Improved lower cam assembly structure of flat-knitting machine

The utility model relates to an improved lower triangle assembly structure of a flat knitting machine, which is arranged on a mechanical head of knitting machine. The utility model comprises a stitch rising triangle and a stitch returning triangle, wherein the stitch rising triangle is arranged in the middle point of a lower layer triangle group; the stitch returning triangle is arranged under the stitch rising triangle. The left and the right sides of the stitch rising triangle are respectively provided with a left stitch selecting triangle and a right stitch selecting triangle. Both of the left and the right stitch selecting triangles are arranged above the stitch returning triangle, and the left and the right stitch selecting triangles are simultaneously in a no-lifting, half-lifting or full-lifting state. By the mutual match of the various states of the stitch rising triangle and the left and the right stitch selecting triangles, the utility model can carry out single high stitch knitting, single low stitch knitting and select high-low stitch knitting. Therefore, the utility model can develop more knitting patterns for the knitting machine.