JP2015025889A - Manufacturing method and manufacturing apparatus for optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus that are able to highly accurately control a twisting angle and a twisting pitch for the support wire part of a cable part, and are able to stably manufacture an optical fiber cable excellent in wind resistance characteristics.SOLUTION: A method is for manufacturing an optical fiber cable 100 formed by integrating a support wire part, a cable part provided by being reversely twisted periodically around the support wire part, and accommodating a coated optical fiber, and a connection part connecting the supporting wire and cable part. In the method, a support wire 11 is wound around the outer peripheries of two grooved pulleys more than one time, and is reversely twisted in a predetermined period integrally around the two grooved pulleys, thereby the support wire 11 is twisted and introduced into an extruder 50 together with the coated optical fiber 21; after the outer peripheries of the support wire 11 and a single-core coated optical fiber are coated with resin all at once, it is inserted into an auxiliary cooling tank to cool the resin to a semi-molten state; a cut is made in the semi-molten resin in a section positioned by a plurality of position correcting rollers; then, it is inserted into the main cooling tank to cure the resin.

Description

  The present invention relates to an optical fiber cable manufacturing method and manufacturing apparatus.

  With the spread of communication services such as the Internet, FTTH (Fiber To The Home), which connects all sections from a telecommunications carrier to a subscriber's home with optical fiber, is rapidly expanding. In such FTTH, the optical wiring network in the vicinity of the subscriber's house is generally an overhead wiring using a power pole, and the main method is to drop the wiring cable from the wiring pole to the subscriber's house using an optical drop cable. Has been adopted.

  This optical drop cable includes a cable portion that accommodates an optical fiber core wire, a support wire portion, and a connecting portion (also referred to as a neck portion) that integrally couples the cable portion and the support wire portion. The cable portion generally has a structure in which tensile strength members are arranged above and below an optical fiber core and a resin coating is provided on the outer periphery thereof. The support wire portion generally has a structure in which a resin coating is provided on a support wire made of a steel wire having a circular cross section. The connecting portion is made of a resin for integrally connecting the cable portion and the support wire portion. The resin coating of the cable part and the resin coating of the support line part and the connection part are integrally formed of the same resin, and the optical fiber core wire, the two strength members, the connection part and the support line are optical They are arranged on a substantially straight line in a cross section perpendicular to the length direction of the drop cable.

  By the way, the optical drop cable is generally aerial wired in a posture in which the support line portion is located on the upper side and the cable portion is located on the lower side. In this case, when strong wind blows from the side, the lift due to the cross-sectional shape of the optical drop cable works on the optical drop cable, and the galloping phenomenon that causes the optical drop cable to self-excited up and down and the low frequency vibration dancing phenomenon May happen. When the galloping phenomenon occurs, vibrations that cannot occur in normal strong winds continue, and problems such as cable breakage and breakage, and deterioration in transmission characteristics may occur.

  Therefore, various countermeasures have been studied to solve the above problem, and as one of them, it is considered to provide the cable portion by reversing and twisting periodically around the support wire portion. By inverting and twisting the cable part, the force due to the wind pressure of the wind received by the cable part is to be dispersed.

  In such an optical drop cable, it is important that the cable portion is accurately inverted and twisted at a predetermined angle and a predetermined pitch around the support wire portion, and the accuracy of the twist angle and twist pitch is improved. If it is low or uneven, the desired good wind resistance cannot be stably obtained. For this reason, the technique which can reversely twist and provide a cable part with a predetermined angle and a predetermined pitch around a support line part is calculated | required. However, such a technique has not yet been established for the optical fiber cable.

JP-A-8-313772 Japanese Patent Laid-Open No. 9-45160

  The present invention has been made to solve the above-described problems of the prior art, and is capable of controlling the twisting angle and twisting pitch of the cable portion with respect to the support wire portion with high accuracy, and has excellent wind resistance characteristics. An object of the present invention is to provide a method and an apparatus capable of stably manufacturing a fiber cable.

