Method and apparatus for monitoring yarn tension
AssigneeBarmag AG
InventorsManfred Stuttem, Ludger A. Deters
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Abstract
In monitoring the yarn tension at each of a plurality of yarn processing stations, the mean value of the monitored tension is continuously determined at each station, and the differential between the monitored value and the mean value is also continuously determined. In addition, an overall mean value is generated which is representative of an average of the mean value signals from all of the individual stations, and the overall mean value is compared with the individual mean value of each station. In the event the mean value signal at a particular station differs from the overall mean value signal by more than a predetermined tolerance limit, an alarm signal is generated.
Claims17
A method of monitoring the tension of an advancing yarn at each of a plurality of monitored yarn processing stations of a yarn processing machine comprising the steps of
- continuously monitoring the value (U) of the tension of the advancing yarn at each of the yarn processing stations, while continuously determining the mean value (MU) of the monitored tension of each of the yarns,
- generating a group mean value signal (SM) representative of an average of the mean value signals (MU) of a group of said stations, and
- at each of said yarn processing stations on the machine, comparing the group mean value signal (SM) with the actual mean value signal (MU) of the position to generate a difference signal (D), and generating an alarm signal whenever the difference signal (D) exceeds a predetermined tolerance limit (LD).
A method of monitoring the tension of an advancing yarn at each of a group of monitored yarn processing stations of a yarn processing machine, comprising the steps of
- continuously monitoring the value (U) of the tension of the advancing yarn at each of the yarn processing stations, while continuously determining the mean value (MU) of the monitored tension of each of the yarns,
- generating a group mean value signal (SM) representative of an average of the mean value signals (MU) of all of said stations of said group, and
- generating an alarm signal at each of said yarn processing stations whenever the group mean value signal (SM) exceeds a predetermined tolerance limit (LD).
A method of monitoring the tension of an advancing yarn at each of a plurality of monitored yarn processing stations of a yarn processing machine, comprising the steps of
- continuously monitoring the value (U) of the tension of the advancing yarn at each of the yarn processing stations, while continuously determining the mean value (MU) of the monitored tension of each of the yarns,
- generating a group mean value signal (SM) representative of an average of the mean value signals (MU) of a group of said stations,
- setting a constant positive/negative tolerance limit (LD) relative to said group mean value signal to thereby define an upper limiting value (UMU) and a lower limiting value (LMU) for the mean value of each position, and
- at each of said yarn processing stations of the group, comparing the group mean value signal (SM) with the actual mean value signal (MU) of the position to generate a difference signal (D), and generating an alarm signal whenever the difference signal (D) exceeds said predetermined tolerance limit (LD).
A method of monitoring the tension of an advancing yarn at each of a plurality of monitored yarn processing stations of a yarn processing machine, comprising the steps of
- continuously monitoring the value (U) of the tension of the advancing yarn at each of the yarn processing stations, while continuously determining the mean value (MU) of the monitored tension of each of the yarns, and while also continuously determining the differential (DU) between the monitored value and the mean value for each of the yarns,
- generating a first alarm signal whenever the mean value (MU) for one of the advancing yarns leaves a predetermined tolerance range(UMU;LMU), or whenever the differential value (DU) for one of the advancing yarns leaves a second predetermined tolerance range (UDU;LDU),
- generating a group mean value signal (SM) representative of an average of the mean value signals (MU) of all of said stations on the machine, and
- at each of said yarn processing stations on the machine, comparing the group mean value signal (SM) with the actual mean value signal (MU) of the station to generate a difference signal (D), and generating a second alarm signal whenever the difference signal (D) exceeds a predetermined tolerance limit (LD).
A yarn processing machine having a plurality of stations for processing an advancing yarn, comprising
- sensor means at each of the yarn processing stations for continuously monitoring the value (U) of the tension of the advancing yarn,
- first circuit means at each of the yarn processing stations and operatively connected to said sensor means for continuously determining the mean value (MU) of the monitored tension of each of the yarns,
- second circuit group means for generating a mean value signal (SM) representative of an average of the mean value signals (MU) of all of said stations on the machine, and
- third circuit means at each of said yarn processing stations for comparing the group mean value signal (SM) with the actual mean value signal (MU) of the station to generate a difference signal (D), and for generating an alarm signal whenever the difference signal (D) exceeds a predetermined tolerance limit (LD).
Dependencies are inferred from the claim text.