Apparatus and method for imparting false twist to a yarn
AssigneeThe Hong Kong Polytechnic University
InventorsXiaoming Tao, Rong Yin
Life of this patent
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Abstract
An apparatus for imparting false twist to a staple yarn comprising a yarn guide for guiding a staple yarn along a path and a false twist device comprising a convex surface for engagement with a staple yarn so as to impart a force to the staple yarn when the staple yarn engages with and traverses the convex surface of the false twist device, and wherein the relative positioning between the yarn guide and the convex surface of the false twist device is adjustable such that, when a staple yarn is engaged with the convex surface of the false twist device and extends between the yarn guide and the false twist device, the amount of contact between the staple yarn and the convex surface of the false twist device can be controlled.
Claims13
An apparatus for imparting false twist to a yarn, comprising:
- a yarn guide for guiding yarn along a path;
- and
- a false twist device comprising a single convex surface for engagement with a yarn so as to impart a force to the yarn when the yarn engages with and traverses the single convex surface of the false twist device,
- wherein relative positioning between the yarn guide and the single convex surface of the false twist device is adjustable by a controller of the apparatus such that, when the yarn extends between the yarn guide and the false twist device during operation, the single convex surface of the false twist device is moveable between a first position in which said convex surface is engageable with the yarn, and a second position in which said convex surface is spaced apart from the yarn.
An apparatus for producing yarns, comprising:
- a yarn guide for guiding yarn along a path;
- a false twist device comprising a single convex surface for engagement with yarn so as to impart a force to the yarn when the yarn engages with and traverses the convex surface of the false twist device;
- and
- a first front drafting roller and a second front drafting roller together arranged to deliver the yarn to the yarn guide and false twist device, the first front drafting roller arranged beneath the second front drafting roller,
- wherein relative positioning between the yarn guide and the convex surface of the false twist device is adjustable by a controller of the apparatus such that, when the yarn extends between the yarn guide and the false twist device during operation, the single convex surface of the false twist device is moveable between a first position in which said convex surface is engageable with the yarn, and a second position in which said convex surface is spaced apart from the yarn.
Dependencies are inferred from the claim text.