JPH01232309A - Method of fixing tension fiber to optical connector - Google Patents

Abstract

PURPOSE:To fix a tension fiber in a short period to an optical connector by winding the terminal part of the tension fiber to the shaft of an object which is installed in the housing of the optical connector and rotates only in one direction and rotating the shaft in one direction, then fixing the tension fiber in the state of exerting tension to the fiber. CONSTITUTION:The tension fiber 4 is built in an optical fiber cable 1 and the terminal part thereof is fixed to the shaft 7a of the object 7 which rotates only in one direction. The object 7 has the constitution like the constitution of, for example, a one-way clutch and is firmly fixed to the housing 6a. Fixing of the tension fiber is executed by removing the covering layer in the terminal part of the optical fiber cable 1 to expose the optical fiber 2 and the tension fiber 4 and mounting an optical connector ferrule 3 to the front end of the optical fiber 2, then cutting the tension fiber 4 to the length at which said wire can be wound >=3 times on the shaft 7a of the object 7 which rotates only in one direction, engaging the terminal part with the shaft 7a, and winding the same >=3 times to the shaft 7a. The tension fiber is thereby fixed to the shaft 7a while the fiber is held applied with the proper tension.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an optical connector for attaching an optical connector to the terminal of an optical fiber cable or optical fiber cord (hereinafter collectively referred to as an optical fiber cable) having built-in tensile strength fibers. The present invention relates to a method for fixing tensile strength fibers to.

(Prior Art) FIG. 2 is a side view showing an upper half section of an example of a conventional optical connector to which tensile strength fibers are fixed.

In the drawings, (1) is an optical fiber cable, (2) is an optical fiber core that constitutes the above cable, and (3) is an optical fiber core that positions and fixes the terminal part of the optical fiber (2) and the optical fiber to realize the connection. The optical connector ferrule (4) is a tensile strength fiber built into the optical fiber cable (+).

The above-mentioned tensile strength fiber (4) is taken out from the cutter of the outer coating of the optical fiber cable (1), and its terminal portion presses the optical connector ferrule (3) in the axial direction via the compression spring (!l). The push ring (12) extends along the outer circumferential surface of the tapered part at the rear end of the push ring (12), and the tensile strength fiber presser (■3) is attached thereto, and this is caulked to fix the tensile strength fiber (4). , or press the ring (12) using adhesive.
A method of adhesively fixing the fibers together with the tensile strength fibers (4) has been adopted. In the drawings, (+4) is a rubber boot that includes a tensile strength fiber presser (13) and is inserted onto the outer covering of the optical fiber cable (1) to protect the terminal portion thereof.

(Problem to be Solved) What is important in fixing the tensile strength fibers as described above is to fix the tensile strength fibers without causing any slack. This is because, as you can easily imagine when tension is applied to an optical fiber cable, if there is slack in the tensile strength fibers, the tension when pulling the optical fiber cable will be applied to the optical fiber core before the tensile strength fibers. However, the tensile strength fibers are no longer able to bear the tension.

However, according to the above-mentioned conventional method for fixing tensile strength fibers, the tensile strength fibers are sufficiently fixed using a push ring and a tensile strength fiber presser. The reality is that there are no conditions or work methods that allow for easy fixation.

(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides a method for fixing tensile strength fibers in a state where appropriate tension is applied to the tensile strength fibers. The terminal part of the tensile strength fiber contained in the cable or optical fiber cord is wrapped around the shaft of an object that rotates in only one direction, which is installed inside the housing of the optical connector, and the shaft is rotated in one direction to apply tension to the tensile strength fiber. The purpose is to fix it in a state where it is added.

Figure 1 is an explanatory diagram of an optical connector in which tensile strength fibers are fixed using the fixing method of the present invention.
0) is a partially cutaway vertical side view.

