Textiles: spinning – twisting – and twining – Apparatus and processes – Receiving twist type
Patent
1987-06-11
1989-03-21
Watkins, Donald
Textiles: spinning, twisting, and twining
Apparatus and processes
Receiving twist type
D01H 1500
Patent
active
048132209
ABSTRACT:
Method and apparatus for splicing two textile yarn ends by untwisting the end portions of each to form a spread beard thereof, interpenetrating or intertwining the beards at both ends, and letting the twist accumulated at both ends progress towards the two mutually interwined or interpenetrated beards.
In the method, the untwisted end portions of both yarns are subjected to an axial traction force to set the beards of both yarn ends free and to separate and set the beard fibers substantially parallel with one another, while the beard bases are secured to retain the individual torsion or twist of the fibers, with the beards then being moved laterally to arrange the same adjacent to one another at zones of the beard bases, while the beards are simultaneously slided in longitudinal relative movement to one another.
In the apparatus according to the invention, yarn holding nips are axially movable, while beard support members have two complementary surfaces are movable about rotation axes and along paths from outer positions regarding the yarns, to positions in which the complementary surfaces are mutually adjacent. The apparatus comprises as well, holding members for the ends of the beards retained by the revolving nips, to preserve the twist thereof.
In a pneumatic embodiment, the twisting and untwisting of the yarn is accomplished by pneumatic chambers of substantially circular cross-section, and with a longitudinal gap for placing the yarn therein, along with a pair of tangentially-communicating ducts entering the chamber at diametrically opposed positions so that pressurized air injected alternately and in opposite directions through these ducts and into the chamber, generate within the chamber a swirl that causes the coaxially-arranged yarn therein to revolve in one direction for being twisted and in the opposite direction for becoming untwisted.
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patent: 4407117 (1983-10-01), Garnsworthy
patent: 4445318 (1984-05-01), Becker et al.
patent: 4494367 (1985-01-01), Badiali
patent: 4499715 (1985-02-01), Chardon et al.
patent: 4539802 (1985-09-01), Bertoli et al.
patent: 4637205 (1987-01-01), Badiali et al.
patent: 4720966 (1988-01-01), Speranzin et al.
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