JPS6170505A - Optical fiber cutter - Google Patents

Abstract

PURPOSE:To prevent flaws in the cut part of an optical fiber bare conductor at the cutting time by providing a stopper which faces a cutting edge and is moved forward to support the other side face of the optical fiber bare conductor and is moved back ward to be separated from the optical fiber bare conductor. CONSTITUTION:When a stopper is moved backward by a length l1 and the length from a linear receiving face at the front end at the forward moving time to the outside peripheral surface of a sleeve 7 at the backward moving time is denoted as l2, l1<l2 is true. The stopper 9 faces a cutting edge 42 and supports the other side face of an optical fiber bare conductor F when moved forward and is separated from the optical fiber bare conductor when moved backward; and thereby, when an initial flaw is given to one side face of the optical fiber bare conductor F by a differential pressure of plural springs, the other side face is supported by the stopper 9, and an initial value is so determined that the shock of the cutting edge 42 is not transmitted to the optical fiber bare conductor F. The stopper is separated from the side face because of l1<l2 when a tension in the axial direction is applied to the optical fiber bare conductor, and the end part of the optical fiber bare conductor is brought into contact with the stopper surface and is not broken when the optical fiber bare conduc tor is pulled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical fiber cutting device, and relates to a device 2 for cutting, for example, a resin-coated bare optical fiber wire to which a connector is attached at the end face of the connector.

[Conventional technology]

Conventionally, devices for cutting bare optical fibers either cut the bare optical fibers held in a straight line with a rotating disc-shaped cutting blade, or cut the bare optical fibers on the surface of the bare optical fibers arranged along a curved cutting table. A structure was adopted in which a cutting blade is brought into contact with the cutting blade to make a cut in advance, and then a bending force is applied along the curved surface of the cutting table to open the cut portion.

However, with conventional equipment, the cutting blade cuts into bare optical fibers! Since the I impact force is applied, fine cracks are generated around the cut end of the bare optical fiber, resulting in a problem of large loss in optical transmission of the optical fiber.

To solve this problem, while applying a tensile force in the axial direction to the bare optical fiber, an initial scratch is created on one side of the bare optical fiber by a cutting blade in a direction perpendicular to this, and then the tensile force is used to initially straighten the bare optical fiber. There is a method of cutting the wire and creating a mirror surface with no scratches on the cut surface.

However, when this method is used, the stopper that supports the other side of the bare optical fiber against the cutting blade applies tension to the bare optical fiber to break it after the initial damage is caused by the cutting blade. There was a problem in that contact caused chips and scratches on this end.

[Problem that the invention seeks to solve]

The present invention prevents damage to the end of a bare optical fiber due to the impact of a cutting blade, and also prevents damage caused by contact with a supporting member when cutting the optical fiber by applying tension after the initial damage is made to the optical fiber. This is what I did.

[Means for solving problems]

The present invention involves pulling a bare optical fiber in the axial direction and moving a cutting blade back and forth using differential pressure between a plurality of springs in a direction perpendicular to the optical fiber, and using this cutting blade to cause an initial scratch on one side of the bare optical fiber. An optical fiber cutting device that cuts the optical fiber by a tensile force (1 gi) is equipped with a stopper that is placed opposite the cutting blade and supports the other side of the bare optical fiber wire when advancing, and separates from the bare optical fiber wire when retreating. and when the optical fiber is pulled and broken, by retracting the stopper, the stopper is kept at a distance of I!llt from the optical fiber,
This prevents the cut portion of the bare optical fiber from being damaged by contact with the stopper.

[Effect]

According to the present invention, a cutting blade is advanced from a direction perpendicular to the bare optical fiber wire to which a tensile force is applied in the axial direction by means of differential pressure between a plurality of springs, and the bare optical fiber wire supported by a stopper is cut into the bare optical fiber wire supported by a stopper. i! In addition, when pulling the bare optical fiber in the axial direction and cutting it, the stopper is separated from the bare optical fiber to prevent scratches from coming into contact with the stopper.

〔Example〕

Next, the configuration of an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a base formed in an abbreviated shape, and on the upper surface of this base 1 there is an optical fiber bare wire holder 2 that holds the bare optical fiber F, and an end of the bare optical fiber F held on the holder 2. There are provided a tensioning means 3 for pinching and pulling the optical fiber, and a cutting means 4 for imparting an initial flaw to the bare optical fiber F to which tension is applied to the tensioning means 3.

