A sheet feeder apparatus includes a width detector for a sheet placed on a sheet placement portion, a conveyor for conveying sheets while separating the sheets one by one, a first detector for detecting a sheet having a first width at a plurality of first positions, a second detector for detecting a sheet having a second width that is not detected by the first sheet detector at a plurality of second positions, and a controller for determining skewing of a sheet based on a result of the detection of the sheet performed by the first detector if the width of the sheet is the first width, and determining skewing of a sheet based on a result of the detection performed by the second detector if the width of the sheet is the second width.

An image forming apparatus includes an image forming unit, a casing, a sheet discharge unit, a sheet supporting portion, an operation unit, a supporting unit, and a regulating portion. The supporting unit supports the operation unit such that, when the display surface is tilted with respect to a horizontal direction, an end on a lower side of the operation unit is positioned below a second virtual straight line. The regulating portion is disposed between the operation unit and the sheet supporting portion in the vertical direction. The regulating portion is disposed such that at least a part of the regulating portion overlaps the operation unit and the supporting surface in a width direction. The regulating portion is disposed to intersect with the second virtual straight line. The regulating portion is configured to regulate an obliquely upward movement of a recording material discharged by the sheet discharge unit.

An image forming apparatus includes an image forming unit, a casing, a sheet discharge unit, a sheet supporting portion, an operation unit, a supporting unit, and a regulating portion. The supporting unit supports the operation unit such that, when the display surface is tilted with respect to a horizontal direction, an end on a lower side of the operation unit is positioned below a second virtual straight line. The regulating portion is disposed between the operation unit and the sheet supporting portion in the vertical direction. The regulating portion is disposed such that at least a part of the regulating portion overlaps the operation unit and the supporting surface in a width direction. The regulating portion is disposed to intersect with the second virtual straight line. The regulating portion is configured to regulate an obliquely upward movement of a recording material discharged by the sheet discharge unit.

An image forming apparatus includes an image forming unit, a casing, a document reading unit, a sheet discharge unit, a sheet supporting portion, an operation unit, and a supporting unit. If a region which a plurality of the recording material occupies when a maximum number of a maximum size of a recording material supportable on the sheet supporting portion is supported is defined as an occupied region, the operation unit is disposed such that a part of the operation unit in a width direction overlaps the occupied region. The rotational axis is positioned downstream of a center of the operation unit in the sheet discharge direction and downstream of the document reading unit in the sheet discharge direction. The supporting unit supports the operation unit such that, when the operation unit is positioned in a second position, a lower end of the operation unit is positioned above the occupied region.

An image forming apparatus includes an image forming unit, a casing, a document reading unit, a sheet discharge unit, a sheet supporting portion, an operation unit, and a supporting unit. If a region which a plurality of the recording material occupies when a maximum number of a maximum size of a recording material supportable on the sheet supporting portion is supported is defined as an occupied region, the operation unit is disposed such that a part of the operation unit in a width direction overlaps the occupied region. The rotational axis is positioned downstream of a center of the operation unit in the sheet discharge direction and downstream of the document reading unit in the sheet discharge direction. The supporting unit supports the operation unit such that, when the operation unit is positioned in a second position, a lower end of the operation unit is positioned above the occupied region.

A document conveyance device includes a sheet feeding tray, a conveyance mechanism, a discharge tray, a document pressing member and a supporting mechanism. The document pressing member comes into contact with an upper face of the document discharged from a conveyance path and presses the document downward. The supporting mechanism is configured to be provided in the sheet feeding tray, to support the document pressing member, to allow a shifting of the document pressing member according to an operation for shifting the document pressing member in a discharge direction of the document or an opposite direction to the discharge direction and to inhibit the shifting of the document pressing member against a force applied to the document pressing member by the discharged document.

An image recording apparatus including: a recording unit; an accommodation part configured to accommodate therein a plurality of recording media including first and second recording medium and having a support surface on which the plurality of the recording media is supported; a conveying path; a feeder roller contacting the recording medium in the accommodation part from above; a reversing path; a recording medium detection unit located above the support surface and between the feeder roller and a downstream end of the support surface in the conveying direction; and a controller configured to control the feeder roller so as to feed the second recording medium in a manner that a front end portion of the second recording medium overlaps a rear end portion of the first recording medium, when the recording medium detection unit detects the rear end portion of the first recording medium fed by the feeder roller.

A sheet conveyance device includes a roller by which a sheet having a wireless tag is conveyed along a path, a communication device configured to transmit a radio signal to the wireless tag and receive a response signal therefrom, and a processor configured to repeatedly perform a process of controlling the roller to convey a sheet along the path while controlling the communication device to transmit the radio signal to a wireless tag of the sheet using a transmission power that is different in each repeat, and acquire a strength of the response signal from the wireless tag, and specify a minimum strength of the response signal that has been acquired in the repeated process, the minimum strength being equal to or greater than a threshold, and set a transmission power that has been used when the minimum strength has been acquired as a reference strength of the radio signal.

A sheet conveyance device includes a roller by which a sheet having a wireless tag is conveyed along a path, a communication device configured to transmit a radio signal to the wireless tag and receive a response signal therefrom, and a processor configured to repeatedly perform a process of controlling the roller to convey a sheet along the path while controlling the communication device to transmit the radio signal to a wireless tag of the sheet using a transmission power that is different in each repeat, and acquire a strength of the response signal from the wireless tag, and specify a minimum strength of the response signal that has been acquired in the repeated process, the minimum strength being equal to or greater than a threshold, and set a transmission power that has been used when the minimum strength has been acquired as a reference strength of the radio signal.

An image forming apparatus includes a paper feeding cassette, a first conveying unit, a lift mechanism, a motor, a second conveying unit, and a control unit. The controller drives the motor and, if a value indicating a movement amount of the tray moving from when the lift mechanism starts the lifting of the tray until when a position of the top part reaches a first position is a first value, matches a position of the first conveying unit, which comes into contact with the top part to thereby rise together with the tray, with a second position and, if the value indicating the movement amount is a second value larger than the first value, matches the position of the first conveying unit, which comes into contact with the top part to thereby rise together with the tray, with a third position lower than the second position.