Abstract: To develop the biaxial weft-inserted warp knitting machine and study the design method of the weft beating-up mechanism, the article analyzes the process of weft beating-up. It identifies three key positions for the weft beating-up needles: the end, front, and highest part. It also examines the displacements in the front and rear as well as the up and down motion, along with the corresponding spindle rotation angle requirements. A 2-dOF planar multi-bar weft beating-up mechanism was constructed by using a planar fivebar actuator and two groups of planar multi-bar mechanisms in series. The two input swing angles of the actuator were obtained by using the vector equation parameter method, and the dimensions of the first and second weft beating-up mechanisms were synthesized by using the graphic inversion method. The motion simulation of the designed weft beating-up mechanism was carried out, and the track of the weft beating-up needle, the coordinates of three key points and the corresponding spindle rotation angle were obtained. The displacement of the forward and backward and up and down were 19 mm and 7.7mm respectively. The errors of the coordinates of key points and spindle rotation angle were less than ±5%, which met the requirements of design and engineering application.

Key words: weft insertion composite; warp knitting machine; weft beating-up; planar multi-link mechanism