JPH10300999A - Method of manufacturing sz slot type optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an optical fiber core to be surely and efficiently inserted by turning a second core position adjustment rotary plate (rotary plate) so that a twist angle of an optical fiber insertion hole satisfies a specific value. SOLUTION: An inversion pitch of a groove 21 is expressed by p, an inversion angle by γ, a layer core radius of an optical fiber core by (a), an each distance from a housing position to rotary plates 2, 3 by s, l, a twist angle of the groove 21 by θ, respectively, and a rotary plate 3 is made to be within a range of a value which the optical fiber core insertion hole obtains from an equation I when θ is set from θ=0 or γ up to θ=γ/2. And, SZ slots and the optical fiber cores 22 are sequentially housed while being drawn in. In an equation II, when a value is assumed to be α(θ=0) when θ=0, and α(θ=γ) when θ=γ, the rotary plate 3 is turned so that the twist angle α satisfies the relation, α=[α(θ=γ)-α(θ=0)]/γ.θ+α(θ=0).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an SZ slot type optical fiber cable, and more particularly to a method of manufacturing an SZ slot type optical fiber cable capable of securely and efficiently receiving an optical fiber core in a slot groove. It relates to a manufacturing method.

[0002]

2. Description of the Related Art An SZ slot type optical fiber cable is an SZ slot type optical fiber cable in which a slot groove alternately repeats S twist and Z twist.
Using a slot formed in a Z twist,
It is excellent in operability when branching the optical fiber housed in the slot groove.

FIGS. 10 and 11 show an example of a self-supporting type optical fiber cable using this type of SZ slot type optical fiber cable. FIG. 10 is a sectional view, and FIG. It is the top view shown. This self-supporting type optical fiber cable has a structure in which a supporting wire 11 and an SZ slot type optical fiber cable 13 are integrated by a connecting portion 12. The support wire 11 includes a support wire main body 14 made of a galvanized steel twisted wire or the like, and a covering 15 made of a synthetic resin such as polyethylene which covers the support wire main body 14. The connecting portion 12
The support wire 11 and the optical fiber cable 13 are connected and integrated so that the optical fiber cable 13 is hung by the support wire 11. The support wire 11 hangs down from the bottom of the support wire 11 and extends to the top of the optical fiber cable 13. It is a wall-shaped member having a continuous and constant thickness, and is made of a synthetic resin such as polyethylene.

[0004] The optical fiber cable 13 comprises a cable core 16 and a sheath 17 made of a synthetic resin such as polyethylene which covers the cable core 16.
The cable core 16 has a structure in which a presser winding 19 is provided on an SZ slot 18.
Has a tensile strength line 20 at the center thereof, and has a plurality of grooves 21 along the longitudinal direction on the outer periphery.

[0005] The slot groove 21 is formed so as to be SZ twisted. Here, the portion represented by the broken line TT which is twisted from the S twist to the Z twist (or from the Z twist to the S twist) is called an inversion portion, and an intermediate point from the inversion portion to the inversion portion represented by the broken line RR is referred to as an inversion portion. It is called a rotating part. In the slot groove 21, a single-core or two-core optical fiber
4 are stored.

This SZ slot type optical fiber cable 1
3, when the back branching is performed, as shown in FIG. 11, after the presser winding 19 and a part of the sheath 17 are peeled off from the slot 18, the optical fiber core wire 24 is removed from the slot 18 at the inversion portion (T). Release and work. As described above, in the SZ slot type optical fiber cable, unlike the one-way twisted cable, the optical fiber core 24 can be easily formed at the inversion portion (T).
Can be taken out.

The above SZ slot type optical fiber cable 1
In order to manufacture No. 3, for example, the following is performed. FIG.
This shows an example of a manufacturing apparatus used for manufacturing the optical fiber cable 13, and the manufacturing apparatus shown here is the first type.
And second optical fiber core position adjusting rotary plates 32, 33
And a storage die 1.

The first and second optical fiber core position adjusting rotary plates 32 and 33 adjust the position of the optical fiber core with respect to the slot, and arrange the optical fiber core at a position where the optical fiber core can be easily accommodated in the slot groove. Each is formed in a disk shape and is supported so as to be rotatable in the circumferential direction. The rotating plates 32 and 33 are connected and integrated with each other via a connecting portion 34. Openings 32b and 33b serving as slot insertion portions are formed near the centers of the rotating plates 32 and 33, and a plurality of openings for inserting the optical fiber core wire 24 are provided at positions on the peripheral side of the openings 32b and 33b. Insertion holes 32a, 33
a is provided. These insertion holes 32a, 33a are
The same number as the number of slot grooves is provided in the circumferential direction of the rotating plates 32 and 33.

