JP2006119160A - Joining apparatus and joining method for wire body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely join wire bodies so that they are tolerant to tension and bending and have high joining strength. <P>SOLUTION: A joining apparatus 20 comprises a joining table 41 and an ultrasonic oscillation unit 42. The joining table 41 comprises a holding part 46, guide parts 47a and 47b, and pressing members 48a and 48b. The ultrasonic oscillation unit 42 is provided with an ultrasonic oscillator 43 at the lower part. The end face 10c of an upstream side plastic primary coated optical fiber (denoted as POF thereafter) 10b is cut so as to have diagonal shape, the POF is inserted into a groove 46a of the holding part 46 and a slit 47c of the guide part 47a, and a downstream side POF 10a is arranged on the POF 10b. The ultrasonic oscillator 43 is lowered to a position at which the ultrasonic oscillator 43 is abutted on the POF 10a, and is given ultrasonic oscillation and the POFs 10a and 10b are fused and joined. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bonding method and a bonding apparatus for connecting linear bodies made of plastic.

  In recent years, plastic filaments have become more demanding for processing accuracy such as wire diameter and improvement of mechanical properties. Especially, plastic filaments for optical use (hereinafter referred to as plastic optical members) are apparatuses. Therefore, it is very important for miniaturization and high accuracy of operation and control, and it is necessary to have higher machining accuracy and good mechanical properties. Since these plastic optical members are easy to manufacture and process and are inexpensive, various applications such as optical fibers, optical lenses, and optical waveguides have recently been attempted. Among these optical members, in particular, plastic optical fiber (hereinafter referred to as POF) is made of plastic, so that it has good flexibility, light weight, good workability, and large aperture. Since it has the advantage that it can be easily manufactured as a fiber and can be manufactured at a low cost, it is rapidly spreading.

  POF is generally composed of a core made of an organic compound having a polymer as a matrix (hereinafter referred to as a core part) and an organic compound having a refractive index different from that of the core part (generally having a low refractive index). And an outer shell (cladding). In particular, a refractive index distribution type (hereinafter referred to as graded index (GI) type) POF having a core portion having a distribution in which the refractive index gradually decreases from the center toward the outside is attracting attention as an optical fiber having a high transmission capacity. Has been. As one of the methods for producing such GI-type POF, an optical base material (hereinafter referred to as a preform) is produced using interfacial gel polymerization, and then the preform is melt-heated and stretched (hereinafter referred to as drawing). Have been proposed (see, for example, Patent Document 1).

  By the way, the preform may contain minute bubbles inside during the manufacturing process. When such a preform is drawn as it is, it remains as a cavity extending in the longitudinal direction inside the obtained POF strand. This cavity causes a decrease in transmission characteristics and physical strength of the POF. For this reason, in the optical fiber drawing apparatus described in Patent Document 1, defect detection means is provided in the middle of the conveyance path from drawing from the preform to winding on the take-up bobbin to detect a defective portion of the optical fiber. Then, the bobbin exchange is started by the continuous winder, and after the defective portion is caught at the winding end of the winding bobbin, the bobbin is wound on a new winding bobbin. Thus, since the defective part is caught at the end of winding of the winding bobbin, the defective part of the optical fiber can be easily removed.

By the way, after removing a defective part as mentioned above, optical fibers may be joined (patent documents 2-4). In the joining method described in Patent Document 2, the end faces of the plastic optical fiber are melted to heat-seal the plastic optical fiber. In the joining method described in Patent Document 3, the plastic optical fibers are joined by melting or solvent bonding. Furthermore, in patent document 4, it joins by aligning the position of end surfaces by hold | maintaining an optical fiber with the V groove provided in the holding member.
JP 2000-281379 A JP 59-40614 A International Publication WO98 / 52079 JP 2002-328251 A

  In the joining method described in the above-mentioned patent document, when joining optical fibers, the end faces of each other are butted together so that the joining strength is insufficient, and a joining part reinforcing member that covers the periphery of the joining part is necessary. And When the joint reinforcing member is used, the outer diameter near the joint becomes larger than the diameter of the optical fiber. Moreover, if a joining portion reinforcing member is not used, the joining portion of the optical fiber is cut when subjected to stress due to pulling or bending in a later step. Furthermore, it is very difficult to position the end faces of the optical fibers so as to match each other, and the working efficiency is lowered. Thus, the joining method described in the above-mentioned patent document does not consider the workability after being connected by joining. And when manufacturing elongate plastic filaments other than a plastic optical fiber, the same phenomenon as the above becomes a problem.

