JPS6075811A - Production of optical fiber cable - Google Patents

Abstract

PURPOSE:To prevent the deterioration in characteristic owing to cabling by leading continuously an assemblage of tape cores which are superposed above and below into an open type plastic pipe having an open part, closing the open part to constitute a tape unit and twisting largely and aggregating plural pieces of such units. CONSTITUTION:A central tension member 50, a delivery bobbin 51 for said member and delivery bobbins 52 for tape cores 10 are provided. For example, four pieces of the bobbins 52 are made into one set and are respectively attached on a common shaft 53. The tape cores are superposed into four upper and lower steps by an aggregating die 54 to form a core assemblage 55. The bobbins 52 and the die 54 rotate in the same direction synchronously with the rotation of a winder 88 to apply 100% untwisting to the assemblage 55. An open type pipe 56 is delivered from a delivery bobbin 58 and the assemblage 55 is inserted therein through an open part 560. The assemblage 55 enters the open type pipe 56 while receiving the untwisting. The pipe 56 is made into a through pipe- shaped sheath in the place of a forming die 60 and a tape 62 and a tape 62 for retaining winding is wound thereon and a unit 26 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an optical 7-IPA cable in which a plurality of tape core wires are stacked vertically to form a unit, and such units are assembled by a plurality of individuals. It is something.

Prior Art (Figs. 1 to 3) The process of making the units 26 and the process of assembling the units 26 in large pieces were performed separately.

[FIG. 1J is an explanatory diagram of unitization.

10 is a tape core, which is made up of multiple fiber elements f! as shown in Figure 2. 12 are lined up in a row horizontally, and a cover a14 is placed on top of them all at once.

For example, t pieces of such tape core wire 10 are stacked one on top of the other and sent out. Then, a laminate aluminum tape 16 is butt-molded around it through a 7-ohm 18 and a molding die 20, and a polyethylene sheath 24 is applied thereon by an extruder 22 to form a unit 26 (FIG. 2).

Then, the unit 26 is passed through a cooling funnel 28 and a take-up device 30, and is once wound up on a wind-up device 62.

Then, the above units 26 are assembled by a plurality of individuals to make a cape/l/42.

"Fig. 3" is an explanatory diagram thereof. 64 is a sending device of the unit 26, 66 is a dividing plate, 6th is a collecting die, 40 is a taping device, 42 is a finished cable, 44 is a take-up device, and 46 is a winding device. These are of the normal delivery rotation type, and the unit 26 is delivered while applying a 100% twist.

The conventional problem is that it does not rely on the four overlapping tape core wires 10. Then, a laminated aluminum tape 16 and a polyethylene sheath 24 are placed thereon and wound up by a winding device 62. Therefore, when it is wound up by the winding device 62, it is so-called flat-width, that is, the central axis 4 in FIG.
8 (parallel to the wide surface 100 of each tape core 10).

Therefore, the length of the winding radius is different between the inner tape core wire 10 and the outer tape core wire 10. Therefore, there is a surplus in the length of the inner tape core 10, and the inner tape core 10 moves outward to absorb the surplus. Note that the tape core wire 10 is loosely contained within the polyethylene sheath 24 and can be easily moved to the outside. In the process, a complicated bend occurs in the inner tape core wire 10.

Next, the unit 26 having such tape core wires 10 is twisted, and at that time each tape core wire 10 is returned straight again. At that time, the inner tape core wire 10 which had been bent also tries to return to its original shape. However, at that time, all the tape cores were completely unbent @io
will not return. Since friction acts between each tape core 100, some tape cores 10 completely return to their original state, while other tape cores 10 may newly generate complicated bends. The remaining bend increases the loss of the optical fiber cable, resulting in variations in the loss of the fiber cable.

Purpose and outline of the invention: The purpose of i/ is to create a cable without sacrificing the high quality of the optical fiber at the strand stage.

As mentioned above, once the unit 26 is wound up on the winding device 32, this is the cause of the increase in loss. Considering this point, the unit forming and twisting and assembling processes were performed in tandem without winding up the unit 26. Note that when the polyethylene sheath 24 is processed by the extruder 22 as described above,
Since the speed of breaking cans is slow and it is difficult to keep up with the speed of other processes, special I
The sheath was applied using a Jim pipe 56.

Example (No. 5, Fig. 5) In "Fig. 5", 50 is the central tension member;
1 is its delivery bobbin.

52 is a delivery bobbin for the tape core wire 10.

These are, for example, a set of 1,000 pieces, each mounted on a common shaft 56. Therefore, the tape fibers 10 are fed out almost in parallel at first, but the collecting die 5
At point 4 el, as shown in FIG. 2, the core wires overlap in upper and lower stages to form a core wire assembly 55. Although not shown, a suitable guide may be inserted between the delivery bobbin 52 and the collecting die 54 so that the tape cores 10 are vertically stacked neatly.

