Device for controlling the looper thread of a double chainstitch
Device for forming a double chain stitch in a sewing machine
Device for tilting sewing machine hooks to facilitate threading
Double chain stitch sewing machine having a looper and a looper
Double pointed looper actuating mechanism for chain stitch sewin
Double-thread chain-stitch sewing machine
Driving mechanism for the upper looper in overlock sewing machin
Dry sewing machine including loop spreader