An introduction pipe 35 is attached to the insertion hole 32a of the second rotary plate 32. This introduction pipe 3
Numeral 5 is for introducing an optical fiber core wire into the slot groove.
Further, a slot phase detection pin 36 protruding toward the opening 32b is fixed to the rotating plate 32. This detection pin 3
6 is provided so as to be inserted into the slot groove when the slot is inserted through the opening 32b. The accommodating die 1 is for accommodating the optical fiber in the slot groove of the slot, and is a cylindrical body having a minimum inner diameter substantially equal to the outer diameter of the slot.

In this method, first, the slot 18 is sequentially inserted through the openings 33b and 32b of the rotating plates 33 and 32 and the housing die 1, and is taken out at a constant speed in the direction of the arrow in the figure. At this time, the slot phase detection pin 36 provided on the rotary plate 32 is inserted into the slot groove 21. Also, the tip of the introduction pipe 35 is
Inside the slot groove 21. At the same time, the optical fiber 24 is inserted into the insertion hole 33 of the rotating plate 33.
a, via the introduction pipe 35, in a state of being located in the slot groove 21 of the slot 18 located in the accommodation die 1,
It is picked up at the above-mentioned constant speed in the direction of the arrow in the figure.

As the slot 18 is pulled, the phase of the slot groove 21 of the slot 18 located in the opening 32b of the rotating plate 32 changes. At this time, since the phase detection pin 36 is inserted into the slot groove 21, the rotation plate 32 and the rotation plate 33 to which the detection pin 36 is fixed are rotated in the circumferential direction in accordance with the phase of the slot groove 21. Accordingly, the optical fiber core wire 2 inserted through the introduction pipe 35
4 is arranged at a position corresponding to the phase of the slot groove 21.
Since the slot groove 21 of the slot 18 is formed in an SZ twist, the rotating directions of the rotating plates 32 and 33 are reversed every predetermined slot take-off distance. After passing through the introducing pipe 35, the optical fiber core 24 is
It will be accommodated sequentially inside.

In this way, after the optical fiber core wire 24 is accommodated in the slot groove 21 of the slot 18, the outer periphery of the slot 18 is subjected to a coarse winding made of nylon yarn or the like and a press winding 19 made of non-woven fabric or the like. The cable core 16 is manufactured, and the cable core 16 and the support wire main body 14 are collectively covered to obtain a self-supporting optical fiber cable having the optical fiber cable 13.

In recent years, with the increase in the number of users, there has been a demand for an increase in the number of optical fiber cables, and 2 to 10 multi-core tapes such as 4 to 16 cores are laminated to form slot grooves. There has been proposed an SZ slot type optical fiber cable housed therein. FIG. 13 shows an example of a self-supporting type optical fiber cable using this type of SZ slot type optical fiber cable. The optical fiber cable 43 of the self-supporting type optical fiber cable shown here is different from the above-mentioned optical fiber cable 13 in that the optical fiber cable 2 such as 4 to 16 fibers is inserted into the slot groove 21.
2 laminated optical fiber tape core 2
3 is accommodated. The SZ slot type optical fiber cable having such a structure is described in detail in Japanese Patent Application No. 8-320334, which has already been applied for a patent by the present applicant.

FIG. 14 is a model diagram showing a state in which the optical fiber ribbon 22 of the SZ slot type optical fiber cable 43 is accommodated in the slot groove 21. The state of the optical fiber ribbon 22 that changes in the cable length direction from the part (T) to the other reversing part (T) through the rotating part (R) is shown in a cross-sectional view. is there.

In the rotating part (R), the optical fiber ribbon 22 is arranged so that its width direction (the direction of arrangement of the optical fibers) is substantially orthogonal to the central axis C of the slot groove 21. Then, with reference to the width direction of the optical fiber ribbon 22 in the rotating portion (R), the width direction of the optical fiber ribbon 22 from the inversion portion (T) to another inversion portion (T) is determined. The laminated body 23 is twisted back and accommodated in the slot groove 21 while maintaining the laminated state so as to be always substantially parallel to the width direction of the optical fiber ribbon 22 in the rotating part (R). (This state is said to be assembled with twisting). FIG.
In FIG. 4, the state of one slot groove 21 is shown, but the stacked body 23 accommodated in the other slot grooves 21 is in the same state. Further, the twist angle from one reversal part (T) to the other reversal part (T), that is, FIG.
Is called an inversion angle.

