摘要:
Flat filaments (12) are deflected by a system of sheaves (30, 32) to converge the filaments (12) to closing stations proximate to points at which the filaments are tangentially applied to helical surfaces of a central cylindrical core member (14). Successive sets of filament deflection sheaves (30, 32) stack the filaments into bundles which can be separated by spacer elements (24) which are applied to a smooth core or the filaments can be inserted into helical grooves in the core. Preferably, adjacent filaments forming each stack are guided to prevent contact until just prior to application in the core. The apparatus can be used to produce optical fiber cables, high pressure flexible composite pipes and the like. Different numbers of filament units can be stacked in one or more of the filament bundles.
摘要:
The described ribbon optical fibre cable comprises a cylindrical core (9) provided, on the outer surface thereof, with parallel grooves (10) extending in a helical manner along the cable axis, at least a pair of ribbons (1) being radially superposed within at least one of said grooves (10). Each ribbon (1a, 1b, 1c, 1d, 1e) comprises a plurality of optical fibres (2) each of which is covered with a primary layered coating (3), and a common coating (4) covers all the optical fibres of the ribbon. The primary coating (3) is formed with a first layer (5) directly in contact with the fibres (2) and a second layer (6) external to the first layer (5), the modulus of elasticity of said first layer (5) being lower than the modulus of elasticity of said second layer (6). Applied to each ribbon (1a, 1b, 1c, 1d, 1e) is a longitudinal tension greater than the longitudinal tension applied to the ribbon radially overlying the former. The process for making this ribbon optical fibre cable provides for the ribbons (1) being laid into the grooves by applying to each ribbon (1a, 1b, 1c, 1d, 1e) a longitudinal tension greater than the longitudinal tension applied to the ribbon radially superposed thereto.
摘要:
An aerial optical fibre cable comprises a glass-fibre-reinforced plastics core member (1) having a slot (2) with a zero lay angle accommodating loose-tubed optical fibres (3, 3A) and sheathed with a longitudinal tape (13) bound with a binder 915) and over-sheathed with a plastics extrusion (14). The cable is self-supporting and completely non-metallic and is suitable for telecommunications and data transmission services alongside overhead power transmission systems. An alternative embodiment (Figure 2) is not self-supporting but is similar in design and adapted for support from a support wire, and another embodiment has a rectangular slot housing one or more ribbon elements. The cable is simple and cheap to make.
摘要:
Le dispositif (5) est destiné à introduire des fibres optiques (F) dans des rainures hélicoïdales (13) d'un jonc (1) défilant axialement dans une ligne de câblage. Les fibres sont déroulées, sont tirées à travers un plateau tournant (44) et convergent suivant des génératrices d'un cône vers le dispositif. Afin d'éviter l'emploi de guide-fibre couplés directement en rotation avec le jonc, le dispositif comprend une filière (50) fixe en rotation et coaxiale au jonc pour rabattre les fibres dans les rainures du jonc, et des moyens , tels que deux vis sans fin (51) orthogonales au jonc, disposés à la suite de la filière suivant la direction de défilement (VD) du jonc et découplés mécaniquement du jonc pour pousser les fibres vers les fonds des rainures. Les vis sans fin contribuent également à aligner les fibres sortant du plateau avec les rainures du jonc, à l'intérieur de la filière.
摘要:
A method of producing an optical fiber cable. A plurality of grooves (2) are formed in an outer surface of a spacer (1). The grooves are formed continuously in the longitudinal direction by a die which surrounds the circumference of the spacer. The grooves extend, in a longitudinally changing direction. The optical fibers (7) are guided into the grooves through guide plates arranged to rotate in a reciprocating motion about the spacer. The position of the grooves is detected and converted into an electric signal. The operation of an actuator for driving the movement of the die and the guide plates is controlled on the basis of the electric signal thereby rotating the plates and the die in synchronism with displacement of said grooves.