JPS6057804A - Screening method of optical fiber - Google Patents

Abstract

PURPOSE:To reduce deterioration in strength during screening while evading the curvature of an optical fiber to be tested by holding the optical fiber linear and applying a tensile force. CONSTITUTION:A feeder 2 feeds the optical fiber 1 and a take-up device 3 takes up the optical fiber 1; and a couple of rolls 4a and 4b are arranged with rotating surfaces in contact, and the optical fiber 1 is run between those rotating surfaces. When the strength of the optical fiber 1 is checked, the take-up speed v2 is set larger than the feed speed v1 so as to tense the optical fiber 1 between both devices 2 and 3. The resulting tensile force depends upon the difference DELTAv=v2-v1 between both speeds, so a mechanism for adjusting the difference DELTAv is incorporated in a tensile force measuring instrument 5 to adjust the tensile force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical fiber screening method for testing the strength by applying tension to the optical fiber. Figure 1 shows a conventional screening method, in which the fixed axes -a, A pair of capstans b that can rotate freely in the center.
A movable tension reel c'4 is arranged between the capstan b1b and the tension reel clC between the capstan b1b and the optical fiber d between the tension reel c'4 and the tension reel c'4.
is suspended, and therefore, if the weight of the tension reel C is W, a tension of W/2 will act on the optical fiber d, and if the optical fiber d is run here,
This will tell you whether there are any parts along the entire length that cannot withstand the same tension.

However, in this conventional method, since the optical fiber d is wound around the tension reel C, the optical fiber d is bent, resulting in deterioration in strength.

The present invention aims to solve the above-mentioned problems by applying tension to the optical fiber while holding it in a straight line.This will be explained with reference to an embodiment shown in the drawings. A feeding device (2) and a bow-picking device (3) are placed at an arbitrary 21:4 position of the optical fiber (1) to be inspected. The feeding device (2+C) is for sending the optical fiber (1), and the pulling device (3) is for sending the optical fiber (
1), and specifically, a roll is used as shown in the figure. That is, in either device, a pair of rolls (41a, (4) +) are arranged with their rotating surfaces in contact with each other, and the optical fiber (1) is passed between these rotating surfaces. Since the optical fiber (1) travels by the rotation of these rolls, the optical fiber (11) and each roll (41a, (/11a,
(4) It is necessary to prevent slippage from occurring between

In the figure, (5) is a tension measuring device for measuring the tension of the optical fiber (11) between the two devices t21 and t31.

Here, the method for testing the strength of the optical fiber (1) is to operate the above-mentioned feeding device (2) and pulling device (3) to run the optical fiber (1). The take-up speed v2 is set higher than the feed speed v1 so that a tension of <l is applied between the optical fibers. Since the tension that changes at this time depends on the difference △v-v2-v1 between the two speeds, if a mechanism for adjusting the difference △V between the two speeds is built into the tension measuring device (5), the tension can also be adjusted. Become. In this case, it is also possible to input a tension setting value into the measuring device (5) and adjust the speed difference ΔV using an adjustment mechanism so that the tension converges to the setting value.

As described above, in the present invention, since the optical fiber to be tested is held in a straight state and tension is applied, the optical fiber does not bend, and therefore, strength deterioration during screening can be reduced. become.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the conventional screening method, Figure 2
The figure is an explanatory diagram of the screening method according to the present invention.〇+11... Optical fiber (2)... Feeding device (3)... Taking device Patent applicant's representative Patent attorney Makoto Ito Figure 1 Figure 2 too 4b.

Claims (3)

[Claims] (1) An optical fiber screening method characterized by maintaining a running optical fiber in a straight line between any two points to be tested and applying a predetermined tension to the optical fiber between the two points. (2) A feeding device for sending the optical fiber and a taking device for taking it off are provided at two arbitrary points on the optical fiber, and the taking speed of the optical fiber is set higher than the feeding speed. 2. The optical fiber screening method according to claim 1, wherein a predetermined tension of 44 is applied to the optical fiber between points. (3) The optical fiber screening method according to claim 2, wherein the feeding device and the taking device each include a pair of rolls that sandwich the optical fiber.