JPH0990136A - Cut device for optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satisfactory cut end face by eliminating the slack of an optical fiber at the time of a cut operation. SOLUTION: A cut device 20 is provided with two front and rear clumps 26 and 27 for grasping the optical fiber 2a. The clumps are provided with rubber-made pedestals 28 and 29 and pressers 30 and 31. The pressers 30 and 31 are fitted to a cover 25 which can freely be opened/closed. The surface of the pedestal 28 at the terminal-side of the optical fiber 2a forms a taper-form at the external side. At the time of the cut operation of the optical fiber 2, the optical fiber 2a is loaded on the pedestals 28 and 29, and the pressers 30 and 31 are descended with the cover 25. The optical fiber 2a is grasped by the pressers 30 and 31 and the pedestals 28 and 29. Since a taper is attached to the pedestal 28 tension is operated on the optical fiber 2a and slack owing to the line habit of the optical fiber 2a can be removed at that time. Then, a cut blade 36 is moved and a scar is given to the lower face of the optical fiber 2a and a pressure tool 38 pushes/bends it from above and cuts it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cutting device for cutting an optical fiber into a good end face when connecting the optical fiber.

[0002]

2. Description of the Related Art When connecting optical fibers, it is necessary to obtain a smooth end face perpendicular to the fiber axis. To obtain such an end face, cutting devices based on the principle of the stress rupture method are often used. FIG. 4 shows a conventional optical fiber cutting device of this type. This cutting device 1 has an optical fiber 2
Clamps 7 and 8 at two positions before and after gripping a by the pedestals 3 and 4 and the presses 5 and 6, and a cutting for scratching the lower surface of the intermediate portion of the optical fiber 2a gripped by both clamps 7 and 8. A blade 9 and a pressing tool 10 for pressing and bending the optical fiber 2a from the upper side, that is, from the side opposite to the scratch to break the stress from the scratch are provided. The cradle 3 for the clamps 7, 8
4 and the pressing members 5, 6 are made of rubber, and securely hold the optical fiber 2a by elasticity as shown in FIG.

In the conventional cutting device 1, the pedestals 3 and 4 and the retainers 5 and 6 each have a surface parallel to the longitudinal direction of the optical fiber 2a to be placed on it. In FIG. 4, 11 is a base, 12 is a set stand, 1
3 is a lid. Reference numeral 14 denotes a fixing jig for holding the optical fiber core wire 2, which is placed on the set base 12 in a state where the optical fiber core wire 2 is gripped and is fixed by pressing with the closed lid 13. The optical fiber 2a is a coating 2 for the optical fiber core wire 2.
This is the part where b is removed.

When the optical fiber 2a is cut by this cutting device 1, the optical fiber 2a is held by the front and rear clamps 7 and 8 as shown in FIG.
The optical fiber 2 is cut by the cutting blade 9 that moves in the lateral direction orthogonal to a.
The lower surface of a is scratched, and then the optical fiber 2a is pressed and bent from the side opposite to the scratch by the pressing tool 10 to break the stress and cut.

[0005]

In order to obtain a good cutting end face in the above cutting device 1, the optical fiber 2a is used.
The optical fiber 2a must be constantly held in a constant state. However, if the optical fiber 2a has a line or the like, since one end (terminal side) of the optical fiber 2a is a free end, slack may occur in the middle portion of the grasped optical fiber 2a. There is a problem in that the scratches on 2a are not constant and a good cut end face may not be obtained.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and it is possible to obtain an excellent cut end face by making it possible to hold an optical fiber in a constant state without slack. An object is to provide a cutting device.

[0007]

SUMMARY OF THE INVENTION According to the present invention for solving the above-mentioned problems, a clamp at two positions before and after gripping an optical fiber with a cradle and a press, and a cradle at an intermediate portion of the optical fiber gripped by both clamps. In an optical fiber cutting device including a cutting blade for scratching a side surface and a pressing tool for pressing and bending the optical fiber from the side opposite to the scratch, at least one of the two clamps One of the features is that the upper surface of the pedestal of one of the clamps is formed in a taper shape so that the outside in the direction in which the clamps are aligned becomes lower.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention.
3 will be described with reference to the embodiment of FIG. 1 is a perspective view showing an optical fiber cutting device 20 according to an embodiment of the present invention, FIG.
[Fig. 2] is a simplified vertical sectional view of a state in which an optical fiber 2a is set in the cutting device 20 of Fig. 1. Reference numeral 21 is a base of the cutting device 20, and 22 is a set table. A guide groove 23 for accommodating the fixing jig 14 is provided on the upper surface of the set table 23.

A lid 25 is openably and closably attached to the upper portion of the set table 22 via a hinge 24. Optical fiber 2
Two clamps for gripping a at front and rear (direction of arrow a), that is, a first clamp 26 and a second clamp 27.
Are pedestals 28 and 29 attached to the base 21 side via blocks 32 and 33, and a retainer 3 attached to the lid 25 side.
It consists of 0 and 31. Both the pedestals 28 and 29 and the retainers 30 and 31 are made of rubber.

According to the present invention, the clamp on the terminal side of the optical fiber 2a, that is, the upper surface of the cradle 28 of the first clamp 26 is
The clamps 26, 27 are formed in a tapered shape so that the outside in the direction of arrangement (that is, the end side of the optical fiber 2a to be placed thereon: the left side in FIG. 2) is lowered. In addition, presser 30, 31
The pedestal 29 of the second clamp 27 has a surface parallel to the longitudinal direction of the optical fiber 2a.

