A reader CPU stops a lead motor in a case in which a discharge sensor cannot detect reaching of a leading edge part of an original D even though the original is conveyed by a first amount (L.sub.P3+L.sub.M1) or a second amount (L.sub.P3+L.sub.M2) which is smaller than the first amount from when a lead sensor detects the original, when a reader image processing portion (leading edge detection portion) cannot detect the leading edge part of the original from image data of a first face of the original.

An image reading device includes a plurality of conveyance rollers to convey a sheet, a motor to drive the plurality of conveyance rollers, an image reading unit to read an image of the sheet, a control device to perform a stop control that stops the sheet in a course of a conveyance path, and a clutch to transmit a driving force of the motor. A first conveyance roller group includes at least one of the plurality of conveyance rollers upstream from a leading end of the sheet stopped by the stop control in a conveyance direction, to which the driving force is transmitted via the clutch. A second conveyance roller group includes at least one of the plurality of conveyance rollers downstream from the leading end of the sheet stopped by the stop control in the conveyance direction, to which the driving force is transmitted without the clutch.

An image reading apparatus includes a pair of first detection sections disposed between first positions for the feeding rollers and the separation rollers for nipping and second positions for the transport roller pair for nipping, and a pair of second detection sections disposed between the first detection sections and the second positions in the medium transport direction. The second detection sections are disposed between the first detection sections in the medium width direction, and a controller determines whether to stop transporting the medium or continue transporting the medium based on the results of detection by the first detection sections and the second detection sections.

A printing control apparatus includes a conveying unit that conveys a document to a reading unit, a detection unit that detects a size of the document before it begins to be conveyed, a detection unit that detects the size of the document after the document begins to be conveyed, and a control unit that performs a copy job using the reading unit and printing unit based on the size of the document detected before it is conveyed in a case where the printing unit starts to print the image data before the reading unit finishes generating image data for one page and performs a copy job based on the size of the document detected after it begins to be conveyed in a case where the printing unit starts to print the image data after the reading unit finishes generating image data for at least one page.

A conveying device includes a sensor to read a sheet to be conveyed, a first conveyor arranged on an upstream side from the sensor in a sheet conveying direction of the sheet, a second conveyor arranged on a downstream side from the sensor in the sheet conveying direction, and correcting circuitry to correct a distance of the sheet having an error detected when the sensor reads the sheet conveyed by the first conveyor and the second conveyor, to an actual distance. The correcting circuitry uses at least a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

An automatic document feeding system includes an image reader including an optical window and a light source illuminating the optical window, and an automatic document feeder including a reflective flag positioned within a viewing region of the optical window.

An image reading apparatus includes a first sensor, a second sensor, a third sensor, a first processor that generates a first merge image based on first image data acquired by reading by the first sensor and second image data acquired by reading by the second sensor, and a second processor that generates a second merge image based on the second image data and third image data acquired by reading by the third sensor, and generates an output image by performing a linking process on the first merge image and the second merge image.

An image reading apparatus includes a pair of first detection sections disposed between first positions for the feeding rollers and the separation rollers for nipping and second positions for the transport roller pair for nipping, and a pair of second detection sections disposed between the first detection sections and the second positions in the medium transport direction. The second detection sections are disposed between the first detection sections in the medium width direction, and a controller determines whether to stop transporting the medium or continue transporting the medium based on the results of detection by the first detection sections and the second detection sections.

An image reading apparatus is provided with a reader which reads a document, a transport roller which is provided on an upstream side of the reader in a document transport path in which the document is transported and transports the document to a reading position of the reader, and a controller which receives reading data of the reader and controls the transport roller, in which the controller receives the reading data from the reader to acquire a form of the document, and selects whether or not to stop driving of the transport roller based on the form.

When a multi-feed of a document is detected, an image reading device acquires a document width from image data generated by a reading unit reading a leading end portion of the document. The document width is a length of the document in a width direction intersecting a transport direction. When, based on the document width, the size of the document corresponds to a specific size of a plastic card or an instant film, the image reading device does not execute error processing in response to an occurrence of the multi-feed, and when the size of the document does not correspond to the specific size, the image reading device executes the error processing.