A sheet transport device includes a sheet transport unit, a detector, and a releasing unit. The sheet transport unit transports a sheet by nipping the sheet in a nip between multiple pairs of transport rollers arranged in a sheet width direction intersecting a sheet transport direction. The detector detects a size of the transported sheet. The releasing unit releases the nip of one or more of the pairs of transport rollers outside a transport region of the sheet based on the size of the sheet detected by the detector.

An image forming system includes: an image former that forms an image on a paper sheet; a post-processor that executes post-processing on the paper sheet; a paper sheet stacker that stacks the paper sheet output from the post-processor on a paper discharge tray; and a hardware processor that controls the image former, the post-processor, and the paper sheet stacker, wherein in a case where insertion paper is output to the paper sheet stacker and is placed on an uppermost paper sheet on the paper discharge tray, when it is determined that a size of the insertion paper is larger than a size of the uppermost paper sheet by a predetermined size determination value or more, the hardware processor executes insertion paper processing control for changing an outer shape of the insertion paper to change the size of the insertion paper and outputting the insertion paper to the paper sheet stacker.

A printer includes: a printing head; a conveyor; a cutter for cutting the medium to provide a segmented medium; a discharge roller; a counter roller; a sensor for detecting whether the segmented medium remains between the discharge roller and the counter roller; and a controller configured to perform: setting an operation mode to one of a first mode and a second mode depending on a medium kind; controlling the printing head and the conveyor to perform a first print control on the medium; controlling the sensor to detect whether the segmented medium has been removed; and permitting a second print control to be performed. When the operation mode is the first mode, the second print control is permitted after the sensor detects whether the segmented medium has been removed. When the operation mode is the first mode, the second print control is permitted without controlling the sensor.

A sheet conveying device includes a support configured to move between a storage position and a full open position and including a pair of rollers, a plurality of contact bodies, and a switching unit. The switching unit switches the pair of rollers in response to contact of the plurality of contact target bodies included in the switching unit, with the plurality of contact bodies. The plurality of contact bodies includes a first contact body closer to the storage position than the plurality of contact target bodies with the support at the full open position and closer to the full open position with the support at the storage position, and a second contact body closer to the storage position than a part of the plurality of contact target bodies with the support at a halfway position and closer to the full open position with the support at the storage position.

A conveying apparatus includes: a first roller and a second roller configured to convey a print sheet while nipping the print sheet at a nip pressure; an adjustor supporting the first roller and the second roller in a manner capable of adjusting an inter-axial distance between the first roller and the second roller, the adjustor being configured to apply a biasing force biasing the second roller toward the first roller and capable of adjusting the biasing force; and a controller configured to control the nip pressure by driving the adjustor to adjust the biasing force.

A printing apparatus capable of fixing a medium appropriately during printing is provided. The printing apparatus includes a feeding roller, a printing portion configured to make a print on the textile supplied from the feeding roller, and a conveyance portion configured to convey the textile to the printing portion. The conveyance portion includes a pressure roller configured to sandwich the textile and rotate along with conveyance of the textile. The printing apparatus further includes a brake roller disposed between the pressure roller and the feeding roller for producing force acting on the textile against conveyance force for the textile by the conveyance portion to apply tension to the textile between the brake roller and the pressure roller. Tension smaller than tension exerted on the textile between the brake roller and the pressure roller is exerted on the textile between the brake roller and the feeding roller.

A contact-separation mechanism includes a cam to rotate to move a contact-separation member to and from a counterpart member, a detection target to rotate together with the cam, and a detector to detect presence or absence of the detection target in a detection area of the detector, and circuitry. The cam has a reference range. The circuitry issues a rotation stop instruction of the cam after a target time elapses from passing of the reference range of the detection target through the detection area, and sets the target time based on a duration of an immediately preceding passing of the reference range through the detection area.

In at least one embodiment of this disclosure, there is provided an image reading apparatus that includes a reader, an upstream reading conveyance rotator pair, at least one upstream conveyance rotator pair, and an upstream separator. The reader reads a detection target image on a sheet. The upstream reading conveyance rotator pair is disposed upstream from the reader in a sheet conveyance direction to convey the sheet. The upstream conveyance rotator pair is disposed upstream from the upstream reading conveyance rotator pair in the sheet conveyance direction to convey the sheet toward the upstream reading conveyance rotator pair. The upstream separator causes one rotator of the upstream conveyance rotator pair to be contacted against and separated from another rotator of the upstream conveyance rotator pair.

A first roller pair disposed upstream of a second roller pair is separated from each other by a separating mechanism. A control portion is configured to start rotating the second roller pair after a leading edge of a sheet in a sheet conveyance direction is abutted against the second roller pair in a stopped condition. The control portion is configured to execute, based on the information concerning the sheet length acquired by the acquisition portion, either one of a plurality of modes including a first mode of rotating an upstream roller pair and the first roller pair to convey the sheet while the first roller pair is in a contact condition and a second mode of operating the separating mechanism to separate the first roller pair and of rotating the upstream roller pair to convey the sheet while the first roller pair is in a separated condition.

There is provided a sheet conveyance device that includes a first conveyance roller and a second conveyance roller that are arranged at a position other than a center in a direction of sheet width in a sheet conveyance path, a roller selector that selects the first conveyance roller or the second conveyance roller as a roller to convey a sheet, and a controller that causes the roller selector to select the first conveyance roller or the second conveyance roller. The first conveyance roller is made of a material that causes a speed of the sheet conveyed by the first conveyance roller in contact with the first conveyance roller to be higher than a rotation speed of the first conveyance roller. The second conveyance roller is made of a material that causes a speed of the sheet conveyed by the second conveyance roller in contact with the second conveyance roller to be lower than a rotation speed of the second conveyance roller.