Here are some suggestions for making adjustments.

(1) If the bottom line of the edging stitch machine is not loose, you can try to increase the amount of the two looper lines.

(2) If it is a five-wire chain stitch machine, in the working state, turn the hand wheel, point the needle to the top dead center, adjust the wire cam so that the upper plane of the cam is parallel to the machine working surface, the purpose is Is to increase the amount of bottom line supply.