Patent ID: 7264238
Filing Date: 2007-09-04
Classification: B65H,G03G

Abstract:
1. A paper carrying tray moving method when paper is supplied to a paper feed apparatus which has a door adapted to be opened and closed as paper is supplied, successively feeds paper on a top portion of the paper carrying tray, and raises the tray as the paper is fed, said method comprising: sensing the open or closed state of the door; sensing whether paper is present at a first position which is lower than a paper feed position by a predetermined number of paper sheets; sensing whether paper is present at a second position which is lower than the first position by a predetermined number of paper sheets; lowering the paper carrying tray to a position where the presence of paper is not sensed at the second position if the opened state of the door is sensed; lowering the paper carrying tray to the position where the presence of paper is not sensed at the second position if the presence of paper is sensed at the first and second positions and the opened state of the door is sensed; and raising the paper carrying tray so that the uppermost one of paper sheets on the tray is situated in the paper feed position if the closed state of the door is sensed after the tray is lowered if the opened state of the door is sensed, or if the opened state of the door is sensed and the presence of paper is sensed at the first and second positions.