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AssigneeVyzkumny ustav bavlnarsky
InventorsStanislav Didek, Ludvik Fajt, Vaclav Rohlena, Jaromir Kasparek
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There is disclosed a method of and an apparatus for frictional spinning yarn on the open-end principle. Continuously supplied separated fibers are deposited onto a first, perforated frictional surface provided on a rotary carrier for conveying the fibers to the mouth of a wedge-like gap defined by said frictional surface and another, second, frictional surface provided on another rotary carrier. The second frictional surface moves relative to the first-named carrier, in the opposite direction, and with the first frictional surface twists the fibers in the mouth of said wedge-like gap to yarn, due to a contact with the two frictional surfaces. The yarn is withdrawn sidewards relative to the direction of movement of the frictional surfaces while preventing the twist propagation. In accordance with the invention one frictional surface is concave and the other is convex. This results in a number of advantages, including the elimination of undesirable slippage of the yarn in the yarn building region.
In a method of frictional spinning yarn based upon the open-end spinning principle, comprising depositing continuously supplied separated fibers onto a frictional surface provided on a rotary carrier and designed for conveying the fibers to the mouth of a wedge-like gap defined by said frictional surface and another frictional surface provided on another rotary carrier moving in said wedge-like gap in the opposite direction relative to the first frictional surface, twisting the fibers to yarn in the mouth of the said wedge-like gap, and withdrawing the yarn sidewards from the wedge-like gap while preventing the twist propagation, the improvement which comprises twisting the fibers between a convex and a concave frictional surface.
In an apparatus for the frictional spinning of yarn based upon the open-end spinning principle and including a mechanism for supplying separated fibers onto a frictional surface of a pair of frictional surfaces provided on respective rotary carriers and associated in contactless manner with each other so as to form a wedge-like gap in the mouth of which the fibers are twisted due to friction with the two frictional surfaces moving in mutually opposite directions in said wedge-like gap, and a mechanism for taking off the yarn sidewards from the wedge-like gap, said yarn taking-off mechanism being adapted to prevent any twist propagation, the improvement wherein one frictional surface is concave and the other frictional surface is convex relative to the yarn building region in the mouth of the wedge-like gap.
Dependencies are inferred from the claim text.