| 摘要 |
The present invention relates to a device for monitoring, preferably arrival-monitoring, of the weft, for example the weft thread in a loom of substantially the type in which the weft is driven through the shed with the aid of a jet, preferably a gas jet, for example an air jet, and which has a reed with a longitudinal channel for the weft and an arm with the free end in a position where it is desirable to monitor the weft, the free end displaying at least one light source for illuminating the monitoring point and possibly the weft located there, and a number of light-sensitive elements, the light-sensitive elements (8, 9) each being aimed in their direction towards the channel (6) for sensing the light reflected from the illuminated parts, and each for generating an electric signal corresponding to the reflected light, and being connected to an evaluator circuit (Fig. 13) for adding the signals regardless of whether the weft occurring in the monitoring point entails an increase or reduction of the signals obtained from the light-sensitive elements (8, 9) for generating a signal corresponding to the absolute value of the two signals.
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