  In order to achieve the above object, a method of manufacturing an optical fiber cable according to an aspect of the present invention includes a support wire portion and an optical fiber core wire that is provided by periodically rotating and twisting around the support wire portion. A method of manufacturing an optical fiber cable in which a cable portion, a support wire portion and a connecting portion for connecting the cable portion are integrally formed, and the support wire is wound around the outer periphery of two grooved pulleys a plurality of times In addition, by twisting the two grooved pulleys integrally at a predetermined cycle, the support wire is twisted and introduced into the extruder together with the optical fiber core wire. After the resin is collectively coated on the outer periphery of the optical fiber core wire, the resin is inserted into an auxiliary cooling bath to cool the resin to a semi-molten state, and the resin in the semi-molten state is within a section positioned by a plurality of position correction rollers. Cut into Placed, then, it is characterized in that curing the resin by inserting the main cooling bath.

  An apparatus for manufacturing an optical fiber cable according to an aspect of the present invention includes a support line part, a cable part that is provided by being periodically inverted and twisted around the support line part, and stores the optical fiber core wire, An apparatus for manufacturing an optical fiber cable, in which a support line part and a connecting part for connecting the cable part are integrally formed, and has two grooved pulleys around which the support line is wound a plurality of times, A support wire twisting device configured to impart twist to the support wire by integrally rotating a plurality of grooved pulleys at a predetermined cycle, and the twisted support wire and optical fiber A core wire is introduced, and an extruder that collectively coats the outer periphery of the core, an auxiliary cooling bath that is disposed behind the extruder and cools the batch-coated resin to a semi-molten state, and the auxiliary cooling bath is provided. Coated support wire A positioning device comprising a plurality of position correcting rollers for positioning the optical fiber core wire, and the resin in a semi-molten state within the section where the coated support wire and the optical fiber core wire are positioned by the positioning device. It is characterized by comprising a slit processing device for making a cut and a main cooling tank for cooling and hardening the resin with the cut.

  According to the optical fiber cable manufacturing method and manufacturing apparatus of the present invention, the twist angle and twist pitch of the cable portion with respect to the support wire portion can be controlled with high accuracy, and an optical fiber cable excellent in wind resistance characteristics can be stably provided. Can be manufactured.

It is a cross-sectional view which shows an example of the optical fiber cable manufactured by the manufacturing method and manufacturing apparatus of the optical fiber cable of this invention. It is a figure explaining the inversion twist of the cable part in the optical fiber cable shown in FIG. It is a figure which shows schematically the structure of one Embodiment of the manufacturing apparatus of the optical fiber cable of this invention. It is a figure explaining the structure of the support wire twisting apparatus integrated in the manufacturing apparatus shown in FIG. It is a side view which shows the principal part structure of the support wire twisting apparatus shown in FIG. It is a figure which shows schematically the structure of the slit process part of the manufacturing apparatus shown in FIG. 3, (a) is a top view, (b) is a side view. It is a figure explaining the principal part shape of the slit process part shown in FIG.

  Embodiments of the present invention will be described below. Although the description will be made based on the drawings, the drawings are provided for illustration only, and the present invention is not limited to the drawings. Moreover, in the following description, the same code | symbol is attached | subjected about the component which has the same or substantially the same function and structure, and the overlapping description is abbreviate | omitted.

  First, an optical fiber cable manufactured by the optical fiber cable manufacturing method and manufacturing apparatus of the present invention will be described.

  FIG. 1 is a cross-sectional view showing an example of an optical fiber cable manufactured by an optical fiber cable manufacturing method and manufacturing apparatus of the present invention.

  This optical fiber cable 100 is an optical drop cable used for drawing and wiring from a wiring cable installed between utility poles to a subscriber's house such as a building or a general house. As shown in FIG. And the cable part 20 provided by reverse twisting around the support line part 10 and the connecting part 30 for connecting them are integrally formed.

  The support wire portion 10 includes a support wire 11 made of a steel wire (for example, a galvanized single steel wire having an outer diameter of 1.2 mm), and a coating 12 made of a resin such as flame retardant polyethylene coated on the outer periphery thereof. It is composed of The cross section of the coating 12 is formed in a circular shape having a diameter of 2 mm, for example.

  The cable part 20 is parallel to the single optical fiber core 21 with a space between the single optical fiber core 21 and above and below the single optical fiber core 21 so that their centers are located on substantially the same plane. Strength members 22 and 22 made of two steel wires, FRP (fiber reinforced plastic), and the like, and a coating 23 made of a resin such as flame retardant polyethylene that is extrusion-coated on the outside of these members are provided. Yes.

