KR100322464B1 - Manufacturing method of S-Jet slot fluorescent fiber cable - Google Patents

Abstract

An object of the present invention is to provide a manufacturing method in which the opening of local torsion inherent in the SZ slot itself does not affect the insertion point of the optical fiber, and as a solution means, a spiral shape inverted alternately on the surface of the cylinder The grooved SZ slot 1 forms the torsion fixing points 3 and 10 which are held so as not to be twisted around the slot shaft, and between the torsion fixing points 3 and 10, the SZ slot ( Proceeding 1) in a straight state, a groove fixing through guide 6 having one or more protrusions protruding in the groove is formed so that the spiral groove of the SZ slot 1 does not rotate in the circumferential direction of the cross section. Is passed through the groove fixing passage guide (6), and the optical fiber (4) is inserted into the groove of the SZ slot (1) near the groove fixing passage guide (6) and immediately pressed onto the SZ slot (1). Cold (7) is performed.

Description

Manufacturing method of SZ slot type optical fiber cable

The present invention relates to a method for manufacturing an SZ slot optical cable in which an optical fiber is accommodated in the groove of an SZ slot having an alternately inverted spiral groove.

BACKGROUND OF THE INVENTION An optical fiber cable in which a helical groove is formed in a circumferential member and an optical fiber is accommodated therein is well known as a method for protecting a delicate optical fiber from various stresses and accommodating the optical fiber at a high density.

In addition, the slot in which the spiral groove direction is alternately inverted is called an S2 slot, and simply removes the desired optical fiber by simply removing the upper coating member from the middle portion without cutting the cable. It employ | adopts as an aspect, and the example is shown to FIG. 5 and FIG.

)(22)와, 폴리에틸렌 등 플라스틱으로 되어 있으며 외주면에 교호로 반전하는 나선형상의 홈(23-1)을 형성한 광파이버수용체(23)로 이루어진다. 필요에 따라서는, 중심의 항장력체를 생략하고, 중심부까지 충실한 알루미늄 등 금속으로 된 원주형상의 막대표면에 교호로 반전하는 나선형상의 홈을 형성한 것을 SZ슬롯으로서 채용하는 경우도 있다.5 is an example of an SZ slot, a tension body composed of a steel wire, a stranded wire, an FRP ship, and the like (

22, and an optical fiber receptor 23 made of plastic such as polyethylene and having a spiral groove 23-1 alternately inverted on an outer circumferential surface thereof. If necessary, the SZ slot may be employed in which a central tensioning body is omitted and a spiral groove inverted alternately is formed on a cylindrical rod surface made of metal such as aluminum that is faithful to the center portion.

In addition, although the optical fiber is accommodated in the groove, there are various forms of the optical fiber as shown in FIG. (24) Tied up a plurality of sheets coated on glass fibers and wound them with threads, tapes, etc. (25) Bulk coating on a plurality of sheets coated on glass fibers in parallel to form a tape, and laminated them in scratches And (26) are the ones in which the glass fibers are coated in a plurality of grooves, and (27) are the two insulated glass fibers and the outer coating is put in a plurality of grooves. It is thought of as a form. In FIG. 6, various types of optical fibers are accommodated in the grooves. However, in one optical fiber cable, optical fibers of the same type are often accommodated. In Fig. 6, reference numeral 28 denotes an outer covering tape, and 29 denotes an outer coating made of plastic or the like.

In manufacturing this kind of SZ slot fluorescent fiber cable, the assembly apparatus shown in Fig. 7 is usually used. In Fig. 7, reference numeral 31 denotes an SZ slot, 32 denotes an inverted spiral groove formed in the SZ slot, 33 denotes a survivobin, 34 denotes an optical fiber, and 35 and 36 alternate. An orifice, 37, which rotates around an axis while inverting into the direction, is a guide pipe for guiding an optical fiber. In the manufacturing method using this apparatus, the optical fiber 34 supplied from the supra bobbin 33 passes through the alders 36 and 35 rotating around the axis while inverting alternately, and through the guide pipe 37. It is led into a spiral groove 32 which is alternately inverted formed on the surface of the SZ slot 31. In addition, the guide pipe 37 is mounted on the alder 35 and synchronously rotates around the axis of the helical groove 32 accompanying the progression in the direction of the arrow of the SZ slot 31. ) Also rotates around the axis like the alder 35, and one end of the guide pipe 37 is located above the spiral groove or slightly recessed in the spiral groove, and the optical fiber from there is moved into the spiral groove. Induced.

