Draw point control arrangement

摘要

An apparatus and method for processing a synthetic yarn includes at least a one sensor for generating a signal representative of the actual velocity of the yarn at a point intermediate an upstream and the downstream rolls. The temperature of the upstream roll in accordance with the variation between the actual velocity of the yarn at the measurement point and a predetermined reference velocity. A second sensor may be provided to generate a signal representative of the actual velocity of the yarn at a second point intermediate the rolls. The controller may regulate the temperature of the upstream roll in accordance with the variation between the actual velocity at each measurement point and a predetermined reference velocity for that measurement point. Alternatively, the controller may regulate the temperature of the upstream roll in accordance with a relationship (e.g., the ratio) between the actual velocities as compared to a predetermined reference relationship (as, the ratio) representative of the relationship of the velocities of the upstream and downstream rolls, and the variation between the actual and reference velocities at at least one of the measurement points.