12 is a pusher 14 with a tapering top end to act on the bottom end of the oscillating jack 12 to push the bottom butt 12a thereof out in a radial centrifugal direction immediately below its own tapering top end the pusher 14 has a butt 14a which is able first to push out by means of a chamfer 14y and then to push up the oscillating jack 12 when said pusher is lifted the pusher 14 also has a bottom butt 14b for the purposes indicated below also contained in each of the tricks of the needle cylinder 1 is an oscillating selector 16 lying against the outward side of the pusher 14 this oscillating selector 16 is held by a cam box 18 in its respective trick in such a way that it can oscillate about a point internal to said box the oscillating selector 16 has a series of selection butts 16a over a multiplicity of rows a short upper pushing butt 16b for withdrawal and a lifting butt 16c near the bottom end of said selector 16 in order to interact by its lower inclined edge with the corresponding edge of a lifting cam 20 which is further described below and runs round the needle cylinder interacting at each height with the selection butts 16a are corresponding pushing plates in the form of oscillating levers 22a1 22a2 22a3 22a4 such as that shown at 22 in fig2.