on the front y yarn on the reverse side in one semi turn or y yarn and c yarn on the front x yarn on the reverse side in other semi turn this kind of yarn guiding mouth can also be used to guide the yarn through one guiding hole or two guiding holes in which according to the following four conditions to thread yarn for wearing 1 c yarn 2 x yarn and y yarn 3 c yarn and x yarn or c yarn and y yarn 4 x yarn y yarn and c yarn vi as shown in fig1 compared with the third kind of yarn guiding mouth the sixth kind of yarn guiding mouth with replenishment function structure is as follows the yarn guiding mouth with replenishment function includes the fixed bar 1 the replenishing yarn guiding mouth 6 x yarn guiding hole 16 c yarn guiding hole 17 and y yarn guiding hole 18 the replenishing yarn guiding mouth 6 has the main yarn guiding mouth 5 having three parallel positioned guiding holes x yarn guiding hole 16 c yarn guiding hole 17 and y yarn guiding hole 18 there is a gap between the main yarn guiding mouth 5 and the replenishing yarn guiding mouth 6 namely a replenishing yarn hole 7.