Patent ID: 8346152

Claim:
An automatic document feeder, comprising: a document tray configured for placement of a document to be read thereon; an output tray configured to hold the document to be read after image reading of the document is finished; a movable ejection flap configured to be movable between a first position and a second position, wherein when the movable ejection flap is moved to the first position, the document for which the image reading is finished is inserted into a position between the output tray and a bottom of a stack of documents on the output tray, and wherein when the movable ejection flap is moved to the second position, the document is ejected onto the output tray in a position other than the position between the output tray and the bottom of the stack of documents, and wherein the movable ejection flap is disposed upstream from the output tray in a document ejection direction; and a change unit configured to change a position of the movable flap in response to a predetermined condition being satisfied; and a controller configured to: determine whether the predetermined condition has been satisfied based on information received from at least one other component of the automatic document feeder, wherein the at least one other component includes a sensor; and in response to determining that the predetermined condition has been satisfied, control the change unit to change the position of the movable ejection flap from the first position to the second position when the movable ejection flap is in the first position, wherein the controller is configured to judge whether a total weight of documents placed on the document tray exceeds a predetermined value based on the information received from the at least one other component of the automatic document feeder, and wherein the predetermined condition includes the total weight of the documents placed on the document tray exceeding the predetermined value.