JP3054568B2 - Optical fiber core guide for twisting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for eliminating the entanglement of a plurality of optical fibers when inserting a plurality of optical fibers into each storage groove of an SZ spacer and causing micro-bending after the insertion into the storage groove. The present invention relates to a twisted optical fiber core guide.

[0002]

2. Description of the Related Art An optical fiber has a remarkable difference in physical or mechanical characteristics as compared with a conventional copper conductor. , To improve the ease of handling. However, in the case of a cable, when a large external force such as lateral pressure is applied to the optical fiber core, a slight bending (microbending) occurs in the optical fiber, and the transmission loss increases. There is a need. Considering this point, there is a spacer type as a structure of the optical fiber cable. This spacer type optical fiber cable has a structure aiming at improvement of the mechanical properties of the cable, particularly high reliability against lateral pressure. In addition, the optical fiber is manufactured by being drawn from an electric furnace and spun in an optical fiber drawing apparatus, but in this state, the surface is easily scratched and the mechanical strength is weak, so that the spinning is performed at the same time as the spinning. It is formed by being covered with a curable resin or the like. The optical fiber is covered with an acrylate resin such as an acrylate, an acrylate or an acrylate resin to form an optical fiber.

[0003] The optical fiber cable thus configured is:
In the case of an SZ spacer in which the groove direction of the grooved spacer is reversed at regular intervals, the method is disclosed in Japanese Utility Model Laid-Open No. 2-45506. Have been. That is, the actual open square 2-455
No. 06, as shown in FIG. 4, an SZ spacer 2 having a spiral-shaped storage groove 1 formed on the outer periphery of which a spiral direction is reversed after being rotated by 360 degrees at a predetermined interval is a cylindrical fixed plate 3. 4 is inserted into a spacer passage 8 provided at a central portion of a rotatable plate 7 rotatably held by a holding frame 6 via a bearing 5 through a spacer passage 4 provided at a central portion thereof, and an arrow shown in FIG. Drive in the direction of A. The SZ spacer 2 includes two optical fiber core wires 10 supplied from a fixed supply bobbin 9 and two optical fiber core paths 11 of the fixed board 3 and two optical fiber cores of the rotary board 7. The optical fiber is supplied from an optical fiber insertion portion 13 that passes through the optical path 12 and is connected to the optical fiber path 12. Then, when the SZ spacer 2 travels and the rotatable board 7 rotates along the direction in which the storage groove 1 is formed, the optical fiber core wire 10 becomes an optical fiber disposed between the fixed board 3 and the rotatable board 7. The optical fiber is inserted into the storage groove 1 of the SZ spacer 2 from the optical fiber insertion part 13 while repeating the state of being wound around the surface of the winding guide 14 and the initially opened parallel state.

[0004]

As described above, a conventional optical fiber core guide for twisting an optical fiber core as disclosed in Japanese Utility Model Laid-Open Publication No. 2-45506 is provided with an optical fiber winding guide 14 and an optical fiber core guide. An attempt is made to prevent the wire 10 from winding around the SZ spacer 2 and to prevent scratches and variations in tension of the optical fiber core wire 10.

In such a conventional twisted optical fiber core guide, when a plurality of optical fiber cores 10 are inserted into the same storage groove 1 of the SZ spacer 2, a plurality of optical fiber cores supplied from a supply bobbin 9 are provided. The optical fiber cores 10 are gathered by a plurality of optical fiber core paths 11 formed in the fixed board 3, and a plurality of optical fiber core paths 11, an optical fiber winding guide 14, and an optical fiber core path 12 are formed. May be entangled with each other. For this reason, the tension of each optical fiber core wire 10 varies, and a constant tension is not applied even to the same core wire, thereby causing microbending and deteriorating transmission characteristics.

[0006] An object of the present invention is to eliminate the entanglement between optical fibers when inserting a plurality of optical fibers into the same storage groove of the SZ spacer, and to stabilize and maintain the optical fiber tension so that the spacers can be inserted. The purpose is to reduce microbending after being inserted into the storage groove, and to prevent the transmission characteristics from becoming stable and from deteriorating.

