| 摘要 |
For a multi-feed knitting machine or hosiery machine, the system of selection of the needles is equipped, per each thread feed, with at least a stationary electromagnetic actuator, suitable for acting by magnetic attraction on wire springs incorporated inside selection sinkers inserted inside the slots under the needles and the needle pushers. An extraction cam extracts the selection sinkers and the needle pushers coupled with them from the slots, in order to bring the heels of the needle pushers to interfere with a lifting cam. A loading cam brings the springs of the sinkers into contact with the face of the actuator, wherein they are retained by magnetic force. A narrow area of the face of the actuator can be de-magnetized by impulses emitted by an electronic control system. If this area is demagnetized, the springs of the sinkers are taken by a blanking-out cam, which pushes the sinkers into their relevant slots and the heels of the needle pushers out from the field of action of the lifting cam.
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