  The present invention has been made in consideration of the above-mentioned circumstances. The wire rods are securely bonded to each other so as to be strong against pulling and bending and have high bonding strength, and the outer diameter of the bonded portion is the original wire. An object of the present invention is to provide a joining method and joining device for a wire body that can be prevented from becoming larger than the outer diameter of the wire body and can improve work efficiency.

  In order to achieve the above-mentioned object, the method for joining filaments according to the present invention is the method for joining filaments in which the ends of the first and second filaments made of plastic are welded together. The first striatum and the second striatum are overlapped and held, and the second striatum located in the vicinity of the front end surface of the first striatum is melted and the first striatum is melted. And the second striate body is welded. In addition, it is preferable to weld the first and second linear bodies after the front end surface of the first linear bodies is cut obliquely so that the thickness in the diameter direction gradually decreases.

  In addition, it is effective to provide a joining base in which slits are formed in accordance with the diameters of the first and second linear bodies, and to hold the first and second linear bodies through the slits. is there. Furthermore, it is preferable to adjust so that the difference between the wire diameter of the linear body after welding and the wire diameter before welding is within a range of −10 to + 30%. Alternatively, the welding of the striatum is performed by using ultrasonic welding means that welds the first and second striates by applying ultrasonic vibrations in contact with the second striatum. Is preferred. In addition, it is preferable that the said linear body is a plastic optical fiber.

  In the joining apparatus of the linear body of this invention, in the joining apparatus of the linear body which welds and joins the edge parts of the 1st and 2nd linear body which consist of plastics, the said 1st linear body and the said A holding means for holding the second striated body in an overlapping manner, and the first and second lines by melting the second striated body located in the vicinity of the front end surface of the first striated body. And welding means for welding the strips. In addition, it comprises a cutting means for cutting the tip surface of the first striated body obliquely so that its diametric thickness gradually decreases, and after cutting the first striated body by this cutting means, It is preferable to weld the first and second filaments.

  The holding means includes a joining base in which slits are formed according to the diameters of the first and second linear bodies, and the first and second linear bodies are inserted through the slits. It is effective to hold. Furthermore, it is preferable to have a wire diameter adjusting means for adjusting the difference between the wire diameter of the linear body after welding and the wire diameter before welding to be within a range of −10 to + 30%. Or it is preferable that the said welding means consists of an ultrasonic welding means which welds the said 1st and 2nd linear body by contact | abutting to a said 2nd linear body and giving an ultrasonic vibration.

  In the method for joining the striated bodies of the present invention, the second striated body is overlapped and held on the first striated body, and the second line located in the vicinity of the front end surface of the first striated body Since the first and second striated bodies are melted by melting the striated bodies, the striated bodies are securely joined to each other so as to be resistant to pulling and bending and to have high joint strength. It is possible to prevent the diameter from becoming larger than the outer diameter of the original wire body and improve work efficiency.

  Moreover, in the joining apparatus of the linear body of this invention, the holding means which overlaps and hold | maintains a 1st linear body and a 2nd linear body, and the 1st position located near the front end surface of a 1st linear body. Since it has welding means for fusing the two striated bodies to weld the first and second striated bodies, it is strong against pulling and bending, and it is ensured that the striated bodies have high joint strength. Thus, it is possible to provide a joining apparatus capable of preventing the outer diameter of the joint portion from becoming larger than the outer diameter of the original wire body and improving the working efficiency.

