Method of winding yarn on bobbin

In a yarn take-up device having a plurality of successive traverse cycles in each of which a continuous yarn is to be helically wound on a rotating bobbin and traversed first in one direction and thereafter in the opposite direction substantially parallel with the axis of rotation of the bobbin, a method of winding the yarn on the bobbin, comprising

• producing first signals effective to control the traverse velocity of the yarn to vary between predetermined minimum and maximum limits within a predetermined range and second signals effective to control the traverse distance of the yarn to vary between predetermined maximum and minimum limits within a predetermined range,
• at least during a limited time interval, controlling the traverse velocity to periodically vary between the predetermined minimum and maximum limits thereof on the basis of said first signals and controlling the traverse distance to periodically vary between the predetermined maximum and minimum limits thereof on the basis of said second signals,
• the cycles of periodic variation of the traverse velocity being respectively identical and synchronized with the cycles of periodic variation of the traverse distance,
• each of the traverse velocity and the traverse distance being controlled to vary throughout all of the traverse cycles,
• each of the minimum limits of the traverse velocity and each of the maximum limits of the traverse distance occurring substantially at the beginning of each of the cycles of periodic variation of the traverse velocity and traverse distance and each of the maximum limits of the traverse velocity and each of the minimum limits of the traverse distance occurring substantially simultaneously during each of the cycles of periodic variation of the traverse velocity and traverse distance,
• wherein the traverse distance of the yarn is controlled to periodically vary at a rate which increases progressively as the traverse distance decreases from each of the maximum limits to each of the minimum limits thereof during each of the cycles of periodic variation of the traverse distance and which decreases progressively as the traverse distance increases from each of the minimum limits to each of the maximum limits thereof during each of the cycles of periodic variation of the traverse distance.