| 摘要 |
<p>A moving profile detector, particularly for detecting damaged knitting machine needles, whereby an electrode (10), mounted in a fixed position facing the path of the needles (3) on a rotary drum, is so biased and sized as to produce a sequence of electric discharges, the frequency and amplitude of which are proportional to the distance between the needle (3) and the electrode (10). The electric discharges are picked up by a sensor connected to the electrode (10) and designed to emit an electric discharge signal, which is supplied to and processed by a damaged needle detecting unit, for emitting an alarm output signal whenever, on account of a broken or damaged needle, no discharges are produced between the electrode and the needle, or the frequency or amplitude of the discharge differs from predetermined reference values.</p> |
