Abstract: A sliding base is guided for vertical movement on an upright of the traverse mechanism. It bears a camera having its lens directed along a horizontal axis toward a vertical bank of lights. A drum supported by uprights and driven rotatingly by a motor can move back and forth on rails, while the traversing carriage bearing vertical rolls guiding a cable can likewise move parallel to the axis of the drum in order to check and, if neccessary, modify the approach angle formed by the incoming cable about to be laid on the winding. The silhouette of the zone of the winding where the turns are laid down is formed on a receiving surface within the camera, this surface taking the form of a photodiode grid, the periodic scanning of which yields signals sensing the conditions under which the cable is being wound.

Abstract: The cylinder of the extruder comprises two parts separated by a heat-insulating gasket. In the wall of the upstream part there are ducts through which a cooling fluid flows. The inside surface of the upstream part is provided with parallel longitudinal grooves or spiralling grooves. The screw is divided into two zones, viz., a feed zone and a plasticizing zone which starts just after the heat-insulating gasket. The plasticizing zone includes an entry channel which gradually decreases in depth downstream and an exit channel which gradually increases in depth downstream. The mass of plastic material leaving the extruder is homogeneous and at a predetermined temperature with high output, as independently as possible of the material used.

Abstract: A vat under vacuum bears in its sidewall a sizing sleeve, the cylindrical downstream portion of which includes annular channels interconnected by distribution channels. Injection ducts leave the bottoms of the annular channels and open out in the inside surface of the sleeve. The interior of the sleeve communicates with the interior of the vat via rows of radial suction ducts. During operation, the injection ducts are supplied with water under pressure which forms a film between the outside of the tubing and the inside surface of the sleeve even when the tubing is pressed against that inside surface owing to the partial vacuum prevailing within the vat.

Abstract: The hopper of a screw communicates with a feed chamber situated upstream from the extruder cylinder. The substantially rectangular feed chamber is large enough so that the behavior of a mass of plastic material in its initial state, i.e., in the form of powder or pellets, is affected neither by the side-walls nor by the upper wall nor by the removable bottom of the chamber. Thus, in the case of pellets, the distance between any of those walls and the apex of the screw thread is appreciably greater than the average diameter of the pellets.

Abstract: A disk bearing a clamp for snagging the wire is supported by a bearing and attached by rods to a wire guard, the axial movements of which are controlled by a jack. The disk and guard are rotatingly driven via a pulley and a belt. Two driving mechanisms made up of couplings, driven pulleys, and driving pulleys make it possible to drive the guard and the disk via an auxiliary shaft either at a speed synchronized with that of the reel or at a slightly slower speed. The clamp then lags behind the reel and forms a loop with the leading end of the winding.

Abstract: A mixture of substances is fed to an extruder and, after being homogenized and liquefied, is extruded on an electric conductor or as a pipe. To meet electric cable specifications, the insulating material used is a polyolefin, such as polyethylene, cross-linking of which is brought about by the addition of a silane, a free-radical generator, and a silanol condensation catalyst. After extrusion, cross-linking takes place in the presence of moisture. To facilitate penetration of the moisture and accelerate cross-linking, an agent capable of reducing the rate of crystallization of the polymer, such as vinyl acetate, is used as a further additive.

Abstract: A double winding machine for winding wire on reels includes two reel supports with drive shafts. Each support is equipped with a snagging mechanism comprising a hook-bearing disk with hook, an uncoiling member, and a bearing for supporting the disk and the uncoiling member coaxially with the reel and for allowing relative displacement of the disk and uncoiling member between an initial and a displaced position. A disengageable coupler is provided to rotationally couple the disk, uncoiling member and reel. The coupler can be translationally disengaged. Brakes are provided for the disk to produce a lag between the disk and reel to lengthen the leading end of the wire. The relative displacement is performed with the lag, allowing the leading end to be retained in the hook and uncoiling member. The leading end is thus made accessible, even after winding is complete.

Abstract: A method of manufacturing insulated electric wire of the enamelled-wire type wherein an insulating sheath adhering to the wire is formed by extrusion of selected thermoplastics which are heated to a temperature above their melting-point, then pressed onto the wire while in a fluid state. The extrusion apparatus includes a gauging die with a compressing cone having an aperture angle of from 2.degree. to 20.degree., preferably 7.degree..

Abstract: A mixture of substances is fed to an extruder and, after being homogenized and liquefied, is extruded on an electric conductor or as a pipe. To meet electric cable specifications, the insulating material used is a polyolefin, such as polyethylene, cross-linking of which is brought about by the addition of a silane, a free-radical generator, and a silanol condensation catalyst. After extrusion, cross-linking takes place in the presence of moisture. To facilitate penetration of the moisture and accelerate cross-linking, an agent capable of reducing the rate of crystallization of the polymer, such as vinyl acetate, is used as a further additive.

