a length of 6600 mm using the drawing apparatus shown in FIG. 8, the center of the curved portion 2b and the center of the base 2 were obtained as shown in FIG. Deviation d may reach a maximum of 15 mm.
【０００８】本発明は前記の課題を解決するためなされ
たもので、光ファイバ用プリフォーム母材を湾曲するこ
となく高精度で延伸可能な延伸装置を提供することを目
的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a stretching apparatus capable of stretching a preform preform for an optical fiber with high accuracy without curving.
【０００９】[0009]
【課題を解決するための手段】前記の目的を達成するた
めになされた本発明の光ファイバ用プリフォーム母材延
伸装置を一実施例に対応する図１を用いて説明する。An apparatus for stretching a preform preform for an optical fiber of the present invention, which has been made to achieve the above object, will be described with reference to FIG. 1 corresponding to one embodiment.
【００１０】同図に示すように本発明の光ファイバ用プ
リフォーム母材延伸装置は、鉛直な通路を有する加熱炉
１０の上方に、加熱炉１０の通路を鉛直に貫通した光フ
ァイバ用プリフォーム母材２の上端部を把持して昇降可
能な昇降装置２０が配置され、加熱炉１０の下方に、プ
リフォーム母材２の側面に圧接回転して鉛直下方に引き
取る一対の駆動ローラ３２・４２と、該駆動ローラ３２
・４２よりも加熱炉側のプリフォーム母材２の外径を計
測する外径測定器３１・４１とからなる引き取り装置３
０・４０がプリフォーム母材２の進路に沿って複数組配
置されている。駆動ローラ３２・４２は、各引き取り装
置３０・４０毎にプリフォーム母材２から離間可能であ
る。As shown in FIG. 1, the preform preform preform for an optical fiber according to the present invention comprises a preform for an optical fiber having a vertically extending passage through the heating furnace 10 above a heating furnace 10 having a vertical passage. An elevating device 20 that can hold and lift the upper end of the base material 2 is disposed, and a pair of drive rollers 32 and 42 that are pressed below the heating furnace 10 to rotate by pressing against the side surface of the preform base material 2 and pull vertically downward. And the drive roller 32
A take-off device 3 comprising outer diameter measuring devices 31 and 41 for measuring the outer diameter of the preform base material 2 closer to the heating furnace than 42
A plurality of sets 0 and 40 are arranged along the course of the preform base material 2. The drive rollers 32 and 42 can be separated from the preform base material 2 for each of the take-off devices 30 and 40.
【００１１】[0011]
【作用】図１および図２に示すように、母材２に二対の
駆動ローラ３２・４２を圧接させて矢印のように回転駆
動すると、加熱炉１０内で軟化したプリフォーム母材２
は延伸されて下方へ引き出される。この動作と並行して
昇降装置２０を駆動して母材２を緩やかに降下すると、
母材２は下方側から順次延伸されてゆく。As shown in FIGS. 1 and 2, when two pairs of drive rollers 32 and 42 are pressed against the base material 2 and driven to rotate as indicated by arrows, the preform base material 2 softened in the heating furnace 10 is heated.
Is stretched and pulled downward. When the elevating device 20 is driven in parallel with this operation to lower the base material 2 slowly,
The base material 2 is stretched sequentially from the lower side.
