Image reading device that reads an image of a document

An image reading device comprising:

• an original document tray on which an original document is to be placed;
• a plurality of conveyance rollers configured to convey the original document in a conveyance direction;
• an image reading unit configured to read an image of the conveyed original document at a reading position;
• and
• a controller configured to selectively execute first conveyance control and second conveyance control based on a width of the original document, which is a length of the original document in a direction orthogonal to the conveyance direction,
• wherein the plurality of conveyance rollers includes a first conveyance roller arranged upstream of the reading position in the conveyance direction, and a second conveyance roller arranged downstream of the reading position in the conveyance direction,
• wherein, in the first conveyance control, the controller is configured to change a drive speed of the first and second conveyance rollers from a first speed to a second speed that is faster than the first speed after the original document reaches the first conveyance roller and before the original document passes through the reading position, and to change the drive speed of the first and second conveyance rollers from the second speed to the first speed after the original document reaches the second conveyance roller and before the reading of the image of the original document completes, and
• wherein, in the second conveyance control, the controller is configured to change the drive speed of the first and second conveyance rollers from the first speed to a third speed, faster than the first speed and slower than the second speed, after the original document reaches the first conveyance roller and before the original document passes through the reading position, and to change the drive speed of the first and second conveyance rollers from the third speed to the first speed after the original document reaches the second conveyance roller and before the reading of the image of the original document completes.