Automatic Piecing and Yarn Joining in Rotor Spinning
topic
Automatic piecing units on rotor spinning machines perform rotor cleaning, fibre preparation, and yarn piecing in a 15 to 30 second sequence by cleaning the rotor groove with a brush or suction tool, feeding reduced-density fibre for the piecing process, and inserting the yarn end into the rotor at the correct angular position to create a piecing splice of defined mass that meets appearance and strength requirements.
Role
Maintains rotor spinning productivity after yarn breaks and scheduled rotor cleaning intervals without requiring operator piecing skill that was the primary quality variable in manual piecing, with automatic piecing consistency governing the quality of piecing joints in the yarn package whose appearance and strength must meet specifications to avoid weaving stops and fabric piecing defects.