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US 4,396,040 AGranted
Quality monitoring system for looms
AssigneeLeesona Corporation
InventorCharles W. Brouwer
Life of this patent
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AssigneeLeesona Corporation
InventorCharles W. Brouwer
Estimating the term…
A quality monitoring system for looms is disclosed. The system includes a plurality of signal producing units disposed at various loci on the loom. These units operate to detect faults in the warp or filling yarns being woven into the fabric. Detection of such faults produce signals which are registered and accumulated in a counter. Signals provided from different sources can be weighted at different values so that a fault from one source can excite the counter to a different level than a fault from another source The accumulation of these values thus provides a quality point index indicative of the probable quality of the fabric being woven. Since a useful application of the quality point index is to assess this index or value in terms of faults in the woven fabric per unit length of loom operating time, or unit length of fabric woven, a divider circuit is provided to divide either of the aforementioned units by faults detected. A display is provided as a visual readout for the quality point index per unit length after this division step is completed.
A quality control system for determining probable quality of fabric produced on a loom which includes means for advancing a sheet of warp yarns, means for inserting filling yarn and stop means for halting operation of the loom responsive to defective conditions in said warp yarns or filling yarns comprising;
The method of establishing from loom operating history a running quality control index showing operational quality of a loom producing fabric from weft and warp yarns and provided with stop means for arresting operation of said loom comprising the steps of, sensing a plurality of different conditions in at least one of said weft and warp yarns, deriving from the signal conditions a set of weighted output signals indicating minor and major defects, which will reduce the quality of output fabric, providing a further sensor in the loom indicating the units of length of fabric being produced by said loom, and calculating from the weighted output the running quality index representative of the number of probable defects per linear measure of fabric output being produced thereby to avoid the necessity of fabric inspection to determine quality.
Dependencies are inferred from the claim text.