JP2012073374A - Optical fiber cutting device - Google Patents

Abstract

The cutting performance can be kept constant even when the gripping force of an optical fiber holding section 2 changes.
An optical fiber is pressed by gripping both sides of a cutting position of an optical fiber that grips a covering portion with an optical fiber holding portion by clamps having a gripping surface of rubber, for example, rubber. 6 is an optical fiber cutting device that presses the cutting blade 5 down and cuts it, and the gripping force of the optical fiber use side clamp 3 is larger than the gripping force of the optical fiber disposal side clamp 4. When the optical fiber is pushed down by the optical fiber pressing member 6, the rubber amount of the waste side clamp 4 is always larger than the rubber amount of the use side clamp 3 regardless of the strength of the gripping force of the optical fiber holding portion 2. Become. For this reason, when the gripping force of the optical fiber holding portion is changed, the amount of the clamp material drawn is small, and the change of the tension applied to the optical fiber is small.
[Selection] Figure 1

Description

  The optical fiber held by the clamps on both sides of the cutting position is pressed by an optical fiber pressing member, thereby applying tension and simultaneously pressing the cutting blade against the cutting blade to cut the optical fiber, in particular, holding the optical fiber. Regarding clamps.

  As a method of cutting an optical fiber, there is a method of cutting an optical fiber by pressing a movable blade against the optical fiber with a tension applied to the optical fiber (bare fiber) to scratch the optical fiber. A tension is applied to an optical fiber, and a stress fracture occurs starting from a flaw, and a fracture surface perpendicular to the optical fiber axis is obtained (Patent Document 1).

In the invention of Patent Document 1, in the conventional method, when the movable blade is pressed against the optical fiber to which the tension is applied, the blade pressure with respect to the optical fiber varies greatly. Therefore, the movable blade is urged toward the optical fiber. In addition to providing a spring and cutting the optical fiber with a spring force that keeps the distance from the fixed end of the spring to the optical fiber constant, a constant blade pressure can be obtained at all times. .
In Patent Document 1, when the ferrule B is attached to the end portion of the optical fiber, the protruding portion (extra length portion) from the tip of the ferrule of the optical fiber is cut out by the movable blade 3, and the ferrule is the retaining tool. 15, the only gripping portion of the optical fiber is the chuck 16 that grips the tip end side of the optical fiber (FIGS. 4 and 5 of the cited document 1, paragraph numbers [0029] to [0032], reference numerals) Indicates the reference 1).

The optical fiber cutting device disclosed in Patent Document 1 presses a movable cutting blade against a tensioned stationary optical fiber to damage the optical fiber. There is a method of cutting the optical fiber by scratching the optical fiber by pressing the optical fiber against the cutting blade with an optical fiber pressing member so that the optical fiber can be elastically lowered when pressed instead of moving the optical fiber.
FIG. 9 schematically shows an optical fiber cutting device of such a cutting system, in which the coated optical fiber 1A is held by the optical fiber holding section 2 and the coated optical fiber (bare fiber) 1 is cut. Both sides of the power position are held by fixed clamps 53 and 54, the cutting blade 5 is disposed below the optical fiber 1 in the middle of both clamps 53 and 54, the optical fiber pressing member 6 is disposed above, and the optical fiber In this cutting method, the optical fiber 1 is pushed down to the cutting blade 5 by the pressing member 6 to apply tension to the optical fiber 1 and simultaneously press the optical fiber 1 against the cutting blade 5 to cut the optical fiber 1. A recess 6 a is formed in a portion of the optical fiber pressing member 6 that faces the cutting edge of the cutting blade 5.
Both the clamps 53 and 54 hold the optical fiber 1 with the lower clamps 53A and 54A and the upper clamps 53B and 54B, respectively, but the portion (clamp material) that contacts the optical fiber is made of an elastic body, for example, rubber 53c, 54c. ing.
In the conventional optical fiber cutting device, the widths W ₁ and W ₂ of the clamps 53 and 54 on both sides are equal.