【００１２】母材２の延伸開始部分に膨らみ２ａが生じ
た場合、延伸の進行に従って膨らみ２ａが引き取り装置
３０に接近する。すると外径測定器３１が膨らみ２ａの
接近を検知し、図３に示すように駆動ローラ３２は母材
２から離間する。このとき母材２は駆動ローラ４２の駆
動力のみで引き取られ、膨らみ２ａは駆動ローラ３２に
接触することなく駆動ローラ３２間を下方へ移動する。
膨らみ２ａの通過後、駆動ローラ３２は再度母材２に圧
接される（図４参照）。膨らみ２ａがさらに下降して引
き取り装置４０に接近すると、その接近が外径測定器４
１によって検知され、図５に示すように駆動ローラ４２
が母材２から離間する。母材２は駆動ローラ３２の駆動
力のみで引き取られ、膨らみ２ａは駆動ローラ４２に接
触することなく下方へ移動する。膨らみ２ａの通過後、
駆動ローラ４２は図６のように母材２に圧接、回転し、
駆動ローラ３２とともに延伸を続ける。When a bulge 2a occurs at the start of stretching of the base material 2, the bulge 2a approaches the take-up device 30 as the stretching proceeds. Then, the outer diameter measuring device 31 detects the approach of the bulge 2a, and the drive roller 32 is separated from the base material 2 as shown in FIG. At this time, the base material 2 is pulled only by the driving force of the driving roller 42, and the bulge 2a moves downward between the driving rollers 32 without contacting the driving roller 32.
After passing through the bulge 2a, the drive roller 32 is again pressed against the base material 2 (see FIG. 4). When the bulge 2a further descends and approaches the pickup device 40, the approach is detected by the outer diameter measuring device 4.
1 and as shown in FIG.
Are separated from the base material 2. The base material 2 is pulled only by the driving force of the driving roller 32, and the bulge 2a moves downward without contacting the driving roller 42. After passing through the bulge 2a,
The drive roller 42 presses and rotates against the base material 2 as shown in FIG.
The stretching is continued with the driving roller 32.
【００１３】[0013]
【実施例】以下、本発明の実施例を説明する。図１は本
発明を適用する光ファイバ用プリフォーム母材延伸装置
の正面図である。この装置は、基台１１上に設けたフレ
ーム１２に加熱炉１０を取付け、その上方に昇降装置２
０、下方に第１の引き取り装置３０と第２の引き取り装
置４０とを配置したものである。Embodiments of the present invention will be described below. FIG. 1 is a front view of an optical fiber preform preform stretching apparatus to which the present invention is applied. In this apparatus, a heating furnace 10 is mounted on a frame 12 provided on a base 11, and an elevating device 2
0, the first take-up device 30 and the second take-up device 40 are arranged below.
【００１４】加熱炉１０は上面と下面とが開口した電気
炉で、鉛直方向に貫通した通路を有している。The heating furnace 10 is an electric furnace whose upper and lower surfaces are open and has a vertically penetrating passage.
【００１５】昇降装置２０は、フレーム１２の上面に鉛
直に設けられた基板２１の正面をチャック２２が昇降す
るものである。チャック２２は、駆動源２３に連結した
ボールねじ軸２４の回動によって上下動される。プリフ
ォーム母材２はチャック２２に把持されて加熱炉１０を
鉛直に貫通する。母材２の軸心は加熱炉１０の通路の軸
心と一致している。The lifting device 20 is a device in which the chuck 22 moves up and down on the front of a substrate 21 provided vertically on the upper surface of the frame 12. The chuck 22 is moved up and down by rotation of a ball screw shaft 24 connected to a drive source 23. The preform base material 2 is gripped by the chuck 22 and vertically passes through the heating furnace 10. The axis of the base material 2 coincides with the axis of the passage of the heating furnace 10.
【００１６】第１の引き取り装置３０は、一対の駆動ロ
ーラ３２と、母材２の外径を計測する外径測定器３１と
で構成される。駆動ローラ３２は、加熱炉１０の下方に
突き出た母材２を挟んで回転する一対のローラである。
各ローラはチェーンベルト３４を介して駆動源３７に連
結されている。駆動ローラ３２は水平方向に往復動する
エアシリンダ３３に取付けられる。外径測定器３１はレ
ーザ外径測定器である。駆動ローラ３２よりも加熱炉１
０側の母材２の外径を測定し、母材２の外径が特定の値
を越えたときに、エアシリンダ３３を動作させて、駆動
ローラ３２を母材２から離間させる仕組みになってい
る。The first take-off device 30 comprises a pair of drive rollers 32 and an outer diameter measuring device 31 for measuring the outer diameter of the base material 2. The drive roller 32 is a pair of rollers that rotate with the base material 2 protruding below the heating furnace 10 therebetween.
