Method and apparatus for false twisting yarn in opened spinners
OwnerTek T. Phoa, Joachim L/u/ nenschlossinventors
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Abstract
In open-end rotor spinning, imparting lesser false twist to the yarn being formed as it revolves through the yarn receiving zone and greater false twist as it revolves away from the zone. This is accomplished by different frictional resistance surface characteristics on the surface of a navel, or by shaping the surface for lesser extent of yarn contact in one surface portion and greater extent of yarn contact in another surface portion.
Claims35
A method of varying the false twist imparted to a yarn as it is being formed in an open-end rotor spinning device to minimize the unevenness imparted by wrapper yarns picked up as the yarn formation passes through the fiber receiving zone of the rotor, said method comprising reducing the false twist imparted to the yarn being formed as it passes through the fiber receiving zone and increasing the false twist imparted to the yarn being formed as it passes outside the fiber receiving zone.
An open-end rotor spinning device comprising a rotating hollow rotor having an interior circumferential groove formed therein, means for feeding fibers into said rotor for receipt in said rotor groove in a fiber receiving zone, a navel disposed within said hollow rotor, means for drawing-off yarn being formed from fibers in said rotor groove through said navel with a false twist being imparted thereto, and means for reducing the false twist imparted to the yarn being formed as it passes through said fiber receiving zone and increasing the false twist imparted to the yarn being formed as it passes outside the fiber receiving zone.
A navel for use in an open-end rotor spinning device comprising a circumferentially extending yarn engaging surface having circumferential portions with friction characteristics of lesser and greater frictional resistance to sliding of yarn thereover, said surface portion with greater frictional resistance being a roughened surface formed with a coating having partially embedded particles of a hard material.
A navel for use in an open-end rotor spinning device comprising a circumferentially extending yarn engaging surface having circumferential portions with friction characteristics of lesser and greater frictional resistance to sliding thereover, and a rotatable insert in the surface portion of lesser frictional resistance to provide rolling frictional resistance to the yarn sliding thereover.
A navel for use in an open-end rotor spinning device comprising a circumferentially extending yarn engaging surface having circumferential portions of lesser and greater extent of yarn contact.
Dependencies are inferred from the claim text.