JPH1048490A - Pipes-assembled cable and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to facilitate the intermediate branching work necessary for taking out pipes, etc., at the intermediate part of a cable by applying marks indicating the inter-pipe spacing positions on coating surfaces along the straight line of the interpipe spacings of at least one outside layers in the longitudinal direction of the cable. SOLUTION: The inter-pipe spacings 5 are formed between outer layer pipes and coatings 4 and if there is an upper wrapping 3, the spacings 5 are usually formed between the upper wrapping 3 and the pipes 2. The marks 6 are applied on the outside surface of the coating 4 along right above the center of the inter-pipe spacings 5 in the longitudinal direction of the cable. If the pips 2 are disposed spirally, the marks 6 are disposed spirally on the coating 4. If the pipes 2 are formed staightforward, the marks 6 are disposed straightforward on the coating 4. If the pipes 2 are assembled to >=2 layers, the marks may be applied on the outside surface of the coating along straight above at least one spacing position of the pipes 2 of the outer layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it easy to grasp the gap between pipes in a pipe assembly cable for air flow, and to facilitate the stripping operation in a branching operation.

[0002]

2. Description of the Related Art A technique for transmitting a communication line such as an optical fiber unit into a pipe by an air current such as air has been widely used.
The pipe used in this technique is usually made of plastic, and an optical fiber unit or the like is sent to a place where one or a plurality of pipes are provided in advance. Also,
Such a pipe may be provided in combination inside a power cable or the like, and the optical fiber unit may be passed therethrough later. Further, there is a case where a plurality of pipes are assembled and formed into a cable, and the optical fiber unit is transmitted only to a necessary portion of the pipes. As such a pipe aggregate cable, the one illustrated in FIG. 6 is used. In the figure, 61 is a core body such as a tension member, 62 is a pipe made of polyethylene, 63 is an upper winding, and 64 is a coating made of plastic.

[0003]

In such a conventional pipe-assembled cable, there is no particular problem in performing operations such as branching at the cable terminal, but some pipes are branched in the middle of the cable. Attempting to do so has the following problems.

[0004] In the branching operation, it is necessary to peel off the coating over several tens of cm at the middle of the cable, and cut and take out a predetermined pipe at that location. In stripping the coating, first, as shown in FIG. 7, a notch 65 penetrating the coating 64 is made in the longitudinal direction of the cable with a knife or the like, and while the coating is cut open and lifted, the coating is circumferentially cut on both sides of the cut. , And remove the coating 66 in the middle. In this case, there is a risk of damaging the internal pipe when making a cut from the outside of the coating with a knife or the like. Normally, the pipe is provided with an upper winding 63 at the time of gathering, but since the upper winding is made of thin cotton tape or plastic tape, it is possible to damage the plastic pipe through the upper winding when making a cut in the coating. Occur. In order to avoid this, extreme care must be taken when stripping the coating. The present invention provides a pipe assembly cable that can be operated without such careful attention.

[0005]

According to the present invention, in a pipe assembly cable in which a plurality of pipes are assembled and coated on the outside, a pipe gap is formed on a surface of the coating along a position immediately above at least one outer pipe gap. A mark indicating the position is provided in the longitudinal direction of the cable.

When a plurality of pipes are assembled, the pipes are spirally wound around the core body and assembled to form an upper winding. When twisting only the pipe spirally without a body, when bundling the pipe straight without a core,
Etc. In any case, a fan-shaped pipe gap is formed between the pipes. In the present invention, a mark indicating the gap position is provided on the coating surface in the longitudinal direction of the cable, just above the gap position.

[0007]

FIG. 1 is a diagram for explaining an embodiment of the present invention. In the figure, 1 is a core member such as a tension member, a plastic rod or the like, 2 is a pipe made of plastic such as polyethylene, 3 is an upper winding of cotton tape, plastic tape or the like, and 4 is a coating made of plastic such as vinyl chloride. Reference numeral 5 denotes a gap formed between the outer pipe and the coating, and when there is an upper winding, this gap is usually formed between the upper winding and the pipe. A mark 6 is formed on the outer surface of the coating 4 along the center of the gap 5 in the longitudinal direction of the cable. The portion of the core 1 may be constituted by a pipe similar to the outer layer pipe. In addition, when the assembled state is stable without the upper winding 3, the winding may be omitted or may be coarsely wound. Of course, when the pipe is spiral, the mark 6 is provided spirally on the coating. When the pipe is linear, the mark is linear on the coating. Is provided. FIG.
In the example, two marks are provided, but in a normal case, even one mark is sufficiently effective.

When the pipes are assembled into two or more layers, the outer surface of the coating may be marked just above at least one gap position of the outer layer pipe. When the pipes are arranged in a line in a plane, a mark may be formed on the surface of the coating along the gap immediately above any of the gaps formed between the pipes and the coating.

[0009] The mark is provided on the surface of the coating just above the gap formed between one or more outer pipes and the coating. The method of applying the mark includes a method of forming a depression in the coating and a method of forming a projection on the coating. There are a method of providing, a method of printing a character string on the coating, and a method of embedding a color band made of a material such as plastic in the coating. Hereinafter, in FIGS.

FIG. 2 shows a configuration in which a recess 7 is provided in the coating surface immediately above two pipe gaps 5 in the coating longitudinal direction. Such a recess 7 serves to guide the knife when making a cut with a knife or the like, and also makes it easier to cut the coating.