In the conventional manufacturing method as described above, in the section until the spiral groove is alternately inverted, the duck wood 35 rotates in one direction, but the supra bobbin 33 does not rotate around the axis. In the optical fiber between the bobbin 33 and the duck neck 35, a portion corresponding to the rotation angle of the duck neck is wound around the shaft. Since the middle part is guided by the alder 36, when the rotation angle until the inversion is large alternately, the optical fiber does not come into contact with the SZ slot or the like in the meantime, but when the rotation angle until the inversion is large, the supply bobbin Between the 33 and the duck tree 36, or between the duck tree 36 and the duck tree 35, the optical fiber is wound around the SZ slot.

In addition, as shown in Fig. 5, the SZ slots have a tensile tension line at the center, but as a representative example of the tension tension line, a stranded wire of a steel wire or a twisted wire in which a plurality of steel wires are twisted together is used. By the way, these steel wires or strands are non-uniform at the time of manufacturing them, and local torsional torsion is inherent. When this torsion is opened when the SZ slot is extended and the SZ slot is opened even when the SZ is taken straight out and advanced, the SZ slot is rapidly rotated around the axis. In addition, it is difficult to predict when the rotation by this torsional opening will occur.

When the local twisting of the tension line causes irregular rotation of the axis of the SZ slot, the optical fiber is irregularly wound around the SZ slot, which causes the optical fiber to be traumatized, or the large stress that affects the transmission loss in the optical fiber. There is a thing to give. In order to prevent this from happening, it is also considered to work at a low speed, but it is economically unfavorable, such as a large number of facilities for producing the same amount of production.

The present invention provides a manufacturing method that overcomes the inconvenience of the prior art.

1 illustrates an embodiment of the present invention.

Figure 2 is an enlarged view of the vicinity of the guide groove passing through the embodiment of the present invention

Figure 3 is a view showing an embodiment of the home fixed passage guide

4 is a view for explaining the relationship between the helix angle of the SZ slot groove and the helix angle of pressing;

5 shows an example of an SZ slot.

6 shows an example of an SZ slot type optical fiber cable.

7 is a view of an assembly apparatus used in a conventional manufacturing method.

<Description of the symbols for the main parts of the drawings>

1: SZ Slot 2: Supply Reel

3: torsion fixing device (brake device) 4: optical fiber

5: Optical Fiber Feed Reel 6: Groove Fixed Guide

7: press to rewind 8: press to rewind feed reel

9: push-up head 10: torsion lock (take-off)

11: winding reel 12: optical fiber insertion pressing device

In the present invention, the SZ slot type optical cable manufacturing method in which an optical fiber is accommodated in the groove of the SZ slot having a spiral groove alternately inverted on the circumferential surface thereof, wherein the SZ slot is centered on a slot axis. Two or more torsional fixing devices which are kept in such a twisted manner are installed, and between the two torsional fixing devices, the SZ slots protrude into the grooves so that the grooves of the SZ slots do not rotate about an axis while advancing the SZ slots in a straight state. A groove fixing through guide having one or more protrusions formed is formed to pass the SZ slot through the groove fixing through guide, and an optical fiber is introduced into the spiral groove of the SZ slot in the vicinity of the groove fixing through guide and accommodated immediately. It is characterized by performing a press-winding made of a thread, a tape or the like on the SZ slot.

It is also possible to use, as a torsional fixing device, a brake device consisting of a plurality of wheels that adds braking force to the progression of the SZ slot, and a draw device consisting of a plurality of wheels that give a pulling force to the SZ slots containing optical fibers. Do.

Further, by setting the spacing between the groove fixing passage guide and the torsion fixing devices on both sides to 3 m or more, it is possible to sufficiently distort the torsion generated in the SZ slot by the groove fixing passage guide.

In the groove fixing through guide, one or more holes are drilled on the circumference at a position not exceeding twice the radius of the SZ slot at the center thereof, and an optical fiber is inserted through the hole to insert the optical fiber into the groove of the SZ slot. In this way, the optical fiber passing through the hole of the groove fixing passage guide can be smoothly inserted into the groove of the SZ slot.