The surface of the optical fiber bare wire F is coated with resin and a connector 6 is attached to the sleeve 7 of the connector 6.
The end of the bare optical fiber INF protrudes from the tip.

The optical fiber bare wire holding stand 2 is provided in the center of the base 1, and a through hole 8 through which the sleeve 7 of the connector 6 can pass is opened at the side of the holding stand 2, and the other end of the through hole 8 is provided at the center of the base 1. A stopper 9 for raising the tip of the sleeve 7 inserted into the through hole 8 is provided in the opening.

The stopper 9 is provided on the holding base 2 with the tip line receiving surface 48 facing the cutting blade 42 so as to be movable forward and backward by a slide mechanism 49. The slide mechanism 49 is provided to protrude from the rear end of the stopper 9 in parallel to the holding base 2.

A guide rod 50, a coil spring 51 connected at one end to the guide rod 50 and expanding and contracting in the axial direction of the guide rod 50, a slide rod 52 coaxial with the guide rod 50 connected to the other end of the coil spring 51, and this slide. It is composed of a slide body 53 connected to a rod 52. Also, the coil spring 51
Both ends are supported by stopper pieces 54.54, and guide pieces 55.5 are inserted into the coil spring 51 from the stopper pieces 54.54.
5 is provided protrudingly. Furthermore, a stopper positioning body 5G that determines the retracted position of the stopper 9 is fixedly provided on the holding base 2 behind the stopper 9, so that the tip thereof does not escape from the end surface of the sleeve 7 when the stopper 9 is retracted. ing. That is, the retraction distance of the stopper 9 is 1
1. If the distance between the position of the tip line receiving surface 48 when the stopper 9 is advanced and the outer circumferential surface of the sleeve 7 in the backward direction of the stopper 9 is 12, then 11<12. Further, in the middle of the slide rod 52, there is a stopper piece 5 that engages with a slide positioning stop 57 that determines the forward position of the slide body 53.
8 is provided in a protruding manner, and a slide positioning stop 57 is fixed to the holding base 2.

Also, stopper holders 59 are provided on both sides of the stopper 9.
．． 60, one holder 59 is closely attached to one side of the stopper 9 and fixed on the holder 2, and the other holder 60 is held so as to be movable toward the other side of the stopper 9. It is slidably engaged on the pedestal 2, and when advanced, comes into close contact with the stopper 9 to fix the stopper 9 together with the other holder 59 on the holder 2.

Next, the tensioning means 3 is provided at one end of the base 1 parallel to the bare optical fiber F held on the holder 2. This tensioning means 3 has a clamping part 11, which is provided in a substantially U-shape and has a fixed chuck 1 at one end. A chuck support frame 13 provided with a chuck piece 12; a plurality of support shafts 14 easily attached to this support frame 13; A movable piece 16 having a movable chuck piece 15 that clamps the tip of the bare optical fiber F protruding from the stand 2;
A plurality of coil springs 17 are attached to the support shaft 14 between the support frame 13 and the support frame 13, and press the movable piece 16 to urge the movable chuck piece 15 in the direction of the fixed chuck piece 12.
An adjusting screw 18 is threaded onto the end face of the support frame 13 on the fixed chuck piece 12 side, and its tip abuts against the side surface of the movable piece 16 to adjust the gap between both chuck pieces 12 and 15. There is. Further, the movable chuck piece 15 has a shaft 19
It is rotatable around the center. The clamping portion 11 is provided at the end of a movable plate 22 that is slidably provided on a slide bearing 21 fixed to the base 1 in a pulling direction parallel to the bare optical fiber 11F. One end of a tension spring 23 is connected to the other end of the movable plate 22, and the other end of the tension spring 23 is connected to the end of a tension bar 25 having a lever 24 vertically disposed outside thereof.

This tension rod 25 is slidably provided on a support frame 26, and this support frame 2G is provided with a cut groove 21 on its upper surface that allows the lever 24 of the tension rod 25 to be moved in the sliding direction. 21, a plurality of locking grooves 28 are provided in the longitudinal direction of the support frame 26, into which the levers 24 are fitted.

A stopper 29 is provided on the top surface of the IC base 1 to abut against and position the lower part of the clamping part 11, and the clamping part 11 clamps the bare optical fiber F at this position.

