An object is to print a high quality image with resistance to print misalignment. To this end, the image processing apparatus generates quantized data for printing a first dot pattern and a second dot pattern in an overlapping manner. The first dot pattern and the second dot pattern are lattice patterns varying in a combination of two basis vectors. In a combined dot pattern obtained by combining the first and second dot patterns, there is a neighboring dot in which a dot in the first dot pattern and a dot in the second dot pattern are arranged at an interval smaller than a lattice spacing. The neighboring dot includes multiple neighboring dots varying in an approach direction.

A printing apparatus includes a transporting device that transports a medium and a printing unit that prints onto the medium. In addition, the printing apparatus includes an image sensor that images the medium and a controller that detects a displacement amount of the medium in an intersecting direction which intersects a surface to be printed of the medium based on a plurality of images obtained by imaging the medium by the sensor at different times and that controls the transporting device and the printing unit according to the displacement amount.

A printed matter creating device includes a controller configured to: acquire print data; form a first print on a printing medium while conveying the printing medium, the first print being based on first ON dots in the acquired print data; interrupt the conveyance of the printing medium after forming the first print; cut the printing medium after interrupting the conveyance; and form a second print on the printing medium while conveying the printing medium after cutting the printing medium, the second print being based on second ON dots in the acquired print data. The print data includes a specific print data corresponding to a connecting part connecting the first print and the second print. Based on the acquired print data, the controller adjusts at least one of: aspects of the first ON dots in the specific print data; and aspects of the second ON dots in the specific print data.

A sheet processing apparatus including a controller configured to move a carriage from an initial position to such a position that an optical sensor traverses one of two side edges of a sheet in a scanning direction, in a direction along the scanning direction, in response to the sheet reaching a position opposed to the optical sensor, adjust a light emitting quantity of the optical sensor while the carriage is being moved, within a period from when the carriage begins to move from the initial position to when the optical sensor traverses the one side edge, calculate a position of the one side edge traversed by the optical sensor after the adjustment, based on detection values, corresponding to the light receiving quantity, output from the optical sensor after the adjustment, and identify edge positions of the two side edges based on the calculated position of the one side edge.

A controller determines the amount of driving by a sub-scanning driver and the number of nozzles to be used in accordance with a maximum amplitude of vibration of an inkjet head in a sub-scanning direction, where the maximum amplitude is detected by a displacement detecting sensor when the inkjet head is moved in the sub-scanning direction before starting printing. Then, while moving the inkjet head in a main-scanning direction, the controller performs printing by selecting nozzles to be used in accordance with displacement of the inkjet head in the sub-scanning direction detected by the displacement detecting sensor.

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 the each liquid ejection head unit of 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 control method for a printing apparatus includes: an image defect detecting step of detecting an ejection curve amount of a nozzle in an inkjet head and an image defect from a recordable medium on a surface of which an image is recorded by an image recording part provided with the inkjet head having a plurality of nozzles, and a stamp step of attaching a stamp indicating presence of the image defect on the recordable medium by a stamping device in a case where the image defect is detected, the stamp step differentiating an attachment form of the stamp by the stamping device in accordance with a magnitude of the ejection curve amount of the nozzle.

A head unit includes: a base extended in a first direction; a first head which is fixed to the base and includes a first nozzle plate; a second head which is fixed to the base, includes a second nozzle plate, and is configured to form dots in a line in the first direction with the first head; a first corrector configured to adjust arrangement of the first head with respect to the base, and disposed at a first side in a second direction orthogonal to the first direction with respect to the first head; and a second corrector configured to adjust arrangement of the second head with respect to the base, and disposed at a second side opposite to the first side in the second direction with respect to the second head. The first and second nozzle plates are disposed between the first and second correctors in the second direction.

In an inkjet printer, a controller is configured to calculate, during movement of a carriage in a scanning direction, a signal level difference between a first detection signal in a mountain peak zone including an assumed mountain peak position and the first detection signal in a valley bottom zone including an assumed valley bottom position identified, based on information stored in a storage, and alternately execute, during the movement of the carriage, an ejection process of ejecting ink drops, and a conveying process of conveying the sheet by a predetermined line feed width. In the printing process, the printing head and the conveyor are driven according to a first condition when the signal level difference is equal to or larger than a threshold value, while driven according to a second condition when the signal level difference is less than the threshold value.

In a printing apparatus including a printhead and a print control unit, wherein the printhead includes two nozzle arrays, each arranged in a first direction and including nozzles arranged along a second direction, the print control unit performs a first operation of expanding print data onto a memory, a second operation of selecting, for each nozzle array, some of the nozzles as non-driving nozzles and the remaining nozzles as driving nozzles, and a third operation of distributing the expanded print data to the two nozzle arrays such that dots corresponding to the non-driving nozzles of one nozzle array are printed by the driving nozzles of the other nozzle array.