JP2681405B2 - Optical fiber cable and method of manufacturing optical fiber cable - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of an optical fiber cable, and more particularly, to an optical fiber cable capable of miniaturizing a core material having a spiral groove for accommodating an optical fiber core wire, and an optical fiber core. The present invention relates to a method for manufacturing an optical fiber cable in which an optical fiber core wire is reliably inserted and accommodated in a spiral groove for accommodating a wire.

Technical Background A cross section of a conventional structure of an optical fiber cable is shown in FIG. In FIG. 1, an optical fiber element wire composed of a clad glass layer having a refractive index higher than that of the core glass and a silicone protective layer covering the outer circumference of the core glass that serves as an optical transmission line, and a nylon ( The outer diameter of the optical fiber core wire 1 covered and protected by a synthetic resin such as a commercial product), polyethylene, or polycarbonate is about 0.5 mm to 0.9 mm. This optical fiber core wire 1 needs to be protected against pulling, lateral pressure, bending, etc. When a plurality of bundles are bundled to form a cable, as shown in FIG. It is loaded and housed in a groove formed on the outer periphery of a core material 3 made of a synthetic resin molded body such as nylon or polycarbonate around the tension member 2 of a reinforced synthetic resin rod (FRP). The concave groove is a spiral groove 4 having a spiral shape in the lengthwise direction. In FIGS. 1 and 2, eight grooves are formed, and a state in which the optical fiber core wire 1 is housed in three of the grooves is shown. However, the numbers of the optical fiber core wire 1 and the spiral groove 4 can be set appropriately. A tape 5 made of synthetic resin such as nylon or polyester is spirally wound around the outer periphery of the core material 4 in which the optical fiber core wire 1 is loaded and accommodated in the spiral groove 4, and the outer periphery is further made of polyethylene, vinyl chloride, polyurethane. It is coated with a synthetic resin cable jacket 6 to protect the inside from environmental and mechanical influences. In this way, the optical fiber cable 7 is formed.

However, according to the above-mentioned conventional optical fiber cable 7, the synthetic resin molded body is extruded and molded to form the spiral groove 4 for accommodating the optical fiber core wire 1, and this molded body has a tensile force at the time of laying. It is necessary to provide a tension member 2 having a large diameter and high tensile strength in the central part in order to withstand the above-mentioned problems, and as a result, the outer diameter of the optical fiber cable 7 becomes large and the weight per unit length becomes large. There was a point.

Further, since the bottom of the spiral groove 4 is square to improve the manufacturability, the space between the adjacent spiral grooves 4 is appropriately required, and the inside of the spiral groove 4 has a margin for the optical fiber core wire 1. Also, since the pressure from the outside is prevented from being applied to the optical fiber core wire 1, there is a problem that the outer diameter of the optical fiber cable 7 becomes large as described above.

Next, a method of manufacturing the conventional optical fiber cable 7 will be described with reference to FIG. 3. The long core material 3 having the tension member 2 therein is a cylindrical core material having disc-shaped edges on both sides. It is wound around the winding frame 8, from which the end portion of the core material 3 is pulled out, conveyed linearly in the direction of the arrow, and wound around the other winding frame 9. An optical fiber core wire charging device 10 and a tape winding device 11 in the moving direction are arranged in a straight portion of the core material 3 between the core material winding frame 8 and the winding winding frame 9. The optical fiber core wire charging device 10 has a plurality of arms 14 attached to a main body 13 which is rotationally driven by an electric motor 12, and a core wire winding in which a long optical fiber core wire 1 is wound at the tip of the arm 14. Each frame 15 is rotatably attached.

The optical fiber core wire 1 is pulled out from each core wire winding frame 15 and inserted into the spiral groove 4 of the core material 3. Although the spiral groove 4 is omitted in FIG. 3, it is formed in the state shown in FIG. Looking at the twist pitch of the single spiral groove 4, a rotation speed corresponding to the advance speed of the twist is given to the main body 13 of the optical fiber core insertion device 10. In this manner, the core winding frame 15 is rotated around the core material 3 and the optical fiber core wire 1 is fed out, and is sequentially loaded and accommodated in the spiral groove 4 of the core material 3.

