Rieter

Completion of doffing

Index

During automatic doffing with old doffing systems the process is interrupted once or twice for tours of inspection. Personnel need to check that the process is proceeding correctly, and especially to ensure that tubes have been fitted everywhere and are not jammed. These tours of inspection are no longer necessary on good modern doffing systems, since each spinning position is continuously monitored during doffing, and collisions between tubes and spindles or cops are therefore impossible. After doffing is completed, the doffer returns to its idle position below the spindles. At the same time the ring rail rises to the piecing position, the balloon checking rings move upward and the yarn guide flaps tilt downward. The machine starts. The conveyor belt moves the doffed cops toward the end of the machine, where they are discharged into transport trolleys or individually transferred directly to the winder. Duration of automatic doffing can be as short as 2 minutes.