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The Auxillary Winding Devices

 

  • Traverse varying devices :-.
    • At the reversal points of the traverse i.E. At the edges of the package , a short dwell arises in the movement of the thread guide owing to the deceleration & subsequent reverse acceleration required here.
    •  More yarn is wound up at these points than at other points along the package length. This leads to considerable accumulations of material with the following results:-.
      • Too high a density;
      • A high yarn stress ;
      • Thrown ends {loops of yarn projecting from the package ends}; &.
      • Variability of dye uptake in packages for package - dyeing.
    •  Traverse-varying devices are designed to shift the reversal points of the yarn through a very short distance so as to prevent improper package
  • Pattern-breaking devices :-.
    •  When the ratio of traverse frequency to the rate of revolution of the package , becomes  1:1 ,1:2, 1:3,etc. , The turns  of a new layer are deposited exactly on the top of the turns of the preceding layer, & this process  repeats  itself for several successive layers .
    • This generates uniformly crossing rhomboidal ridges ,
    • The so-called pattern windings or or pattern zones.
    • They reduce the take up capacity of the package & make unwinding difficult & are therefore to be avoided at all costs.
    •  The pattern breaking devices ensure that the traverse speed is not uniform but is subjected to variations.
  • Yarn waxing devices : -.
    • In the production of knitted goods in particular , where the yarn is strongly bent around the needles , rough yarns can cause disturbances , broken threads  & a high degree of wear .
    •  In order to improve the running performance ,knitting yarns have always been waxed , & the rotor spinning m/c now enables this to be done directly at the spinning stage.
    • The waxing device is arranged in between the withdrawl rolls & the package so that small particles of lubricant can settle on the yarn as it passes over a body of wax.
    • These particles are rubbed off as the yarn is strongly bent at the needles of the knitting machine ,& they then ensure good running properties.

 



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