The tape winding device 11 arranged at the front position where the optical fiber core wire 1 is loaded includes a tape winding frame 16 that rotates around the core material 3 from a tape winding frame 16 that rotates an electric motor that drives a rotating device (not shown), such as nylon or polyester. The synthetic resin tape 5 is spirally wound tightly around the outer periphery of the core material 3 so that the optical fiber core wire 1 inserted and protected so as not to escape. In this way, the cable jacket 6 is coated in the next step.

According to the conventional method for manufacturing an optical fiber cable,
Even though the moving speed of the core material 3 and the rotation speed for loading the optical fiber core wire 1 into the spiral groove 4 are detected and controlled so as to coincide with each other, mutual minute speed fluctuations and the tape 5 There is a problem that the optical fiber core wire 1 deviates without being accurately inserted into the spiral groove 4 due to the twisting fluctuation of the core material 3 due to the winding resistance force.

The above problem becomes more serious as the diameter of the optical fiber cable 7 becomes smaller.

DISCLOSURE OF THE INVENTION In view of the above problems of the prior art, it is a first object of the present invention to realize a reduction in diameter of an optical fiber cable and to insert as many optical fiber cores as possible. A second object is not to impair the tensile strength of the core material. A third object of the present invention is to provide a method of manufacturing an optical fiber cable that allows the optical fiber core wire to be inserted into the spiral groove of the core material accurately regardless of the form of the core material.

According to the present invention, the high-tensile strength synthetic resin fibers are densely bundled, impregnated with the synthetic resin, and provided with the optical fiber core wire accommodating spiral groove (25) along the outer peripheral length direction. Core material (22) having a synthetic resin coating layer (24) covering the outer peripheral surface of the body (23) and the bundled body including the spiral groove.
And the optical fiber core wire (2
1) and an outer sheath (27) covering the outer periphery of a core material in which the above-mentioned optical fiber core wire is housed in a spiral groove, thereby achieving an optical fiber cable.

According to the first aspect, it may be provided that a tension member of a metal wire or a fiber-reinforced synthetic resin rod-shaped body is inserted in a longitudinal direction at a central portion of the core material.

According to a second aspect, the bottom portion of the spiral groove of the core material may have a semicircular cross section.

According to a third aspect, the synthetic resin coating layer may be formed as an adhesion layer on the outer peripheral surface including the spiral groove.

According to the fourth aspect, the synthetic resin coating layer may be formed on the outer peripheral surface including the spiral groove together with the permeation layer in which the surface of the focusing body is impregnated with resin.

According to a fifth aspect, the synthetic resin coating layer comprises a strip-shaped synthetic resin thin plate along the lengthwise direction on the outer peripheral surface including the spiral groove, densely covering the same, and fusion-bonding the ends in the widthwise direction. It can be done.

Further, in the present invention, in order to achieve the above-mentioned object, the core material having the optical fiber core wire-holding spiral groove formed along the outer peripheral length direction is conveyed and moved in the length direction, and the optical fiber core wire is provided in the spiral groove. Is a method of manufacturing an optical fiber cable which is inserted while rotating about an axis of the optical fiber and covers an outer circumference of a core material in which the optical fiber core wire is inserted, wherein the optical fiber core wire is inserted into a spiral groove. A core material pressing device which has a portion fitted in the spiral groove in the vicinity of the portion to be rotated in accord with the rotation of the optical fiber core wire, and the optical fiber core is held by the core material pressing device while pressing the bias of the core material during the moving movement. There is provided a method of manufacturing an optical fiber cable, characterized in that a wire is inserted into the spiral groove.

According to the first aspect, it can be applied that the portion of the core material pressing device that fits into the spiral groove is a plurality of rotatable rotating bodies.

