Dynamic Tray Assignment RFID Initialization
Original Publication Date: 2007-May-24
Included in the Prior Art Database: 2007-May-24
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RFID Tags (RFID: Radio Frequency Identification) are used in industrial applications. In high throughput situations in which the Antenna/Detector writes or reads the RFID Tag (RFID-T), it has to be ensured that only the intended RFID-T is activated and errant Radio Frequency (RF) signals do not interact with any other RFID-T in the immediate vicinity. Especially, in a modern letter sorting machine a great number of containers (trays) transported on a conveyor has to be identified and labeled with the destination so that non-ambiguous reading and writing of the RFID-T has to be provided. The prior art solves the problem of labeling trays in industrial settings by printing labels. The labels are then affixed to the trays in a manual process. But this solution is slow in processing and error-prone if the wrong label is attached to a given tray. Expediting the proceedings the labels can be printed by a separate device which is attached to the machine exit conveyor. However, the human element consisting in attaching the printed labels is still error-prone. Further, the process of attaching the labels is replaced by robotics. Nevertheless, the use of robotics is expensive, slow and unreadable labels are difficult to handle. A further solution replaces the process of printing labels by affixing permanently a RFID-T with an integrated display to the tray (see Figure 1). Thus, the problem of non-ambiguous reading and writing of the RFID-T like described above has to be solved.