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US 6,543,353 B1Granted
Method for monitoring a strip of fabric
AssigneeKoenig & Bauer Aktiengesellschaft
InventorsStefan Ohlhauser, Klaus-Dieter Pohl
Life of this patent
Estimating the term…
Abstract
The tension in a moving web of material is measuring using a measuring roller or cylinder. This tension is repeatedly compared to a threshold value. If the measured value deviates from the threshold value beyond a certain amount, this is used as an indication of web tear or breakage.
Claims10
A method for monitoring a moving web of material including:
- measuring a first web tension of said moving web of material at a first time;
- measuring a second web tension of said moving web of material at a second time subsequent to said first time;
- determining a difference between said first web tension and said second web tension;
- using said difference between said first web tension and said second web tension as a value of a change of said web tension per unit of time;
- providing a threshold value of said change of said web tension per unit of time;
- comparing said value of said change of said web tension per unit of time with said threshold value of said change of said web tension per unit of time;
- generating a signal when said value of said change of said web tension per unit of time exceeds said threshold value of said change of said web tension per unit of time;
- and
- determining the occurrence of a tear in said web of material from said generation of said signal.
6 more elements
The method of claim 12 further including determining said reference value (BS(n)) from defined production conditions.
Dependencies are inferred from the claim text.