Abstract: An image forming apparatus includes a scanning device and a printing device. The scanning device and the printing device are configured to be separately arranged when the image forming apparatus is in use. The printing device includes a control unit that transmits and receives signals to and from a plurality of units included in the scanning device, and a power supplying unit that supplies electric power to the units. The scanning device includes a first relay substrate that receives electric power from the power supplying unit and distributes the electric power to the units, and relays signals between each of the units and the control unit.

Abstract: A conveying distance control device includes a conveying roller; a first detecting unit detecting rotational positions of the conveying roller; a line sensor sequentially detecting marks arranged on a test chart; a calculation unit, and a control unit. The calculation unit calculates a skew angle between a line passing through positions of a first mark and a second mark and a conveying direction of the conveying roller. The control unit obtains conveying distance errors indicating differences between corrected conveying distances not including errors caused by the skew angle and theoretical conveying distance of the marks in association with the rotational positions of the conveying roller, calculates a correction value for correcting a conveying distance of the conveying roller based on relationships between the conveying distance errors and the rotational positions of the conveying roller, and controls the conveying distance of the conveying roller based on the correction value.

Abstract: An image capturing device includes: a housing; a reference pattern used for color measurement and arranged in the housing; an image capturing element that captures an image of the reference pattern in a first area and an image of an object in a second area of the image capturing area; an image forming element causing the image of the reference pattern and the image of the object to be formed on the image capturing element by being arranged on a first optical path between the image capturing element and the reference pattern and a second optical path between the image capturing element and the object; and an optical member that guides any one of the images of the reference pattern and the object formed by the image forming element so that the images are to be formed on an element surface of the image capturing element.

Abstract: A recording apparatus includes a carriage having a recording head including nozzles, a moving unit moving the carriage, a platen including plate members connected in a carriage traveling direction to support a recording medium when the nozzles eject ink onto the recording medium, a transferring unit transferring the recording medium in a transferring direction perpendicular to the carriage traveling direction, a recording control unit recording patterns at predetermined positions in the carriage traveling direction while moving the carriage in forward and backward traveling directions to form a carriage traveling direction pattern array, a determination unit determining ink ejecting times at the predetermined positions in the carriage traveling direction, and a time control unit to linearly interpolate between the determined ink ejecting times at the predetermined positions in the carriage traveling direction to control ink ejecting times for intervals between the predetermined positions based on a result of

Abstract: An image forming apparatus includes a photoconductor drum, a first printer head that forms a first pattern on the photoconductor drum and has a first end part, a second printer head that forms second and third patterns on the photoconductor drum and has a second end part that overlaps the first end part in a main scanning direction, a detection sensor that detects the densities of first and second test patterns formed at an area of the photoconductor drum at which the first and second end parts overlap, the first test pattern being formed by combining the first and second patterns, the second test pattern being formed by combining the first and third patterns, and a determination part that determines a deviation direction between the first and second printer heads by comparing the densities detected by the detection sensor.

Abstract: A movable member encoder is used to detect the position of a movable member, and a correction value calculator calculates a correction value corresponding to the amount of displacement of the movable member from a reference position and the integration of the amount of displacement. The correction value calculated by the correction value calculator is then used in correcting a voltage instruction value output from a feed motor controller to a feed motor.

Abstract: A sheet feeding apparatus is disclosed that includes a plurality of size sensors configured to be arranged in line and to detect a sheet set into a predetermined position; a feeding part configured to feed the sheet set into the predetermined position to a scan position; and a controller configured to control the feeding part to feed the sheet based on two detect signals output from two size sensors among the plurality of the size sensors.

Abstract: A conveying distance control device includes a conveying roller; a first detecting unit detecting rotational positions of the conveying roller; a line sensor sequentially detecting marks arranged on a test chart; a calculation unit, and a control unit. The calculation unit calculates a skew angle between a line passing through positions of a first mark and a second mark and a conveying direction of the conveying roller. The control unit obtains conveying distance errors indicating differences between corrected conveying distances not including errors caused by the skew angle and theoretical conveying distance of the marks in association with the rotational positions of the conveying roller, calculates a correction value for correcting a conveying distance of the conveying roller based on relationships between the conveying distance errors and the rotational positions of the conveying roller, and controls the conveying distance of the conveying roller based on the correction value.

Abstract: An image scanning device includes a base part; and multiple image sensors each including a substrate, a line sensor including scanning elements arranged on the substrate, and a holder for holding the substrate. The base part holds the image sensors such that the scanning elements of an image sensor partly overlap the scanning elements of an adjacent image sensor in the main-scanning direction. The coefficients of linear expansion of the substrate and the base part are substantially the same; the holder and the base part are fixed together at a first fixing point; the holder and the substrate are fixed together at a second fixing point; and the distance in the main-scanning direction between the first fixing point and the second fixing point and the direction of the second fixing point with respect to the first fixing point are the same for all the image sensors.

Abstract: An image forming apparatus includes a scanning device and a printing device. The scanning device and the printing device are configured to be separately arranged when the image forming apparatus is in use. The printing device includes a control unit that transmits and receives signals to and from a plurality of units included in the scanning device, and a power supplying unit that supplies electric power to the units. The scanning device includes a first relay substrate that receives electric power from the power supplying unit and distributes the electric power to the units, and relays signals between each of the units and the control unit.