A droplet discharge apparatus may include a droplet discharge unit configured to discharge droplets of a target substance stored in a tank at intervals through an opening of a nozzle connected to the tank, a speed sensor configured to measure the speed of a droplet discharged from the droplet discharge unit, and a calculation unit configured to calculate the volume of the target substance consumed per unit time, based on cross-sectional area of the opening of the nozzle and the speed of the droplet.

A printing apparatus for printing using a printhead including a plurality of nozzles, each configured to discharge ink, and a plurality of sensors, corresponding to the plurality of nozzles, for detecting a discharge state of ink from the plurality of nozzles, judges a discharge state. The apparatus prints, based on print data, an image by driving the printhead under a first drive condition to discharge the ink from the printhead to a first area, discharges ink to a second area different from the first area by driving the printhead, based on inspection data, under a second drive condition different from the first drive condition, and judges a discharge state of each nozzle by monitoring an output from each sensor at a timing of driving the printhead under the second drive condition.

An inspection module is disclosed for inspecting a droplet from an ink jet head. The inspection module includes a sensor located under the ink jet head and measuring a distance between the droplet and the sensor in real time; a variable lens changing an operating distance based on the measured distance of the sensor; and a camera for capturing an image of the droplet. The inspection module further includes a droplet inspecting part inspecting the droplet image captured by the camera.

An image-recording apparatus includes a cartridge including a first storage chamber, a tank including a second storage chamber, a recording portion, a detected portion, a detector, and a wall portion. Liquid supplied from the first storage chamber to the second storage chamber through an inlet port is supplied from the second storage chamber to the recording portion through an outlet port. The wall portion partitions an internal space of the second storage chamber into a first region including the liquid inlet port and a second region including the detected portion. The wall portion extends upward than the liquid inlet port and the detected portion and downward than the liquid inlet port and the detected portion. Communication between the first region and the second region is allowed through upper and lower communication portions. The upper communication portion is positioned upward than the liquid inlet port and the detected portion.

A method of inkjet printing includes the steps of: feeding print media past a printhead; printing onto the print media via a stream of inkjet droplets ejected from the printhead; and generating a jet flow in the vicinity of the stream of inkjet droplets, wherein the jet flow is digitally controlled.

An example method is disclosed of adjusting a print head parameter, the method comprising ejecting a print agent drop from a print head, determining a velocity of the print agent drop, and adjusting the print head parameter based on the velocity of the print agent drop wherein the print head parameter is a number of drops of print agent in an area and/or a density of print agent applied by the print head.

There is provided a liquid discharge apparatus including: a liquid discharge head; a relative movement mechanism performing relative movement between the liquid discharge head and a medium; a velocity signal output circuit; and a controller performing a constant velocity discharge operation and an acceleration/deceleration discharge operation. In the constant velocity discharge operation, the controller determines a discharge timing based on information about a representative value of relative velocity obtained based on a plurality of pieces of preceding velocity information. Further, in the acceleration/deceleration discharge operation, the controller obtains approximate information in which a change in the relative velocity is approximated based on distribution of the relative velocity, and the controller determines a discharge timing based on the approximate information.

A print assembly includes: a printhead having a plurality of inkjet nozzle devices; and an array of synthetic jet devices configured to provide a jet flow in a vicinity of ink droplets ejected by the inkjet nozzles.

In an example implementation, a method of reducing inkjet aerosol in a fluid drop ejection system includes imaging fluid drops from an ejection event as the drops travel from an ejection nozzle toward a substrate, determining the momentum of each fluid drop from the imaging, comparing the momentum of each fluid drop with a threshold momentum, and determining that a fluid drop will become aerosol when its momentum does not exceed the threshold momentum.

Provided is a droplet discharging device capable of, while suppressing influence on a droplet discharge mode of a discharging head, suppressing heat generation of a head driving circuit for driving the discharging head. A printing apparatus (10) (droplet discharging device) includes a discharging head (54) configured to discharge ink, a head driving circuit (56) configured to drive the discharging head (54), a heat dissipation unit (57) configured to dissipate heat generated in the head driving circuit (56), a carriage (52) configured to move in a state of supporting the discharging head (54), the head driving circuit (56), and the heat dissipation unit (57), and at least one air blowing unit (60) disposed outside a movement region of the carriage (52) and capable of generating an airflow toward the heat dissipation unit (57) supported by the carriage (52).