JP4175414B2 - Optical fiber coating removal device - Google Patents

Description

  The present invention relates to a coating removing apparatus and a coating removing method for removing a coating layer of an optical fiber.

For example, as shown in FIG. 8, the optical fiber 1 includes a fiber strand 1c made of glass fibers of a core 1a and a clad 1b, and a silicon layer or an ultraviolet curable resin layer outside the fiber strand 1c outside thereof. The structure has a primary coating layer 1d and a secondary coating layer 1e made of a nylon layer. When the optical fiber 1 having such a structure is inserted into a connector (hereinafter referred to as a ferrule) or the like, it is necessary to remove the coating layers 1d and 1e to expose the fiber strand 1c. The coating layers 1d and 1e are removed.
Note that the optical fiber 1 may have a configuration including a fiber strand made of glass fibers of a core and a clad and only a coating layer made of an ultraviolet curable resin layer.

  FIG. 9 is a plan view showing a configuration of a conventional optical fiber coating removal apparatus disclosed in Patent Document 1, for example, and FIG. 10 is a longitudinal sectional view of FIG. 9 and 10, the optical fiber 1 is attached to the coating removal apparatus 2, and the coating removal blade 3 is lowered perpendicularly to the optical fiber 1 from above the optical fiber 1, and the edge portion 3a is covered with the coating layers 1d and 1e. After being hardened, the coating removal device 2 and the coating removal blade 3 are rotated around the optical fiber 1 in order to cut the entire circumference of the coating layers 1 d and 1 e, and the coating removal device 2 is moved in the axial direction of the optical fiber 1. In addition, the covering layers 1 d and 1 e are removed by pulling away from the optical fiber 1. At this time, the cutting amount of the coating removal blade into the coating layers 1d and 1e is set in advance so that the edge portion 3a of the coating removal blade 3 does not contact the fiber strand 1c.

  Further, for example, as shown in Patent Document 2, when removing the coating layers 1d and 1e, the heating part is applied to the coating layers 1d and 1e and heated to the vicinity of the glass transition point of the material of the coating layer. A method for easily removing the coating layers 1d and 1e from the fiber strand 1c has also been proposed.

JP-A-61-219005 Japanese Patent Laid-Open No. 8-171021

  In the optical fiber coating removal apparatus as described above, as shown in FIG. 11, the axis of the optical fiber 1 when the heating unit 4 contacts the optical fiber 1 and the coating removal blade 3 are applied to the coating layers 1d and 1e. Depth of cut of the coating removal blade 3 into the coating layers 1d and 1e due to a deviation a between the optical fiber 1 and the axis of the optical fiber 1 when cut or due to uneven thickness of the coating layers 1d and 1e itself Therefore, when the coating layers 1d and 1e are removed, the frictional resistance between the fiber strand 1c and the coating layer 1d applied to the coating removal blade 3 or the frictional resistance difference between the coating layers 1d and 1e is caused. When the oscillation of the optical fiber 1 occurs, the fiber strand 1c of the optical fiber 1 and the coating removal blade 3 come into contact with each other, and damage to the fiber strand 1c is likely to occur, or the fiber strand 1c is broken. Question that becomes easy There was a point.

  In addition, as shown in FIG. 12, when the contact surface of the coating removal blade 3 with the coating layers 1d and 1e of the optical fiber is perpendicular to the axis of the optical fiber 1, the coating layers 1d and 1e are in contact with each other. The coating removal blade edge 3 is inserted to a predetermined depth in a state of being pushed through. Therefore, when the coating removal blade 3 is worn or missing, the coating layers 1d and 1e cannot obtain the predetermined cutting depth b, and therefore the coating layers 1d and 1e at the cut ends cannot be completely separated and the coating is applied. Since it is stretched, there is a problem in that the end portion is raised and the insertion into the ferrule in the subsequent process is hindered.

