JP2007121878A - Connecting tool for optical connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting tool that materializes improved workability and highly reliable connection condition, in both a coated optical fiber connector and a jacket clamping connector with a built-in mechanical splice. <P>SOLUTION: The connecting tool 1 is provided with a coated optical fiber connector splicer 12 and a jacket clamping connector splicer 13 installed on a substrate 11. The coated optical fiber connector splicer 12 includes a guide member 121 which positions a coated optical fiber connector and a coated optical fiber holder guide rail 122 which movably supports a first coated optical fiber holder to be described later, only in the longitudinal direction D of the coated optical fiber on a connecting operation. Also, the guide rail 122 has a forward movement stopper 124 and a backward movement stopper 125 which specify a movable range of the coated optical fiber holder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a connection tool for an optical connector with a built-in mechanical splice.

  2. Description of the Related Art In recent years, an on-site optical connector incorporating an optical fiber has been used for laying an optical fiber network such as FTTH (Fiber to the Home). For example, as described in Patent Literature 1, these connectors are so-called mechanical splices (in the state in which the end faces of the optical fiber strands from which the coating has been removed are in contact with each other without being fused or bonded. Built-in mechanism to connect. Polishing the connector end face on-site by inserting a fiber that has undergone pretreatment such as optical fiber coating removal, cleaning, and cutting at the construction site into the connector and connecting with a mechanical splice built into the connector. Therefore, the connector can be attached to the optical fiber in a short time.

  In general, in a connector for a core wire incorporating a mechanical splice, the tips of two optical fibers processed on site are abutted against each other. At this time, in order to ensure a reliable butted state, the optical fiber is biased toward the connector so that the optical fiber bends somewhat within the connector. Using the reaction force due to this bending, the butting of the tips of the two optical fibers is maintained. For example, Patent Literature 2 discloses a connection jig that is intended for simple connection to an optical fiber inside a mechanical splice of a connector for a core wire.

  In addition, a fiber with a built-in mechanical splice (so-called outer-grip connector) corresponding to a cable having a structure called a lead-in cable (so-called drop cable) has been developed and is actually used. Also in the jacket-type connector, the optical fiber is urged toward the connector in order to abut the stub fiber and the tip of the optical fiber processed in the field.

JP-A-10-206688 JP 2003-322762 A

  When the connection jig described in Patent Document 2 is used, the operator holds the optical fiber core wire at an arbitrary position and inserts it into the connector, so that the amount of bending of the fiber is not constant. This means that the butting force acting on the tip of the fiber is not constant between the connection operations, and may cause a large variation in the connection characteristics of the connector. Further, it cannot be determined from the amount of bending whether the fiber has been inserted normally.

  On the other hand, with respect to the jacket-type connector, a connection tool has been developed that aligns and fixes the fiber by closing the mechanical splice element while maintaining the butted state of the stub fiber and the tip of the optical fiber processed in the field. ing. In this case, since the processing length of the fiber is constant, the amount of bending is also constant between operations. Therefore, it is possible to determine whether or not the fiber is inserted properly by checking the amount of bending. However, the operator needs to perform the operation of closing the element with the other hand while pressing the cable with one hand and holding the bending amount, so that both hands are blocked and the workability is poor.

  In addition, in the above-described connector for the core wire, a connection tool that can connect two fibers in the same or similar procedure as that of the connector for gripping the outer shell is required from the viewpoint of stability of connector characteristics and ease of work.

  Then, an object of this invention is to provide the connection tool which implement | achieves a favorable workability | operativity and a highly reliable connection state in both the connector for core wires which incorporates a mechanical splice, and the connector for a jacket.

