JPH08211260A - Overhead optical cable and its manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an aerial optical cable with a simple structure and easy to manufacture. [Structure] Messenger wire 11 and optical cable 12
Are slackened together, and these are intermittently fixed by the bind wires 13. In order to manufacture this, the optical cable 12 is wound around the large-diameter first take-up capstan 15 and the messenger wire 11 is wound around the small-diameter second take-up capstan 16 so that the optical cable 12 has a slack and is attached to the messenger wire 11. Then, the bind wire 13 is wound and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial optical cable mainly used in an outdoor wiring system of an optical fiber communication network and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as this type of overhead optical cable, a pre-hanger type as shown in FIG. 3 is generally used.
In FIG. 3, reference numeral 1 is a support line, and the support line 1
Is a support wire body 1a such as a galvanized steel stranded wire covered with a covering material 1b such as polyethylene, and the support wire 1 is laid on a telephone pole or the like.

On this supporting wire 1, a large number of hanger parts 2 ...
The optical cable 3 is suspended along the support line 1 via the. The hanger portion 2 has a gourd-shaped cross section and is made of synthetic resin such as polyethylene. The support wire 1 is penetrated and fixed to the upper part of the hanger portion 2, and the optical cable 3 is penetrated and fixed to the lower part thereof. In addition, the hanger portion 2 is provided with respect to the support line 1 and the optical cable 3.
The optical cable 3 is provided at a predetermined interval,
At this interval between the hanger portions 2, ..., The support wire 1 is fixed with sufficient slack.

In such a pre-hanger type aerial optical cable, since the optical cable 3 has a slack with respect to the support wire 1, a tensile force or a tensile force is applied to the optical cable 3 at the time of aerial installation. It is not subject to distortion.

However, this prehanger type aerial optical cable has the following problems in its manufacture, and its solution is desired. That is, since the hanger portion 2 is formed by the injection molding method, after the long supporting wire 1 and the optical cable 3 are housed in the molding die, the molding die is closed and molten polyethylene or the like is injected into the molding die to melt it. After the polyethylene and the like are cooled and solidified, the molding die is opened to take out the integrally molded product, so that it takes a long time to mold the hanger portions 2 ..., and there is a drawback that the manufacturing efficiency is extremely low.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain an overhead optical cable which can be manufactured easily and efficiently.

[0007]

[Means for Solving the Problems] This problem is caused by accommodating a messenger wire with an optical cable slackened.
This can be solved by adopting a structure in which these are intermittently fixed with bind lines. In addition, the messenger wire is wound around the large-diameter first take-up capstan, the optical cable is wrapped around the small-diameter second take-up capstan, and these two capstans are simultaneously rotated so that the optical cable sags against the messenger wire. It can be manufactured by a method of attaching with a binding wire and fixing with a bind wire.

Hereinafter, the present invention will be described in detail. Figure 1
An example of the overhead optical cable of this invention is shown, and the code | symbol 11 in a figure is a messenger wire. The messenger wire 11 is a steel stranded wire formed by twisting a plurality of galvanized steel wires, etc., covered with a synthetic resin such as polyethylene. The optical cable 12 is attached to the messenger wire 11 in a slack state, and the messenger wire 11 and the optical cable 12 are intermittently and periodically in contact with each other at a certain interval. The binding wire 13 is wound around and fixed.

Messenger wire 1 of optical cable 12
1 means that the length of the optical cable 12 is 0.1 to 0. 1 in proportion to the length 1 of the messenger wire 11.
It is in the range of 5%. The distance between the fixing points where the optical cable 12 is fixed to the messenger wire 11 with the bind wire 13 is in the range of 20 to 80 cm. Further, the optical cable 12 is not particularly limited, but for example, a multi-core structure in which a laminated optical tape unit in which a plurality of optical fiber ribbons are laminated is accommodated in a slot of a slot rod is used.