The cutting means 4 is provided on the upper surface of the base 1 which is orthogonal to the tension means 3, and the cutting means 4 is mounted on a slide bearing 30 provided on the base 1, which is fixed to the lower surface of the movable plate 31. A moving plate 32 is provided so as to be slidable in the direction of approaching and separating from the holding base 2, and a sliding plate 35 fixed to the arm 34 is attached to a slide bearing 33 provided on the movable plate 31. It is provided so as to be slidable in the direction toward and away from the holding table 2. Then, the movable plate 31
A spring 36 whose one end is attached to the base 1 and urges the holding table 2 in the direction of separation is attached, and an adjustment screw 38 is attached to a support table 37 provided on the upper surface of the movable plate 31. A spring 39 is provided at the tip of the adjusting screw 38, which contacts the lff1e plate 35 of the arm 34 and causes the sliding plate 35 to slide in the direction of the holding table 2 by elasticity. This spring 39 is formed to have a smaller spring constant than the above spring 36, that is, this spring 39 is formed to have a smaller spring constant than the above spring 36.
The pressing force is small compared to the above.

Further, the end of the arm 34 facing the holding base 2 is bent downward to provide a mounting piece 40.
A cutting blade holder 41 is attached to 0.

This holder 41 is provided with a cutting blade mount 43 having a cutting blade 42 made of, for example, a diamond at its tip, which is movable in the direction toward and away from the side surface of the holder 2 by means of a holding shaft 44. A plurality of pressing springs 45 are provided in the cutting blade mounting base 41 and press the cutting blade mounting base 43 and the cutting blade 42 against the surface of the holding base 2. In addition, the above l/J cutting blade 42
The cutting edge of is located at a gap distance from the surface of the holding table 2, so that the bare optical fiber F having a height of h protrudes from the sleeve 7 of the connector 6 after cutting. Further, a stopper 41 is provided on the upper surface of the base 1 to abut against the lower end of the mounting piece 40 of the arm 34 to regulate the position.

Next, the cutting operation of the bare optical fiber F will be explained.

Optical fiber naked 1! The sleeve 7 into which the JF has been inserted is inserted into the through hole 8 of the holding base 2, and the sleeve 7 is fixed at a position where the sleeve 7 contacts the lower surface of the stopper 9.

Next, the ends of this bare optical fiber 1QF are held between the two V-pieces 12 and 15 of the holding part 11. At this time, since the movable chuck piece 15 is rotatably provided on the shaft 19, the bare optical fiber F can be held between the entire holding surfaces of both the chuck pieces 12 and 15.
The two chuck pieces 12 and 15 do not contact unevenly, and accidents such as breakage of the bare optical fiber F due to local concentration of clamping force are prevented. Then, the lever 24 of the tension bar 25 is pulled in opposite tension directions of the holding base 2 to fit into a predetermined locking groove 28 of the support frame 26, and tension is applied to the bare optical fiber F by the tension of the tension spring 23. At this time, since tension is applied to the bare optical fiber F by the tension of the spring 23, no large impact force is applied to the bare optical fiber F.

Next, in order to bring the wire receiving surface 48 of the stopper 9 into contact with one side of the circumferential surface of the bare optical fiber F, the slide rest 53 is advanced until the stopper piece 58 comes into contact with the slide positioning body 57. At this time, the wire receiving surface 48 of the stopper 9 elastically moves the optical fiber bare 1 due to the contraction force of the coil spring 51.
It comes into contact with one side of 11F.

1. Next, one movable side holder 60 is moved forward and pressed against one side of the stopper 9, and the stopper 9 is held and fixed between it and the other fixed side holder 59.

Next, the spring force of the spring 39 of the cutting means 4 is adjusted in advance with the adjusting screw 38, and the movable plate 31 is pressed in the direction of the holding part 2 against the spring 36, so that the cutting blade 42 is installed in the first position. The arm 34 that is being held is pressed by the elasticity of the spring 36.

At this time, the cutting blade 42 lightly contacts the optical fiber bare wire F, and when the movable plate 31 is further pressed, the pressing force of the movable plate 31 is weakened by the repulsive force of the spring 36 with a large spring constant, and therefore The pressing force of the arm 34 is also weakened. As a result, a pressing force equal to the difference in spring pressure between the springs 36 and 39 is applied to the bare optical fiber F, and an initial flaw is formed on the bare optical fiber F.

