TY - JFULL AU - Dariush Semnani and Mohammad Sheikhzadeh PY - 2007/6/ TI - Online Control of Knitted Fabric Quality: Loop Length Control T2 - International Journal of Computer and Information Engineering SP - 1224 EP - 1230 VL - 1 SN - 1307-6892 UR - https://publications.waset.org/pdf/14631 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 5, 2007 N2 - Circular knitting machine makes the fabric with more than two knitting tools. Variation of yarn tension between different knitting tools causes different loop length of stitches duration knitting process. In this research, a new intelligent method is applied to control loop length of stitches in various tools based on ideal shape of stitches and real angle of stitches direction while different loop length of stitches causes stitches deformation and deviation those of angle. To measure deviation of stitch direction against variation of tensions, image processing technique was applied to pictures of different fabrics with constant front light. After that, the rate of deformation is translated to needed compensation of loop length cam degree to cure stitches deformation. A fuzzy control algorithm was applied to loop length modification in knitting tools. The presented method was experienced for different knitted fabrics of various structures and yarns. The results show that presented method is useable for control of loop length variation between different knitting tools based on stitch deformation for various knitted fabrics with different fabric structures, densities and yarn types. ER -