JPS60180408A - Method of disconnecting coating of cable and tool therefor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cable coating dismantling method and a tool used for stripping the coating of an optical cable used in optical communications, etc. .

[Background technology and its problems]

Optical cables used as transmission lines for optical communications are provided with several coating layers around the optical fiber core in order to protect the fragile optical fiber core made of stone-covered glass or the like.

FIG. 1 is a cross-sectional view showing an example of such an optical cable, in which 1 is an optical fiber core through which laser light etc. is transmitted, 2 is a protective layer that protects the aggregate of the optical fiber cores 1 (optical fiber unit), 3 is a tensile strength wire spirally wound around the outer periphery of the protective layer 2, and 4 is a metal coating layer made of copper, aluminum, etc. arranged around the outer periphery to fix the tensile strength wire 3 and protect the inside. be. Note that a sheath coated with polyethylene or the like is formed on the outside of the metal coating layer 4.

When connecting an optical cable having such a structure to a repeater or terminal equipment (transmitting/receiving equipment) as an optical communication path, or when inspecting optical transmission characteristics, it is a matter of course that the metal coating layer 4. Tensile strength line 3. It is also necessary to sequentially peel off the protective layer 2 from the outside to expose the optical fiber 1 and connect the optical fiber 1 to a repeater, terminal device, measuring device, or the like.

Conventionally, such lead-out work involves grinding the metal coating layer 4 in the shaded area shown in FIGS. 2(a) and 2(b) in the axial direction of the optical cable using an electric grindstone or the like, while the optical cable is fixed on a fixed stand.
The metal coating layer 4 was opened on both sides using pliers or the like, and the tensile strength wires 3 and the like were untwisted and unraveled to expose the optical fiber 1.

When exposing the optical fiber core wire 1 as described in Section J2, if the optical cable is bent, it is difficult to cut the optical cable, and the work must be done by multiple people.
Work efficiency was poor. In addition, the grinding wheel wears out rapidly, which increases costs, generates dust and noise, and increases the metal coating layer 4.
There have been problems such as the high temperature generated during cutting has an adverse effect on the optical fiber core 1 due to the heat.

[Purpose of the invention]

This invention was made in view of the actual situation,
To provide a cable sheathing dismantling method and a tool for the cable sheathing work that can be carried out efficiently and without adversely affecting the core wires.

〔Example〕

FIG. 3 is a perspective view showing a cable sheathing dismantling tool according to an embodiment of the present invention, in which 5 is a cylinder made of metal or the like, 6-
is a V-shaped slit (notch) that contracts and closes as it progresses from one end of the cylinder 5 in the axial direction; 7A and 7B are /\\endors provided at both ends of the cylinder 5 in the radial direction of the cylinder 5; It is preferable that one handle 7A be made detachable by screwing it into the cylinder 5.

When performing an optical cable opening work using the cable sheath dismantling tool of the present invention constructed as described above, first cut a part of the metal sheath layer 4 of the optical cable shown in FIG. 1, and the tip of the tensile strength wire 3 is inserted into the slit 6 and locked as shown in FIG. 4(a). After that, hold the handle 7A with both hands to apply tensile force around the cylinder 5! ! By rotating a3 along the twisting direction of the tensile strength wire 3 in a winding manner, the metal coating layer 4 can be cut while winding the tensile strength wire 3 around the cylinder 5 as shown in FIG. 4(b). At this time, each handle 7A,
・You can also rotate both 7B by holding them in your left and right hands.

Then, when the metal coating layer 4 has been cut to a desired length, the handle 7A is removed from the cylinder 5 and the wrapped tensile strength wire 3 is moved in the direction in which the slint 6 expands with respect to the cylinder 5, and the tensile strength is increased! ! ! 3 is unlocked at its tip and can be removed from the cylinder 5. Thereafter, the torn metal coating layer 4 can be peeled off using pliers or the like in the same manner as in the prior art, and the optical fiber core 1 can be exposed.

Dismantling the coating of the cable of this invention] - The tool cuts the slit 6 to 7
Since it is shaped like a letter, it can be used for tensile strength wires 3 of various wire diameters, and since the tensile strength wire 3 bites into the slit 6, it is possible to make it difficult for the tensile strength wire 3 to separate when the cylinder 5 is rotated. Further, the tensile strength wire 3 can be easily removed.

In addition, in the above embodiment, both ends of the cylinder 6/\endows 7A, 7
B is provided, but it is also possible to provide only one /\endle 7A or 7B. It goes without saying that the present invention can be applied not only to optical cables but also to general cables whose tensile strength wires are piano wires or the like.

〔Effect of the invention〕

In this invention, as described above, the cable lead-out work can be easily performed, so even one person can easily and efficiently perform the lead-out work, and there is no dust.

Since the work can be carried out in satellite-like conditions without the generation of noise or heat, work efficiency is improved and the cable cores are not adversely affected by heat. In addition, there are advantages such as no consumables and no expenses required for the intervening work.

[Brief explanation of the drawings] Figure 1 is a sectional view showing seven examples of optical cables, Figure 2 (a)
, (b) is an explanatory diagram of the conventional opening work, FIG. 3 is a diagonal diagram showing a cable sheathing dismantling tool which is an embodiment of the present invention, and FIGS. It is an explanatory diagram of the meddling work. In the figure, 1 is an optical fiber core wire, 2 is a protective layer, 3 is a tensile strength wire, 4 is a metal coating layer, 5 is a cylinder, 6 is a slit, 7A, 7
B is a handle. Figure 1 Figure 2 (a) (b)

Claims (2)

[Claims] (1) Pull out one of the multiple tensile strength wires twisted into the cable from the cut end of the cable, and
A cable coating dismantling method characterized by cutting the metal coating layer while rotating the main tensile strength wire to the other end of the cable. (2) A cable characterized in that a handle extending in the radial direction of the cylinder is provided at the end of the cylinder forming a seven-shaped sliat that contracts and closes as it advances in the axial direction from one end. Coating disassembly tool.