Image reading device

An image reading device comprising:

• a feed roller for feeding a medium downstream in a transport direction;
• a separation roller configured to nip the medium between itself and the feed roller and to separate the medium, to enter a separating state in which the separation roller is driven in a rotation direction to return the medium upstream in the transport direction, and to enter a non-separating state in which driving force of rotation is not transmitted;
• a reading section that is positioned downstream of the feed roller and the separation roller in the transport direction and that is configured to read the medium;
• a switching section that includes an input gear which rotates by receiving power and that is configured to perform switching between the separating state and the non-separating state by rotation of the input gear in a certain rotation direction;
• a first power transmission section configured to transmit the driving force to the input gear;
• and
• a second power transmission section that is a power transmission section configured to transmit the driving force to the separation roller and in which a switch is performed, by the switching section, between a state in which the driving force is transmitted to the separation roller and a state in which the driving force is not transmitted to the separation roller, wherein
• the first power transmission section is configured to transmit driving force from a first drive source that drives the feed roller to the input gear and
• furthermore, the first power transmission section includes a one-way clutch that does not transmit power of the first drive source to the input gear when the first drive source rotates in a first rotation direction, which is a rotation direction during medium feeding, and transmits the power of the first drive source to the input gear when the first drive source rotates in a second rotation direction, which is opposite to the first rotation direction.