Method and apparatus for stretching at least one fiber sliver.

摘要

A method for stretching at least one fiber sliver (FB) by means of a controlled spinning preparation machine, in particular a carding or drafting, presented which successively arranged delay roller pairs (5, 6, 7), wherein the cross-section or the mass or density of the at least one sliver (FB) or the variation of these measured values ​​upstream of the roller pairs (5, 6, 7) is measured and based on the corresponding measuring signals the rotational speed of at least one roller (5a) of a first pair of rollers (5) via a first control circuit (30) and the rotational speed of at least one roller (6a) can be controlled of a second roller pair (6) via a second control loop (35). The method is characterized in that at least some of the measurement signals are so divided into signals with partial amplitudes, which form the overall amplitude of the respective measurement signal in the sum that band fluctuations to a partial amplitude in the first control circuit (30) and another part amplitude in the second loop (35) are compensated. Likewise a corresponding device is proposed.