  The covering 23 is formed in a rectangular or circular cross section, and the optical fiber cable 21 is provided on the surface thereof and on the left and right surfaces of the optical fiber cable 21 so that the fiber cable 21 can be easily taken out during cable terminal processing. Grooves 24 and 24 having a U-shaped cross section, a trapezoidal cross section, or a V-shaped cross section (in the example of the drawing, a V-shaped cross section) are formed in the longitudinal direction of 100, and the bottom of the grooves 24 and 24 is the starting point. The slit-like notches 25 and 25 in a semi-fused state are provided so that the respective tips thereof are opposed to each other with the single-core optical fiber core 21 interposed therebetween. The tips of the slit-shaped notches 25, 25 reach the vicinity of the single-core optical fiber core wire 21. These slit-like notches 25 and 25 in a semi-fused state are formed by cutting a slit (slit) on the surface when the coating 23 is in a semi-molten state and cooling and curing it as it is. In such slit-like notches 25, 25, no slit is apparently observed.

  As the single-core optical fiber core wire 21, for example, an optical fiber having an outer diameter of 0.25 mm in which one or a plurality of layers of a protective coating is provided on the optical fiber with an ultraviolet curable resin or the like is used. Further, as the tensile bodies 22, 22, for example, those made of aramid FRP (aramid fiber reinforced plastic) having an outer diameter of 0.5 mm are used. The cable part 20 is formed to have a height of 2.0 mm and a width of 1.6 mm, for example.

  The connecting part 30 is formed to have a value smaller than the height and width of the support line part 10 and the cable part 20 both in height and width. For example, the height is 0.1 to 1 mm and the width is 0.15 to 0.6 mm. It is said to be about. The connecting portion is made of a resin such as flame retardant polyethylene, like the coverings 12 and 23 of the support wire portion 10 and the cable portion 20.

  In this optical fiber cable 100, the covering 12 of the support wire portion 10, the covering 23 of the cable portion 20, and the connecting portion 30 are integrally formed of the same resin. Therefore, in the optical fiber cable 100, the support wire portion 10, the cable portion 20, and the connecting portion 30 are integrally formed. The covering 12 of the support wire portion 10 made of the same resin, the covering 23 of the cable portion 20 and the connecting portion 30 are collectively referred to as a jacket. In addition, the support wire 11 of the support wire portion 10, the single-core optical fiber core wire 21 and the strength member 22 of the cable portion, and the connecting portion 30 are substantially straight in a cross section perpendicular to the length direction of the optical fiber cable 100. Is arranged.

  In the example of FIG. 1, one single optical fiber core wire 21 is accommodated in the cable portion 20, but the number of single optical fiber core wires accommodated in the cable portion 20 is one. It is not limited, and may be two or more. Moreover, it may replace with the single core optical fiber core wire 21, and an optical fiber tape core wire may be used. Further, in the example of FIG. 1, two strength members 22 are arranged across the single-core optical fiber core wire 21, but the number of strength members is one, or three or more. Also good. When one tensile strength member is disposed, it is usually disposed on the side opposite to the support wire portion 10 with the single-core optical fiber core wire 21 interposed therebetween.

  As described above, in the optical fiber cable 100, the cable portion 20 is provided by being reversely twisted around the support wire portion 10. That is, FIG. 2 is a view showing a state where the cable portion 20 is twisted while being reversed around the support wire portion 10, and FIG. 2A is a state where the cable portion 20 is in the reference position, that is, the twist angle θ A state of 0 ° is shown. The cable portion rotates counterclockwise from the state (a), and reverses to the reference position ((c) when rotated to the state (b) (twisting angle θ = 100 ° in the example of the drawing). ) State: twist angle θ = 0 °), further rotation in the clockwise direction as it is, and rotate to the state (d) (twist angle θ = −100 ° in the example of the drawing). When it reaches the state (d), it reverses and returns to the reference position again (state (e): twist angle θ = 0 °). The reverse twisting is repeated with this as one cycle, and the cable part 20 that is reversely twisted is formed around the support wire part 10.