In the drawings, (1) indicates an optical fiber cable, (2) indicates a plurality of optical fiber cores constituting the optical fiber cable (1), and (3) indicates the terminal portion of the optical fiber core (2) and the optical fiber. An optical connector ferrule (4) for positioning and fixing and realizing connection is built into the optical fiber cable (1), and its terminal portion is fixed to the shaft (7a) of an object (7) that rotates in only one direction, which will be described later. tensile strength fiber, (5
) is the coupling part of the optical connector that houses the optical connector ferrule (3), and (B) is the object (7) that rotates in only one direction.
) and the exposed optical fiber (2), and is assembled at the rear of the optical connector coupling part (5).

Therefore, the object (7) that rotates in only one direction has a structure such as a one-way clutch, and is formed by a main body/rotating shaft (7a), and the main body part is a lower part forming the housing (8). It is firmly fixed to the housing (8a). The surface of the rotating shaft (7a) is processed to be low left so that the tensile strength fiber (4) can be easily wound thereon. Moreover, its size is such that the torque capacity in the reverse direction is commensurate with the tensile force of the optical fiber cable.

(Function) FIGS. 3(a) to 3(d) are explanatory diagrams of the procedure of the tensile strength fiber fixing method of the present invention.

■Remove the end coating layer of the optical fiber cable (1) to expose the optical fiber core (2) and the tensile strength fiber (4), and attach the optical connector ferrule (3) to the tip of the optical fiber core (2). ), as shown in the same figure (A), the tensile strength fiber (4) is attached to the axis (
7a) Cut to a length that can be wrapped three times or more.

(2) Tangle the end portion of the tensile strength fiber (4) around the shaft (7a) as shown in the figure (b).

■The state in which the shaft (7a) is rotated and the tensile strength fiber (4) is wound around the shaft (7a) three times or more as shown in the same figure (c), and a slight slack force is applied to the optical fiber core wire (2). Stop winding with .

■After that, as shown in the same figure (d), the optical fiber cable (
1) Move back a little in the direction of the arrow.

By doing this, the tensile strength fiber (4) can be applied to the shaft (7
a) is fixed. At this time, it is desirable to wrap the tensile strength fibers around the shaft three or more times to ensure firm fixation.

(Effects of the Invention) As explained above, according to the tensile strength fiber fixing force method of the present invention, by wrapping the tensile strength fibers around the shaft of an object that rotates in only one direction, such as a one-way clutch, adhesives and caulking It can be easily fixed by applying an appropriate tension without using tools, etc., and fixation can be achieved in a short time, and the desired tensile force can be easily obtained by changing the torque capacity of the one-way clutch.

It also has the advantage that the fixed length of the tensile strength fibers can be easily adjusted, and is effective not only for fixing ordinary optical fiber cables to optical connectors, but also for simple and temporary fixing.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of an optical connector in which tensile strength fibers are fixed by the fixing method of the present invention, where (A) is a vertical cross-sectional top view, and FIG. FIG. 2 is a side view showing a cross section of the upper half of a conventional optical connector to which tensile strength fibers are fixed. FIGS. 3(a) to 3(d) are explanatory diagrams of the procedure of the tensile strength fiber fixing method of the present invention. DESCRIPTION OF SYMBOLS 1... Optical fiber cable, 2... Optical fiber core wire, 3... Optical connector ferrule, 4... Tensile strength fiber, 5... Optical connector coupling part, 6... Housing,
7...An object that rotates in only one direction. '2J1 Illustration 2 Figure 3 11 is the third figure (a)

Claims (3)

[Claims] (1) Wrap the terminal part of the tensile strength fiber built into the optical fiber cable or optical fiber cord around the shaft of an object that rotates in only one direction, which is installed inside the housing of the optical connector, and rotate the shaft in one direction. A method for fixing tensile strength fibers to an optical connector, the method comprising fixing the tensile strength fibers in a state where tension is applied to the aforementioned tensile strength fibers. (2) The method for fixing tensile strength fibers to an optical connector according to claim (1), wherein the shaft surface of the object that rotates in only one direction is knurled. (3) Attach the tensile strength fiber to the axis of an object that rotates in only one direction.
The method for fixing tensile strength fibers to an optical connector according to claim 1, characterized in that the fibers are wound more than once.