Abstract: This paper first introduces the structure and principle of electronic shogging system and selects non-stop modified trapezoidal acceleration curve which has good kinetic characteristic as the shogging curve. Then by analyzing this curve and in connection with the characteristics of shogging motion, the paper suggests increase the overlapping interval with pre-shogging. The theoretical calculation reaches the result that the pre-shogging angle is 8.4° on a Model RSE4-1 warp-knitting machine. By analyzing the factors affecting the pre-shogging, it draws the conclusion that the pre-shogging angle can be further increased by 7.8° theoretically. Finally, by carrying out experiment on a RSE4-1 warp-knitting machine which uses Mitsubishi J4 servo motor and non-stop modified trapezoidal acceleration curve, it obtains the result that the pre-shogging angle can be up to 16° when the main shaft operates at 1 300 r/min.

Key words: warp-knitting machine; electronic shogging motion; curve of shogging motion; optimization of shogging motion