An inkjet recording apparatus includes a conveying unit, a recording unit, a heat source, a heat source moving unit and a heat source moving control unit. The conveying unit performs a conveying operation to move a conveying member thereby conveying a recording medium placed on a conveying surface of the conveying member. The recording unit records an image by ejecting ink to the recording medium conveyed by the conveying unit. The heat source moving unit moves the heat source. The heat source moving control unit moves the heat source by the heat source moving unit such that a distance between the heat source and the conveying surface increases when the conveying operation which is performed by the conveying unit stops in a manner in which the conveying operation can be resumed in a state where the heat source is positioned in proximity of the conveying surface.

A fluid dispensing method, the method comprising steps of: providing a system comprising a reservoir, a micro-fluidic thermal inkjet print head in fluid communication with the reservoir, a controller and a power source in electrical communication with the controller and the print head, the reservoir containing a fluid, the micro-fluidic thermal inkjet print head comprising nozzles; heating the fluid in the microfluidic device to a temperature of about 40 C to 75 C in less than about 1000 ms; activating the print head to fire the nozzles about 200 fires/nozzle at a first frequency; subsequent to step c, activating the print head to fire the nozzles at a second frequency, the second frequency substantially less than the first frequency; and subsequent to step d, activating the print head to fire the nozzles at a third frequency substantially greater than the first frequency.

A recording apparatus that performs recording on a recording medium includes a low temperature marker that, depending on a change in temperature, changes a color state to a low-temperature first color state or to a low-temperature second color state different from the low-temperature first color state, and a surface on which the low temperature marker is disposed. The low temperature marker has a characteristic of indicating the low-temperature second color state when a temperature of the low temperature marker is higher than at least the low-temperature first threshold temperature after reached a temperature lower than or equal to a low-temperature first threshold temperature from an initial state indicating the low temperature first color state.

A liquid discharge head control circuit includes a first wiring for propagating a first reference voltage signal to be supplied to a driving signal selection circuit, a second wiring for propagating a second reference voltage signal to be supplied to a restoration circuit, a third wiring for propagating the second reference voltage signal to be supplied to the restoration circuit, a fourth wiring for propagating one signal of a pair of first differential signals, and a fifth wiring for propagating the other signal of a pair of first differential signals. The fourth wiring and the fifth wiring are arranged side by side. The fourth wiring and the second wiring are located to be adjacent to each other, the fifth wiring and the third wiring are located to be adjacent to each other, and the fourth wiring and the fifth wiring are located between the second wiring and the third wiring.

Examples herein provide a method. The method includes preconditioning a printing apparatus, including: increasing a temperature of an inkjet printhead in a print zone in the printing apparatus to a first temperature higher than or equal to about a steady state printhead temperature; and increasing a temperature of the print zone such that a portion of a print medium disposed over a portion of a platen in the print zone is at a second temperature higher than or equal to about a steady state print zone temperature. The method further includes disposing, using the printhead, an ink at the steady state printhead temperature onto the portion of the print medium to form an image thereon.

A printing apparatus receives, as serial data, a plurality of commands for driving a printhead including arrayed print elements to perform printing. Then, a first signal is internally generated in the apparatus, and a second signal is generated based on the position of a conveyed print medium. In addition, each command is extracted from the received serial data. While switching over the first and second signals based on each command, the printhead is driven to perform a preparation operation prior to image printing by the printhead based on the first signal and to print an image based on image data on the print medium based on the second signal. Upon switchover of the first signal to the second signal, switchover to the second signal is controlled after disabling the first signal for a predetermined period.

An inkjet recording apparatus ejects an ink droplet from a recording head to record an image on a recording medium, and includes: a heat source that heats the recording head; a temperature sensor that detects a temperature of the recording head; a carriage to which the recording head is attached; and a hardware processor that makes determination on whether there is a mechanical defect in attaching the recording head to the carriage on the basis of transition of the temperature detected by the temperature sensor at a time when the heat source heats the recording head.

A fluid ejection device including a plurality of primitives each having a same set of addresses and including a plurality of fluid chambers, each fluid chamber corresponding to a different address of the set of addresses and including a firing mechanism. Input logic receives a series of fire pulse groups, each fire pulse group corresponding to an address of the set of addresses and including warming data having an enable value or a disable value and a series of firing bits, each firing bit corresponding to a different primitive and having a firing value or a non-firing value. For each firing bit of each fire pulse group, when the warming data has the enable value, activation logic provides a warming pulse to the firing mechanism of the fluid chamber corresponding to the firing bit when the firing bit has the non-firing value.

Ink in a print head is heated to a target temperature by driving heating elements included in a print head. After heating control is completed, operation that is performed using power stored in a power storage unit is started. The target temperature in the heating control is determined in such a manner that the temperature of the print head when the operation is started is a set temperature or higher.

In a method of controlling a property of liquid droplets, the droplets are ejected from a jetting device having an array of ejection units, each of which comprises a cavity connected to a nozzle and an actuator associated with the cavity for exciting a pressure wave in the liquid in the cavity. The method includes monitoring a sub-threshold pressure wave oscillating in the cavity, but having an amplitude not large enough for jetting-out a droplet, deriving an indicator for the viscosity of the liquid from the behavior of the sub-threshold pressure wave, and adjusting a setting of the jetting device on the basis of the indicator. The method also includes keeping the array of ejection units at a reference temperature, establishing a reference profile, and establishing an operation profile of the indicator. The setting is adjusted on the basis of a difference between the operation profile and the reference profile, thus eliminating non-temperature related differences between the ejection units.