According to the second aspect, it can be applied that the core material is formed by synthetic resin molding.

According to the third aspect, it is applied that the core material is formed of a synthetic resin mold, and a tension member of a metal wire or a fiber-reinforced synthetic resin rod-shaped body is inserted in the central portion in the longitudinal direction. Can be done.

According to the fourth aspect, it can be applied that the core material is formed of a bundle of high tensile strength synthetic resin fibers and a synthetic resin coating layer covering the outer peripheral surface of the bundle.

According to the fifth aspect, it can be applied that the synthetic resin coating layer is formed as an adhesion layer on the outer peripheral surface including the spiral groove.

According to the sixth aspect, it can be applied that the synthetic resin coating layer is formed on the outer peripheral surface including the spiral groove together with the permeation layer in which the surface of the focusing body is impregnated with the resin.

According to the seventh aspect, the synthetic resin coating layer comprises a strip-shaped synthetic resin thin plate along the lengthwise direction of the outer peripheral surface including the spiral groove, which is densely covered and the end portions in the widthwise direction are fusion-bonded to each other. It can be applied that.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional optical fiber cable, FIG. 2 is a cross-sectional view of only the core material of FIG. 1, and FIG. 3 is a schematic for explaining a conventional method of manufacturing an optical fiber cable. FIG. 4 is a sectional view showing the first embodiment of the optical fiber cable of the present invention, FIG. 5 is a sectional view showing the second embodiment of the optical fiber cable of the present invention, and FIG. The side view of the core material which comprises the optical fiber cable of invention, FIG. 7 is sectional drawing which shows the 1st Example of the core material which comprises the optical fiber cable of this invention, FIG. 8 comprises the optical fiber cable of this invention. FIG. 9 is a sectional view showing a second embodiment of the core material, FIG. 9 is a sectional view showing a third embodiment of the core material forming the optical fiber cable of the present invention, and FIG. 10 is a view showing the optical fiber cable of the present invention. For explaining the first embodiment of the manufacturing method of the core material FIG. 11 is a schematic configuration diagram for explaining a second embodiment of a method for manufacturing a core material constituting an optical fiber cable of the present invention, and FIG. 12 is a strip-shaped thin plate forming a synthetic resin coating layer. FIG. 13 is a partial perspective view, FIG. 13 is a schematic configuration diagram for explaining a method for manufacturing an optical fiber cable of the present invention, FIG. 14 is a front view of a core material holding device applied to FIG. 13, and FIG. BB sectional drawing of a figure.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 4 shows a sectional view of an optical fiber cable of the present invention. In FIG. 4, an optical fiber core wire 21 is composed of a core glass serving as an optical signal transmission path in a central portion, a clad glass layer having a higher refractive index than the core glass around the core glass, and a silicone protective layer covering the outer circumference thereof. Fig. 1 shows that the diameter of the outer diameter is about 0.5 mm to 0.9 mm, which consists of an optical fiber consisting of a wire and the outer circumference of which is covered and protected by a synthetic resin such as nylon, polyethylene, or polycarbonate. Is the same as.

The core material 22 is formed by tightly bundling long high-tensile strength synthetic resin fibers (for example, aromatic polyamide fiber, trade name Kevlar) to form a spiral groove 25, and at the same time spiraling the outer peripheral surface of the focusing body 23. By covering the groove 25 with the synthetic resin coating layer 24, four spiral grooves 25 for accommodating the optical fiber core wire are formed at 90-degree intervals along the outer peripheral length direction of the core material 22.

Four optical fiber core wires 21 are loaded in the spiral groove 25 of the core material 22, and a tape 26 made of synthetic resin such as nylon or polyester is spirally wound around the outer circumference thereof, and further the outer circumference thereof is covered with polyethylene, The optical fiber cable 20 is formed by covering with a cable jacket 27 made of a synthetic resin such as vinyl chloride or polyurethane.

