JPH0457002A - Optical fiber pumping device - 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 an optical fiber pumping device for inserting an optical fiber cable into a pre-laid plastic tube assembly cable tube using air force, and particularly to This relates to a fiber supply box.

[Prior Art] Conventionally, as an optical fiber pumping device for inserting an optical fiber gaple into a tube of a pre-laid plastic tube assembly type cable using air force, a feeding stand 20 is used as shown in FIG. The optical fiber cable 2 is pulled out from the bobbin 10 rotatably supported by the
The @ side is supplied to the pneumatic feeding head 8, and the optical fiber 2 is fed into the optical fiber pneumatic feeding tube 9 by the pneumatic feeding head 8.
is inserted.

[Problem B to be solved by the invention] However, the optical fiber pumping device in the prior art only pumps the optical fiber cable 2 from one end thereof, and pumps both ends of the optical fiber cable respectively. It's not something. This is a structural restriction in that the optical fiber cable can only be taken out from the lower opening of the bobbin 10. This licking made it relatively difficult to extend the insertion length. In addition, the bobbin 10 tends to bend the optical fiber cable 2 in a certain direction, increasing the frictional resistance between the inner surface of the optical fiber air-feeding tube 9 and the optical fiber gable 2, leading to a reduction in the insertion length.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel optical fiber pumping device that eliminates the drawbacks of the prior art described above and can significantly extend the insertion length.

[Means for Solving the Problems] The optical fiber pumping device of the present invention comprises a box in which optical fiber cables are stored in multiple layers in an ``8'' shape and whose opposing surfaces can be opened and closed; A pneumatic feeding head installed in the box is provided, and the optical fiber cable housed in the box is configured to be forcedly fed into the air feeding tube from one end side and the other end side by the pneumatic feeding head.

[Function] Since the optical fiber cable is stored in an 8'' shape inside a box that can be opened and closed on opposite sides, the stored optical fiber cable cannot be sent out from either end. It is possible.

Therefore, as shown in FIG. 2, both ends of the optical fiber cable can be pumped in opposite directions from the middle of the optical fiber pneumatic feeding tube to the left and right tubes. Compared to the conventional configuration in which the optical fiber cable is pumped only from one end, the insertion length of the present invention is at least 2.
Improve twice as much.

In addition, since the optical fiber cable is supplied from a 8-way shape and stored, the bending tendency of the optical fiber cable is no longer in the same direction as when using a bobbin, so the frictional resistance inside the tube is small. It is easy to insert. Therefore, the insertion length can be greatly improved (more than twice).

[Examples] Examples of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a rectangular optical fiber supply box containing an optical fiber cable 2 shaped like an "8", and the opposing upper and lower surfaces can be opened and closed by upper and lower lids. . Therefore, the stored optical fiber cable 2 can be fed out from either the upper surface or the lower surface of the sagrai box 1, that is, from any terminal side of the optical fiber cable 2. Note that the material for this optical fiber supply box is preferably light, hard, and waterproof from the viewpoint of construction.

Inside this optical fiber supply box 1 is “8”.

Bending radius R of the optical fiber gaple 2 stored in a square shape
is 75, when the outer diameter of the optical fiber cable 2 is D.
D or more is necessary to avoid an increase in optical loss.

FIG. 1 shows a state in which the top cover of the supply box 1 is opened and the optical fiber cable 2 is pulled out from the top side.

A U-shaped base 4 of a pressure feeding stand 3 is fitted onto about 1/2 of the upper edge of the supply box 1, and vertically supported by three legs 5 extending diagonally upward from the base. A plate 6 is supported. A splitting die 7 is attached to the lower part of the plate 6, and a pneumatic feeding head 8 is attached to the upper part of the plate 6. The optical fiber cable 2 from the supply box 1 passes through the splitting die 7 and the feeding head 8.
The optical fiber is inserted into a tube 9 for pneumatic feeding.

Next, the operation of the optical fiber pumping device configured as described above will be explained. Here, the total length of the optical fiber pneumatic feeding tube 9 that is not inserted is 100 On.

First, in the usage mode shown in FIG.
One side of the optical fiber cable 2 is inserted into the tube 9 on the negative side. In this case, optical fiber cable 2
is supplied from a state where it is not stored in the shape of an "8".

Therefore, the bending tendency of the optical fiber cable 2 is no longer in a fixed direction as in the case of supplying it from the bobbin 1, and the frictional resistance within the tube is reduced, making insertion easier.

After inserting the optical fiber cable 2 for a length of 5001 from one side, the base 41 leg 5. Plate 6, split dice 7
The pressure feeding stand 3 consisting of the pressure feeding head 8 and the pressure feeding head 8 is removed from the supply box 1, the top lid is placed on the supply box 1, the top and bottom of the supply box 1 are turned upside down, and the bottom lid is removed.

The plate 6, the split die 7. The pumping stand 3 of the pumping head 8 assembly is fitted and placed.

And the remaining 500 from the optical fiber cable 2 and other @ side.
1 into tube 9 on the opposite side.

In this way, one side of the optical fiber cable 2 is inserted 5001 into one half of the total number of tubes to be inserted, and the other end of the optical fiber cable 2 is inserted into the tube 9 on the opposite side of the remaining 1/2. By inserting the 500111 side, the optical fiber cable 2 with a total length of 1000 ta can be laid under pressure.

In the above embodiment, the supply box 1 is turned upside down, but as shown in FIG. Supply box 1 on the other end
It is also possible to supply the optical fiber cable 4 in both directions at a time and force feed it to the left and right tubes 9 by means of pressure feeding stands 3 which are taken out from the left and right sides of the box 1 and placed on the left and right sides of the box 1, respectively.

[Effects of the Invention] As described above, according to the present invention, the optical fibers housed in the supply box in a square shape are supplied from each of the opposing surfaces of the supply box, and both ends of the optical fibers are supplied from each of the opposing surfaces of the supply box. inserted into the tube. Furthermore, since the optical fiber is not bent in a fixed direction, the friction between the inner surface of the tube and the outer surface of the optical fiber due to the bending during insertion is reduced. Therefore, the optical fiber insertion length is more than doubled compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an optical fiber pumping device according to the present invention in one usage mode, FIG. 2 is a diagram showing an example of how to use the optical fiber pumping device according to the present invention, and FIG. 3 is a diagram showing a conventional optical fiber pumping device. FIG. 2 is a diagram showing the configuration of the device. In the figure, 1 is a supply box, 2 is an optical fiber cable, 3 is a pressure feeding stand, 4 is a base, 5 is a leg, 6 is a plate, 7 is a splitting die, 8 is a pressure feeding head, and 9 is an optical fiber pneumatic feeding tube. show. Patent Applicant Hitachi Cable Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 2 2: χFγ6 Zukundis 1 unit - 7D

Claims (1)

[Claims] 1. A box in which optical fiber cables are stored in multiple layers in a figure 8 shape, and opposing sides can be opened and closed;
The box is equipped with an air pressure feeding head installed in the box, and the optical fiber cable housed in the box is configured to be configured to force feed the optical fiber cable from one end side and the other end into the air pressure feeding tube by the air pressure feeding head. Optical fiber pumping equipment.