  FIG. 1 shows a rewind line for performing a rewinding process for removing a defective portion from a plastic optical fiber (hereinafter referred to as POF) strand. The rewind line 11 embodying the present invention includes a feeder 16, a cutting machine 17, a joining device 20, a marking unit 21, and a non-defective winder 22 that send out the POF strands 10 in order from the upstream side to the downstream side. It has. The rewind line 11 is provided with a controller 24 for controlling the whole.

  A POF roll 25 in which the POF strand 10 is rolled is attached to the delivery device 16, and the POF strand 10 pulled out from the POF roll 25 is sent out toward the cutting machine 17. A plurality of guide pulleys 31, dancer pulleys 32, capstan rollers 33, feed rollers 34, and nip rollers 36 are provided between the delivery machine 16 and the cutting machine 17, and guide the POF strand 10 to the cutting machine 17. . The dancer pulley 32 is provided so as to be movable up and down, and the capstan roller 33 and the feed roller 34 are rotationally driven by a motor (not shown).

  The feed roller 34 sandwiches the POF strand 10 together with the nip roller 36, and the capstan roller 33 and the feed roller 34 rotate to feed the POF strand 10 toward the downstream cutting machine 17 and the joining device 20. The capstan roller 33 is provided with an encoder 37. A signal from the encoder 37 is sent to the controller 24 as length measurement information. The controller 24 obtains length measurement data from the tip of the POF strand 10 based on the signal of the encoder 37.

  The defect information of the POF strand 10 detected in advance before the rewinding process is transferred to the controller 24, and the cutting machine 17 is operated based on this defect information to identify the defective portion of the POF strand 10. Remove. That is, when the position of the POF strand 10 measured by the signal of the encoder 37 reaches a position corresponding to the position data of the defective part, the controller 24 sends the POF strand 10 to the position of the cutting machine 17 by a predetermined amount. Then, the cutting machine 17 is operated to cut the POF strand 10. Thus, since the POF strand 10 is cut immediately before the defective portion, only the POF strand 10 excluding the defective portion is sent to the downstream side of the cutting machine 17.

  Further, a defective product winder 38 is provided between the cutting machine 17 and the feed roller 34. As described above, when the POF strand 10 is cut immediately before the defective portion by the cutting machine 17, the POF strand 10 (shown by a dotted line in the figure) including the defective portion is wound around the defective product winder 38. In this way, the POF strand 10 is guided to the defective product winder 38 by a guide roller (not shown) or by the operator's hand.

  When the defective part of the POF strand 10 passes the position of the feed roller 34 after the defective product winder 38 starts winding, the capstan roller 33 and the feed roller 34 are stopped. At this time, the POF strand 10 is guided toward the cutting machine 17 and the joining device 20 by a guide roller (not shown) or the operator's hand. When the position of the rear end of the defective part of the POF strand 10 reaches the cutting machine 17, the cutting machine 17 operates to cut the POF strand 10. As a result, the defective part of the POF strand 10 is removed, and only the defective part is taken up by the defective product winder 38.

  In addition, the cut surface of the POF strand 17 cut | disconnected with the cutting machine 17 is as shown, for example in FIG. 2 (A). Further, for the convenience of explanation, after the defective portion is removed from the POF strand 10, the downstream POF strand of the defective portion is denoted by reference numeral 10a, and the upstream POF strand of the defective portion is denoted by reference numeral 10b. . The cutting surface 10c at the tip of the upstream POF strand 10b is preferably cut obliquely with respect to the axial direction so that the thickness in the diameter direction gradually decreases. Thus, by cutting the tip cutting surface 10c obliquely with respect to the axial direction, it is possible to increase the area of the bonding surface when bonding the POF strands 10a and 10b in the bonding process described later. Become. Thereby, since positioning in the joining process becomes easy, the work efficiency can be improved and the joining strength of the POF strands 10a and 10b can be improved. Further, the cut surface of the downstream POF strand 10a is formed by cutting into a plane perpendicular to the axial direction. However, the present invention is not limited to this, and the distal end of the upstream POF strand 10b may be cut into a cut surface perpendicular to the axial direction, and a joining process described later may be performed. Furthermore, the cut surface of the downstream POF strand 10a may also be formed by cutting obliquely in the same manner as the upstream POF strand 10b.

