A first zone and a second zone of a scan surface may be scanned by an image sensor. A lid may be coupled to the scan surface and have an open position and a closed position, the lid being to cover the first zone and the second zone when in the closed position. The position of a lid may be determined based on a comparison of a scan of the first zone and a scan of the second zone.

A printing system includes a printing apparatus that prints an image on a sheet, a sheet processer that executes sheet processing, and a sheet detection sensor that detects a sheet on which the sheet processing is performed not in association with the printing of an image, where the printing of an image is restricted in response to detection of a sheet by the sheet detection sensor.

An image reading apparatus includes a feed roller configured to feed a document, a transport roller disposed downstream of the feed roller and configured to transport the document downstream; a transport motor being a drive source of the transport roller; a reading unit disposed downstream of the transport roller and configured to read the document; and a control unit configured to control the reading unit and the transport motor, wherein the control unit is configured to obtain information on a document type and an inclination detection reference value for an inclination of image data set in accordance with the document type and obtained from the reading unit, and when the inclination of the image data exceeds the inclination detection reference value in accordance with the document type, the control unit stops the transport motor.

According to an automatic document feeder of a multifunction peripheral according to the present invention, two tilt sensors are provided in the middle of a document conveyance path to detect a tilt degree of a document being conveyed along the document conveyance path. Here, for example, if the positional deviation representing the tilt degree of the document is greater than a predetermined threshold value ΔLs, the conveyance of the document is stopped. On the other hand, if this is not the case, the conveyance of the document is continued. In addition, the threshold value is set in accordance with the width dimension of the document, and in particular, the larger the width dimension, the smaller the threshold value.

A reading unit is configured to capture an image of a shadow generated at a leading end of a document, and a control unit is configured to estimate a thickness of the document based on a pixel value of the shadow. A multifeeding error is displayed on a display unit when it is determined as thin paper in a thick paper determination. The control unit turns multifeeding detection to OFF and stands by until a feeding is completed, and upon completion, returns the multifeeding detection to ON.

A medium feeding device includes a medium placing portion, a feeding roller that feeds paper, a medium movement detecting portion that is positioned on a placing region of the paper of the medium placing portion in a medium feeding direction and is capable of detecting movement of the paper being fed in a width direction intersecting the medium feeding direction, and a controller that stops feeding of the paper in a case in which a physical quantity relating to movement of paper in the width direction exceeds a predetermined threshold based on a detected result by the medium movement detecting portion.

A medium feeding device includes a medium placing portion, a feeding roller that feeds paper, a medium movement detecting portion that is positioned on a placing region of the paper of the medium placing portion in a medium feeding direction and is capable of detecting movement of the paper being fed in a width direction intersecting the medium feeding direction, and a controller that stops feeding of the paper in a case in which a physical quantity relating to movement of paper in the width direction exceeds a predetermined threshold based on a detected result by the medium movement detecting portion.

In a sheet feeder, an input passage has input and output ends and an input location. A first feeder module includes: a first input roller disposed on the input end; a first output roller disposed on the output end; and a first sensing device being disposed near the first input roller and generating a first signal transmitted to a processor upon sensing presence of a first medium. A second feeder module includes: a second input roller disposed on the input end; a second output roller disposed on the output end; and a second sensing device being disposed at the input location and generating a second signal transmitted to the processor upon sensing presence of a second medium. An image acquiring device acquires an image of the first or second medium. The processor controls enabled and disabled states of the first and second feeder modules. A control method of the processor is also provided.

An image forming apparatus has an input portion that receives original image data, a control portion that generates output image data based on the original image data, a printing portion that performs printing based on the output image data, and a storage portion. The storage portion stores associated color information that defines colors associated with a plurality of prescribed processes respectively. When generating the output image data, the control portion, if the original image data includes a marked region, performs, out of the plurality of processes, the process associated with the color of the marked region.

A first zone and a second zone of a scan surface may be scanned by an image sensor. A lid may be coupled to the scan surface and have an open position and a closed position, the lid being to cover the first zone and the second zone when in the closed position. The position of a lid may be determined based on a comparison of a scan of the first zone and a scan of the second zone.