An image reading device includes: a transport unit configured to transport a medium; an emission unit configured to emit an ultrasonic wave in accordance with a driving voltage and a reception unit configured to receive the ultrasonic wave, the emission unit and the reception unit being disposed so that a transport path for the medium transported by the transport unit is interposed therebetween; a reading unit configured to read the medium; and a control unit configured to detect presence or absence of multi-feed of the medium on the basis of a signal received by the reception unit. The image reading device is configured to switch a posture into any of a first posture or a second posture. The first posture is a posture in which the transport path is sloped relative to a mounting surface. The second posture is a posture in which an angle of the transport path relative to the mounting surface is smaller than that in the first posture. The control unit sets a first driving voltage as the driving voltage when the posture is the first posture, and sets a second driving voltage lower than the first driving voltage as the driving voltage when the posture is the second posture.

A conveyance control device controls conveyance of a plurality of sheets including an image-formed sheet. The conveyance control device includes an obtaining unit configured to obtain display image data indicating a display image of each of the plurality of sheets; a region-specifying unit configured to specify common color regions having a common display color on the plurality of sheets based on the display image data; and a multiple feed detector configured to detect multiple feed of the sheets based on a light-receiving amount of light irradiated onto the common color regions; wherein the display image data indicating a display image of the image-formed sheet includes predetermined image data indicating a predetermined image to be previously formed and sheet image data indicating a sheet image displayed in a sheet color of the sheet.

A media conveyance apparatus includes a first conveyer configured to convey media along a conveyance path, a first detector configured to detect overlap-feed of the media conveyed by the first conveyor; and a controller programmed to control operation of the first conveyor based on a detection value from the first detector, a first threshold for detection of single-feed of the media, and a second threshold for detection of overlap-feed of the media.

Methods and apparatus pertaining to scanning or copying documents are provided. Sheet media are individually transported away from an input location. Optical scanning of the sheet media is initiated in accordance with detecting the passage of leading edges of the sheet media. Electronic signals resulting from the scanning are automatically analyzed to detect trailing edges of overlapping sheet media. A user notification is issued if a multiple sheet pick event is detected. A user can resume scanning or copying of a multiple sheet document at the location where the multiple sheet pick occurred.

An image forming apparatus includes an accommodation unit, feeding, conveying, and separating members, and detecting, control, image forming, and regulating units. The conveying member conveys a fed recording material. The separating member forms a nip and separates recording materials. The detecting unit detects that the recording material has been fed to the nip. The feeding member starts feeding an accommodated recording material and, where a recording material is fed to the nip, causes the feeding to be finished. An image is formed on a fed recording material. The regulating unit regulates an end on an upstream side. The control unit measures a period from a recording material feeding to detection that a recording material is fed to the nip. Based on the measured period, information is output indicating that a position of the regulating unit is deviated from a position according to a size of the accommodated recording materials.

A method of measuring properties of a moving cellulose, paper or board sheet. A first parameter of a first resonance caused by the moving sheet in a frequency range 1 GHz to 25 GHz of electromagnetic radiation is measured. A second parameter of an electromagnetic signal transmitted between at least a pair of transceiver parts of a transceiver sensor located on opposite sides of the moving sheet through the moving sheet is measured in a frequency range 25 GHz to 1000 GHz. A minimum difference between the frequency ranges related to the first parameter and the second parameter being at least 5 GHz. Both the dry stuff content and the weight of water per unit of area are determined on the basis of the first parameter, the second parameter and available information related to a distance travelled by the electromagnetic signal.

A printing apparatus includes a feeding roller configured to feed a printing sheet stacked on a stacking unit, a conveyance roller configured to convey the printing sheet fed by the feeding roller, a printing unit configured to print the printing sheet conveyed by the conveyance roller, a conveyance control unit configured to control conveyance of printing sheets so that the trailing edge of a preceding sheet as a printing sheet precedingly fed from the stacking unit and the leading edge of a succeeding sheet as a printing sheet succeedingly fed from the stacking unit overlap each other, and a determination unit configured to determine whether to convey the succeeding sheet to a position facing the printing unit while keeping an overlap state between the preceding sheet and the succeeding sheet.

A recording medium conveyance device includes a storage, a conveyer that conveys a conveyed object, an ultrasonic sensor that outputs a value indicating an attenuation amount of an ultrasonic wave caused by the conveyed object, and a hardware processor. The hardware processor executes a type detection process of detecting a type of the conveyed object based on output of the ultrasonic sensor and storing the type in the storage and an overlay detection process of detecting whether the conveyed object is in an overlay state in which a gap is present based on output of the ultrasonic sensor, and switches to either one of the type detection process and the overlay detection process. The hardware processor executes the type detection process when the type is not stored in the storage and executes the overlay detection process when the type is stored in the storage.

A printing apparatus includes a print unit configured to print an image on a print medium, a conveyance unit configured to convey a print medium to the print unit, a first feed unit configured to feed a first print medium to the conveyance unit, a second feed unit configured to feed a second print medium to the conveyance unit, and a control unit configured to control the first feed unit, the second feed unit, and the conveyance unit. The control unit is configured to start, in a state in which the first print medium is being conveyed by the conveyance unit, feeding of the second print medium to the conveyance unit by the second feed unit.

An image reading apparatus includes a control unit configured to detect occurrence or non-occurrence of multi-sheet feed of a medium based on a reception level signal output by a reception unit in accordance with the received ultrasonic wave. The control unit, after a tip of the medium reaches the positions of the reception unit in a transport path, when the reception level signal is below a predetermined threshold, causes the driving voltage to rise, when an amount of change in the reception level signal in accordance with the rise in the driving voltage is smaller than a reference amount of change, determines that multi-sheet feed is ongoing, and when the amount of change in the reception level signal in accordance with the rise in the driving voltage is greater than the reference amount of change, determines that multi-sheet feed is not ongoing.