JPH06157078A - Device coating core wire of beltlike optical fiber with resin - Google Patents

Abstract

PURPOSE:To prevent occurrence of unevenness by continuously supplying plural core wires of optical fiber made in a row by a nipple to a resin feed part, uniformly extruding a resin from plural resin feed paths to the outside of the plural core wires of optical fiber while controlling the resin amount and coating. CONSTITUTION:Plural core wires 120 of optical fiber are successively supplied to an inlet 42 of core wires of optical fiber, made in a row at an outlet 43 of optical fiber of a nipple 4 and traveled in a beltlike state. Then the outer periphery of the core wires 120 of optical fiber made in a row is coated with an UV curing resin such as acrylate resin in a flow rate controlled by resin flow rate control devices 9, 10, 11 and 12 from resin feed paths 22, 23, 24 and 25 at a resin feed part 21. The core wires 120 of optical fiber coated with the resin and made in a row are passed through a guide passageway 32 and a communicating die hole 31 and thickness of the coating resin is determined to give core wires 180 of beltlike optical fiber uniformly coated with the resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin coating device for a belt-shaped optical fiber core wire, which coats a plurality of optical fiber element wires in a band-like state with a resin.

[0002]

2. Description of the Related Art Generally, an optical fiber is formed by heating and melting an optical fiber preform in an electric furnace or the like and pulling it. The optical fiber spun by being pulled out from the electric furnace, after the thermosetting resin is primarily coated,
The thermosetting resin is introduced into a drying oven where the primary coating thermosetting resin is dried. After that, it is wound on a winding drum and used as an optical fiber element wire.

Since such an optical fiber is remarkably different in physical or mechanical characteristics from the conventional copper conductor, a primary coating, a secondary coating and the like are applied so that the optical fiber is mechanically treated. The characteristics and ease of handling are improved. However, in the case of making a cable, if a large external force such as lateral pressure is applied to the optical fiber core wire, a slight bending (microbending) occurs in the optical fiber core wire, which increases transmission loss. Need to be considered. In consideration of this point, there is a band-shaped optical fiber core wire as a structure of the optical fiber cable.

This band-shaped optical fiber core wire is manufactured by a band-shaped optical fiber core wire manufacturing apparatus 100 as shown in FIG. That is, a plurality of (for example, four, six, eight, etc.) optical fiber strands 120 supplied from the supply device 110 are supplied to the coating head 140 via the guide member 130. In the coating head 140, a plurality of (for example, four, six, eight, etc.) optical fiber strands 120 arranged side by side are UV-cured with an acrylate resin such as an acrylate salt, an acrylate ester, or an acrylic acid resin. The functional resin 150 is coated (secondary coating) as shown in FIG. After that, UV (ultraviolet)
t) In a resin curing furnace 160 such as a furnace, the thermosetting resin coated on the plurality of optical fiber strands 120 is cured to form a plurality of cores (4 cores, 6 cores, 8 cores, etc.) band-shaped optical fiber cores. 18
0 is manufactured, taken up by the take-up device 190, and taken up by the take-up device 200.

A coating head 140 for coating the belt-shaped optical fiber core wire with resin used in the belt-shaped optical fiber core wire manufacturing apparatus 100 has a structure as shown in FIG. That is, it is composed of a holder 141 formed in a cylindrical shape, a die 142 attached to the holder 141, and a nipple 143.
The die 142 is formed in a cylindrical shape, and has a flange 144 at one end. The die 142 is fitted to the tip of a cylindrical holder 141, and the flange portion 144 of the die 142 is attached to the holder 14 with a bolt.
It is attached to 1.

The nipple 143 is formed in a cylindrical shape and its tip is narrowed in a funnel shape, and the opening shape of the tip is a substantially elliptical shape suitable for bundling a plurality of optical fiber element wires in parallel. Has been formed. A flange portion 147 is provided at the rear end of the nipple 143. The nipple 143 is fitted on the rear end of the cylindrical holder 141, and is attached to the holder 141 with a bolt at the flange of the nipple 143.

