JPH09109227A - Nipple for Daruma type cable - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a nipple that can be commonly used for a plurality of Daruma type cable extrusions having different cable sizes. SOLUTION: A hole 5 for pushing out a messenger wire is provided at the center of the tip of a nipple 1, and a messenger wire forming a daruma type cable and a separation distance determined by a core size of an optical fiber cable are different. The core extrusion holes 6 ₁ or 6 ₂ of the plurality of optical fiber cables are provided radially at the tip of the nipple 1 with the messenger wire extrusion hole 5 as the center. A hole 6 for pushing out the core of the optical fiber cable is provided at the center of the tip of the nipple 1, and holes 5 ₁ , 5 ₂ , 5 for pushing out messenger wires of different cable sizes are provided.
₃ is provided radially at the tip of the nipple 1 around the hole 6 for core extrusion of the optical fiber cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nipple forming a pair with a die forming an extruder in a process of extruding a Daruma type cable.

[0002]

2. Description of the Related Art In the process of extruding a daruma type cable in which a messenger wire and a core of an optical fiber cable are integrally molded by coating a sheath material, a die corresponding to each cable size forming the daruma type cable is used. It was necessary to prepare a nipple. FIG.
As shown in FIG. 2, the nipple 21 has a hole 25 for pushing out a messenger wire and a hole 26 for pushing out a core of an optical fiber cable, and two holes 25 for pushing out at the tip of the nipple 21. The arrangement of and 26 is as shown in section CC. A hole 27 for pushing out a messenger wire coated with a sheath material and a hole 28 for pushing out a core of an optical fiber cable are provided at the tip of a die 22 paired with the nipple 21. The messenger wire and fiber optic cable cores extruded from the two holes 25 and 26 provided in the nipple 21 pass through the injection hole 23 when extruded from the two holes 27 and 28 provided in the die 22. Is covered with a sheath material that is injected into the die 22 to form a daruma-shaped cable and is extruded from the tip of the die 22. The two holes 27 and 28 provided at the tip of the die 22 are formed by a neck portion 29 made of a sheath material.
Are connected to form a Daruma-shaped cable,
The cross-sectional shape extruded as a daruma-shaped cable at the tip of the die 22 is as shown in the cross-section DD.

[0003]

The core size of an optical fiber cable varies depending on the cable configuration, purpose of use and the like. Also, the messenger wire cable size must be able to withstand the tension applied when used as a daruma type cable. That is, the two holes 25 and 26 provided at the tip of the nipple 21 and the two holes 2 having the neck 29 provided at the tip of the die 22.
7 and 28 need to be changed corresponding to the cable size of the Daruma type cable. Therefore, in order to manufacture various Daruma type cables, it is necessary to prepare a large number of dedicated nipples and dies. The present invention has been made to solve the above-mentioned drawbacks of the related art, and it is possible to manufacture a plurality of daruma-shaped cables having different cable sizes of the messenger wire and the core of the optical fiber cable with one nipple. Is what you are trying to do.

[0004]

SUMMARY OF THE INVENTION The present invention is a nipple used in an extrusion process in which a core of an optical fiber cable and a messenger wire forming a daruma type cable are covered with a sheath material and integrally molded, which is a nipple. A hole for messenger wire extrusion is provided in the center of the tip, and for the core extrusion of multiple optical fiber cables with different cable sizes with a separation distance that depends on the cable size of the messenger wire and the core of the optical fiber cable. Holes are radially provided at the tip of the nipple with the hole for pushing out the messenger wire as the center. In addition, a hole for pushing out the core of the optical fiber cable is provided at the center of the tip of the nipple.
Holes for wire extrusion are provided radially at the tip of the nipple.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG. FIG. 1 is a sectional view showing a structure of a nipple and a die according to the present invention. Extruder body 4
A nipple 1 fitted into an extruder body 4 is provided inside the die 2 attached to the so as to face the die 2, and the sheath material is injected from an injection hole 3. The embodiment shown in FIG. 1 shows a nipple capable of extruding two types of Daruma type cables having different core sizes of an optical fiber cable. The messenger wire pushing hole 5 is provided at the center of the tip of the nipple 1, and the core pushing holes 6 ₁ and 6 _{2 of} two optical fiber cables having different cable sizes are the messenger wire pushing holes. 5
Are provided symmetrically with respect to. The distance between the messenger wire push-out hole 5 and the optical fiber cable core push-out holes 6 ₁ and 6 ₂ depends on the size of each cable and is arranged as shown in the cross section AA. . Dedicated plugs are prepared for the core extrusion holes 6 ₁ and 6 ₂ of the optical fiber cable, and the plugs are inserted into the holes that are not used when the daruma type cable is manufactured. If the nipple 1 is formed in a hollow cylindrical shape, the weight of the nipple can be reduced.