Abstract: An improved screw-type extruder intended to increase the output obtainable from a machine of certain dimensions while maintaining a satisfactory quality of the material extruded. This result is obtained by providing in the homogenization zone a thread crossed by a multitude of narrow passages, and in the feed zone means for overfeeding the plasticizing zone. These overfeeding means may, for example, consist in providing in this zone a cylinder grooved longitudinally or spirally or a double-screw section producing a forced pushing of the material toward the plasticizing zone.

Abstract: An apparatus for manufacturing insulated electric wire of the enamelled-wire type wherein an insulating sheath adhering to the wire is formed by extrusion of selected thermoplastics which are heated to a temperature above their melting-point, then pressed onto the wire while in a fluid state. The extrusion apparatus includes a gauging die with a compressing cone having an aperture angle of from 2.degree. to 20.degree., preferably 7.degree..

Abstract: A one-screw extruder in which the mechanical thrust function is assigned to a first portion of the screw and of the cylinder, and in which the uniform heating of the material to be extruded is the function of a second portion, thus making it possible for each of the two portions to be specialized and to obtain a better performance of the extruder as a whole.

Abstract: An installation for treating metal wire, such as for coating a copper conductor, comprises at its upstream end a stationary wire-supply source having a reel support disposed within a loop-guard made of a gray iron or ductile cast-iron part in the form of a hollow body of revolution having an ogival profile. This part bears at its downstream end a conical tip defining the exit aperture for the wire. The inner surface of the loop-guard is machined by turning so as to be absolutely smooth and may also be subjected to a hardening treatment.

Abstract: A method of extruding a thin sheath of plastic material about electric wire, utilizing a plastic material capable of being shaped by extrusion after having been heated in a screw extruder, this material exhibiting the technical characteristics required for enamel-type insulation after cooling, without necessitating subsequent treatment. An extrusion material containing at least one partially crystalline thermoplastic polycondensate wherein the crystallites have a melting-point above 170.degree. C. answers these requirements.

Abstract: An installation is provided for extruding plastic material comprising a screw extruder having a cylinder provided with a hopper near the rearward end of said cylinder and with an extrusion head secured to the forward end of said cylinder, and at least one pump having a delivery pipe connected to at least one port disposed in the wall of said cylinder for delivering an additional fluid product to said extruder through said port or ports during the extrusion operation, the inner surface of said cylinder including a zone provided with grooves extending downstream starting from said hopper over a limited distance, said port or ports opening out into one or more of said grooved zone, said grooved zone being followed by a smooth zone, the inside diameter of which is less than the maximum diameter measured from the bottoms of said grooves, and wherein said screw extruder is of essentially uniform dimensions at the point of said zone and the portion of said screw extruder immediately upstream thereof.

Abstract: This document discloses apparatus for applying an insulating jacket to an advancing electrical conductor and includes a tubular enclosure for suspending said jacketed conductor in the presence of a treatment agent. The enclosure includes a stationary chamber and a telescoping tube to allow opening and closing of the upstream end of it. The telescoping tube is pressed axially against a pivotally supported extruder head.

Abstract: This invention is a screw-type extruder for plastics comprising a screw in a cylinder providing a feed zone, a plasticizing zone and a homogenization zone. The screw threads in the plasticizing zone are provided with marginal passageways so small as to provide heat exchange between the plastic and the screw, the latter being heated by friction.

Abstract: A double winding machine for winding metal wire and having an automatic wire-transfer device which includes a support, two pairs of coaxial reel-spindles borne by the support, and at least two reels. Each reel is provided with a wire-securing groove and is adapted to be held by a respective one of pairs of reel-spindles.The machine also includes two snagging members, each mounted on a respective one of the reel spindles of each of the pairs, and a deflection device operated at the time of transfer for changing the path of travel of the wire. The deflection device includes a wire-pushing mechanism adapted to engage the wire in the snagging member associated with an empty reel, a deflector adapted to cause relative displacement of the path of travel of the wire with respect to a full reel for engaging the wire in the securing groove of that reel, and a control for actuating the deflector just prior to the wire-pushing mechanism.

Abstract: A cooling installation for use in the production of insulated metal wire which installation includes a vat and means for guiding wire longitudinally within that vat and for ejecting cooling fluid against the wire, the installation also including a motor situated outside the vat and means for accumulating the wire and means for pulling the wire, both said means being disposed within the vat. More particularly the pulling means is disposed between two portions of the accumulating means, one portion of the accumulating means adapted to accumulate a constant length of wire and the other adapted to accumulate a variable length of wire.

Abstract: This invention relates to a device for regulating the water level in apparatus for treating an insulated electrical conductor, which device comprises two or more gates actuated by a control signal for filling and emptying the apparatus, a first control circuit having a broad range of adjustment, a second control circuit having a narrow range of adjustment, and an inverter, each circuit in turn comprising a first transmitter for producing a measuring signal, a second transmitter for transmitting a reference signal, and a comparator for producing a control signal and transmitting same to the inverter, the inverter supplying the control signal from the comparator of the first or of the second circuit to the gates.