  In addition, when a plurality of coating removal blades 3 are used to cut the coating layers 1d and 1e, the cutting resistance generated in each coating removal blade 3 is caused by a difference in sharpness due to wear of each coating removal blade 3 or the like. Different. For this reason, the amount of cut into the coating layers 1d and 1e becomes non-uniform, and when the coating removal blade 3 enters the coating layer too deeply, the fiber strand 1c is likely to be damaged. It was.

  Further, when the coating layers 1d and 1e are removed at a time, the primary coating layer 1d cannot be heated sufficiently, so that the frictional resistance between the primary coating layer 1d and the fiber strand 1c is reduced. I can't. For this reason, the removal residue of the primary coating layer 1d remains on the fiber strand 1c, and there is a problem in that the fiber strand 1c is damaged by the coating removal blade 3 when the removal residue is removed.

  The present invention has been made to solve the above-described problems, and a first object is to provide an optical fiber axis line when the coating removal blade is cut into the coating layer of the optical fiber, and the original light. Even if there is a deviation between the fiber axis and the thickness of the coating layer itself is not uniform, there is a difference in the cutting depth of the coating removal blade into the coating layer. It is possible to obtain an optical fiber coating removal apparatus and a coating removal method that can prevent damage to the fiber or the fiber strands from being easily broken.

  The second object is that when the coating removal blade is worn out or chipped, when the coating removal blade is cut into the coating layer of the optical fiber and the coating layer is removed, the cutting edge of the coating layer is not covered. It is an object of the present invention to provide an optical fiber coating removal apparatus and coating removal method capable of suppressing the generation.

  The third object is to suppress the occurrence of damage to the fiber due to excessive cutting of the coating removal blade into the coating layer when a plurality of coating removal blades are used to cut the coating layer of the optical fiber. An optical fiber coating removal apparatus is obtained.

  A fourth object is that when the optical fiber is heated, when the coating removal blade is cut into the coating layer of the optical fiber to remove the coating layer, the removal residue of the coating layer remains on the fiber strand. Thus, a method for removing the coating of an optical fiber that can prevent the fiber strand from being damaged by the coating removing blade when removing the removal residue is obtained.

In the optical fiber coating removal apparatus according to the present invention, a coating removal blade that cuts the coating layer of the optical fiber to remove the coating layer, a rotating means that rotates the coating removal blade, and the optical fiber. A heating means for heating the coating layer to be removed of the optical fiber, a moving means for moving the coating removal blade and the heating means in the axial direction of the optical fiber, and the coating removal blade By physically contacting the surface of the coating layer of the optical fiber, the amount of cutting of the coating removal blade into the coating layer of the optical fiber is physically prevented from exceeding the projection amount of the coating removal blade. comprising a block, said coating removing blade is constituted by two removal blades wherein disposed opposite about the axis of said optical fiber, said coating removing blade is rotated by said rotating means The direction of cutting into the coating layer of the optical fiber is inclined with respect to the axis of the optical fiber so that the cut end of the removal end of the coating layer of the optical fiber is formed in a conical shape, and the optical fiber The contact surface to the coating layer is inclined with respect to the cutting direction .

  According to the coating removal apparatus of the present invention, a gap is provided between the optical fiber and the coating removal blade that cuts the coating layer of the optical fiber to remove the coating layer, the rotating means that rotates the coating removal blade, and the optical fiber. A heating means for heating the coating layer to be removed of the optical fiber, a moving means for moving the coating removal blade and the heating means in the axial direction of the optical fiber, and an attachment to the coating removal blade A block that physically prevents the amount of cut of the coating removal blade into the coating layer of the optical fiber from exceeding the amount of protrusion of the coating removal blade by contacting the surface of the coating layer of the optical fiber. When equipped with a plurality of coating removal blades to cut into the coating layer, the amount of cutting into the coating layer becomes non-uniform due to the difference in sharpness due to wear of each coating removal blade, etc. Also eliminates the come in question, it is possible to suppress the occurrence of damage to the fiber due to excessive cutting into the coating layer of coating removal blades.