The operation and action when cutting an optical fiber by the optical fiber cutting method of FIG. 9 will be described.
After the coated optical fiber 1A is gripped by the optical fiber holding part 2, the optical fiber is gripped by the clamps 53 and 54, and then the optical fiber 1 is pushed down by the pressing member 6, thereby simultaneously applying tension to the optical fiber 1 and cutting. The optical fiber is cut by pressing against the blade 5.
In this cutting operation, when the optical fiber 1 is pushed down by the optical fiber pressing member 6 to apply tension to the optical fiber, the optical fiber 1 is deflected by being pushed down to be shifted toward the center between the clamps 53 and 54 as indicated by an arrow. Following the optical fiber, rubber (clamp material) is pulled out from the clamps 53 and 54, and tension is applied to the optical fiber by the force with which the drawn rubber returns. Thereby, it becomes possible to give tension required for cutting to an optical fiber, without providing a mechanism which pulls an optical fiber with a movable clamp, and a cutting mechanism is simplified.

Patent Document 2 describes a clamp that holds an optical fiber on both sides of a cutting position in an optical fiber cutting device. The clamps (lower fixing portions 33, 33, upper fixing portions 71, 71) in this optical fiber cutting device are obtained by fitting rubber materials 33A, 71A on a metal base surface (FIG. 6, reference document 2). 10 and 12, paragraph numbers [0051] and [0052], and the reference numerals are those of the cited document 2).
The optical fiber cutting device of Patent Document 2 uses an optical fiber pressing member (breaking member) after horizontally scratching a circular cutting blade on an optical fiber held by clamps on both sides of a cutting position. This is a cutting method in which an optical fiber is pushed down to cause a stress fracture starting from a scratch and cut. This optical fiber cutting device is provided with a holding member 22 that functions as a stopper for a spring 21 that moves a circular blade member 20, and simply closes the upper box 11 with respect to the lower box 12. By operation, the stopper function of the holding member 22 is released, and the optical fiber can be scratched by the blade member 20.

JP 2000-56140 A Japanese Patent No. 3877005

  There are various types of optical fiber holders used as the optical fiber holder, and the gripping force of these optical fiber holders is not particularly specified. Therefore, the gripping force of the optical fiber holder used in the optical fiber cutting device varies, and some of the gripping force is weak and some are strong.

In the conventional optical fiber cutting device, the gripping force of the optical fiber holding part is not particularly considered.
However, when the gripping force of the optical fiber holding part is different, a phenomenon that the cutting performance is different has occurred.
As described above, the reason why the cutting performance is changed by changing the gripping force of the optical fiber holding portion is considered as follows.
When the gripping force of the optical fiber holding part 2 is weak, as shown in FIG. 9, when the optical fiber pressing member 6 is pushed down, the coated optical fiber 1A held by the optical fiber holding part 2 is pulled out as indicated by an arrow. The gripping by the optical fiber holding part 2 does not affect the pulling out of the rubber from both the clamps 53, 54. Therefore, the rubbers 53c, 54c of both the clamps 53, 54 are pulled out equally on both sides.
On the other hand, when the gripping force of the optical fiber holding part 2 is strong, when the optical fiber pressing member 6 is pushed down, the optical fiber firmly held by the optical fiber holding part 2 is removed from the optical fiber holding part 2 as shown in FIG. The rubber 53c of the clamp 53 on the optical fiber use side is pulled out little, and the rubber 54c of the optical fiber discard side clamp 57 is pulled out much. Tension is applied to the optical fiber by the force with which the pulled-out rubber returns, so that much tension is applied to the optical fiber by pulling out much of the rubber of the clamp.

As described above, the tension applied to the optical fiber changes because the amount of the rubber of the clamp pulled out changes depending on the gripping force of the optical fiber holding portion. Therefore, in an optical fiber cutting device, when an optical fiber holding part having a certain gripping force is used, even if the tension applied to the optical fiber is set to an optimum value, light having a different gripping force is used. When the fiber holding unit is used, the tension of the optical fiber changes from the optimum value, and the cutting performance changes. Specifically, the following phenomenon occurs. Note that setting the tension applied to the optical fiber to an optimal value means that the pressing amount h by which the optical fiber pressing member presses the optical fiber is set to an optimal value.
If the tension applied to the optical fiber is set to the optimum value when using an optical fiber holding part with a weak gripping force, the tension applied to the optical fiber becomes too strong when using an optical fiber holding part with a strong gripping force. It becomes defective. Specifically, the end face angle of the cut surface is not perpendicular to the optical fiber axis, and a non-mirror surface called a hackle is generated.
On the other hand, if the tension applied to the optical fiber is set to the optimum value when using the optical fiber holding part with a strong gripping force, the tension applied to the optical fiber becomes too weak when the optical fiber holding part with a weak gripping force is used. As a result, cutting becomes impossible and the cutting angle deteriorates.

