JPH0123121Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The invention relates to a device for winding up and processing the excess length in a line distribution device for optical fiber cables used in optical communication systems. be.

(b) Background of the technology Optical communication systems have the characteristic of being able to transmit and receive signals such as large-capacity calls and video signals compared to conventional systems.
Unlike copper wire cables, it is difficult to cut and connect optical fiber cables arbitrarily due to the number of man-hours, equipment, technology, etc. in the construction method.In order to connect equipment racks, it is necessary to determine the appropriate length in advance and use optical connectors, etc. It is necessary to connect the connections.

(c) Prior art and problems Figure 1 is a block diagram showing the connection of two terminal stations. An optical fiber cable 4 is installed between the station building 1 and the station building 2 through an underground manhole 3, but the optical fiber cable 4 rising from the underground is temporarily installed in the line distribution device (LDF: Line
distribution frame) 5 and is distributed to the equipment racks 6 of the station buildings 1 and 2. However, depending on the arrangement, the length of the optical fiber cable 7 in the station buildings 1 and 2 differs depending on the arrangement position of the respective equipment racks 6. Sometimes this distance reaches 100 meters inside the station building. In this case, cutting or welding (splicing) the optical fiber cable 7 according to the position of each equipment rack 6 is extremely complicated work, so generally the line distribution device 5 accommodates the excess length and The length of the long optical fiber cable 7 is used. Therefore, it is necessary to adjust the extra length by about 3 to 5 m.

FIG. 2 is a perspective view showing the relationship between the line distribution device and the equipment rack. The equipment rack 6 and the line distribution device 5 are connected by an optical fiber cable 7, and the extra length 8 of the optical fiber cable 7 is housed inside the line distribution device 5 in the form of a loop.

FIG. 3 is a perspective view showing a conventional structure for accommodating the extra length of optical fiber cable inside a line distribution device. An optical fiber cable 7 with a diameter of about 30 cm is wound around a large number of guide rods 52 on an iron frame 51 in the line distribution device 5, and the upper part 7a of the optical fiber cable 7 is guided to the equipment rack 6, and the lower part 7b is guided to the manhole 3. It's dark. The loop 7c of this loop-shaped optical fiber cable has a large number of loops stacked on top of each other, and is further arranged in a large number of groups as shown in the figure.

This method is simple, requires less storage space, and is economical; however, for example, when the number of subscribers increases, etc., it is necessary to change the arrangement of the equipment racks 5, or change the length of the optical fiber cable due to removal and movement. In order to do this, it is necessary to sequentially unravel the large number of loop-shaped optical fiber cables 7 and to replace the accommodation of each optical fiber cable 7, which is extremely complicated manual work.

FIG. 4 is a perspective view showing another structure for accommodating the extra length of the optical fiber cable. In order to accommodate the optical fiber cable 7 vertically, a plurality of cable holders 11 are arranged and fixed on the circumference. The cable holder 11 is provided with a resilient tongue piece 11a, and the loop 70 of the optical fiber cable 7 is manually pushed through the opening 11b of the tongue piece 11a. In this method, too, a large number of loops are stacked and pushed in, so taking out the intermediate loops is a complicated manual operation, similar to the structure shown in FIG. 3 described above. Furthermore, in the case of optical fiber cables, the transmission characteristics change due to undue tension applied thereto, so care must be taken when handling them.

(d) Purpose of the invention The present invention provides a surplus length processing device that can compactly store the surplus length of an optical fiber cable and improve workability for maintenance work that requires the surplus length. It is something to do.

(e) Structure of the invention The invention consists of a movable body that has a fulcrum pivoted on a rack and can be rotated around this branch to two positions, a storage position and a pull-out position, and an optical fiber cable. a reel around which the extra length of the reel is wound and whose center is rotatably supported on the movable body; and a mainspring having one end fixed to the movable body and the other end fixed to the reel. The above object is achieved by an optical cable surplus length processing device characterized by the following.

