Abstract: Systems and methods are provided for printhead waveform adjustment. One embodiment is a system that includes a controller that correlates a series of printhead waveforms input to a printhead with a series of optical density values output by the printhead. The controller determines a single target optical density for the printheads based on an average optical density of the printheads. Also, for each of the printheads, the controller determines a functional relationship between the parameter of the printhead waveforms input to the printhead and the optical density values output by the printhead, and determines a target printhead waveform parameter for the printhead based on the single target optical density input to an inverse of the functional relationship. The controller updates printhead settings to include information of the target printhead waveform parameter determined for each of the printheads for applying to the printheads to output ink at consistent optical density.

Abstract: An image forming apparatus includes a liquid discharge head including a plurality of nozzles discharging liquid droplets; a discharge failure detection unit detecting a defective nozzle of the liquid discharge head, the defective nozzle having a discharge failure; and a notification unit giving, when the defective nozzle is detected during image formation, a notification of the possibility of the generation of an image failure at least one of during and after the image formation.

Abstract: An image forming apparatus includes a liquid discharge head including a plurality of nozzles discharging liquid droplets; a discharge failure detection unit detecting a defective nozzle of the liquid discharge head, the defective nozzle having a discharge failure; and a notification unit giving, when the defective nozzle is detected during image formation, a notification of the possibility of the generation of an image failure at least one of during and after the image formation.

Abstract: An inkjet recording apparatus includes a droplet ejection head, a head tank, a tube, an ink cartridge, and a liquid-feed pump. The droplet ejection head has a plurality of nozzles for ejecting ink. The head tank is mounted on the droplet ejection head, temporarily stores a certain amount of ink, and creates negative pressure in the droplet ejection head. The tube is connected to the head tank. The ink cartridge is connected via the tube to the head tank, the ink cartridge storing ink. The liquid-feed pump is disposed at the tube between the ink cartridge and the head tank to feed ink from the ink cartridge to the head tank through the tube. The liquid-feed pump is operable in reverse to feed ink from the head tank through the tube to the ink cartridge and create negative pressure in the head tank.

Abstract: An inkjet recording apparatus includes a droplet ejection head, a head tank, a tube, an ink cartridge, and a liquid-feed pump. The droplet ejection head has a plurality of nozzles for ejecting ink. The head tank is mounted on the droplet ejection head, temporarily stores a certain amount of ink, and creates negative pressure in the droplet ejection head. The tube is connected to the head tank. The ink cartridge is connected via the tube to the head tank, the ink cartridge storing ink. The liquid-feed pump is disposed at the tube between the ink cartridge and the head tank to feed ink from the ink cartridge to the head tank through the tube. The liquid-feed pump is operable in reverse to feed ink from the head tank through the tube to the ink cartridge and create negative pressure in the head tank.