JPS6243285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a vertical sheathed cable.

Conventionally, to manufacture sheathed cables, a cable core is formed using a generally known assembly machine or twisting machine, the cable core is once wound up, and then the cable core is sent to an extrusion molding device that undergoes a separate process to synthesize the cable core around its outer periphery. BACKGROUND ART There is a widely known device that extrudes a sheath made of resin or the like and winds it up while cooling it.

A sheathed cable formed by this extrusion molding method is preferable in that the sheath is formed integrally with the cable core, and the original purpose of the sheath, which is the hermetic protection of the cable core, is almost completely achieved. However, there are various restrictions and unique working conditions attached to half-sided extrusion molding conditions, which require advanced technology and skill and cannot be easily increased in speed.The extrusion molding equipment itself is expensive and its huge amount of equipment is required. When space is also taken into consideration, there is a drawback that the cost is considerably high. In order to eliminate the above-mentioned drawbacks of the extrusion method, a method has been proposed in which a plastic tape is placed longitudinally along the cable core and both edges extending in the longitudinal direction are adhered to form a sheath. There is a serious flaw in the continuity of the work, as it is necessary to stop feeding the cable core and interrupt the sheath forming work every time the plastic tape is replaced.

The present invention eliminates the drawbacks of the prior art and provides a novel apparatus for manufacturing longitudinally sheathed plastic tape cables that can be operated continuously.

Prior to describing one embodiment of the present invention, a sheathed cable formed by the apparatus of the present invention will be described with reference to FIGS. 1 and 2. In the same figure, a cable core C is formed by twisting a plurality of insulated wires W together and then applying tape or thread holding winding 1 to the twisted wires. A plastic tape is placed lengthwise on top of the cable core C, and both edges extending in the longitudinal direction are butt-bonded L to form a sheath S. Of course, a chemical adhesive may be used for this butt bonding, but in the present invention, a thermal welding method is used.

Next, referring to FIG. 3, a device according to an embodiment of the present invention and its operation will be explained. In general, the reference numeral 10 indicates a suitable collecting device, twisting machine, etc., from which the cable core C, which has been pressed and wound 1 as shown in FIG. 1, is sent downstream.

What is designated as a whole by 2 is a feeding device for the plastic tape P. At least two plastic tape P delivery bobbins 21, 2
The plastic tape P fed out from the tape 2 is fed into the storage and feeding device 25 by a pair of feeding rolls 24. The storage and delivery device 25 is a type of box that accumulates and stores the plastic tape P sent in by the delivery roll 24 so as not to cause kinks or the like when sending it to the next process. Reference numeral 23 indicates an end welding device provided upstream of the feed roll 24, and this is used to attach the plastic tape fed from the other feed bobbin 22 to the end of the plastic tape P fed from one feed bobbin, for example, the feed bobbin 21. Used to weld and connect the starting ends of The storage and delivery device 25 is provided with a pair of back tension rolls 26, which are connected to the downstream longitudinal forming device 3.
This is to apply appropriate tension to the plastic tape P that is sent to the plastic tape P. As described above, new bobbins of plastic tape are connected and fed into the storage and delivery device 25 one after another, so a sufficient amount of plastic tape is always stored for the subsequent process, and there is no need to stop the process every time the bobbin is replaced. do not have.

The longitudinal forming device 3 is a device for vertically rolling the plastic tape P around the cable core C, and downstream of this device there are a heating device 41, a pressure roll device 51, a heating device 42, and pressure roll devices 52, 53.
are provided in this order. The heating devices 41 and 42 are, for example, hot air jet nozzles or hot ray condensing lenses, and serve to intensively heat and melt the butt joint L of the plastic tape shown in FIG. The side edges of the plastic tape heated and melted by the heating device 41 or 42 are pressed from both sides by a pair of pressure rolls 51A and 51B of the pressure roll 51, as further shown in FIG. is,
The molten side edges are welded together to complete the sheath S having an annular cross section as shown in FIG. The purpose of providing the heating device and the pressure roll device alternately is to ensure melting and pressure bonding of the side edges. As is clear from FIG. 4, the grooves of the pressure rolls 51A and 51B are of course selected in accordance with the outer diameter of the sheathed cable to be manufactured.

The sheath S formed through the steps described above is cooled and fixed by an air-cooled or water-cooled cooling device 6, and the sheathed cable is completed. As shown in the figure, the sheathed cable is taken off, for example, by a caterpillar type take-off device 7, and then taken up by a take-up device 8.

The present invention is applicable not only to sheathed cables, but also to twisting bare wires W ₀ and covering them with a sheath S ₀ as shown in FIGS. 1b and 2b. It can also be applied as is when forming a coating on one single conductor. In this case, as for the device, it goes without saying that the twisting and gathering machine described in the claims can be simply read as a core wire delivery device.

In place of the twisting and collecting machine 10 shown in FIG. 3, other types of twisting and collecting machines as shown in FIGS. 5 and 6 may be used with the same effect.

As can be seen from the detailed description above, according to the present invention, the sheath is formed by longitudinally running the plastic tape and adhering its side edges, so the process is easy and the cost is low. Since it is stored and then sent out, it is possible to continuously manufacture sheathed cables without interrupting the sheath forming process even when replacing the plastic tape bobbin.It can be used by connecting in tandem to any type of assembly or twisting machine. This has the advantage that the assembly (twisted wire) and sheath formation can be performed as a series of continuous operations.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a sheathed cable manufactured by the apparatus of the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is an overall view of an embodiment of the apparatus of the present invention. FIG. 4 is a side view of the pressure roll device, and FIGS. 5 and 6 are simplified side views showing other types of the twisting and gathering machine in FIG. 3. S... Sheath, C... Cable core, 2... Plastic tape feeding device, 3... Longitudinal forming device, 41, 42... Heating device, 51, 52, 53
... Pressing roll device, 6 ... Cooling device, 7 ... Take-up device, 8 ... Winding device.

Claims (1)

[Scope of Claims] 1 (a) A twisting and gathering machine 10 that continuously sends out cable cores; (b) At least two bobbins of plastic tape to serve as sheaths, and an end welding device 23 for the plastic tapes and Storage and delivery device 2
(c) a longitudinal forming device 3 for forming a sheath S by longitudinally aligning the plastic tape along the cable core; and (d) abutting portions of both side edges of the sheath. (e) at least one pair of pressure roll devices 51 for pressure-bonding the heated butt portions of the sheath;
52, 53; (f) a cooling device 6 that cools and fixes the sheath; (g) a take-up device 7 that takes up the sheathed cable produced in each of the above steps and a take-up device 8 that also takes up the sheath cable. , vertical sheathed cable manufacturing equipment.