Embodiment 1 FIG.
1 is a plan view showing a configuration of an optical fiber coating removal apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a side view of FIG. 3 is a side view showing a partial cross section of the main part viewed from the line III-III in FIG. 2, and FIG. 4 is a partial cutaway of the main part viewed from the line IV-IV in FIG. It is the top view shown with the cross section. 1, 2, 3, and 4, reference numeral 1 denotes an optical fiber as shown in FIG. 8. It has a structure having a primary coating layer 1d made of a layer or an ultraviolet curable resin layer and a secondary coating layer 1e made of a nylon layer on the outside thereof.

  Reference numeral 11 denotes a holding portion that holds the optical fiber 1 and is provided with a V-groove (not shown) for positioning the optical fiber 1. Reference numeral 12 denotes a heating unit that is attached to a rotating unit, which will be described later, and is provided with a gap between the coating layers 1d and 1e of the optical fiber 1, and a heater (not shown) that heats the coating layers 1d and 1e of the optical fiber 1. Embedded with a thermocouple. A coating removal blade 13 is attached to the heating unit 12 and cuts into the coating layers 1d and 1e of the optical fiber 1 to remove the coating layers 1d and 1e. The coating removal blade 13 is in the direction of the axis of the optical fiber 1. To move vertically. The optical fiber 1 of the coating removal blade 13 in which the coating removal blade 13 cuts into the coating layers 1 d and 1 e of the optical fiber 1 perpendicular to the axis of the optical fiber 1 and cuts into the coating layers 1 d and 1 e of the optical fiber 1. The contact surfaces of the coating layers 1d and 1e are inclined with respect to the cutting direction.

  Reference numeral 14 denotes a block attached to the coating removal blade 13, which is in contact with the coating layer 1e of the optical fiber 1 to control the amount of cutting of the coating removal blade 13 into the coating layers 1d and 1e of the optical fiber 1. 15 is a brush that removes the coating removal material (hereinafter referred to as residue) of the optical fiber 1 from the coating removal blade l1, 16 is a rotating unit that rotates the heating unit 12 and the coating removal blade 13, and 17 is an axis of the optical fiber 1. It is a moving axis which moves the heating part 12 and the coating removal blade 13 along.

  Next, the operation will be described. First, the optical fiber 1 is positioned and held in the V groove of the holding unit 11 so as to coincide with the axial direction of the optical fiber 1. The removal length of the coating layer of the optical fiber 1, the heating temperature corresponding to the optical fiber 1 to be coated, the heating time, and the removal speed of the coating layer are set by a control device (not shown). When the heating unit 12 is heated to a preset temperature and reaches the set temperature, the moving shaft 17 is moved to a predetermined position (coating removal position). Then, after the block 14 is brought into contact with the coating layer 1e of the optical fiber 1 and the coating removal blade 13 is cut into the coating layer 1e, the coating removal blade 13 is returned to the original position, and the rotating portion 16 is rotated by 90 °. The coating layer 1e is cut with the coating removal blade 13 again, and the coating layer 1e is cut.

  The cutting amount of the coating removal blade 13 into the coating layer 1e is such that the outer diameter of the coating layer 1d is 0.2 mm to 0.4 mm, for example, when the outer diameters of the fiber strand 1c and the optical fiber 1 are 0.125 mm and 0.9 mm. The cut amount is made smaller, for example, 0.19 mm to 0.23 mm. Moreover, the amount of cut into the coating layer 1d of the coating removal blade 13 described later is set to a clearance of 0.16 mm to 0.18 mm between the coating removal blades 13 and 13.

