JP2967543B2 - Striatal construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of passing a wire such as an optical fiber through an optical fiber attachment pipe or a single pipe of a power cable.

[Prior art]

In recent years, a method using the adhesive force of air has been proposed as a method for passing an optical fiber through a pipe for communication, which has excellent characteristics as compared with a method using a drawn steel. For example, FIG. 5 shows one of the air utilization methods (Japanese Patent Application No. 2-22921). In this method, a communication line 2 and an air supply path 3 are provided in a large communication line head 1, and pinch rollers 4 and 4 are provided above and below the communication line 2; On the other hand, an air leak prevention part 6 is formed on the inlet side while the pinch rollers 4 and 4 are driven, and compressed air is supplied from the outside to the air supply path 3 to connect the optical fiber ( The wire body is sent out from the inlet side of the wire head 1 through the outlet side into the wire pipe 5.

[Problems to be solved by the invention]

However, in the case of the above method, the air leak prevention portion 6 on the inlet side of the wire head 1 is merely a configuration in which the gap is narrowed and narrowed, so that a sufficient leak prevention effect cannot be obtained. there were. Also, as described above, the pinch rollers 4,
In the structure incorporating the 4, the head itself must be large, and the installation of the pinch rollers 4, 4 complicates the head itself, measures against air leakage, free operation, control, etc. There was room for improvement. The present invention has been made in view of such a conventional situation.

[Means for Solving the Problems]

Such a feature of the present invention is that a line head having a communication line therein and an air supply path joined to the line, and a line head connected to an outlet of the line head. A pipe, a pinch roller installed outside the wire head on the inlet side of the wire head, and a pinch roller installed between the pinch roller and the inlet to blow or introduce auxiliary air into the inlet. With air leakage prevention means, with the driving of the pinch roller, to supply compressed air from the outside to the air supply path, and to eject or introduce auxiliary air from the air leakage prevention means to the introduction port side, According to a wire construction method of a wire which sends out a striated body from the introduction port side of the siding head through the sending / outlet side into the pipe for the siding.

[Action]

According to the construction method of the present invention, since an aggressive means for preventing air leakage is taken at the inlet side of the wiring head, an extremely good effect of preventing air leakage can be obtained. In addition, since the pinch roller has a structure in which the pinch roller is installed outside the head, in addition to the above-described good air leakage prevention effect, the head itself can be reduced in size and simplified, and measures for air leakage can be easily performed. Free operation and control of the pinch roller can be performed easily.

【Example】

FIG. 1 shows an embodiment of a wire passing method for a striated body according to the present invention. The communication device used in the present invention has a communication line 12 inside,
Line head 11 where air supply path 13 is merged with this line 12
And, a wire pipe 15 connected to the outlet side of the wire head 11, pinch rollers 14, 14 installed on the inlet side of the wire head 11, and provided on the inlet side, An air leak prevention unit 16 having a structure in which a normal gap is narrowed narrowly is installed near the inlet side (a position facing the narrowly narrowed gap of the air leak prevention unit 16), for example, as shown in FIG. And air leakage prevention means A comprising a pair of semicircular auxiliary air injection nozzles 20,20. In this apparatus system, in order to carry out the present invention, compressed air is supplied from the outside to the air supply path 13 together with the driving of the pinch rollers 14 and 14, and the auxiliary air injection nozzles 20 and 20 of the air leakage prevention means A are further provided. Then, the striated body, that is, the optical fiber may be sent out from the inlet side of the wire head 11 to the outlet pipe side into the wire pipe 15. At this time, since the leakage amount Q ₂ to which leaks from the air leakage prevention unit 16, the optical fiber, backward force and the traveling direction
F ₂ is acts, tip auxiliary air injected from the auxiliary air jet nozzles 20, 20 is blown strongly into the gap of the introduction port side of the wire-passing the head 11, acting auxiliary air becomes a kind of air barrier to the leakage amount Q ₂ is provided is kept as small as possible, the reverse force F ₂ is close almost to zero. Accordingly, the flow rate Q ₁ Komu flow in through line pipe 15 is approximately equal to the total supply amount Q ₀ of the air supplied to the air supply passage 13, the force F ₁ acting in the traveling direction of the optical fiber is increased Therefore, it is possible to realize an extremely long optical fiber transmission distance. At this time, the inner diameter of the inlet is d and the outer diameter of the optical fiber is d ₁
A gap S ₁ inlet side upon is because it is ^{_{(d-d 1) 2 /}} 4π, the cross-sectional area of the nozzle 20, 20, it is preferably required to be the gap S ₁ and equal to or more . In this method, since the pinch rollers 14, 14 are installed outside the wire head 11, the head 11 basically needs only to have the wire 12 and the air supply path 13, so that the size of the head itself can be reduced. Simplification is achieved. Further, by providing the pinch rollers 14, 14 in the vicinity of the inlet of the wire feed head 11, slack of the optical fiber between the pinch rollers 14, 14 and the inlet can be prevented. FIG. 3 shows another embodiment of the method of passing a wire through a wire according to the present invention. In this case, auxiliary air is introduced into the inlet of the wire head 11 as air leak prevention means A. connect the auxiliary air passage 21, such as a conical tubular shape, by supplying compressed air from the outside into the air passage 21, and suppresses the leakage amount Q ₂ of the air substantially zero. That is, since the auxiliary air blown from the front end portion 21a of the air passage 21 forms a strong barrier in the closed passage, the barrier effect is large, and a substantially complete leak prevention function can be obtained. Of course, in this case, the leakage amount from the wire-passing the head 11 side with respect to (flow rate), it is preferable to set a large auxiliary air quantity Q ₃ from the air passage 21 side. FIG. 4 shows still another embodiment of the method of passing a wire through a striated body according to the present invention. In this case, as air leakage preventing means A, auxiliary air is introduced into the inlet of the wire passing head 11. to communicated auxiliary air filling chamber 22, by supplying compressed air from the outside into the auxiliary air filled chamber 22, and it suppresses the leakage amount Q ₂ of the air substantially zero. That is, since the auxiliary air filling chamber 22 is filled with the auxiliary air to form a strong barrier in the closed chamber as well, the barrier effect is large, and an almost complete leak prevention function can be obtained. Of course, also in this case, the leakage amount from the wire-passing the head 11 side with respect to (flow rate), to set an auxiliary air quantity Q ₃ to the auxiliary air filled chamber 22 increases desired. Further, at this time, as shown in the figure, if the air outlet 23 to the auxiliary air filling chamber 22 is formed into a nozzle having a narrow gap and the compressed air is blown out, a more excellent leak prevention function can be obtained. The air leak prevention means A of the present invention is not limited to the above three examples.

