This paper describes a computer-based system installed on industrial lockstitch and overlock stitch sewing machines. The system uses commercial hardware and developed software to acquire and analyze the collected signals of needle thread tension, presser foot displacement, presser foot pressure, and needle penetration/withdrawal forces. The effects of sewing speed, needle size, and the number of plies of a fabric sewn together on variations in measured needle penetration and withdrawal forces are in vestigated.
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