Since the bottom of the spiral groove 25 of the core material 22 is a semicircle and accommodates the optical fiber core wire 21 with a slight margin, it is directly attached to the optical fiber core wire 21 against the pressing force from the outside of the optical fiber cable 20. This pressing force is prevented from acting. Since the bottom of the spiral groove 25 is semi-circular, it is possible to make the intervals of the spiral groove 25 close to each other, and the optical fiber cable 20 can be made thin. Alternatively, it is possible to accommodate more optical fiber cores. Since the internal stress is not concentrated at the bottom of the semicircle, the mechanical strength of the core material 22 is increased, and as a result, a larger number of high tensile strength synthetic resin fibers can be compressed and formed at high density.

Looking at only one spiral groove 25 of the core material 22, the lead L corresponding to the spiral pitch is usually set to about 100 mm to 500 mm as shown in FIG. 6, but the thickness of the core material 22 is
It is determined according to the allowable bending radius of the optical fiber core wire 21.

Here, the mechanical strengths of the aromatic polyamide fiber (high tensile strength synthetic resin fiber), steel wire and FRP (fiber reinforced synthetic resin), which are the materials of the bundle 23, are shown in Table 1.

As described above, the high-tensile-strength synthetic resin fiber bundle is strong against a tensile force and has a large resistance, so that the elongation of the completed optical fiber cable 20 is suppressed, and thus the accommodated optical fiber. The tensile force is not applied to the core wire 21, and the optical fiber core wire is sufficiently protected.

Since the core material 22 is formed by compressing fibers at high density, even if a pressing force is applied to the optical fiber cable 20 from the radial direction, the optical fiber transmission state of the optical fiber core wire 21 is affected. Does not give rise to deformation.

The bending strength of the optical fiber cable 20 is almost determined by the core material 22.
Since is made of high tensile strength synthetic resin fiber, it has appropriate flexibility and is easy to work on the reel.

Further, in the present invention, the synthetic resin coating layer (24) is further provided on the outer peripheral surface of the bundle as described above, which is a high-density bundle of the high tensile strength synthetic resin fibers constituting the bundle. Further strengthening and smoothing the surface of the bundle including the inner surface of the spiral groove facilitates the insertion of the optical fiber core into the spiral groove and makes the optical fiber core uneven within the spiral groove. No contact pressure or damage.

That is, the bundle in the present invention is a high-density bundle of high tensile strength synthetic resin fibers, and the fibers are in a state of strong pressure contact with each other. For this reason, it is difficult to sufficiently penetrate the resin between the fibers when the synthetic resin for compression molding is impregnated into the fiber, and the surface of the compression-molded bundle is exposed on the surface of the high tensile strength synthetic resin fiber. It has an uneven shape. In particular, the uneven surface in the spiral groove makes it difficult to smoothly insert the optical fiber core wire into the spiral groove, and the inserted optical fiber core wire surface contacts the uneven surface of the spiral groove. This is because the contact pressure will be non-uniform and will be damaged. However, such a problem will be solved as described above by the synthetic resin layer further formed on the surface of the bundle.

A second embodiment of the optical fiber cable of the present invention is shown in a sectional view in FIG. In FIG. 5, an optical fiber cable
20-1 is a high tensile strength piano wire, a high tensile strength stainless steel wire or other metal single core wire or stranded wire, or glass fiber, carbon fiber in the central portion of the bundle 23 of high tensile strength synthetic resin fibers,
A tension member (28) made of a fiber-reinforced synthetic resin rod (FRP) made of high tensile strength synthetic resin fiber is inserted without increasing the core material (22). Tension member 28
Optical fiber cable 21
-1 can have high strength.

As described above, the optical fiber cable 20 according to the present invention,
No. 20-1 has achieved weight reduction and diameter reduction, and its mechanical strength is sufficiently ensured. For example, assuming that the tensile strength of an optical fiber cable is 100 kg, the diameter of the outer diameter was 10 mm and the weight was 80 (gr / m) in the past. 2 (4 mm to 6 mm) and the weight could be reduced to 1/5 or less.

A first embodiment of the manufacturing method of the core material according to the present invention will be described with reference to the sectional view of FIG. In FIG. 7, the heartwood
22 is a high-strength synthetic resin fiber of long length (for example, aromatic polyamide fiber, trade name Kevlar) is bundled in a high density, and in order to bind these fibers and to fix the shape after molding, for example, It is impregnated with nylon, polyethylene, etc. to form it by compression. At this time, the portion to be the spiral groove 25 is also formed. In this way, the focusing body 23 is formed. Next, a synthetic resin and a synthetic resin adhesive are brought into close contact with the outer peripheral surface including the spiral groove 25 by heat press molding to form the synthetic resin coating layer 24. This ensures a relatively strong shape. A synthetic resin such as nylon or polypropylene is applied to the coating layer 24.

Similarly, regarding the mode of manufacturing the core material,
This will be described with reference to the sectional view of the drawing. In FIG. 8, the core material 22-
In No. 1, a large number of high tensile strength synthetic resin fibers are bundled in a high density, and in order to bind these fibers and harden them so that the shape after molding is not broken, for example, nylon or polyethylene is impregnated with the throat and compression formed. At this time, the portion to be the spiral groove 25 is also formed. In this way, the bundle 23-1 is formed. Next, nylon on the outer peripheral surface including the spiral groove 25,
A synthetic resin of the same type as that impregnated with polyethylene or the like is heated and melted to form the synthetic resin coating layer 24-1, thereby integrally forming an impregnated layer impregnated with the resin.

Similarly, regarding the manufacturing method of the core material, the third embodiment
This will be described with reference to the sectional view of the drawing. In FIG. 9, the core material 22
2 is a spiral groove 25 of the focusing body 23 obtained in the same manner as in FIG.
The belt-shaped synthetic resin thin plate is heated and softened and wound around the outer peripheral surface including, and is brought into close contact with the focusing body 23, and the widthwise end portion 24-
A is overlapped and fusion-bonded. In this way, the synthetic resin coating layer 24-2 is formed. The belt-shaped synthetic resin thin plate is a spiral groove 25
It is wound along the spiral direction of.

FIG. 10 is a schematic block diagram for explaining the first embodiment of the manufacturing method for manufacturing the core material constituting the optical fiber cable of the present invention. In FIG. 10, the core material manufacturing device 30 is
A large number of long, high tensile strength synthetic resin fibers 23-S
It is wound around 31 and is sequentially drawn out from this fiber winding frame 31, focused through the holes of the concentrator plate 32, and introduced into the first extrusion molding machine 33.

Inside the first extrusion injection machine 33, for example nylon,
The fiber bundle is impregnated with polyethylene or the like to compress the fiber bundle at a high density, and the portion to be the spiral groove is also formed. The spiral groove portion of the converging member 23 thus formed is in the same linear state as the length direction. Then, it is introduced into the second extrusion molding machine 34. Inside the second extrusion molding machine 34, synthetic resin such as nylon or polypropylene including a spiral groove is adhered to the outer peripheral surface of the introduced focusing body 23 by heat press molding to form a synthetic resin coating layer. The whole is twisted and twisted into a spiral groove. The twisting is performed by rotating a core material winding frame 37 for winding the core material 22 by a speed control type electric motor 38, and rotating the whole core material winding frame 37 by an electric motor 39 so as to twist and rotate the core material 22. The core material 22 discharged from the second extrusion molding machine 34 is cooled and hardened by passing through the cooling tank 35 in which the cooling liquid 36 circulates in a twisted state.

FIG. 11 is a schematic block diagram for explaining the second embodiment of the manufacturing method for manufacturing the core material constituting the optical fiber cable of the present invention. In FIG. 11, the core material manufacturing device 40 is
A large number of long, high tensile strength synthetic resin fibers 23-S
It is wound around 41, is sequentially drawn out from this fiber winding frame 41, is focused through the holes of the concentrator 42, and is introduced into the extrusion molding injection machine 43.