  The POF strand 10 after the defective part is removed is fed into the bonding apparatus 20. In the joining device 20, the end of the downstream POF strand 10a and the end of the upstream POF strand 10b are joined. As shown in detail in FIGS. 3 and 4, the joining apparatus 20 includes a joining base 41 and an ultrasonic vibration unit 42. The ultrasonic vibration unit 42 is provided with a rectangular ultrasonic transducer 43 in the lower part. The ultrasonic transducer 43 is formed with a plurality of grooves 43a to 43e so as to be compatible with a plurality of types of optical fibers. In the present embodiment, the POF strand 10 is set to be joined using the groove 43a.

  The joining base 41 includes a holding portion 46, guide portions 47a and 47b, and pressing members 48a and 48b. The holding part 46 is formed in a rectangular plate shape, and grooves 46a to 46e having semicircular cross sections that are paired with the grooves 43a to 43e described above are formed on the upper surface thereof. In the present embodiment, a groove 46a paired with the groove 43a is used. The width R1 (see FIG. 6) of the grooves 43a and 46a is set to the wire diameter Rp (see FIG. 6) of the POF strand 10 to be joined in consideration of the reliable holding at the time of joining and the runnability after joining. On the other hand, it is preferable that the clearance is 0 to 40% or 0 to 200 μm. The guide portions 47a and 47b are spaced apart from each other on the upper surface of the holding portion 46 so that a gap corresponding to the dimensions of the ultrasonic transducer 43 is formed, and the guide portion 47a is located on the downstream side and the guide portion 47b is located on the upstream side. is doing. In the guide portions 47a and 47b, slits 47c and 47d having the same width are formed at positions corresponding to the holding grooves 46a of the holding portion 46. The pressing members 48 a and 48 b are made of, for example, magnets and are detachable between a pressing position attached to the upper surface of the steel holding portion 46 and a retreating position away from the holding portion 46.

  A state when the downstream POF strand 10a and the upstream POF strand 10b are joined by the joining apparatus 20 having such a configuration will be described with reference to FIGS. As described above, the upstream side POF strand 10b has its cut surface 10c cut obliquely. At this time, when the cut surface 10c of the POF strand 10b is formed so that the angle α (see FIG. 5A) with respect to the axial direction of the POF strand 10b is in the range of 10 ° to 45 °, It becomes a balanced form in terms of handling at the time of joining and improvement of joining strength. The cutting angle is not limited to this. First, as shown in FIG. 5A, the upstream POF strand 10b is inserted from the slit 47d of the guide portion 47b and held in the holding groove 46a, and the cut surface 10c of the upstream POF strand 10b. Is set below the ultrasonic transducer 43 of the ultrasonic vibration unit 42. The downstream side POF strand 10a is inserted from the slit 47c of the guide portion 47a and overlapped on the cut surface 10c of the upstream side POF strand 10b, and the cut surface 17d of the downstream side POF strand 10a is slit 47d. Set to a position that reaches At this time, the upstream POF strand 10b has its tip 10h set at a position where the distance L from the downstream edge 43f of the ultrasonic transducer 43 is 1 to 3 mm. The downstream POF strand 10a is held by the holding groove 46a and the slit 47d at a position downstream of the ultrasonic transducer 43, and at the position upstream of the ultrasonic transducer 43, the slit 47d and It is held by the POF strand 10b located on the lower surface. When the POF strands 10a and 10b are set on the holding portion 46 and the guide portions 47a and 47b, the pressing members 48a and 48b are moved and attached to the pressing position on the upper surface of the holding portion 46. As a result, the POF strands 10a and 10b are pressed from above and positioned in the holding grooves 46a and the slits 47c and 47d.

