CORRECT SIDE UP DETECTOR
Original Publication Date: 1998-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Xerox Disclosure Journal
Disclosed is a device and method for detecting blank sheets or imageless sheets in a document handler, for example, in scanning-printing and copying machines, and thereafter generating appropriate signals to the print engine, and or alternatively alerting an operator of the "blank" state so that remedial action may be implemented. The device and method comprise optically or electronically prescanning with a scanning device, original documents, for example, in a document handler, to detect any image or character matter to determine if the document is blank. If a blank state document is detected it may suggest an intentional blank sheet or an inadvertent "upside down" or wrong side condition, that is, where the image containing surface of the document is facing away from the imaging optics or electronics of the printing machine. In either situation, the detection system can signal the operator to invert specified sheets to effect proper imaging, or the printing hardware functions can be appropriately modified "on-the-fly" to efficiently process the blank sheet in a single rather than a multiple pass imaging cycle. In another embodiment, the correct side up detection system would further comprise automatic blank document inversion, for example, using an automatic document handler inverter, if the opposite face of the document is determined to possess imaging information.