In the SZ slot type optical fiber cable 43 having the above-described configuration, the optical fiber ribbon 22 always has the width direction of the optical fiber ribbon 2 at the rotating portion (R).
2 is housed in the slot groove 21 so as to be substantially parallel to the width direction of the optical fiber ribbon 2, so that stress is applied to the optical fiber ribbon 22 such as cable rewinding and heat cycling. Even in the lower part, the stress does not concentrate locally, and the transmission characteristics are hardly deteriorated.

[0017]

However, when the above-described manufacturing method is employed to manufacture the SZ slot type optical fiber cable having the above-described structure, the following problem may occur. In the above manufacturing method, in particular, the slot 18
When the take-up speed is increased, the introduction pipe 35 may be broken due to friction with the slot 18 or external force applied by the slot 18. For this reason, there has been a demand for a method capable of securely and efficiently housing the optical fiber core wire in the slot groove without using the introduction pipe 35. In addition, as the rotating plates 32 and 33 rotate, the introduction pipe 35 rotates in the circumferential direction of the slot 18, so that the stacked body 23 is always accommodated in the slot groove 21 with the width direction substantially constant. When the rotating plates 32 and 33 rotate, a large force in the pipe circumferential direction is applied to the laminate 23 by the inner wall of the introduction pipe 35,
In some cases, the optical fiber ribbons 22 constituting the laminated body 23 are housed in the slot grooves in a state where the lamination state is displaced from each other and the laminated state is broken, and this may cause deterioration of the transmission characteristics of the cable. The present invention has been made in view of the above circumstances, and is capable of reliably and efficiently accommodating an optical fiber core in a slot groove, and further comprising a plurality of optical fibers as an optical fiber core accommodated in the slot groove. It is an object of the present invention to provide a method capable of manufacturing an SZ slot type optical fiber cable having excellent transmission characteristics while maintaining a good laminated state when a tape core is used.

[0018]

According to the present invention, there is provided a method for manufacturing an SZ slot type optical fiber cable, comprising:
A method for manufacturing an SZ slot type optical fiber cable accommodated in a slot of an SZ slot using first and second core position adjusting rotary plates, wherein the first and second core position adjusting rotary plates are provided. An opening provided in the vicinity of the center and serving as a slot insertion portion, and an optical fiber core wire insertion hole provided on a peripheral side of the opening, and the inversion pitch of the slot groove is p, and the inversion angle is Is γ, a is the layer core radius of the optical fiber core when accommodated in the slot groove, and s is the distance from the position where the optical fiber core is accommodated in the slot groove to the first core position adjusting rotary plate. When the distance from the position to the second core position adjusting rotary plate is l and the twist angle of the slot groove at the position is θ, the second core position adjusting rotary plate is When the layer core radius of the hole is θ = Or from the value when the gamma,
is in the range of values when θ = γ / 2,

(Equation 3) The SZ slot is inserted through the openings of the first and second core position adjusting rotary plates, and the optical fiber core is inserted through the optical fiber core insertion holes of these rotary plates.
While taking the slot and the optical fiber core, the optical fiber core is sequentially accommodated in the slot groove. In the following (II), the value when θ = 0 is α (θ = 0), and when θ = γ Is defined as α (θ = γ), the twist angle α of the optical fiber core insertion hole of the second core position adjusting rotary plate is defined as α = ｛α (θ = γ) − α (θ = 0)｝ / γ · θ + α (θ
= 0).

(Equation 4) Further, as a first core position adjusting rotary plate, a positioning member rotatable with respect to the rotary plate is provided on a peripheral side from an opening of the rotary plate, and the positioning member includes An optical fiber core insertion hole may be provided, and the insertion hole may have a shape along the cross-sectional shape of the laminated optical fiber tape core.

[0019]

1 to 5 show an SZ according to the present invention.
1 shows a manufacturing apparatus used to carry out an example of a method for manufacturing a slot type optical fiber cable. The manufacturing apparatus shown here comprises a receiving die 1, first and second core position adjusting rotary plates 2, 3, and a slot phase detecting eye plate 4.
And

The accommodating die 1 is for accommodating the above-mentioned optical fiber ribbon in the slot groove, is a cylindrical body having a minimum inner diameter substantially equal to the outer diameter of the slot, and has an inner diameter on the side of the rotary plate 2 slightly. The diameter is increased.

The first core wire position adjusting rotary plate 2 is for arranging the optical fiber tape core wire at a position where it can be easily accommodated in the slot groove, and is formed in a disk shape and is rotatable in the circumferential direction. It is supported by. An opening 2b serving as a slot insertion portion is formed in the vicinity of the center of the rotating plate 2, and a plurality of optical fiber insertion holes 2a are provided at positions on the peripheral side of the opening 2b.
Is provided. The number of the insertion holes 2 a is equal to the number of the slot grooves in the circumferential direction of the rotating plate 2.

