JPS617807A - Optical fiber cutting device - Google Patents

Abstract

PURPOSE:To cut an optical fiber bare conductor without applying any impact force and to reduce optical transmission losses by pressing the cutting edge of a cutting means against the tensed optical fiber bare conductor with force as much as the differential pressure between plural springs. CONSTITUTION:The spring force of the spring 39 of the cutting means 4 is adjusted previously with an adjusting screw 38, and a movable plate 31 is pressed toward a holding part 2 against a spring 36. In this case, the cutting edge 42 contacts the optical fiber bare conductor F gently and when the movable plate 31 is further pressed, the repulsive force of the spring 36 having a large spring constant reduces the pressing force of the spring 39 to an arm 34. Consequently, the optical fiber bare conductor F is applied with the force as much as the differential pressure between both springs 36 and 39 to give an initial flaw to the optical fiber bare conductor F. This optical fiber bare conductor F is cut gradually from the position of the flaw with the weak force of the tension spring 23 of a drawing means 3. The cutting surface of the fiber bare conductor is a specular surface and the optical transmission loss is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber cutting device, which cuts, for example, a bare optical fiber coated with a resin and with the 21 nectar removed at the end of a connector. related to a device for

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

[Problems that the invention attempts to solve]

However, with all conventional devices, the cutting blade applies impact force to the bare optical fiber during cutting, resulting in minute cracks around the cut end of the bare optical fiber, resulting in loss of optical transmission through the optical fiber. The problem was that it was big. .

The present invention has been made in view of the above-mentioned problems, and provides an optical fiber cutting device that reduces the optical transmission loss of the bare optical fiber by cutting it by applying 'FM' force to the bare optical fiber. , is the one that hits the mark.

[Means for solving problems]

The present invention provides a tensioning means 3 for pinching and pulling the end of the bare optical fiber F held on the bare optical fiber holder 2. A cutting blade 42 is provided at the end facing the bare optical fiber F of the cutting means 4 which slides in a direction perpendicular to the line F and contacts the side surface of the bare optical fiber F to cause initial damage.

This is an optical fiber cutting Vf+ device which presses this cutting blade 42 against the bare optical fiber F by a differential pressure between a plurality of springs 3G and 39, for example, two springs.

[Effect]

In the present invention, a plurality of cutting blades of a cutting means are applied to a bare optical fiber wire held on an optical fiber bare Fl holding stand and given tension by tension means 1c, J: by applying a pressure difference of just one imitation to a plurality of cutting blades of a cutting means. It is pressed with a pressing force of .

(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 a 1l18L shape, and on the upper surface of this base 1 there is an optical fiber bare wire holding stand 2 which holds the bare optical fiber F, and an end of the bare optical fiber F held on this holding stand -2. A tensioning means 3 for clamping and pulling the part, and a cutting means 4 for causing an initial flaw in the bare optical fiber F to which tension is applied to the tensioning means 3 are provided.

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

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

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 is located on the right side of a clamping part 11, and this clamping part 11 is provided in a substantially U-shape, and a fixing tip 1 hook piece 12 is provided at one end ().
A jack support frame 13 is provided, and a plurality of support shafts 14 are disposed between the support frames 13, and are slidably provided on the support shafts 14, and are attached to and separated from the fixed jack piece 12 to hold the jack. Stand 2 h) A movable arm 16 having a movable arm 17 holding the tip of the bare optical fiber F protruding from the base 2 h)
The support shaft 1 between this movable piece 16 and the support frame 13
4 and presses the movable piece 16 to release the movable chuck piece 15.
A plurality of coil springs 17 that bias the fixed chuck piece 12 in the direction of the fixed chuck piece 12 are screwed together with the end face of the support frame 13 on the side of the fixed jaw piece 12, and the tip touches the side surface of the movable piece 16, and both the chuck pieces 18 are screwed together. 17 Adjustment screw 1 for adjusting the gap between the claw pieces 12.15
It consists of 8. In addition, "2 movable turtle/vine piece 1
5 is rotatably installed around publication 119. Then, this clamping part 111e opening;! The above optical fiber bare FAi is fixed to the base 1 and attached to the 11ni slide bearing 21.
It can be freely moved in the tensile force direction parallel to F! 1II
It is provided at the end of the I plate 22. One end of a tension spring 23 is provided at the other end of this movable plate 22, and the other end of this tension spring 23 is connected to the end of a tension bar 25 having a collar 24 arranged vertically on the outside. are connected.

