JPS5833642B2 - Tape vertical addition forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for longitudinally attaching a tape to a cable core, forming the tape into a pipe shape, and wrapping the cable core.

In the cable manufactured by the conventional method, as shown in FIG.
(longitudinally attached) wrapped and held down with tape 4.

In this case, the aggregated core 2 is in close contact with the tape 3 and is pressed, so that pressure (lateral pressure) is generated inside the aggregated core and between the core and the tape 4.

This pressure can affect the transmission characteristics of communication cables, especially when the aggregate core is a collection of optical fibers, such as in optical cables.The side pressure applied to the optical fibers increases the transmission loss of the optical fibers. This is a major cause of this.

Therefore, a cable structure is required in which the longitudinally formed tape 3 and the collective core 2 are not in close contact with each other, as shown in FIG.

The present invention provides an apparatus for manufacturing such a cable.

FIG. 3 shows a conventional manufacturing method.

The aggregated core 2 is guided to the tape former 5 together with the longitudinally attached tape 3, and the core is wrapped in a pipe shape by the tape.
A tape 4 is wound at the outlet of the cable 6 to produce a cable 6.

Therefore, in the cable 6, the core 2 and the longitudinally attached tape 3 are in close contact with each other as shown in the first figure.

In contrast, in the present invention, a guide pipe 7 is provided as shown in the fourth figure, and the outlet of the guide pipe protrudes from the outlet of the former 5, and the tape or thread 4 is roughly wound at this protrusion. Roughly wound tape (or thread) added to longitudinally attached tape 3
Since the pressure of cable core 2 is blocked by this protrusion,
does not receive any direct pressing force from the tape 3.

Therefore, it is possible to illegally obtain a cable having a gap between the core and the longitudinally attached tape as shown in the second figure.

Next, the apparatus of the present invention will be explained.

In FIG. 5, a guide pipe 7 is connected to a conical tape former 5 by a connecting member 8. In FIG.

This connecting body 8 should be provided in a portion that does not come into contact with the longitudinally attached tape.

This is always possible at a suitable location during the transition from tape to pipe.

Further, the outlet portion of the guide pipe 7 is connected to the forming machine 5 as described above.
It protrudes from the exit part of the thread, and the thread or tape is roughly wound at this protrusion.

FIG. 6 shows another embodiment in which a large number of small rollers 9 are arranged on the protrusion 7.

Since the cable is roughly wound in this area, a large stiffness occurs between the longitudinally attached tape and the guide pipe, but this is to alleviate this and allow the cable and tape to travel smoothly.

For the same purpose, this protrusion may be covered with a low mass index plastic such as a Teflon membrane or tape.

FIG. 7 shows a case where the tape former 5 has a shape like a rolled tape, but even in this case, the guide pipe 7
can be fixed by the connecting body 8 as shown in the figure.

According to the present invention, a guide pipe that is thicker than the cable assembly core is provided in a longitudinal tape forming machine, and the outlet part of the guide pipe projects from the outlet part of the tape forming machine. Since the resulting tape is loosely wound with thread or tape, a cable in which the cable assembly core is loosely wrapped with tape can be obtained.

In addition, the vertically attached tape should have good bending rigidity, and in this case, the tape after being formed into a pipe shape will try to open, but it will be blocked by the loosely wound thread (or tape), so the longitudinally attached tape will not be suitable. Tape can keep the pipe shape stable.

Furthermore, according to the tape longitudinally attached forming device for wrapping the cable assembly core of the present invention, the guide pipe is held in the tape forming machine and the longitudinally attached tape is formed on the guide pipe, so that the tip has a shape close to a perfect circle. This allows you to obtain high-quality communication cables.

By using the longitudinal tape forming apparatus according to the present invention, it is possible to obtain an optical cable with a particularly excellent structure.

[Brief explanation of the drawing]

Figure 1 is an external view of a cable assembly core in which tape is attached vertically to the cable assembly core to form a pipe using the conventional method, and tape or thread is loosely wound on top of the cable assembly core. An external view of a cable aggregate core in which tape or thread is loosely wound on the aggregate core with tape attached longitudinally to form a pipe, Figure 3 is an explanatory diagram of the conventional tape longitudinal attachment forming method, and Figure 4 is the present invention. FIGS. 5, 6, and 7 are explanatory diagrams showing the case of molding using a longitudinal tape forming apparatus according to the present invention, respectively. FIGS. In the figure, 1 is a core wire constituting the cable core, 2 is a collective core, 3 is a longitudinally attached tape, 4 is a tape or thread, 5 is a tape longitudinally attached former, 6 is a cable, 7 is a guide pipe,
Reference numeral 8 indicates a structure for connecting the tape longitudinal forming machine and the guide pipe, and 9 indicates a small roller.

Claims (1)

[Claims] 1. A longitudinal tape forming machine, a guide pipe that penetrates a cable assembly core provided in the forming machine in a partially connected structure, and a tape molded and output from the forming machine. The exit part of the guide pipe is made to protrude from the exit part of the forming machine, and the protruding part of the guide pipe is used to wrap the other tape over the longitudinally formed tape. Alternatively, a tape longitudinal application forming device is characterized in that the thread can be horizontally wound and pressed. 2. The longitudinal tape forming apparatus according to claim 1, characterized in that a large number of small rollers are arranged in parallel on the outer surface of the guide pipe protrusion. 3. The longitudinal tape forming apparatus according to claim 1, wherein the protruding portion of the guide pipe is coated with a material having a low coefficient of friction.