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:
Oct. 13, 1987
Filed:
Aug. 14, 1986
Giovanni Nerli, Florence, IT;
Solitario Nesti, San Baronto, IT;
Francesco Grego, Portogruaro, IT;
Roberto Bottos, Pordenone, IT;
Francesco Ferro, Pordenone, IT;
501 Officine Savio S.p.A., Pordenone, IT;
Abstract
A friction open-end spinning process wherein the fibers of the feeding fiber sliver, once separated into discrete fibers, are sucked by a suction slot on a revolving twister element provided with a perforated surface, to feed the free end of the yarn being formed. The process is characterized in that the fibers are fed in a direction parallel to the free end of the yarn being formed, are kept under an adjustable tension throughout the twisting operation, and are subjected to a progressively increasing twist from the open end of the yarn being formed onwards. The device embodying the above process uses a revolving flat disc provided with perforations arranged according to an annulus as the twister element. This element cooperates with a sucking slot, the edge of which, consituting the yarn formation line, is positioned according to a chord of the disc.