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Abstract

A method is suggested for operating a spinning-mill preparing machine (1) with a control apparatus (20), especially a draw frame, card or combing machine, in which a running fiber structure (FV) is conducted through a measuring area (26, 26',33) of a measuring apparatus (25, 25', 32) and a measuring signal (S(t); S.sub.a(t), S.sub.e(t)) is generated that represents the length-specific mass (M) of the fiber structure (FV) located in the measuring area (26, 26',33), in which a corrected measuring signal (SK(t); SK.sub.a(t), SK.sub.e(t)) is generated in that a correction value (K.sub.0, K.sub.1, K.sub.2; K.sub.a, K.sub.e) is added to the measuring signal (S(t); S.sub.a(t), S.sub.e(t)), and in which the determination of the correction value (K.sub.0, K.sub.1, K.sub.2; K.sub.a, K.sub.e) takes place by the following steps controlled by the control apparatus (20) of the spinning-mill preparing machine (1): The fiber structure (FV) is removed from the measuring area (26, 26',33) by pneumatic and/or mechanical means (27, 13,14; 28), Then, an empty measuring is performed, and The correction value (K.sub.0, K.sub.1, K.sub.2; K.sub.a, K.sub.e) is calculated in that the empty measuring value obtained in this manner (SL.sub.0, SL.sub.1, SL.sub.2) is subtracted from a theoretical value (SL.sub.Soll) of the measuring signal (S(t); S.sub.a(t), S.sub.e(t)) which value is predefined for an empty measuring.

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