JPS6250807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical fiber spacer cable processing device, and more particularly to a surface of an optical fiber spacer cable having a spiral groove and an optical fiber spacer for adjusting the groove into a predetermined shape. This invention relates to a cable processing device.

As shown in Fig. 1, the optical fiber spacer cable is made of a synthetic resin cable 1 which has a core material 3 in its center, with a plurality of concave grooves 2, 2... formed on the outer surface of the cable 1.
This is a long spacer cable in which an optical fiber (not shown) is disposed in grooves 2, 2, . . . .

Such fiber optic spacer cable 1
It is desirable that the cable be curved in a gentle spiral to protect the installed optical fiber itself, to provide strength against the extension of the spacer cable, and to improve the efficiency of installation work.

When such a spacer cable is processed using a metal material, high-precision conditions can be obtained due to the cutting process, but high-precision processing cannot necessarily be obtained when using relatively inexpensive resin processing.

To manufacture an optical fiber spacer cable made of resin material, a base is rotatably attached to the nozzle of a synthetic resin extrusion molding machine, and the base has a plurality of convex portions on its inner peripheral wall. (not shown), extrude the resin at the same time as the base is rotated, and by coordinating the rotation of the base and the extrusion of the resin, a plurality of spiral shapes are formed on the surface of the spacer cable. A method of forming a circular concave groove was used.

Figure 2 is a diagram of the completed optical fiber spacer cable manufactured in this way.As mentioned above, unlike metal processing by cutting, the cable is manufactured by rotating the base in a spiral shape. Due to the characteristics of the resin material, the width of the grooves 2, 2... may deform to a much larger extent than the outer diameter of the optical fiber 4, as shown in Figure 3a, or the width of the grooves may deform to a much larger extent than the outer diameter of the optical fiber 4, as shown in Figure 3b. However, the optical fiber 4 is deformed to a size smaller than the outer diameter, making it difficult to install, or the optical fiber 4 is completely deformed, resulting in locations where it cannot be installed.

The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to provide a concave groove having a predetermined shape in which an optical fiber can be easily and reliably disposed as shown in FIG. 4a. Alternatively, as another example, as shown in FIG. An object of the present invention is to provide an apparatus for processing an optical fiber spacer cable having a shape such as the above.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 5 is a conceptual diagram showing the entire manufacturing process when processing the surface and grooves of an optical fiber spacer cable using the processing apparatus according to the present invention.

In the figure, 10 is an overall view of the processing device according to the present invention, A is a correction rotating member for processing the surface and grooves of the optical fiber spacer cable 1, and B is
C is a frame that holds the correction rotation member A, and C is a bearing that allows the correction rotation member A to rotate freely.

20 is a synthetic resin extruder, 21 is its die head, and 22 is a die.

23 is a heat-retaining tank; 25 and 27 are indicators installed at the terminals of the frame of the heat-retaining tank 23 and equipped with through holes 26 and 28 through which the optical fiber spacer cable 1 passes; 24 is a pulling device for the spacer cable 1; be.

FIG. 6 is an enlarged cross-sectional view of a part of the correction rotary member A provided in the processing device 10, in which a is a front view and b is a side view.

In the figure, reference numeral 11 denotes a guide base, which has a cylindrical frame, and four rollers 16, 1 are installed inside the guide base 11 in a cross shape at a 90° angle.
Bearings 13 are mounted on both sides of each bearing fixing plate 12, 12, 12, 12, 12, 12, 6, 6, 6...
... is fixed by the bearing fixing plate 12,
12... are connected by screws 14 so as to be able to make fine adjustment movements in the radial direction via the guide base 11, and the upper ends of the screws 14 are fixed with stoppers 15.

Each contact surface 1 of the rollers 16, 16...
The center where 6a is concentrated is the spacer cable 1
There is a gap that is just large enough for the outer diameter of the tube to pass through.
On the opposite surface of the guide base 11 where the rollers 16, 16, . . . It is installed together with the base attachment part 18.

To explain the case of processing the surface of an optical fiber spacer cable using the optical fiber spacer cable processing apparatus having the above structure, first, the die head 21 and the die head 22 provided at the tip of the synthetic resin extruder 20 are rotated. At the same time, the resin wire constituting the optical fiber spacer cable 1 is extruded. The resin wire is gently twisted by the rotating action of the base 22 while at the same time forming the concave groove 2 in the spacer cable.

At this time, the groove 2 is often deformed because the wire is twisted and the wire's own temperature is high.
Next, the resin wire, that is, the spacer cable 1 passes through a heat-retaining tank 23 and reaches the processing device 10.

That is, the resin wire is guided while passing through the through hole 26 provided in the indicator 25, and then passes through the heat-retaining tank 23 so that the resin wire's own temperature does not drop. In this way, the correction rotating member A installed in the processing device 10 is reached.