The delivery bobbin 52 and the collecting die 54 are rotated in the same direction in accordance with the rotation of the winding device 88 to give the core wire assembly 55 a twist of 700%.

56 is an open pipe made of polyethylene, for example.
58 is its delivery bobbin. This open type pipe 56
The opening part 5 is continuous in the longitudinal direction, as shown in the Rij figure.
60, and when a force is applied to it in the direction of arrow 562 so that the open part 560 disappears, it becomes a pipe shape, which becomes a sheath as described later.

The circular type vibrator 56 is continuously sent out, and the spread part 56
Tape core wire assembly 55 overlapping the above-mentioned Hirodan through 0
bring it inside. At this time, as described above, the tape fiber assembly 55 enters the open type vibrator 56 while being twisted. However, the open pipe 56 is not twisted (this point will be discussed later).

The open pipe 56 has an open section 5 at the forming die 60.
60 closes to form a complete pipe-like sheath. Then, on top of that, a pressure winding tape 62 is fed out from a delivery bobbin 64.
is wound to form the unit 26.

The above operations are performed in parallel to create multiple units 26 of the same poem. In order to avoid clutter, only two units (26) are shown in the "Figure 1".

Thereafter, the cable 42 is made using the same equipment as the conventional winding and rotating large twisting equipment.

That is, each unit 26 is passed through a set of six wire plates 66 and twisted together using a large twisting die 68. Then, the core love tape 70 that is fed out from the feed-out bobbin 72 is placed vertically on top of it, passed through a 7-ohm 7417 ohming die 76, and the presser winding thread 78 that is fed out from the feed-out reel 80 is further wound on top of it, and the cable 42 shall be.

The cable 42 is passed through the larger auxiliary caterpillar 82, the larger cradle 84, and the torrent shaft 86, and then wound into the winding device 88.

Furthermore, the winding section after the auxiliary caterpillar 82 rotates and leans on the unit 26.

Regarding other embodiments (1) Although the single twist twisting method is shown above, a double twist F twisting method can also be considered in order to increase the speed. (2) As described above, the open pipe 56 I haven't put much effort into it. This is done to simplify the device. Even if the open pipe 56 is not bent, if the fiber assemblies 55 of the tape core wires 10 inside are bent, when gathered together, the plurality of fiber assemblies 55 will be A force is exerted on each other to pull the center tension member I (50) toward the center tension member I (50), and the force of the snow prevents the open pipe 56 from untwisting.

However, it is not a constituent feature of this invention that the open pipe 56 is not twisted, but only the fiber assembly 55 of the tape core wire 10 is twisted.
There may be cases in which the twisting is applied to both the core wire assembly 55 and the twisting is applied to the open pipe 56 only.

(3) The arrangement of the delivery bobbin 52 may be a tandem type as shown in "Fig. 1". However, it is more convenient to place them on the same axis 53 as shown in "Figure 3" (
It becomes easier to move sideways).

Effects of the invention (1) Since the polyethylene sheath 24 of the unit 26 is formed using the J vibe 56, the molding speed can be increased compared to the conventional extruder 22.
Therefore, it is possible to tandem with the larger process.

Therefore, it is no longer necessary to wind the unit 26 on the winding device 62 as described above, and problems such as bending of the tape core wire 10 caused by winding and an increase in transmission loss due to this are eliminated. The extent to which the characteristics of the line 12 are impaired by cabling is greatly reduced.

(2) Manufacturing speeds up by tandem unit formation and sizing processes.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of the prior art, and FIG. 1 is an explanatory diagram of the unitization process. FIG. 2 is an enlarged cross-section of C1 at n-1. FIG. 3 is an explanatory diagram of the strand assembly process, FIG. Fiber wire 24: Polyethylene sheath 26z unit t42: Entire cable 52
: Delivery bobbin 54: Collection die 55: Core wire assembly 56: Open type pipe 560: Open part 60: Forming die 62: Presser winding tape 68: Large twisting die 70: Core wrap tape 7th: Presser winding thread patent application Person: Fujikura Electric Cable Hayashi Company Representative, Nippon Telegraph and Telephone Public Corporation Person: National Affairs Keiji

Claims (1)

[Claims] (/) A step of continuously sending out a plurality of tape core wires and overlapping them one above the other; and then closing the opening to form a tape core unit; and tying together a plurality of units configured in the same manner as described above. A method for manufacturing an optical fiber cable. (,2) The optical fiber according to claim 1, characterized in that 100% twisting is applied to the overlapped tape fiber assembly, and no twisting is applied to the open part vibe. Cable manufacturing method. (3) The optical fiber according to claim 1 or 2, characterized in that the plurality of tape core wires are sent out from a plurality of delivery bobbins attached side by side on the same axis. Method of manufacturing fiber cable.