[0007]

According to the present invention, there is provided an SZ spacer which is formed in a cylindrical shape and in which a plurality of spirally formed storage grooves on the outer peripheral surface are reversed at regular intervals. A plurality of optical fibers, which are housed in one storage groove of the SZ spacer, out of a plurality of optical fiber cores supplied from a plurality of core stands and fixed to the rear end of the cylindrical body passing therethrough. The fiber cores are grouped as a group and divided into groups corresponding to the number of storage grooves of the SZ spacers. For each group, a fixed distribution plate provided with a fiber insertion hole that runs so that the optical fiber cores run adjacent to each other is provided. A plurality of fiber insertion holes, which are rotatably provided on the outer peripheral surface near the distal end of the cylindrical body and movably at an arbitrary position of the cylindrical body, and face a position where the fiber insertion hole of the fixed branch plate is formed. Is formed and supplied from the fixed branch plate. A plurality of optical fiber cores which are separated from each other, and are separated from each other by a rotating dividing plate which travels in a parallel state with the fixed dividing plate. The plurality of optical fiber cores supplied through the plurality of fiber insertion holes are arranged at the front stage of the twisting jig for guiding and inserting the respective optical fibers into each of the storage grooves of the SZ spacer for each group. It is configured.

[0008]

According to the present invention, according to the present invention, a cylindrical shape is formed,
A plurality of spirally formed storage grooves formed on the outer peripheral surface of which a groove is formed at a predetermined interval, the SZ spacers being reversed at regular intervals. Of the plurality of optical fiber cores to be formed, a plurality of optical fiber cores housed in one storage groove of the SZ spacer are grouped into one group, and the number of storage grooves of the SZ spacer is divided into one group. A fixed dividing plate provided with a continuous fiber insertion hole through which an optical fiber runs adjacent to each other, and rotatably moves to an outer peripheral surface near a tip of the cylindrical body and moves to an arbitrary position of the cylindrical body. A plurality of fiber insertion holes are formed so as to face the formation positions of the fiber insertion holes of the fixed branch plate, and a plurality of optical fiber cores supplied from the fixed branch plate are connected to each other by one. Separate this one from the fixed branch plate And a plurality of optical fiber cores supplied through a plurality of fiber insertion holes provided in series with each other. Since a plurality of optical fiber cores are inserted into the same storage groove of the SZ spacer since each group is arranged at the preceding stage of the twisting jig for guiding and inserting into each of the storage grooves of the SZ spacer. In this case, the cords can be prevented from being entangled with each other, the cord tension can be made stable and constant, the micro-bending can be reduced after the cords are inserted into the storage grooves of the spacers, and the transmission characteristics can be stabilized and the transmission characteristics can be prevented from being deteriorated.

[0009]

Embodiments of the present invention will be described below. FIGS. 1, 2 and 3 show an embodiment of an optical fiber cable guide for twisting according to the invention as claimed in the present application. Reference numeral 20 denotes a twisting optical fiber core guide, which includes a fixed branching plate 21, a cylindrical body 22, and a rotating branching plate 23, and is arranged in front of the twisting jig 40.

The fixed dividing plate 21 is formed in a disk shape as shown in FIG.
A cylindrical body 22 communicating with the hole 24 and having the same inner diameter as the hole 24 is fixed to the outside of the hole 24. Further, a plurality of circular fiber insertion holes 25 for passing the optical fiber 10 are formed in a circular shape near the outer periphery of the fixed branch plate 21.
One optical fiber core 10 supplied from a plurality of fiber stands 26 around which the optical fiber core 10 is wound and fed out as necessary is passed. As described above, in the fixed branching plate 21, the plurality of optical fibers supplied from the plurality of fiber stands 26 by inserting the optical fiber cores 10 one by one into each of the plurality of fiber insertion holes 25. The core wires 10 can be supplied to the rotary distribution plate 23 in a state of being separated one by one.

In the present embodiment, the fiber insertion holes 25 are provided at equal intervals on the same circumference of the fixed dividing plate 21. The plurality of (for example, three) fiber insertion holes 25 are one insertion hole group 25.
A, 25B, 25C and 25D are formed, and the optical fiber core 10 traveling from this one insertion hole group is SZ
It is supplied to one of the plurality of storage grooves 1 of the spacer 2,
It is designed to be stored. Therefore, fixed branch plate 2
In 1, there are formed as many insertion holes as the number of storage grooves 1 of the SZ spacer 2. The optical fiber core wires 10 housed in the same housing groove of the SZ spacer 2 are disposed so as to pass through adjacent fiber insertion holes 25 in the same insertion hole group. The fiber insertion hole 25 of the fixed branch plate 21 is processed so that the surface of the optical fiber core 10 is not scratched. Is not formed. Although not shown, the fixed branch plate 21 is fixedly supported by a gantry and is integrated.