A plurality of disc-shaped positioning members 5 are provided on the surface of the rotary plate 2 opposite to the side of the storage die 1 so as to cover the insertion holes 2a. These positioning members 5 are for laminating a plurality of optical fiber tape cores and sending them to the housing die 1 as a laminated body. The positioning members 5 are formed in a disk shape, and are turned around the rotary plate 2 in the circumferential direction thereof. It is provided movably. The positioning member 5 is provided with an optical fiber core insertion hole 5a for inserting an optical fiber tape core, and the insertion hole 5a is provided with a plurality of stacked optical fiber tape cores 22 (laminated body). 23) It is formed in a rectangular shape along the cross-sectional shape.

The rotating plate 2 is moved from a position for accommodating the optical fiber ribbon in the slot groove (hereinafter referred to as a core accommodating position).
, That is, the distance from the core wire accommodating position to the positioning member 5 (the distance s shown in FIG. 1) is set to about 5 to 50 cm. The rotary plate 2 is provided with a phase adjuster (not shown), which can be used to adjust the phase of the rotary plate 2 to an arbitrary position.

The second core wire position adjusting rotary plate 3 is provided at a position where the optical fiber ribbon is easily accommodated in the slot groove and maintains the twisted state of the optical fiber ribbon 22 in a good condition. And is formed in a disk shape with an outer diameter of about 1.5 to 10 cm, and is supported so as to be rotatable in the circumferential direction. The rotary plate 3 is provided with an opening 3b serving as a slot insertion portion near the center, and a plurality of optical fiber core insertion holes 3a at a position on the peripheral side of the opening 3b. The number of the insertion holes 3 a is equal to the number of the slot grooves in the circumferential direction of the rotating plate 3.

A plurality of disc-shaped positioning members 6 are provided on the surface of the rotating plate 3 on the side opposite to the housing die 1 so as to close the insertion holes 3a. The positioning member 6 is for maintaining the twisted state of the optical fiber ribbon 22 in a favorable state, and is provided rotatably in its own circumferential direction with respect to the rotating plate 3. The source can be rotated at any speed and direction.
The positioning member 6 is provided with an optical fiber core insertion hole 6 a, and the insertion hole 6 a is formed in a shape along the cross-sectional shape of the optical fiber tape core 22. The distance from the core wire accommodating position in the accommodation die 1 to the rotary plate 3, that is, the distance from the core wire accommodating position to the positioning member 6 (the distance 1 shown in FIG. 1) is set to about 5 to 30 cm.

The insertion hole 6a of the positioning member 6 has an inversion pitch of the slot groove of the SZ slot type optical fiber cable to be manufactured, that is, the distance between two adjacent inversion portions is p,
The inversion angle is γ, the layer core radius of the optical fiber core wire when housed in the slot groove 21, that is, the distance from the slot center axis is a, the distance from the core wire accommodation position to the rotary plate 2 is s, Assuming that the distance from the position to the rotating plate 3 is l, the layer center radius, that is, the distance b from the center of the rotating plate 3 shown in FIG.
From the value when θ = 0 or γ in (I) below,
It is assumed that the value is in the range of the value when θ = γ / 2. The reason for providing the insertion hole 6a at this position will be described later.

(Equation 5)

The rotating plate 3 is provided with a phase adjuster (not shown), which can be used to adjust the phase of the rotating plate 3 to an arbitrary position.

The slot phase detecting eye plate 4 is for detecting the phase of the slot groove of the SZ slot, is formed in a disk shape, and is supported rotatably in the circumferential direction. Eyeboard 4
An opening 4b serving as a slot insertion portion is formed in the vicinity of the center. At the inner edge of the opening 4b, there is provided a phase detection projection 4a that fits into the slot groove when a slot is inserted into the opening 4b.

The slot phase detecting eye plate 4 is provided with a phase detector (not shown) for detecting the phase of the eye plate 4, and the phase detector is used to detect the position of the portion located in the opening 4b. The phase of the slot groove of the slot can be detected. The distance between the slot phase detection eye plate 4 and the core wire accommodation position in the accommodation die 1 is the distance from the inverted portion (T) of the slot groove to another inverted portion (T) adjacent thereto, or The phase of the slot groove detected by the slot phase detecting eye plate 4 is equal to the phase of the slot groove at the core wire accommodating position. This phase detector is provided by the first
And a phase adjuster provided on the second rotating plates 2 and 3, so that the phases of the rotating plates 2 and 3 can be arbitrarily set in accordance with the phase of the slot groove detected by the phase detector. I can do it.

