A liquid ejecting apparatus includes an ejecting unit that ejects liquid when a drive signal is supplied to the ejecting unit, a drive signal output unit that outputs the drive signal, a cooling unit that cools the drive signal output unit, and a power supply unit that supplies power to the cooling unit. The liquid ejecting apparatus has a first mode in which the drive signal output unit outputs a first drive signal of a first frequency, and a second mode in which the drive signal output unit outputs a second drive signal of a second frequency lower than the first frequency. An amount of power supplied by the power supply unit to the cooling unit in the first mode is larger than an amount of power supplied by the power supply unit to the cooling unit in the second mode.

Provided is a printhead that performs printing by supplying a drive signal inputted to a second terminal to a drive element according to print data inputted to a first terminal, the printhead including: the first terminal; the second terminal; a determination circuit configured to perform based on different criteria, first determination to determine, in response to a first signal inputted to the first terminal, whether a potential of the second terminal is normal and second determination to determine, in response to a second signal inputted to the first terminal, whether the potential of the second terminal is normal; and a permission circuit configured to permit printing when the potential of the second terminal is determined to be normal in the first determination and second determination and does not permit printing when the potential of the second terminal is determined to be not normal in the first determination or second determination.

A drive circuit which drives a capacitive load on the basis of a drive signal output from a node includes a first wire; a second wire; an amplification unit; a capacitor and a resistance element; a determination unit which determines whether or not a voltage of a differentiated drive signal is within a predetermined range in case where a magnitude of a voltage change of the signal is less than or equal to a threshold; and a voltage output unit which amplifies the a voltage of the signal by a predetermined multiple, for example, one time, and outputs the amplified signal toward the node in a case where it is determined that the voltage of the differentiated drive signal is within the predetermined range.

A control system includes a control circuit. The control circuit is to be connected to a head unit including first driving elements and second driving elements. Based on an input print data, the control circuit applies a first signal to the first driving element and applies a second signal to the second driving elements. The control circuit changes the first signal to a third signal in a first time and changes the second signal to a fourth signal in a second time. Based on an input print data, the control circuit applies the third signal to the first driving element and applies the fourth signal to the second driving elements.

A drive circuit includes an amplification unit that amplifies a signal and outputs the amplified signal toward a node; and a voltage output unit that outputs a voltage responding to the signal toward the node during a predetermined period of a part or all of a period in which a magnitude of a voltage change of the signal is less than or equal to a threshold. The amplification unit includes a differential amplifier, a selector, and transistors, and the voltage output unit includes a linear amplifier and a switch.

An ink-jet recording apparatus includes a conveying unit, a recording head, a head housing, and a guide rail. The recording head includes an ink ejection surface provided with a plurality of nozzles which ejects ink toward the recording medium conveyed by the conveying unit. The head housing holds the recording head. The guide rail supports the head housing so that the head housing can reciprocate with respect to the conveying belt. The ink ejection surface is parallel to a conveying surface of the conveying belt. Moreover, the ink ejection surface is inclined with respect to a horizontal direction in a cross section orthogonal to an axial direction of the conveying roller. By moving the head housing along the guide rail extending in the horizontal direction, the ink ejection surface reciprocates between a printing position close to a conveying surface and a maintenance position retracted from the conveying surface.

A firing circuit for a thermal inkjet-printing nozzle includes a heater resistor and a switch. The heater resistor heats ink to cause the ink to be ejected from the nozzle. The heater resistor has a first end and a second end, the second end connected to a ground. The switch controls activation of the heater resistor. The switch has a first end connected to a voltage source and a second end connected to the first end of the heater resistor. The switch operates in a constant current mode, such that an at least substantially constant current flows through the heater resistor upon activation.

A printing system comprising a pen comprising a number of print bars; each print bar comprising a number of printheads in which the printheads are grouped to a number of printheads from each of the number or print bars, the grouped printheads forming a slice and in which the printheads of the slice are electrically coupled to a common power supply unit. A printing pen comprising a number of print bars in which each of the number of print bars comprises a number of printheads, in which the number of printheads are grouped together to form a slice, the slice comprising a printhead from each of the print bars, and in which the slice is powered by a common power supply unit.

A judgment device includes a residual capacity acquisition section adapted to obtain a remaining battery power of a battery as a power source of a printer, an arithmetic section adapted to calculate a predicted consuming capacity of the battery consumed by execution of a print job, and a judgment section adapted to judge whether or not the battery has the remaining battery power, with which the printer can complete the print job, based on the remaining battery power and the predicted consuming capacity.

An inkjet recording apparatus includes: a conveyance belt; a recording head that includes a pressurized chamber which stores an ink, a nozzle which communicates with the pressurized chamber and a displacement element which applies a pressure to the pressurized chamber to discharge the ink; and a control unit, the conveyance belt includes a flushing region, the control unit causes the recording head to perform flushing processing that discharges the ink to an opening in the flushing region and the control unit controls the application of a voltage to the displacement element such that the flying speed of the ink discharged during the flushing processing is faster than the flying speed of the ink discharged during image formation processing.