The cylindrical body 22 is formed in a cylindrical shape and has the same inner diameter as the hole 24 formed substantially in the center of the fixed dividing plate 21, and the SZ spacer 2 runs inside. One end (rear end) of the cylindrical body 22 has a mounting flange 2
The fixed branch plate 21 is mounted on the mounting flange 27 via bolts 28. The rotary dividing plate 23 is formed in a disc shape having a hole 32 in the center, and a ring-shaped bearing is attached to a core guide fitting 29 which is fitted and fixed to the outer peripheral surface of the cylindrical body 22, as shown in FIG. It is configured to be rotatable via the base 31 and to be able to move in the longitudinal direction of the outer peripheral surface of the cylindrical body 22, and it is possible to arbitrarily set the mounting position of the core wire guide fixture 29 to the cylindrical body 22. Thereby, the mounting position of the rotation dividing plate 23 can be set arbitrarily. In addition, the rotary branch plate 23 has fiber insertion hole groups 25A formed in the fixed branch plate 21,
25B, 25C, 25D corresponding to the optical fiber core 10
A plurality of fiber insertion holes 30 are formed on the same circumference for each group, and each fiber insertion hole group has a corresponding group of optical fiber core wires 10 supplied from the fixed branch plate 21. Is to pass through. Therefore, the insertion hole group 30A of the rotating distribution plate 23
Is a through hole group 25A of the fixed branch plate 21, a through hole group 30B of the rotary branch plate 23 is a through hole group 25B of the fixed branch plate 21, and a through hole group 30C of the rotary branch plate 23 is a fixed branch line. The insertion hole group 25C of the plate 21 and the insertion hole group 30D of the rotary distribution plate 23 are
And the optical fiber core 10 that has passed through the insertion hole group 25A of the fixed distribution plate 21 is inserted into the insertion hole group 30A of the rotation distribution plate 23.
Pass through. In addition, the insertion hole group 2 of the fixed branch plate 21
Similarly, the optical fiber core 10 that has passed through 5B, 25C, and 25D is inserted into the insertion hole groups 30B, 30
C and 30D respectively.

In the rotating distribution plate 23, a plurality of fibers supplied from the fixed distribution plate 21 are inserted by inserting the optical fiber cores 10 one by one into the plurality of fiber insertion holes 30 one by one. Optical fiber cable 1 per group
0 is separated for each one and for each group, and a plurality of optical fiber cores 10 are held between a fixed distribution plate 21 and a rotation distribution plate 23 while being kept parallel to each other. 23. Further, in this embodiment, the fiber insertion holes 30 are continuously provided at equal intervals on the same circumference of the rotating distribution plate 23.
The plurality of fiber insertion holes 30 (three in FIG. 3) correspond to the fixed branch plate 21 to form one insertion hole group 30A, 30B, 30C, 30D. The optical fiber 10 traveling from the group is supplied to one of the plurality of storage grooves 1 of the SZ spacer 2 and stored therein. Optical fiber core guide 20 for twisting thus configured
Is arranged at the previous stage of the twisting jig 40.

The twisting jig 40 accommodates the optical fiber core 10 in the spiral-shaped accommodation groove 1 in which the spiral direction is reversed after rotating 360 degrees at a predetermined interval in the longitudinal direction of the outer peripheral surface of the running SZ spacer 2. Reference numeral 41 denotes a cylindrical body formed in a cylindrical shape. The cylindrical body 41 is provided with a step portion 42 at a substantially central portion, and the step portion 42 is divided into a large-diameter portion 41A having a large outer diameter and a small-diameter portion 41B having a small outer diameter. The cylindrical body 41 is provided with a step portion 42 and is constituted by a large-diameter portion 41A and a small-diameter portion 41B having an outer peripheral diameter, so that the jig 40 for twisting the optical fiber 10 can be easily fixed by the holder 43. I can do it. The center of the axis of the twisting jig 40 is SZ
A hole 44 for passing the spacer 2 is formed, and the diameter of the SZ spacer 2 traveling in the direction indicated by the arrow B in FIG. 1 is large enough to pass smoothly and without rattling. . Around the hole 44, a plurality of mounting holes 46 for penetrating and holding a stainless steel guide pipe 45 are formed. The guide pipe 45 collects a plurality (three in the present embodiment) of the optical fiber cores 10 supplied from the fiber insertion holes 30 of the rotary distribution plate 23 and collects one of the storage grooves of the SZ spacer 2. It is for guiding into 1. The guide pipe 45 includes a tubular portion formed in a tubular shape, and a guide port portion formed in a funnel shape is provided at one end of the tubular portion so that the optical fiber 10 is smoothly inserted. I have.