Further, on the upper side wall of the holder 141, a resin supply port 1410 for introducing the resin to coat the plurality of optical fiber element wires 120 aligned in parallel by the nipple 143 and bundled into a band is provided. , Holder 1
On the lower side wall of 41, in order to prevent the resin containing air bubbles from coating the plurality of optical fiber element wires 120 bundled in a band, the resin at the start of manufacturing the band-shaped optical fiber core wire is provided. A resin overflow port 1411 for discarding is provided. When the coating resin is introduced from the resin supply port 1410, the holder 141 and the die 1
The inside of 42 is filled with resin.

A plurality of optical fiber strands 120 aligned in parallel by the nipple 143 and bundled in a strip form are
A holder 14 which is located approximately in the center of 2 and is filled with resin
1 and the die 142 are coated with resin when passing through the inside of the die 142, and pulled out from the flange side outlet of the die 142.

[0009]

As described above, when a plurality of optical fiber element wires 120 are aligned in parallel and bundled in a strip shape and coated with a resin collectively, the plurality of optical fiber element wires 120 are run. Since the coating is performed by extrusion, it is necessary to prevent uneven thickness from occurring in the coating resin of the ribbon-shaped optical fiber. In order to prevent the uneven thickness of the coating resin of the belt-shaped optical fiber from being generated, the holder 141,
This is possible by aligning the axes of the die 142 and the nipple 143.

However, in the conventional coating head, the holder 141, the die 142, and the nipple 1
The coaxiality of 43 depends on the processing accuracy of the holder 141, the die 142, and the nipple 143. Therefore, in the conventional coating head, the plurality of optical fiber element wires 120 bundled in a band shape are biased in the thickness direction as shown in FIG. 10 to cover the band-shaped optical fiber element wire 120. There is a problem that uneven thickness occurs in the extruded product. The band-shaped optical fiber core wire 180 in which this uneven thickness is generated
Since the thickness of the resin varies depending on the location, the shrinkage force varies depending on the location when the resin thermally shrinks, causing deformation, which appears as strain of the optical fiber element wire 120. The distortion of the optical fiber element wire 120 causes a slight bending (microbending) in the optical fiber element wire 120, resulting in an increase in transmission loss.

In order to prevent this uneven thickness, the die 14 is strictly
It is necessary to adjust the coaxiality of the nipple 143 and the nipple 143, and it is extremely difficult to adjust the die 142 and the nipple 143 to obtain the coaxiality, and the adjustment is very difficult. Not realistic.

It is an object of the present invention to provide a resin coating device for a belt-shaped optical fiber core wire which can prevent uneven thickness of an extruded product of the belt-shaped optical fiber core wire.

[0013]

In order to achieve the above object, in a resin coating device for a belt-shaped optical fiber core wire of the present invention, a holder formed in a cylindrical shape and one end of the holder are fitted to each other to be continuous. Nipple that supplies a plurality of optical fiber strands that are supplied in parallel with each other in parallel and a resin-coated optical fiber core that is fitted to the other end of the holder and outputs the molded optical fiber. A band-shaped optical fiber comprising a die having a die hole, and a resin supply unit for extruding and supplying resin to the outer circumference of a plurality of parallel optical fiber strands supplied from the nipple at the tip of the nipple inside the holder. A guide passage of a predetermined length that holds and guides the same shape as the outer shape of the resin-coated optical fiber core output from the die hole to the die of the resin coating device for the core wire and communicates with the die hole. Provided, and a plurality of arranged in the holder the resin supply passage for supplying the communicating resin in the resin supply section,
A resin flow rate control device for controlling the flow rate of the resin supplied to each of the resin supply paths is provided to uniformly extrude and coat the outer periphery of the plurality of parallel optical fiber element wires output from the nipple. It is the one.

It is preferable to control the resin flow rate of each resin supply path so that the flow rate of the resin supplied from each resin supply path becomes the same.

Further, it is preferable to control the flow rate of the resin supplied to the resin supply passage by controlling the opening area of the supply port of the resin supplied at a constant pressure.