  The present invention has been made in order to solve the above-described conventional problems, and even when an optical fiber holding part having various gripping forces is used as an optical fiber holding part used in an optical fiber cutting device, the tension applied to the optical fiber is not limited. An object of the present invention is to provide an optical fiber cutting device capable of minimizing the change of.

The invention of claim 1 that solves the above-mentioned problem is the optical fiber use side and the optical fiber discard side that sandwich the optical fiber that extends from the optical fiber coating portion held by the optical fiber holding part and that has the coating removed. An optical fiber cutting device that grips each of the two fixed clamps and presses down with an optical fiber pressing member to apply tension to the optical fiber and simultaneously presses and cuts the optical fiber,
At least the material of the clamp on the optical fiber disposal side is an elastic body, and the gripping force of the clamp on the optical fiber use side is larger than the gripping force of the clamp on the optical fiber disposal side.

  According to a second aspect of the present invention, in the optical fiber cutting device according to the first aspect, the clamp width of the clamp on the optical fiber use side is wider than the clamp width of the clamp on the optical fiber disposal side.

  According to a third aspect of the present invention, in the optical fiber cutting device according to the second aspect, the ratio value of the clamp width of the clamp on the optical fiber use side and the clamp width of the clamp on the optical fiber disposal side is in the range of 5/3 to 3. It is characterized by.

  According to a fourth aspect of the present invention, in the optical fiber cutting device according to the first aspect, the hardness of the clamp material on the optical fiber use side is higher than the hardness of the clamp material on the optical fiber disposal side.

  According to a fifth aspect of the present invention, in the optical fiber cutting device according to the fourth aspect, the material of the clamp on the optical fiber use side is a metal, a ceramic, or a resin.

According to the present invention, since the gripping force of the clamp on the optical fiber use side is larger than the gripping force of the clamp on the optical fiber disposal side, the optical fiber is held when the optical fiber gripped by both clamps is pushed down by the optical fiber pressing member. Regardless of the strength of the gripping force of the part, the amount of the clamp material drawn out from the clamp on the optical fiber disposal side is larger than the amount of the clamp material drawn out from the clamp on the optical fiber use side. For this reason, when the gripping force of the optical fiber holding part is changed (when using an optical fiber holding part having a different gripping force), the amount of the clamp material drawn is small, and the change of the tension applied to the optical fiber is reduced. Can do.
Therefore, even when the tension applied to the optical fiber is set to the optimum value when using the optical fiber holding part with weak gripping force, the tension applied to the optical fiber is set to the optimum value when using the optical fiber holding part with strong gripping force. Even in this case, the optimum value setting of the optical fiber tension is effectively maintained, and the cutting performance of the optical fiber cutting device can be maintained substantially constant.

It is the figure which showed typically the optical fiber cutting device of one Example of this invention. It is a perspective view which shows an example of the specific shape of the clamp in FIG. It is a perspective view which shows an example of the specific shape of the optical fiber holding | maintenance part in FIG. BRIEF DESCRIPTION OF THE DRAWINGS The cutting blade and cutting blade support mechanism in the optical fiber cutting device of one Example of this invention are shown typically, (b) is a side view, (a) is only the cutting blade support mechanism side in (b). It is the front view shown in the -C cross section. 1 is a perspective view of an optical fiber cutting device according to a specific embodiment of the optical fiber cutting device of the present invention. It is a front view of the optical fiber cutting device of FIG. FIG. 7 schematically shows a main structure of the optical fiber cutting device shown in FIGS. 5 and 6 and corresponds to a cross-sectional view taken along line AA in FIG. 6. FIG. 7 schematically shows a main structure of the optical fiber cutting device shown in FIGS. 5 and 6 and corresponds to a cross-sectional view taken along line BB in FIG. 6. It is the figure which showed the conventional optical fiber cutting device typically, and is a figure explaining the effect | action when the gripping force of an optical fiber holding part is weak with the problem regarding the clamp in the conventional optical fiber cutting device. In the optical fiber cutting device of FIG. 9, it is a figure explaining an effect | action when the holding force of an optical fiber holding part is strong.

