Abstract: A knitting machine including a plurality of needles extended by two superimposed arms one of which, bearing a butt, is flexible, while the other one extends the support face of the needle. The upper arm is embedded by the action of a cam on the butts of a needle-latch and held in the embedded position by an electromagnetically controlled selection of a selector element in order to put the needle in the row being processed out of action, or to hold it temporarily in its embedded position by causing one or several press blocks to act on one or several tracks formed by the alignment of preselected butts in either position of the needle-latch in order to tuck stitches upon each pass and for each system of a knitting carriage.