[0016]

When a plurality of optical fiber strands that are continuously supplied are aligned in parallel and supplied to the optical fiber inlet of the nipple, the plurality of optical fiber strands are aligned in parallel and the resin supply section Is supplied to. In the resin supply unit, an equal amount of resin is supplied from a plurality of resin supply paths at a constant pressure, and the outer circumference of a plurality of parallel optical fiber element wires is covered. The flow rate of the resin coated on the outer periphery of the plurality of parallel optical fiber strands is controlled by the resin flow rate control device provided in each of the resin supply paths. That is, when there is some center misalignment between the die hole and the nipple hole, the flow rate of the resin supplied to the outer periphery of the plurality of optical fiber strands is controlled to make the plurality of parallel optical fiber strands parallel to each other. The whole is moved to the target position by the pressure of the extruded resin. In this way, the parallelized multiple optical fiber strands controlled and coated with resin are in the same shape as the outer shape of the resin coated optical fiber core output from the die hole by the guide passage of the die. It is held and guided to the die hole.

[0017]

EXAMPLES Examples of a resin coating device for a ribbon-shaped optical fiber according to the present invention will be described below. Figure 1
FIG. 3 shows an embodiment of a resin coating device for a strip-shaped optical fiber according to the present invention.

In the figure, reference numeral 1 is a resin coating device for a belt-shaped optical fiber core wire, which is used in a belt-shaped optical fiber core wire manufacturing apparatus 100 shown in FIG. The resin is extruded and coated. The resin coating device 1 is composed of a holder 2 formed in a cylindrical shape, a die 3 attached to the holder 2, and a nipple 4.

The holder 2 is formed in a rectangular block shape and has a die 3 at one end and a nipple 4 at the other end.
Are fitted. Reference numeral 21 denotes a resin supply unit, which supplies the resin to the outer circumferences of the plurality of optical fiber element wires 120 bundled in a band and coats the outer circumferences of the plurality of optical fiber element wires 120 with the resin. Reference numerals 22, 23, 24 and 25 denote resin supply passages provided in the holder 2, which communicate with the resin supply portion 21 and have a circular cross section. The resin supply paths 22, 23, 24 and 25 are tapered toward the center of the holder 2. And this resin supply path 2
Reference numerals 2, 23, 24 and 25 are for supplying the resin coating portion 21 with the coating resin. The resin supply path 22 is above the resin supply section 21, and the resin supply path 23 is the resin supply section 21.
, The resin supply path 24 is provided on the left side of the resin supply section 21, and the resin supply path 25 is provided on the right side of the resin supply section 21 in four directions.

Further, the resin supply pipe 22 is provided in the resin supply passage 22.
Is connected, and a resin flow rate control device 9 is connected to the resin supply pipe 5. A resin supply pipe 6 is connected to the resin supply passage 23, and a resin flow rate control device 10 is connected to the resin supply pipe 6. A resin supply pipe 7 is connected to the resin supply passage 24.
A resin flow rate control device 11 is connected to. A resin supply pipe 8 is connected to the resin supply passage 25, and a resin flow rate control device 12 is connected to the resin supply pipe 8.

The resin flow rate control devices 9, 10, 11, 1
2 is a resin supply passage 2 via resin supply pipes 5, 6, 7, and 8.
The flow rate of the resin supplied to 2, 23, 24, 25 is controlled. That is, specifically, the resin flow rate control devices 9, 10, 11, and 12 control the flow rate of the resin supplied to the resin supply pipes 5, 6, 7, and 8 at a constant pressure (for example, per optical fiber strand). Control is performed to maintain the pressure at 0.1 kg / cm ² . Further, the resin flow rate control devices 9, 10, 11, 12 are
At times, the flow rate of the resin supplied to the resin supply pipes 5, 6, 7, 8 is controlled so that the outer periphery of the plurality of optical fiber element wires 120 bundled in a band is uniformly coated with the resin.

That is, the resin flow rate control devices 9, 10, 1
The control of the flow rate of the resin supplied by 1 and 12 is performed so that the flow rates of the resins supplied from the resin supply paths 22, 23, 24 and 25 are the same. Alternatively, the resin flow rate control device 9, 10, 11, 12 controls the flow rate of the resin to be supplied by controlling the resin supplied from the resin supply device (not shown) at a constant pressure with the resin supply paths 22 and 23. Two
This is performed by controlling the opening area of a valve (not shown) of the resin supply port that feeds to Nos. 4 and 25.

