JP4088024B2 - Loose tube type optical cable manufacturing method and adhesive supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a loose tube type optical cable and an adhesive supply device used therefor.
[0002]
[Prior art]
A conventional apparatus for manufacturing a loose tube type optical cable is shown as the one excluding the adhesive supply device indicated as a whole by 4 in FIG. Now, a method for manufacturing a conventional loose tube type optical cable will be briefly described with reference to FIG.
[0003]
The rotating segment plates 6, 5, 42A, etc. arranged in order from the upstream (right side in the figure) to the downstream are controlled so as to alternately repeat the left and right rotations. The angle is set so as to increase toward the downstream, whereby a plurality of loose tubes 1 (in which the optical fibers are loosely accommodated in the tubes) are twisted around the tension member 2 to the SZ. Yes.
[0004]
An appropriate adhesive 3 is supplied between the loose tube 1 and the tension member 2 that are twisted together in the collecting die 7 to stabilize the cable, but the position of supplying the adhesive 3 is a problem. .
[0005]
[Problems to be solved by the invention]
Conventionally, on the upstream side of the rotating branch plate located on the most upstream side, the adhesive material is appropriately immersed, such as passing through each loose tube through a tank in which the adhesive material is accumulated (so-called dobbing), or brushing. Since the adhesive material was scattered by the surroundings when the loose tube was swung with the SZ twisting while passing through the rotating splitter plate, In addition, there are many disadvantages such as the passage holes of each rotating branch plate becoming very dirty.
[0006]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and the solution means described in claim 1 is that a plurality of loose tubes loosely containing optical fibers are placed around a tension member, and an adhesive is provided. In the manufacturing method of the loose tube type optical cable formed by interposing and twisting to the SZ, the adhesive material is supplied and applied to the outer peripheral surface of the tension member in the final branching tube immediately before the assembly die. It is a manufacturing method of a type | mold optical cable.
[0007]
According to a second aspect of the present invention, there is provided a solution means having a hollow cylindrical shape having a hollow portion which is also a passage for a tension member, a guide cone portion at a front end, a rotational drive portion at a rear end, and an axially middle portion. A sliding cylindrical surface that extends in the same direction by an appropriate length is formed, and a plurality of tube passages through which the loose tube passes radially inward are formed in a circumferentially equal manner so as to extend in the axial direction. The sliding cylindrical surface is provided with an outer circumferential groove that circulates around the cylindrical surface, and a final branch tube having a plurality of radial feed passages that allow the outer circumferential groove and the hollow portion to communicate with each other. A hollow cylindrical shape having an axial thickness equal to the width of the outer peripheral surface is formed, and an inner peripheral portion thereof is in close contact with the sliding cylindrical surface so as to be slidable and rotatable with respect to the inner peripheral portion. An inner peripheral groove is drilled, and at least one of the inner peripheral groove communicates with the outside of the outer peripheral wall. The discharge passage and a supply / discharge ring in which at least one adhesive material supply passage penetrating in the radial direction from the inner peripheral surface to the outside of the outer peripheral wall is formed at a position corresponding to the outer peripheral groove of the final branch tube. It is an adhesive supply device.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A feature of the present invention is that the adhesive 3 is supplied by an adhesive supply device indicated by reference numeral 4 in FIG. Accordingly, the adhesive material supply device 4 will be described in detail with reference to FIGS. 1 and 2.
[0009]
The adhesive supply device 4 is composed of two parts, a supply / discharge ring 41 and a final branch tube 42.
[0010]
The final branch tube 42 has a generally hollow cylindrical shape, the front end portion is formed as a conical guide cone portion 42B, and the rear end portion is provided with a rotation drive portion 42A. The middle part is a large-diameter part, and its outer peripheral surface is formed as a smooth sliding cylindrical surface 41A. The hollow portion 49 is a passage for the tension member 2.
[0011]
The sliding cylindrical surface 41A is provided with an outer circumferential groove 45 that circulates in the circumferential direction in the middle in the axial direction, and a plurality of radial feed paths 44A that communicate with the hollow portion 49 from the outer circumferential groove 45 are formed. Established.
[0012]
In addition, a plurality of, in the illustrated example, five tube passages 43 extending in the axial direction are perforated at positions close to the outer periphery of the large diameter portion. Of course, the tube passage 43 is provided so as to avoid the position of the radial feeding path 44A described above as clearly shown in FIG.
[0013]
Next, the supply / discharge ring 41 will be described. The supply / discharge ring 41 has a hollow cylindrical shape that fits on the outer side of the sliding cylindrical surface 41A of the final branching cylinder 42, and its inner peripheral surface is provided in close contact with the sliding cylindrical surface 41A so as to be rotatable. .
[0014]
At least two inner circumferential grooves 46 that circulate in the circumferential direction are formed on the inner circumferential surface, and in the illustrated example, two are formed so that the inner circumferential groove 46 communicates with the outside of the outer peripheral portion of the supply / discharge ring. At least one discharge passage 47, 48 extending in the radial direction is formed in the illustrated example.
[0015]
Further, an adhesive feed passage 44 extending in the radial direction and penetrating from the inner peripheral portion of the supply / discharge ring to the outer peripheral portion is formed at a position where the outer peripheral groove 45 of the final branching tube 42 coincides with the axial position. Is done. Therefore, it is desirable that the drilling position is provided with an angular deviation from the discharge passages 47 and 48 as appropriate.
[0016]
At the time of installation of the entire apparatus, the supply / discharge ring 41 is fixed, and at this time, the discharge passages 47 and 48 are arranged so as to come downward. Accordingly, a pipe (not shown) for pressure-feeding the adhesive 3 is connected to the adhesive feeding passage 44, and a pipe (not shown) for discharging is connected to the discharge passages 47 and 48. It is provided as appropriate.
[0017]
Next, the manufacturing method of the loose tube type optical cable of the present invention, that is, the operation of the manufacturing apparatus will be described. The operations of the rotating branch plates 6, 5, 42A and the collecting die 7 are the same as those of the prior art.
[0018]
The adhesive 3 that is pressure-fed and supplied from the adhesive feed passage 44 during the progress of the twisting reaches the sliding cylindrical surface 41A, flows into the outer peripheral groove 45, and passes through the radial feed path 44A to pass through the hollow portion 49. It is press-fitted into.
[0019]
Further, the excess part of the adhesive 3 is discharged from the discharge passages 47 and 48 via the sliding cylindrical surface 41A and the inner peripheral groove 46.
[0020]
The adhesive 3 that has flowed into the hollow portion 49 adheres to the tension member 2 passing therethrough from around. That is, since the hollow portion 49 is a kind of adhesive material reservoir, and the tension member 2 is once completely immersed therein, the adhesive material 3 adheres in a sufficient amount.
[0021]
On the other hand, each loose tube 1 slides on the outer peripheral surface of the guide cone portion 42B and is twisted so as to wrap the tension member 2 in the collecting die 7. For this reason, as shown in the BB cross section of FIG. 3, the adhesive material 2 is generally distributed between each loose tube 1 and the tension member 2.
[0022]
【The invention's effect】
According to the first aspect of the present invention, since the adhesive is supplied only to the tension member located inside at the final branch tube, the adhesive is not scattered by the swinging of the loose tube, and the surroundings become dirty during the process. There is an advantage that there is no inconvenience.
[0023]
Further, according to the invention of claim 2, the adhesive is uniformly and sufficiently supplied in the circumferential direction to the hollow portion 49 by the radial feeding path 44A of the final branching tube, and around the tension member traveling therethrough. Since it adheres uniformly and sufficiently, there is an effect that the adhesive material is sufficiently and evenly distributed to the surrounding loose tube during twisting.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an adhesive supply device used for carrying out the method of the present invention.
2 is a cross-sectional arrow view taken along line AA in FIG.
FIG. 3 is a perspective view showing the whole manufacturing apparatus of a loose tube type optical cable.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Loose tube 2 Tension | tensile_strength member 3 Adhesive material 4 Adhesive material supply apparatus 41 Supply / discharge ring 42 Final branch cylinder 41A Sliding cylindrical surface 42A Rotation drive part 42B Guide cone part 43 Tube path 44 Adhesive material supply path 44A Radial supply path 45 Outer groove 46 Inner groove 47, 48 Discharge passage 5, 6 Rotating branch plate 7 Collecting die