FIG. 3 shows a ridge 8 composed of a pair of small projections adjacent to the coating surface just above two pipe gaps 5.
Are provided continuously in the coating longitudinal direction. Such a cable is used in a case where the reduction in the strength of the coating due to the depression in FIG. 2 becomes a problem. Small protrusion is pipe gap 1
If there is one per place, the function of indicating the pipe gap position is sufficient, but if two are provided close to each other as shown in the figure, the recess between the projections serves as a guide when making a cut. And cutting can be easily performed.

FIG. 4 shows a case in which a color band of a color different from that of the coating is provided on the coating surface just above the two pipe gaps 5.
9 and 10 are color bands. To indicate the pipe gap position 9,
The same color may be used if it is provided in one of ten locations or two or more locations, but it also has the function of specifying the number according to the internal pipe arrangement by changing the color of the color band. Can be done. Changing two or more marks in this way is not limited to color bands.
Various combinations such as a combination of a dent and a projection and a combination of a single projection and a double projection are possible. In the method of providing the color bands 9 and 10 on the coating as shown in FIG. 4, the mark has another function such as not only indicating the position of the pipe gap 5 but also indicating the type of the cable in the color. This is also possible.

FIG. 5 shows a pipe assembly in which pipes 2 are arranged in a straight line around a core body 1 and an upper winding 3 is applied thereto, a support line 11 arranged just above one pipe gap, and these are integrated. The support line is formed of a ball-shaped covering 12, and the support line functions not only as a normal support line but also as a mark indicating a pipe gap position. In addition, in the case of FIG. 5, when making a cut in the coating, the support wire and the pipe assembly are cut off at the neck.

The marks are usually provided continuously in the longitudinal direction of the cable. However, even if the marks are provided discretely at a small interval as shown by a dotted line and a broken line, the marks are not provided from the peripheral marks to the pipes. It is sufficient to be able to estimate that there is a gap.

Next, a method of manufacturing a pipe aggregate cable will be described. When multiple pipes are assembled and rolled up, the upper roll is usually a thin tape, so it has a substantially polygonal cross-sectional shape, and the center of the polygonal side is the center of the outer layer pipe and coating. It is easy to see that the gap is between them. Therefore, when providing a coating of plastic or the like on the outside of such a pipe assembly, the surface of the pipe assembly is detected immediately before the extrusion head, and the rotary type that rotates around the axis based on the data is detected. By controlling the position of the die or marking device, it is possible to mark the exact location on the coating surface along the location just above the gap between the pipe and the coating. In the case of FIG. 5, since it is difficult to control the position of the support line, the pipe assembly is pushed out by a roller or the like in front of the extruding head to determine the position of the gap formed between the pipe and the coating. By adjusting, manufacturing can be performed without any problem.

[0016]

In the pipe assembly cable of the present invention, a mark is formed on the surface of the coating along at least one or more of the pipe gaps. Regardless of whether the inner pipe is spiral or straight, the cutting blade enters the gap between the pipes, so that the coating can be cut without damaging the inner pipe. Therefore, the use of the pipe assembly cable of the present invention has an effect that the intermediate branching operation which requires the pipe to be taken out at the cable intermediate portion becomes easy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a diagram showing an example in which a mark is made concave in the present invention.

FIG. 3 is a diagram showing an example in which a mark is formed as a protrusion in the present invention.

FIG. 4 is a diagram showing an example in which a mark is a color band in the present invention.

FIG. 5 is a diagram showing an example in which a support line also serves as a mark in the present invention.

FIG. 6 is a diagram showing a sheath cutting procedure in the middle of a cable.

FIG. 7 is an example of a conventional pipe assembly cable.

[Explanation of symbols]

 1: core body 2: pipe 3: upper winding 4: coating 5: pipe gap 6: mark 7: dent 8: ridge 9, 10: color band 11: support line 12: daruma type coating

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kinji Taguchi 1 Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Shigeru Tanaka 1-Tagamachi, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Sumitomo Electric (72) Inventor Kazuo Hokari 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Shigeru Tomita 3- 19-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Japan Telegraph and Telephone Corporation

Claims (8)

[Claims] 1. A pipe assembly cable in which a plurality of pipes are gathered and coated on an outer side, and a coating surface is formed directly above at least one gap position formed between the plurality of pipes and the coating. A mark indicating the pipe gap position is provided in the longitudinal direction of the cable. 2. The pipe aggregate cable according to claim 1, wherein said mark is a recess provided in a cable coating. 3. The pipe aggregate cable according to claim 1, wherein said mark is a projection provided on a cable coating. 4. The cable according to claim 1, wherein the mark is a character string printed on a cable sheath. 5. The pipe assembly cable according to claim 1, wherein the mark is a color band provided integrally with the cable coating. 6. The pipe assembly cable according to claim 1, wherein different types of marks are provided on the coating surface immediately above the adjacent pipe gap position. 7. A pipe assembly formed by linearly assembling a plurality of pipes so as to have a substantially circular cross section,
A pipe aggregate cable comprising: a support line disposed immediately above one gap position of an outer layer pipe of the pipe aggregate; and a dumbbell-shaped covering integrally covering the pipe aggregate and the support line. 8. A method of manufacturing a pipe assembly cable in which a plurality of pipes are gathered and plastic is extruded outward to cover the pipe, and the pipe is formed directly above at least one gap position formed between the plurality of pipes and the coating. In applying a mark indicating the pipe gap position on the coating surface in the longitudinal direction of the cable, the surface of the pipe assembly is detected in irregularities before the extrusion head in the extrusion coating process, and rotated around the axis according to the detection data. A method for manufacturing a pipe aggregated cable, comprising: controlling an extrusion die or a marking device to apply a mark in a longitudinal direction of the cable.