Methods of and apparatus for controlling core-to-sheath length r

Details Methods of and apparatus for controlling core-to-sheath length r Methods of and apparatus for controlling core-to-sheath length r

1982-09-02

1984-05-08

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

Covering or wrapping

57 7, 57 9, 350 9623, G02B 516, G02B 514, H01B 1314

Patent

active

044466862

ABSTRACT:
In the manufacture of a lightguide fiber cable (21) in which a lightguide fiber core (32) is loosely disposed in a composite sheath 40 it is important to control the ratio of the lengths of the core and sheath. A core which is shorter than the sheath and which follows a shortened path on a reel may be unduly strained when the cable is installed in the field. This problem is overcome by coupling the core to the sheath by a system (25) which includes a constant speed linear capstan (146) and a relatively large variable speed sheave (150) that is positioned between the linear capstan and a takeup reel (154). The coupling of the core to the sheath is accomplished on the sheave after the sheath is elongated between the linear capstan and the sheave. The coupling and the elongation cooperate to compensate for the inherent shortfall in core length which otherwise would occur when the cable is wound on a reel. As a result, when tension forces that have been applied to the sheath are reduced, the sheath, which includes strength members having a relatively high modulus of elasticity, recovers to its original length and the ratio of the length of the core to that of the sheath becomes a predetermined value.

REFERENCES:
patent: 4129468 (1978-12-01), Knab
patent: 4153332 (1979-05-01), Longoni
patent: 4154049 (1979-05-01), King et al.
patent: 4195468 (1980-04-01), King et al.
patent: 4205899 (1980-06-01), King et al.
patent: 4241979 (1980-12-01), Gagen et al.
patent: 4248035 (1981-02-01), Skillen et al.
patent: 4388799 (1983-06-01), Vives

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