Image reading apparatus

An image reading apparatus, comprising:

• a feed tray configured to support sheets for being fed, the feed tray comprising a movable plate configured to move in a vertical direction between a standby position and a feedable position being higher than the standby position according to an amount of the sheets supported by the feed tray;
• a conveyance guide configured to guide the sheets conveyed from the feed tray;
• a feed roller movable in the vertical direction, the feed roller being configured to feed the sheets supported by the feed tray to be conveyed along the conveyance guide, a positional relation between the feed roller and an uppermost sheet in the sheets supported by the feed tray being maintained within a predetermined range by the movable plate located at the feedable position;
• a separator configured to nip and separate the sheets fed by the feed roller from one another and convey the sheets separately along the conveyance guide;
• a reading sensor configured to read images of the sheets conveyed along the conveyance guide;
• a pressing member configured to press the feed roller against the sheets supported by the feed tray;
• and
• a controller configured to
• obtain thickness information concerning a thickness of the sheets supported by the feed tray,
• move the movable plate to the feedable position,
• move the movable plate to one of ascend and descend for a distance corresponding to the thickness information, and
• control at least rotating-and-stopping movements of the feed roller and the separator and ascending-and-descending movements of the movable plate,
• wherein, while the feed roller feeds the sheets, the controller is configured to conduct a vibrating action, in which the movable plate located at the feedable position is moved to ascend and descend for a plurality of times.