| 摘要 |
Disclosed is a sheet storing apparatus with a sheet tray which is movable up and down. When the tray moves down to a position which is specified according to the sheet size, fullness of the sheet tray is judged. The sheet storing apparatus has a sheet sensor for detecting a sheet on the tray and a top surface sensor for detecting the upper surface of the tray on which sheets are to be stacked or the top surface of a sheet stack on the tray being at a specified position. A specified time after the sheet sensor detects no sheets, the tray starts moving up, and the upward movement of the tray is stopped when the top surface sensor generates a detection signal. The sheet storing apparatus further has a paddle wheel for aligning sheets transported onto the tray. A specified time after the top surface sensor generates a detection signal in a situation that the sheet sensor detects a sheet, the tray starts moving down.
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