presser foot 43 in turn bears on the uppermost ply of the superposed plies 2 3 trapping the loop 8 it is this combined action of the pressing of the thread guide 50 and most especially of the presser foot 43 which ensures compaction of the superposed plies which then have a density of the portions of thread constituting them which is sufficient to retain the ply consolidating thread by means of friction since the presser foot 43 remains in contact with the uppermost ply as the needle 33 rises fig7 d the thread slides in the eye of the needle which remains in place now also in relation to fig6 the needle 33 is lowered by the cylinder actuator 54 which descends driving the plate 55 and therefore all the components fixed to said plate at the start of this descent that is to say before the needle 33 penetrates into the superposed plies 2 3 the thread f is held in place by the thread gripper 61 and the thread guide 50 also acting as a thread gripper and forms a loop fig7 a when the needle 33 penetrates into the plies 2 3 the thread guide 50 comes into contact with these plies immobilizing the spindle 57 and the thread f slides through the thread guide 50 while the previously formed loop of thread is pushed into the plies fig7 b when the needle 33 has.