It is completed by a weft pusher. The left and right hem bodies and the middle hem body (if there are two or more kinds of fabrics) are placed on both sides and in the middle of the loom respectively for complete use. Edge trimmer is used to cut the burr line on the edge of cloth. Mainly comprises an upper scissor assembly and a lower scissor assembly, and the distance between the upper scissor assembly and the lower scissor assembly is fixed.