The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 1977
Filed:
Mar. 22, 1976
Michel E Vanhelle, Wattrelos, FR;
Centre Technique Industriel dit: Institut Textile de France, Boulogne-sur-Seine, FR;
Etablissement Public dit: Agence Nationale de Valorisation, Neuilly-sur-Seine, FR;
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.