This tension rod 25 is slidably installed on a support frame 26,
This support 1. ! 1 The frame 26 has a lever 2 of the tension rod 25 on the top surface.
A plurality of locking grooves 28 are provided which communicate with this groove 21 and move the lever 24 in the longitudinal direction of the support frame 26.
is provided. In addition, the above-mentioned holding part 1 is attached to the upper surface of the base 1.
1 to 29 are installed, and in this position the clamping part 11 holds the bare optical fiber F.
to hold.

The cutting means 4 is provided on the top surface of the base 1 which is orthogonal to the tension means 3, and the cutting means 4 is fixed to the top surface of the movable plate 31 on a slide bearing 30 provided on the bases. The 1'8 movable plate 32 is slidably moved toward and away from the holding base 2, and the arm 34 is attached to a slide bearing 33 mounted on the movable plate 31. The moving plate 35 fixed to the holding table 2
It is installed so that it can freely slide in the direction of coming into contact with and separating from it.

The movable plate 31 has a spring 36 whose one end is attached to the base 1 and which urges the holding base 2 in the direction of separation from the holding base 2.
is attached to the movable plate 31, and an adjustment screw 38 is screwed to the support base 37 provided on the upper surface of the movable plate 31.
A spring 39 is provided at the tip of the arm 34 to abut against the sliding plate 35 of the arm 34 and cause the sliding plate 35 to slide in the direction of the holding table 2 by elasticity.
The spring constant is formed to be small with respect to G, that is, the spring 39 is formed to have a small pressing force with respect to the spring 36.

Further, the end of the arm 34 facing the holding base 2 is bent downward and a four piece 40 is installed thereon, and a cutting n-blade holder 41 is mounted on this mounting piece 40. There is.

. This holder 41 has a cutting blade 42 made of, for example, a diamond at its tip. The cutting blade mounting base 43 is attached to the holding shaft 44.
GJ is provided so as to be slidable in the direction of inoculation 1 on the side surface of the holding table 2, and in this holder 41 there are a plurality of presses for pressing the cutting blade mounting table 43 and the cutting blade 42 against the surface of the holding table 2. A spring 45 is provided. The cutting edge of the cutting blade 42 is located at a gap distance λ11 from the surface of the holding table 2, and a bare fiber wire 1- of the optical fiber 7 with a length of h protrudes from the sleeve 7 of the connector 6 at a distance of 1 m4'M. Further, a stopper 47 is installed on the top surface of the base 1 to abut against the lower end of the mounting piece 40 of the arm 34 to regulate its position.

Next, we will explain the cutting operation of the optical fiber 7-bar bare wire.

Attach the connector 6 to the protective stand 2 and attach the bare optical fiber F to the clamping part 1.
It is held between both jack pieces 12 and 15 of 1.

At this time, since the movable chuck piece 15 is rotatably provided by lll1h19, both chuck pieces 12.1
The optical fiber bare wire F can be clamped by the entire clamping surface of the optical fiber wire F, and therefore, both chuck pieces 12 and 15 of the optical fiber bare wire F do not hit unevenly, and breakage of the optical fiber bare wire F due to local part of the clamping force is prevented. will be defended.

Then, the lever 24 of the tension bar 25 is pulled in the opposite tension direction of the holding base 2 to fit into the predetermined lock H;Hg of the support frame 26, and the optical fiber bare wire F
gives tension to. At this point, a large impact force is not applied to the bare wire F because the tension of the fiber 23 applies tension to the optical fiber I1.

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 pushed in the direction of the holding part 2 against the spring 36. 42 is attached and presses the arm 34 with the elasticity of the spring 36. At this time, the cutting blade 42 cuts the bare optical fiber F.
When the movable plate 31 is further pressed, the movable plate 31 is moved by the repulsive force of the spring 36 with a large spring constant.
The pressing force of the arm 34 by the spring 39 is also weakened. As a result, an IqI pressure equal to the difference in spring pressure between the two arms 36 and 39 is applied to the bare optical fiber F, and an initial 111J scratch is given to the bare optical fiber F by 3°, and this initial scratch is The entered bare optical fiber F is gradually broken and cut from the scratched part by the weak tension of the tension spring 23 of the tension means 3.