Inside the extrusion molding injection machine 43, for example, nylon, polyethylene or the like is impregnated to compress the fiber bundle at a high density, and a portion to be a spiral groove is also formed. The spiral groove portion of the converging member 23 thus formed is in the same linear state as the length direction. Next, it is introduced into the heat fusion machine 45. This heating and fusing machine 45 is equipped with a belt-shaped synthetic resin thin plate 24 at the same time.
-P is drawn out from the thin plate winding frame 44 and introduced, and is internally heated and softened so as to be wound around and closely adhered to the outer peripheral surface of the focusing body 23, and end portions in the width direction are overlapped and fusion-bonded.

In this way, the synthetic resin coating layer is formed and twisted in its softened state to form a spiral groove. The twisting is performed by rotating the core material winding frame 46 for winding the core material 22 by the speed control type electric motor 47, and rotating the whole core material winding frame 46 by the electric motor 48 so as to twist and rotate the core material 22.
Of course, the core material 22 discharged from the heat fusion machine 45 is cooled and hardened by providing a cooling tank similar to that shown in FIG. The synthetic resin thin plate 24-P may be a corrugated synthetic resin thin plate 24-W having concave grooves that match the spiral grooves of the focusing body as shown in FIG.

FIG. 13 is a schematic configuration diagram for explaining a method for manufacturing an optical fiber cable of the present invention. In FIG. 13, the core material 22 having a plurality of optical fiber core wire accommodation spiral grooves formed on the outer peripheral surface along the lengthwise direction is a cylindrical core material winding frame 51 having disc-shaped edges on both sides. It has been wound, and heartwood 22
Is drawn out, conveyed linearly in the direction of the arrow, and wound up on the other winding reel 59. Heartwood reel 51
An optical fiber core wire charging device 52 and a tape winding device 60 in the moving direction are arranged in a straight line portion of the core material 22 between the winding core 59 and the winding reel 59. A plurality of arms 55 are attached to a main body 53 that is driven to rotate by an electric motor 54 in the optical fiber core insertion device 52, and a core winding formed by winding a long optical fiber core 21 at the tip of the arm. Each frame 56 is rotatably attached. A core material holding device 70 is attached to the main body 53.

The optical fiber core wire 21 is pulled out from each core wire winding frame 56 and inserted into the spiral groove 25 of the core material 22. Although not shown in FIG. 13, the spiral groove 25 is formed in the state shown in FIG. As for the twist pitch of one spiral groove 25, a rotation speed corresponding to the advance speed of the twist is applied to the main body 53 of the optical fiber core insertion device 52. In this way, the core winding frame 56 rotates around the core material 22 and sequentially sends out the optical fiber core wire 21 while successively winding spiral grooves of the core material 22.
Charge and store in 25.

The tape winding device 60 arranged at the front position where the optical fiber core wire 21 is loaded is an electric motor for rotating a rotating device (not shown) to rotate the tape winding frame 57 around the core material 22 from nylon, polyester, etc. The synthetic resin tape 58 spirally wraps the outer circumference of the core material 22 in a dense manner to protect the optical fiber core wire 21 inserted therein so as not to escape. In this way, the coating of the cable jacket 27 is applied in the next step.

Next, a side sectional view of FIG. 15 showing a front view of FIG. 14 and a cross section taken along line BB of FIG. 14 of the core material holding device 70 attached to the main body 53 of the optical fiber core wire charging device 52. Explained by. In the figure, reference numeral 22 is a core material, a circular recess 72 is formed inside the box-shaped main body frame 71 that penetrates the core material 22, and a circular through hole 73 is formed in the bottom surface. The cylindrical roller support frame 74 fitted in the recess 73 of the main body frame 71 has four roller support arms 75 protruding inward in the radial direction.
Is integrally formed, the shaft 76 is fitted in a shaft hole that penetrates the support arm 75 in the direction parallel to the paper surface, and the rotating roller 77 having a tapered peripheral tip penetrates the shaft 76 and is rotatable by the shaft 76. It is supported.

