before install the tuck in device, we should know the operating principle,basicpoints ... scissor will cut off the weft yarn,finally the tuck in will tuck the selvedge edge.All operating process is finished ... device two pieces of scissor shaft drive,one tuck inshaft.2,the function of the scissor installation is every time when ... the scissor cut the weft yarn to finsh the tuck inprocess. tuck in device