Next, taking the case where the above-mentioned apparatus is used as an example,
An example of the method for manufacturing the SZ slot type optical fiber cable of the present invention will be described. In the method of this example, first, the SZ slot 18 is passed through the openings of the accommodation die 1, the first and second core position adjustment rotary plates 2 and 3, and the slot phase detection eye 4 in order. It is picked up at a constant speed in the direction of the arrow in the figure. At this time, the phase detection projection 4a of the slot phase detection eye 4 is disposed in the slot groove 21.

At the same time, after inserting a plurality of, preferably 2 to 10 optical fiber ribbons 22 into the insertion holes 6 a of the positioning member 6 provided in the second core position adjusting rotary plate 3. Then, after being stacked and inserted into the insertion hole 5a of the positioning member 5 provided on the first core wire position adjusting rotary plate 2, the positioning member 5 is guided into the housing die 1 where it is positioned in the slot groove 21 of the slot 18. In the state shown in FIG.

As the slot is taken out, the phase of the slot groove 21 of the slot 18 at the portion located in the opening 4b of the slot phase detecting eyeplate 4 changes. On this occasion,
Since the phase detecting projection 4a is arranged in the slot groove 21, the slot phase detecting eye 4 rotates in the circumferential direction in accordance with the position of the slot groove 21, and the phase of the slot groove 21 in the opening 4b. Is detected by the phase detector. As described above, the slot groove 2 in the slot
Since the phase of the slot 1 is equal to the phase of the slot groove 21 at the core wire accommodating position in the accommodating die 1, the detector can know the phase of the slot groove 21 at the core wire accommodating position.

In the manufacturing method of this embodiment, the phase adjuster provided on the rotating plate 3 is driven in accordance with the phase of the slot groove 21 at the core wire accommodating position detected by the phase detector, as described below. Then, the rotating plate 3 is rotated. That is, the twist angle of the slot groove 21 at the core wire accommodating position based on the twist angle (phase) at one inversion portion (T) of the slot groove 21 is θ, and when θ = 0 in the following (II), The value is α (θ = 0), and the value when θ = γ is α (θ = γ)
, The twist angle α of the insertion hole 6a through which the optical fiber ribbon 22 to be inserted into the slot groove 21 of the rotating plate 3 is α = ｛α (θ = γ) −α (θ = 0 )｝ / Γ · θ + α (θ = 0)... (III)

(Equation 6)

By rotating the core position adjusting rotary plate 3 so that the twist angle of the insertion hole 6a satisfies the above formula (III), the optical fiber ribbon 22 is securely accommodated in the slot groove 21. Will be done. This is for the following reason.

FIG. 6 shows the slot 18 and the slot groove 21.
1 schematically shows a positional relationship with an optical fiber core housed in the optical fiber. In FIG. 6, the coordinates of a point G at which the line extending in the tangential direction of the slot groove 21 a at the core wire accommodation position D, that is, the extension line E, intersects the surface F along the rotary plate 3 are the coordinates of the slot at the core wire accommodation position D. When the center is set as the origin, and the z-axis is set in the slot axis direction, and the x-axis and the y-axis are set along the plane F, the coordinates are represented by the following coordinates (IV).

(Equation 7)

That is, if the optical fiber core insertion hole 6a of the core position adjusting rotary plate 3 is always arranged at a position that satisfies the coordinates (IV), the optical fiber tape core 22 is always in the tangential direction of the slot groove 21. Can be accommodated in the slot groove 21. However, it is difficult to always arrange the insertion hole 6a at a position that satisfies the coordinates (IV) by rotating the core position adjusting rotary plate 3. This is for the following reason.

FIG. 7 shows that, based on the coordinates (IV), the slot groove inversion pitch p is 125 mm, the inversion angle γ is 275 degrees,
The layer core radius a of the optical fiber core wire when housed in the slot groove is 3.6 mm, the distance s from the core wire accommodation position to the rotary plate 2 is 25 mm, and the distance l from the core wire accommodation position to the rotary plate 3 is When the length is set to 75 mm, while the slot groove 21 extends from the inverted portion to another inverted portion at the core wire accommodating position, the tangential extension of the slot groove 21 at the core wire accommodating position is formed on the surface along the rotating plate 3. The coordinates of the intersecting points are shown with the center of the slot as the origin. As shown in FIG. 7, the intersection of the extension line and the surface and the center (origin) of the slot 18
Is complicatedly changed according to the phase of the slot groove at the core wire accommodating position.