Next, when the pressing force of the movable plate 31 is released and the arm 34 is moved back, the cutting blade 42 is moved back.

Next, the holder 60 to which the stopper 9 is fixed is moved back to free the stopper 9.

Next, slide the slide rest 53 to IJ and stopper 9 1!2
It is moved back until the end hits the stopper positioning body 56.

At this time, the tip of the sleeve 7 is in contact with the stopper 9 since it is 11 x 12.

Next, the holding body 60 is advanced to hold the stopper 9 in the retracted position.

Then, when the stopper 9 retreats, the bare optical fiber F containing the first II (l) is gradually broken and cut from the scratched part by the weak tension of the tension spring 23 of the tension means 3.

Therefore, when applying the first 11 (1) to the bare optical fiber F, the impact of the cutting blade 42 is not applied to the bare optical fiber F due to the differential pressure between the springs 3G and 39, and after the initial scratch is applied, the tension of the spring 23 When the bare optical fiber F is broken by force, the bare optical fiber F does not come into contact with the stopper 9. Therefore, the end of the bare optical fiber F is not scratched and the cut surface becomes a mirror surface.
It is possible to reduce the optical transmission loss of the bare optical fiber 1fflF without the need for polishing the end face of the optical fiber.

Next, FIG. 7 shows another embodiment of the stopper 9, in which the height hl of the cutting blade 42 from the holding base 2 and the height hl of the center of the wire receiving surface 48 at the tip of the stopper 9 that receives the cutting blade 42. are made equal, and the area of the tip is narrowed, so that the area where the bare optical fiber F contacts the stopper 9 is reduced.

Further, the tip of the wire receiving surface 48 has eight surfaces, so that the thin wire receiving surface 48 prevents the bare optical fiber F from being damaged.

The structure in which the slide i structure 49 is connected to the stopper 9 and the holders 59 and 60 are exposed on both sides, and other structures and functions are the same as in the previous embodiment.

Further, in any of the embodiments, the cutting blade 42 and the stopper 9 can be removed each time the cutting operation is completed, and the tip thereof can be returned to the factory.

(Effects of the Invention) According to the present invention, while pulling the bare optical fiber in the axial direction, the cutting blade is moved back and forth by the differential pressure of N springs in the direction orthogonal to the optical fiber, and the cutting blade cuts one side of the bare optical fiber. In an optical fiber cutting device that cuts an optical fiber by an axial tensile force while changing an initial period, the cutting blade is placed opposite to the cutting blade, supports the other side of the bare optical fiber when advancing, and is separated from the bare optical fiber when retreating. Since a stopper is provided, when an initial flaw is caused on one side of the bare optical fiber wire by the differential pressure of multiple springs, the other side is supported by the stopper, and the initial flaw is formed without applying the impact of the cutting blade to the bare optical fiber wire. In addition, since the stopper of the sharpener that applies axial tensile force to the bare optical fiber is spaced apart from this side, when the bare optical fiber is drawn, the end will not come into contact with the stopper surface and break. Therefore, it is possible to prevent cracks, chips, and scratches from occurring at the ends of bare optical fibers, and to reduce optical transmission losses.

In addition, the cut surface of the bare optical fiber has a mirror finish, so there is no need to polish the end face, and after adjusting the actual length of the fiber at the site where the bare optical fiber is used,
Terminal processing 1 can be performed with extremely simple operations.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the optical fiber cutting device of the present invention, Fig. 2 is a partially cutaway plan view of its tensioning means, Fig. 3 is its side view, and Fig. 4 is its cutting means. FIG. 5 is an enlarged cross-sectional plan view of the cutting blade, stopper, and its slide mechanism, FIG. 6 is a sectional view taken along A-Afil, and FIG. 7 shows another embodiment of the sleeve. FIG. . F... Optical fiber bare wire, 9... Stopper, 36, 3
9. Spring, 42. Cutting blade.

Claims (1)

[Claims] (1) While pulling the bare optical fiber in the axial direction, a cutting blade moves back and forth using the differential pressure of multiple springs in a direction perpendicular to the optical fiber, and the cutting blade causes an initial scratch on one side of the bare optical fiber. In an optical fiber cutting device that cuts an optical fiber using an axial tensile force, a stopper is provided opposite to the cutting blade to support the other side of the bare optical fiber when advancing, and to separate from the bare optical fiber when retreating. An optical fiber cutting device characterized by: