Sheet feeding device and image forming apparatus

摘要

A sheet feeding device includes a sheet storage unit, a driving unit, a first detection unit, a second detection unit, and a control unit. The sheet storage unit includes a tray on which a sheet bundle including a plurality of sheets is to be stacked. The driving unit lifts up the tray. The first detection unit detects, at a predetermined position, a top surface of the sheet bundle stacked on the tray and lifted up. The second detection unit detects whether a sheet is stacked on the tray. The control unit controls, while the first detection unit has not detected the top surface of the sheet bundle, the driving unit to lift up the tray at a first speed until the second detection unit detects the sheet, and to lift up the tray at a second speed lower than the first speed after the second detection unit detects the sheet.

主权项

1. A sheet feeding device comprising:
a sheet storage unit having a tray on which a sheet bundle including a plurality of sheets is to be stacked; a driving unit configured to lift up the tray; a first detection unit configured to detect, at a predetermined position, a top surface of the sheet bundle stacked on the tray lifted up by the driving unit; a second detection unit configured to detect whether a sheet is stacked on the tray; a control unit configured to continuously drive the driving unit so that the tray is to be lifted up continuously in a first speed until the second detection unit detects the sheet while the first detection unit has not detected the top surface of the sheet bundle, and continuously drive the driving unit so that, after the second detection unit detects the sheet, the tray is to be lifted up continuously in a second speed that is slower than the first speed; and a display unit configured to display, if the second detection unit detects that no sheet is stacked on the tray, a message indicating that there is no sheet on the tray.