| 摘要 |
<p>Electro-optical sensor for the detection of a filamentary material (31) passing through a guide-eye (29). Prior detection devices required the filament to be continuously within the focus of the sensor. Thus, making it necessary to either flood the filament detection area with light or force the filament into the detection area. The present invention requires only that the filament is within the focus of the sensor with a frequency high enough to ensure a timely response in the event of a break. Thus, it can use a low power solid state light source (11) and a sensor (5) with a narrow area of focus (15). </p> |
