A method and apparatus for processing documents is provided. The documents may be conveyed to a feeder for feeding documents to a scanner. The scanner scans each document to obtain image data and then discharges the document to one or more output or sort locations. The system may include a skew reduction assembly for reducing skew in the documents as the documents are fed to the scanner. The system may also include elements for improving image quality and reducing document damage while the document is scanned. The system may further include features for improving the stacking of the discharged documents.

An image forming apparatus includes: an image forming apparatus main body; and an optional paper feeder optionally attachable to the image forming apparatus main body, the image forming apparatus main body has: an image former that executes image forming processing to form an image on a sheet-like image recording medium; and a resist roller that conveys the image recording medium, and the optional paper feeder has: a first accommodation device that accommodates a plurality of the image recording media; a first paper feed roller that feeds the image recording media one by one to a first conveyance path connected to a conveyance position; and an acceleration/deceleration roller that conveys the image recording medium to the conveyance position, the image forming apparatus further includes: a controller that controls a conveyance speed of the image recording medium by the acceleration/deceleration roller.

A medium conveying apparatus includes a plurality of feed rollers spaced in a direction perpendicular to a medium conveying direction, each of the feed rollers rotating independently at a respective speed to feed a medium, a plurality of brake rollers, each of the plurality of brake rollers being located to face a corresponding one of the plurality of feed rollers, a plurality of torque limiters separately provided between one of rotation shafts of the plurality of brake rollers and a corresponding one of the plurality of brake rollers, and a processor to detect a skew of the medium, and correct the skew of the medium by changing the speed of one of the plurality of feed rollers when the skew of the medium is detected.

A method and apparatus for processing documents is provided. The documents may be conveyed to a feeder for feeding documents to a scanner. The scanner scans each document to obtain image data and then discharges the document to one or more output or sort locations. The system may include a skew reduction assembly for reducing skew in the documents as the documents are fed to the scanner. The system may also include elements for improving image quality and reducing document damage while the document is scanned. The system may further include features for improving the stacking of the discharged documents.

A medium conveying apparatus includes a plurality of feed rollers spaced in a direction perpendicular to a medium conveying direction, each of the feed rollers rotating independently at a respective speed to feed a medium, a plurality of brake rollers, each of the plurality of brake rollers being located to face a corresponding one of the plurality of feed rollers, a plurality of torque limiters separately provided between one of rotation shafts of the plurality of brake rollers and a corresponding one of the plurality of brake rollers, and a processor to detect a skew of the medium, and correct the skew of the medium by changing the speed of one of the plurality of feed rollers when the skew of the medium is detected.

Provided is an image reading apparatus capable of accurately detecting an inclination amount of an original image by recognizing an edge part of the original image with high precision even when dust, stain, or the like adheres to a background part. The image reading apparatus includes: an original reader configured to read an image of an original; and a volume resistor configured to represent an original width of the original by a resistance value. The image reading apparatus further includes: a skew feed amount detector configured to set a predetermined range including the edge part of the original in a width direction as an edge detection range based on the original width, to acquire an edge image being the edge part of the original from an image within the edge detection range.

An image reading apparatus includes a conveying unit configured to convey a document, a reading unit configured to read an image on the conveyed document, a measurement unit configured to measure a distance from an upper portion of a sheet feeding port for the document to an upper surface of the document, and a control unit configured to, according to the distance measured by the measurement unit, suspend the conveyance of the document by the conveying unit. According to a user operation for reading again the document of which the reading is suspended by the control unit, the conveying unit conveys the document and the reading unit reads the image on the document, and while the document of which the conveyance is suspended is conveyed again, the control unit does not suspend the conveyance of the document based on the distance measured by the measurement unit.

In an image processing device, an image capturing section receives light reflected by a document, captures an image of the document with the light, and generates read data of the image. The light includes visible light and invisible light. The image includes a visible image and an invisible image. A first image processing circuit detects coordinates of first points on a boundary between the document and a white reference plate in the visible image and coordinates of second points on the boundary in the invisible image, calculates a first detection result, first detection error information, a second detection result, and second detection error information, and selects the first or second detection result based on the first and second error information. The calculation of the first detection result and the first error information and the calculation of the second detection result and the second error information are sequentially performed.

An image reading apparatus includes a conveying unit configured to convey a document, a reading unit configured to read an image on the conveyed document, a measurement unit configured to measure a distance from an upper portion of a sheet feeding port for the document to an upper surface of the document, and a control unit configured to, according to the distance measured by the measurement unit, suspend the conveyance of the document by the conveying unit. According to a user operation for reading again the document of which the reading is suspended by the control unit, the conveying unit conveys the document and the reading unit reads the image on the document, and while the document of which the conveyance is suspended is conveyed again, the control unit does not suspend the conveyance of the document based on the distance measured by the measurement unit.

An electronic apparatus includes a resist unit and a control part. The resist unit includes a resist roller that feeds a recording medium to a processing part that performs processing on the recording medium and a correction motor capable of moving the resist roller to correct a deviation of the recording medium. The control part drives the correction motor with a first pulse signal having a first frequency, and then drives the correction motor with a second pulse signal having a second frequency, which is a frequency lower than the first frequency and is a frequency capable of applying to the resist unit vibration components of a phase opposite to a phase of vibrations in the resist unit.