Image reading device

摘要

An image reading device includes a first reading unit, second reading unit, and determining unit. The first and second reading units are configured to read one surface and another surface of an original, respectively. The second reading unit is disposed downstream of the first reading unit with respect to a conveying path. The determining unit determines, based on read data obtained by reading the one surface with the first reading unit before the original is arrived at the second reading unit, whether or not an image is formed on the one surface. The first reading unit continues reading the one surface and the second reading unit fails to read another surface when an image is formed on the one surface. The second reading unit reads another surface and the first reading unit fails to read the one surface when an image is not formed on the one surface.

主权项

1. An image reading device comprising:
a housing defining a conveying path for conveying sheets having first and second sides; a first reading unit configured to read data on the first sides of the sheets conveyed along the conveying path; a second reading unit disposed downstream of the first reading unit with respect to the conveying path, the second reading unit configured to read data on the second sides of the sheets conveyed along the conveying path; and a controller configured to:
determine, based on first read data obtained from the first side of a first sheet with the first reading unit before the first sheet has arrived at the second reading unit, whether an image is formed on the first side of the first sheet;control the first reading unit to continue reading the first side of the first sheet to acquire second read data including the first read data and data different from the first read data, and the second reading unit does not obtain data from the second side of the first sheet, when the controller determines that an image is formed on the first side of the first sheet; andcontrol the second reading unit to read the second side of the first sheet to acquire third read data different from the first and second read data and stop the reading of the first side of the first sheet by the first reading unit, when the controller determines that an image is not formed on the first side of the first sheet.