Sheet-edge detecting device and image forming apparatus

A sheet-edge detecting device comprising:

• first and second detectors configured to be disposed at an edge of a transported sheet comprising feed holes arranged in a direction of the sheet,
• wherein the first and second detectors are configured to detect presence or absence of the sheet;
• and
• a controller configured to determine a position of the edge of the sheet using detection results obtained by the first and second detectors;
• wherein the first and second detectors are configured to be separated from each other in the transporting direction of the sheet such that the first and second detectors cannot be simultaneously positioned in one or more of the feed holes,
• wherein the first and second detectors are configured to be separated from each other in a direction perpendicular to the transporting direction of the sheet such that the first and second detectors cannot be simultaneously positioned in one of the feed holes and outside the edge of the sheet,
• wherein one of the first and second detectors is configured to be located at a position corresponding to an allowable displacement of the edge of the sheet, and
• wherein the other one of the first and second detectors is configured to be located closer to the edge of the sheet than the one of the first and second detectors.