Abstract: To meet the changing needs of product upgrading,a technological modification was performed on the present Malimo stitch-knitting machine imported from German by installing a parallel double-crank mechanism on the weft insertion device so that the residence time of the weft insertion device was prolonged.PLC controlled pneumatic executing mode was affected by means of the electromechanical integration modification.Thus,the weft insertion devices operated accurately,coordinately and reliably,meeting the requirements of parallel weft insertion by the least possible modification of the original equipment.