A lateral positioning device (100) for a sheet element (20, 20) in a sheet element processing machine; a detector lever (130) articulated relative to a horizontal axis, which performs a descending movement from a high position to a low position; a first end (132) of the detector lever (130) contacts, in a low position of the lever, with an upper face of the sheet element. A second end (133) of the detector lever (130) is fitted with a target (135) that cooperates with a position detector (140) to generate a signal dependent on the thickness of the sheet element (20, 20) and the number of sheet elements (20, 20) present at the level of the first end (132) of the detector lever (130).

An inkjet recording apparatus includes a conveyance unit which conveys a recording medium, a recording unit which is disposed opposite the conveyance unit and ejects ink onto a recording medium conveyed by the conveyance unit, an edge position detection sensor which detects edge positions on both sides of the recording medium in a recording-medium width direction, and a control unit which controls ink ejection performed by the recording unit. The recording unit has a recording head where a large number of ink ejection nozzles are arrayed along the recording-medium width direction. The control unit calculates a center position of the recording medium from the edge positions on both sides in the recording-medium width detected by the edge position detection sensor, and shifts a use range of the ink ejection nozzles based on a distance between the center position calculated and a reference center position.

An image forming apparatus includes: a conveyor that conveys a sheet; a detector that detects an end position of the sheet conveyed by the conveyor in a second direction orthogonal to a first direction being a conveyance direction; a corrector that corrects deviation of the sheet by moving the sheet in the second direction on the basis of a detection result of the end position of the sheet in the second direction detected by the detector, and a hardware processor that obtains variation information based on the end position of the sheet detected by the detector, and adjusts an interval of the conveyed sheet while controlling operation of the corrector on the basis of the obtained variation information.

An image forming apparatus includes: a conveyor that conveys a sheet; a detector that detects an end position of the sheet conveyed by the conveyor in a second direction orthogonal to a first direction being a conveyance direction; a corrector that corrects deviation of the sheet by moving the sheet in the second direction on the basis of a detection result of the end position of the sheet in the second direction detected by the detector, and a hardware processor that obtains variation information based on the end position of the sheet detected by the detector, and adjusts an interval of the conveyed sheet while controlling operation of the corrector on the basis of the obtained variation information.

A recording apparatus includes a transport unit capable of transporting a medium, a detection unit capable of detecting a transport direction in which the transport unit transports the medium, a recording unit capable of performing recording on the medium transported by the transport unit, and a plurality of rotating bodies provided in an intersecting direction that intersects the transport direction. Each rotating body is capable of contacting a side surface of the medium opposite to a recording surface of the medium on which recording is performed by the recording unit and has a rotation shaft that extends in the intersecting direction. The apparatus further includes a control unit that controls rotation speed of each rotating body individually on the basis of a result of detection by the detection unit.

According to an example, an apparatus to prevent media transport jams may include an actuator to load and advance a media within a media path width. The apparatus may also include a first sensor and a second sensor to detect respective edges of the media, in which the first sensor and the second sensor may be positioned outside of a media action area and on opposite sides of the media path width. The apparatus may further include a controller to prevent the actuator from advancing the media along the media path in response to a detection of one or both of the first edge of the media by the first sensor and the second edge of the media by the second sensor.

According to an example, an apparatus to prevent media transport jams may include an actuator to load and advance a media within a media path width. The apparatus may also include a first sensor and a second sensor to detect respective edges of the media, in which the first sensor and the second sensor may be positioned outside of a media action area and on opposite sides of the media path width. The apparatus may further include a controller to prevent the actuator from advancing the media along the media path in response to a detection of one or both of the first edge of the media by the first sensor and the second edge of the media by the second sensor.

A sheet position correction device includes a detection unit, a skew correcting portion, a moving unit, and a control unit. The detection unit is configured to detect inclination of a sheet, and a position of a sheet in a width direction. The skew correcting portion is configured to convey the sheet, and correct skewing of the sheet. The moving unit is configured to move the skew correcting portion in the width direction. The control unit is configured to perform control such that skew correction of the sheet by the skew correcting portion and movement of the skew correcting portion by the moving unit are performed in parallel based on a detection result of the detection unit.

A sheet post-processor of this disclosure is provided with a punching device and a registration roller. The punching device is capable of forming punch holes along a first side end edge of a sheet parallel to a sheet width direction orthogonal to a sheet conveyance direction and a second side end edge of the sheet parallel to the sheet conveyance direction. The registration roller is disposed downstream of the punching device in the sheet conveyance direction. The punching device includes a punch unit that forms punch holes through a sheet and an edge sensor that detects the second side end edge of a sheet. In a case of forming punch holes along the second side end edge of a sheet, without skewing of the sheet being corrected by the registration roller, the edge sensor detects the second side end edge, while the punch unit forms punch holes through the sheet.

A sheet transportation device includes a guide roll along which a sheet is to be wound. The sheet includes a plurality of tabs provided intermittently in a longitudinal direction along at least one end in a width direction. The guide roll includes a cylindrical roll main body and a short-diameter portion connected with the roll main body so as to be outer, in the width direction of the sheet, to the roll main body. The roll main body is located closer to a center, in the width direction, of the sheet than a transportation path for the end. A portion of the sheet that is closer to the center than the end is wound along the roll main body. The short-diameter portion is connected with the roll main body via a stepped portion, and has an outer diameter shorter than an outer diameter of the roll main body.