Each roller is connected to a drive source 37 via a chain belt 34. The drive roller 32 is attached to an air cylinder 33 that reciprocates in the horizontal direction. The outer diameter measuring device 31 is a laser outer diameter measuring device. Heating furnace 1 rather than drive roller 32
The outer diameter of the base material 2 on the 0 side is measured, and when the outer diameter of the base material 2 exceeds a specific value, the air cylinder 33 is operated to separate the drive roller 32 from the base material 2. ing.
【００１７】第２の引き取り装置４０は、外径測定器
（レーザ外径測定器）４１、駆動ローラ４２およびエア
シリンダ４３で構成され、前述した第１の引き取り装置
３０と同一の構成である。第２の引き取り装置４０は、
第１の引き取り装置３０の下方に配置される。The second pickup device 40 is composed of an outer diameter measuring device (laser outer diameter measuring device) 41, a driving roller 42 and an air cylinder 43, and has the same configuration as that of the first pickup device 30 described above. The second collection device 40
It is arranged below the first take-up device 30.
【００１８】この装置は以下のように使用する。駆動源
２３を作動して昇降装置２０のチャック２２を上方へ移
動する。エアシリンダ３３・４３を作動させて駆動ロー
ラ３２同士および駆動ローラ４２同士の間隔を開いてお
く。母材２の端部をチャック２２で把持して鉛直に吊り
下げ、昇降装置２０に取付ける。母材２の一端にはダミ
ー棒３、もう一端にはダミー棒４が接続してあり、チャ
ック２２にはダミー棒３が把持される。チャック２２を
降下して母材２を加熱炉１０内へ導いてゆき、加熱炉１
０の下方に突き出たダミー棒４の先端が駆動ローラ３２
よりも下方に達した時点で昇降装置２０を停止し、エア
シリンダ３３を作動して駆動ローラ３２でダミー棒４を
挟持する。This device is used as follows. The drive source 23 is operated to move the chuck 22 of the lifting device 20 upward. By operating the air cylinders 33 and 43, the intervals between the drive rollers 32 and between the drive rollers 42 are increased. The end of the base material 2 is gripped by the chuck 22, suspended vertically, and attached to the lifting device 20. A dummy bar 3 is connected to one end of the base material 2 and a dummy bar 4 is connected to the other end, and the chuck 22 holds the dummy bar 3. The base material 2 is guided into the heating furnace 10 by descending the chuck 22, and the heating furnace 1
0 of the dummy rod 4 protruding downward from the drive roller 32.
At the time when the height of the dummy rod 4 is further lowered, the lifting device 20 is stopped, and the air cylinder 33 is operated to hold the dummy rod 4 with the driving roller 32.
【００１９】加熱炉１０に通電して母材２が軟化し始め
たら、昇降装置２０を駆動して母材２全体を緩やかに降
下させるとともに、駆動ローラ３２を回転させて母材を
鉛直下方に引き取り、延伸を開始する。駆動ローラ３２
による引取り速度は、予め定めた延伸倍率に基いて設定
する。ダミー棒４の先端が駆動ローラ４２よりも下方に
達したらエアシリンダ４３を作動し、図２に示すように
駆動ローラ４２をダミー棒４に圧接および回転させ、駆
動ローラ３２と等速で母材２を鉛直下方に引き取る。When the heating furnace 10 is energized and the base material 2 begins to soften, the elevator 20 is driven to slowly lower the entire base material 2 and the driving roller 32 is rotated to lower the base material vertically. Take over and start stretching. Drive roller 32
Is set based on a predetermined stretching ratio. When the leading end of the dummy rod 4 is lower than the driving roller 42, the air cylinder 43 is operated, and the driving roller 42 is pressed against the dummy rod 4 and rotated as shown in FIG. 2 is taken vertically downward.
