Patent ID: 8038143

Claim:
A sheet delivery device comprising: an openable and closable manual paper feeder; an openable and closable paper catch tray; a first open/close detection unit to detect an opened/closed state of said manual paper feeder; a second open/close detection unit to detect an opened/closed state of said paper catch tray; and a control unit to issue an alert in response to simultaneous occurrences of both a closed state of the paper catch tray detected by the second open/close detection unit and an open state of the manual paper feeder detected by the first open/close detection unit; and an automatic paper catch tray open/close unit to automatically open/close the paper catch tray, the automatic paper catch tray open/close unit comprising a magnetic member disposed on one of the paper catch tray and a side plate near the paper catch tray, and a magnet plate provided on the other of the paper catch tray and a side plate near the paper catch tray, wherein the paper catch tray is normally held in the closed state by magnetic attraction of the magnetic member and magnet plate of the automatic paper catch tray open/close unit, and wherein when the manual paper feeder is opened, the automatic paper catch tray open/close unit automatically opens the paper catch tray by cancelling the magnetic attraction of the magnetic member and magnet plate, to release the clinging between the magnetic member and magnet plate.