As described above, since the guide pipe 45 is provided with the guide port formed in a funnel shape on the side where the optical fiber core 10 is inserted, a plurality of optical fiber cores 10 can be smoothly inserted into the guide pipe 45. can do. Therefore, the mounting hole 46 for mounting the guide pipe 45 is formed to penetrate from the end of the twisting jig 40 to the inner wall surface, and the tip of the guide pipe 45 mounted on the mounting hole 46 is shown in FIG. As described above, the SZ spacer 2 is housed in the spiral housing groove 1 formed in the longitudinal direction of the outer peripheral surface of the SZ spacer 2. For this reason, the twisting jig 40 is guided by the guide pipe 45 and rotates along with the movement of the storage groove 1 in the groove forming direction. The optical fiber core 10 supplied from the optical fiber core is twisted, and the twisting force of the optical fiber core 10 rotates the rotating distribution plate 23.

Next, the operation of this embodiment will be described.
Each of the plurality of optical fiber cores 10 supplied from the plurality of core stands 26 is supplied to each of the fiber insertion holes 25 of the fixed branch plate 21, and the three optical fibers 10 are grouped. The fiber insertion hole 25 is inserted. The optical fiber core wires 10 that have passed through the fiber insertion holes 25 are supplied to the fiber insertion holes 30 for each group of the rotating distribution plate 23 facing the fixed distribution plate 21 while maintaining a parallel state with each other,
Each of the optical fiber cores 10 passes through the fiber insertion hole 30 of the rotating distribution plate 23 one by one.

The optical fibers 10 inserted through the fiber insertion holes 30 are supplied to the respective guide pipes 45 of the twisting jig 40 as a group of three, and are assembled into one at the guide pipes 45. . The tips of the guide pipes 45 for each group supplied to the guide pipes 45 are respectively inserted into the respective storage grooves 1 of the SZ spacer 2, and the groove forming direction of the storage grooves 1 (forward / reverse at regular intervals). Jig 4 along the direction
0 rotates, and the optical fiber core 10 supplied from the rotation distribution plate 23 in accordance with the rotation of the twisting jig 40.
Is twisted, and the rotation dividing plate 23 is rotated by the twisting force of the optical fiber core wire 10. Thus, the guide pipe 45
Guides the three optical fiber cores 10 for each group into the storage groove 1 by following the movement of the storage groove 1 in the groove forming direction, so that the three optical fiber cores 10 It is stored smoothly and accurately.

[0018]

According to the present invention, a plurality of optical fiber cores are inserted into the same storage groove of the SZ spacer for each group, so that the cores are not entangled with each other and the core tension is stabilized and constant. be able to. In addition, it is possible to reduce the micro-bending after the spacer is inserted into the storage groove, and to stabilize the transmission characteristics and prevent the transmission characteristics from deteriorating.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of an optical fiber core guide for twisting according to the present invention.

FIG. 2 is a front view of the fixed branch plate shown in FIG. 1;

FIG. 3 is a front view of the rotary dividing plate shown in FIG. 1;

FIG. 4 is an overall configuration diagram showing a conventional guiding device for housing an optical fiber in a housing groove of a spacer.

[Explanation of symbols]

1 …………………… Storage groove 2 …………………… SZ spacer 10 ……………………………… …………………………………………………………………………………………………………………………………… fixed parts Wire plate 22 ……………………………………………………………………………………………… Rotating split plate 24 …………………. ... Hole 25 ... Fiber insertion hole 25A, 25B, 25C, 25D ... Insertion hole group 26 ............... ……………………………………………………………… Mounting flange 28 ……………………………………… Bolt 29 …………… ………… ············································ ... Fiber insertion holes 30A, 30B, 30C, 30D ... insertion hole group 31 ... bearing ... 32 ... bearings ... ………… Hole 40 …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………… Holder 44 ………………………… Hole 45 ……………………………………………………………………………………………………………… Mounting holes

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 6/44

Claims (1)

(57) [Claims] 1. A cylindrical body which is formed in a cylindrical shape and through which an SZ spacer in which the direction of forming a plurality of spirally formed storage grooves on the outer peripheral surface is reversed at regular intervals passes through the cylindrical shape. One of the plurality of optical fiber cores fixed to the rear end of the body and supplied from a plurality of core stands, one of the SZ spacers.
A plurality of optical fiber cores housed in one storage groove are grouped as a group and divided into groups corresponding to the number of storage grooves of the SZ spacer, and a fiber insertion hole that passes through each group so that the optical fiber cores are adjacent to each other. And a rotatable movable surface on the outer peripheral surface near the distal end of the cylindrical body, and a position where a fiber insertion hole of the fixed linear plate is formed. A plurality of fiber insertion holes are formed in opposition to each other, and a plurality of optical fiber cores supplied from the fixed branch plate are separated one by one and are parallel to the fixed branch plate. And a plurality of optical fiber cores supplied through a plurality of fiber insertion holes provided in series with each other. Guided to each storage groove of SZ spacer Optical fiber guide twisting formed by arranging in front of the jig twisted to enter.