A document sheet length detection portion detects document sheets placed on a tray while distinguishing between a first size document sheet whose length in a conveyance direction is equal to or longer than a reference length, and a second size document sheet whose length in the conveyance direction is shorter than the reference length. A selection portion selects, as a specified conveyance process, one of a first conveyance process and a second conveyance process. A control portion, after a predetermined start event occurs, causes a conveyance device to execute the second conveyance process when the second conveyance process has been selected as the specified conveyance process and the document sheet length detection portion has detected the first size document sheet, and causes the conveyance device to execute the first conveyance process when a number of document sheets conveyed during the second conveyance process has reached an upper-limit number.

An upper unit includes a feed tray configured to support a document to be fed such that the document is inclined, a transport path configured to reverse the document fed in a direction having a vertically downward component by a feed tray in a direction having a vertically upward component, a first reader disposed on the transport path, and a discharge tray configured to support the discharged document such that the document is inclined. A lower unit includes a document positioning plate on which a document is mounted, and includes a second reader disposed vertically below the document positioning plate and configured to read the document mounted on the document positioning plate. A portion of the first reader and a portion of the document positioning plate overlap when viewed from vertically above.

An image reading apparatus, including a feed tray, a conveyance guide, a conveyer, a reading sensor, a first housing, a first driving source, a first driving train, a second driving source, and a second driving train, is provided. The first housing accommodates at least the conveyance guide and the conveyer and has a first outer face and a second outer face facing opposite to each other in a widthwise direction. The first driving source and the first driving train are accommodated in the first housing on a side toward the first outer face. The first driving train transmits a driving force from the first driving source to the conveyer. The second driving source and the second driving train are accommodated in the first housing on a side toward the second outer face. The second driving train transmits a driving force from the second driving source to the movable plate.

A document sheet length detection portion detects document sheets placed on a tray while distinguishing between a first size document sheet whose length in a conveyance direction is equal to or longer than a reference length, and a second size document sheet whose length in the conveyance direction is shorter than the reference length. A selection portion selects, as a specified conveyance process, one of a first conveyance process and a second conveyance process. A control portion, after a predetermined start event occurs, causes a conveyance device to execute the second conveyance process when the second conveyance process has been selected as the specified conveyance process and the document sheet length detection portion has detected the first size document sheet, and causes the conveyance device to execute the first conveyance process when a number of document sheets conveyed during the second conveyance process has reached an upper-limit number.

An image reading apparatus includes an original tray on which an original is to be stacked; a conveyance unit configured to convey the original stacked on the original tray; a reading unit including a reading sensor having a light receiving element to receive light of a first color and a light receiving element to receive light of a second color that is different from the first color, wherein the reading unit is configured to read an image of the original conveyed by the conveyance unit by using the reading sensor to generate image data which represents a reading result of the reading unit; at least one processor configured to: determine a first abnormal position which is a position in a first direction of an abnormal pixel of the first color in the image represented by the image data, wherein, in the image represented by the image data.

A sheet feeder includes a separation roller, a retard roller, and a return latch. The separation roller rotates in a forward direction to separate a sheet and transport the separated sheet in a sheet transport direction. The retard roller forms, together with the separation roller, a nip point and rotates in a reverse direction to return a sheet in a direction opposite to the sheet transport direction. The return latch moves from a retracted position to a protruding position to return a sheet remaining after separation by the separation roller to a position upstream of the nip point in the sheet transport direction. The return latch, when at the retracted position, is retracted from a sheet transport path and, when at the protruding position, protrudes to the sheet transport path.

An image reading apparatus includes an image sensor, a document feeder, and a processor. The document feeder includes a first driving device, a second driving device, a third driving device, a first sensor, and a second sensor. The first driving device includes a pick-up member to move documents from a tray to a document conveying path using a driving force through a first clutch. The second driving device is to move the tray with the documents to a side of the pick-up member using a driving force through a second clutch. The third driving device to move the documents along the document conveying path onto the image sensor using the driving force of the motor The first and second sensors detect the documents on the document conveying path. The processor controls an operation of the first clutch based on the signals of the first and second sensors.

An image reading apparatus includes an image sensor, a document feeder, and a processor. The document feeder includes a first driving device, a second driving device, a third driving device, a first sensor, and a second sensor. The first driving device includes a pick-up member to move documents from a tray to a document conveying path using a driving force through a first clutch. The second driving device is to move the tray with the documents to a side of the pick-up member using a driving force through a second clutch. The third driving device to move the documents along the document conveying path onto the image sensor using the driving force of the motor The first and second sensors detect the documents on the document conveying path. The processor controls an operation of the first clutch based on the signals of the first and second sensors.

A document conveyance apparatus includes a conveyance part, a document cover, a stopper and a restriction member. One end of the stopper is rotatably supported by the document cover, and the other end of the stopper is movably supported by an elongated hole formed in the conveyance part. The stopper supports the document cover with respect to the conveyance part at a fixed opening angle. The restriction member is attached to the elongated hole. When the restriction member is attached to the elongated hole on the side of the one end edge, a moving amount of the other end of the stopper along the elongated hole at a time of opening the document cover is restricted to be short so that the document cover is supported at an opening angle smaller than the fixed opening angle.

A document conveyance apparatus includes a conveyance part, a document cover, a stopper and a restriction member. One end of the stopper is rotatably supported by the document cover, and the other end of the stopper is movably supported by an elongated hole formed in the conveyance part. The stopper supports the document cover with respect to the conveyance part at a fixed opening angle. The restriction member is attached to the elongated hole. When the restriction member is attached to the elongated hole on the side of the one end edge, a moving amount of the other end of the stopper along the elongated hole at a time of opening the document cover is restricted to be short so that the document cover is supported at an opening angle smaller than the fixed opening angle.