Patent ID: 8610975

Claim:
An image scanning device comprising: a main unit; a scanning unit comprising a document holding surface and configured to scan a document held on the document holding surface and to move relative to the main unit between a first base position and a first moved position; a document conveying unit configured to covey the document to be scanned by the scanning unit and to move relative to the scanning unit between a second base position and a second moved position; a cover member configured to move relative to the document conveying unit between a third base position and a third moved position; a first detector configured to output an on/off signal; and a second detector configured to output an on/off signal, wherein the first detector and the second detector are configured to output four different combinations of on/off signals including: a first combination of on/off signals output when the scanning unit, the document conveying unit, and the cover member are in the first base position, the second base position, and the third base position, respectively; a second combination of on/off signals output when the scanning unit moves from the first base position to the first moved position while the document conveying unit and the cover member are in the second base position and the third base position, respectively; a third combination of on/off signals output when the document conveying unit moves from the second base position to the second moved position while the scanning unit and the cover member are in the first base position and the third base position, respectively; and a fourth combination of on/off signals output when the cover member moves from the third base position to the third moved position while the scanning unit and the document conveying unit are in the first base position and the second base position, respectively.