Patent ID: 8348269

Claim:
An image scanning device, comprising: a scanning specifying unit arranged to specify one of at least two scanning methods, each of the at least two scanning methods having a different transportation interval between documents; at least two document detecting units arranged to detect a document at different positions along a transportation route; a supply timing adjusting unit arranged: (i) to measure a transportation distance of the document after the document has been detected by the at least two document detecting units, and (ii) to generate a supply signal based on a result of detection by one of the at least two document detecting units, the one of the at least two document detecting units used in generating the supply signal corresponding to the scanning method specified by the scanning specifying unit; and a document supplying unit arranged to supply a document from a paper feed tray based on the supply signal; wherein the at least two document detecting units include a first document detecting unit used only in a first mode and a second document detecting unit used only in a second mode.