Automatic threading false-twist spindle
AssigneesAsa S.A., Societa Nazionale Industria Applicazioni Viscosa S.p.A.
InventorsYves C. Derail, Jean-Claude Dupeuble
Life of this patent
Estimating the term…
Abstract
A false-twist texturing spindle in which the yarn to be twisted may be automatically threaded in the spindle through a retractable tube that is longitudinally movable between the rollers or discs of the spindle, on an axis coincident with the axis of thread travel. The retractable tube is movable from an inoperative spindle mode, allowing yarn threading, to an operative spindle mode after threading, for yarn twisting.
Claims14
In a false-twist texturing spindle having a support plate and a plurality of sets of rollers therein rotating about parallel axes normal to said support plate and overlapping with each other, a guide tube parallel to the axes of said rollers, opening just below the lowermost rollers and having its axis essentially at the median point of the configuration formed by said rollers, adjustment means allowing for displacement and positioning of said rollers, the improvement comprising a retractable tube, longitudinally movable through a support mounted above said rollers, on an axis coincident with said guide tube's axis and parallel with the axes of said rollers, from an inoperative mode adjacent the guide tube allowing yarn threading, to an operative mode after threading wherein the yarn passes through the interior of the retractable tube.
In a false twist texturing spindle unit of the type having at least three driven parallel axles symmetrically disposed about a median axis defining the central axis of the spindle, each said axle being provided with at least one rotationally symmetric frictional twisting disc whereby said discs overlap said central axis in an operative mode to supply twists to the yarns passing therealong and said axles being outwardly movable in a threading mode and said unit having means for supplying yarn to the spindle area and means for taking up yarn after the false twist operation, the improvement comprising a first fixed guide tube colinear with said central axis and providing a tubular path for introducing yarn into the spindle unit and terminating in a mouth portion proximate one end of said discs, a second linearly retractable guide tube colinear with said central axis and having a length at least as long as the portion of said axles incorporating said discs and being selectably positionable in either a retracted operating position wherein the yarn passes through the retractable tube after engagement with said discs or in a threading position wherein the terminal end portion of the retractable tube is moved into communication with the mouth of said fixed tube for establishing a substantially uninterrupted tubular path along the central axis of the unit, and means for propelling yarn through said first and second tubes during the threading mode.
A method of operating a false twist texturing spindle unit of the type having at least three overlapping rotary discs arranged on parallel axes disposed about a central axis defining the yarn path and having means for feeding yarn upwardly along the path from a lower guide and having means for taking up yarn above the discs, said method comprising the steps of displacing the discs outwardly to provide an unobstructed path along the central axis to the spindle unit, lowering a tubular member having a central opening aligned with the central axis from a position above the discs to a position where the lower end of such tubular member communicates with the lower guide, with the tubular member in the lowered position threading the spindle unit by passing thread from said lower guide upwardly through the tubular member and into operative association with the means for taking up the twisted yarn, after threading the unit retracting the tubular member along a linear path to a position above the discs, repositioning the discs in an operative overlapping relationship, and advancing yarn along the yarn path for imparting a false twist to such yarn and onward through the tubular member to said means for taking up.
Dependencies are inferred from the claim text.