JPH0455288Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a tube wrapping for loading optical fibers, and particularly to a wrapping body suitable for vibration loading of optical fibers.

(Prior Art) Optical communication cables that have become widely used in recent years are required to have a metal-coated structure because optical fibers are weak in strength. Conventionally, as a method of manufacturing an optical fiber wire in which an optical fiber is loaded inside a tube such as a metal tube,
Tape forming-welding method (e.g. JP-A-60-46869)
Or pipe insertion method (e.g. JP-A-58-25606)
It has been known.

The former method involves forming a metal tape into a tubular shape, welding both edges of the tape, and inserting an optical fiber into the tube. It has drawbacks such as being easily affected by welding heat and deteriorating in quality, and technically difficult to insert if the tube has a small diameter of 2 mm or less.

On the other hand, the latter method involves manufacturing an aluminum pipe with steel wire, then reducing the diameter of the pipe, and then replacing the steel wire inside the pipe with an optical fiber, which also complicates the manufacturing process. Another problem is that it is difficult to use long fibers because a replacement force greater than the strength of the fiber cannot be used due to the risk of wire breakage.

As a result of various research and experiments aimed at improving the above-mentioned drawbacks, the present applicant and others have found that they have been able to efficiently obtain metal-coated optical fibers without going through complicated processes, and that they are free from deterioration and defects in the optical fibers. We have completed an innovative loading method that can prevent this and allow optical fibers to be inserted into even small-diameter and long tubes, and have already filed an application (Japanese Patent Application No. 181126-1982).

(Problems to be Solved by the Invention) The invention of the above-mentioned patent application No. 181126/1983 basically involves gradually loading the optical fiber while applying vibration to the winding body of the tube into which the optical fiber is inserted, for example, the bobbin. However, there are various points that need to be improved in actual operation. In particular, the degree of closeness between the bobbin to be directly vibrated and the tubular body wound around the bobbin has a great influence on the loading operation of the optical fiber.

In other words, when loading an optical fiber into a tubular body, after inserting the optical fiber into the tube end, a spiral vibration that combines vertical and horizontal vibrations is applied to the bobbin, and this vibration is transmitted to the wound tube. In this way, the optical fiber is loaded into the tube.

Therefore, if the tube is not tightly attached to the bobbin, vibrations will not be transmitted accurately and smooth loading of the optical fiber will not be possible. In particular, when winding a tube around the body of a bobbin that constitutes a winding body, it is easy for the tube to come into close contact with the body in the radial direction of the bobbin, but it is difficult to make close contact with the body in the axial direction of the bobbin, which causes disturbances in vertical vibration. There are possible problems that are likely to occur.

The present invention was made in order to solve the problems in the vibration loading of optical fibers, particularly the problems that arise when winding a tubular body around a bobbin.

(Means for solving the problem) The present invention is configured as follows to achieve this objective. That is, the tube winding body is composed of a bobbin in which a tube for inserting an optical fiber is wound around the body, and the optical fiber is loaded into the tube by imparting vibration to the bobbin,
This tube winding body for loading optical fiber is constructed by surrounding and fixing the tube wound around the bobbin body with an adhesive tape.

(Function) When inserting the optical fiber into the tube, since the tube can be tightly fixed to the bobbin body with adhesive tape in this way, the vibration of the bobbin can be transmitted to the tube with high precision, and the vibration loading of the optical fiber can be improved. can be carried out smoothly and efficiently.

In the previous and subsequent explanations of this invention, optical fiber refers to a raw fiber consisting of a core and a cladding layer, a raw fiber coated with synthetic resin, metal, ceramic, etc., and a single core fiber. Alternatively, it includes multi-core or stranded wires. Further, the pipes are mainly metal pipes made of steel or aluminum, but of course non-metallic pipes such as plastic pipes may also be used. Further, the term "vibration" includes not only the spiral vibration described in the previous Japanese Patent Application No. 181126/1982 but also horizontal rotational vibration.

(Example) An example of the present invention will be described below based on the drawings.
Figure 1 is an overall view of the vibration loading device equipped with the present invention.
FIG. 2 is a plan view of the vibration table.

As shown in FIG. 1, the winding body R has its bobbin 1
After wrapping the tube P (in one layer or multiple layers) around the body of the tube, the tube is fixed by surrounding the tube P with an adhesive tape 12 shown in FIG. The adhesive tape 12 may be wrapped or wound in multiple turns so as to firmly fix the pipe P.

