JPH0664220B2 - Optical fiber cable manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline of the Invention] A plurality of tape-shaped optical fibers are respectively attached to the outer circumference of a core body from individual optical fiber supply reels through individual assembling dies corresponding to the individual optical fiber supply reels. It is supplied to the spiral groove provided, and by each assembly die, each tape-shaped optical fiber is inserted and assembled from different positions in the same groove to prevent the optical fiber array from being disturbed and excessively extended. A method of manufacturing a spacer-type tape-shaped optical fiber cable which makes it difficult for distortion and compression strain to occur, stabilizes the transmission characteristics of the optical fiber, and reduces the deterioration of the breaking life.

[Industrial application field]

The present invention relates to a method for manufacturing an optical fiber cable, and more particularly to a method for manufacturing a spacer type optical fiber cable in which a plurality of tape-shaped optical fibers are assembled and housed in a spiral groove provided on the outer circumference of a core.

[Conventional technology]

FIG. 3 is a diagram for explaining a manufacturing process of a conventional method for manufacturing an optical fiber cable of this type. The core body 1 is fed while the supply drum 11 and the winding drum 15 rotate together. On the other hand, a plurality of tape-shaped optical fibers, in this example, four tape-shaped optical fibers 3-1 to 3-4 are respectively supplied to the supply reel 12
-1 to 12-4, and is collectively inserted and assembled in the same groove of the core body 1 by the assembly die 13 via the guide roller 16. The core body 1 in which the optical fibers 3-1 to 3-4 are assembled is
The press winding 4 is applied by the tape winding head 14 and wound on the winding drum 15.

That is, conventionally, when a plurality of tape-shaped optical fibers of this type are housed in the groove of the core body having a groove on the outer circumference, a plurality of optical fibers are collectively inserted at one insertion position via the guide roller.・ Meeting.

[Problems to be solved by the invention]

In the conventional method of inserting the optical fibers into the grooves, the optical fibers are likely to be disordered in the pass line until they are inserted, and there is a risk of the optical fibers being inserted into the grooves in the disordered arrangement. Also, even in the pass line near the insertion position, multiple optical fibers come into contact with each other, and frictional resistance works,
Since the optical fibers are inserted into the groove in equal lengths, the optical fiber inserted inside the groove is compressed, and the optical fiber located outside is in danger of being elongated. There is.

[Means for solving problems]

In order to solve the conventional problems, the present invention provides a plurality of tape-shaped optical fibers each from an individual optical fiber supply reel,
It is characterized in that it is supplied to individual collecting dies corresponding to the optical fiber supply reels, and each collecting die inserts and collects each tape-shaped optical fiber in the same groove from different positions.

[Action]

In the manufacturing method of the present invention, since the insertion positions of the optical fibers in the same groove are different for each sheet, there is no replacement of the optical fibers in the path line until the insertion, and the array disorder is less likely to occur, and the optical fibers 1 Since the pass line is different for each sheet, there is no friction between the optical fibers, and it is possible to prevent the optical fiber from being subjected to expansion / contraction strain. This will be described below with reference to the drawings.

〔Example〕

A sectional structure of an example of an optical fiber cable manufactured according to the present invention is shown in FIG. A plurality of tape-shaped optical fibers 3 are layered in the groove 6 of the core body 1 having the tensile strength body 2 in the center and the spiral groove 6 provided on the outer periphery, and the tape surface is opposed to the center of the core body 1. The core body 1 is provided with a press winding 4 on its outer periphery, and a jacket 5 is further provided on its outer periphery.

FIG. 1 is a diagram for explaining a manufacturing process of an embodiment of the manufacturing method of the present invention. In the present embodiment, the case where the plurality of tape-shaped optical fibers has four threads is illustrated. The tape-shaped optical fibers 3-1 to 3-4 are different from the supply reels 12-1 to 12-4, respectively, and are individually different from each other in the supply reels 12-1 to 12-4.
Are supplied to the collecting dies 13-1 to 13-4 arranged in correspondence with each other, and are different in the same groove of the core body 1 supplied from the supplying drum 11 by different collecting dies 13-1 to 13-4. After being inserted / assembled from the position, the tape winding head 14 applies a press winding 4 to the outer periphery, and the tape is wound around a winding drum 15 that is interlocked with the supply drum 11.

The supply reel may be installed according to the number of grooves provided in the core and the number of tape-shaped optical fibers accommodated in the grooves.

〔The invention's effect〕

As described above, according to the present invention, the array disorder of the optical fibers is prevented, and the excessive expansion strain and the compression strain with respect to the optical fibers housed in the groove are less likely to occur, thus stabilizing the transmission characteristics of the optical fibers. In addition, the effect is great such that the deterioration of the life due to fracture is reduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a manufacturing process of the present invention, FIG. 2 is a sectional structure of an optical fiber cable manufactured by the present invention, and FIG. 3 is a diagram illustrating a manufacturing process of a conventional manufacturing method. 1 ... Core body 2 ... Tensile strength body 3,3-1 to 3-4 ... Tape-shaped optical fiber 4 ... Presser winding 5 ... Outer cover 6 ... Groove 11 ... Supply drum 12-1 to 12- 4 ... Supply reel 13,13-1 to 13-4 ... Assembling die 14 ... Tape winding head 15 ... Winding drum 16 ... Guide roller

Front page continuation (72) Inventor Kazuo Hokari, Tokai-mura, Naka-gun, Ibaraki Prefecture 162 Shirahone, Shirahane, Nippon Telegraph and Telephone Corporation, Ibaraki Telecommunications Research Institute (72) Yutaka Katsuyama, Tokai-mura, Naka-gun, Ibaraki Prefecture 162 Shirakuji, Shirane, Nippon Telegraph and Telephone Corporation, Ibaraki Telecommunications Research Institute

Claims (1)

[Claims] 1. A method for manufacturing an optical fiber cable, comprising a plurality of tape-shaped optical fibers inserted into the groove of a core body having a tensile strength member at the center and a spiral groove provided on the outer periphery, A plurality of tape-shaped optical fibers are supplied from respective individual optical fiber supply reels to individual collective dies corresponding to the optical fiber supply reels, and by the respective collective dies, each tape-shaped optical fiber is provided with the groove. A method for manufacturing an optical fiber cable, which comprises inserting and assembling from different positions in the same groove.