  Thus, in the optical fiber cable 100 in which the cable portion 20 is provided by being inverted and twisted at a predetermined angle around the support wire portion 10, when the optical fiber cable 100 receives wind pressure due to wind during overhead wiring, The force due to the wind pressure can be dispersed. For this reason, it is possible to suppress the occurrence of the galloping phenomenon and the dancing phenomenon, and it is possible to prevent the breakage and breakage of the cable and the deterioration of the transmission characteristics caused by them.

  The example shown in FIG. 2 is an example in which the inversion angle of the cable portion is ± 100 °, but the inversion angle of the cable portion 20 is not particularly limited to this. The reversal angle is usually in the range of ± 65 to 115 °, and the twisting pitch is usually 500 to 2000 mm.

  Next, the manufacturing method and manufacturing apparatus of the optical fiber cable of the present invention for manufacturing the optical fiber cable 100 will be described.

  3 is a diagram schematically showing the configuration of an apparatus used for manufacturing the optical fiber cable 100, FIG. 4 is a diagram for explaining the configuration of a support wire twisting device incorporated in the manufacturing apparatus, and FIG. These are sectional drawings which show the principal part structure of the support wire twisting apparatus shown in FIG. Moreover, FIG. 6 is a figure which shows schematically the structure of the slit process part of the manufacturing apparatus shown in FIG. 3, (a) is a top view, (b) is a side view.

  As shown in FIG. 3, this manufacturing apparatus includes a support wire sending portion 42 that sends out the support wire 11, a core wire sending portion 44 that sends out the single-core optical fiber core wire 21, and a tensile strength body sending portion that sends out two strength members 22. 46 and a support wire twisting part 48 constituted by a support wire twisting device that reversely twists the support wire 11 fed from the support wire sending part 42 at a predetermined angle, and is twisted by the support wire twisting part 48. The support wire 11, the single-core optical fiber core wire 21 sent out from the core wire sending portion 44, and the tensile body 22 sent out from the strength member feeding portion 46 are gathered at predetermined positions, respectively, on the outer periphery thereof. Extruder 50 for collectively coating the resins for coatings 12 and 23, a first cooling part 52 comprising an auxiliary cooling water tank for cooling the resin to a semi-molten state, and a cut at a predetermined position of the resin in a semi-molten state Get in The slit processing part 54, the second cooling part 56 comprising a main cooling water tank for further cooling and hardening the resin, the take-up device 58 for taking up the optical fiber cable 100, and the optical fiber cable 100 taken up by the take-up apparatus 58 are wound. A take-up device 60.

  In FIG. 3, the support wire 11, the single-core optical fiber core wire 21, and the two strength members 22 are sent out from the support wire sending portion 42, the core wire sending portion 44, and the strength member sending portion 46, respectively. Of the fed support wire 11, single-core optical fiber core wire 21, and two strength members 22, the single-fiber optical fiber core wire 21 and the two strength members 22 are introduced into the extruder 50 as they are, and the support wire Reference numeral 11 denotes a support wire twisting portion 48, which is introduced into the extruder 50 while being reversely twisted at a predetermined reversal angle, for example, ± 100 °.

  The support wire twisting device constituting the support wire twisting portion 48 grips the support wire 11 and passes the gripped support wire 11 to the extruder 50 side while being reversely twisted at a predetermined angle. . For example, as shown in FIGS. 4 and 5, the support wire twisting device includes two grooved pulleys 101 and 101 having a plurality of grooves formed on the outer peripheral surface, and guide rollers 102 disposed in the vicinity thereof. 102, a drive mechanism 103 that integrally rotates the grooved pulley 101 and the guide roller 102, and a control device 104 that controls the drive of the drive mechanism 103.

  The two grooved pulleys 101 are arranged in parallel along the feeding direction of the support wire 11, and the guide roller 102 is arranged on the extruder 50 side of the two grooved pulleys 101. The support wire 11 is gripped by winding a plurality of times over the two grooved pulleys 101 around each groove provided on each outer peripheral surface of the two grooved pulleys 101, and further, the two grooved pulleys The support wire 11 is also reversely twisted by 101 being reversely twisted at a predetermined twisting angle and a predetermined twisting pitch by the drive mechanism 103 and the control device 104. The number of times of winding the support wire 11 across the two grooved pulleys 101 may be a plurality of times, and is not particularly limited, but is usually 2 to 4 times, preferably 2 times. As the grooved pulley 101, a pulley having a number of grooves corresponding to the number of windings of the support wire 11 is used. 4 and 5, reference numeral 105 denotes a gantry, 106 denotes a pulley mounting plate, 107 denotes a drive shaft, 108 denotes a driven shaft, and 109 denotes a guide roller mounting plate.

