Sheet conveyor device, image reading device, and image forming apparatus

A conveyor device includes conveyor unit to convey a sheet along a path, a holder disposed at a downstream end of the path and holding sheets discharged from the conveyor unit in a stack, and a pressing unit. The pressing unit moves between a first position and a third position via a second position, contacts an uppermost sheet in the stack, and rises in an upward direction that approaches the third position as the sheets in the stack increase. The conveyor device also includes an urging member that does not apply an urging force to the pressing unit when the pressing unit is positioned between the first position and the second position; and applies an urging force to the pressing unit to urge the pressing unit toward the first position when the pressing unit is positioned between the second position and the third position.