On-loom fabric inspection system and method
On-loom fabric inspection system to identify weaving faults during the process of fabric manufacture thereby enabling early detection or prevention of fabric defects. A method for continuous monitoring of woven textiles during production and an objective standard for quality control of such fabrics.
1. An on-loom fabric inspection system comprising:
at least one imaging device configured to collect images of at least one section of a weaving area of a loom and to detect at least one fault in said weaving area;
wherein said section of the weaving area comprises a shed region, a woven fabric region and a fell region, said fell region being a section of the weaving area where a reed strikes a weft yarn along a fell line during operation of said loom and;
a controller operable to respond to said detection of said at least one fault in said weaving area,
wherein said controller is operable to assign a quality index to a batch of woven fabric, said quality index being at least partially based upon deviation of weft-spacing in the fell region from a desired weft-spacing function.
2. The system of claim 1 further comprising at least one image processor configured to receive data pertaining to said images and to identify irregularities in said data.
3. The system of claim 1 wherein said imaging device comprises a camera.
4. The system of claim 1 wherein said imaging device is configured to image a plurality of weft yarns in the fell region.
5. The system of claim 4 further comprising an image processor operable to measure weft-spacing.
6. The system of claim 1 further comprising an image processor operable to detect irregularities in image data indicating the occurrence of weaving faults.
7. The system of claim 6 wherein said weaving faults are selected from a group consisting of: slubs, holes, missing yarns, yarn variation, end out, soiled yarns, wrong yarn faults, oil spots, loom-stop marks, thin place, smash marks, open reed, mixed filling, mixed end, knots, jerk-in, dropped picks, drawbacks, burl marks and combinations thereof.
8. The system of claim 1 , wherein said controller is operable to stop the loom upon detection of critical weaving faults.
9. The system of claim 1 , wherein said controller is operable to adjust the loom settings to correct for weaving faults.
10. The system of claim 2 wherein said image processor is configured to segment a frame of said image data and to analyze each segment separately.
11. The system of claim 10 wherein each segment is analyzed at a different rate.
12. The system of claim 10 wherein at least one segment shows the shed region.
13. The system of claim 10 wherein at least one segment shows the fell region.
14. The system of claim 10 wherein at least one segment shows a newly woven fabric region.
15. A method for inspecting woven fabric comprising:
providing at least one imaging device configured to collect images of at least one section of a weaving area of a loom said section of the weaving area comprising a shed region, a woven fabric region and a fell region, said fell region being a section of the weaving area where a reed strikes a weft yarn along a fell line during operation of said loom;
said imaging device collecting image data from said weaving area;
said imaging device transferring said image data to an image processor;
said image processor analyzing said image data for irregularities indicative of weaving faults, wherein said analyzing includes comparing deviation of weft-spacing in the fell region from a desired weft-spacing function; and
recording said weaving faults.
16. The method of claim 15 further comprising a step of adjusting said loom to correct said weaving faults.
17. The method of claim 15 further providing a quality index for a batch of woven fabric.