  Although not shown, the extruder 50 has a hole through which the support wire 11 twisted by the support wire twisting portion 48 is inserted, a hole through which the single-core optical fiber core wire 21 is inserted, and a tensile body. Two holes are provided through which the support wire 11, the single-core optical fiber core wire 21 and the strength member 22 are gathered at the positions shown in FIG. 1. Is done. Although not shown, the exit side of the extruder 50 is provided with a forming die provided with a hole having an outer cross-sectional shape as shown in FIG. It is derived as an optical fiber cable 100 in which the outer periphery of the wire 21 and the strength member 22 is collectively covered with the outer shape as shown in FIG. Here, the optical fiber cable 100 is in a state in which the support wire 11 is reversely twisted, and the cable portion 20 is not twisted around the support wire portion 10.

  The optical fiber cable 100 exiting the extruder 50 is inserted into an auxiliary cooling tank constituting the first cooling unit 52 placed immediately after that, and cooled until the resin is in a semi-molten state. Specifically, the resin is cooled until the surface temperature of the resin is close to the melting point of the resin (for example, in the case of polyolefin resin, usually 100 to 150 ° C., preferably 100 to 130 ° C.).

  Next, the optical fiber cable 100 is sent to the slit processing portion 54, and a slit that forms the slit-shaped notch 25 is made in the resin in a semi-molten state.

  As shown in FIG. 6, the slit processing unit 54 includes four position correction rollers (hereinafter referred to as the first position correction roller from the first cooling unit 52 side) arranged at intervals in the traveling direction of the optical fiber cable 100. 201A, a positioning device 201 including a second position correction roller 201B, a third position correction roller 201C, and a fourth position correction roller 201D) and a required portion of the coating of the optical fiber cable 100 (the optical fiber cable shown in FIG. 1) In the example of 100, it is comprised from the slit processing apparatus 202 provided with the cutting blades 202A and 202B for making the notch used as a slit-like notch in the left and right surfaces of the coating | cover 23 of the cable part 20. FIG. In FIG. 6A, the cutting blades 202A and 202B are not shown.

  In the positioning device 201, stepped rollers having a small diameter portion and a large diameter portion are used as the first to fourth position correction rollers 201A to 201D, and the directions thereof are the first and second position correction rollers 201A and 201B. And the third and fourth position correction rollers 201C and 201D are arranged so that the directions are opposite to each other. Further, the first position correction roller 201A and the second position correction roller 201B, and the third position correction roller 201C and the fourth position correction roller 201D are axially equivalent to the width or height of the optical fiber cable 100. Slightly shifted in position. By arranging the optical fiber cable 100 so as to be opposite in direction and shifted in the axial direction as described above, the outer peripheral surfaces of the small-diameter portions of the first to fourth position correcting rollers 201A to 201D are used as the first position correction. When the roller 201A and the second position correction roller 201B, the third position correction roller 201C, and the fourth position correction roller 201D are run so as to sandwich the optical fiber cable 100, the optical fiber cable 100 is shown in FIG. Thus, it travels so that it may be pressed on each position correction roller 201A-201D along the level difference part of each position correction roller 201A-201D. As a result, the optical fiber cable 100 is restrained from blurring in the vertical and horizontal directions, and at least between the first position correction roller 201A and the second position correction roller 201B, the third position correction roller 201C and the fourth position correction roller 201C. The optical fiber cable 100 is held at a predetermined position in a predetermined direction between the position correction rollers 201D. Therefore, if the cutting blades 202A and 202B are arranged between these and the optical fiber cable 100 that travels is cut into the slit-shaped notch 25, the cutting can be accurately made at a desired position. It is possible to perform slit processing with high accuracy. In this manufacturing apparatus, the cutting blades 202A and 202B are arranged on the second position correction roller 201B and the third position correction roller 201C, and on the second position correction roller 201B and the third position. A cut is made in the optical fiber cable 100 traveling on the correction roller 201C. FIG. 7 shows the optical fiber cable 100 running on the first position correction roller 201A and the second position correction roller 201B.