  Since the cutting amount can be controlled in this way, when cutting is made in the coating layers 1d and 1e using the plurality of coating removal blades 13 and 13, the coating layer is due to a difference in sharpness due to wear of each coating removal blade 13 or the like. The conventional problem that the amount of cut into 1d and 1e becomes non-uniform can also be solved, and the occurrence of damage to the fiber strand 1c due to excessive cutting into the coating layer of the coating removal blade 13 can be suppressed. Further, since the clearance between the coating removal blades 13 and 13 is set to be 0.16 mm to 0.18 mm, the optical fiber having a coating layer having a different material of the coating layer 1d or a coating layer having a different diameter of the coating layer 1e. However, the coating layers 1d and 1e can be removed without damaging the fiber strand 1c.

  Further, when the variation in the cutting depth of the coating removal blade 13 is ± δ, the direction in which the coating removal blade 13 cuts into the coating layers 1d and 1e of the optical fiber 1 is made perpendicular to the axis of the optical fiber 1 and the light When the contact surface of the coating removal blade 13 that cuts into the coating layers 1d and 1e of the fiber 1 can be mounted without being inclined with respect to the cutting direction, the amount of cutting varies as it is. ± δ of. On the other hand, as shown in FIG. 5, the direction in which the coating removing blade 13 cuts into the coating layers 1d and 1e of the optical fiber 1 is made perpendicular to the axis of the optical fiber 1 and the coating layer 1d of the optical fiber 1 is used. , 1e, the contact surface of the coating removal blade 13 to the coating layer 1d, 1e of the optical fiber 1 is inclined with respect to the cutting direction, for example, when it is attached at an inclination angle θ °, the conventional cutting is performed. The variation in the amount is ± δ * sin θ compared to ± δ, and the influence of the non-uniformity in the amount of the cut can be suppressed. For this reason, the fiber due to excessive cutting into the coating layer of the coating removal blade 13 Generation | occurrence | production of the damage of the strand 1c can be suppressed.

  Furthermore, the contact surface of the coating removal blade 13 cut into the coating layers 1d and 1e of the optical fiber 1 with respect to the coating layers 1d and 1e of the optical fiber 1 is inclined with respect to the direction of cutting into the coating layers 1d and 1e of the optical fiber 1. Since the contact surface of the coating removal blade 13 has a component that moves relative to the coating layers 1d and 1e, the coating removal blade 13 can be easily cut into the coating layers 1d and 1e. , 1e can be prevented from occurring at the cut end. Thereby, the ferrule insertion defect in a post process is eliminated.

  Further, the optical fiber 1 and the heating unit 12 are assembled so as to have a gap of about 0.5 mm, for example, and the optical fiber 1 is heated by radiant heat from the heating unit 12. Thus, since the clearance gap is provided between the optical fiber 1 and the heating part 12, the axis line of the optical fiber 1 in the state before the coating removal blade 13 is cut into the coating layer, and the coating removal blade 13 are covered. Even when a deviation from the axis of the optical fiber 1 when cut into the layer occurs or due to non-uniform thickness of the coating layers 1d and 1e themselves, the coating removal blade 13 is not applied to the coating layers 1d and 1e. Even when there is a difference in the cutting depth, the frictional resistance between the fiber strand 1c and the coating layer 1d applied to the coating removal blades 13 and 13 when the coating layers 1d and 1e are removed, or the frictional resistance between the coating layers 1d and 1e. When the optical fiber 1 oscillates due to the difference, the optical fiber does not contact the heating portion as in the prior art, so that the fiber strand 1c is damaged by the coating removal blade 13, or the fiber strand c can be suppressed that is easily broken.

  The removal of the covering layers 1d and 1e will be described with reference to FIG. First, as shown in FIG. 6A, the block 14 is brought into contact with the coating layer 1e, and the coating layer 1e is cut in the direction indicated by the arrow with the coating removal blade 13. Next, as shown in FIG. 6B, the moving shaft 17 is moved at a low speed, for example, 10 mm / s along the axis of the optical fiber 1 in the direction of the distal end of the optical fiber 1, that is, in the direction of the arrow shown in the figure. After separating the notched portion, the moving shaft 17 is moved at a high speed, for example, 100 mm / s to remove the separated coating layer 1e. After removing the coating layer 1e, the coating removal blade 13 is returned to the position before cutting, and the residue of the coating layer 1e adhering to the coating removal blade 13 is removed by the brush 15. After that, as shown in FIG. 6C, the moving shaft 17 is advanced to the coating removal position, and the coating removal blade 13 cuts the coating layer 1d in the direction of the arrow shown. After cutting the coating layer 1d, as shown in FIG. 6D, the moving shaft 17 is moved along the axis of the optical fiber 1 at a high speed, for example, 100 mm / s, toward the distal end of the optical fiber 1, that is, in the direction of the arrow shown. The portion where the cut is made in the coating layer 1d is separated, and the separated coating layer 1d is removed.

  Thus, by removing the coating layer 1d after removing the coating layer 1e, it is possible to directly heat the coating layer 1d with radiant heat from the heating unit 12 after the coating layer 1e is removed. The coating layer 1d can be easily removed from the fiber strand 1c, and the residue of the coating layer 1d can be prevented from remaining on the fiber strand 1c.

  Moreover, the removal speed of the coating layers 1d and 1e is low when separating the cut portion of the coating layer 1e, and is high when removing the separated coating layer 1e, and then the coating layer 1d is fast. By removing, it is possible to shorten the time for removing the coating layers 1d and 1e.

  In the above embodiment, two coating removal blades are arranged symmetrically with respect to the axis of the optical fiber and rotated by 90 °. However, a plurality of, for example, three coating removal blades are provided. It may be rotated by 60 °, or a single coating removal blade may be rotated approximately once or 360 °, and the same effects as described above can be obtained.

  Further, when the coating layer of the optical fiber is one layer, it may be applied according to the method of removing the coating layer 1d of the above embodiment, or even when the coating layer is three or more layers, You may apply according to the method of removing coating layer 1d, 1e, and there exists an effect similar to the above.

Embodiment 2. FIG.
FIG. 7 (a) is a perspective view showing a main part of an optical fiber coating removing apparatus according to Embodiment 2 of the present invention, and FIG. 7 (b) is an explanatory view of the main part of FIG. 7 (a). 7 (a) and 7 (b), reference numeral 18 is attached to a heating unit 12 (not shown) arranged symmetrically with respect to the axis of the optical fiber 1, and cuts into the coating layers 1d and 1e of the optical fiber 1. The coating removal blade 18 removes the coating layers 1d and 1e, and the coating removal blade 18 moves in a direction perpendicular to the direction of the axis of the optical fiber. The direction of cutting into the coating layers 1 d and 1 e of the optical fiber 1 of the coating removal blade 18 is inclined with respect to the axis of the optical fiber 1 and the optical fiber 1 of the coating removal blade 18 cut into the coating layers 1 d and 1 e of the optical fiber 1. The contact surfaces to the coating layers 1d and 1e are attached to be inclined with respect to the cutting direction. Other than this, the configuration is the same as that of the first embodiment, and thus the description thereof is omitted.

  The coating removal blade 18 configured in this manner is cut into the coating layers 1d and 1e, and the coating removal blade 18 is rotated by a rotating unit 16 (not shown), so that the cut ends of the coating layer 1d and 1e are removed. Is formed in a conical shape. For this reason, it becomes easy to insert the optical fiber 1 into the ferrule.

  7A shows an example in which two coating removal blades 18 and 18 are provided, but the coating layer 1d, The cut end of the removal end of 1e may be formed in a conical shape, and the optical fiber 1 can be easily inserted into the ferrule.

