JPH02153305A - Method and tool for branching ribbon of coated optical fiber - Google Patents

Abstract

PURPOSE:To safely and surely execute branching and connecting in a hot-line state by longitudinally scoring the coating around fibers to the extent of not arriving at the fibers, then separating the fibers by each required number of fibers while tearing the coating between the fibers without using a blade. CONSTITUTION:The coating of the ribbon of coated fibers formed by arraying plural optical fibers in one row and integrally coating the fibers is first scored on the surface along the boundaries between the fibers to be branched of the ribbon of coated fibers 2 in order to branch the tape fibers in the longitudinally torn form in the hot-line state. The coating is longitudinally scored to about the extent at which the scores doe not arrive at the fibers. The fibers of the one group bordering at the formed scores and the fibers of the other group are respectively held. The held fibers of the one and the other groups are relatively moved in the direction intersecting with the plane of the ribbon of optical fiber and the holding points of the optical fibers of the respective groups are moved in the longitudinal direction of the ribbon of coated optical fibers, by which the fibers are branched.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for branching a multi-core optical fiber ribbon, and a tool used in the branching method.

[Conventional technology]

Conventionally, a plurality of optical fibers arranged in a line are connected to each other by their coatings, or are they bundled together? Optical fiber ribbons are known that are made into a single strip by &I, and when this optical fiber tape core is to be branched and connected, it is necessary to separate the required number of strands from other strands, and Removal of individual coatings is required.

[Problem to be solved by the invention 1 By the way, in the branch connection work mentioned above, separation of strands,
Alternatively, it is common to use a knife to remove the coating, but the use of such a knife does not eliminate the risk of accidentally damaging the wire, and it relies on manual labor. There is also a risk that the wire may be bent strongly during the work. Therefore, branch connection methods having such problems are unsuitable for working with optical fibers that are live, ie, transmitting signals.

That is, if a live wire is damaged by a knife or the like, it will cause an increase in transmission loss, and further, if it is significantly damaged, it may become disconnected. In addition, during the above-mentioned branch connection work, the wires may have to be bent, and if the wires are bent to an extremely small curvature, it may cause transmission loss as well as cause mechanical damage. could be.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tool and a working method that can safely and reliably perform branch connection of optical fiber tape cores in a live wire state.

[Means to solve the problem]

In order to achieve the above object, the invention described in claim 1 of the present application provides a live wire for forming a tape core wire formed into a tape shape by arranging a plurality of end fiber strands in a row and integrally covering them. In the branching method of vertically splitting the tape core wire, there are two steps: forming a scratch on the surface of the coating along the boundary between the strands of the tape core wire to be branched, and marking the formed scratch as the boundary. holding the strands of one group and the strands of the other group, respectively;
A step of relatively moving the held strands of one and the other group in a direction intersecting the plane of the optical fiber tape, and a holding point of each group of optical fibers that are relatively moved in this step is set to the length of the tape core wire. It consists of a step of moving in the direction.

The invention recited in claim 2 provides a base provided with a groove for holding a tape core wire formed into a tape shape by arranging a plurality of optical fibers in a row and integrally covering them along the bottom surface. a base, an end holding member rotatably supported by each end of the base and fixing the tape core wire to the groove at both ends in the longitudinal direction of the groove, and between these end holding members; and a central holding member rotatably supported at the end of the base, and the central holding member has a portion of the tape core in the groove that slightly protrudes from the contact surface with the base. An upper cutter that bites into the upper surface is provided, and at a position facing the upper cutter in the groove,
A lower cutter is provided that bites into the lower surface of the tape core wire in the groove.

The invention recited in claim 3 provides for the following: a tape core formed by arranging a plurality of optical fibers in a line and integrally covering them to form a tape; The shearing tool is a shearing tool for vertically splitting the strands of the tape core wire into the strands of another group, the shearing tool being based on a lower holding member having a groove for holding the strands of the group of tape core wires along the side surfaces. An upper holding member is provided on the table so as to be movable linearly in a direction intersecting the groove, and an upper holding member is provided at the end of the base and is movable between a position overlapping with the lower holding member and a position away from this position. The upper holding member is provided with a groove for holding the other group of wires protruding from the groove of the lower holding member along the side surface, and the upper holding member is provided with a groove in the groove. It is composed of a plurality of members that are divided along the length direction and are rotatable relative to the base, and the grooves of the upper and lower holding members each have a thickness approximately equal to the thickness of the tape core wire. It is composed of a narrow portion having a matching width, and wide portions provided on both sides of the narrow portion, the width of which is gradually widened.

The invention set forth in claim 4 is the invention set forth in claim 3, wherein a side surface of one of the base and the upper holding member is provided with a side surface of the other member. A guide member extending to opposing positions is provided, and the guide member is provided with a groove having a depth greater than the sum of the depths of grooves provided in the upper and lower holding members.

The invention set forth in claim 5 provides that, in the invention set forth in claim 4, between the inner surface of the guide member and the side surface of the base or the upper holding member opposing thereto, there is a The engaging means is provided with an engaging means consisting of a protrusion that can be moved in and out and a recess that fits into the protrusion.

[Effect]

According to the structure of the invention described in item 1, first, vertical scratches are made in the coating around the strands to an extent that does not reach the strands, and then, the scratches are made between the strands without using a knife. By cutting the coating, the required number of strands can be separated.

With the configuration of the invention described in item 2, the optical fiber ribbon is inserted into the groove on the base, and a part of the part to be divided is pressed by the end holding member to be held in the groove. By pressing the central holding member in this state, the cutting tools provided in the central holding member and the grooves facing the central holding member, respectively, bite into the coating of the optical fiber tape core, and in this state, the tool is pressed against the optical fiber tape core. By moving it in the length direction, it is possible to make scratches on its surface that serve as division boundaries.

With the configuration of the invention described in item 3, the optical fiber tape is inserted into the groove provided on the base, and while holding a part of the optical fiber tape with a finger, the upper holding member A predetermined number of strands of wire can be accommodated in the grooves of the upper and lower members by holding it down with one member and, while being held by this one member, with the other member. Then,
By moving the lower holding member on the base, shearing force is applied between the part held by the upper holding member and the part held by the lower holding member, and in this state, the tool By moving the optical fiber tape in the length direction of the optical fiber tape, the coating between one group of strands and one strand of another group is torn and the two are separated.

With the configuration of the invention described in item 4, the relative positional displacement of the upper holding member and the base is regulated by the guide members on the sides thereof, and the groove formed in the guide member allows the relative positional displacement of the upper holding member and the base to be It is possible to support the entire core wire that is approximately half inserted into the groove of the holding member.

With the configuration of the invention described in item 5, the upper holding member and the base can be connected to each other by fitting the projection and the recess.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 3 show a separation tool for making scratches on the coating of the tape core wire, which serve as boundaries for separating the strands.

Reference numeral 1 denotes a base, and a groove 3 into which an optical fiber ribbon 2 is inserted is formed in the base 1.

A shaft 4 parallel to the groove 3 is provided at the end of the base 1, and the groove 3 has two end holding members 5 and 5 for supporting the tape core wire 2 in the groove 3. 5 are each rotatably supported. A protrusion 6 is provided on the lower surface of these end holding members 5, and the tape core wire 2 is fixed in the groove 3 by the protrusion 6.

In addition, the magnet 7 provided near the tip allows
It is adapted to be removably fixed to the base l.

On the other hand, the center holding member 8 is similarly supported rotatably around the shaft 4, and has a cutter 9 provided therein for damaging the coating 2b covering the strands 2a of the tape core wire 2. There is. The cutter 9 is attached to the tip of a support member 1O that is held within the center holding member 8 so as to be movable in the thickness direction thereof. The support member 10 is urged upward in FIG. 3 by a spring 11 (in the direction in which the cutter 9 is retracted from the lower surface of the central holding member 8), and is further biased by a set screw 12 embedded in the central holding member 8. It resists and is pushed out to the bottom side.

On the other hand, a cutter 13 configured similarly to the cutter 9 is also provided inside the groove 3 of the base 1, and the cutter 9 has the following features:
The moving member 14 is supported by a moving member 14 held within the base 1, and the moving member 14 is further moved downward in FIG.
is pushed out into the groove 3 against the bias of the spring 15 by a set screw 16 embedded in the base 1. It should be noted that the cutters 9 and 13 are arranged at the same distance from the shaft 4 in order to inflict scratches on the same position on both sides of the tape core wire 2.

FIGS. 4 to 7 show a shearing tool that applies a shearing force to the tape core wire damaged by the separation tool to tear it apart.

Reference numeral 20 denotes a base, and the base 20 has a recess 21 formed therein. Rod-shaped guide members 22 are provided in parallel to each other in the recess 21, and a lower holding member 23 that holds the tape core wire 2 is movably supported by the guide members 22. In addition, the lower holding member 23 and the base 20
A spring 24 is provided between the lower holding member 23 and the inner wall of the lower holding member 23 to urge the lower holding member 23 in the direction of the arrow in FIG. Furthermore, a push button 25 is provided protruding from the side surface of the lower holding member 23,
The push button 25 protrudes from the front surface of the base 20. Then, by operating the push button 25,
The lower holding member 23 can be moved in the direction opposite to the arrow in FIG. 4 against the bias of the spring 24. Incidentally, reference numeral 26 denotes an engaging protrusion, which is embedded in the lower holding member 23 and supported so as to be able to protrude and retract from the upper surface thereof, and is biased in the protruding direction by a spring 27. ing.

In addition, the lower direction member 23 has grooves 28, which have a narrow width at the center and gradually widen toward both ends, as shown in FIG.
is formed. The groove 28 holds the tape core wire 2 along the side surface, and has a depth corresponding to the width of a group of strands to be separated, that is, in the case of the embodiment, approximately the width dimension of the tape core wire 2. It has half the depth. In addition, the narrow part at the center and the wide parts at both ends are curved into a gently curved surface, and the curvature is set to be larger than the minimum bending radius allowed for the tape core wire 2, for example, about 20 to 40 mm. has been done.

On the other hand, a shaft 29 is provided at the end of the base 20, and an upper holding member 30 that is superimposed on the lower holding member 23 and holds the tape core 2 is rotated on the shaft 29. Supported for free movement. The upper holding member 30 includes two members 30a and 30b, each of which is rotatable about an axis.
These members 30a and 30b are removably fixed to the lower holding member 23 by a magnet 7 having a structure similar to that of the separation tool provided on the lower surface thereof. Further, the upper holding member 30 is formed with a groove 31 that forms a series of spaces with the groove 28 by being overlapped with the lower holding member 23.
Similarly to the groove 28, the groove 1 is composed of a narrow part at the center and wide parts at both ends. Further, the depth of the groove 31 is the depth corresponding to the width dimension of another group of strands to be separated from some of the strands 2a inserted into the groove 28, that is, in the case of the embodiment, the tape core wire The width dimension is set to half of 2. Further, an engagement hole 32 into which the engagement protrusion 26 is inserted is formed on the lower surface of the upper holding member 30.
By operating the push button 25, the engagement hole 32 can engage with the engagement protrusion 26 of the lower holding member 30 that moves in the direction opposite to the arrow, thereby restricting its movement at a certain position. .

Using the separating tool and shearing tool configured as described above, the tape core wire branching operation is performed according to the following steps.

Insert the end of the tape core wire 2 in the range to be branched into the groove 3 of the separation tool, cover it with the end holding member 5, and attach the magnet 7.
It is fixed to the base 1 by the protruding parts 6 and pushed into both ends of the groove 3 to be held.

ii When the central pressing member 8 is opened, a blade 9 protrudes from the lower surface of the central pressing member 8 (to the extent that it slightly bites into the surface of the coating 2b of the tape core wire 2), and a blade also slightly protrudes from within the groove 3. 13 bites into the coating 2b of the tape core wire 2.

iii When the separating tool and the tape core wire 2 are moved relative to each other with the blades 9 and 13 biting in, the flaw that forms the boundary at the center of each two strands of the tape core wire 2 to be branched becomes a straight line. It is attached to the shape.

iv Remove the tape core from the separation tool and attach it to the shearing tool. That is, as shown in FIG. 15, the lower half of the wire 2a to be separated is fitted into the groove 28 of the lower holding member 23, and as shown in FIG. 16, the fitted tape core wire 2 is held with the fingers. At the same time, one member 30a (or 30b) of the upper holding member 30 is placed over the upper holding member 30 to hold the tape core wire 2 between a part of the groove 31 and the groove 28.

V When you release your fingers from the tape core wire 2 and place the other member 30b of the upper holding member 30 on the lower support member 23, the tape core wire 2 is held in a predetermined position of the shearing tool as shown in FIG. be done.

vi Press the push button 25 as shown in FIG. 17 to move the lower holding member 23 in the direction opposite to the arrow in FIG. 4. At this time, the upper engagement protrusion 26 of the lower side holding member 23 is first pressed by the lower surface of the upper direction member 30,
When the spring 27 is compressed and then reaches the lower position of the engagement hole 32 by movement of the lower holding member 23, as shown in FIG. The lower holding member 23 is inserted thereinto to restrict movement of the lower holding member 23. Then, such upper and lower holding members 23 and 30
Due to the relative movement of , shearing force acts on the tape core wire 2,
This shearing force concentrates on the flawed portion of the tape core wire 2 and tears the coating 2b in this portion.

vii As shown in FIG. 18, when the shearing tool or tape core wire 2 is pulled and moved relatively, the strands 2a in the range guided by the grooves 28 of the lower holding member 23 and the upper holding member A shearing force acts between the strands 2a in the range guided by the grooves 31 of 30, and the tape core wire 2 is sequentially torn.

During this tearing, the tape core wire 2 is guided by the sides of the upper and lower grooves 28 and 31 curved with a large radius, so that
No transmission loss occurs due to bending.

vui After the tape core wire 2 at the predetermined position is torn,
When the upper holding member 30 is opened and the tape core wire 2 is taken out, the branching operation is completed. Moreover, by opening the upper holding member 30, the engagement between the engagement protrusion 26 and the engagement hole 32 is released,
As a result, the lower holding member 23 moves in the direction of the arrow in FIG. 4 along with the elastic return of the spring 24, and returns to the initial position (the position shown in FIG. 4) while protruding the push button 25.
The next work is ready.

In addition, in the above operation, by moving the separating tool or shearing tool using a member such as a rail and using this member as a ruler, the tape core wire is aligned with the groove of the separating tool or shearing tool. It is possible to maintain the straight line and prevent the phenomenon of being bent extremely small.

Further, when holding the tape cable core 2, it is desirable to use a ramp as shown in FIG. 1O to prevent it from being excessively bent near the holding location. That is, this jig has elastic members 41 and 4 made of rubber or the like curved into a cylindrical surface inside a metal main body 40 bent in a U-shape.
1 are provided facing each other, and the tape core wire 2 is sandwiched between them. By holding the tape core wire 2 using such a ramp, it is possible to prevent the tape core wire 2 from being bent at an extremely small curvature during the process of moving the tape core wire 2 in the longitudinal direction.

Furthermore, as shown in FIG.
When attempting to branch a tape core having a structure in which two sets of tape cores consisting of a are further integrated by an outer coating 2C, a shearing tool as shown in FIGS. 12 and 13 is used. This is desirable.

In addition, this tool has lower and upper holding members 23 and 30,
Grooves 28' and 31'' are provided separately from the grooves 28 and 31.

In such a shearing tool, by changing the state from the state shown in FIG. 12 to the state shown in FIG. 13, relief can be created above the grooves 28 and 31, so that the tape center It is also possible to prevent the generation of chips due to the cut portion of the wire 2 rubbing against the lower surface of the upper holding member 30.

In addition, in the explanation of the branching method in the above embodiment,
I tried to make a scratch along the border that should be cut in advance, but
As shown in FIG. 11, there is a case where two sets of tape core wires, each consisting of a pair of strands 2a, are further integrated by an outer coating, and a tape core wire having a structure is to be branched. As shown with 2d, when branching a tape core wire that has a part that is easy to cut (a part where the thickness is thin and the shearing force is concentrated and is cheap), the scratching process is omitted and the main shearing is performed. Even if a shearing force is directly applied using a tool, the wires can be branched into a predetermined number of wires.

Furthermore, the width and depth of the grooves in the separation tool and the grooves in the shearing tool are not limited to those in the above embodiments, and can of course be changed as appropriate depending on the shape of the tape core wire or the number of fibers to be branched. It is.

Next, FIG. 19 shows a second embodiment of the present invention, and this shearing tool is a further improvement of the shearing tool used in the first embodiment. 2, and also ensures the fixation of M (upper holding member 30) during the separation operation.

That is, plate-shaped guide members 40 are fixed to both sides of the base 20 of the shearing tool of this embodiment, and the base 20
It protrudes from the upper surface over a height corresponding to the thickness of the upper holding member 30.

A fiber guide (groove) 41 into which the core wire 2 is inserted is formed in the center of the guide member 40 . This groove 4
1 has a depth approximately equal to the sum of the depths of the grooves 28 and 31, and its width is set approximately equal to the narrowest part at the center of the grooves 28 (and grooves 31).

Further, the guide member 40 is provided with a ball plunger 42, and the ball plunger 42 has a spherical engagement protrusion 43 provided on the mutually opposing inner surfaces of the guide member 40 so as to be freely retractable. Holding member 30
By engaging with the spherical recess 44 on the side of the holding member 30, the holding member 30 can be reliably fixed in the closed position.

In addition, as shown by the chain line in the figure, a permanent magnet 7 is provided on the upper surface of the base 20 and the lower surface of the upper holding member 30, and this permanent magnet 7 and the ball plunger 42 are used together to fix the upper holding member 30. You can do it like this.

The shearing tool configured as described above can be manufactured using the same procedure as the shearing tool of the first embodiment, that is,
Insert the core wire 2 into the groove 28, close the upper holding member 30 one after another, operate the push button 25 to slide the lower support member 23, and shift the positions of the grooves 28 and 31 to remove the core wire. Can be separated. In addition, core wire 2
When inserting the core wire 2 into the groove 28 on the lower holding member 23 side, the groove 41 of the guide members 40 on both sides of the base 20
is inserted and supported over its entire width, thus ensuring that it is inserted into the upper groove 31 when the upper retaining member 30 is closed.

Furthermore, since the guide members 40 provided on both sides of the lower holding member 23 are present so as to support the sides of the upper holding member 30, the shaft 29 provided at the base end of the upper holding member 30 is Misalignment of the upper and lower holding members 23 and 30, in other words, misalignment of the grooves 28 and 30, due to deflection, degrees, or play between them can be prevented.

Next, FIG. 20 shows a third embodiment of the present invention,
In this embodiment, a guide member 40A is provided at the tip of the upper holding member 30 in parallel with the side surface of the base 20 on the push button 25 side, and a ball plunger (not shown) provided on the inner surface of the guide member 40A is connected to the base 20. It is adapted to engage with a recess (not shown) on the opposing surface of the stand 20.

Furthermore, FIG. 21 shows a fourth embodiment of the present invention,
In this embodiment, bases 20 are provided on both sides of the upper holding member 30.
Alternatively, the guide member 4 parallel to the side surface of the lower holding member 23
A groove 41 similar to that of the second embodiment is provided in the guide member 40B, and a ball plunger (not shown) is provided between the guide member 40B and the lower holding member 23.
An engagement mechanism is provided by a recess (not shown) and a recess (not shown).

Note that, of course, instead of the engagement means using the ball plunger shown in the above embodiment, the upper holding member may be fixed by a mechanism that engages a mere non-spherical protrusion and a recess.

〔Effect of the invention〕

As is clear from the above explanation, with the configuration of the invention described in claim 1 of the present application, vertical scratches are made on the xi around the strands to such an extent that they do not reach the strands, and then It is possible to separate the required number of strands by tearing the coating between the strands without using wires, and it is possible to perform branching work without adversely affecting the information being transmitted in a live communication path. This has the effect of being able to do the following.

In addition, in the configuration of the invention described in claim 2 of the present application, the optical fiber ribbon is inserted into the groove on the base,
A part of the area to be divided is pressed by the end holding member and held in the groove, and in this state, by pressing with the central holding member, the cutlery provided in the central holding member and the groove opposite thereto is removed. By biting into the coating of the optical fiber tape and moving the tool in the longitudinal direction of the optical fiber tape in this state, it is possible to make scratches on the surface of the optical fiber tape that serve as boundaries for division.

Furthermore, with the structure of the invention described in claim 3 of the present application, an optical fiber ribbon is inserted into a groove provided on the base, and a part of the optical fiber ribbon is touched with a finger. A predetermined number of strands of wire can be accommodated in the grooves of the upper and lower members by pressing it with one member of the upper holding member while holding it, and pressing it with the other member while being held by this one member. . Next, by moving the lower holding member on the base, a shearing force is applied between the part held by the upper holding member and the part held by the lower holding member, and further, in this state, By moving the tool in the length direction of the optical fiber ribbon, the coating between one group of strands and the other group of strands is torn and the two are separated.

Furthermore, the configuration of the invention described in claim 4,
The relative positional displacement of the upper holding member and the base is regulated by the guide members on these sides, and the groove formed in the guide member allows the core wire inserted approximately half way into the groove of the lower holding member. Therefore, it is possible to easily attach the conductor to the device during the separation operation, and to accurately position the conductors in relation to the grooves, which are separated from each other by shearing, to prevent damage to the conductors. This has the effect of being able to prevent.

Furthermore, according to the invention described in claim 5,
By fitting the spherical surface and the four parts, the upper holding member and the base can be interconnected, and therefore the upper holding member can be reliably prevented from opening due to reaction force during shearing.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of a separation tool applied to the branching method of the present application, in which FIG. 1 is a perspective view showing the overall appearance, FIG. 2 is a plan view, and FIG. 4 is a sectional view of the part where the cutter is buried, FIGS. 4 to 7 show a first embodiment of the shearing tool applied to the branching method of the present application, and FIG. 4 is a perspective view showing the overall appearance. , Figure 5 is a side view, Figure 6 is a side view.
The figure is a front view, FIG. 7 is a plan view, FIGS. 8 and 9 are explanatory diagrams of the operation of the shearing tool in the first embodiment of the branching method of the present invention, and FIG. 10 is a clamp applied to the branching method. FIG. 11 is a cross-sectional view showing another example of the ribbon core branched by the branching method of the present invention, and FIGS. 12 and 13 are sheared diagrams of the tape core wire shown in FIG. 11. FIG. 14 is a sectional view showing still another example of the tape core wire branched by the branching method of the present invention, and FIGS. 15 to 18 are diagrams showing the operation of the shearing tool applied to the first embodiment. An explanatory diagram showing the core wire separation work using a shearing tool in the order of steps, FIG. 19 is a perspective view of a core wire shearing tool according to a second embodiment of the present invention, and FIG. 20 is a diagram showing a core wire shearing tool according to a third embodiment of the present invention. FIG. 21 is a perspective view of a core wire shearing tool according to a fourth embodiment of the present invention. l...Base, 2...Tape core wire, 2a...Element wire,
2b...Coating, 2c...Coating, 3...Groove, 4...
・Shaft, 5... End holding member, 6... Projection, 7.
...Magnet, 8...Central holding member, 9...Blade, 20...Base, 23...Lower holding member, 25.
...Push button, 26...Engagement protrusion, 28.28°.
...Groove, 29...Shaft, 30...Upper holding member, 31
・31゛...groove, 32...engaging hole, 40・40A・
40B... Guide member, 41... Fiber guide (groove), 42... Ball plunger, 43... Engaging protrusion, 44...・Concavity. Figure 1

Claims (1)

[Claims] 1. A tape core wire (2) formed into a tape by arranging a plurality of optical fibers (2a) in a row and integrally covering them is branched into vertical splits in a live wire state. In the branching method, a step of forming a scratch on the surface of the coating along the boundary between the strands of the tape core wire to be branched, and a step of forming a scratch on the surface of the coating along the boundary between the strands of the tape core wire, and separating the strands of one group with the formed scratches as the boundary. a step of holding the strands of the other group, a step of relatively moving the held strands of one group and the other group in a direction intersecting the surface of the optical fiber tape, and a step of relatively moving each of the strands of the other group in this step. 1. A method for branching optical fiber tape, comprising the step of moving a holding point of a group of optical fibers in the length direction of the tape. 2. A base (3) equipped with a groove (3) for holding a tape core (2) formed into a tape shape by arranging a plurality of optical fibers (2a) in a row and integrally covering them. 1), end holding members (5) rotatably supported by the ends of the base and fixing the tape core wire to the groove at both lengthwise ends of the groove, and these end portions. It is composed of a central pressing member (8) rotatably supported at the end of the base between the pressing members, and the central pressing member includes:
An upper cutter (9) is provided that slightly protrudes from the contact surface with the base and bites into the upper surface of the tape core wire in the groove,
A lower cutter (13) that bites into the lower surface of the tape core wire in the groove is located at a position facing the upper cutter in the groove.
1. A separation tool for optical fiber tape branching, characterized in that it is provided with a separation tool. 3. A tape core wire (2) formed into a tape shape by arranging a plurality of optical fiber wires (2a) in a row and integrally covering them is coated with a group of wires and other fibers along the boundary along its length. a lower holding member (28, 28') for holding the group of strands of the tape core wire along the side surface thereof, the shearing tool vertically splitting the strands into the strands of the tape core wire; 23
) is provided on the base (20) so as to be movable linearly in a direction intersecting the groove, and is movable at the end of the base between a position overlapping with the lower holding member and a position away from this position. An upper holding member (30) is rotatably provided, and the upper holding member has grooves (31, 31') for holding the other groups of wires protruding from the grooves of the lower holding member along the side surfaces. ), and the upper holding member is composed of a plurality of members (30a and 30b) divided along the length direction of the groove and rotatable relative to the base; The grooves of the lower holding member each include a narrow portion having a width that almost matches the thickness of the tape core wire, and wide portions provided on both sides of the narrow portion and whose width dimensions are gradually widened. A shearing tool for branching optical fiber tape. 4 A guide member (40, 40A, 4
0B), and the guide member is provided with a groove (41) having a depth greater than the sum of the depths of grooves (28 and 31) provided in the upper and lower holding members. The optical fiber tape branching shearing tool according to item 3. 5 The inner surface of the guide member (40, 40A, 40B) and the base (20) or upper holding member (3
0), there is a protrusion (43) that can be retracted from the surface.
) and a recess (44) that fits into the projection. 5. The optical fiber tape branching shearing tool according to claim 4, further comprising an engaging means consisting of a recess (44) that fits into the projection.