Curve A shown in FIG. 8 is based on the twist angle of the slot groove in one inversion portion as a base point, and the twist angle of the slot groove 21 at the core wire accommodating position from the inversion portion to the other inversion portion ( The horizontal axis) and the twist angle at the intersection (vertical axis) are plotted. Here, the twist angle at the intersection is indicated by an angle α in FIG.
(However, the base point of twist angle of the inverted portion T ₁ of the slot groove 21a.) As shown in this figure, the twist angle of the intersection point is not proportional to the twist angle of the slot grooves of the cord receiving position It changes in a complicated way. As described above, the distance and the phase from the center axis of the slot groove 21 at the intersection change in a complicated manner according to the phase of the slot groove at the core wire accommodating position.
It is difficult to always arrange the insertion hole 6a at the intersection by rotating the core position adjusting rotary plate 3.

Therefore, in the manufacturing method of this example, first, the layer center radius b of the insertion hole 6a is made constant to facilitate control of the rotary plate 3. The layer center radius b is as described above.
From the value when θ = 0 or γ in (I), θ =
It is assumed that the value is in the range of the value when γ / 2 is set. This is because these values correspond to the minimum value (when the slot groove at the core wire accommodating position is in the inverted portion) and the maximum value (when the core groove accommodating position is between the intersection indicated by the coordinates (IV) and the slot center). (When the slot groove is in the rotating portion). Also, to securely store the core wire in the slot groove,
The rotation plate 3 is inserted into the insertion hole 6a so that the optical fiber core is located at the point indicated by the coordinates (IV) at the reversal part where the accident that the core is detached from the slot groove is most likely to occur when the core is accommodated. Is the minimum value of the layer core radius b, that is,
In (I), it is preferable to use one provided at a position where the value becomes θ = 0 or γ.

In order to adjust the position of the optical fiber insertion hole 6a by a simple control, the twist angle of the insertion hole 6a is easily adjusted with respect to the twist angle of the slot groove 21 at the core receiving position. It is preferable to rotate the rotating plate 3 so as to have a proportional relationship. Furthermore, in order to securely accommodate the core wire in the slot groove, the optical fiber core wire is indicated by the above coordinates (IV) at the inversion portion where the accident that the core wire comes off from the slot groove when the core wire is accommodated is most likely to occur. Is preferably located at the point where In this way, the twist angle of the insertion hole 6a is made to be proportional to the twist angle of the slot groove 21 at the core wire accommodating position, and the core wire has the above-mentioned coordinates (IV) at the slot groove reversal part.
In order to be located at the point indicated by
The relationship between the twist angle of the slot groove 21 at the core wire accommodating position and the twist angle at the intersection when the is rotated is, for example, as shown by the symbol B in FIG.
When the twist angle is 0 degree and when the inversion angle is γ, a straight line that intersects the curve A based on the coordinates (IV), that is, a straight line B may be formed.

The inclination of this straight line B is defined as α (θ = 0) when the twist angle θ of the slot groove at the core wire accommodating position is 0 degree, and the twist angle of the slot groove at the core wire accommodating position is defined as α (θ = 0). When the angle θ is the reversal angle γ, the twist angle at the intersection is α
When (θ = γ), it is represented by the following (V). (Α (θ = γ) −α (θ = 0)) / γ (V) The intercept of the straight line B is, as apparent from FIG.
(Θ = 0). The above equation (III) is obtained from these slopes and intercepts.

By rotating the core position adjusting rotary plate 3 as described above, the optical fiber ribbon 22 is always kept at a position close to the tangential direction of the slot groove 21 at the core receiving position. It is accommodated in the groove 21. Further, when the inverted portion of the slot groove 21 is disposed at the core wire accommodating position in the process of taking out the slot 18, the optical fiber ribbon 22 completely matches the tangential direction of the slot groove 21.

On the other hand, the rotating plate 2 may be rotated so that the twist angle of the insertion hole 5a is substantially equal to the twist angle θ of the slot groove.

At the same time, the positioning member 6 provided on the rotating plate 3 is forcibly moved by a driving source (not shown).
, The width direction of the optical fiber ribbon 22 may always be perpendicular to the center axis C of the slot groove 21 of the rotating part (R). As a result, the laminate 23 including the optical fiber ribbons 22 is forcibly turned into a twisted state.

Since the laminated body 23 is formed by laminating a large number of optical fiber ribbons 22, it is difficult to bend in both the width direction and the thickness direction and is not easily twisted. For this reason, when the rotating plate 2 rotates, the positioning member 5 rotates the laminated body 2.
3 is applied with a stress in a direction to twist it, but the positioning member 5 rotates in its own circumferential direction according to the phase change of the rotating plate 2, and the width direction of the laminated body 23 is always kept constant. . For this reason, the laminate 23 is not twisted,
Is always substantially parallel to the width direction of the optical fiber ribbon 22 in the rotating portion of the slot groove 21.

