| 摘要 |
A pneumatic thread feeder in knitting machines or the like having at least one tube in which a passage is provided having an outlet to be directed towards the needle work region of a knitting machine; injection means for injecting air through the tube; means for actuating the injection means; and abutments that form a path for the approach of the thread to the inlet of the tube. The tube is served by a thread takeup element that is arc-shaped and is pivoted to a supporting structure about an axis located on the concave side of the body of the takeup element. The takeup element has, proximate to one of its ends, a passage for the thread, and is arranged so as to move transversely with respect to a portion of the path for the approach of the thread to the tube when it is turned about the axis. Actuation means act on the takeup element and cause its oscillation about the axis from a working position, in which its thread passage is located proximate to the path for the approach of the thread to the tube, to a takeup position, in which its thread passage is moved away from the approach path so as to lengthen the path followed by the thread, producing takeup of the thread inside the tube as a consequence of the clamping of the thread performed upstream of the takeup element.
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