A liquid discharge apparatus includes a conveyance roller, a liquid discharge head, and a control device. The control device controls the head to discharge liquid onto a medium X times in the main scanning direction and Y times in the sub-scanning direction and controls the roller such that a position of a droplet on the medium discharged by an m-th discharge and a position of another droplet on the medium discharged by an (m+Y)-th discharge are same in the sub-scanning direction, where m is an integer not smaller than one and not greater than ((X−1)×Y). Where P is a circumferential length of the roller and L is a difference in a conveyance distance in the sub-scanning direction when the m-th discharge is compared with the (m+Y)-th discharge, the following relation is satisfied:
L=(n+(Δθ/2π))×P, where |π−Δθ|<60° and n is an integer.

In one example, a wedge shaped carriage to carry a printhead back and forth over a print substrate during printing.

A printing apparatus prints an image by applying ink to a print surface of an inclined print medium using a print head. A control apparatus for the printing apparatus acquires information on an inclination of the print surface. Based on the information, printing is controlled according to a print condition corresponding to a magnitude of the inclination of the print surface.

An ink jet system includes a head unit that includes a nozzle discharging ink, a pressure chamber communicating with the nozzle, and a drive element applying pressure fluctuation to the ink in the pressure chamber by supplying a drive pulse, an acquisition portion that acquires output information including first output information regarding the head unit and/or second output information regarding the ink used for the head unit, a first coupling portion that is communicably network-coupled to a server, a first output portion that outputs the output information to the server via the first coupling portion, a first input portion to which input information is input from the server via the first coupling portion, and a determination portion that determines the number of times of scanning or a scanning direction of the head unit with respect to a unit region on a medium based on the input information.

A printing apparatus is provided with a print head having at least a first type nozzles and a second type nozzles positioned on a first direction side with respect to the first type of nozzles and a controller. The controller is configured to perform a first ejection control with performing a main scanning. The first ejection control includes a control of performing flushing when the print head is in a first state where the second type of nozzles are located at a position corresponding to an ink receiver and the first type of nozzles are located at a position corresponding to the medium range, and a control of causing the first type nozzles to eject the ink toward the printing medium during a period where the ink is ejected from the second type of nozzles toward the ink receiver when the print head is in the first state.

An inkjet printing machine includes a controller and performs margin-less printing on a base material on the basis of image data having a size larger than that of the base material by discharging ink from an inkjet head while relatively moving the base material and the inkjet head for one cycle of reciprocation or more in a main-scanning direction. On the basis of the image data, the controller controls the inkjet head to stop discharging ink, when the inkjet head is moved from the outside toward an end of the base material. The controller controls, when the inkjet head is moved from the inside toward the end of the base material, the inkjet head to discharge ink to complement an image in a section where the inkjet head stops discharging ink.

According to an example, multi-directional single pass printing may include utilizing a print head that includes slots that include a first slot for a first ink color, and two or more additional slots. A slot of the additional slots may be disposed on a first side of the first slot, and another slot of the additional slots may be disposed on a second side of the first slot. The additional slots may include a further ink color. Data may be forwarded to a set of slots when a direction bit related to the print head is set to a first value, and to another set of slots when the direction bit is set to a second value. A number of channels for forwarding the data to the slots may be less than the number of slots.

Provided are a painting robot system that may perform painting well not only on a forward path but also on a backward path, and a painting method. An image processing portion (210) included in a painting robot system (11) creates image data for a forward path in a state of having first strip image data of a strip shape corresponding to nozzles (54A) in a first nozzle column (55A) and second strip image data of a strip shape corresponding to nozzles (54B) in a second nozzle column (55B), the image processing portion (210) creates the second strip image data as image data for a backward path in a state of deviating relative to the first strip image data, and the amount of position deviation is set as the following position: the Pth nozzle (54B) in the second nozzle column (54B) lands first relative to the Pth nozzle (54A) in the first nozzle column (54A) with an adjacent landing position at a distance of multiplying the number (N) by twice of the distance (L1).

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.

In a printing apparatus configured to print an image by bidirectional multipass printing while using multiple print element rows that apply color material of the same color, a high-quality image suppressed in hue unevenness and density unevenness is printed. To this end, the printing apparatus forms first and second dot patterns on a print medium in an overlapping manner. In the first dot pattern, dot arrays in which first dot groups are arranged at an interval B1 are arranged in a nozzle arrangement direction while being shifted from each other by C1 in a scanning direction of a print head. In the second dot pattern, dot arrays in which the first dot groups are arranged at the interval B1 are arranged in a nozzle arrangement direction while being shifted from each other by C2 in the scanning direction of the print head. Here, values of C1 and C2 are different.