Patent ID: 7954803

Claim:
An image reading apparatus comprising: a reading unit that reads an image from a first medium and a second medium thicker than the first medium; and a conveying unit that includes a plurality of pairs of rollers, each pair including a driving roller and a driven roller that is biased towards the driving roller and rotates along with the driving roller, and that conveys the first medium and the second medium to the reading unit while nipping the first medium and the second medium between the driving rollers and the driven rollers, the plurality of pairs of rollers being arranged along a direction of a rotation axis of the driving rollers and including: a first roller group that includes at least two adjacent pairs of the plurality of pairs of rollers and that conveys the first medium; and a second roller group that includes at least two adjacent pairs of the plurality of pairs of rollers, the second roller group including a controlling member that controls a biasing force applied by at least one of the driven rollers of the second roller group to the first medium, and that conveys the second medium; a first-roller-group center position, in the direction of the rotation axis of the at least two adjacent pairs of the first roller group, is identical to a first center position in the direction of the rotation axis of a first conveying area, over which the first medium is conveyed; a second-roller-group center position, in the direction of the rotation axis of the at least two adjacent pairs of the second roller group, is identical to a second center position in the direction of the rotation axis of a second conveying area, over which the second medium is conveyed; and at least one pair of the at least two adjacent pairs of rollers in the second roller group is arranged outside of one end of the first roller group in the direction of the rotation axis and within the first conveying area; wherein the controlling member is configured to prevent the rollers in at least one pair of the plurality of pairs of rollers in the second roller group from abutting each other when the first medium is conveyed.