Further, a cutting blade support block 35 is provided between the pedestal 28 on the side of the first clamp 26 and the pedestal 29 on the side of the second clamp 27 on the base 21 in the lateral direction (direction of arrow b) orthogonal to the optical fiber 2a. ), And a disc-shaped cutting blade 36 is rotatably attached to the cutting blade support block 35.

An arm 37 is attached to the set base 22 on the side opposite to the hinge 24 so as to be rotatable up and down as shown by arrow c, and the optical fiber 2a is attached to the tip of the arm 37 from above, that is, on the side opposite to the scratch. A pressing tool 38 is attached for pressing and bending to break the stress. The arm 37 has an L shape having a laterally extending base portion 37a, and is rotatably attached to the set table 22 at the base portion 37a.

A magnet 40 is attached to the upper surface of the set table 22, and a cover 41 corresponding to the magnet 40 is attached to the lid 2.
5 is attached. When the lid 25 is closed, the magnet 4
0 attracts the pad 41 and holds the lid 25 closed.

In the fixing jig 14 of the illustrated example, a pressing lid 43 is attached to a receiving plate 42 so as to be openable and closable, a first guide 44 and a second guide 45 are provided in front of and behind the receiving plate 42, and a slit 46 is formed in the second guide 45. Is provided, and the optical fiber core wire 2 is fixed.

When the optical fiber 2a is cut by the above cutting device 20, the optical fiber core wire 2 from which the coating on the terminal side has been removed is held by the fixing jig 14, and the fixing jig 14 is guided by the setting table 22. Stored in the groove 23, as shown in FIG.
The optical fiber 2a is attached to the pedestal 2 of the front and rear clamps 26 and 27.
Put on 8,29. In this state, there are many cases where the optical fiber 2a is slack due to a line. Then,
As shown in FIG. 3, the lid 25 is closed to press the fixing jig 14 and press the front and rear clamps 26, 27.
The optical fiber 2a is gripped at 0 and 31 at two positions in front and behind. At this time, since the upper surface of the pedestal 28 of the first clamp 26 is tapered (tapered so that the end of the optical fiber 2a becomes lower), tension acts on the optical fiber 2a as shown by arrow d, and Remove the slack of 2a, and use optical fiber 2a
Is held in a straight state under tension.

Subsequently, the cutting blade 36 is advanced in the lateral direction of the arrow b to scratch the lower surface of the optical fiber 2a, and then the arm 37 is rotated and tilted, and the optical fiber 2a is pushed by the pushing tool 38 at the tip. Bending from above, ie from the side opposite the scratch,
The scratches on the optical fiber 2a grow and the stress breaks. As described above, since the optical fiber 2a is grasped in a straight state with no slack and under tension, the cutting edge 36 always provides a good cutting end face.

In the above embodiment, the first clamp 2
The surface of the retainer 30 of 6 is parallel to the longitudinal direction of the optical fiber 2a, but the surface of the retainer 30 can also be tapered so as to match the pedestal 28. Further, depending on the case, it may be considered that both the pedestals 28 and 29 of both clamps 26 and 27 are tapered so that the outsides thereof are lowered. The taper shape is not limited to the case of a perfect flat surface, but also includes the case of a cylindrical surface having a slight curvature. Before and after 2
The retainers 30 and 31 of the two clamps 26 and 27 are fixed to the lid 25 attached to the set base 22 by the hinges 24, but are not necessarily limited to this structure. in short,
It is sufficient that the optical fiber 2a can be gripped together with the pedestal at two front and rear positions. In addition, the materials of the pedestal and the presser, the configuration of the cutting blade, the configuration of the pressing tool, the configuration of the fixing jig, etc. are not limited to those in the embodiment. Further, the present invention can be applied to a single-core optical fiber core wire and a multi-core optical fiber core wire.

[0018]

According to the present invention, since the upper surface of the pedestal of at least one of the two clamps before and after gripping the optical fiber is formed in a taper shape whose outer side in the clamp arranging direction becomes lower, When the optical fiber is gripped, tension can be applied to the optical fiber to remove the slack of the optical fiber. Therefore, the optical fiber can be gripped in a constant state at all times. It became possible to obtain the end face.

[Brief description of drawings]

FIG. 1 is a perspective view of an optical fiber cutting device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which an optical fiber to be cut is placed on the cutting device shown in FIG.

FIG. 3 is a vertical cross-sectional view of the cutting device in a state where the lid is closed and the optical fiber is gripped after the state of FIG. 2;

FIG. 4 shows a conventional optical fiber cutting device, and is a vertical cross-sectional view of a state in which an optical fiber is held.

5 is an enlarged left side view of a main part of the cutting device of FIG. 4, which is a diagram illustrating an operation of scratching an optical fiber by a cutting blade.

FIG. 6 is a vertical cross-sectional view of the cutting device when the optical fiber is cut by lowering the pusher following the state of FIG. 4;

[Explanation of symbols]

 2a Optical fiber 14 Fixing jig 20 Optical fiber cutting device 22 Set table 23 Guide groove 25 Lid 26, 27 Clamp 28, 29 Cradle 30, 31 Presser 36 Cutting blade 37 Arm 38 Pusher

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 26, 1996

[Procedure Amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Added

[Correction contents]

[Figure 5]

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Added

[Correction contents]

FIG. 6

Claims (1)

[Claims] 1. A clamp at two positions before and after gripping an optical fiber with a pedestal and a press, a cutting blade for scratching the surface of the optical fiber clamped by both clamps on the pedestal side, and In an optical fiber cutting device provided with a pusher for pressing and bending the optical fiber from the side opposite to the scratch, in the clamp alignment direction, the upper surface of the pedestal of at least one of the two clamps is arranged. A device for cutting an optical fiber, characterized in that it is formed in a tapered shape so that the outside thereof is lowered.