【The invention's effect】

As is apparent from the above description, according to the method of passing a wire through the striated body according to the present invention, since an aggressive air leak preventing means is taken by the introduction port side of the wire head, extremely good air leak prevention is achieved. The effect is obtained. As a result, it is possible to realize a very long wire length of the striated body. In the case of an optical fiber as an example, when there is no means for preventing air leakage, the length of the wire is at most about 200 to 300 m. It was possible to improve the line length to about 500 to 1000 m. Further, in the present invention, since the pinch roller has a structure in which the pinch roller is installed outside the head, in addition to the above-described good air leakage prevention effect, the head itself can be reduced in size and simplified.
Air leak countermeasures can be easily performed, and free operation and control of the pinch roller can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a method of passing a wire through a striated body according to the present invention, and FIG. 2 shows an auxiliary air injection nozzle of an air leak preventing means used in the method of FIG. Perspective view,
FIG. 3 is a schematic explanatory view showing another embodiment of the method of passing a wire through the wire according to the present invention, and FIG. 4 shows another embodiment of the wire passing method through a wire according to the present invention. FIG. 5 is a schematic explanatory view showing a conventional line construction method. In the figure, 11 …… Communication head, 12 …… Communication line, 13 …… Air supply path, 14 …… Pinch roller, 15 …… Communication pipe, 16 …… Air leakage prevention part, 20 …… Auxiliary air Injection nozzle, 21 ... Auxiliary air passage, 22 ... Auxiliary air filling chamber, A ... Air leakage prevention means,

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tohru Wada 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Jiro Takei 1-5-1, Kiba, Koto-ku, Tokyo Fuji Electric Cable Incorporated (56) References Japanese Utility Model Sho 63-45508 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 6/52 H02G 1/08

Claims (4)

(57) [Claims] 1. A communication line head having a communication line therein and an air supply path joined to the communication line, a communication pipe connected to an outlet of the communication head, and the communication head. A pinch roller installed outside on the introduction port side of the wiring head, and an air leak prevention unit installed between the pinch roller and the introduction port, for ejecting or introducing auxiliary air to the introduction port. When the pinch roller is driven, compressed air is supplied from the outside to the air supply path, and auxiliary air is blown out or introduced from the air leak prevention means to the introduction port side, so that the filament is passed through the wire. A wire-forming method for a striated body, wherein the wire is fed into the wire pipe from the inlet side of the wire head through the outlet side. 2. The method according to claim 1, wherein said air leakage preventing means comprises an auxiliary air jet nozzle for jetting auxiliary air into an inlet of said wire head. 3. The wire construction method according to claim 1, wherein said air leakage preventing means comprises an auxiliary air passage connected to an introduction port of said wire head. 4. The method according to claim 1, wherein said air leakage preventing means comprises an auxiliary air filling chamber which communicates with an inlet of said wiring head.