In addition, at the insertion point where the optical fiber is inserted into the spiral groove inverted alternately of the SZ slot, a plurality of optical fibers are stacked and stacked by winding one or more circumferences of one end (spring) fixed on both ends of the SZ slot via springs. Even in the case of the shape as described above, the optical fiber can be inserted into the groove while the arrangement is maintained.

In addition, since the interval between the groove fixing pass guide and the insertion point of the optical fiber into the groove of the SZ slot is set to 1/10 or less of the SZ inversion interval, the insertion of the optical fiber into the SZ slot becomes smoother.

In addition, since the interval between the insertion point of the optical fiber and the pressing winding head is 1/3 or less of the SZ inversion interval, the optical fiber inserted once in the spiral groove of the SZ slot can be prevented from popping out of the groove.

In addition, by making the spiral angle of the press-wound by the thread, tape, etc. larger than twice the maximum spiral angle of the groove of the SZ slot, it is also possible to prevent the wound of the optical fiber inserted into the groove of the SZ slot by dropping.

EMBODIMENT OF THE INVENTION Hereinafter, specific embodiment is described by drawing. 1 is a view showing an embodiment of the manufacturing method according to the present invention, Figure 2 is an enlarged view of a portion thereof, Figure 3 shows an embodiment of the groove fixing passage guide, Figure 4 is a spiral groove of the pressing winding As a diagram illustrating the relationship between the helix angles, the same symbols indicate the same elements.

First, the overall configuration of the present invention will be described with reference to FIG. The SZ slot 1, in which the spiral grooves alternately inverted on the surface thereof, are released from the supply reel 2, and through the brake device 3, the groove fixing passage guide 6 and the optical fiber insertion pressing device 12 are formed. And through the take-up head 9, pass through the take-up device 10, and rewind to the take-up reel 11. The take-off force required for this progress is given by the take-out device 10, and the brake device 3 applies a brake force to the move, thereby maintaining the SZ slot in the straight line.

The optical fibers 4 are supplied from the optical fiber supply reels 5, respectively, and are inserted into the grooves of the SZ slot 1 at the place of the optical fiber insertion pressing device 12 through the groove fixing through guides 6.

The press-winding 7 made of thread, tape or the like is unwound from the press-winding supply reel 8 and wound spirally on the SZ slot by the press-winding head 9 rotating around the shaft.

Here, the groove fixing passage guide 6 serves to maintain the home position of the SZ slot passing there through at a predetermined position, and the protrusions formed and fixed on the groove fixing passage guide as described later are grooves of the SZ slot. Is inserted in. Since the grooves of the SZ slots are spirally inverted alternately, the positions of the grooves are fixed, so that the SZ slots on both sides of the groove fixing passage guide are twisted under torsional force. This torsional force is maximum at the spiral inversion of the groove.

If R is the radius of the SZ slot and F is the force exerted from the projection, and T is the torque applied to the SZ slot, then T = F x R. In addition, the distance between the groove fixing passage guide and the torsion fixing device of both SZ slots is set to A and B, and the torsional rigidity of the SZ slot is set to G, and the maximum inversion angle of the groove (the SZ slot is viewed in the axial direction). In this case, a half of the circumferential angle drawn by one groove is assumed to be θ, whereby T = G × (A + B) × θ / (A × B). The values R, G, and θ are integers determined by the structure of the optical fiber cable and cannot be changed when the structure is determined. As a manufacturing method, when an excessive force is applied to the groove from the projection, the groove is damaged or destroyed, so it is necessary to prevent such a situation. For that purpose, it is necessary to make F below a fixed value, and to make A and B as large as possible.

In Fig. 1, the brake device 3 or the take-out device 10 is composed of a plurality of wheels, and the torsional force applied to the SZ slot by the groove fixing passage guide is prevented from slipping the SZ slot 1 wound thereon. Each of them functions as a torsion fixing device for preventing the feed reel 2 or the take-up reel 11 from being transmitted.

Therefore, the space | interval of the brake apparatus 3 and the groove | channel fixing passage guide 6 corresponds to said A, and the space | interval of the take-out apparatus 10 and the groove | channel fixed passage guide 6 corresponds to said B.

