JPH0945160A - Communication cable for aerial installation, manufacturing method and manufacturing apparatus thereof - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a method for manufacturing a communication cable for aerial installation with good productivity. A support wire 1 and an optical cable core 2 pass from a support wire supply device 3 and an optical cable core supply device 4, respectively, through a first reciprocating twisting device 5, where the cable core 2 is connected to the support wire 1. Is reciprocally twisted around, is supplied to the extruder 7 from the point 6, is commonly covered, passes through the first and second shape shaping dies 8 and 9, and is commonly covered with a sheath having a neck portion intermittently. The optical cable for aerial installation is taken out, passed through the second reciprocating twisting device 10, taken up by the cable take-up device 11, and taken up by the take-up drum 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial installation communication cable.

[0002]

2. Description of the Related Art When a communication cable is laid imaginarily, a self-supporting dharma type cable in which a supporting wire and a cable are integrally united is used. The advantage of this dharma type cable is that the installation of the support line and the cable is completed in one time. However, in the Dharma type cable, the extension of the overhead wire propagates to the optical fiber or the copper wire which is the communication line, and the optical fiber or the copper wire is extended in the cable.

A communication cable installed imaginarily is a communication cable.
When new demand occurs in the middle of the bull, it is necessary to peel off the middle part, take out the communication line, and branch. When the communication line is extended as described above, a large force is required to take out the communication line from the communication cable at the time of intermediate branching, which may damage the communication line. In particular, an optical fiber made of a glass material is likely to be damaged when taken out and may be broken.

Therefore, as an optical cable for aerial installation,
A structure called a pre-hanger in which an optical cable core accommodating an optical fiber core wire is intermittently fixed to a support wire and has a slack is, for example, Japanese Utility Model Laid-Open No. 59-95304.
It is known from the official gazette.

However, in order to intermittently fix the optical cable core to the support wire and to connect the optical cable core to the support wire at predetermined intervals by using a connecting member, separate steps are performed for the support wire and the optical cable core. It is necessary to perform a step of joining these with a connecting member after forming the sheath with, and there is a problem in productivity because the number of steps increases.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is a method for manufacturing a communication cable for overhead laying with good productivity, and a communication cable for overhead laying manufactured by this manufacturing method. It is an object of the present invention to provide a manufacturing apparatus for this manufacturing method.

[0007]

According to a first aspect of the present invention, in a method of manufacturing a communication cable for aerial installation, a support wire and a communication cable core that is reciprocally twisted about the support wire are used as a common sheath. A first shape shaping die having a first neck forming hole and fixed and provided on the outlet side of the common sheath covering portion, and a second neck forming hole. Then, the communication cable core is pulled out through a second shape shaping die that reciprocates about the support line in synchronization with the reciprocal twist of the communication cable core, and the first and second neck forming holes are intermittently aligned to support the support. The wire and the sheath of the communication cable core and the intermittent neck portion are formed in the same step.

According to a second aspect of the present invention, in the method for manufacturing an aerial laying communication cable according to the first aspect, the outer periphery of the communication cable core is corrugated.
It is characterized in that an AP tape is vertically attached.

According to a third aspect of the present invention, an aerial laying communication cable is manufactured by the method for manufacturing an aerial laying communication cable according to the first or second aspect, and the communication cable core is provided with respect to the supporting wire. Has slack.

According to a fourth aspect of the present invention, in a manufacturing apparatus for an aerial laying communication cable, a reciprocating twisting apparatus for twisting a communication cable core back and forth around a support wire,
A common sheath covering portion to which the communication cable core twisted reciprocally with the support wire is supplied; and first and second shape shaping dies provided on the outlet side of the common sheath covering portion, The shape shaping die has a first neck portion forming hole and is fixed, and the second shape shaping die has a second neck portion forming hole and the support wire is synchronized with the reciprocating twisting device. Reciprocating as a center, and by intermittently matching the first and second neck forming holes, the supporting wire and the sheath of the communication cable core and the intermittent neck are formed in the same step. Is.

[0011]

FIG. 1 is a plan view showing an upper surface of an optical cable manufacturing apparatus for aerial installation for explaining an embodiment of the present invention. FIG. 2 is a front view showing a part of a side surface of the optical cable manufacturing apparatus for aerial installation for explaining the embodiment of the present invention. 3A and 3B are explanatory views of points and the first and second shape shaping dies. FIG. 3A is a point, FIG. 3B is a first shape shaping die, and FIG.
(C) is each sectional drawing of a 2nd shape shaping die. In the figure, 1 is a support line, 2 is an optical cable core, 3 is a support line supply device, 4 is an optical cable core supply device, 5 is a first reciprocating twisting device, 6 is a point, 7 is an extruder, and 8 is First shape shaping die, 9 is second shape shaping die, 10 is second
2 is a reciprocating twisting device, 11 is a cable take-up device, and 12 is a take-up drum.

In FIG. 1, a support wire 1 and an optical cable core 2 pass from a support wire supply device 3 and an optical cable core supply device 4 through a first reciprocating twisting device 5, respectively.
The point 6 is supplied to the extruder 7 provided on the inlet side. In the extruder 7, the support wire 1 and the optical cable core 2 are supplied with a coating material and are commonly coated, and the first shape shaping die 8 and the second shape shaping die 8 provided on the outlet side are provided.
The set of shape-shaping dies 9 is passed in this order, and is taken out as an aerial laying optical cable commonly covered with a sheath partially having a neck portion. The optical cable for overhead installation passes through the second reciprocating twisting device 10, is taken up by the cable take-up device 11, and is taken up by the take-up drum 12.

The first reciprocating twisting device 5 is provided on both the left and right sides of the support wire 1 and the optical cable core 2 and reciprocates about the support wire 1 and rotates the optical cable core 2 around the support wire 1. Optical cable core 2 while twisting back and forth
From the optical cable core supply device 4 to the pusher 7 side. For example, one pair of a plurality of rollers arranged in the cable longitudinal direction is provided to sandwich the optical cable core 2 and reciprocate around the support wire 1. Instead of a pair of rollers, one roller is arranged. It may be a pair of belt conveyors.

A point 6 is provided at the entrance of the extruder 7. As shown in FIG. 3 (A), this point 6 has a dharma-shaped hole as a whole,
A circular center hole 6a through which the support line 1 passes, a circular optical cable core hole 6b which has a center vertically below the center of this center hole 6a and through which the optical cable core 2 passes, and a thin line which connects the centers of the two and which connects them. A communication hole 6c having a width is opened. The point 6 reciprocates around the support wire 1 in synchronization with the first reciprocating twisting device. The hole shape of the point 6 is not limited to the illustrated shape, and for example, the communication hole 6c may be omitted. Any material that allows the support wire 1 and the optical cable core 2 to pass therethrough may be used.

In the extruder 7, the coating material is supplied from the side and the support wire 1 and the optical cable core 2 are coated with the sheath in common. On the exit side of the extruder 7, the first
The shape shaping dice 8 and the second shape shaping dice are provided.

As shown in FIG. 3 (B), the first shape shaping die 8 has an anchor-shaped hole as a whole,
A circular center hole 8a through which the supporting wire 1 with a sheath is inserted, a fan-shaped optical cable core hole 8b through which a sheathed optical cable core 2 having a center common to this center hole 8a and a center of the center hole 8a are inserted. A narrow communication hole 8c is formed on the vertical line for connecting the center hole 8a and the optical cable core hole 8b to form the neck portion of the sheath. The first shape shaping die 8 is spatially fixed and does not reciprocate.

As shown in FIG. 3 (C), the second shape shaping die 9 has a cross-sectional shape that is substantially the same as the point 6 in FIG. 3 (A). A circular central hole 9a, through which a dharma-shaped hole is formed as a whole and through which a sheathed support wire 1 passes, and an optical cable core 2 having a sheath centered vertically below the center of the central hole 9a. A circular optical cable core hole 9b is formed to pass through, and a narrow communication hole 9c is formed on a line connecting the centers of the optical cable core to connect the two and form a neck portion of the sheath. This point 9 is also the first reciprocating twisting device 5
And reciprocates around the support line 1.

The second reciprocating twisting device 10 is substantially the same as the first reciprocating twisting device 5, and is provided, for example, on both right and left sides of the support wire 1 and the cable core 2 having a common sheath. It is provided and reciprocates around the support wire 1, and while the optical fiber core 2 with the sheath is twisted back and forth around the support wire 1 with the sheath, the cable is taken out from the extruder 7. It is to be passed to the device 11 side. For example, a pair of rollers having a plurality of rollers arranged in the longitudinal direction of the cable is provided to sandwich the optical cable core 2 with a sheath and reciprocate around the support wire 1. Alternatively, a pair of belt conveyors may be used.

The cable take-up device 11 takes in the optical cable for aerial installation which is commonly covered with a sheath having a neck portion intermittently, and is, for example, a pair of drive rollers or a pair of drive belt conveyors.

Next, the operation of the embodiment of the present invention will be described. The first and second reciprocating twisting devices 5 and 10 are located in front of and behind the extruder 7, respectively, and reciprocally move around the support wire 1 to move the optical cable core 2 around the support wire 1. Twist back and forth. As a result, the optical cable core 2 is made to be in the SZ twisted state around the supporting wire 1 until the sheath in the softened state in which the sheath is commonly covered is cooled and solidified.

The first and second reciprocating twisting devices 5,
Reference numeral 10 is for reciprocally twisting the optical cable core 2 in the same phase, but both are reciprocally twisted in the opposite phase, or only one reciprocating twisting device is installed to reciprocally twist the optical cable core 2. You can also let it.

The first and second reciprocating twisting devices 5, 1
In synchronization with the twisting of the optical cable core 2 by 0, the point 6 and the second shape shaping die 9 reciprocate around the support line 1. The first shape shaping die 8 is spatially fixed.

The center holes 8a and 9a of the first and second shape shaping dies 8 and 9 are always aligned with each other, and the fan-shaped optical cable core hole 8b is always irrespective of the reciprocating movement of the second shape shaping die 9. Since the support wire 1 and the optical fiber core 2 are formed in a fan shape so as to overlap the core hole 9b,
A sheath is always formed so as to cover each circumference.

However, when the optical cable core 2 is out of the position vertically below the support line 1 due to the reciprocal twisting of the first and second reciprocating twisting devices 5 and 10, the first shape shaping die is used. Communication hole 9c of the second shape shaping die 9 by 8
Is closed, the neck portion of the sheath is not formed, and eventually only the respective sheaths of the support line 1 and the optical fiber core 2 are formed. When the optical cable core 2 is located vertically below the support line 1, the positions of the communication holes 8c and 9c of the first and second shape shaping dies 8 and 9 should be aligned with each other, and the neck forming hole should be opened. become.

Therefore, the sheath of the sheath, the support wire 1, and the optical fiber core 2 are formed, and the optical cable for aerial laying is taken out in common with the sheath having the neck partially or intermittently. In this way, the respective sheaths of the optical cable core 2 and the supporting wire 1 are
And the intermittent fixing of the optical cable core 2 to the support line 1 are realized at the same time.

The point 6 and the second shape shaping die 9 may be passively reciprocated according to the twisted state of the optical cable core 2, or the first and second shapes.
The reciprocal twisting devices 5 and 10 may be actively reciprocated in conjunction with the reciprocal twisting. In addition, the first shape shaping die 8 and the second shape shaping die 9 may be arranged in the reverse order so that the support wire 1 and the optical fiber core 2 pass through the second shape shaping die 9 first. Good.

FIG. 4 is an explanatory view for explaining the twisting action by the first and second reciprocating twisting devices, and FIG. 4 (A) is when seen from the direction orthogonal to the longitudinal direction of the cable. , Fig. 4
(B) is a positional relationship diagram when the cable is viewed from above. The optical cable core 2 is SZ-twisted around the support wire 1 by the first and second cable reciprocating twisting devices 5 and 10. Center O ₁ Karahikarike supporting line 1 - the distance to the center O ₂ of Burukoa 2 a, inversion positions A, B and the next turning point B, and reversing pitch of SZ twisting up A P, of SZ twist reversal When the angle is ψ radian, the twist ratio λ shown in the following approximate expression is obtained. λ = (πaψ / 2 / P) ² × 100 (%)

When the optical cable core 2 twisted by the amount of the above equation is fixed to the support wire 1 intermittently, the optical cable core 2 has a meandering slack with respect to the support wire 1.
As a result, when the overhead laying optical cable is suspended by applying tension to the support wire 1, the support wire 1 extends, but by releasing the meandering of the optical cable core 2, this formula is applied to the optical cable core 2. The elongation of the optical cable core 2 is relaxed until the elongation corresponding to the amount of is added. Therefore, the extension strain does not occur in the optical cable core 2 and the optical fiber core wire 24 housed in the slot 2b of the optical cable core 2.

The neck of the sheath is formed at the midpoint between the reverse position and the next reverse position. When the reversal pitch P is constant, the SZ twist is periodic, but it does not necessarily have to be constant.

FIG. 5 is a perspective view illustrating an embodiment of an optical cable for overhead installation according to the present invention. FIG. 6 shows A- of FIG.
It is a schematic structure figure explaining an example of a section in an A'part. In the figure, the same parts as those in FIG. 2a is a central strength member, 2b is a slot, 21
Is a support wire portion, 22 is an optical cable core portion, 23 is a sheath,
Reference numeral 23a is a neck portion, and 24 is an optical fiber core wire.

FIG. 5 shows an optical cable for aerial installation with meandering slack by the manufacturing apparatus and the manufacturing method described with reference to FIGS. 1 to 4. Sheath 23 on support line 1
The support wire portion 21 provided with the above and the optical cable core portion 22 in which the sheath 23 is provided on the optical cable core 2 are intermittently coupled by the neck portion 23a. Light cable to the support line 21.
The bull core portion 22 has a meandering slack, and the support wire portion 21
The distance from the optical cable core portion 22 to the optical cable core portion 22 is long in the portion where the neck portion 23a is present and short in the AA 'portion connected by the neck portion 23a.

The internal structure of an example of such an optical cable for overhead installation will be described with reference to FIG. The supporting wire 1 is composed of a plurality of tensile strength members such as steel wires, for example. The optical cable core 2 has, as an example, a central tensile member 2 inside thereof.
It is an optical cable core with a slot having a and having a plurality of slots 2b on its outer peripheral surface, and one or a plurality of optical fiber core wires 24 are housed in this slot 2b. As the optical fiber core wire 24, a single core wire, a tape shape,
Arbitrary ones, such as a tube-shaped multiple core, can be used.

In the optical cable for aerial installation, a LAP tape, for example, an aluminum layer and a resin layer such as polyethylene is laminated right above the outer periphery of the optical cable core 2 in order to provide waterproofness. Tape may be attached vertically, or seams may be welded. When the optical cable core is twisted as in the present invention, the LAP tape has a high rigidity, and therefore, the twisting is affected. Therefore, if the LAP tape is corrugated in advance in the longitudinal direction of the cable, the cross-sectional secondary moment of the LAP tape becomes smaller, and the optical cable covered with the LAP tape becomes smaller. -The flexibility of the optical core 2 is improved, and the optical cable core 2 covered with the LAP tape can be easily twisted. Further, when the optical cable for overhead installation is suspended, the optical cable core 2 covered with the LAP tape can be smoothly deformed from the meandering state.

In the above description, the optical fiber core wire 24 is used as an example of the communication line, and the optical fiber core wire 24 is housed in the slot type optical cable core 2.
The storage structure of the optical fiber core wire 24 is not limited to a specific structure. Alternatively, a copper wire may be used as a communication line, and a communication cable core accommodating a plurality of balanced pair cables or coaxial cables may be arranged instead of the optical cable core 2. Furthermore, in order to impart waterproofness, a LAP tape is vertically attached directly above the outer circumference of the communication cable core in which a plurality of balanced pair cables or coaxial cables are stored.
It is only necessary to apply a corrugated process to the corrugation in the longitudinal direction of the cable.

[0035]

As is apparent from the above description, according to the first aspect of the invention, the support wire and the communication cable core which is reciprocally twisted about the support wire are supplied to the common sheath covering portion. A fixed shape forming die having a first neck forming hole and a second neck forming hole provided on the outlet side of the common sheath covering portion, and the communication cable core having the second neck forming hole. Through a second shape shaping die that reciprocates around a support wire in synchronization with the reciprocal twisting of the support wire, and intermittently aligns the first and second neck forming holes, thereby supporting the support wire and the sheath of the communication cable core. Since the intermittent neck portion is formed in the same process, there is an effect that a self-supporting overhead laying communication cable that is less likely to damage the communication line at the time of intermediate branch can be efficiently produced in one process.

