To provide an inkjet printing apparatus capable of continuing printing even during speed change of web paper WP, a transport controller of this invention controls drive rollers, and to make constant at each point of time during the speed change of the drive rollers, a speed difference which is a difference between a first speed which is a transporting speed of web paper when the upstream nozzle dispenses an ink droplet and a second speed which is a transporting speed of web paper when a downstream nozzle dispenses an ink droplet. In this way, a constant relationship is realized, at each point of time during the speed change of drive rollers, between a landing position on the web paper of the ink droplet relating to the upstream nozzle and a landing position on the web paper of the ink droplet relating to the downstream nozzle.

A sheet detection device includes a sheet guide disposed between a sheet feeding opening into which a sheet is inserted and a printing mechanism of printing on the sheet, the sheet guide including a guide surface through which the sheet passes, a sheet detector including an optical sensor that detects a predetermined position of the sheet, an opening formed in the guide surface, the sheet detector being disposed inside the opening and the optical sensor being exposed through the opening, and a transparent guide cover provided in the guide surface to cover at least a first border position between the sheet detector and the opening on an upstream side in a sheet transport direction.

A printer includes: a conveyor that performs a forward-conveyance operation for conveying a printing medium downstream in a conveying direction and a backward-conveyance operation for conveying the printing medium upstream in the conveying direction; a printing device; a roller provided downstream of the conveyor in the conveying direction; an opposed member opposed to the roller; a moving mechanism that moves a moving member, which is one of the roller and the opposed member, between (i) a first position at which the printing medium is nipped between the moving member and the other of the roller and the opposed member and (ii) a second position at which the moving member is separated from the printing medium; and a controller that executes a first conveyor-backward-conveyance processing for controlling the conveyor to perform the backward-conveyance operation in a state in which the moving member is located at the second position.

A recording system that when formation of the image is restarted after a temporal stop of the formation of the image by temporarily stopping the conveyance of the recording target medium by the first conveyance unit and the discharging of the ink from the discharging part, a distance from a first position to a recording restart position is an integer multiple of image formation pitch, the first position being based on a position, at the time of the temporal stop, of the image that is formed on the recording target medium before the temporal stop, the recording restart position being a position where the ink is discharged at the time of the restart; and performing the post-processing on the recording target medium at the post-processing unit each time the recording target medium is conveyed, by the second conveyance unit, a distance corresponding to the image formation pitch.

A printer includes: a conveyor conveying a sheet in a conveying direction; a first supporting part positioned on an upstream side in the conveying direction with respect to the conveyor, and having a first supporting surface; a side guide making contact with at least one of both ends, in a width direction of the sheet, in the first supporting surface, the width direction being orthogonal to the conveying direction and parallel to the first supporting surface; a suction-attraction force generator generating a suction-attraction force in an area, in the first supporting surface, which is adjacent to the side guide and in which the sheet passes; a second supporting part positioned on a downstream side in the conveying direction with respect to the conveyor, and having a second supporting surface; and a recording part recording an image on the sheet supported by the second supporting surface.

A liquid ejection apparatus is provided that includes a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object being conveyed; a detection unit that is provided with respect to each liquid ejection head unit of the plurality of liquid ejection head units and is configured to output a detection result indicating at least one of a position, a moving speed, and an amount of movement of the conveyed object with respect to a conveying direction of the conveyed object; and a control unit configured to control each liquid ejection head unit among the plurality of liquid ejection head units to eject liquid at a timing based on a plurality of the detection results of a plurality of the detection units.

A web handling apparatus is disclosed. The web handling apparatus includes a first web guide to engage a print medium, a second web guide to engage the print medium to adjust a contact area between the first web guide and the print medium upon moving between a plurality of points on a guide path and a third web guide to engage the print medium to form a web path with the first web guide.

A printer includes a rolled paper holder that accommodates rolled paper wound with recording paper having a recording surface and an adhesive surface provided on a side opposite to the recording surface, a platen roller that comes into contact with the adhesive surface and draws and feeds the recording paper from the rolled paper, a thermal head that performs printing on the recording surface, and a first guide portion that comes into contact with the recording surface and guides the recording paper, and the first guide portion has a first friction reduction portion that reduces a friction force generated between the recording surface and the first guide portion.

There is provided a printing apparatus including: a recorder; first and second conveying rollers; a first member which includes the first conveying roller and in which the first conveying roller is supported shakably; and a second member which includes the second conveying roller. The first member includes: a roller support having: an extending part which extends in an extending direction of a rotation shaft of the first conveying roller, and first and second supports which rotatably supports first and second ends of the rotation shaft of the first conveying roller, respectively; and at least one pressing part configured to press a central area of the extending part in a pressing direction extending from the first conveying roller to the second extending roller, in a state that the first and second conveying rollers are brought into contact with each other.

A printer device includes a main housing including a print media cassette receiving slot. A first drive assembly of the main housing includes a motor operatively coupled to rotate a drive gear. A print media cassette is removably inserted into the print media cassette receiving slot, and includes a second drive assembly having a driven gear that is engaged with the drive gear. One of the drive gear or the driven gear is mounted for movement such that at least one of (i) a position of an axis of the drive gear is movable relative to the main housing or (ii) a position of an axis of the driven gear is movable relative to the printer cassette. A retaining mechanism includes a portion movable into a gear train coupling position in which the drive gear and the driven gear are held in driving contact with each other.