Here, spacer cable 1 is connected to roller 1
6, 16, . . . are concentrated and pass through the gap created by the contact surface 16a formed at the center.

Then, it is completed by passing through the drawing hole 19 provided in the drawing die 17.

7 to 8 show further details of the modification of the spacer cable, in which the spacer cable 1 passes through the through hole 26 provided in the indicator 25,
As shown in FIG. 7, it is inserted through the center of the rollers 16, 16, . . . .

Contact surfaces 16a, 16 of rollers 16, 16...
Circumferential step portions 16b, 16b... protruding from one circumferential surface in the same shape as the concave groove 2 formed on one surface of the spacer cable are installed at a..., and the circumferential step portions 16b, 16b... ... is configured to automatically fit into the groove 2.

The rollers 16, 16, . . . follow the movement of the twisted concave groove 2 and are rotated by the operation of the bearing.

FIG. 8 shows the circumferential step portions 16b, 16b of the rollers 16, 16... in the groove 2 of the spacer cable 1.
... shows a cross-sectional view of the fitted state, and it can be seen that the deformed groove 2 is completely corrected, and at the same time, the surface of the spacer cable 1 is also press-corrected.

FIG. 9 is a perspective view showing a part of the optical fiber spacer cable completed through the processing apparatus described above, and it can be seen that the groove 2 into which the optical fiber is inserted is clearly formed.

It goes without saying that the processing apparatus of the present invention is not limited to the above-mentioned embodiment, and can be changed to any other apparatus without departing from the spirit of the present invention.

As described above, the present invention is configured such that a circumferential stepped portion is formed around the contact surface of a plurality of rollers, and the circumferential stepped portion is automatically fitted into the groove of the spacer cable. This is a device that reprocesses the concave grooves that have been deformed by twisting so that they can be forcibly corrected, so the spacer cable that has been twisted and extruded from the extruder can be quickly removed from the extruder as previously done. When compared with the solidified state,
Since there is no defect in the molded shape and the optical fiber spacer cable can be completely and easily inserted, the work efficiency can be improved and the effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an optical fiber spacer cable with a concave groove into which an optical fiber is inserted, Fig. 2 is a perspective view showing the optical fiber spacer cable in a twisted state, and Fig. 3a is an optical fiber spacer cable. Figure 4a is a cross-sectional view of a cable showing a specific example of a problem where the groove is enlarged; Figure 4b is a diagram showing a specific example of a problem where the groove is deformed or narrowed; Figure 5 is a diagram showing a specific example having a normal concave groove, FIG. FIG. 6 is a diagram showing a conceptual diagram of the entire processing process, and FIG. 6 is a processing apparatus according to the present invention, in which a is a front view, b is a side view partially shown in cross section, and FIG. 7 is a part of the processing apparatus. Diagram illustrating the machining state with only the roller taken out.
FIG. 8 is a sectional view showing how the spacer cable and roller are fitted during processing, and FIG. 9 is a perspective view showing a part of the completed optical fiber spacer cable. 1...Optical fiber spacer cable, 2...
...concave groove, 4...optical fiber, 10...conceptual diagram of the entire processing process, 11...guide base, 12...
...Bearing fixing plate, 13...Bearing, 16
... Roller, 16a ... Contact surface, 16b ... Circumferential step, 17 ... Squeezing die, 18 ... Guide base attachment part, 19 ... Squeezing hole, 20 ... Extruder,
21... Die head, 22... Base.

Claims (1)

[Scope of Claims] 1. A rotatable mouthpiece is installed at the extrusion port at the tip of a synthetic resin extruder, a convex portion is formed on the inner peripheral wall of the mouthpiece, and the resin is extruded at the same time as the mouthpiece is rotated. An optical fiber spacer cable processing device that forms a spirally curved concave groove on the spacer cable surface by coordinating the rotation of the base and the extrusion of the resin, has a cylindrical guide base and a bearing device inside it. The guide base includes a plurality of rollers which are rotatably installed and have circumferential steps formed around the circumference, and a drawing die having a drawing hole on one side of the guide base. , a light characterized in that the groove is formed into a predetermined shape by fitting a circumferential stepped portion of the roller into the groove of the spacer cable and then sequentially fitting it into the aperture hole. Fiber spacer cable processing equipment. 2. The optical fiber spacer cable processing apparatus according to claim 1, wherein the roller for processing the optical fiber spacer cable by passing it therethrough is configured to follow the movement of a groove formed in the spacer cable. 3. The optical fiber spacer cable according to claim 1, wherein the circumferential stepped portion formed on the roller is fitted into and pressed into a groove formed in the spacer cable to process the groove. processing equipment.