  Hereinafter, an optical fiber cutting device embodying the present invention will be described with reference to the drawings.

FIG. 1 schematically shows an optical fiber cutting device according to an embodiment of the present invention, in which a coated optical fiber 1A is gripped by an optical fiber holding unit 2 and a coated optical fiber (bare fiber) 1 is removed. Both sides of the position to be held are held by fixed clamps 3 and 4, a cutting blade 5 is disposed below the optical fiber 1 in the middle of both clamps 3 and 4, and an optical fiber pressing member 6 is disposed above the optical fiber 1. In this cutting method, the optical fiber 1 is pushed down to the cutting blade 5 by the fiber pressing member 6 to apply tension to the optical fiber 1 and simultaneously press the optical fiber 1 against the cutting blade 5 to cut the optical fiber 1. A recess 6 a is formed in a portion of the optical fiber pressing member 6 that faces the cutting edge of the cutting blade 5.
The optical fiber side clamp 3 (that is, the optical fiber holding unit 2 side clamp) 3 used after cutting is called an optical fiber use side clamp, and the optical fiber side clamp 3 discarded after cutting is called an optical fiber disposal side clamp. This is called a clamp.
Both clamps 3 and 4 hold the optical fiber 1 with lower clamps 3A and 4A and upper clamps 3B and 4B, respectively. Specifically, for example, as shown in FIG. 2, the clamps 3 and 4 have a structure in which elastic members such as rubbers 3 c and 4 c are fitted and fixed in recesses provided on the upper surface of a metal base 3 d. The rubbers 3c and 4c are held in contact with the optical fiber. FIG. 2 is a view common to the two lower clamps 3A and 4A except that the clamp width W is different. The upper clamps 3B and 4B also have a structure as shown in FIG. 2 (but downward). Reference numeral 41 denotes a bolt for fixing the clamps 3A, 4A to the cutting device main body side.
Specifically, the optical fiber holding portion (optical fiber holder) 2 includes a lid 2b formed by attaching a rubber 2b ″ to a lid body 2b ′ of a ferromagnetic metal on a resin base 2a as shown in FIG. It is a structure that can be opened and closed by a hinge 2c, for example, a magnet is embedded in the base 2a, a ferromagnetic part (lid body 2b ′) on the lid 2b side is attracted to the magnet on the base 2a side, and the lid 2b is closed, The coated optical fiber 1A is gripped, and various optical fiber holding portions 2 are manufactured, and the gripping force is various.

In the present invention, the gripping force of the clamp 3 on the optical fiber use side is larger than the gripping force of the clamp 4 on the optical fiber disposal side.
Here, the gripping force of the clamp 3 on the optical fiber use side is larger than the gripping force of the clamp 4 on the optical fiber disposal side is that the optical fiber gripped by both the clamps 3 and 4 without gripping by the optical fiber holder 2. Is pressed down by the optical fiber pressing member 6 to apply tension to the optical fiber 1, and the optical fiber using side follows the optical fiber shifted toward the center between the clamps 3 and 4 by being pressed down and bent. This means that the amount of rubber (clamp material) drawn from the clamp 4 on the optical fiber disposal side following the optical fiber that is also displaced is larger than the amount of rubber (clamp material) drawn from the clamp 3.
In this embodiment, as a specific means for making the gripping force of the clamp 3 on the optical fiber use side larger than the grip force of the clamp 4 on the optical fiber discarding side, as shown in FIG. and a width W ₁ wider than the clamp width W ₂ of the clamp 4 of the optical fiber waste side.

