Patent ID: 7597313

Claim:
A sheet transporting device comprising: a main body; a sheet feeding cassette detachable from the main body; a transporting unit that extracts sheets sheet-by-sheet and transports the sheet from the sheet feeding cassette; a swing member swingably supported by a shaft to the main body, and the swing member including a swing position, which changes among a first state in which the sheet feeding cassette is separated, a second state in which the sheet feeding cassette is mounted and the sheet is not transported, and a third state in which the sheet feeding cassette is mounted and the sheet is being transported; a detecting unit configured to detect the state of the swing member and configured to send a signal indicating whether the swing position of the swing member is in the second state or other states; and a control unit configured to receive the signal from the detecting unit and configured to determine whether the swing position is in the first state or the third state based on the signal from the detection unit, wherein the control unit determines that the swing position is in the third state when the control unit receives the signal from the detecting unit indicating the swing position of the swing member is in a state other than the second state within a predetermined time interval from the time that the transporting unit extracts the sheet from the sheet feeding cassette.