Next, a method for manufacturing such an overhead optical cable will be described. FIG. 2 shows an example of this manufacturing method, in which reference numeral 14 is a double capstan. In this double capstan 14, a first take-up capstan 15 having a large diameter and a second take-up capstan 16 having a smaller diameter than that are fixed to the same rotary drive shaft 17, respectively. The two take-up capstan 16 and the two take-up capstan 16 are simultaneously rotated at the same rotation speed.

The small diameter second of the double capstan 14
The messenger wire 11 is attached to the take-up capstan 16.
However, an optical cable 1 is attached to the large diameter first take-up capstan 15.
2 are respectively wound, taken up from a take-up drum (not shown), and sent out in the direction of the arrow in the figure.

Further, a bind wire winding machine is installed in the latter stage of the double capstan 14. This binding wire winding machine has two flying drums 18, 18 on which the binding wire 13 has been wound in advance. The flying drums 18, 18 are messenger wires 11 respectively.
It is attached to a large rotary drum (not shown) that passes through the optical cable 12 and the optical cable 12, and when the rotary drum rotates, it revolves around the messenger wire 11 and the optical cable 12 as the center of rotation while rotating around the bind line 1.
3, the messenger wire 11 and the optical cable 12 are wound around the bind wire 13.

Regarding the messenger wire 11 and the optical cable 12 which are simultaneously sent out from the double capstan 14, the diameter of the first take-up capstan 15 to which the optical cable 12 is sent out is larger than the diameter of the second take-up capstan 16 to which the messenger wire 11 is sent out. Since the length of the optical cable 12 is also large, the sending length of the optical cable 12 per the same number of rotations becomes long, so that the optical cable 12 is bent with respect to the messenger wire 11 as shown in FIG. Messenger wire 11 intermittently
Come into contact with.

Then, the flying drums 18 and 18 wind the bind wire 13 around the portion where the optical cable 12 and the messenger wire 11 are intermittently contacted with each other to continuously manufacture the overhead optical cable as shown in FIG. be able to. And the slack of the optical cable 12 is
It can be arbitrarily adjusted by appropriately changing the ratio of the diameter of the first take-up capstan 15 and the diameter of the second take-up capstan 16.

The structure of such an overhead cable is extremely simple, and since the optical cable 12 is suspended with sufficient slack with respect to the messenger wire 11, it is possible to install the overhead cable. An excessive external force does not act on the optical cable 12 during the work. Further, in the manufacturing, by using the double capstan 14 shown in FIG. 2, it is possible to easily, continuously and efficiently manufacture at low cost.

[0016]

As described above, according to the aerial optical cable of the present invention, the optical cable can be suspended with respect to the messenger wire with a sufficient structure due to its simple structure, and it can be installed. It is highly reliable because no excessive external force is applied during work. Further, with this structure, it is possible to manufacture with high manufacturing efficiency using simple equipment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an overhead optical cable of the present invention.

FIG. 2 is a schematic perspective view showing an example of a method of manufacturing an overhead optical cable of the present invention.

FIG. 3 is a perspective view showing an example of a conventional overhead optical cable.

[Explanation of symbols]

11 ... Messenger wire, 12 ... Optical cable, 13
... Binding wire, 14 ... Double capstan, 15 ... First
Pick-up capstan, 16 ... Second pick-up capstan, 18
… Flying drum

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Suehiro Miyamoto 1440 Rokuzaki, Sakura City, Chiba Fujikura Ltd. Sakura Factory

Claims (2)

[Claims] 1. An aerial optical cable, characterized in that a messenger wire is attached to an optical cable in a slack state, and these are intermittently fixed by a bind wire. 2. A double capstan in which a large-diameter first take-up capstan and a smaller-diameter second take-up capstan are coaxially mounted, and an optical cable is attached to the first take-up capstan, and a second take-up capstan is used. The messenger wire is wrapped around each, the double capstan is rotated, the optical cable and the messenger wire are sent out in a state where the optical cable is slack with respect to the messenger wire, and both are intermittently fixed by the bind wire. Manufacturing method of aerial optical cable.