As described above, if the clamp width W ₁ of the clamp 3 in the optical fiber used side wider than the clamp width W ₂ of the clamp 4 of the optical fiber waste side, friction against the optical fiber of the rubber 3c of the clamp 3 in the optical fiber used side Since the force is greater than the clamp 4 on the optical fiber disposal side, the gripping force is increased.
Therefore, when the optical fiber gripped by both the clamps 3 and 4 is pushed down by the optical fiber pressing member 6, it is pulled out from the clamp 3 on the side where the optical fiber is used regardless of the strength of the gripping force of the optical fiber holding portion. The amount of rubber drawn out from the clamp 4 on the optical fiber disposal side is larger than the amount of rubber. For this reason, when the gripping force of the optical fiber holding part is changed (when using an optical fiber holding part having a different gripping force), the amount of the clamp material drawn is small, and the change of the tension applied to the optical fiber is reduced. Can do.
Therefore, even when the tension applied to the optical fiber is set to the optimum value when using the optical fiber holding part with weak gripping force, the tension applied to the optical fiber is set to the optimum value when using the optical fiber holding part with strong gripping force. Even in this case, the optimum value setting of the optical fiber tension is effectively maintained, and the cutting performance of the optical fiber cutting device can be maintained substantially constant.
When the optical fiber pressing amount h of the optical fiber pressing member 6 is the same, when the amount of the clamp material pulled out from the clamp on the optical fiber disposal side is larger, the amount pulled out from both clamps is equal. The tension of the optical fiber is larger than in some cases, but the tension is set in the same state that the amount of the clamp material on the disposal side is pulled out (the optical fiber pressing member sets the push-down amount h that pushes down the optical fiber). There is no problem because there is.

Table 1 shows the results of an optical fiber cutting test in which an optical fiber was cut by setting clamps with various clamp widths to the optical fiber cutting device.
The rubber (clamp material) of the clamp used for the test is SBR (styrene butadiene rubber). The hardness of rubber is 70 ° (according to JIS K6253 durometer type A).
Clamp clamp width (= width of the rubber) is as described in Table 1, all the clamping width W ₂ of the optical fiber waste side is 3 mm, clamp width W ₁ of the optical fiber used side range 3mm~9mm There are 9 types. Note that the number of optical fibers subjected to the cutting test for each clamp width is not one but a plurality.
The thickness of the rubber 3c is 1.5 mm on both the optical fiber use side and the optical fiber discard side. The distance L inside the clamps 3 and 4 on both sides is 7 mm. The width B of the optical fiber pressing member 6 is 5 mm.
The optical fiber is a 0.125 mmφ quartz optical fiber. As the optical fiber cutting device, the optical fiber cutting device shown in FIGS.
The optical fiber holder 2 has a structure in which the base 2a is made of resin, and the lid 2b has a structure in which rubber 2b "is attached to a metal lid main body 2b '. The optical fiber holder used in the tests of Table 1 2 has only one (1 type), but uses an optical fiber holding part with a strong gripping force. As shown in Table 1, the optical fiber use side and the optical fiber discard side have the same clamp width (some In the case of 3 mm), the one that was defective in cutting was used.
In addition, although not described in Table 1, when an optical fiber holding part having a weak gripping force is used, cutting is performed even when the optical fiber use side and the optical fiber discarding side are all equal to 3 mm in clamp width. There is no defect. The defective cutting refers to a case where a non-mirror surface called a hackle is generated on the cut surface.
In Table 1, the width ratio refers to the ratio of the values for the clamp width W ₂ of the optical fiber waste side of the clamping width W ₁ of the optical fiber used side (W 1 _{/ W 2).}

  As shown in the test results of Table 1, cutting failure occurred when the clamp width on the optical fiber use side was 3 mm (width ratio 1.0) and 4.5 mm (width ratio 1.50) with respect to 3 mm on the disposal side. However, when the clamp width was 5 mm (width ratio 5/3 = 1.67) or more, good cutting was performed in which the cut surface was a mirror surface perpendicular to the optical fiber axis. In particular, good results were obtained in the vicinity of a clamp width of 6 mm on the optical fiber use side and a clamp width of 3 mm (width ratio 2.0) on the optical fiber discard side.

