Weft Insertion Condition Display for Loom Abnormality Diagnosis
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Solution Overview
Problem
Existing display methods for loom weft insertion conditions and stoppages do not effectively allow operators to determine the cause of abnormalities in weft arrival angle statistics, leading to prolonged identification of root causes, as they only show occurrence and type of failures without temporal context or differentiation between weft and warp yarn-related stoppages.
Innovation Solution
A weft-insertion-condition display method and apparatus that graphically displays weft arrival times and stoppages along a time axis, allowing for the calculation and visualization of statistics, including differentiating between stoppages caused by weft and warp yarn abnormalities, with an option for enlarged displays of specific time periods to identify causes of stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only occurrence and type of weft insertion failures are displayed, then the display is simple, but the cause of abnormality in statistics cannot be determined
Solution Approach 1:
The patent combines the display of weft insertion failure occurrence status with the display of stoppage occurrence status on the same time axis. This merging allows operators to correlate failures with stoppages, enabling determination of abnormality causes without requiring separate displays, thus improving ease of operation while maintaining reasonable display complexity
Solution Approach 2:
The patent adds a temporal dimension by displaying both failure occurrence and stoppage occurrence along the time axis. This dimensional approach allows operators to see the timing relationship between failures and stoppages, making it possible to determine causes of statistical abnormalities through temporal correlation analysis
2Measurement precision
If weft and warp yarn stoppages are displayed separately, then the cause identification is accurate, but the display complexity increases
Solution Approach 1:
The patent segments stoppages into different types (weft yarn stoppages and warp yarn stoppages) and displays them with different markers on the same time axis. This segmentation allows precise identification of cause types while using a unified display structure, achieving high measurement precision without excessive display complexity
Solution Approach 2:
The patent applies different display markers or attributes to different types of stoppages (weft vs. warp yarn) while using the same overall display framework. This local differentiation enables accurate cause identification without requiring completely separate display systems, thus balancing precision with structural simplicity
3Loss of time
If temporary abnormalities in statistics are displayed without temporal context, then the display is simple, but determining the cause takes a long time
Solution Approach 1:
The patent preliminarily organizes data by time and displays both failure occurrence and stoppage occurrence along the time axis before operators need to analyze abnormalities. This preliminary temporal organization allows operators to quickly locate and correlate events when abnormalities occur, significantly reducing the time needed for cause determination without requiring complex real-time analysis systems
Data Source
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AI summary
A loom in which a weft arrival time is detected each time a weft insertion operation is performed includes a weft-insertion-condition display apparatus (20). The weft-insertion-condition display apparatus (20) calculates statistics (average, maximum and minimum values, and standard deviation) regarding weft arrival times detected in each of predetermined sampling periods on the basis of the detected weft arrival times, stores the statistics that are sequentially calculated during a weaving operation in time series, and graphically displays the stored statistics in time series along a time axis. An occurrence status of stoppages of the loom that have occurred in each of the predetermined sampling periods is displayed such that the number of stoppages can be visually recognized along the same time axis as the time axis along which the statistics are graphically displayed.