Leading Edge Detection of Magazines in Plastic Sleeves Via Retro-Reflex Sensors with Light Band

In order to protect magazines from contamination after printing, they are packed in transparent plastic films and then labeled for postal shipment. The address label must always be placed in the same position, even though the magazines are of different thicknesses and slip in the foil pouch. A retro-reflex sensor with light band reliably detects the leading edge of the film and thus triggers the exact positioning of the label – regardless of the shape, color, transparency or thickness of the object. Belt irregularities can be hidden.