The rotating plate 2 has an optical fiber core insertion hole 5a.
Is provided, and the insertion hole 5a has a shape conforming to the cross-sectional shape of the laminated body 23, so that the optical fiber ribbon 22 maintains the laminated state while maintaining the twisted state. Is supplied into the accommodation die 1 as a laminated body 23 in a regular state without collapse, and is accommodated in the slot groove 21 of the slot 18.

As described above, the optical fiber ribbon 2
2 is accommodated in the slot groove 21, a coarse winding made of nylon yarn or the like is applied on the slot 18, and a press winding 19 made of a nonwoven fabric or the like is applied to produce the cable core 16. 14 are collectively covered with a resin such as polyethylene to obtain a self-supporting type optical fiber cable having the SZ slot type optical fiber cable 43.

In the above manufacturing method, as the rotating plate 3, the layer core radius b of the optical fiber core insertion hole 6a is set to
From the value when θ = 0 or γ in (I), θ =
The value within the range of γ / 2 is used, and the rotating plate 3
The twist angle α of the optical fiber core insertion hole 6a is determined by the above equation.
Since the optical fiber ribbon 22 is accommodated in the slot groove 21 while rotating so as to satisfy the simple relationship shown in (III), the optical fiber ribbon 22 is always inserted into the slot groove 21 at the core accommodating position. It can be accommodated in the slot groove 21 while being arranged in a direction close to the tangential direction. Therefore, when the optical fiber ribbon 22 is accommodated in the slot groove 21, the optical fiber ribbon 22 is
Accidents deviating from 1 can be prevented beforehand, and the core can be accommodated reliably, efficiently, and easily.

Further, the optical fiber ribbon 22 is made to completely coincide with the tangential direction of the slot groove 21 when the inverted portion of the slot groove 21 is disposed at the core wire receiving position,
It is possible to prevent the optical fiber from coming off the slot groove 21 when the optical fiber is accommodated, and to more surely accommodate the optical fiber ribbon 22 in the slot groove 21.

As the core position adjusting rotary plate 2, a positioning member 5 rotatable with respect to the rotary plate 2 is provided. The positioning member 5 is provided with an optical fiber core wire insertion hole 5a.
By using the insertion hole 5a having a shape conforming to the cross-sectional shape of the laminated optical fiber ribbon 22, the optical fiber ribbons 22 are laminated in a regular state and the slot 22 is formed in the slot groove 21. Can be accommodated. Therefore, the laminated state of the optical fiber ribbons 22 in the slot groove 21 is good, and an SZ slot type optical fiber cable having excellent transmission characteristics can be manufactured.

Further, a plurality of optical fiber ribbons 2
2 through the optical fiber core insertion hole 6a formed in the positioning member 6 of the rotary plate 3, the positioning member 6 is forcibly rotated with respect to the rotary plate 3, and
By accommodating 2 in the slot groove 21 while twisting, the twisted state of the optical fiber ribbon 22 in the slot groove 21 can be kept good. Further, even if the take-up speed of the slot 18 and the optical fiber ribbon 22 is increased, the optical fiber ribbon 22 can be accommodated in the slot 21 without twisting, and the production efficiency can be increased. .

In the above method, the positioning members 5 and 6 provided on the core position adjusting rotary plates 2 and 3 are connected to the rotary plates 2 and 3 respectively.
3 is provided on the slot phase detection eye plate 4 side.
The present invention is not limited to this, and as shown in FIG. The positioning member 5 of the rotating plate 2
May be forcibly rotated with respect to the rotating plate 2 so that the width direction of the optical fiber ribbon 22 is always substantially constant. In addition, although the optical fiber ribbon is used as the optical fiber to be accommodated in the slot groove 21, it is not limited to this, and an arbitrary number of fibers such as a single core or a two core type may be used. .

[0053]

According to the method of manufacturing an SZ slot type optical fiber cable of the present invention, the optical fiber position adjusting rotary plate having the optical fiber core insertion hole through which the optical fiber core is inserted is rotated to rotate the optical fiber. The core wire is always accommodated in the slot groove while being arranged in a direction close to the tangential direction of the slot groove.
Therefore, when the optical fiber is accommodated in the slot groove, an accident that the optical fiber core comes off the slot groove can be prevented beforehand, and the core can be reliably, efficiently and easily accommodated.

Further, as a core position adjusting rotary plate, there is provided a positioning member rotatable with respect to the rotary plate, and the positioning member is provided with an optical fiber core wire insertion hole, and the insertion hole is laminated. When the optical fiber ribbon is used as the optical fiber ribbon by using a shape that is in accordance with the cross-sectional shape of the optical fiber ribbon in the state of
The optical fiber ribbons can be stacked in a neat state and housed in the slot grooves. Therefore, the laminated state of the optical fiber ribbon is good, and S is excellent in transmission characteristics.
A Z-slot optical fiber cable can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a manufacturing apparatus used to carry out an example of a method of manufacturing an SZ slot type optical fiber cable of the present invention.

