US 5,323,599 A · Process and apparatus for producing hairiness in an open-end spinning yarn

Abstract

A process and apparatus for treating yarn formed on an open-end spinning machine of the type wherein the yarn is drawn from a rotor through a navel and through draw-off rolls is provided. The yarn is guided from the navel to the draw-off rolls in a path at least a portion of which is inclined with respect to the axis of the navel and a false twist is applied to the yarn during its travel in the inclined portion of the path between the navel and the draw-off rolls. The yarn is permitted to untwist between the false twist application and the draw-off rolls in response to the applied false twist. The untwisting of the yarn causes fiber ends on the surface of the yarn to project outwardly in a hairiness or fleeciness producing manner. The false twist applying element can include a member which produces a rotating air stream about the periphery of the traveling yarn. An initial false twist applying element or elements may be located obliquely at the change of direction location to impart an initial false twist to the yarn.

Claims9

Dependent claims

A process for treating yarn formed on an open-end spinning machine, the open-end spinning machine having a rotor with an annular fiber collecting groove having an axis, a navel defining an exit opening from the rotor and having an axis parallel to the axis of the annular fiber collecting groove, and draw-off rolls, the rotor being operable to entrain fibers collected in the annular fiber collecting groove in a yarn which is withdrawn from the rotor through the navel along the axis of the navel, comprising:

changing the direction of travel of the yarn from its direction of travel along the axis of the navel to a direction of travel inclined with respect to the axis of the navel;
guiding the yarn substantially uni-directionally along said inclined direction during travel of the yarn between the navel and the draw-off rolls;
imposing a cyclonic air flow on the yarn for applying a false twist to the yarn during travel of the yarn along said inclined direction as the yarn travels along said inclined direction between the navel and the draw-off rolls;
and
inducing the yarn to balloon and sufficiently untwist between the false twist application and the draw-off rolls to cause fiber ends on the surface of the yarn to project outwardly in a hairiness producing manner.

2 more elements

An apparatus for treating yarn formed in an open-end spinning machine, the open-end spinning machine including a rotor with an annular fiber collecting groove having an axis, a navel defining an exit opening from the rotor and having an axis parallel to the axis of the annular fiber collecting groove, and draw-off rolls, the rotor being operable to continuously entrain fibers collected in the annular fiber collecting groove in a yarn which is withdrawn from the rotor through the navel in a direction of travel along the axis of the navel, the apparatus comprising:

means forming a curved passageway for passage therethrough of the yarn, the curved passageway having an entrance aligned with the axis of the navel for passage of the yarn into the curved passageway as the yarn is withdrawn along the axis of the navel and at least one elongate projection extending along the curved passageway obliquely to the direction of travel of the yarn for changing the direction of travel of the yarn from the direction along the axis of the navel to a direction inclined with respect to the axis of the navel and for preventing the propagation therepast of twist imparted to the yarn by the rotor;
means for guiding the yarn to travel substantially uni-directionally in said inclined direction during travel of the yarn from said curved passageway to the draw-off rolls;
and
means for applying a false twist in the direction of the real twist to the yarn as the yarn is guided in said inclined direction, said false twist applying means including means for imposing a cyclonic air flow on the yarn, said false twist applying means being spaced from the draw-off rolls sufficiently to induce ballooning movement of the yarn and cause the yarn to sufficiently untwist between the means for applying a false twist and the draw-off rolls during the travel of the yarn substantially uni-directionally in said inclined direction to cause fiber ends on the surface of the yarn to project outwardly in a hairiness producing manner.

1 more element

Dependencies are inferred from the claim text.

Process and apparatus for producing hairiness in an open-end spinning yarn

Life of this patent

Process and apparatus for producing hairiness in an open-end spinning yarn

Life of this patent

Abstract

Claims9