Medium transport apparatus, image reading apparatus, and transport control method

A method of controlling a medium transport apparatus including a feed unit configured to feed a medium to a transport direction, a first detection unit disposed upstream of the feed unit and facing a face of the medium to be transported to the transport direction, and configured to detect movement of the medium to be fed downstream by the feed unit, and a second detection unit disposed downstream of the first detection unit and configured to detect an inclination of the medium, the method comprising:

• a plurality of the threshold values being set for an inclination of the medium, and the plurality of the threshold values have a relationship such that a first threshold of the plurality of thresholds is set by a length of a first medium in the transport direction determined by the first detection unit and when a second length of another medium in the transport direction determined by the first detection unit is shorter than a first length, a threshold of the other medium is set to be relatively higher value than the first threshold, and
• selecting any one of the plurality of threshold values based on a detection value of the first detection unit that determines the length of the medium in the transport direction;
• detecting an inclination of the medium based on a signal received from the second detection unit;
• and
• when the inclination exceeds one of the plurality of threshold values, stopping transfer of the medium.