In the case of an SZ slot having an outer diameter of 5 to 25 mm, which is generally used, the value of A or B is set to 3 m or more, respectively, so that an excessive force is not applied to the groove. In addition, the twist of the SZ slot 1 generated by the groove fixing through guide 6 is distributed in the same manner in the sections A and B, and does not damage the SZ slot. In addition, when the SZ slot is made of a weaker material than usual, or when the stiffness of the tensioning body is higher than usual, the section lengths of A and B need to be longer.

2, an enlarged view of the vicinity of the groove fixing device, or the optical fiber 4 released from the optical fiber supply reel 5 fixed to the ground, through the hole 16 drilled in the groove fixing passage guide 6, At the optical fiber insertion point X immediately before the optical fiber insertion pressing device 12, it is inserted into the groove of the SZ slot 1.

The projection 6-1 of the groove fixing passage guide 6 is inserted into the groove of the SZ slot, whereby the groove to be rotated is fixed so as not to rotate in the axial direction as the SZ slot progresses. Therefore, the SZ slot receives a reaction force from the projection, and the SZ slot itself is twisted between the groove fixing through guide and the torsion device. In addition, since the grooves formed in the SZ slots are alternately inverted in a spiral shape, this distortion is also generated alternately.

Since the groove position of the SZ slot 1 is fixed in the groove fixing passage guide, the optical fiber passing through the hole 16 of the groove fixing passage guide 6 is located in the groove of the SZ slot 1 at approximately the same place. Will be inserted. Further, in order to insert the optical fiber into the groove as close to the groove fixing through guide 6 as possible, the hole 16 should preferably be as close to the SZ slot as possible, and the radius from the axis of the SZ slot to the hole. Is less than twice the radius of the SZ slot and is preferably suppressed.

The optical fiber insertion pressing device 12 includes a fixing guide 15 and a winding string 13 in which both ends arranged in front thereof are fixed via a spring 14. The winding string 13 is a smooth string made of nylon, polyethylene, teflon, polypropylene, or the like, and wound around the SZ slot for at least one week. Therefore, the optical fiber 4 is inserted into the spiral groove at the insertion point X while part of it is rubbed by the winding string. In addition, it is preferable that the interval between the insertion point X and the groove fixing through guide is as small as possible, and it is preferable to be 1/10 or less of the SZ inversion interval (corresponding to L in FIG. 5).

In addition, the press-winding 7 made of a thread, a tape, or the like is released from the press-winding supply reel 8, and the press-winding head 9 rotates about an axis like the press-winding supply reel 8, so that SZ Spirally wound on slot. If the insertion point X of the optical fiber and the press-and-reel device are large, the inserted optical fiber may protrude from the spiral groove, so it is preferable to make it as small as possible, and 1 of the SZ inversion interval (equivalent to L in FIG. 5). It is preferable to set it to 1/4 or less if it is less than / 3, and, in the example shown in FIG. Further, even if a plurality of presses are cut by one press winding, the remaining press windings are preferable because they prevent the optical fiber from sticking out.

Fig. 3 shows an embodiment of the groove fixing passage guide, in which the groove fixing passage guide 6 is fixed to the earth, has a SZ slot through hole 17 in the center, and a hole for passing a plurality of optical fibers to the outside thereof. Has 16 Moreover, it has the projection 6-1 for fixing the groove | channel of the SZ slot which passes through, and this protrusion 6-1 protrudes into the groove 19-1 of the SZ slot 19. As shown in FIG. In addition, (19-2) is an anti-tension body of the SZ slot, and (20) is an optical fiber. In addition, since the groove fixing through guide 6 has a thickness of about 3 mm, the groove 19-1 is an SZ slot 19. Even if it is spirally formed in the longitudinal direction of (), if a small space | interval is formed between the groove | channel 19-1 and the projection 6-1, it can fully pass. In addition, although one protrusion may be sufficient, in order to inject the force applied to a groove | channel from a protrusion, it is preferable to make a plurality of protrusions, and to match with the number of flaws.

