JPS5840494Y2 - Forming machine for attaching tape vertically to cable core - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a forming machine used for vertically attaching a tape to a cable core in manufacturing communication cables.

As a communication cable, one having a structure as shown in FIG. 1, for example, is generally known.

This involves covering the cable core 1 with a heat insulating tape 2 and a heat-adhesive tape 3 (attached vertically), and wrapping these tapes loosely with a thread 4 or the like so that the joints do not open. A communication cable is formed by extrusion coating.

Here, the heat insulating tape 2 inside the heat fusion tape 3 is
The cable core 1 is protected from the heat generated during extrusion molding of the protective sheath 5, and the outer heat-sealing tape 3 has the function of increasing the heat-sealing effect with the protective sheath 5.

Conventionally, as a forming machine used to vertically attach such tapes 2 and 3 to the cable core 1, the average diameter after the tapes are attached vertically is A cable with a fixed inner diameter slightly larger than the standard outer diameter was used.

For this reason, the tapes 2 and 3 attached vertically do not completely adhere to the cable core 1, and as a result, when the tapes 2 and 3 are roughly wound with the thread 4 etc. as described above, the tapes There was a phenomenon where the number of candidates was narrowed down to 2 and 3.

That is, from the ideal state where the tape seam is shown in FIG. In some cases, the condition was deviated from the actual condition.

For this reason, thermal fusion may occur between the insulation tapes 2 or between the insulation tape 2 and the protective sheath 5, causing fatal defects such as cracks in the protective sheath 5 when the cable is bent. was.

By the way, as a method to prevent such a problem, the tape width of the heat sealing tape 3 is widened so that the side edge 3a of the heat sealing tape 3 is aligned with the side edge 2a of the heat insulating tape 2 even if there is some deviation as described above.
Of course, it is possible to devise ways not to deviate from the
This method not only increases the manufacturing cost by increasing the tape width of the heat-sealing tape 3, but also increases the cost of the tape 3.
It is still impossible to avoid the phenomenon of being narrowed down.

This idea was made in consideration of the various problems mentioned above, and it is a relatively simple method that prevents the tape from being squeezed or the side edges of the tape coming off due to loose winding of thread, etc. The object of the present invention is to provide a forming machine used for vertically attaching a tape to a shaped cable core.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

FIG. 3 shows a process diagram for vertically attaching tape to the cable core 1, and 6 indicates a heat-insulating tape 2 and a heat-sealing tape 3 that are fed from tape feeders A and B, respectively, to the cable core 1 in a running state. A molding machine that attaches vertically,
7 is a thread winding machine for roughly winding the thread 4, etc. over the tapes 2 and 3 attached vertically to the cable core 1 so that the joints do not open; 8 is an extruder for extruding and covering the protective sheath 5; be.

By the way, the forming device 6 for vertically attaching the tapes 2 and 3 to the cable core 1 is constructed as shown in FIG. 4.

That is, the base ends 9a and 10a of the upper mold piece 9 and the lower mold piece 10, which are arranged opposite to each other, are connected to the hole 11a of the holder 11.
They are respectively pivoted by means such as removable pins 12 (only two are shown in the figure, but the same number are provided at corresponding positions), and their tips are The pins 9b and 10b are configured to be rotatable within a certain range using the pin 12 as a fulcrum, that is, to be able to move toward and away from each other.

In this embodiment, the upper mold piece 9 and the lower mold piece 10 are connected by a spring 13.13, and this spring 1
3.13, the tips 9b and 10b of the upper die piece 9 and the lower die strip 10 are urged toward each other.

Now, if the forming machine 6 for vertically attaching the tape to the cable core is constructed in this way, the upper mold piece 9. The inner surface of the tip of the lower mold piece 10 is always kept in close contact with the outer circumferential surface of the cable core 1 which is continuously passing through the space formed by the upper mold piece 9 and the lower mold piece 10 due to the spring force of the spring 13.13. To be more precise, the cable core 1 is maintained in a fixed state (through the tapes 2 and 3 attached vertically), so even if there is some variation in the outer diameter of the cable core 1 (increase or decrease in outer diameter), it will reliably follow this. It becomes like this.

In other words, the tapes 2 and 3 are always attached vertically to the outer peripheral surface of the cable core 1 in close contact.

Therefore, even if the cable core 1 with the tapes 2 and 3 attached longitudinally leaves the former 6 and the thread 4 is loosely wound by the thread winder 7, the tapes 2 and 3 will not be narrowed. Things will disappear.

Although not specifically explained in the explanation of this embodiment, the holder 11 to which the upper mold piece 9 and the lower mold piece 10 are attached can be disassembled into 92 pieces vertically in the axial direction. Assembly, removal work or upper mold piece9. Of course, it is also possible to make it easier to replace the lower mold piece 10.

As described above, this invention has a structure in which the proximal ends of the upper and lower mold pieces, which are arranged opposite to each other, are each pivoted, and the distal ends are biased toward each other by an elastic body such as a spring. , each tape attached vertically to the cable core is attached vertically to the outer circumferential surface of the cable core in a secure manner, and as a result, even if it is loosely wound with thread etc. from above, each tape will remain intact as before. The phenomena of tightening and side edges coming off no longer occur, and as a result, variations in the mechanical strength of the protective sheath that is subsequently extruded are eliminated, and fatal defects such as electric heating occur in the protective sheath as in the past. It has excellent advantages such as:

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the cable, and FIG. 2a is a partially cutaway perspective view of the cable. b is a schematic explanatory drawing, FIG. 3 is a process diagram shown to explain an embodiment of this invention, and FIG. 4 is a schematic perspective view of a molding machine according to an embodiment of this invention. 1... Cable core, 2... Heat insulation tape, 3... Heat fusion tape, 6... Forming machine, 9... Top Mold piece, 10...Lower mold piece,
9 a, 10 a...base end, 9b, 10b
...Tip, 12...Pin, 13,1
3... Spring.

Claims (1)

[Scope of utility model registration request] In a forming machine in which a tape is vertically attached to a cable core by an upper die piece and a lower die piece arranged opposite to each other, the upper die piece and the lower die piece are respectively pivoted at their proximal ends, and their tips are supported by a spring or the like. A forming device for vertically attaching a tape to a cable core, characterized in that the tape is urged in a direction closer to each other by an elastic body.