【００２０】母材２が太径な場合、その延伸が開始され
た部分に団子状の膨らみ２ａが生じることがある。ダミ
ー棒４が下方に引き取られ、膨らみ２ａが駆動ローラ３
２に接近すると、外径測定器３１が母材２の外径変化を
検知し、エアシリンダ３３が作動して駆動ローラ３２を
母材２から離間させる。母材２は駆動ローラ４２の駆動
力のみで引き取られ、膨らみ２ａは駆動ローラ３２に接
触することなく下方へ移動してゆく（図３参照）。膨ら
み２ａが駆動ローラ３２間を通過した後、駆動ローラ３
２はエアシリンダ３３の作用により再度母材２に圧接さ
れ、図４のように駆動ローラ４２とともに引き取り動作
を行なう。When the base material 2 has a large diameter, a dumpling-like swelling 2a may be formed at a portion where the stretching is started. The dummy rod 4 is pulled downward, and the bulge 2a is
2, the outer diameter measuring device 31 detects a change in the outer diameter of the base material 2, and the air cylinder 33 operates to move the drive roller 32 away from the base material 2. The base material 2 is pulled only by the driving force of the driving roller 42, and the bulge 2a moves downward without contacting the driving roller 32 (see FIG. 3). After the bulge 2a passes between the drive rollers 32, the drive roller 3
2 is pressed against the base material 2 again by the action of the air cylinder 33, and performs a take-off operation together with the drive roller 42 as shown in FIG.
【００２１】延伸がさらに進行し、膨らみ２ａが引き取
り装置４０に接近すると、外径測定器４１が母材２の外
径変化を検知してエアシリンダ４３を作動させ、図５の
ように駆動ローラ３２が母材２から離間される。母材２
は駆動ローラ３２の駆動力のみで引き取られ、膨らみ２
ａは駆動ローラ４２に接触することなく下方へ移動す
る。膨らみ２ａが駆動ローラ４２の間を通過した後、駆
動ローラ４２は図６のように再度母材２に圧接され、駆
動ローラ３２とともに引き取り動作を行なう。When the expansion further proceeds and the bulge 2a approaches the take-up device 40, the outer diameter measuring device 41 detects a change in the outer diameter of the base material 2 and activates the air cylinder 43, as shown in FIG. 32 is separated from the base material 2. Base material 2
Is taken up only by the driving force of the driving roller 32 and the bulge 2
a moves downward without contacting the drive roller 42. After the bulge 2a has passed between the drive rollers 42, the drive roller 42 is again pressed against the base material 2 as shown in FIG.
【００２２】このように母材２に膨らみ２ａが生じた場
合でも、膨らみ２ａの移動に合わせて駆動ローラ３２や
駆動ローラ４２を退避させており、膨らみ２ａが駆動ロ
ーラ３２や駆動ローラ４２に接触することがない。その
ため、母材２は常に鉛直方向へ等速で引き取られ、湾曲
のない光ファイバ用プリフォーム母材２が得られる。こ
の延伸装置を用いて直径９０mm、長さ１０００mmの母材
２を、直径３５mm、長さ６６００mmに延伸したところ、
延伸された母材２の湾曲は僅か０．２mmであった。Even when the bulge 2a occurs in the base material 2 as described above, the drive roller 32 and the drive roller 42 are retracted in accordance with the movement of the bulge 2a, and the bulge 2a comes into contact with the drive roller 32 and the drive roller 42. Never do. Therefore, the preform 2 is always drawn in the vertical direction at a constant speed, and an optical fiber preform preform 2 having no curvature is obtained. When a base material 2 having a diameter of 90 mm and a length of 1000 mm was stretched to a diameter of 35 mm and a length of 6600 mm using this stretching apparatus,
The curvature of the stretched base material 2 was only 0.2 mm.
【００２３】[0023]
【発明の効果】以上、詳細に説明したように本発明の光
ファイバ用プリフォーム母材延伸装置は、駆動ローラを
プリフォーム母材の直線部分のみに圧接、回転して引き
取るため、大径な光ファイバ用プリフォーム母材も湾曲
することなく延伸することが可能である。As described in detail above, the optical fiber preform preform stretching apparatus of the present invention presses, rotates, and pulls the drive roller only to the linear portion of the preform preform, so that it has a large diameter. The optical fiber preform preform can also be stretched without bending.
【図１】本発明を適用する光ファイバ用プリフォーム母
材延伸装置の正面図である。FIG. 1 is a front view of an optical fiber preform preform stretching apparatus to which the present invention is applied.
【図２】本発明を適用する光ファイバ用プリフォーム母
材延伸装置の動作を説明する概略工程図である。FIG. 2 is a schematic process diagram illustrating the operation of an optical fiber preform base material stretching apparatus to which the present invention is applied.
【図３】本発明を適用する光ファイバ用プリフォーム母
材延伸装置の動作を説明する概略工程図である。FIG. 3 is a schematic process diagram illustrating the operation of an optical fiber preform preform stretching apparatus to which the present invention is applied.
【図４】本発明を適用する光ファイバ用プリフォーム母
材延伸装置の動作を説明する概略工程図である。FIG. 4 is a schematic process diagram illustrating the operation of an optical fiber preform preform stretching apparatus to which the present invention is applied.
【図５】本発明を適用する光ファイバ用プリフォーム母
材延伸装置の動作を説明する概略工程図である。FIG. 5 is a schematic process chart for explaining the operation of an optical fiber preform preform stretching apparatus to which the present invention is applied.
【図６】本発明を適用する光ファイバ用プリフォーム母
材延伸装置の動作を説明する概略工程図である。FIG. 6 is a schematic process diagram illustrating the operation of an optical fiber preform preform stretching apparatus to which the present invention is applied.
【図７】従来の光ファイバ用プリフォーム母材延伸装置
の正面図である。FIG. 7 is a front view of a conventional optical fiber preform preform stretching apparatus.
【図８】従来の光ファイバ用プリフォーム母材延伸装置
の動作を説明する概略図である。FIG. 8 is a schematic diagram illustrating the operation of a conventional optical fiber preform preform stretching apparatus.
【図９】従来の光ファイバ用プリフォーム母材延伸装置
の動作を説明する概略図である。FIG. 9 is a schematic diagram illustrating the operation of a conventional optical fiber preform preform stretching apparatus.
【図１０】従来の光ファイバ用プリフォーム母材延伸装
置で延伸された母材の側面図である。FIG. 10 is a side view of a preform drawn by a conventional optical fiber preform preform drawing apparatus.