The four tapered tip portions around the rotary roller 77 are fitted in the four spiral grooves 25 of the core member 22, respectively, and the rotary roller 77 is rotated by the movement of the core member 22.

A pressing plate 79 is the same size as the main body frame 71, has a through hole 80 in the center, and is screwed and fixed to the main body frame 71 with screws 81 at the four corners.

The relationship between the body frame 71 and the roller support frame 74 is such that the roller support frame 74 is rotatable with respect to the recess 72 while the four screws 81 are loosened and the holding plate 79 is floated, as shown in FIG. When the screws 81 are tightened in this way, both end faces of the roller support frame 74 are
It is pressed between the inner end surface of the recess 71 and the inner surface of the holding plate 79, and is fixed to the main body frame 71 so as not to rotate.

The operation of the core material pressing device 70 having the above structure will be described. The main body frame 71 is fixedly fixed to the main body 53 of the optical fiber core insertion device 52. As described above, the core wire winding frame 56 that rotates integrally with the main body 53 rotates around the core material 22 under speed control so as to match the twist accompanying the movement of the spiral groove of the core material 22. At the same time, the core material pressing device 70 also rotates in conformity with the main body 52. Here, when a twist variation in the rotational direction occurs in the core material 22 and an attempt is made to generate a relative position error between the core winding frame 56 and the spiral groove 25, the rotation engaged with the spiral groove 25 is being performed. The roller 77 suppresses fluctuations and regulates so as not to cause a position error. That is, the core material is pressed so as not to change in the rotational direction, and the optical fiber core wire 21 to be inserted is synchronously fixed to the position of the spiral groove 25, or the optical fiber core wire 21 deviates without being inserted into the spiral groove 25. Will disappear.

Explaining the first setting, in the core material 22 extending between the core material reel 51 and the winding frame 59, the tip of the optical fiber core wire 21 is inserted and fixed in the spiral groove 25, and the rotation direction of the core wire reel 56. Position of the core material is loosened, the screw 81 of the core material pressing device 70 is loosened to float the pressing plate 79, and the roller support frame 74 is appropriately rotated so that the positional relationship between the spiral groove 25 of the core material 22 and the roller 77 becomes the optimum state. And tightening the screw 81 to fix the roller support frame 74 in that position.

The rotary roller 77 of the core material holding device 70 is not limited to four places, and it is sufficient if there are at least two places at 180 degrees.
There may be three places at intervals. Other than that, the number can be increased, but it is preferable to provide them at uniform positions.

The position of the core material pressing device 70 is not limited to the position shown in FIG. 13, and may be located at a charging position including the vicinity before and after the optical fiber core wire 21 is charged into the spiral groove 25. . In this case, as shown in FIG. 14 and FIG. 15, a guide groove 78 is formed around the tip of the rotary roller 77, and the optical fiber core wire 21 is brought into contact with the guide groove 78 to make the insertion more reliable. be able to.

Although not clearly shown in the drawing, the rotation roller 77 is inclined together with the roller support arm 75 so that the direction thereof coincides with the spiral direction of the spiral groove 25. The main body frame 71, the roller support frame 74, etc. are made of synthetic resin or light alloy.

Although the rotating member is used as the core material pressing device in the above embodiment, the rotating member is not necessarily limited to the rotating roller in the present invention, and it also includes a sliding sliding member that engages with the spiral groove. It is also possible to apply a nut-shaped member that is screwed into.

INDUSTRIAL APPLICABILITY The method for manufacturing an optical fiber cable of the present invention is applied to an optical fiber cable having a core material including those shown in FIGS. 1, 2, 4, and 5 and having other spiral grooves. It goes without saying that you will get it.

