Box detector in barcode environment

摘要: A system where boxes (12) move along a conveyor belt and bar code scanner reads codes (20) on the detects presence of box (with or without readable barcode), which facilitates establishing detector that leading edge box. The has scanning laser beam source (30) directs (32) at path boxes, sensor (44) reflections beam, so output from can be used by reader (52) to read codes. Instead setting up separate detector, reflection is delivered container detecting circuit (102) uses detect rapid increase in level (122) obtained when no present B3 commonly exceeded an ordinary surface, with constructed avoid false detections resulting black brown bars elements interspersed highly reflective space code.