| 摘要 |
A means for detecting the application of glue to a defined area of a moving box blank includes a capacitance device, one plate of which is formed by a sensing surface positioned adjacent the path of box blank movement, with the other plate being formed by the defined area of the box blank and the applied glue. There are means for applying an electric signal to the sensing surface and means for sensing variations in said signal caused by the presence or absence of glue. There is a control circuit for enabling the detector, which control circuit enables the detector after a glue application and after a period of delay consistent with movement of the box blank from the glue applicator to the detector.
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