As described above, according to the present invention, an optical fiber cable having a small diameter and high strength can be obtained, and a stable optical fiber core wire can be loaded into the spiral groove of the core material in the production of the optical fiber cable.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-28704 (JP, A) JP-A-56-19007 (JP, A) Actually opened 60-96613 (JP, U) Actual-opened Sho 62- 149012 (JP, U)

Claims (14)

(57) [Claims] 1. A high-tensile synthetic resin fiber is bundled at a high density,
A synthetic body impregnated with the optical fiber core wire accommodating spiral groove (25) along the outer peripheral length direction, which is compression molded, and a composite covering the outer peripheral surface of the converging body including the spiral groove. The core material (22) having a resin coating layer (24), the optical fiber core wire (21) loaded and housed in the spiral groove, and the outer periphery of the core material having the optical fiber core wire housed in the spiral groove. An optical fiber cable, which comprises an outer jacket (27). 2. The optical fiber according to claim 1, wherein a tension member (28) made of a metal wire or a fiber-reinforced synthetic resin rod is inserted in the center of the core material (22) in the longitudinal direction. cable. 3. The optical fiber cable according to claim 1, wherein the bottom of the spiral groove (25) of the core has a semicircular cross section. 4. The fiber optic cable according to claim 1, wherein the synthetic resin coating layer (24) is formed as an adhesion layer on the outer peripheral surface including the spiral groove (25). 5. The synthetic resin coating layer (24) is formed with a permeation layer impregnated with resin on the surface of the outer peripheral surface converging body (23) including the spiral groove (25). Through 3
The optical fiber cable according to any one of 1. 6. The synthetic resin coating layer (24) has a strip-shaped synthetic resin thin plate along the lengthwise direction on the outer peripheral surface including the spiral groove (25) and closely covers the ends in the width direction by fusion bonding. The optical fiber cable according to any one of claims 1 to 3, wherein: 7. The core material (22) having the optical fiber core wire accommodation spiral groove (25) formed along the outer peripheral length direction is conveyed and moved in the longitudinal direction to the spiral groove (25). 21) A method for manufacturing an optical fiber cable in which 21) is inserted while rotating it about the axis of the core material, and the outer circumference of the core material 22 in which the optical fiber core wire 21 is inserted is covered. hand,
A core material pressing device having a portion fitted into the spiral groove near the portion where the optical fiber core wire (21) is inserted into the spiral groove (25) and rotating in synchronization with the rotation of the optical fiber core wire (21). (70)
The optical fiber core wire (21) is provided with a spiral groove (2) while pressing the bias of the core material (22) during conveyance movement by the core material pressing device.
5) A method for manufacturing an optical fiber cable, which is characterized in that the optical fiber cable is charged. 8. The method of manufacturing an optical fiber cable according to claim 7, wherein a portion of the core material pressing device (70) fitted into the spiral groove is a plurality of rotatable rotors (77). 9. The method of manufacturing an optical fiber cable according to claim 7, wherein the core material (22) is formed by synthetic resin molding. 10. The core material (22) is formed by synthetic resin molding, and a tension member (28) of a metal wire or a fiber reinforced synthetic resin rod is inserted in the central portion in the longitudinal direction. The method of manufacturing an optical fiber cable according to claim 7. 11. The core material (22) comprises a bundle of high tensile strength synthetic resin fibers (23) and a synthetic resin coating layer (24) covering the outer peripheral surface of the bundle. The method for manufacturing an optical fiber cable according to claim 7. 12. The method for producing an optical fiber cable according to claim 11, wherein the synthetic resin coating layer (24) is formed as an adhesion layer on the outer peripheral surface including the spiral groove (25). 13. The synthetic resin coating layer (24) is formed on the outer peripheral surface including the spiral groove (25) together with a permeation layer obtained by impregnating the surface of the focusing body with a resin.
11. A method for manufacturing an optical fiber cable as described in 11. 14. The synthetic resin coating layer (24) has a belt-shaped synthetic resin thin plate along the lengthwise direction on the outer peripheral surface including the spiral groove (25) so as to densely cover the end portions in the width direction by fusion bonding. 12. The method for manufacturing an optical fiber cable according to claim 11, wherein: