JP2003227983A - Sz slot, its manufacturing device, and sz type optical fiber cable using sz slot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an SZ slot that enables an optical fiber tape to be surely stored in the slot groove of the SZ slot, and also to provide its manufacturing device and an SZ type optical fiber cable using the SZ slot. <P>SOLUTION: The SZ slot 10 is equipped with a tension member 12 in the center thereof and is formed longitudinally with at least one slot groove 25 inverted for the purpose of storing an optical fiber type 101 on the outer peripheral face. The tension member 12 is composed of a single steel wire having an outer diameter ϕ of 1.4-2.6 mm and a radius of curvature of 160-5,000 mm. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SZ slot, an SZ slot manufacturing apparatus, and an SZ type optical fiber cable using the SZ slot.

[0002]

2. Description of the Related Art Optical fiber cables are widely used in the field of communication. Since the groove rotates in one direction in the conventional S-shaped structure, the optical fiber tape housed in the groove is wound around the central axis. It was difficult to take out the optical fiber tape. Therefore, in recent years, an SZ type structure has been adopted in which the rotation direction of the groove is reversed every pitch. In this SZ type structure, as shown in FIG. 9, the optical fiber tape 1 is inserted into the SZ slot 100.
It houses 01. That is, on the outer peripheral surface of the SZ slot 100, a slot groove 103 whose rotation direction is inverted at the inversion portions 102a and 102b is provided, and the optical fiber tape 101 is accommodated in the slot groove 103. The removal of the tape 101 is very easy.

As shown in FIG. 10, an SZ type optical fiber cable 104 includes an SZ slot 100, a coarse winding 105 around which the SZ slot 100 is wound, an upper winding 106, and a sheath 107 made of a synthetic resin such as polyethylene as the outermost layer. It consists of The SZ slot 100 accommodates an optical fiber tape 101 in which a large number of optical fiber wires, a single optical fiber core wire, or a plurality of optical fiber wires are covered in parallel and collectively. SZ slot 100
Has a tension member 108 arranged at the center, and a plurality of slot grooves 103 provided in the longitudinal direction on the outer peripheral surface.

The SZ slot 100 is shown in FIGS. 9 and 10.
As shown in FIG. 3, a plurality of SZ twisted slot grooves 103 are formed. The structure of this slot groove 103 is SZ
In order to reduce the bending strain in the optical fiber cable 104 as much as possible, the reversal angle (for example, the slot groove 10 at one reversal pitch from the reversal portion 102a to the reversal portion 102b).
3 is set to a predetermined angle. That is,
Within one inversion pitch, when the SZ type optical fiber cable 104 is bent, the extension strain and the compression strain of the optical fibers (collection of the optical fiber tapes 101) accommodated in the slot grooves 103 are offset, and the bending strain (elongation) Is important to be zero.

FIG. 11 shows an SZ by the phase fixing method for housing the optical fiber tape 101 in the slot groove 103.
The configuration of the aggregator 109 is shown. The most upstream side (Fig. 11
An SZ slot supply 110 for supplying the SZ slot 100 is provided on the leftmost side of the drawing, and a dice plate 111 is provided in the center so as to fix the phase, and the most downstream side (the most downstream side in FIG. 11). The right side) is a winder 1 for winding the SZ type optical fiber cable 104.
12 are provided. A brake device 113 is provided on the upstream side of the die plate 111, and a take-up device 114 is provided on the downstream side of the die plate 111, and a certain tension is applied to the SZ slot 100 to pass through the die plate 111. I am trying to do it. Further, on the upstream side of the die plate 111, optical fiber tape supplies 115 for supplying the optical fiber tape 101 to the die plate 111 are provided by the number of the slot grooves 103. On the other hand, on the downstream side of the die plate 111, the optical fiber tape 101 is attached to the SZ slot 10.
A coarse winding head 116 is provided for winding the coarse winding 105 to fix it to 0, and the upper winding 106 is provided further downstream.
An upper winding taping head 117 is provided for winding.

[0006] In the SZ aggregate machine 109 configured as described above, the SZ sent out by the SZ slot supply 110
The Z slot 100 includes a brake device 113 and a take-up device 1.
It passes through the die plate 111 in a state where a predetermined tension is applied in cooperation with 14. At this time, the optical fiber tape 101 supplied by the optical fiber tape supply 115 is connected to the slot groove 103 of the SZ slot 100.
As shown in FIG. 12, the claw 118 of the die plate 111 is inserted into the SZ slot 100 and the slot groove 1
Since the slot groove 103 is fixed to the fixed position by fitting with the slot 03, the SZ slot 100 advances while being alternately inverted right and left before and after the die plate 111. Then, the SZ slot 100 in which the optical fiber tape 101 is housed in the slot groove 103 is roughly wound by the coarse winding head 116 to fix the optical fiber tape 101, and the upper winding taping head 11 is used.
It is wound up by 7 and wound up by a winder 112.

[0007]

By the way, when the optical fiber tape 101 is accommodated in the slot groove 103 of the SZ slot 100 by the SZ assembly machine 109, a good SZ assembly using the SZ slot 100 in which no twist is generated. Then, as shown in FIG. 12, the slot grooves 103a, 103b, ... Of the SZ slot 100 are the die plate claws 11.
8a, 118b ,.

However, when the SZ slot 100 is manufactured, the SZ slot 100 may be twisted. In the SZ set using the SZ slot 100 in which such twist (for example, clockwise twist) occurs,
As shown in FIG. 3, the SZ slot 100 is rotated clockwise by one slot groove 103 and is displaced from the die plate 111. That is, the slot groove 103a is a claw 118b, the slot groove 103b is a claw 118c, ...
… They will fit together. Therefore, the slot groove 103
The optical fiber tape 101 to be housed in the slot groove 103
However, the optical fiber tape 101 cannot be reliably accommodated in the slot groove 103, and the transmission loss may be significantly increased or disconnection may occur. is there. Alternatively, the SZ slot 100 may be damaged, or equipment such as the die plate 111 may be damaged.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to make it possible to surely accommodate an optical fiber tape in a slot groove of an SZ slot.
An object is to provide a slot and SZ slot manufacturing device and an SZ type optical fiber cable using the SZ slot.

[0010]

In order to achieve the above object, the SZ slot according to the present invention has a tension member at the center and an optical fiber tape on the outer peripheral surface as described in claim 1. An SZ slot in which at least one slot groove inverted for accommodation is formed in the longitudinal direction, wherein the tension member has an outer diameter φ1.4 mm to 2.6 mm and a radius of curvature of 1
It is characterized by being a single steel wire of 60 mm to 5000 mm.

When a steel single wire having a weak bending tendency is used as the tension member, a harmful unidirectional twist is generated in the SZ slot, and an optical fiber tape is formed in the slot groove of the unidirectional twist portion by, for example, a phase fixing method. When storing the optical fiber tape, there is a risk that the twisting force causes the slot groove to shift and the optical fiber tape to be housed in the adjacent slot groove. Therefore, the outer diameter and the entire radius of curvature are limited, and a single steel wire having a strong bending tendency is used so that twisting in one direction does not occur in the SZ slot.

In the SZ slot constructed as described above, no harmful unidirectional twist is generated in the SZ slot, so that the optical fiber tape is surely accommodated in the proper slot groove even when accommodated by, for example, the phase locking system. You will be able to do it. Therefore, in this SZ slot, when the optical fiber tape is stored,
It may cause a significant increase in transmission loss or disconnection, or S
It is possible to solve the problem that the Z slot is damaged and the equipment such as the die plate is damaged.

Further, in the SZ slot manufacturing apparatus according to the present invention, as described in claim 2, the outer diameter is φ1.4 at the center.
mm-2.6 mm and radius of curvature 160 mm-5
000mm single steel wire is arranged as a tension member,
Manufacture of an SZ slot by forming a slot core having at least one slot groove inverted in the longitudinal direction for accommodating an optical fiber tape on the outer peripheral surface to manufacture an SZ slot, and winding the SZ slot through an accumulator In the device, the accumulator has a plurality of turn rollers rotatably and a pair of roller groups that are offset from each other and face each other so as to approach and separate from each other within a range of 1 m to 20 m. Has a diameter of 160 mm to 5000 mm.

Here, the pair of roller groups of the accumulator approaches and separates to adjust the length of the storage line of the SZ slot so that the SZ slot can be wound with a predetermined tension. When using a tension member with a relatively high degree of straightness such that the SZ slot exceeds 5000 mm, when the SZ slots that are accumulating due to the approach of both roller groups are ejected, the SZ slots rotate on their own axis. Resulting in. This is because, when the SZ slot is stored due to the separation of the two roller groups, the resistance to torsion becomes smaller as the distance to grip the SZ slot becomes longer, and the SZ slot runs up the roller in the offset roller. It is a phenomenon that occurs because the person cannot overcome the force to try and spin. On the other hand, it has been experimentally found that the phenomenon of twist can be avoided by using a tension member having a radius of curvature of 5000 mm or less. Therefore, when the outer diameter is φ1.4 mm to 2.6 mm, the bending tendency is 160 mm to 5000 mm. The diameter of the turn roller is 160 mm to 5 so as to be suitable for accumulating single steel wire.
000 mm and the distance between both roller groups from 1 m to 2
It was set to 0 m.

In the SZ slot manufacturing apparatus configured as described above, when winding the manufactured SZ slot,
Even if an accumulator that stores a wire by a pair of rollers having multi-stage rollers is used, the SZ slot can be wound without causing harmful unidirectional twisting. Therefore, with this SZ slot manufacturing apparatus, it is possible to manufacture an SZ slot without harmful one-way twist.

Further, as described in claim 3, the SZ type optical fiber cable according to the present invention has a tension member at the center and at least one slot groove which is inverted on the outer peripheral surface is formed in the longitudinal direction. SZ type optical fiber cable having an SZ slot and an optical fiber tape housed in the slot groove, wherein the tension member has an outer diameter φ1.4 mm to 2.6 mm and a radius of curvature of 160 mm to 5000 mm. It is characterized by being a single steel wire.

When a steel single wire having a weak bending tendency is used as the tension member, a harmful unidirectional twist is generated in the SZ slot, and an optical fiber tape is formed in the slot groove of the unidirectional twist portion by, for example, a phase fixing method. When storing the optical fiber tape, there is a risk that the twisting force causes the slot groove to shift and the optical fiber tape to be housed in the adjacent slot groove. For this reason, the outer diameter and the entire radius of curvature are limited so that the SZ slot is not twisted in one direction by using a single steel wire having a strong bending tendency, and the optical fiber tape is housed in the slot groove of the SZ slot. did.

In the SZ type optical fiber cable constructed as described above, no harmful unidirectional twist is generated in the SZ slot, so that even if the optical fiber tape is accommodated by, for example, the phase fixing system, the slot groove is surely secured in a proper slot groove. Will be able to be housed in. Therefore, in this SZ type optical fiber cable, it is possible to solve the problem of causing a significant increase in transmission loss or disconnection, or damage to the SZ slot or equipment such as a die plate as in the conventional case. .

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an SZ slot, an SZ slot manufacturing apparatus, and an SZ type optical fiber cable using the SZ slot according to the present invention will be described below in detail with reference to the drawings. In the embodiments described below, the members already described in FIGS. 9 to 13 will be denoted by the same or corresponding reference numerals in the drawings to simplify or omit the description.

