Image reading device

An image reading device comprising:

• a platen glass comprising a document holding portion;
• a document tray configured to hold document sheets;
• a document feeder configured to feed the document sheets sequentially from the document tray along a conveying path to an image reading position;
• an image sensor configured to operate selectively in a first mode, in which the image sensor moves along the platen glass in an image sensor moving direction and reads an image from a document sheet disposed on the document holding portion, and in a second mode, in which the image sensor is stopped at the image reading position and reads ran image from a document sheet fed by the document feeder;
• a first plate configured to face the document holding portion;
• a discharge guide member configured to guide the document sheet fed by the document feeder in a direction downstream from the image reading position;
• and
• a sliding mechanism configured to slide the first plate between the document tray and the platen glass relative to the document feeder, the document tray, and the platen glass, from a first position to a second position along the platen glass in a sliding direction parallel to the image sensor moving direction, such that,
• the first plate covers the image reading position when the first plate is in the first position, and the first plate is separated from the image reading position in the sliding direction parallel to the image sensor moving direction when the first plate is in the second position,
• wherein the image sensor is configured to operate in the first mode, when the first plate is in the first position, and to operate in the second mode, when the first plate is in the second position.