under the pile sinker 22 the lapping diagrams of fig3 through 5 are in the usual manner to be read from bottom to top the needles 2 of a stitch row are indicated by dots and the pile sinkers 22 by heavy lines the symbol 34 34 means the formation of a pile loop on the left side with the assistance of a pile sinker the symbol 34 x 34 indicates the formation of a pile loop on the right side by knock over of a needle 2 not provided with a stitch the designation 34 left pile loop 34 and 34 right pile loop 34 designates the pile loops on the left and the right side of the fabric respectively the designation 34 left pile thread 34 and 34 right pile thread 34 refers to the pile threads appropriate for the formation of the correspondingly named pile loops and these threads may be part of the same or different systems depending upon the specific embodiment in fig3 only guides bars l1 l2 and l3 are in operation the following displacement regimen applies ______________________________________pile sinker bar 21 0 0 0 1 1 1 l1 0 0 0 5 5 5 ground 1 empty 1 fulll2 0 2 2 3 4 3 loop 1 full 1 emptyl3 1 0 0 0 1 1 ground 1 full 1 empty______________________________________ thus l1 lays a first ground thread 12 in the form of a partial weft insert of threads of elastic material running over five needle spaces l3 lays a ground thread 14 as.