That light Fufiver Naked Fi! The cut surface of F becomes a mirror surface, and the optical transmission loss of the bare optical fiber can be reduced by polishing the end face of the bare optical fiber.

J3, FJJ section-r stage 4 is shown in Figure 6.
In addition, a spring 36 that presses the end of the arm 34 facing the holding base 2 is installed in contrast to a spring 39 that presses the end of the arm 34 opposite the holding base 2. of,
This spring 3G is attached to the tip of an adjustment screw 51 that is screwed into a support plate 50 set upright on the base 1. After adjusting the spring pressure of both springs 36 and 39 in advance, the movable plate 3
1 in the direction of the holding table 2, and the arm 34 is moved once against the spring 36 by the elasticity of the spring 39. .

At this time, since the spring constant of the spring 36 is set larger than that of the spring 39, the repulsive force of the spring 36 is larger than that of the spring 39, that is, the arm 34 is moved by an amount corresponding to the differential pressure between the two springs 36 and 39. Pressed with a weak pressing force.

In addition, the cutting edge of the cutting blade 42 in the above embodiment was separated from the holding table 2 by the distance of the gap, but as shown in FIG. A groove 55 with a depth of h is provided near the end (in this case, the opening of the through hole 8 of the holding base 2), and the tip of the sleeve 7 of the connector 6 is fitted with a stopper at a depth of h. 9 for positioning.

Further, an elastic cushioning material may be provided at the end of the stopper 9 of the holding table 2 facing the bare optical fiber F, so that the impact force applied to the bare optical fiber F by the cutting blade 42 can be further reduced. .

Further, in the above embodiment, the cutting blade is pressed by the differential pressure between the two springs 36 and 39, but the cutting blade may be pressed by the differential pressure using a plurality of springs.

(Effects of the Invention) According to the present invention, the cutting blade of the 19-stage cutter is applied to the bare optical fiber wire held by the bare optical fiber wire holder and given tension by the tensioning means. Since it is suppressed by a weak pressing force, it is possible to cut the bare optical fiber wire by giving an initial scratch without applying any impact force to the bare optical fiber wire with the cutting blade. It is possible to prevent
The optical transmission loss of the bare optical fiber can be reduced to 1.

In addition, the cut surfaces of optical fibers and bare wires have a mirror finish, so there is no need to polish the ends, and after adjusting the actual fiber length at the site where the bare optical fibers are used, terminals can be installed with extremely simple operations. It is possible to punish them.

[Brief explanation of the drawing]

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. A side view, FIG. 5 is a partially enlarged cross-sectional view of the cutting means, FIG. 6 is a side view showing a modification of the cutting means of the present invention, and FIG. 7 is a cutting blade and bare optical fiber holder of the present invention. FIG. 2. Optical fiber bare wire holding stand, 3. Pulling means, 4.
- Cutting means, 12.15... fixed chuck piece and movable chuck piece as chuck pieces, 36° 39... spring,
42... Cutting blade, 45... Pressing spring, F... Optical fiber bare wire.

Claims (3)

[Claims] (1) An optical fiber bare wire holder that holds a bare optical fiber, a tensioning means that clamps the end of the bare optical fiber held on the bare optical fiber holder and pulls it in the axial direction of the optical fiber, and a tensioning means that uses the tensioning means to A cutting means is provided with a cutting blade that slides in a direction perpendicular to a given bare optical fiber and contacts the side surface of the bare optical fiber at the end facing the bare optical fiber to cause initial damage. An optical fiber cutting device, characterized in that the cutting means is provided with a plurality of springs that press a cutting blade in contact with the bare optical fiber by a spring differential pressure. (2) Claims characterized in that the cutting means is provided with a pressing spring that presses the cutting blade against the bare optical fiber holder, and a gap is provided between the cutting edge of the cutting blade and the bare optical fiber holder. The optical fiber cutting device according to item 1. (3) The optical fiber cutting device according to claim 1, wherein the tensioning means includes a pair of chuck pieces, at least one of which is rotatable, which clamps the end of the bare optical fiber.