When the clamp material of the clamps on both sides is also rubber, the gripping force of the clamp on the optical fiber use side (hereinafter abbreviated as the use side clamp) 3 is more than the gripping force of the clamp on the discard side (hereinafter abbreviated as the discard side clamp) As a specific means for increasing, the use-side clamp width and the disposal-side clamp width may be the same, and the hardness of the use-side clamp rubber may be higher than the hardness of the discard-side clamp rubber.
As a degree of increasing the hardness of the rubber, it is preferable to select a rubber having a hardness that can obtain a good cut surface by performing a cutting test with various clamps having different hardnesses.
The same applies to the case where an elastic body that is not rubber is used, and the gripping force of the use side clamp can be increased by making the hardness of the elastic body of the use side clamp higher than the hardness of the elastic body of the discard side clamp.

As a concrete means for making the gripping force of the use side clamp 3 larger than the gripping force of the disposal side clamp 4, the clamp material of the disposal side clamp 3 is made of rubber, and the clamping material of the use side clamp 4 is made of metal, resin, ceramic, etc. A material having higher hardness than rubber can be used.
The same applies when the clamp material of the disposal side clamp uses an elastic body that is not rubber, and the clamp material of the use side clamp is made of a material that is harder than the elastic body of the disposal side clamp such as metal, ceramic, resin, etc. be able to.
When using a clamp material with high hardness, it is advisable to round the corners as necessary.

When an elastic body such as rubber made of the same material is used as the clamp material for both the clamps 3 and 4, the thickness of the elastic body of the use side clamp may be made thinner than the thickness of the elastic body of the disposal side clamp. However, the height level of the elastic body surface in contact with the optical fiber is the same.
Since the thickness is small, the gripping force can be increased as in the case where the hardness is high.

The clamps 3 and 4 for holding the optical fiber in the optical fiber cutting device are as described above, and examples of the specific structure of the optical fiber cutting device to which the present invention is applied are shown in FIGS. 5 to 8 are diagrams showing an example of a specific structure of the optical fiber cutting device 30, and FIG. 4 schematically shows a portion of the cutting blade and the cutting blade support structure in the optical fiber cutting device 30 of FIGS. It is a figure.
In FIG. 4, 5 is a diamond cutting blade, 13 is a resin blade base in which the cutting blade 5 is embedded and fixed, and 13 a is a rotary shaft integrally formed on both side surfaces of the blade base 13.
22 is a bearing member fixed to the base portion 25 of the cutting device body, 24 is a rotary shaft positioning member fixed to the upper surface of the bearing member 22, 26 is a spring that urges the cutting blade 5 side of the blade base 13 upward, Reference numeral 38 denotes a blade edge position adjusting screw that functions as a stopper that receives the opposite side (projecting portion 27) of the blade base 13 from the cutting blade 5 and stops the rotation of the blade base 13.
In the blade base 13, the side on which the cutting blade 5 is located is urged upward by a spring 26, the opposite protrusion 27 is received by a blade position adjusting screw 28, and the rotary shaft 13 a is perpendicular to the bearing member 22 side. it is positioned in a state in contact with the surface S ₁ and the inclined surfaces S ₂ of the rotating axis positioning member 24 side and is rotatable about a rotation axis 13a in this state.