  After the POF strands 10a and 10b are set in the state shown in FIGS. 5A and 6A, the ultrasonic vibration unit 42 is moved downward to the welding position where the ultrasonic transducer 43 contacts the POF strand 10a. (The state shown in FIGS. 5B and 6B). When the ultrasonic vibration unit 42 moves to the welding position, the ultrasonic vibrator 43 vibrates at a high frequency to melt the downstream POF strand 10b. Thereby, the downstream POF strand 10a is welded to the upstream POF strand 10b and joined to one POF strand 10 (state shown in FIGS. 5C and 6C). At this time, the distal end portion of the downstream POF strand 10a becomes a surplus portion 10g that is not welded to the upstream POF strand 10b, but is melted and crushed by the ultrasonic transducer 43. Therefore, it can be easily separated from the POF strand 10 with a light force. By setting the POF strands 10a and 10b so as to leave the extra length portion 10g longer, it becomes possible to join more stably, and a high joining strength can be obtained. Further, the joining portion 10e of the POF strands 10a and 10b is formed on a circumferential surface having a diameter substantially the same as the diameter R1 of the groove 43a and the groove 46a, but is generated between the ultrasonic transducer 43 and the holding portion 46. The burrs 10f may be formed around the joint portion 10e by the gaps (the state shown in FIG. 2B).

  As shown in FIG. 4, a micro viewer 51 and a handpiece grinder 52 are disposed in the vicinity of the joining device 20. The micro viewer 51 is arranged so that the imaging optical axis direction 51a is close to the welding position of the ultrasonic transducer 43, and is connected to a monitor (not shown) via a cable. The operator can perform the joining operation of the POF strands 10a and 10b while observing the image enlarged by the micro viewer 51 on the monitor.

  As shown in detail in FIG. 3, the handpiece grinder 52 performs a grinding / polishing operation by rotationally driving a cylindrical grindstone 52a attached to the tip. In the present embodiment, it is used to remove the burr 10f formed around the joint portion 10e of the POF strand 10. As shown in FIG. 2, when the POF strands 10 a and 10 b (see FIG. 2A) from which the defective part has been removed are welded and joined by the joining device 20, the joined parts are obtained as shown in FIG. A burr 10 f is formed around 10 e so as to protrude from the outer peripheral surface of the POF strand 10. Therefore, immediately after the joining process by the joining device 20, the handpiece grinder 52 is turned on and the joining portion 10e of the POF strand 10 is pressed against the grindstone 52a that is rotationally driven to scrape the burr 10f. As a result, as shown in FIG. 2C, the burr 10 f is removed from the POF strand 10 so that the vicinity of the joint portion 10 e does not become larger than the wire diameter Rp of the POF strand 10.

  The wire diameter adjusting means for adjusting the wire diameter of the POF strand 10 is not limited to the one that performs grinding / grinding using the grinder as described above, for example, the one that performs cutting using a cutter, If the material is removed by heat, or if the extra portion that increases the wire diameter is not burred, the wire diameter may be adjusted by stretching. At this time, it is preferable to adjust the difference between the wire diameter of the POF strand 10 after bonding and the wire diameter before bonding to be within a range of −10 to + 30% or −100 to +200 μm. By adjusting the wire diameter in this way, it is possible to prevent the POF strands 10 from being scratched during winding and conveyance, and in the case of a covering step after the joining step, It is possible to prevent instability during driving.

  The POF strand 10 that has passed through the cutting machine 17 and the joining device 20 is sent to the marking unit 21. In the marking unit 21, marking is performed on the joining portion joined by the joining device 20 based on the defect information. The marking part 21 consists of an inkjet head, for example, and applies a marking by apply | coating a joining site | part. Thereby, when a subsequent process is performed, the joint portion can be easily recognized. The marked POF strand 10 is wound around the winding bobbin 60 by the winding machine 22 and sent to the next coating step.

  For example, as shown in FIG. 7, the take-up bobbin 60 includes a cylindrical body 61, a pair of flange members 62a and 62b positioned at both ends of the body 61, and the flange members 62a and 62b. It consists of bolts 63 for connecting and fixing the body part 61 in between. The body portion 61 is formed by coating polyurethane resin on the surface of a paper tube in which cardboard is formed in a cylindrical shape.

