According to some examples, a skew detection device comprises a first roller rotatable around a first axis, a second roller rotatable around a second axis, a first sensor, and a second sensor. The first sensor measures a first rotation parameter from the first roller and the second sensor measures a second rotation parameter from the second roller. A movement of a print media over the device rotates the first contact roller and the second roller, and a controller determines a skew of the print media based on the first and second rotation parameters captured by the first sensor and the second sensor.

A liquid ejecting apparatus includes a plurality of ejection heads, each including a nozzle array in which a plurality of nozzles, each configured to eject a droplet, are arranged in an array; and an ejection receiver configured to receive the droplet from the plurality of ejection heads. A conveying direction in which an ejection target medium is conveyed and an arrangement direction in which the nozzle array is arranged are parallel to each other, and at a predetermined timing, at least one ejection head among the plurality of ejection heads moves to a position facing the ejection target medium and ejects the droplet toward the ejection target medium, and, simultaneously, a remaining ejection head among the plurality of ejection heads other than the at least one ejection head moves to be withdrawn from the position facing the ejection target medium and ejects the droplet toward the ejection receiver.

A digital printing system (10) includes a flexible substrate (44), an optical assembly (200, 301) and a processor (20). The flexible substrate (44) has a periodic pattern, and is configured to be moved and to receive ink droplets in a printing process that forms an image thereon. The optical assembly (200, 301) is configured to illuminate the flexible substrate (44) with light (215, 315), to detect the light (215, 315) from the flexible substrate (44), and to derive from the detected light (215, 315) a signal indicative of the periodic pattern. The processor (20) is configured to receive the signal and to monitor or control the digital printing system (10) based on the periodic pattern as indicated by the signal.

The invention relates to a print system comprising at least two page-wide arrays of ink jet print heads, positioned in a frame over a conveyor belt for transporting a substrate underneath the arrays, three sensors for reading markers on the conveyor belt and a control unit that is configured to derive control signals from encoder signals of the three sensors. Two sensors are directly connected to the frame and a third sensor is connected to one of the said two sensors by an element with virtually no thermal expansion, extending in transport direction. The control signals, comprising signals for controlling a transport speed of the conveyor belt and line pulses for the at least two print heads, are derived in such a way that an amount of thermal expansion of the frame is determined and an absolute print resolution is maintained.

Printing apparatus (20) includes a continuous blanket (24) and a set of motorized rollers (31), which advance the blanket at constant speed through an image area. Print bars (38) eject droplets of ink at respective locations onto the blanket in the image area. Monitoring rollers (42), in proximity to the locations of the print bars, contact the blanket to be rotated by blanket advancement. Each monitoring roller includes an encoder (44), which outputs a signal indicative of a rotation angle of the monitoring roller. A control unit (40) collects, during a calibration phase, the signal from the encoders over multiple rotations of the monitoring rollers, detects a deviation of the signal from the encoder relative to a clock signal having a predefined frequency, and computes runout correction factors. During an operational phase, the control unit applies the runout correction factors to synchronize the droplets ejection from the print bars.

There is provided an image recording apparatus including: a conveyer; a carriage; a recording head; a memory; and a controller. The controller is configured to cause the conveyer to convey a recording medium in a conveyance direction such that dot recording ranges are partially overlapped with each other in the conveying operation. In a case that a predetermined condition is fulfilled, the controller is configured to cause the recording head to record a dot including a correcting portion by correcting discharge, and in a case that the predetermined condition is not fulfilled, the controller is configured to cause the recording head to record the dot including the correcting portion by ordinary discharge.

There is provided a printing apparatus which includes the following: A printhead including a plurality of nozzles that discharge ink to a print medium. A first detection unit that detects a distance between the printhead and a platen. An adjustment unit that adjusts the distance between the printhead and the platen. An acquisition unit that acquires difference information concerning a difference of a distance between the platen and each of the nozzle on an upstream side and the nozzle on a downstream side in a conveyance direction of the print medium. The adjustment unit adjusts the distance based on a detection result of the first detection unit and the difference information acquired by the acquisition unit.

Disclosed are an inkjet print system and an inkjet printing method using the same. An inkjet print system according to one embodiment of the disclosure may include a stage on which a printing medium is loaded and which moves the printing medium in a first direction, an inkjet head which moves in a second direction perpendicular to the first direction and in which a plurality of nozzles configured to eject an ink on the printing medium are formed, a measurement instrument which moves in the second direction independent of the inkjet head and measures a height for each section of an impacted coating layer on the printing medium, and a processor which allows the nozzles to be opened or closed on the basis of height information of the coating layer.

This inkjet printing device comprises a conveyance path by which a sheet to be assembled as a corrugated cardboard box having a plurality of walls is conveyed in a conveyance direction, and inkjet heads that are positioned facing the surface of the sheet in the conveyance path and that can print a printed pattern in predetermined print ranges of an intersecting direction that intersects the conveyance direction along the surface of the sheet. The inkjet heads are positioned so that the print ranges span between first regions, which are intended to be first walls when the sheet is assembled into a corrugated cardboard box, and second regions, which are adjacent to the first regions in the intersecting direction and are intended to be second walls separate from the first walls.

A printing apparatus includes: a conveying roller which conveys a print medium in a conveying direction; a line head having first and second nozzle rows arranged in the conveying direction; and a controller. Each of the first and second nozzle rows includes nozzles aligned along a width direction orthogonal to the conveying direction. The nozzles are configured to discharge liquid, and the nozzles in the first nozzle row and the nozzles in the second nozzle row are shifted in the width direction. The first nozzle row has: first nozzles forming a group; and second nozzles forming a group adjacently in the width direction to the group of first nozzles in the first nozzle row. The second nozzle row has: first nozzles forming a group; and second nozzles forming a group adjacently in the width direction to the group of first nozzles in the second nozzle row.