２は光ファイバ用プリフォーム母材、２ａは膨らみ、２
ｂは湾曲部、３・４はダミー棒、１０は加熱炉、１１は
基台、１２はフレーム、２０は昇降装置、２１は基板、
２２・５３はチャック、２３・３７・５１は駆動源、２
４・５２はボールねじ軸、３０・４０・５０は引き取り
装置、３１・４１は外径測定器、３２・４２・６１は駆
動ローラ、３３・４３はエアシリンダ、３４はチェーン
ベルト、５０は引き取り装置である。2 is a preform base material for optical fiber, 2a is swelling, 2
b is a curved portion, 3 and 4 are dummy bars, 10 is a heating furnace, 11 is a base, 12 is a frame, 20 is a lifting device, 21 is a substrate,
22 and 53 are chucks, 23, 37 and 51 are drive sources, and 2
4 and 52 are ball screw shafts, 30 and 40 and 50 are take-off devices, 31 and 41 are outside diameter measuring devices, 32, 42 and 61 are drive rollers, 33 and 43 are air cylinders, 34 is a chain belt, and 50 is take-off. Device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平沢 秀夫 群馬県安中市磯部２丁目13番１号 信越 化学工業株式会社精密機能材料研究所内 (58)調査した分野(Int.Cl.6，ＤＢ名) C03B 37/00 - 37/16 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideo Hirasawa 2-3-1 Isobe, Annaka-shi, Gunma Shin-Etsu Chemical Co., Ltd. Precision Functional Materials Research Laboratories (58) Field surveyed (Int. Cl. 6 , DB Name) C03B 37/00-37/16
Claims (1)
熱炉の通路を鉛直に貫通した光ファイバ用プリフォーム
母材の上端部を把持して昇降可能な昇降装置が配置さ
れ、加熱炉の下方に、プリフォーム母材の側面に圧接回
転して鉛直下方に引き取る一対の駆動ローラと、該駆動
ローラよりも加熱炉側のプリフォーム母材の外径を計測
する外径測定器とからなる引き取り装置がプリフォーム
母材の進路に沿って複数組配置され、前記駆動ローラは
各引き取り装置毎にプリフォーム母材から離間可能であ
ることを特徴とする光ファイバ用プリフォーム母材延伸
装置。An elevating device capable of gripping and raising and lowering an upper end of an optical fiber preform base material vertically penetrating a passage of the heating furnace is disposed above a heating furnace having a vertical passage. Below, a pair of drive rollers that rotate by pressing against the side surface of the preform base material and pull vertically downward, and an outer diameter measuring device that measures the outer diameter of the preform base material closer to the heating furnace than the drive rollers. A plurality of take-off devices are arranged along the path of the preform preform, and the drive roller can be separated from the preform preform for each take-off device. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24133891A JP2952863B2 (en) | 1991-09-20 | 1991-09-20 | Preform preform stretcher for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24133891A JP2952863B2 (en) | 1991-09-20 | 1991-09-20 | Preform preform stretcher for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0578139A JPH0578139A (en) | 1993-03-30 |
| JP2952863B2 true JP2952863B2 (en) | 1999-09-27 |
Family
ID=17072819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24133891A Expired - Fee Related JP2952863B2 (en) | 1991-09-20 | 1991-09-20 | Preform preform stretcher for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2952863B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69739984D1 (en) * | 1996-12-09 | 2010-10-21 | Shinetsu Chemical Co | A method and apparatus for making a glass preform for optical fibers by drawing a preform |
| US5968221A (en) * | 1997-04-28 | 1999-10-19 | Corning, Incorporated | Method of controlling the diameter of a fiber preform including forming a gob on the end and pulling the gob |
| JP3504479B2 (en) * | 1997-11-17 | 2004-03-08 | 信越化学工業株式会社 | Glass base material stretching equipment |
| EP1242323B1 (en) * | 1999-12-29 | 2017-02-22 | Prysmian S.p.A. | A method for producing a core rod to be used in a process for producing a final preform |
| JP5398026B2 (en) * | 2011-03-02 | 2014-01-29 | 信越化学工業株式会社 | Glass base material stretching method and apparatus |
| JP5582583B2 (en) * | 2012-01-19 | 2014-09-03 | 信越化学工業株式会社 | Glass base material stretching method and stretching apparatus |
| JP5528488B2 (en) | 2012-02-09 | 2014-06-25 | 信越化学工業株式会社 | Optical fiber preform drawing method |
| JP5674160B2 (en) * | 2012-05-02 | 2015-02-25 | 信越化学工業株式会社 | Drawing method of glass base material |
| CN105347663B (en) * | 2015-11-30 | 2017-12-22 | 中天科技精密材料有限公司 | The extension method and its equipment of a kind of preform |
-
1991
- 1991-09-20 JP JP24133891A patent/JP2952863B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0578139A (en) | 1993-03-30 |
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