Medium transporting device, image reading apparatus, and transporting control method

A transporting control method in a medium transporting device, in which

• the medium transporting device includes
• a placement tray on which a medium is placed,
• a feeding roller that is in contact with a first surface of the medium, which is a surface facing the placement tray, and feeds the medium,
• a separating roller that is in contact with a second surface of the medium, which is a surface opposite to the first surface, and performs separation by nipping a document between the separating roller and the feeding roller,
• a feeder that feeds the medium in the transporting direction, and
• a two-dimensional sensor that is disposed to face a surface of the medium transported in the transporting direction, provided on the placement tray positioned upstream of the feeding roller, and detects a motion of the medium in a two-dimensional coordinate system including a first axis and a second axis, the transporting control method comprising:
• receiving a detection value in the first axis direction and a detection value in the second axis direction during an operation of the feeder from the two-dimensional sensor that is provided in a state in which the first axis and the second axis form inclination angles with respect to the transporting direction;
• and
• stopping the feeder when a difference between a movement speed in the first axis direction and a movement speed in the second axis direction exceeds a threshold value.

A transporting control method in a medium transporting device, in which

• the medium transporting device includes
• a placement tray on which a medium is placed,
• a feeding roller that is in contact with a first surface of the medium, which is a surface facing the placement tray, and feeds the medium,
• a separating roller that is in contact with a second surface of the medium, which is a surface opposite to the first surface, and performs separation by nipping a document between the separating roller and the feeding roller,
• a feeder that feeds the medium in the transporting direction, and
• a two-dimensional sensor that is disposed to face a surface of the medium transported in the transporting direction, provided on the placement tray positioned upstream of the feeding roller, and detects a motion of the medium in a two-dimensional coordinate system including a first axis and a second axis, the transporting control method comprising:
• receiving a detection value in the first axis direction and a detection value in the second axis direction during an operation of the feeder from the two-dimensional sensor that is provided in a state in which the first axis and the second axis form inclination angles with respect to the transporting direction;
• and
• stopping the feeder when a relationship between an amount of movement of the medium in the first axis direction and an amount of movement of the medium in the second axis direction satisfies a predetermined condition.