SHEET FEEDING DEVICE AND IMAGE FORMING APPARATUS

摘要

A sheet feeding device includes a sheet storage unit, a stacking unit, a raising unit, a sheet detection unit, an attachment detection unit, and a control unit. The sheet storage unit may be attached to and drawn out of an apparatus main body. The stacking unit is raised by the raising unit and is lowered when the sheet storage unit is drawn out. The attachment detection unit detects attachment of the sheet storage unit to the apparatus main body. The control unit determines whether an amount of sheets stacked on the stacking unit exceeds a predetermined amount based on detection results. If the sheet detection unit continues to detect sheets when the sheet storage unit goes from attached, to not attached, to attached to the apparatus main body, the control unit determines that the amount of sheets stacked on the stacking unit does not exceed the predetermined amount.

主权项

1. A sheet feeding device configured to feed sheets, the sheet feeding device comprising:
a sheet storage unit configured to store sheets, wherein the sheet storage unit is configured to be attached to and drawn out of an apparatus main body; a stacking unit provided in the sheet storage unit and configured to allow sheets to be stacked thereon; a raising unit configured to raise the stacking unit, wherein the stacking unit is lowered when the sheet storage unit is drawn out of the apparatus main body; a sheet detection unit provided in the apparatus main body and configured to detect a sheet, the sheet detection unit detecting a sheet stacked on the stacking unit when the stacking unit is raised by the raising unit; an attachment detection unit configured to detect attachment of the sheet storage unit to the apparatus main body; and a control unit configured to determine whether an amount of sheets stacked on the stacking unit exceeds a predetermined amount based on results of detection by the sheet detection unit and the attachment detection unit, wherein the control unit determines that the amount of sheets stacked on the stacking unit does not exceed the predetermined amount when the sheet detection unit continues to detect sheets in a series of processes in which the result of detection by the attachment detection unit changes from a first state in which the attachment of the sheet storage unit is detected to a second state in which the attachment of the sheet storage unit is not detected and, further, to the first state in which the attachment of the sheet storage unit is detected.