As described above, the nipple may be shared by a plurality of Daruma type cables, but it is necessary to prepare a dedicated die for each. In FIG. 1, two dies for extruding a daruma type cable, which are respectively provided with cores of optical fiber cables having different cable sizes, are shown in duplicate. That is, the hole for the core extrusion of an optical fiber cable coated with a sheath in the die 2 corresponding to the holes ₆₁ for the core extrusion of the fiber optic cable in the nipple 1 is 9 _1, for messenger wire extrusion coated with a sheath The holes 8 are connected by a neck portion 7 ₁ made of a sheath material. Similarly, the core extruding hole of the sheathed optical fiber cable in the die 2 corresponding to the core extruding hole 6 ₂ of the optical fiber cable in the nipple 1 is 9 ₂ , and the messenger sheathed by the neck portion 7 ₂ . -It is connected to the wire 8. It should be noted that the cable extruding holes 8 and 9 ₁ and 9 ₂ provided at the distal end of the die 2 are more sheathed than the cable extruding holes 5 and 6 ₁ and 6 ₂ provided at the distal end of the nipple 1. It is thickened by the wall thickness and is arranged as shown in the cross section BB.

Next, a hole 6 for pushing out the core of the optical fiber cable is provided at the center of the tip portion of the nipple 1, and holes 5 ₁ , 5 ₂ , 5 for pushing out messenger wires of different cable sizes are centered around this hole. An example of a nipple provided with ₃ radially is shown in cross section AA in FIG. In this case, the nipple hole diameter can be adjusted by rotating the nipple around the core extrusion hole 6. Three types of dies corresponding to this nipple are required, but when they are collectively displayed, a cross section BB is shown. That is, the holes 6 and 5 ₁ , 5 shown in the cross section AA at the tip of the nipple 1
₂ , 5 ₃ correspond to 9 and 8 ₁ , 8 ₂ , 8 ₃ shown in the cross section BB at the tip of the die 2, respectively, and the holes 9 and 8 ₁ ,
8 ₂ and 8 ₃ are connected by neck portions 10 ₁ , 10 ₂ and 10 ₃ .

[0008]

As is apparent from the above description, the nipple for a Daruma type cable according to the present invention has a cable size of one of the core and the messenger wire of the optical fiber cable constituting the Daruma type cable. If the values are different, one nipple can cope with the extrusion process of several types of Daruma type cables. Therefore, it is possible to reduce the number of nipples to be prepared in the extrusion process of the Daruma type cable, and it is also possible to reduce the weight by forming the nipple into a hollow cylindrical shape.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the structure of a nipple for pushing a daruma type cable according to the present invention.

FIG. 2 is a sectional view showing another embodiment according to the present invention.

FIG. 3 is a cross-sectional view showing the structure of a nipple for extruding a Daruma type cable according to a conventional technique.

[Explanation of symbols]

 1 Nipple 2 Die 3 Injection hole 4 Extruder body 5,8 Hole for messenger wire extrusion 6,9 Hole for core extrusion of optical fiber cable 7,10 Neck

Claims (2)

[Claims] 1. A nipple that constitutes an extruder in an extrusion step in which a core of a fiber optic cable and a messenger wire that form a daruma type cable are covered with a sheath material and integrally molded. A hole for pushing out a messenger wire is provided, and a hole for pushing out a core of a plurality of optical fiber cables with different cable sizes is provided with a separation distance that depends on the respective cable sizes of the core of the optical fiber cable and the messenger wire. A nipple for a Daruma type cable, which is provided radially at the tip of the nipple centering around a hole for pushing out a wire. 2. A core-extruding hole for an optical fiber cable is provided at the center of the tip of the nipple, and a plurality of messenger wires having different cable sizes are radially arranged around the core-extruding hole for the optical fiber cable. The nipple for a daruma type cable according to claim 1, wherein the nipple is provided at a tip portion of the nipple.