The die 3 is formed in the shape of a rectangular tube, and the holder 2
Is attached to the tip of the, and a substantially elliptical die hole 31 is formed at the substantially center. Reference numeral 32 is a guide passage, which communicates with the die hole 31 and is formed into a cylindrical projection shape.
It has a cross-sectional shape similar to the shape of the die hole 31. The guide passage 32 is fitted in the holder 2. The guide passage 32 is provided in the resin supply section 21.
At the die hole 31
The outer shape of the resin-coated optical fiber core output from is held as it is and guided to the die hole 31. Further, the die 3 is provided with a flange portion 33. The die 3 is fitted on the tip of the rectangular tube-shaped holder 2, and is attached to the holder 2 with a bolt at a flange portion 33 of the die 3.

The nipple 4 is formed in a cylindrical shape and has a tip narrowed in a funnel shape. The opening of the tip has a substantially elliptical shape suitable for bundling a plurality of optical fiber element wires in parallel. Has been formed. A rectangular flange portion 41 is provided at the rear end of the nipple 4. The nipple 4 is fitted to the rear end of the square tube-shaped holder 2, and is attached to the holder 2 with a bolt at a flange portion 41 of the nipple 4. Reference numeral 42 denotes an optical fiber element wire introduction port, which is opened in a circular shape and is formed in a taper shape that becomes thinner toward the inside. A plurality of (in this embodiment, four) optical fiber strands 120 aligned in a row and bundled in a band are supplied to the optical fiber strand inlet 42. . Reference numeral 43 denotes an optical fiber outlet, which is a place where a plurality of optical fiber element wires 120 are aligned in parallel in a strip shape and sent to the resin supply unit 21.

Next, the operation of this embodiment will be described.

First, a plurality of (four in this embodiment) optical fiber core wires 120 are continuously supplied from the supply device 110 to the optical fiber wire inlet 42 of the nipple 4. Along with the supply of the plurality of optical fiber strands 120, the resin is supplied from the resin supply device (not shown) to the resin supply paths 22, 23, 24, 25 at a predetermined pressure. The plurality of optical fiber strands 120 continuously supplied to the optical fiber strand introduction port 42 are arranged in a line at the optical fiber strand outlet port 43 of the nipple 4 and run in a strip state. . The outer circumferences of the plurality of optical fiber strands 120 arranged in parallel at the nipple 4 are covered with the resin supplied from the resin supply passages 22, 23, 24, 25 in the resin supply unit 21. The plurality of parallel optical fiber strands 120 covered with this resin are
The resin is coated with, and the thickness of the coating resin of the plurality of optical fiber strands 120 is determined in the guide passage 31 and the die hole 31, and the outer shape is adjusted.

The band-shaped optical fiber core wire 180 coated with the resin in the die hole 31 is sampled through the guide passage 31, and the uneven thickness of the coating resin of the band-shaped optical fiber core wire 180 is inspected. At this time, when the coating resin of the belt-shaped optical fiber core has uneven thickness, the resin flow control devices 9, 10, 11, 12 cause the resin supply paths 22, 2,
The flow rate of the resin supplied to 3, 24, 25 is controlled. That is, for example, when the amount of resin on the upper side of the band-shaped optical fiber 180 is small, the resin flow rate control device 9 is operated to increase the amount of resin supplied to the resin supply passage 22. This increase in the resin supply amount can be performed by opening the resin supply valve to the resin supply passage 22 of the resin flow rate control device 9. When there is little resin below the strip-shaped optical fiber core wire 180,
Similarly, it can be performed by opening the resin supply valve to the resin supply path 23 of the resin flow rate control device 10. The same can be done when the amount of resin on the left side of the strip-shaped optical fiber core wire 180 is small and when the amount of resin on the right side of the strip-shaped optical fiber core wire 180 is small.

Therefore, according to this embodiment, by operating the resin flow rate control devices 9, 10, 11, 12 to control the flow rate of the resin supplied to the resin supply paths 22, 23, 24, 25, It is possible to position a plurality of optical fiber strands 120 at the center and coat them with a resin.
1 and a plurality of optical fiber strands 120 even if the centers of the optical fiber strand lead-out ports 43 of the nipple 4 are slightly displaced from each other in accuracy.
Can be easily centered. Further, according to the present embodiment, a uniform resin coating can be applied to the plurality of optical fiber strands 120 as shown in FIG.

5 to 6 show another embodiment of the resin coating device for the optical fiber ribbon according to the present invention. In the figure, this embodiment differs from the embodiment shown in FIG. 1 in that the resin supply passages 22, 23, 24, 25 formed in the holder 2 in the embodiment shown in FIG. On the other hand, in the present embodiment, the resin supply paths opened on the left and right sides of the plurality of optical fiber strands 120 arranged in parallel at the nipple 4 are formed in a circular cross-sectional shape, and are arranged in parallel at the nipple 4. A plurality of optical fiber strands 120
That is, the cross-sectional shape of the resin supply path opened on both upper and lower sides is formed in an elliptical cross-section.

That is, reference numeral 220 denotes a resin supply passage provided in the holder 2 and opening upward, and communicates with the resin supply portion 210 and has a substantially elliptical cross section. A resin supply pipe 50 is connected to the resin supply passage 220. Further, 230 is a resin supply path provided in the holder 2 and opening downward, and communicates with the resin supply section 21.
The cross section is formed into a substantially elliptical shape. This resin supply path 23
A resin supply pipe 60 is connected to 0. The opening length of the resin supply paths 220 and 230 is the same as the length of the die hole 31 in the longitudinal direction.

Therefore, according to this embodiment, since the resin supply path 220 opening upward and the resin supply path 230 opening downward are the same width as the optical fiber core wire 180, the resin flow rate is increased. The flow rate of the resin supplied from the control devices 9, 10, 11, 12 to the resin supply pipes 50, 60, 7, 8 is kept constant (for example, 0.1 k per one optical fiber element wire).
The resin can be uniformly coated on the outer peripheries of the plurality of optical fiber strands 120 bundled in a band by performing the control of maintaining the temperature at g / cm ² ).

FIG. 7 shows another embodiment of the resin coating device for the optical fiber ribbon according to the present invention. In the figure, this embodiment is different from the embodiment shown in FIG. 1 in that the embodiment shown in FIG. 1 has a cross-sectional shape in the width direction of a plurality of optical fiber strands 120 arranged in parallel at the nipple 4. While the circular resin supply paths are provided one above and one below, in the present embodiment, a resin supply path having a circular cross section is formed in the width direction of the plurality of optical fiber strands 120 arranged in parallel by the nipple 4. The point is that two upper lines and two lower lines are provided.

That is, 222 and 224 are resin supply passages provided in the holder 2 and opened upward, and communicate with the resin supply portion 215, and are formed in a substantially circular cross section. A resin supply pipe 52 is connected to the resin supply passage 222, and a resin supply pipe 54 is connected to the resin supply passage 224. The resin flow control device 92 is connected to the resin supply pipe 52, and the resin flow control device 9 is connected to the resin supply pipe 54.
4 are connected to each other, and the resin flow rate control device 92
Is controlling the resin flow rate to the resin supply pipe 52, and the resin flow rate control device 94 is controlling the resin flow rate to the resin supply pipe 54.

Further, reference numerals 232 and 234 denote resin supply passages provided in the holder 2 and opening downward, and the resin supply portion 21
5 and has a substantially circular cross section. A resin supply pipe 62 is connected to the resin supply passage 232, and a resin supply pipe 64 is connected to the resin supply passage 234.
The resin flow control device 1 is connected to the resin supply pipe 62.
02 is connected to the resin supply pipe 64 by a resin flow rate control device 104.
Are connected to each other, and the resin flow rate control device 102
Indicates the resin flow rate to the resin supply pipe 62, and the resin flow rate control device 104 controls the resin flow rate to the resin supply pipe 64.

Therefore, according to this embodiment, the resin supply passages 222 and 224 opening upward and the resin supply passages 232 and 234 opening downward are provided side by side in the width direction of the optical fiber 180. Therefore, the flow rate of the resin supplied from the resin flow rate control devices 92, 94, 102, 104, 11, 12 to the resin supply pipes 52, 54, 62, 64, 7, 8 is maintained at a constant pressure (for example, an optical fiber element). 0 for each line.
1kg / cm ² ) By controlling to maintain
The resin can be uniformly coated on the outer circumference of the plurality of optical fiber strands 120 bundled in a band.

It is to be noted that, in FIG. 7, the components having the same numbers as those of the embodiment shown in FIG. 2 represent the same components.

[0037]

Since the present invention is constructed as described above, it has the following effects.

The die is provided with a guide passage of a predetermined length which holds and guides the same shape as the outer shape of the resin-coated optical fiber core output from the die hole and communicates with the die hole. A plurality of resin supply paths for supplying light are provided in the holder, and a resin flow rate control device for controlling the flow rate of the resin supplied to each of the resin supply paths is provided, and a plurality of parallel light beams output from the nipple are provided. Since the resin is uniformly extruded and coated on the outer circumference of the fiber element wire, it is possible to prevent uneven thickness of the extruded product of the band-shaped optical fiber core wire.

Further, the control of the resin flow rate of each resin supply passage is
Since the flow rates of the resins supplied from the respective resin supply paths are the same, it is possible to prevent the occurrence of uneven thickness of the extruded product of the belt-shaped optical fiber core wire.

Further, the control of the flow rate of the resin supplied to the resin supply path is performed by controlling the opening area of the supply port of the resin supplied at a constant pressure so that the strip-shaped optical fiber core wire can be easily controlled. It is possible to prevent uneven thickness of the extruded product.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of a resin coating device for a strip-shaped optical fiber according to the present invention.

FIG. 2 is a cross-sectional view of the resin coating device for the optical fiber ribbon shown in FIG.

FIG. 3 is a vertical cross-sectional view of a resin coating device for the belt-shaped optical fiber core wire shown in FIG.

FIG. 4 is a cross-sectional view of the belt-shaped optical fiber core wire shown in FIG.

FIG. 5 is a partial cross-sectional overall perspective view showing another embodiment of the resin coating device for the strip-shaped optical fiber according to the present invention.

FIG. 6 is a vertical cross-sectional view of the resin coating device for the optical fiber ribbon shown in FIG.

FIG. 7 is a vertical cross-sectional view showing another embodiment of the resin coating device for the ribbon-shaped optical fiber according to the present invention.

FIG. 8 is an overall configuration diagram of a conventional belt-shaped optical fiber core wire manufacturing apparatus.

9 is a cross-sectional view of the entire configuration of the coating die for the strip-shaped optical fiber core wire shown in FIG.

FIG. 10 is a cross-sectional view of an optical fiber tape core wire resin-coated with a conventional coating die for the optical fiber tape core wire.

[Explanation of symbols]

1 ………………………………………………………… Resin coating device 2 ………………………………………………………… Holder 21, 210, 215 …………………………………… Resin supply part 22, 23, 24, 25, 220, 222, 224, 2
30,232 234,240,250 ……………………………… Resin supply path 3 ………………………………………………………… Die 31 …… ………………………………………………… Die hole 32 ………………………………………………………… Guide passage 4 ………… …………………………………………………… Nipple 42 ………………………………………………………… Introducing the optical fiber strand 43 …… ……………………………………………………… Optical fiber wire outlet 5, 6, 7, 8, 50, 52, 54, 60, 62, 64
……………………………………………… Resin supply pipe 9, 10, 11, 12, 92, 94, 102, 104…
…………………………………………… Resin flow controller 120 …………………………………………………… Optical fiber strand 180 ……………… …………………………………………… Optical fiber core

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[Procedure amendment]

[Submission date] June 11, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Generally, an optical fiber is formed by heating and melting an optical fiber preform in an electric furnace or the like and pulling it. The optical fiber spun by being pulled out from the electric furnace is first coated with an ultraviolet (UV) curable resin and then introduced into a resin curing furnace such as a UV irradiation furnace , where the primary coated ultraviolet (UV) A) The curable resin is cured . After that, it is wound on a winding drum and used as an optical fiber element wire.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

The nipple 143 is formed in a cylindrical shape and its tip is narrowed in a funnel shape, and the opening shape of the tip is a substantially elliptical shape suitable for bundling a plurality of optical fiber element wires in parallel. Has been formed. A flange portion 147 is provided at the rear end of the nipple 143. The nipple 143 is fitted to the rear end of the cylindrical holder 141, and is attached to the holder 141 with a bolt at the flange portion 147 of the nipple 143.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

First, a plurality of (four in this embodiment) optical fiber core wires 120 are continuously supplied from the supply device 110 to the optical fiber wire inlet 42 of the nipple 4. Along with the supply of the plurality of optical fiber strands 120, the resin is supplied from the resin supply device (not shown) to the resin supply paths 22, 23, 24, 25 at a predetermined pressure. The plurality of optical fiber strands 120 continuously supplied to the optical fiber strand introduction port 42 are arranged in a line at the optical fiber strand outlet port 43 of the nipple 4 and run in a strip state. . The outer circumferences of the plurality of optical fiber strands 120 arranged in parallel at the nipple 4 are covered with the resin supplied from the resin supply passages 22, 23, 24, 25 in the resin supply unit 21. The plurality of parallel optical fiber strands 120 covered with this resin are
The resin is coated with, and the thickness of the coating resin of the plurality of optical fiber wires 180 is determined in the guide passage 32 and the die hole 31, and the outer shape is adjusted.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

5 to 6 show another embodiment of the resin coating device for the optical fiber ribbon according to the present invention. In the figure, this embodiment differs from the embodiment shown in FIG. 1 in that the resin supply passages 22, 23, 24, 25 formed in the holder 2 in the embodiment shown in FIG. On the other hand, in the present embodiment, the resin supply paths opened on the left and right sides of the plurality of optical fiber strands 120 arranged in parallel at the nipple 4 are formed in a circular cross-sectional shape, and are arranged in parallel at the nipple 4. A plurality of optical fiber strands 120
The cross-sectional shape of the resin supply passage opened on both the upper and lower sides of is substantially elliptical.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

That is, reference numeral 220 denotes a resin supply passage provided in the holder 2 and opening upward, and communicates with the resin supply portion 210 and has a substantially elliptical cross section. A resin supply pipe 50 is connected to the resin supply passage 220. Reference numeral 230 denotes a resin supply path that is provided in the holder 2 and opens downward, and is in communication with the resin supply section 210 and has a substantially elliptical cross section. A resin supply pipe 60 is connected to the resin supply passage 230. The opening length of the resin supply paths 220 and 230 is the same as the length of the die hole 31 in the longitudinal direction.

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (3)

[Claims] 1. A cylindrical holder, a nipple that fits into one end of the holder and that continuously supplies a plurality of optical fiber strands arranged in parallel, and a holder for the holder. A plurality of parallel optical fiber elements supplied from the nipple to the tip of the nipple, and a die having a die hole that is fitted to the other end to mold the resin-coated optical fiber into a predetermined shape and output In a resin coating device for a band-shaped optical fiber core wire, which is provided with a resin supply unit for pushing resin to the outer circumference of the wire inside the holder, the resin-coated optical fiber core wire output from the die hole to the die A guide path of a predetermined length that holds and guides the same shape as the outer shape and communicates with the die hole is provided, and a plurality of resin supply paths that communicate with the resin supply section and supply the resin are provided in the holder. A resin flow rate control device for controlling the flow rate of the resin supplied to each of the supply paths was provided to uniformly extrude and coat the outer circumference of the plurality of parallel optical fiber element wires output from the nipple. A resin coating device for a strip-shaped optical fiber, which is characterized in that 2. The control of the resin flow rate of each resin supply passage is
The resin coating device for a strip-shaped optical fiber core according to claim 1, wherein the flow rates of the resins supplied from the respective resin supply paths are made uniform. 3. The strip shape according to claim 2, wherein the control of the flow rate of the resin supplied to the resin supply path is performed by controlling the opening area of the supply port of the resin supplied at a constant pressure. Resin coating equipment for optical fiber cores.