  The operation of the above configuration will be described below. When operating the rewind line 11, the POF strand roll 70 is set in the winder 61, and then the POF strand 10 is pulled out to the position of the feed roller 34 and nipped by the feed roller 34 and the nip roller 36. The encoder 37 is turned on. When the POF strand 10 is sent to the cutting machine 17 and the defective product winder 38, the defective portion is removed, and the POF strand 10 after removing the defective portion is joined to one by the joining device 20. As described above, the upstream POF strand 10b and the downstream POF strand 10a are set to overlap each other, and the downstream POF strand 10a located in the vicinity of the cut surface 10c is melted by ultrasonic vibration. The side POF strand 10a and the downstream side POF strand 10b can be joined with high joining strength, and sufficient tensile strength and bending strength can be obtained. Further, since the cut surface 10c is obliquely cut so that the diameter of the upstream POF strand 10b gradually decreases, the upstream POF strand 10b and the downstream POF strand 10a are smoothly welded. Is done. Further, since the burr 10f is removed from the POF strand 10 after bonding so that the bonding portion 10e does not protrude from the wire diameter Rp, the POF strand 10 can be prevented from being caught or cut off in the subsequent steps, and efficiently. Work can be done.

  In the above embodiment, the optical fibers before coating are bonded to each other. However, the present invention is not limited to this, and can be applied to an optical fiber after coating. In this case, first, as shown in FIG. 8A, the coating 84 on one end side (the cut surface side to be joined) of the POF cords 80a and 80b (the coating on the POF strands 10) is peeled off to form the POF. The strand 10 is exposed. For convenience of explanation, the downstream POF code of the defective part is represented by reference numeral 80a, and the upstream POF code is represented by reference numeral 80b. After a part of the coating 84 is peeled off, the POF cords 80a and 80b are joined using the joining base 81 and the ultrasonic vibrator 82 as shown in FIGS. The configuration other than the joining table and the ultrasonic transducer is the same as that of the joining apparatus of the above embodiment. The groove 82a of the ultrasonic transducer 82 is formed to have a diameter R2 that is slightly larger than the wire diameter Rp of the POF strands 10a and 10b in the POF cords 80a and 80b. The holding groove 81a of the joining base 81 has a semicircular cross section having the same diameter as that of the groove 82a of the ultrasonic transducer 82, and is formed at a position where the groove 82a is paired. In addition, a slit 83 is formed in the joining table 81 at a position corresponding to the holding groove 81a. The slit 83 is formed to have a width corresponding to the outer diameter Rc including the covering layer 84 of the POF cords 80a and 80b, and holds the POF cord 80.

  When joining the POF cords 80a and 80b with such a joining device, first, the tip 10c (see FIG. 8A) of the POF strand 10b inside the upstream POF cord 80b from which the coating has been removed is cut obliquely. Then, the cut surface 10c is disposed so as to be held in the holding groove 81a positioned below the ultrasonic transducer 82, and the POF element inside the downstream POF cord 80a from which the coating is peeled off so as to overlap the cut groove 10a. The line 10a is set (the state shown in FIGS. 9A and 10A). And the ultrasonic transducer | vibrator 82 moves below to the welding position which contact | abuts to the POF strand 10a (a state shown to FIG. 9 (B) and FIG. 10 (B)). When moved to the welding position, the ultrasonic vibrator 82 vibrates at a high frequency to melt the POF strand 10a. Thereby, the POF strand 10a is welded to the POF strand 10b, and the POF cords 80a and 80b are joined (the state shown in FIGS. 9C and 10C).

  As shown in FIG. 10C, the POF cords 80a and 80b immediately after being joined by the joining device are in a state in which burrs 10f are formed around the joining portion 10e of the POF strand 10, The burr 10f is scraped off and removed with a grinder or the like (state shown in FIG. 8B). Further, since the POF cords 80a and 80b immediately after the removal of the burrs 10f are part of the POF strands 10 including the bonding part 10e exposed, a resin 86 (for example, UV) is formed around the bonding part 10e. The step is filled with a cured resin or the like to cover the POF strand 10 (see FIG. 8C). In addition, after filling the step, the UV curable resin is irradiated with UV rays and cured. Further, the excess resin is removed by grinding with a grinder or the like so that the resin filled in the step does not become larger than the wire diameter of the POF cords 80a and 80b. In this way, the POF cords 80a and 80b are joined, and the periphery of the joining portion 10e is also covered.