  In the present invention, the difference between the large diameter portion and the small diameter portion of the stepped rollers constituting the first to fourth position correction rollers 201A to 201D, that is, the step, is the optical fiber cable 100 running on the small diameter portion. It is sufficient that there is a difference that does not get over the step and move to the large diameter portion. Specifically, the step is preferably substantially the same as or larger than the cable width, and from the viewpoint of position correction, the step is more preferably substantially the same as the cable width.

  The small-diameter portion of the stepped roller may be formed in a cylindrical shape having a uniform outer diameter in the axial direction. For example, as shown in FIG. 7, the small-diameter portion is formed in a shape corresponding to the outer shape of the optical fiber cable 100. As a result, the optical fiber cable 100 can be held more stably and slit processing with higher accuracy can be performed. In the example of FIG. 7, the support wire 11 of the optical fiber cable 100, the single-core optical fiber core wire 21, and the tensile body 22 are formed in a shape that keeps the horizontal direction.

  Further, as described above, the stepped rollers constituting the first to fourth position correction rollers 201A to 201D are at least in the direction between the first and second position correction rollers 201A and 201B and the third and fourth position correction rollers. It is only necessary that the rollers 201C and 201D are disposed so as to be opposite to each other, and the second position correcting roller 201B and the third position correcting roller 201C may have the same direction or different directions. In the example shown in FIGS. 5 and 6, the stepped rollers constituting the second position correcting roller 201 </ b> B and the third position correcting roller 201 </ b> C are in the same direction, that is, the large diameter portion (or the small diameter portion) is in the same direction. It is arranged toward. Thus, by making the direction of the second position correction roller 201B and the third position correction roller 201C the same, it is possible to further stabilize the traveling of the optical fiber cable 100 and perform slit processing with higher accuracy. be able to.

  In the present invention, in place of the stepped roller, for example, a grooved roller having a guide groove having a groove width of the cable width on the outer peripheral surface can be used. Even when such a grooved roller is used as the first to fourth position correction rollers 201A to 201D, the optical fiber cable 100 can be controlled with high precision slit processing since the vertical and horizontal blurs thereof can be suppressed. Can do. However, a groove processing with high dimensional accuracy is required, and a new grooved roller needs to be prepared each time an optical fiber cable having a different cable size is manufactured. For this reason, it is preferable to use the stepped roller as described above for the position correction roller.

  The optical fiber cable 100 subjected to the slit processing is then inserted into the main cooling tank of the second cooling unit 56, and the resin that has been in a semi-molten state is further cooled and cured. In this cooling process, the cable part 20 is in a state of being inverted and twisted around the support wire part 10, and the notch put in the coating in the previous process becomes a slit-like notch in a semi-fused state, as shown in FIG. The support wire portion 10, the cable portion 20 that is provided by periodically rotating and twisting around the support wire portion 10, and the connection portion 30 that couples the support wire portion 10 and the cable portion 20 are integrally formed. An optical fiber cable 100 is obtained. The slit-like notch in the semi-fused state has a cut surface that is not completely fused and is in a semi-fused state, so that no slit is apparently observed, but the single-core optical fiber core wire 21 is taken out for connection. In some cases, it can be easily separated by hand.

  The obtained optical drop cable 100 is taken up by the take-up device 58 and taken up by the take-up device 60.

  In the present embodiment, by twisting the support wire, the cable portion is reversely twisted around the support wire portion, so the twist angle and twist pitch of the cable portion with respect to the support wire portion are highly accurate. Can be. In other words, in order to reversely twist the cable portion with respect to the support wire portion, for example, the support wire, the optical fiber core wire, and the outer periphery of the tensile body that are sent out without being twisted are collectively covered with resin, and then supported. Rotate the cable part around the part that becomes the wire part, reverse it when rotated by a predetermined angle, and repeat this to reversely twist the part that becomes the cable part around the part that becomes the support line part. It is also possible to adopt a method of rotating and then cooling. However, in this method, since the cable portion in which the coating resin is in the softened state is similarly rotated with respect to the support line portion in which the coating resin is in the softened state, the twist angle and the twist pitch are likely to vary. On the other hand, in the method of applying twist to the support line, the support line can be accurately twisted at a desired angle and pitch, so that high-precision twisting is possible.