  In order to achieve the above object, the invention according to claim 1 is a connection tool for connecting an optical fiber made of a core wire having a diameter of 0.25 mm or 0.5 mm to an optical connector incorporating a mechanical splice. The base member that holds the core wire, and is attached to the front end portion of the base member, and is movable by a predetermined length relative to the base member in the longitudinal direction of the core wire held by the base member. A core wire holding means having a head member configured as described above, positioning means for arranging the optical connector and the core wire holding means so that their longitudinal directions coincide with each other, and the core wire holding means, The core wire is moved in the longitudinal direction of the core wire held by the core wire holding means, and the leading end of the core wire is inserted into the mechanical splice and a predetermined amount of bending is generated in the core wire. It has a bending generating means, a bending holding means for holding the core wire holding means in a state where the core wire has the predetermined amount of bending, and a connecting means for closing the mechanical splice. Provide connecting tools.

  According to a second aspect of the present invention, in the connecting tool according to the first aspect, the bending holding means fixes the position of the core holding means in a state where the core wire has the predetermined amount of bending. A connecting tool having a stopper is provided.

  According to a third aspect of the present invention, in the connecting tool according to the second aspect, the base member of the core wire holding means is positioned at a relative position where the entire length of the core wire holding means is longest. There is provided a connecting tool having a tongue at the front end of the base member, which at one time forms the same plane as the front end of the head member.

  According to a fourth aspect of the present invention, in the connecting tool according to the third aspect, the optical fiber is a core wire having a diameter of 0.5 mm, and the core wire holding means protrudes from the front end surface of the head member. A connecting tool is provided having a protrusion with a groove for receiving a core wire for a specified length.

  The invention according to claim 5 is a connection tool for connecting an optical fiber comprising a cable with a sheath containing a core wire having a diameter of 0.25 mm or 0.5 mm to an optical connector incorporating a mechanical splice. Positioning means for arranging the optical connector and the cable so that their longitudinal directions coincide with each other, and moving the cable in the longitudinal direction of the cable to expose the exposed core of the cable. And a cable generating means for inserting a predetermined amount of bending into the core wire and holding the cable in a state where the core wire has the predetermined amount of bending. The cable holding means, the connecting means for closing the mechanical splice, the cable holding by the cable holding means being released, and the cable Providing a connection tool and having a fixed releasing means for moving only in the longitudinal direction of the cable.

  According to a sixth aspect of the present invention, in the connecting tool according to the fifth aspect, the bending holding means is a gripping tool for gripping the cable, and the fixing release means holds the gripping tool in a pushed-open state. A connecting tool configured to release the grip of the cable by the gripper.

  According to the connection tool of the present invention, it is possible to quantitatively and easily cause the desired fiber bending at the time of optical fiber connection using a mechanical splice, and hence it is possible to reliably connect the mechanical splice. Further, since the fiber can be held in a bent state, the operator does not block both hands, and the workability is improved.

Hereinafter, the present invention will be described in detail with reference to the drawings.
1A and 1B are top views of the connection tool 1 of the optical connector according to the present invention. In the present specification, the term “optical connector” is used as a general term for the connector for the core wire and the connector for holding the jacket to which the optical fiber is connected in the present invention. The optical fiber that can be connected to the optical connector by the connecting tool 1 includes a core wire 2A having a diameter of 0.25 mm and a jacketed cable (so-called drop cable) incorporating the core wire shown in FIG. It is a cable 2B with a diameter of 0.5 mm shown in (b) and a jacketed cable that encloses the cable core. The core 2A has a quartz glass 21A having a diameter of 0.125 mm and a UV coating 22A, and the core 2B has a further UV coating 23B outside the coating 22B in addition to the quartz glass 21B and the UV coating 22B having a diameter of 0.125 mm. Has a structure. Although the core wire 2B is more advantageous in terms of strength and handling, an operation of removing only the covering 23B is required in the connection method described later.

  3 and 4 show a connector 3 for a core wire for connecting the core wire 2A or 2B and a connector 4 for holding a jacket for connecting a drop cable containing the core wire 2A or 2B, respectively. The core wire connector 3 incorporates a mechanical splice (not shown) and is configured to connect the end faces of the stub fiber and the core wire in the mechanical splice by pushing the operating member 31. Typical mechanical splices are described in Japanese Patent Application Nos. 2004-210251 and 2004-210357 by the same applicant as the present application. The connected core wire is guided by the end cap 32. The outer gripping connector 4 is the same as the connector 3 for the core wire in that it has a similar mechanical splice and has an operation member 41 similar to the operation member 31, but the configuration of the end cap 42 is for the core wire. Different from the end cap 32. That is, the end cap 42 has a receiving hole 421 for receiving a grip member (described later) that grips the drop cable, and the grip member and the end cap 42 are fixed by the fixing member 43. 3 and 4 both show male connectors, and the corresponding female connectors can be connected to the optical fiber by the connecting tool 1 according to the present invention. The description of the female connector is omitted here.

  As shown in FIG. 1A, the connection tool 1 includes a core wire connector connection portion 12 and a jacket holding connector connection portion 13 provided on a substrate 11. The core wire connector connecting portion 12 includes a guide member 121 for positioning the above-described core wire connector 3 and a core that movably supports a first core wire holder (to be described later) during connection work only in the longitudinal direction D of the core wire. Line holder guide rail 122. By means of the guide member 121, the core wire connector 3 is accurately positioned at the connector placement portion 123 indicated by the dotted line. Further, the guide rail 122 has a forward stopper 124 and a backward stopper 125 that define the movable range of the core holder. The retreat stopper 125 is configured to be movable in a vertical direction (a direction perpendicular to the paper surface in FIG. 1A) by a spring (not shown) disposed below itself, and no core holder is placed on the guide rail 122. When free, it protrudes from the guide rail 122.

  On the other hand, the outer gripping connector connecting portion 13 includes a guide member 131 similar to the guide member 121 of the core wire connector connecting portion 12 for positioning the outer gripping connector 4 described above, and a drop cable during connection work. And a cable gripping tool 132 for fixing the cable. By the guide member 131, the jacket gripping connector 4 is accurately positioned at the connector placement portion 133 indicated by the dotted line. Further, in the vicinity of the gripping tool 132, a fixing release member 134 for releasing the fixation of the drop cable, that is, gripping by the gripping tool 132 and guiding the drop cable movably only in the cable longitudinal direction D is provided. A gripping member guide 135 for guiding the gripping member that grips the drop cable is provided between the connector arrangement portion 133 and the cable gripping tool 132. Furthermore, the connector connector 13 for gripping the jacket has a fixing member pressing lever 136 for pressing the fixing member 43 described above into the connector 4.

  As shown in FIGS. 1A and 1B, the connection tool 1 has a connection lever 15 pivotally attached to the substrate 11 by a hinge 14. The connection lever 15 has two protrusions 151 and 152, which are arranged when the connection lever is rotated with respect to the substrate 11 and moved to the position indicated by the dotted line during the fiber connection operation. The operation member 31 or 41 of the connector 3 or 4 arranged in the connector is pushed, so that the optical fiber is connected by a mechanical splice built in each connector.

  Next, the configuration of the core wire holder will be described. The core wire holder is used to connect a core fiber having a diameter of 0.25 mm or 0.5 mm without an outer cover to the optical connector. In the present invention, since the core holder is selectively used depending on the diameter, the core holder 5 for a diameter of 0.25 mm will be described first.

  FIG. 5A is a perspective view of the first core wire holder 5 used on the guide rail 122 of the connection tool 1. As shown in the drawing, the first core wire holder 5 includes a base member 51 provided with a linear groove 511 over the entire length, a cover member 53 pivotally attached to a rear portion 512 of the base member 51 by a hinge 52, The head member 54 is configured to be fitted to the front portion 513 of the base member 51 formed in a rectangular parallelepiped and to be relatively movable with respect to the front portion 513 by a predetermined length in the longitudinal direction of the groove 511. Long holes 541 are provided on both side surfaces of the head member 54 (only one side is shown in the figure), and a screw or pin 55 that can be inserted into the long hole 541 is attached to the front portion 513 of the head member 54. With such a configuration, the relative movement distance of the head member 54 with respect to the front portion 513 is defined. 5B, a spring 56 is disposed between the front portion 513 and the head member 54, and the spring 56 is in a state where the front portion 513 and the head member 54 are farthest from each other (that is, a holder). The head member 54 is biased so that the overall length as a whole becomes the longest).

  As shown in FIG. 6 showing only the base member 51, the base member 51 has a tongue portion 514 that protrudes from the front portion 513 in the longitudinal direction of the groove 511. The tongue 514 is determined so that the front end surface 515 of the tongue forms the same surface as the front end surface 542 of the head member 54 when the entire length of the holder 5 is the longest (FIG. 5A). . The advantages of this configuration will be described later.

  As shown in FIG. 7, the cover member 53 rotates around the hinge 52 after the core wire 2A having a diameter of 0.25 mm is arranged in the groove 511, thereby closing the upper portion of the groove 511 so that the core wire 2A is It is prevented that the groove 511 is unexpectedly detached. Further, as shown in FIGS. 5A and 5B, a permanent magnet 57 is provided on the rear portion 512 of the base member 51, and the cover member 53 is made of a material attracted by the magnet, thereby covering the state shown in FIG. It is reliably prevented that the core flutters and the core wire comes out of the groove 511. Further, a material 58 with a high coefficient of friction such as abrasive paper or rubber is affixed on the surface of the rear portion 512 that contacts the core wire 2A and on the surface of the cover member 53 that faces the surface in the state of FIG. Accordingly, the core wire 2A is prevented from moving in the longitudinal direction of the groove 511 in the state of FIG.

  FIG. 8 is a perspective view of the second core wire holder 6 used for the core wire 2B having a diameter of 0.5 mm. The second core wire holder 6 is different from the first core wire holder 5 in that a grooved projection 643 is provided on the front end surface 642 of the head member 64, and the rest is the same as the first core wire holder. Since it is good, explanation is omitted. The operation of the protrusion 643 will be described later.

  Next, a method for connecting an optical fiber to an optical connector using the connection tool 1 will be described. As described above, the connection tool 1 can handle both the core wire connector 3 and the jacket gripping connector 4. First, the connection of the drop cable to the jacket gripping connector 4 will be described.

  Before using the connection tool 1, the drop cable is pretreated. First, as shown in FIG. 9A, a part of the outer sheath 21C of the drop cable 2C in which the core 2A or 2B (2A in the illustrated example) is covered with the cover 21C is removed, and the core 2A having a diameter of 0.25 mm is removed. To expose. When the core included in the cable 2C is 2B having a diameter of 0.5 mm, the outer sheath 23B of the core 2B (FIG. 2B) is used by using an appropriate tool such as a fiber nipper manufactured by NTT-AT. ) Only) is removed so that the diameter of the exposed core wire is 0.25 mm. Next, as shown in FIG. 9B, the gripping member 44 is attached to the end of the remaining coating 21C. The gripping member 44 has a claw (not shown) that securely grips the coating 21C.

  Next, as shown in FIG. 9C, the covering 22A (or 22B) of the exposed core 2A (or the core 2B from which the covering 23B has been removed) is removed, and the glass 21A (or 21B) is exposed. At this time, the length X of the coating 22A (or 22B) having a diameter of 0.25 mm needs to be accurately defined. For example, a tool for this purpose is sold by Furukawa Electric Co., Ltd. under the product name “FA connector folder”. A processing holder (not shown) can be used. The drop cable can be gripped by this pretreatment holder, and the coating can be removed with a coating removal tool for a diameter of 0.25 mm. As this coating removal tool, a mechanical stripper (not shown) for FA connectors manufactured by Furukawa Electric Co., Ltd. can be used. Finally, after cleaning the fiber, the pretreatment holder is placed on an appropriate fiber cutter, and the optical fiber (that is, the glass 21A or 21B) is cut to a specified length. As the fiber cutter, various commercially available cutters can be used. One example is FC-7 (not shown) manufactured by Sumitomo Electric Industries. Thus, the pretreatment of the drop cable 2C is completed.

  When the preprocessing of the cable is completed, connection with the connection tool 1 is performed. First, as shown in FIG. 10, the above-described outer gripping connector 4 is disposed at the arrangement portion 133 of the outer gripping connector connection portion 13. Next, the pre-processed drop cable 2 </ b> C is arranged on the outer-grip connector connector 13 so that the grip member 44 is supported by the grip member guide 135. At this time, the tip of the optical fiber passes through a slit 422 (see FIG. 4) formed on the upper surface of the end cap 42 of the optical connector 4 and is positioned in the vicinity of an insertion port of a mechanical splice (not shown) in the optical connector 4.

  When the cable 2C is gradually moved in the cable longitudinal direction from the state of FIG. 10 toward the optical connector 4, the fiber tip enters the mechanical splice and contacts the internal fiber stub. When the cable 2C is further advanced from this state, the core 2A of the cable 2C (the portion of the length X described above) is bent between the gripping member 44 and the mechanical splice insertion port (that is, the position where the slit 422 is present). Arise. This bending generates a force for maintaining a constant contact between the optical fiber tip and the fiber stub tip. Next, the cable 2C is fixed by the gripping tool 132 in this state, and the state where the core wire 2A is bent is maintained. The gripping tool 132 grips the cable 2 </ b> C by the urging force of a spring 137 (see FIG. 1B) provided in the lower part thereof. Therefore, the subsequent work can be performed with the hand away from the cable. Further, since the bending of the core wire is mechanically held, the bending is not inadvertently released or the amount of bending is not changed due to an operator's mistake.

  In a state where the cable 2C is fixed and the core wire 2A is bent, as shown in FIG. 11, the connection lever 15 of the connection tool 1 is pushed down, and the operation member 41 (see FIG. 4) of the connector 4 is pushed down. Thereby, the element of the mechanical splice is closed, and the glass 21A or 21B of the cable 2C and the fiber stub are aligned and fixed.

  As described above, the bending of the core wire 2A of the fiber 2C is necessary until the connection with the mechanical splice is completed, but it is not necessary after that, and there is a possibility of causing light attenuation such as bending loss. Then, next, as shown in FIG. 12 similar to FIG. 1B, the fixing release member 134 is pushed down to push open the gripping tool 132, and the cable fixing by the gripping tool 132 is released. In the state of FIG. 11, the cable 2C is connected to the optical connector 4 only at the fiber tip of the mechanical splice, and there is a possibility that the fiber (particularly the tip) may be damaged by a slight external force. In addition, since a cable with a jacket such as the cable 2C is generally bent, when the grip 132 is opened to release the cable, the cable is exposed and an undesired force is applied to the fiber end. It can take. Such a problem is solved by the fixing release member 134. That is, the fixing release member 134 is connected to the gripping tool 132 via the hinge, and when releasing the cable 2C, the fixing release member 134 is rotated and pushed into the gripping tool 132. The fixing release member 134 holds the gripping tool 132 in the opened state to release the fixing of the cable 2C, and cooperates with the gripping tool 132 to substantially fix the cable 2C in the cable longitudinal direction D (FIG. 1A). Guide only). In other words, the cable 2 </ b> C is not unintentionally unraveled after being released from the fixed state, and is retracted along the longitudinal direction D until the bending disappears due to the repulsive force of the bent core wire 2 </ b> A. Therefore, the bending of the core wire can be removed by a simple operation without applying an undesirable force to the fiber tip.

  When the bending of the core wire is removed, as shown in FIG. 13, the fixing member pressing lever 136 of the connection tool 1 is pushed in, and the end cap 42 and the gripping member 44 of the optical connector 4 are moved by the fixing member 43 (see FIG. 4). Fix it. Thus, the connection between the drop cable 2C and the optical connector 4 is completed.

  Next, a method for connecting the core wire connector 3 and the core wire 2A or 2B will be described. First, the case of the core wire 2A having a diameter of 0.25 mm will be described. First, as shown in FIG. 7, the core wire 2A is held by the first core wire holder 5 described above. That is, the cover member 53 of the core wire holder 5 is opened, the core wire 2A is placed on the base member 51 so as to protrude more than the length necessary for obtaining a specified fiber cutting length from the tip of the head member 54, and the cover member 53 is mounted. close.

  Next, as shown in FIG. 14A, the first pretreatment holder 7 for the core wire 2A is made to hold the first core wire holder 5 holding the core wire 2A, so that an appropriate sheath removal tool and fiber can be used. Preprocessing of the core wire 2A is performed using a cutter. The first pretreatment holder 7 includes a base portion 71 that supports the core wire holder 5 and a cover portion 72 that is pivotally attached to the base portion 71, and the base portion 71 is a base of the core wire holder 5. A base receiving recess 711, a head receiving recess 712, and a groove 713 for receiving the portion 51, the head member 54, and the core wire 2A protruding from the head member 54, respectively. Since the head receiving recess 712 has a complementary shape to the outer shape of the head member 54 and the cover portion 72 is used, the core holder 5 held by the pretreatment holder 7 can be securely attached to the pretreatment holder 7. Fixed. Further, as shown in FIG. 14B, the base member 51 has the tongue portion 514 described above, and the distal end surface 515 of the tongue portion is determined so as to form the same surface as the front end surface 542 of the head member 54. In the state of being held by the pretreatment holder 7, the front end surface 515 of the tongue portion and the front end surface 542 of the head member 54 both abut against the wall surface 712 a of the head receiving recess, thereby preventing relative movement of the head member 54 with respect to the base member 51. Is done. Therefore, the coating removal length or cutting length by the coating removal tool or the fiber cutter does not change every pretreatment, and stable pretreatment can be performed.

  Next, as shown in FIG. 15, the optical connector 3 for the core wire to which the core wire 2 </ b> A is to be connected is arranged at the arrangement portion 123 of the connector connector portion 12 for the core wire of the connection tool 1, and the first core wire holder 5 is Remove from the first pretreatment holder 7 and place on the core holder guide rail 122 of the connection tool 1. At this time, if the core wire holder 5 is disposed so that the rear portion 512 of the base member 51 of the core wire holder 5 abuts on the right end portion 122a of the guide rail 122 as shown in the drawing, the tip of the cut core wire 2A becomes light. It is located in the right place before the connector 3.

  Next, while confirming that the tip of the core wire 2A enters the fiber insertion port of the end cap 32 of the optical connector 3, the core wire holder 5 is moved toward the optical connector 3 so as to slide on the guide rail 122. . When the front end surface 542 of the head member 54 of the core wire holder 5 abuts against the advance stopper 124 of the connection tool 1, the head member 54 cannot advance further, but the base member 51 is movable with respect to the head member 54. Only the base member 51 can be pushed further. At this time, the springs 56 (see FIG. 15) disposed on the base member 51 and the head member 54 are compressed. Further, since the core wire 2A does not move in the longitudinal direction with respect to the base member 51 by the action of the polishing paper 58 (see FIG. 5) of the base member 51 described above, the core wire 2A is interlocked with the movement of the base member 51 and the connector 3 is moved. Move forward inside.

  When the core wire 2A that has entered the optical connector 3 comes into contact with the tip of a fiber stub (not shown) built in the connector 3, the space between the front end surface 542 of the head member 54 and the tip 531 of the cover member 53 is reached. The core wire 2A is bent. When the base member 51 advances to the state shown in FIG. 16, that is, the position where the base member 51 cannot advance any further), the backward stopper 125 of the guide rail 122 is lifted and abuts against the rear portion 512 of the base member 51, and the core holder 5 moves backward. prevent. Even if the hand is removed from the core holder 5 in this state, the bending of the core 2A is maintained. With the bending maintained in this way, the connection lever 15 of the connection tool 1 is closed and connection by mechanical splice is performed.

  The distance from the front end surface 542 of the head member 54 of the core wire holder 5 to the tip of the optical fiber 2A is set so that the end of the optical connector 3 (end cap) from the end surface of the stub fiber of the mechanical splice built in the optical connector 3 is used. 32) If the length of the core wire holder can be increased by more than the distance up to 32), the core wire holder 5 itself has a telescopic mechanism (that is, a base member and a head member capable of relative movement). There is no need to have. However, in order to maintain the compatibility of the fiber pretreatment tools with the existing connector, there are many cases where the above-mentioned length cannot be secured. Therefore, in the present invention, the core wire holder itself includes an expansion / contraction mechanism, so that a predetermined amount of bending can be easily generated without being influenced by the skill level of the operator.

  Further, as described above, when the core wire connector is connected using the core wire holder according to the present invention, the connection process can be made almost the same as the connection process of the jacket gripping connector. There is no need to learn different work procedures.

  Next, the case of the core wire 2B having a diameter of 0.5 mm will be described. In this case, it is necessary to remove only the coating 23B having a diameter of 0.5 mm to expose the coating 22B having a diameter of 0.25 mm. In order to easily and accurately define the exposure length, the operation shown in FIG. The second core wire holder 6 is used. The subsequent description of the connecting work of the core wire 2B will be made only for the parts different from the connecting work of the core wire 2A.

  When removing the coating 23B outside the core wire 2B, in order to define the length of the coating 23B protruding from the second core wire holder 6, the tip of the grooved protrusion 643 is used as a reference. Specifically, after pressing a suitable coating removal tool against the protrusion 643, the coating removal tool is closed and the coating removal blade of the tool is cut into the coating 23B, and the coating removal tool is moved forward while being closed. The coating 23B is removed. Therefore, after the coating 23B is removed, the coating 22B having a diameter of 0.25 mm is exposed from a position separated from the tip of the protrusion 643 by the thickness of the blade of the coating removal tool.

  In the second core wire holder 6 according to the present invention, since the protrusion 643 is integrated with the head member 64, the removal length can be accurately maintained by removing the covering 23B while fixing the head member 64 with a finger. As a configuration of the tip of the core wire holder, a structure in which only the protrusion is movable with respect to the core wire holder is possible. However, in such a structure, care must be taken not to push the protrusion when removing the coating. Although it is possible to use a coating removal tool shaped so as not to push the protrusion, it reduces the scope for tool selection. In that respect, if it is set as the present invention, the coating removal length can be made constant without selecting the type of the coating removal tool.

  The second core holder 6 holding the core 2B from which the sheath 23B has been removed is held by the second pretreatment holder 8 in the same manner as the first core holder 5 holding the core 2A ( FIG. 17). Constituent elements similar to those of the first pretreatment holder 7 included in the second pretreatment holder 8 are shown by changing the reference numerals from 7 to 8. However, the second pretreatment holder 8 further includes a groove 814 that receives the protrusion 643 of the second core wire holder 6. In the second pretreatment holder 8 as well, the tongue of the base member 81 prevents the head member 64 from moving relative to the base member 61 of the second core holder when held by the second pretreatment holder. It is possible to prevent the fiber cutting length from becoming inappropriate in a later process.

  About the operation | work after using the 2nd core wire holder 6, it can carry out similarly to the operation | work using the above-mentioned 1st core wire holder 5. FIG. However, since the second core wire holder 6 has the protrusion 643, the length of the portion of the core wire 2B having a diameter of 0.5 mm is accurately defined, and the portion of the fiber that can be bent after the fiber connection is completed has high strength. It can be limited to only a portion having a diameter of 0.5 mm.

(A) It is a top view of suitable embodiment of the connection tool of the optical connector which concerns on this invention, (b) It is a side view of (a). (A) It is sectional drawing of the core wire which can be connected with the connection tool of FIG. 1, (b) It is sectional drawing of the other core wire which can be connected with the connection tool of FIG. It is a perspective view of the optical connector for core wires. It is a perspective view of the optical connector for covering. (A) It is a perspective view of the core wire holder for core wires with a diameter of 0.25 mm, (b) It is a top view of the core wire holder of (a). It is a perspective view of the base member which the core wire holder of FIG. 5 has. It is a perspective view which shows the state which hold | maintained the core wire using the core wire holder of FIG. It is a perspective view of the core wire holder for core wires with a diameter of 0.5 mm. (A) It is a figure which shows the pre-processing process of a cable with a jacket, Comprising: It is a figure which removed the part of the jacket from the cable, (b) The holding member was attached to the edge part of the remaining jacket It is a figure which shows a state, (c) It is a figure which shows the state which removed the coating | coated from the front-end | tip of a core wire. It is a figure which shows the state which has arrange | positioned the optical connector and the pre-processed cable in the connection operation | work of the cable with a jacket using the connection tool which concerns on this invention. FIG. 11 is a diagram illustrating a state in which a fiber is connected using a connection lever following FIG. 10. FIG. 12 is a diagram illustrating a state where the cable fixing by the gripping tool is released by the fixing release member following FIG. 11. FIG. 13 is a diagram illustrating a state in which the fixing member is pushed into the optical connector following FIG. 12. (A) It is a figure which shows the state which accommodated the 1st core wire holder in the 1st pre-processing holder, (b) It is a figure which shows the bb cross section of (a). It is a figure which shows the state which has arrange | positioned the optical connector and the pre-processed core wire holder in the connection operation | work of the core wire using the connection tool which concerns on this invention. FIG. 16 is a diagram illustrating a state where the core wire holder is advanced and connection by mechanical splicing is enabled following FIG. 15. It is a figure which shows the state which accommodated the 2nd core wire holder in the 2nd pre-processing holder.

Explanation of symbols

1 Connection tool 2A, 2B Core wire 2C Drop cable 3, 4 Optical connector 5, 6 Core wire holder 7, 8 Pretreatment holder

Claims (6)

A connection tool for connecting an optical fiber comprising a core wire having a diameter of 0.25 mm or 0.5 mm to an optical connector incorporating a mechanical splice,
A base member for holding the core wire, and attached to a front end portion of the base member, and configured to be movable by a predetermined length with respect to the base member in the longitudinal direction of the core wire held by the base member A core holding means having a head member formed;
Positioning means for arranging the optical connector and the core wire holding means so that their longitudinal directions coincide with each other;
The core wire holding means is moved in the longitudinal direction of the core wire held by the core wire holding means, and the leading end of the core wire is inserted into the mechanical splice and a predetermined amount of bending is applied to the core wire. Bending generating means for generating
Bending holding means for holding the core wire holding means in a state in which the core wire has the predetermined amount of bending;
Connecting means for closing the mechanical splice;
A connection tool comprising:   The connection tool according to claim 1, wherein the bending holding means includes a stopper that fixes a position of the core wire holding means in a state where the core wire has the predetermined amount of bending.   The base member of the core wire holding means has a tongue portion that forms the same surface as the front end surface of the head member when the head member is in a relative position where the total length of the core wire holding means is longest. The connection tool according to claim 2, which is provided at the front end portion of the base member.   The optical fiber is a core wire having a diameter of 0.5 mm, and the core wire holding means includes a protrusion having a groove that accommodates the core wire protruding from the front end surface of the head member for a specified length. 3. The connection tool according to 3. A connection tool for connecting an optical fiber comprising a cable with a sheath containing a core wire having a diameter of 0.25 mm or 0.5 mm to an optical connector incorporating a mechanical splice,
Positioning means for arranging the optical connector and the cable so that their longitudinal directions coincide with each other;
Bend generation means for moving the cable in the longitudinal direction of the cable, inserting the exposed end of the cable core into the mechanical splice, and generating a predetermined amount of bend in the cable core; ,
Bending holding means for holding the cable in a state in which the core wire has the predetermined amount of bending;
Connecting means for closing the mechanical splice;
Fixing release means for releasing the holding of the cable by the bending holding means and making the cable movable only in the longitudinal direction of the cable;
A connection tool comprising:   The bending holding means is a gripping tool for gripping the cable, and the fixing release means is configured to hold the gripping tool in an open state and release the gripping of the cable by the gripping tool. Item 6. The connecting tool according to Item 5.

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