(f) Embodiment of the invention FIG. 5 is a perspective view of an automatic optical cable surplus length processing structure according to the invention. For the sake of explanation, only two structures are shown side by side for simplicity. It actually consists of many columns. A disc reel 21 is rotatably supported on the movable plate 20 by a shaft 22, and a mainspring 25 fixes one end to the shaft 22, and the disc reel 21 is rotatably supported by a shaft 22.
The other end is fixedly attached to a fixed shaft 24 which is fixed to 1. The disc reel 21 is formed with four cut-outs 21a, and the optical fiber cable 7 is wound into a loop in the grooves 21b of the cut-outs 21a, as shown in the figure, in two bundles.

The movable platen 20 is rotatably supported on the equipment rack 5 by a shaft 23 at a lower front corner. The movable board 20 can be turned by hand in the direction of arrow A.
The movable plate 20' is shown rotated 90 degrees.

In FIG. 5, the movable board 20 is in the storage position. In this state, when the wound optical cable is required for maintenance work or the like, the movable board 2 is rotated in the direction of arrow A using the shaft 23 as a fulcrum, and pulled out to become the state of the movable board 20'. In this state, the excess length of the optical cable that has been wound up is cut off and removed from the raised part 21a, and the excess length is pulled out. Therefore, during maintenance work, the extra length of the optical fiber can be pulled out from the storage position like a printed board. Improves work efficiency. When the movable plate 20 is rotated in the direction of arrow A, the reel 21 is also rotated accordingly, so that the optical cable wound in the direction of the optical cable 7 is let out, and conversely, the optical cable in the direction of the optical cable 21b is wound up. It turns out. When rotating in the direction of arrow B and storing in the original state, the operation is the opposite.

Furthermore, the movable plate 20 and the disc reel 21 are connected by the mainspring 22 through the optical cable 7.
This is to add a certain tension in the direction of the optical cable 21b. With this tension, even if the optical cable is accidentally pulled from the direction of the optical cable 21b, it can be easily returned to its original state by the action of the mainspring, and the optical cable being wound becomes loose and cut. It will not come off the raised portion 21a and fall apart. Furthermore, winding and unwinding operations of the optical cable occur on the reel due to the rotating operation of the movable platen 20.
Even at this time, the wound optical cable does not loosen due to the action of the mainspring. Here, it goes without saying that the length of the unwound portion of the optical cable is also allowed to have some leeway.

(g) Effect of the invention As explained above, according to the invention, it is easy to take out the excess length of the optical cable from the storage position, and at this time, by rotating the reel,
No extra tension is applied to the optical cable.

Furthermore, since a constant tension is applied by the mainspring, the wound optical cable will not loosen.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing the connection of two terminal stations, Figure 2 is a perspective view showing the relationship between the line distribution equipment and the equipment rack, and Figure 3 is the extra length of the optical fiber cable inside the line distribution equipment. FIG. 4 is a perspective view showing a conventional storage structure, FIG. 4 is a perspective view showing another optical fiber cable surplus length storage structure, and FIG. 5 is a perspective view of an automatic optical cable surplus length winding structure according to the present invention. In the figure, 1 and 2 are station buildings, 3 is a manhole, and 5
is a line distribution device, 6 is a device rack, 7 is an optical fiber cable, 20 is a moving board, 21 is a disc reel, 22
is a shaft, 23 is a shaft, 24 is a fixed shaft, and 25 is a mainspring.

Claims (1)

[Scope of Claim for Utility Model Registration] A movable body having a fulcrum pivoted on a rack and capable of rotating and displacing between two positions, a storage position and a pull-out position, about the fulcrum, and a surplus optical fiber cable. It is characterized by comprising a reel whose long part is wound and whose center is rotatably supported on the moving body, and a mainspring whose one end is fixed to the moving body and the other end is fixed to the reel. Optical cable surplus length processing device.