Fig. 4 is a diagram showing the relationship between the helix angle of the groove of the SZ slot and the helix angle of the pressing and winding, where (19-3) shows that the surface of the SZ slot has been cut out in the axial direction, and (19-4) is one. (7) indicates the press-wound wound on the surface of the SZ slot. The angle with respect to the axial direction of the press-winding 7 is (beta), and the maximum spiral angle with respect to the axial direction of the spiral groove | channel which alternately inverts is (alpha). Since the grooves are alternately inverted in a spiral shape, when the spiral direction of the grooves and the winding direction of the pressing wind are reversed, there is no need to worry that the pressing wind falls on the grooves, but in the same direction, α and β As it nears, the pressing wind falls into the groove, and the optical fiber in the groove is damaged. Therefore, by making β be two times or more of α, it is possible to prevent the presser 7 from falling into the grooves 19-4 even if the presser 7 is slightly loosened.

In the present invention, two or more torsional fixing devices which are held in such a manner that the SZ slots are not twisted around the slot shafts are provided, and the SZ slots are moved in a straight state between the two torsional fixing devices. The grooved through-pass guide is formed with at least one protrusion protruding from the groove so that the groove of the groove does not rotate around the axis. The SZ slot passes through the grooved through-pass guide, and the SZ slot near the grooved fixed through-guide. The optical fiber is introduced into the groove of the slot and immediately presses and winds the thread, tape, etc. on the SZ slot so that the torsion inherent in the SZ slot itself can be opened as the SZ slot proceeds. Since the groove passes through the groove fixing passage guide in a fixed position, the optical fiber inserted near the groove has no effect at all. Therefore, it is also possible to increase the production speed. In the conventional production method, the production speed was 3 to 5 m / min, which can be improved to 15 to 25 m / min by the production method of the present invention, leading to a large cost reduction. It could be said to be effective.

Claims (8)

A method of manufacturing an SZ slot optical cable in which an optical fiber is accommodated in the groove of the SZ slot having a spiral groove that is alternately inverted on the surface of the cylinder, the torsion fixing device which maintains the SZ slot without twisting about a slot axis is provided. At least two grooves are installed, and between two torsional fixing devices, the groove fixing is provided with one or more protrusions protruding into the grooves so that the grooves of the SZ slots do not rotate about the axis while the SZ slots proceed in a straight state. A pass guide is formed to pass the SZ slot through the groove fixing pass guide, and an optical fiber is introduced into the groove of the SZ slot in the vicinity of the groove fixing pass guide, and immediately press-wound formed of a thread or a tape on the SZ slot. Method for producing a SZ slot optical fiber cable, characterized in that for carrying out. The torsion fixing device on both sides of the groove fixing passage guide comprises: a brake device comprising a plurality of wheels for applying braking force to the progression of the SZ slot, and a plurality of wheels for giving a pulling force to the SZ slot containing the optical fiber. SZ slot type optical fiber cable manufacturing method characterized in that the take-out device made. The method of manufacturing an SZ slot optical fiber cable according to claim 1 or 2, wherein the distance between the groove fixing passage guide and the torsion fixing device on both sides is 3 m or more, respectively. The groove of the SZ slot according to claim 1, wherein one or a plurality of holes are formed in the groove fixing through guide on a circumference of a position not exceeding twice the radius of the SZ slot from the center thereof, and an optical fiber is inserted through the holes. A method of manufacturing an SZ slot type optical fiber cable, comprising inserting an optical fiber into the cable. 5. A method of manufacturing an SZ slot type optical fiber cable according to claim 1 or 4, wherein an interval between the groove fixing through guide and an insertion point of the optical fiber into the groove of the SZ slot is equal to or less than 1/10 of the SZ inversion interval. . 2. The SZ slot optical fiber cable according to claim 1, wherein the insertion point for inserting the optical fiber into the spiral groove inverted alternately of the SZ slot is wound around the circumference of the SZ slot with one end of the cord fixed by a spring at least one week. Manufacturing method. The method of manufacturing an SZ slot optical fiber cable according to claim 1, wherein an interval between the insertion point of the optical fiber and the pressing head is 1/3 or less of the SZ inversion interval. 2. The method of manufacturing an SZ slot optical fiber cable according to claim 1, wherein the spiral angle of pressing and winding by a thread, tape, or the like is larger than twice the maximum spiral angle of the groove of the SZ slot.

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