FR2505545A1 - Multiconductor telephone cable forming machine - uses contra-rotating core supply and cable receiving drums with conductors wrapped round core and sheathing strip - Google Patents

Abstract

The machine has an unwinding drum carrying the core, the drum being carried on an axle fitted into a rotating yoke. The core is drawn off the drum by tracked rollers, and multiple conductors are drawn off bobbins and are wound round the core by the rotation of the receiving drum. The outer protective sheath is supplied through guides as a strip from a coil carried on a rotating table. As the receiving drum yoke rotates both conductors and sheath are tight wound round the core. The forward motion of the cable is aided by tracked rollers running on the section of cable having the conductors wound on but before the sheath is applied.

Description

Armor for electric cables
The present invention relates to an armoring device for electric cables, in particular for telephone cables and power cables.

 It is known that certain electrical cables, in particular telephone cables, generally include a core covered with wires or a mattress of wires which prove that they are made of paper, platinum material made of jute, polyisopropylene or others. The assembly is then covered with strips or a steel braid of steel for example.

 It is therefore necessary to wind these various components on the core of the cable by means of so-called armoring machines.

 The armourers currently in use are designed so as to drive the components around the core of the cable which is fixed. Consequently, if it is desired to operate at a high rate, it is necessary to reduce the mass of said components and to frequently stop the gunner to recharge it, hence appreciable losses of time. In addition, if one employs large capacity armor loaders, one cannot operate at high speed and moreover there are problems of balancing. Conventional machines are therefore relatively frozen in constitution due to the necessary importance of the various laying systems which are subjected to significant efforts.

 The present invention overcomes the drawbacks shown schematically in the foregoing.

 The subject of the invention is therefore an armor for the core of an electric cable, which must receive mechanical or electromagnetic protection, characterized in that it successively comprises a transmitting coil on which said core is stored, this coil being able to rotate freely around an axis disposed between the ends of a stirrup that can be rotated, means capable of driving said core in translation, a distributor capable of covering said core in the first place with a mattress of threads, a strip supply roll metal which can be wound on said core covered with said mattress of wires and finally a cable receiving coil provided with its covers, this coil being able to rotate freely around an axis disposed between the ends of a stirrup driven in rotation in the same direction than that of said transmitting coil and at a synchronous speed, the cable being thus driven both in a movement of rotation and translat ion.

Other characteristics and advantages of the invention emerge from the description which follows, given by way of purely illustrative example but in no way limiting, with reference to the appended drawing which schematically represents an embodiment of the invention.
In the appended figure, the reference 1 designates the cable core.

This core is stored on a transmitting coil 2 which can rotate freely around an axis 3 disposed between the ends of a stirrup 4 which can be rotated according to the arrow F1.

 The reference 5 designates a cable receiving coil once cocked, this coil being driven around an axis 6 disposed between the ends of a stirrup 7 which can be driven along the arrow F2 in the same direction as the stirrup 4 of the emitting coil 2 and at a synchronous speed.

 We also see in the figure pairs of rotating rollers 8 which can cause the cable 1 in translation along the arrow F3 therefore from the coil 2 to the coil 5.

 The cable 1 is therefore driven both by a rotational movement and a translational movement.

 The core 1 therefore passes successively between the first pair of rollers 8, then in a member 9 known as a distributor having the object of covering the core with a mattress of wires 10 without overlapping of the latter. These threads come from supply reels such as 11 and are made from jute, paper, polyisopropylene and others.

 The core 1 thus covered with the mattress of wires then passes between the second pair of rollers 8 then it receives at 12 a steel strip 13. As illustrated in the figure, this steel strip 13 comes from a roll of supply 14 arranged on a support 15 driven by a slow rotational movement in the direction of arrow F4 in order to avoid any torsional force on the strip 13. Similarly before winding on the cable, the strip 13 is engaged between two guides 16 whose purpose is to camber the strip if necessary and to feel its twist to control the rotation of the support 15 according to F4.

 Thus the guides 16 ensure the proper positioning of the strip 1.3 on the core of the cable and avoids any deformation by twisting of said strip.

 The cable is therefore at this time provided with its coatings and is stored on the reel 5.

 The device according to the invention makes it possible to operate at a rapid rate and to provide the cable with its coatings according to a tension which can be regulated with precision.

 Furthermore, it has a simple structure, a low cost price as well as great reliability.

 It finds advantageous applications in the manufacture of telephone cables.

 Of course, the invention is in no way limited to the embodiment described and shown which has been given only by way of example.

 In particular, it is possible without departing from the scope of the invention to make detailed modifications, to change certain provisions or to replace certain means by equivalent means.

Claims (4)

1 / Armeuse for core (1) of electric cable, characterized in that it comprises a transmitting coil (2) on which said core (1) is stored, this coil (2) being able to find freely around an axis ( 3) disposed between the ends of a stirrup (4) which can be rotated, means (8) capable of driving said core (1) in translation, a distributor (9) capable of covering said core (1) d 'a thread mattress. (10), a supply roll (14) of metallic strip (13) which can be wound on said core covered with said mattress of wires and finally a take-up reel (5) of the cable provided with its covers, this reel being able to rotate freely about an axis (6) disposed between the ends of a stirrup (7) rotated in the same direction as that of said emitting coil (2) and at a synchronous speed, the cable (1) being of the kind driven in both rotational and translational motion. 2 / armeuse according to claim 1, characterized in that said means capable of driving in translation said core (1) comprise pairs of rotary rollers (8) arranged on either side of said distributor (9). 3 / Armeuse according to one of claims 1 or 2, characterized in that said supply roller (14) is arranged on a support (15) driven in rotation to avoid twisting of the strip. 4 / armeuse according to claim 3, characterized in that before winding on the cable (1) said metal strip (13) is engaged between two guides (16) able to arrange it properly on the core of the cable and avoid any torsional deformation of said strip (13).