The FA-II system employs a laser sensor mounted to the traverse. The sensor continually references the distance from the spool core up to the highest point that wire or other material will be spooled. When the sensor detects the spool flange, the reading is not within the acceptable variance and a signal is sent to a pneumatic cylinder which reverses the traverse.
This arrangement also enables FA-II use with both straight and tapered flanges thereby expanding the system’s application. Because the distance from the sensor to the sloping surface of the tapered flange is less than the master reference point, reversal is not triggered until the spool flange edge is detected.