According to the second aspect of the present invention, since the corrugated LAP tape is vertically attached to the outer periphery of the communication cable core, the communication cable is provided with the waterproof property and the LAP tape is vertically attached. This has the effect of improving flexibility of the core and facilitating twisting. Further, when suspending the communication cable for aerial installation, the communication cable core covered with the LAP tape can be smoothly deformed from the meandering state.

According to the invention described in claim 3, according to claim 1
Alternatively, since the communication cable core is manufactured by the method for manufacturing an aerial laying communication cable according to 2, and the communication cable core has slack with respect to the support wire, there is little possibility of damaging the communication wire even at the time of intermediate branching even if it is a self-supporting type There is an effect that productivity is also good.

According to the invention described in claim 4, a reciprocating twisting device for twisting the communication cable core back and forth around the support wire, and a common sheath to which the communication wire core twisted back and forth with the support wire is supplied. A covering portion and first and second shape shaping dies provided on the outlet side of the common sheath covering portion,
The first shape shaping die has a first neck forming hole and is fixed, and the second shape shaping die has a second neck forming hole and has a support wire in synchronization with the reciprocating twisting device. Reciprocating as a center, and by intermittently aligning the first and second neck forming holes, the sheath of the support wire and the communication cable core and the intermittent neck are formed in the same process, so communication is performed at the time of intermediate branching. There is an effect that it is possible to efficiently produce a self-supporting aerial laying communication cable with less risk of damaging the wire in one process.

[Brief description of drawings]

FIG. 1 is a plan view showing an upper surface of an optical cable manufacturing apparatus for aerial installation for explaining an embodiment of the present invention.

FIG. 2 is a front view showing a part of the side surface of the optical cable manufacturing apparatus for aerial installation for explaining the embodiment of the present invention.

3A and 3B are explanatory views of points and first and second shape shaping dies, and FIG.
FIG. 3B is a sectional view of a first shape shaping die, and FIG. 3C is a cross-sectional view of a second shape shaping die.

FIG. 4 is an explanatory view for explaining a twisting action by the first and second reciprocating twisting devices, and FIG. 4 (A) is a view when seen from a direction orthogonal to a longitudinal direction of the cable. (B) is a positional relationship diagram when the cable is viewed from above.

FIG. 5 is a perspective view illustrating an embodiment of an optical cable for overhead installation of the present invention.

FIG. 6 is a schematic configuration diagram illustrating an example of a cross section taken along the line AA ′ in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Support wire, 2 ... Optical cable core, 5 ... 1st reciprocating twisting device, 6 ... Point, 7 ... Extruder, 8 ... 1st shape shaping die, 9 ... 2nd shape shaping die, 10 ... 2 reciprocating twisting device, 11 ... Cable take-up device, 24 ... Optical fiber core wire.

Claims (4)

[Claims] 1. A support wire and a communication cable core, which is reciprocally twisted about the support wire, are supplied to a common sheath covering portion, and the communication cable core is provided on an outlet side of the common sheath covering portion.
And a fixed first shape shaping die having a neck forming hole, and a second neck forming hole having a second neck forming hole and reciprocating about the support wire in synchronization with reciprocal twisting of the communication cable core. Through the second shape shaping die to
And the intermittent neck of the second neck forming hole forms the intermittent neck with the support wire and the sheath of the communication cable core in the same process. . 2. The method of manufacturing a communication cable for overhead installation according to claim 1, wherein a corrugated LAP tape is vertically attached to the outer periphery of the communication cable core. 3. A communication cable for overhead laying, which is manufactured by the method for manufacturing a communication cable for overhead laying according to claim 1 or 2, wherein the communication cable core has slack with respect to the support line. 4. A reciprocating twisting device for reciprocally twisting a communication cable core around a support wire, a common sheath covering portion to which the communication cable core twisted reciprocally with the support wire is supplied, and the common sheath. The first provided on the outlet side of the covering part
And a second shape shaping die, the first shape shaping die has a first neck forming hole and is fixed, and the second shape shaping die has a second neck forming hole. It reciprocates around the support wire in synchronization with the reciprocating twisting device, and intermittently matches the support wire and the sheath of the communication cable core by intermittently matching the first and second neck forming holes. An apparatus for manufacturing aerial installation communication cables, characterized in that the neck portion is formed in the same process.