Any adhesive tape 12 may be used as long as it has the adhesive force necessary to firmly adhere the tube wound around the bobbin body to the bobbin and maintain this adhesive state for a certain period of time. but,
It is desirable that this adhesive tape can be easily peeled off manually when the tube is to be separated from the bobbin after the optical fiber has been loaded. As a material that satisfies such requirements, it can be said that, for example, gummed tape is most suitable for use.

In addition, the winding body R is fixed to the vibration motor 3a, by fixing the outer peripheral edge of the lower flange and the shaft hole of the bobbin 1 with the fixing jig 9 of the vibration table 2, etc.
Vibration table 2 to ensure that it receives the vibration of 3b.
It is placed and fixed on top. A pair of vibration motors 3a and 3b are integrally installed on the vibration table 2 at an angle of about 30 degrees from the vertical line, and the pair of vibration motors causes the winding body, that is, the pipe, to be centered around the winding body central axis. Gives vibration. The vibration table 2 is attached to the pedestal 5 via a spring 4, so that the vibrations of the vibration table are not transmitted to the pedestal 5.

In this specific example, a rotary vibrator that generates vibration by using the centrifugal force generated by the rotation of unbalanced weights installed at both ends of the rotating shaft is used as the vibration motor, and two rotary vibrators are installed on the vibration table 2. Attach it symmetrically with respect to the axis C of the body R. The angles that the vibration surfaces of the pair of vibration motors 3a and 3b make with the two horizontally installed vibration tables are equal, and the other vibration conditions of the vibration motors (frequency, amplitude, etc.) and the rotation direction of the vibrator are also The vibrating table 2 is configured to give a spiral vibration that is a combination of the vibrations generated by the pair of vibrators. Incidentally, instead of the vibration by the rotary vibrator, crank-type or electromagnetic-type vibration may be applied.

When such vibration is applied to the vibration table 2,
The article on the table performs a circular motion (in the illustrated example, a counterclockwise circular motion) about the intermediate shaft of the vibration motors 3a, 3b. This intermediate shaft and steel pipe wrapping R
By placing the winding body R on the vibration table so that the central winding axes of the vibration table 2 coincide with each other, the axis of the winding body R and the vibration central axis of the vibration table 2 can be made to coincide with each other.

A steel pipe P tightly wound around a bobbin 1 has a pipe inlet end 7 at the bottom of the bobbin 1 and a pipe terminal end 8 at the top, and a horizontal anti-vibration guide 11 is arranged approximately on the same axis as the pipe end 7. are placed close together. Furthermore, an optical fiber supply spool 10 for feeding the optical fiber is provided on the entrance side of the vibration-proofing guide (opposite side of the bobbin).

Next, the operation of the illustrated equipment will be explained. When the above-mentioned spiral vibration is applied to the steel pipe wrapping R, that is, the bobbin 1 via the vibration table 2, the vibration is directly transmitted to the pipe P, and the conveying force of this vibration is supplied from the tube end 7 below the wrapping. The optical fiber 6 thus formed continuously enters into the steel pipe P. That is, the optical fiber 6 is unwound from the spool 10, fed into the steel pipe P from the anti-vibration guide 11 through the tube end 7, is moved by the vibration of the wrapping body R, and is loaded into the entire wrapping body after a predetermined time. .

In the above-mentioned vibration loading, the tube is tightly held by the adhesive tape 12 on the bobbin body, and the vibration of the bobbin 1 is reliably transmitted to the tube, and the degree of freedom of the tube itself is minimized to prevent random vibration. In the present invention, since the movement of the tube in the axial and radial directions of the bobbin is effectively suppressed by the adhesive tape, smooth and efficient fiber loading is possible.

Note that if a groove for holding the tube is formed in the body of the bobbin 1, the tightness of the tube to the bobbin body can be further improved.

(Effect of the invention) As explained above, according to the wrapping body of the invention,
Since the vibration of the bobbin can be transmitted to the tubular body with high precision, when loading the optical fiber into the tube with vibration, it can be reliably fed into the tube, and the optical fiber can be loaded smoothly.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of vibration loading equipment incorporating the winding body of the present invention, and FIG. 2 is a plan view of a vibration table. R... Winding body, P... Steel pipe, C... Vibration center axis, 1... Bobbin, 2... Vibration table, 3a,
3b... Vibration motor, 6... Optical fiber, 7...
Pipe inlet end, 8...Pipe end, 10...Spool, 1
1... Anti-vibration guide, 12... Adhesive tape.

Claims (1)

[Scope of utility model registration request] A tube winding body comprising a bobbin in which a tube for inserting an optical fiber is wound around the body, and which loads the optical fiber into the tube by imparting vibration to the bobbin,
A tube winding body for loading an optical fiber, characterized in that the tube wound around the bobbin body is surrounded and fixed with an adhesive tape.