Patent ID: 7397576
Filing Date: 2008-07-08
Classification: B65H,G03G

Abstract:
1. A method of recognizing trays in a printer having a main frame, the method comprising: transmitting a recognition signal to a plurality of trays from the main frame; controlling the trays to read the recognition signal and recognize unique codes which correspond to the trays in response to the recognition signal; and recognizing the unique codes of the trays, which are received by the main frame from the trays; wherein the trays comprise a first tray and a second tray, and the modifying of the recognition signal comprises: transmitting the recognition signal recognized by the first tray to the second tray; and modifying the recognition signal when the recognition signal is transmitted to the second tray from the first tray; wherein the recognition signal comprises a first recognition signal and a second recognition signal transmitted through two lines, and the method comprises: modifying the first recognition signal by inverting the first recognition signal when the first recognition signal recognized by the first tray is transmitted to the second tray; and dividing the second recognition signal when the second recognition signal recognized by the first tray is transmitted to the second tray, one of the two lines being grounded while the other line extended from the first tray is connected to the second tray.