5 is a perspective view of the optical fiber cutting device 30, FIG. 6 is a front view of the optical fiber cutting device 30 in FIG. 5, and FIGS. 7 and 8 are mainly related to the cutting mechanism in the optical fiber cutting device 30 in FIGS. FIG. 7 is a diagram corresponding to the AA sectional view of FIG. 6, and FIG. 8 is a diagram corresponding to the BB sectional view of FIG. FIG. 7 and FIG. 8 are for the schematic explanation of the cutting mechanism, and in particular, the display of the front-rear relationship in the direction orthogonal to the paper surface is not strict. In addition, the same code | symbol is attached | subjected to the part corresponding to each part in FIGS.
In these drawings, reference numeral 31 denotes a cutting device main body. A cutting lever 32 is attached to the cutting device main body 31 so as to be rotatable about a rotation shaft 33. The cutting lever 32 can be kept open by a support pin 36 for facilitating work.
The cutting device main body 31 is provided with a blade base 13 to which the cutting blade 5 is attached, and lower clamps 3 </ b> A and 4 </ b> A are provided on both sides of the blade base 13. Reference numeral 34 denotes a holder mounting portion for mounting an optical fiber holder (optical fiber holding portion 2) holding a coating portion of the optical fiber.
On the cutting lever 32 side, upper clamps 3B and 4B corresponding to the lower clamps 3A and 4A are provided, and an optical fiber pressing member 6 is provided between the two upper clamps 3B and 4B. Reference numeral 35 denotes a spring biasing the upper clamps 3B and 4B.
The bearing member 22 is fixed to the base portion 25 of the cutting apparatus main body 31, and the rotary shaft positioning members 24 attached to the bearing member 22 with bolts 38, and the rotary shafts 13 a on both sides of the blade base 13 to which the cutting blade 5 is attached. I support it.
Rotary shaft 13a is provided with a vertical surface S ₁ of the bearing member 22 side, in contact with the two faces of the inclined surface S ₂ of the rotating shaft positioning member 24 side is rotatably positioned.
Each of the bearing member 22 and the rotary shaft positioning member 24 is integrally provided with portions on both sides of the blade base 13.
The blade base 13 is urged upward by a spring 26 disposed in a recess of the bearing member 22. The end of the blade base 13 opposite to the cutting blade 5 is received by a screw 28 for adjusting the blade tip position. The screw 28 can be operated from a hole 40 formed in the base 25 to change the tip (upper end) position and adjust the blade tip position.
Reference numeral 41 denotes a bolt fixing the lower clamps 3A and 4A, and reference numeral 42 denotes a bolt fixing the upper clamps 3B and 4B.

In the above optical fiber cutting device 30, when the cutting lever 32 is pushed down and the optical fiber is pushed down by the optical fiber pressing member 6, the upper clamps 3B and 4B are lowered toward the lower clamps 3A and 4A, and the lower clamp 3A, The optical fiber placed on 4A is held by the upper and lower clamps. The optical fiber pressing member 6 pushes down the optical fiber at the same time as the optical fiber pressing member 6 pushes down the optical fiber with a slight delay after gripping the optical fiber by the clamps 3, 4.
At that time, the cutting blade 5 rotates slightly with the blade base 13 around the rotation shaft 13a, and the cutting blade 5 hits the optical fiber so as to rub the optical fiber by the rotation, so that a good fracture surface is formed in the optical fiber. Can be scratched.

1 Optical fiber (bare fiber)
1A Coated optical fiber 2 Optical fiber holder (optical fiber holder)
2a Base 2b Lid 3 Optical fiber use side clamp (Use side clamp)
4 Optical fiber discard side clamp (Discard side clamp)
3A, 4A Lower clamp 3B, 4B Upper clamp 3c, 4c Rubber (clamp material)
3d 5 Cutting blade 6 Optical fiber pressing member 6a Recess 13 Blade 13a Rotating shaft 22 Bearing member 24 Rotating shaft positioning member 26 Spring 27 Protruding portion 28 Screw 30 (for adjusting the blade tip position) Optical fiber cutting device

Claims (5)

The optical fiber from which the coating is removed extending from the optical fiber coating portion gripped by the optical fiber holding portion is gripped by two fixed clamps on the optical fiber use side and the optical fiber discard side sandwiching the cutting position, respectively. An optical fiber cutting device that applies a tension to an optical fiber by pressing down with an optical fiber pressing member and simultaneously presses the optical fiber against a cutting blade to cut the optical fiber,
An optical fiber cutting device characterized in that at least the material of the clamp on the optical fiber disposal side is an elastic body, and the gripping force of the clamp on the optical fiber use side is larger than the gripping force of the clamp on the optical fiber disposal side.   2. The optical fiber cutting device according to claim 1, wherein the clamp width of the clamp on the optical fiber use side is wider than the clamp width of the clamp on the optical fiber disposal side.   The optical fiber cutting device according to claim 2, wherein the ratio of the clamp width of the clamp on the optical fiber use side and the clamp width of the clamp on the optical fiber discard side is in the range of 5/3 to 3.   2. The optical fiber cutting device according to claim 1, wherein the hardness of the clamp material on the optical fiber use side is higher than the hardness of the clamp material on the optical fiber disposal side. 5. The optical fiber cutting device according to claim 4, wherein the material of the clamp on the optical fiber use side is metal, ceramic, or resin.

Images