In the first and second embodiments, the heating unit 12 and the coating removal blades 13 and 18 are rotated around the optical fiber 1 in order to cut the entire circumference of the coating layers 1d and 1e. The drive shaft 17 may be retracted at a set speed without rotation.
In the first and second embodiments, the optical fiber 1 is manually supplied to the holding unit 11 to remove the coating layer, but the optical fiber 1 is directly held by a robot or attached to a jig. You may perform from the supply of optical fiber 1 to discharge | emission automatically to the coating removal apparatus of this invention.

  According to the coating removal apparatus of the present invention, a coating removal blade is provided that moves in a direction perpendicular to the direction of the axis of the optical fiber and cuts the coating layer of the optical fiber to remove the coating layer. The removal blade is constituted by two removal blades disposed so as to face each other with the axis of the optical fiber as a center, the cutting direction into the coating layer of the optical fiber is perpendicular to the axis of the optical fiber, and the optical fiber By inclining the contact surface to the coating layer with respect to the cutting direction, the variation in the cutting amount of the coating removal blade into the coating layer of the optical fiber becomes as small as ± δ * sin θ, so the cutting amount is not uniform. For this reason, it is possible to suppress the occurrence of damage to the fiber due to excessive cutting of the coating removal blade into the coating layer, and to cut the coating removal blade into the coating layer. No longer possible to prevent the burr is generated in the cut end portions of the cover layer.

  Further, the coating removal blade is constituted by two removal blades disposed so as to face each other with the axis of the optical fiber as a center, and inclines the cutting direction into the coating layer of the optical fiber with respect to the axis of the optical fiber, and By inclining the contact surface to the coating layer of the optical fiber with respect to the cutting direction, the coating removal blade cuts the coating layer and rotates the rotating part to which the coating removal blade is attached. Since the cut end of the removal end portion of the coating layer is formed in a conical shape, the optical fiber can be easily inserted into the ferrule.

  In addition, a plurality of coating removal blades are provided, the block being attached to the coating removal blade and contacting the optical fiber coating layer to control the cutting amount of the coating removal blade into the coating layer of the optical fiber. When cutting into the coating layer using, the conventional problem that the amount of cutting into the coating layer becomes non-uniform due to the difference in sharpness due to wear of each coating removal blade, etc. can be solved. Generation | occurrence | production of the damage of the fiber strand by the excessive cutting to a coating layer can be suppressed.

  According to the optical fiber coating removal method of the second aspect of the present invention, the optical fiber coating removal method is constituted by two removal blades arranged so as to face each other about the axis of the optical fiber, and the direction of cutting into the coating layer of the optical fiber is the light. A coating removal blade that is perpendicular to the axis of the fiber and whose contact surface to the coating layer of the optical fiber is inclined with respect to the cutting direction is moved in a direction perpendicular to the direction of the axis of the optical fiber. Cutting the secondary coating layer before the optical fiber having the primary coating layer and the secondary coating layer outside the primary coating layer, and the coating removal blade in the axial direction of the optical fiber by the moving means. Removing the secondary coating layer by moving the coating, returning the coating removal blade to the position before cutting by the moving means, cutting the primary coating layer, and the optical fiber A step of heating the primary coating layer by a heating means provided with a gap between the coating layer and a moving means for moving the coating removal blade in the axial direction of the optical fiber to move the primary coating layer. Removing the coating layer of the optical fiber from the optical fiber, the axis of the optical fiber in a state before the coating removal blade is cut into the coating layer, and the light when the coating removal blade is cut into the coating layer. Even if there is a deviation from the axis of the fiber, or even if there is a difference in the depth of cut into the coating layer of the coating removal blade due to the non-uniform thickness of the coating layer itself, the coating is removed when removing the coating layer. When the optical fiber swings due to the frictional resistance between the fiber strand on the blade and the coating layer, or the difference in frictional resistance between the coating layers, the optical fiber does not contact the heating part as in the past. It fiber is damaged by the coating removing blade, or that the fiber is easily broken can be suppressed.

  Further, the optical fiber coating layer is constituted by two removal blades disposed so as to face each other about the axis of the optical fiber, the direction of cutting into the coating layer of the optical fiber is inclined with respect to the axis of the optical fiber, and the coating layer of the optical fiber A coating removing blade whose contact surface with respect to the cutting direction is inclined in a direction perpendicular to the direction of the axis of the optical fiber, and a primary coating layer and a secondary coating layer outside the primary coating layer Cutting the secondary coating layer of the optical fiber having: removing the secondary coating layer by moving the coating removal blade in the axial direction of the optical fiber by moving means; The step of returning the coating removal blade to the position before cutting by means, the step of cutting the primary coating layer, and the heating means provided with a gap between the coating layer of the optical fiber, Primary coverage Heating the layer, and moving the coating removal blade in the axial direction of the optical fiber by the moving means to remove the primary coating layer from the optical fiber. Even if there is a deviation between the axis of the optical fiber in the state before being cut into the layer and the axis of the optical fiber when the coating removal blade is cut into the coating layer, or the thickness of the coating layer itself Even if there is a difference in the depth of cut into the coating layer of the coating removal blade due to non-uniformity, the frictional resistance between the fiber strand and the coating layer on the coating removal blade or the frictional resistance between the coating layers when removing the coating layer When the optical fiber swings due to the difference, the optical fiber does not come into contact with the heating part as in the conventional case. It is possible to prevent the bus wire is easily broken. Moreover, since the cut end of the removal end portion of the coating layer is formed in a conical shape, the optical fiber can be easily inserted into the ferrule.

  Furthermore, after separating the location where the moving means is moved at a low speed to cut the secondary coating layer, the moving means is moved at a high speed to remove the separated secondary coating layer; Removing the separated secondary coating layer, removing the separated primary coating layer by moving the moving means at a high speed to separate the cut portion of the primary coating layer; By providing, the removal time of a coating layer can be shortened.

It is a top view which shows the structure of the coating removal apparatus of the optical fiber which is Embodiment 1 of this invention. It is a side view of FIG. It is the side view which showed the principal part seen from the arrow III-III line | wire of FIG. It is the top view which showed the principal part seen from the arrow IV-IV line | wire of FIG. 3 in a partially broken cross section. It is explanatory drawing which shows the principal part of FIG. It is explanatory drawing which shows the coating removal method of the optical fiber in Embodiment 1 of this invention. FIG. 7A shows the main part of the optical fiber coating removing apparatus according to Embodiment 2 of the present invention, and FIG. 7B is an explanatory view showing the main part of FIG. 7A. It is explanatory drawing which shows the structure of an optical fiber. It is a top view which shows the structure of the conventional coating removal apparatus of an optical fiber. FIG. 10 is a longitudinal sectional view of FIG. 9. It is explanatory drawing which shows the principal part of FIG. It is explanatory drawing which shows the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber 1d Primary coating layer 1e Secondary coating layer 12 Heating part 13,18 Coating removal blade 14 Block 16 Rotating part 17 Moving shaft

Claims (1)

A coating removing blade that cuts the coating layer of the optical fiber to remove the coating layer;
A rotating means for rotating the coating removal blade;
A heating unit that is provided with a gap between the optical fiber and heats the coating layer to be removed by the optical fiber;
Moving means for moving the coating removal blade and the heating means in the axial direction of the optical fiber;
A block that is attached to the coating removal blade and prevents a cut amount of the coating removal blade into the coating layer of the optical fiber from exceeding a predetermined amount by contacting the coating layer surface of the optical fiber;
Said coating removing blade is constituted by two removal blades wherein disposed opposite about the axis of said optical fiber, said coating removing blade of the coating layer of the optical fiber by being rotated in the rotating means the direction in which cuts into the coating layer of the optical fiber so as to form a cut in the removal end conically is inclined with respect to the axis of the optical fiber, and an abutment surface to the coating layer of the optical fiber coating removal apparatus of the optical fiber you characterized in that is inclined with respect to the cutting direction.

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