Method for running a ring-spinning machine and ring-spinning machine

摘要

A ring spinning machine has a perforated suction roller (19) to provide sliver compaction in the drafting system. The effectiveness of sliver compaction, and hence the yarn hairiness, can be adjusted, e.g. by moving the position of a cover (25) or controlling the airflow. The machine is operated to achieve a limiting value of yarn hairiness, e.g. as measured by the temperature of the ring (26). An independent claim is also included for a ring spinning machine equipped for maintaining a predetermined degree of hairiness in the yarn. The hairiness can be measured indirectly by its friction properties at the ring (26) and traveler (27). This alters the ring temperature (33), which is then fed to a controller (30). Alternatively the hairiness can be measured directly by a sensor. Only some of the spinning position need be equipped to indicate hairiness and the average values used by the controller (30). The compaction device can have replaceable inserts (21) and spacers, depending on the fineness of the yarn.