Patent ID: 9199809
Filing Date: 2015-12-01
Classification: B65H

Abstract:
1. A sheet feeding device comprising: a sheet storage unit configured to store sheets, wherein the sheet storage unit is configured to be attached to an apparatus main body and to be drawn from the apparatus main body; a stacking portion provided in the sheet storage unit, wherein sheets are stacked on the stacking portion; a raising unit configured to raise the stacking portion, wherein the stacking portion is configured to be lowered in response to the sheet storage unit being drawn from the apparatus main body; a sheet detection unit configured to detect that an upper most sheet stacked on the stacking portion is positioned at a higher position that is higher than a sheet detection position in a vertical direction; an attachment detection unit configured to detect that the sheet storage unit is attached to an attachment position of the apparatus main body; and a control unit configured to determine whether an amount of sheets stacked on the stacking portion exceeds a predetermined amount based on detection results of the sheet detection unit and the attachment detection unit, wherein, according to the sheet storage unit being drawn out of the attachment position of the apparatus main body in an amount exceeding a first amount, a state of 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, wherein, according to the sheet storage unit being drawn out of the attachment position of the apparatus main body in an amount exceeding a second amount, a state of the sheet detection unit changes from a third state in which the uppermost sheet is detected to a fourth state in which the uppermost sheet is not detected, wherein the first amount by which the sheet storage unit is drawn out from the apparatus main body relative to the attachment position is smaller than the second amount by which the sheet storage unit is drawn out from the apparatus main body relative to the attachment position, wherein, in a case where the sheet storage unit is drawn out of the attachment position of the apparatus main body in an amount exceeding the first amount and less than or equal to the second amount, the attachment detection unit is in the second state in which the attachment of the sheet storage unit is not detected and the sheet detection unit is in the third state in which the uppermost sheet is detected, and wherein the control unit determines that the amount of sheets stacked on the stacking portion does not exceed the predetermined amount in a case where the detection result of the sheet detection unit does not change from the third state to the fourth state in a series of processes in which a detection result of the attachment detection unit changes from the first state to the second state, and further to the first state.