  When joining the coated optical fibers in this way, a metal tape (for example, aluminum tape) or the like is attached to the surface of the joining portion 10e so that the joining portion 10e can be easily identified in the subsequent steps. It is only necessary to wrap and paste in a laver roll shape, fill the step with resin from the top, and cover it to cover the joint part. As a result, the metal tape can be detected by the metal detection means provided in the subsequent steps, and the joining site can be easily identified.

  In the above example, the optical fibers are bonded together after part of the coating is removed. However, the present invention is not limited to this. You may make it weld by giving.

It is the schematic which shows the rewinding process line of the optical fiber which implemented this invention. It is explanatory drawing which shows the joining process of an optical fiber. It is the schematic which shows the structure of the joining apparatus of an optical fiber. It is a side view of the optical fiber joining apparatus. It is sectional drawing which shows a state when joining an optical fiber with the cut surface along the axial direction of an optical fiber. It is sectional drawing which shows a state when joining an optical fiber with the cut surface along the diameter direction of an optical fiber. It is a perspective view which shows the winding bobbin for winding up an optical fiber. It is explanatory drawing which shows a joining process when joining the coated optical fiber. It is sectional drawing which shows a state when joining the coated optical fiber with the cut surface along the axial direction of an optical fiber. It is sectional drawing which shows a state when joining the coated optical fiber with the cut surface along the diameter direction of an optical fiber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10a, 10b Plastic optical fiber 11 Rewind line 20 Joining apparatus 41 Joining stand 42 Ultrasonic vibration unit 43 Ultrasonic vibrator 46 Holding part 47 Guide part

Claims (11)

In the joining method of the linear body which welds and joins the edge parts of the 1st and 2nd linear body which consist of plastics,
The first striatum and the second striatum are overlapped and held, and the second striatum located in the vicinity of the front end surface of the first striatum is melted and the first striatum is melted. A method for joining striated bodies, comprising welding the first and second striated bodies.   2. The first and second linear bodies are welded after the front end surface of the first linear body is cut obliquely so that the thickness in the diameter direction gradually decreases. The method of joining the described striatum.   A joint base having slits that match the diameters of the first and second linear bodies is provided, and the first and second linear bodies are inserted and held in the slits. A method for joining the filaments according to 1 or 2.   It adjusts so that the difference of the wire diameter of the said linear body after joining and the wire diameter before joining may be in the range of -10 to + 30%. Method of joining the striatum.   The filaments are welded using ultrasonic welding means for welding the first and second filaments by applying ultrasonic vibration in contact with the second filaments. The method for joining filamentous bodies according to any one of claims 1 to 4.   6. The method of joining linear bodies according to claim 1, wherein the linear bodies are plastic optical fibers. In the joining apparatus of the linear body which welds and joins the edge parts of the 1st and 2nd linear bodies which consist of plastics,
Holding means for holding the first striated body and the second striated body together, and melting the second striated body located in the vicinity of the front end surface of the first striated body. And a welding means for welding the first and second linear bodies.   A cutting means for obliquely cutting the distal end surface of the first striate so that its thickness in the diameter direction gradually decreases, and after cutting the first striatum by the cutting means, The apparatus for joining linear bodies according to claim 7, wherein the first and second linear bodies are welded together.   The holding means includes a joining base in which slits are formed according to the diameters of the first and second linear bodies, and the first and second linear bodies are inserted and held in the slits. The apparatus for joining filamentous bodies according to claim 7 or 8, characterized in that.   8. A wire diameter adjusting means for adjusting a difference between a wire diameter of the linear body after joining and a wire diameter before joining so as to be within a range of −10 to + 30%. The joining apparatus of the filamentous body as described in any one of 9. 8. The welding means comprises ultrasonic welding means for welding the first and second linear bodies by applying ultrasonic vibrations in contact with the second linear bodies. Thru | or any one 9 joining apparatus of a linear body.

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