  Moreover, in this embodiment, when twisting the support wire, the support wire is wrapped around the outer periphery of the two grooved pulleys and gripped, and the two grooved pulleys are integrally inverted and twisted. Compared with the method in which the support wire is directly gripped with a roller or the like and twisted, the support wire is not bent and the support wire is not slipped, so that the twist angle does not vary. Furthermore, since the twist angle of the support wire is stable in this way, the rotation control of the grooved pulley by the control unit is also easy.

  In the present embodiment, the slit processing is performed on the coating of the optical fiber cable in the positioned section, that is, in the section in which the vertical and horizontal blurs of the optical fiber cable are suppressed. A slit-shaped notch having a predetermined depth can be stably formed at the position.

  As mentioned above, although embodiment of this invention and its modification were demonstrated, this invention is not limited to such embodiment and its modification at all, In the range which does not deviate from the summary of invention, various omissions are carried out. Can be replaced, changed. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  DESCRIPTION OF SYMBOLS 10 ... Support line part, 11 ... Support line, 12 ... Cover | cover, 20 ... Cable part, 21 ... Single-core optical fiber core wire, 22 ... Strength member, 23 ... Cover, 30 ... Connection part, 48 ... Support wire twist part DESCRIPTION OF SYMBOLS 50 ... Extruder, 52 ... 1st cooling part, 54 ... Slit processing part, 56 ... 2nd cooling part, 101 ... Pulley with groove, 103 ... Drive mechanism, 201 ... Positioning device, 201A-201B ... 1st-1st Two-position correction roller, 202... Slit processing device, 100.

Claims (4)

A support line part, a cable part that accommodates an optical fiber core wire, which is provided by being periodically inverted and twisted around the support line part, and a connection part that couples the support line part and the cable part are integrally formed. An optical fiber cable manufacturing method comprising:
The support wire is wound around the outer periphery of the two grooved pulleys a plurality of times, and the two grooved pulleys are integrally twisted in reverse at a predetermined cycle, thereby twisting the support wire and Introduced into the extruder together with the fiber core, and after covering the outer periphery of the support wire and the optical fiber core with resin, the resin is inserted into an auxiliary cooling tank to cool the resin to a semi-molten state, and a plurality of positions are corrected. A method of manufacturing an optical fiber cable, comprising: cutting a semi-molten resin in a section positioned by a roller; and then inserting the resin into a main cooling tank to cure the resin.   2. The optical fiber cable manufacturing method according to claim 1, wherein the plurality of position correction rollers regulate movement of the optical fiber cable traveling on the position correction rollers in the horizontal direction and the vertical direction. Method.   The plurality of position correction rollers are composed of first to fourth stepped rollers arranged in order along the traveling direction of the optical fiber cable, and the direction thereof is between the first and second position correction rollers, and third 2. The method of manufacturing an optical fiber cable according to claim 1, wherein the first position correcting roller and the fourth position correcting roller are disposed in opposite directions. A support line part, a cable part that accommodates an optical fiber core wire, which is provided by being periodically inverted and twisted around the support line part, and a connection part that couples the support line part and the cable part are integrally formed. An optical fiber cable manufacturing apparatus,
It has two grooved pulleys around which the support line is wound a plurality of times on the outer periphery, and the two grooved pulleys are integrally reversely twisted at a predetermined cycle so that the support line is twisted. A support wire twisting device configured as above, a twisted support wire and an optical fiber core wire are introduced, and an outer periphery of the extruder is collectively coated with resin, and the batch coating is disposed after the extruder. A positioning device comprising an auxiliary cooling tank that cools the formed resin to a semi-molten state, a plurality of position correction rollers that position the coated support wires and optical fiber core wires that exit the auxiliary cooling tank, and the positioning In the section where the coated support wire and optical fiber core wire are positioned by the device, a slit processing device for cutting the resin in a semi-molten state, and the resin that has been cut is cooled and hardened. Apparatus for manufacturing an optical fiber cable characterized by comprising a main cooling bath for.

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