Method and apparatus for twisting core strands

Details Method and apparatus for twisting core strands Method and apparatus for twisting core strands

1976-03-22

1977-07-05

Watkins, Donald

Textiles: spinning, twisting, and twining

Apparatus and processes

Covering or wrapping

57 34R, 57160, D02G 336

Patent

active

040331024

ABSTRACT:
The invention comprehends a method of twisting core strands, of the type comprising a sheath of fibres surrounding a central strand, a method in accordance with which a sliver of fibres is drawn between a point of entry of the said sliver and a pair of downstream drawing cylinders, a central strand is drawn under constant tension and is introduced without drawing into the sliver upstream of the said drawing cylinders, characterized in that a torsion in one sense and the other is conferred successively on the assembly constituted by the sliver of fibres and the central strand downstream of the said drawing cylinders.
The invention further comprehends apparatus for twisting a core strand of the type comprising a sheath of fibres surrounding a central strand, the said apparatus comprising a double sleeve drawing assembly comprising drawing cylinders for the drawing of at least one sliver of fibres and a device feeding under constant tension at least one central strand for introducing the said central strand into a sliver of fibres upstream of the drawing cylinders downstream of the drawing assembly, characterized in that, it comprises an auto-twisting assembly disposed downstream of the drawing assembly and comprising auto-twist cylinders for conferring a torsion successively in one sense and the other on the assembly constituted by the sliver of fibres and the central strand.

REFERENCES:
patent: 3255579 (1966-06-01), Price
patent: 3286449 (1966-11-01), Carroll
patent: 3377792 (1968-04-01), Walls et al.
patent: 3389545 (1968-06-01), Grunder et al.
patent: 3443370 (1969-05-01), Walls
patent: 3444677 (1969-05-01), Henry
patent: 3448571 (1969-06-01), Tsuzuki
patent: 3460338 (1969-08-01), Morrison
patent: 3738093 (1973-06-01), Ingham

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