FIG. 2 is a plan view showing a storage die of the manufacturing apparatus shown in FIG.

FIG. 3A is a plan view showing a first core position adjusting rotary plate of the manufacturing apparatus shown in FIG. 1; (B) It is a top view which shows the positioning member of the 1st core wire position adjustment rotary plate shown to (A).

FIG. 4 is a plan view showing a second core line position adjusting rotary plate of the manufacturing apparatus shown in FIG. 1;

FIG. 5 is a plan view showing a slot phase detection plate of the manufacturing apparatus shown in FIG. 1;

FIG. 6 is an explanatory diagram showing a positional relationship between a slot of an SZ slot type optical fiber cable and an optical fiber core housed in a slot groove of the slot.

7 is a graph showing a change in a position of an intersection of a surface along a second core line position adjusting rotary plate of the manufacturing apparatus shown in FIG. 1 and a tangential extension of a slot groove.

8 is a graph showing the relationship between the twist angle of the slot groove at the core wire accommodating position up to the other inversion portion and the twist angle of the intersection shown in FIG. 7 based on the twist angle of the slot groove in one inversion portion. It is a graph showing.

9 is a cross-sectional view showing a modification of the core position adjusting rotary plate of the manufacturing apparatus shown in FIG.

FIG. 10 is a sectional view showing an example of a self-supporting type optical fiber cable using an SZ slot type optical fiber cable.

FIG. 11 is a plan view showing a structure of a slot of the SZ slot type optical fiber cable.

FIG. 12 is a schematic configuration diagram showing a manufacturing apparatus used to carry out an example of a conventional method for manufacturing an SZ slot type optical fiber cable.

FIG. 13 is a sectional view showing an example of a self-supporting type optical fiber cable using an SZ slot type optical fiber cable.

FIG. 14 is a model diagram showing an accommodated state of an optical fiber ribbon in the SZ slot type optical fiber cable shown in FIG.

[Explanation of symbols]

2 ··· First core position adjusting rotary plate 3 ··· Second core position adjusting rotary plate 5 and 6 ··· Positioning member 5a and 6a ··· Optical fiber core insertion hole 18 ... Slot, 21 ... Slot groove, 22 ...
・ Optical fiber ribbon (optical fiber core)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroto Watanabe 1440, Mukurosaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant (72) Inventor Suehiro Miyamoto 1440, Musaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant

Claims (2)

[Claims] 1. A method of manufacturing an SZ slot type optical fiber cable in which an optical fiber core is accommodated in a slot groove of an SZ slot by using first and second core position adjusting rotating plates. And the second core position adjusting rotary plate has an opening serving as a slot insertion part provided in the vicinity of the center, and an optical fiber core insertion hole provided on the peripheral side from the opening, and The inversion pitch of the slot groove is p, the inversion angle is γ, the layer core radius of the optical fiber core when accommodated in the slot groove is a, and the first core is positioned from the position where the optical fiber core is accommodated in the slot groove. The distance to the line position adjustment rotary plate is s,
When the distance from the position to the second core position adjusting rotary plate is l and the twist angle of the slot groove at the position is θ, the second core position adjusting rotary plate is The layer core radius of the hole is in a range from a value when θ = 0 or γ in the following (I) to a value when θ = γ / 2, and The SZ slot is inserted through the openings of the first and second core position adjusting rotary plates, and the optical fiber core is inserted through the optical fiber core insertion holes of these rotary plates.
While taking the slot and the optical fiber core, the optical fiber core is sequentially accommodated in the slot groove. In the following (II), the value when θ = 0 is α (θ = 0), and when θ = γ Is given by α (θ = γ), the second
And the twist angle α of the optical fiber insertion hole of the rotating plate is α = {α (θ = γ) −α (θ = 0)} / γ · θ + α (θ
= 0). A method for manufacturing an SZ slot type optical fiber cable, characterized in that the optical fiber cable is rotated so as to satisfy the relationship expressed by (Equation 2) 2. The method of manufacturing an SZ slot type optical fiber cable according to claim 1, wherein the first core position adjusting rotary plate is provided at a position closer to a peripheral edge than an opening of the rotary plate with respect to the rotary plate. It has a movable positioning member, the positioning member is provided with the optical fiber core wire insertion hole of the rotary plate, the insertion hole has a shape along the cross-sectional shape of the optical fiber tape core wire in a stacked state. A method for manufacturing an SZ slot type optical fiber cable, characterized by using the above-mentioned one.