First, the cause of harmful one-way twist that occurs in the SZ slot will be described. FIG. 1 shows an SZ slot manufacturing apparatus 11 for manufacturing the SZ slot 10. In this SZ slot manufacturing apparatus 11, a tension member supply 13 that supplies the tension member 12 is provided on the upstream side (right side in FIG. 1). Downstream of the tension member supply 13,
The feeding device 14, the rotary crosshead 15, and the take-up device 16 are provided.
The rotary crosshead 15 integrally forms the slot core 17 (see FIG. 7) on the outer side of the tension member 12 to which a predetermined tension is applied in cooperation with the take-up device 16.

Between the take-up device 16 and the slot winder 18 that winds the SZ slot 10, the SZ slot 10 is not stopped by the slot winder 18 without stopping the extrusion of the slot core 17 from the rotary crosshead 15. An accumulator 19 for temporarily accumulating the SZ slot 10 is provided in order to supply and wind the wire. The SZ discharged from the take-up device 16
A lateral roller 20 is provided to supply the slot 10 to the accumulator 19, and a free roller 21 is provided to supply the SZ slot 10 discharged from the accumulator 19 to the winder 18. Further, a die mask 22 for monitoring the origin is provided in front of the winding machine 18.

The accumulator 19 is rotatably provided with a fixed side roller group 23F and a movable side roller group 23M. The distance between the two roller groups 23F and 23M is set in the SZ slot 10 wound by the winder 18. Depending on the quantity, the approach or the separation is repeated. That is, when the amount wound by the winder 18 becomes small, the movable side roller group 23M moves away from the fixed side roller group 23F, and the SZ slot 10 is stored between both roller groups 23F and 23M. On the other hand, when the supply from the take-up device 16 decreases while the winder 18 winds, the movable roller group 23M moves and approaches the fixed roller group 23F, and both roller groups 23F, 2F
The SZ slot 10a accumulated in 3M is discharged.

The structure of the accumulator 19 is shown in FIGS. Accumulator 19
In order to store a large number of SZ slots 10a, each roller group 23 is composed of a plurality of independently rotatable rollers 24.
Forming F, 23M. The rollers 24 are offset as shown in FIG. 3 in order to make the rollers 24 multistage, so that the SZ slot 10 a does not interfere inside the accumulator 19.

For this reason, the SZ slot 10a causes a run-up action as shown in FIG. 3, and a force to rotate is generated. When the SZ slot 10a in which the two roller groups 23F and 23M are closely approached and accumulated is short, the rigidity of the SZ slot 10a is advantageous, and thus the rotation action due to the run-up is suppressed, but the two roller groups 23F, Two
If the SZ slot 10a accumulated by separating 3M becomes longer, the force to rotate will win and the SZ slot 10a
It is thought that a twist occurs in the torso and is wound up in this state. Therefore, the moving distance between the two roller groups 23F and 23M is provided with a certain limit so that the SZ slot 10 is not twisted in a certain direction.

4A to 4G show a state in which the twisted SZ slot 10 in the above-described accumulator 19 is wound up. Note that the SZ slot 10 used at this time has an outer diameter of φ9.
0 mm, the outer diameter of the tension member 12 is φ2.3 m
The BL wire has a radius of curvature of 6000 mm and five slot grooves 25.

As shown in FIG. 4 (A), the production is started in a normal operation and the winding by the winding machine 18 is started. In this state, the pair of roller groups 23 of the accumulator 19
F and 23M are approaching and are not accumulating. Therefore, the SZ slot 10 is not twisted. Figure 4
As shown in (B), the winding machine 18 is stopped to intentionally stop the winding, and the movable side roller group 23M is moved to be separated from the fixed side roller group 23F.
The SZ slot 10 is stored. At this time, in the accumulator 19, the SZ slot 10 starts rotating in one direction.

After that, as shown in FIG. 4C, when the winding operation by the winding machine 18 is restarted, the movable roller group 23
M moves and approaches the fixed roller group 23F, and discharges the stored SZ slot 10. As a result, the twist in the accumulator 19 is discharged to the winding side, and the rotary die 22 for monitoring the origin starts to rotate. At this time, a twist component in one direction is inherent in the winder. As shown in FIG. 4 (D), when the length accumulated in the accumulator 19 becomes about 50 m, the one-way component of the rotary die 22 returns to its original state, so that the twist of the SZ slot 10 becomes 3 Reduces to rotation.

Further, as shown in FIG. 4 (E), when the accumulated wire length becomes about 30 m, the one-directional component of the rotary die 22 decreases to two revolutions. Further, as shown in FIG. 4 (F), when the storage line length becomes about 10 m, the one-directional component of the rotary die 22 decreases to one rotation,
As shown in (G), if the manufacturing process is continued after all the storage lines have been discharged, the twist of the SZ slot 10 is eliminated, and the wound SZ slot 10 has a twist of 4 rotations as it is.

FIG. 6 shows the straightness (curvature) of the tension member 12 when a single steel wire having an outer diameter of φ1.4 mm to 2.6 mm is used as the tension member 12 in the SZ slot manufacturing apparatus 11 described above. Radius) and SZ slot 1
The relationship with the number of twists of 0 is shown. In addition, this measurement is a measurement of the number of twists per 100 m generated when the SZ slot 10 is wound by the same steps as in FIGS. 4A to 4G.

As is clear from this figure, the number of twists of the SZ slot 10 increases remarkably from the vicinity of the radius of curvature of the tension member 12 exceeding 5000 mm. It is considered that this is because when the tension member 12 having a radius of curvature of about 5000 mm is used, the tension member 12 cannot withstand rotation and the SZ slot 10 has a twist when wound.

Therefore, as shown in FIG. 7, in the SZ slot 10 according to the embodiment of the present invention, the SZ slot 10 has a tension member 12 at the center and at least one of which is inverted to accommodate the optical fiber tape 101 on the outer peripheral surface. Book slot grooves 25 are formed in the longitudinal direction. here,
As shown in FIG. 8, the tension member 12 has an outer diameter of 1.4 mm to 2.6 mm and a radius of curvature of 16 mm.
It is a single steel wire of 0 mm to 5000 mm.

As shown in FIG. 1, the SZ slot manufacturing apparatus 11 according to the embodiment of the present invention has an outer diameter of 1.4 mm to 2.6 mm at the center and a radius of curvature of 16 mm.
Tension member 1 of 0 mm to 5000 mm single steel wire
2, the SZ slot 10 is manufactured by forming the slot core 17 having at least one slot groove 25 in the longitudinal direction, which is inverted to accommodate the optical fiber tape 101 on the outer peripheral surface, to manufacture the SZ slot 10. It is wound up through the accumulator 19.

Here, the accumulator 19 has a plurality of turn rollers 24 rotatably, and has a pair of roller groups 23F and 23M which are offset from each other and face each other so as to approach and separate from each other within a range of 1 m to 20 m. The turn roller 24 has a diameter of 160 mm to 5000 mm.

Further, as shown in FIG. 7, in the SZ type optical fiber cable 26 according to the present invention, the tension member 12 as described above is provided at the center, and at least one slot groove 25 reversed is provided on the outer peripheral surface. It has an SZ slot 10 formed in the longitudinal direction, and this slot groove 2
5, the optical fiber tape 101 is accommodated, and the tension member 12 has an outer diameter of 1.4 mm to 2.6 m.
m is a single steel wire having a radius of curvature of 160 mm to 5000 mm.

From the above results, the above-mentioned SZ slot 1
0 and the SZ slot manufacturing apparatus 11 and the SZ type optical fiber cable 26 using the SZ slot 10, by using a single steel wire having a strong bending habit as the tension member 12, it is possible to prevent the SZ slot 10 from being damaged in one direction. Since the occurrence of twisting can be prevented, the optical fiber tape 101 can be reliably accommodated in the proper slot groove 25 when it is accommodated by, for example, the phase fixing method. As a result, when the optical fiber tape 101 is housed, it is possible to prevent a significant increase in transmission loss or disconnection, or prevent damage to the SZ slot 10 or equipment such as the die plate 111.

The SZ slot and S according to the present invention are
Z slot manufacturing device and SZ using SZ slot
The optical fiber cable is not limited to the above-described embodiments, but can be appropriately modified and improved.

[0037]

As described above, the S according to the present invention is as described above.
According to the Z slot and SZ slot manufacturing apparatus and the SZ type optical fiber cable using the SZ slot, S
Since it is possible to prevent the harmful one-direction twist from occurring in the Z slot, it is possible to surely store the optical fiber tape in the proper slot groove when the optical fiber tape is stored by, for example, the phase fixing method. As a result, when the optical fiber tape is accommodated, it is possible to prevent a significant increase in transmission loss or disconnection, or to prevent damage to the SZ slot or equipment such as the die plate.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an SZ slot manufacturing apparatus according to the present invention.

FIG. 2A is a plan view of an accumulator,
(B) is a front view seen from the direction B in (A).

FIG. 3 is an explanatory diagram showing a principle of generating unidirectional twist in an SZ slot.

4 (A) to (G) are stage explanatory views showing a state in which one-directional twist is accumulated in the SZ slot in the accumulator.

FIG. 5 is a sectional view of an SZ slot used for measurement.

[Fig. 6] Straightness (radius of curvature) of tension member and S
It is a chart showing the relationship with the number of twists of the Z slot.

FIG. 7 is a perspective view showing an SZ slot and an SZ type optical fiber cable according to the present invention.

FIG. 8 is a front view showing a tension member of the SZ slot according to the present invention.

FIG. 9 is an explanatory diagram showing the principle of an SZ slot used conventionally.

FIG. 10 is a perspective view showing an SZ slot and an SZ type optical fiber cable which have been conventionally used.

FIG. 11 is a configuration diagram showing a conventional SZ aggregate machine.

FIG. 12: Normal S properly held on the die plate
It is sectional drawing of a Z slot.

FIG. 13 is a cross-sectional view of an SZ slot improperly held on a die plate.

[Explanation of symbols]

10 SZ slots 11 SZ slot manufacturing equipment 12 tension members 17 slot core 19 Accumulator 23 Roller group 24 turn rollers 25 slot groove 26 SZ type optical fiber cable 101 optical fiber tape

Claims (3)

[Claims] 1. An SZ slot having a tension member in the center and at least one slot groove inverted to accommodate an optical fiber tape in the outer peripheral surface is formed in the longitudinal direction, wherein the tension member comprises: Outer diameter φ1.4 mm to 2.6
mm, and the radius of curvature is 160 mm to 5000 mm
An SZ slot characterized by being a single steel wire. 2. The outer diameter is 1.4 mm to 2.6 mm at the center.
And a single steel wire having a radius of curvature of 160 mm to 5000 mm is arranged as a tension member, and a slot core having at least one slot groove inverted in the longitudinal direction for accommodating the optical fiber tape is formed on the outer peripheral surface. S
An SZ slot manufacturing apparatus for manufacturing a Z slot and winding the SZ slot through an accumulator, wherein the accumulator has a plurality of turn rollers rotatably and offset from each other for 1 m to 2 m.
An SZ slot manufacturing apparatus having a pair of roller groups facing each other so as to be able to approach and separate in a range of 0 m, and the turn roller has a diameter of 160 mm to 5000 mm. 3. An SZ type light having a tension member at the center and an SZ slot in which at least one slot groove inverted on the outer peripheral surface is formed in the longitudinal direction, and an optical fiber tape is accommodated in the slot groove. A fiber cable, wherein the tension member has an outer diameter of 1.4 mm to 2.6 mm.
mm, and the radius of curvature is 160 mm to 5000 mm
SZ type optical fiber cable characterized by being a single steel wire.