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A textile ring frame drive requires

  • A.four-quadrant operation with frequent reversal
  • B.the largest possible acceleration at every change of speed
  • C.a smoothly rising speed profile as the bobbin fills
  • D.a single fixed speed throughout the whole doff

Answer: C

Correct answer: a smoothly rising speed profile as the bobbin fills

As the bobbin builds, the yarn must be delivered and wound at a rate that keeps the twist and the tension right, so the drive follows a profile rather than a fixed speed. Any discontinuity in that profile shows in the finished yarn, which is why smoothness matters as much as accuracy.

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