Claims (2)

In the method of manufacturing a loose tube type optical cable, in which a plurality of loose tubes (1) loosely containing optical fibers are twisted around SZ with an adhesive (3) interposed around a tension member (2). A method of manufacturing a loose tube type optical cable, characterized in that the material (3) is supplied and applied to the outer peripheral surface of the tension member (2) in the final branch tube (42) immediately before the assembly die (7). The hollow member (49), which is also the passage for the tension member (2), has a generally hollow cylindrical shape, a guide cone portion (42B) at the front end, a rotational drive portion (42A) at the rear end, and an axially middle portion. A sliding cylindrical surface (41A) extending in the same direction by an appropriate length is formed, and a plurality of tube passages (43) through which the loose tube (1) passes radially inwardly extend in the axial direction. The sliding cylindrical surface (41A) is provided with an outer circumferential groove (45) that circulates around the outer circumferential groove (45) and the hollow portion (49). A final branch tube (42) having a plurality of radial feed paths (44A) drilled therein and a hollow cylinder having an axial thickness equal to the width of the sliding outer peripheral surface (41A), The inner peripheral portion is in close contact with the sliding cylindrical surface (41A) so as to be able to slide and rotate with each other, At least one inner peripheral groove (46) is bored in the inner peripheral portion, and at least one discharge passage (47, 48) for communicating the inner peripheral groove (46) with the outside of the outer peripheral wall and the final portion. A supply / discharge ring in which at least one adhesive supply passage (44) that penetrates radially from the inner peripheral surface to the outside of the outer peripheral wall is formed at a position corresponding to the outer peripheral groove (45) of the wire tube (42). (41) An adhesive material supply device.

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