A printing apparatus includes: power supply circuits including at least first and second power supply circuits; a head including nozzles, the nozzles forming groups arranged in a first direction, each of the groups including nozzle arrays arranged in the first direction, each of the nozzle arrays extending in a second direction intersecting with the first direction, and each of the nozzles being associated with any of the power supply circuits; and a memory storing information. The information indicates correspondence relationships between the nozzles and the power supply circuits, between the nozzles and the groups, and between the nozzles and the nozzle arrays. Printing is performed by driving the head based on the information. The groups include a first group and a second group adjacent to each other in the first direction. The first group includes a first nozzle array adjacent to the second group in the first direction.

A drive circuit for driving a first drive element having a first terminal and a second terminal and driving a second drive element having a third terminal and a fourth terminal, includes a first drive signal output circuit that is electrically coupled to the first terminal and outputs a first drive signal, a second drive signal output circuit that is electrically coupled to the third terminal and outputs a second drive signal, a reference voltage signal output circuit that outputs a reference voltage signal having a constant reference voltage value, and a first switch circuit having one end electrically coupled to an output terminal of the reference voltage signal output circuit and the other end electrically coupled to the second terminal and the fourth terminal. The first switch circuit switches whether or not to supply a second constant voltage signal to the second terminal and the fourth terminal.

A liquid ejection device includes: a casing; a holder for rotatably supporting a sheet roll including a continuous sheet; a power transmission mechanism positioned beside the holder for transmitting rotational driving force thereto; a cartridge attachment portion positioned above the power transmission mechanism; a conveying mechanism for conveying the continuous sheet to a discharge opening of the casing; and a head for ejecting liquid to the continuous sheet. The holder supporting the sheet roll is rotatable about a rotation axis extending in a leftward/rightward direction. A cartridge is attachable to the cartridge attachment portion. An occupying range of the cartridge attachment portion is overlapped with an occupying range of the power transmission mechanism and outside of an occupying range of the sheet roll and the holder in the leftward/rightward direction. The holder and the cartridge are attachable to and detachable from the casing through an opening thereof.

A drop ejector array device includes a first plurality and a second plurality of drop ejectors that are alternatingly disposed along an array direction on the substrate surface. A voltage input terminal and a current return terminal are disposed on the substrate surface. A first power bus line connects the first plurality to the voltage input terminal. A second power bus line connects the second plurality to the voltage input terminal. The second power bus line is electrically connected to the first power bus line by a primary power bus connector line. A first current return bus line connects the first plurality to the current return terminal. A second current return bus line connects the second plurality to the current return terminal. The second current return bus line is electrically connected to the first current return bus line by a primary current return bus connector line.

In example implementations, an apparatus is provided. The apparatus includes a power supply, a first switch coupled, a second switch, and a second resistor. The first switch is coupled to the power supply and a low voltage control block. The second switch is coupled to the power supply and the first switch. The second resistor is coupled to the second switch to generate heat in response to being energized. The first switch is to control activation of the second switch via a fire signal from the low voltage control block and through the first resistor to energize the second resistor and cause a nozzle chamber to dispense a printing fluid.

A driving circuit includes an amplification circuit configured to output an amplified modulation signal and a level shift circuit. The level shift circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor that operates based on the third gate signal, and a fourth transistor that operates based on the fourth gate signal. The second gate driver outputs the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive in a second period in which a driving signal is fixed in a second potential that is higher than a first potential and lower than a third potential and the fourth gate signal for controlling the fourth transistor to be nonconductive.

There is disclosed a method of supplying an n-channel transistor, operating as a voltage regulator, with a supply voltage and providing a control voltage to the n-channel transistor. The n-channel transistor is controlled by the control voltage to output an operating voltage of a printhead at a predetermined voltage.

A fluidic die may include an array of fluid actuators, an actuation data register to store actuation data that indicates each fluid actuator to actuate for a set of actuation events, a mask register to store mask data that indicates a set of fluid actuators of the array enabled for actuation for a respective actuation event of the set of actuation events, a pattern select register to store a pattern selection, input mask data generation circuitry to build a set of mask data with subsets of mask data, each of the subsets having a pattern based upon a pattern selection input, and to populate the mask register with the set of mask data, and actuation logic to electrically actuate a subset of the fluid actuators based at least in part on the actuation data register and the mask register for the respective actuation event.

A liquid ejection device includes: a casing; a holder for rotatably supporting a sheet roll including a continuous sheet; a power transmission mechanism positioned beside the holder for transmitting rotational driving force thereto; a cartridge attachment portion positioned above the power transmission mechanism; a conveying mechanism for conveying the continuous sheet to a discharge opening of the casing; and a head for ejecting liquid to the continuous sheet. The holder supporting the sheet roll is rotatable about a rotation axis extending in a leftward/rightward direction. A cartridge is attachable to the cartridge attachment portion. An occupying range of the cartridge attachment portion is overlapped with an occupying range of the power transmission mechanism and outside of an occupying range of the sheet roll and the holder in the leftward/rightward direction. The holder and the cartridge are attachable to and detachable from the casing through an opening thereof.

A printing apparatus that performs printing by using a print head includes a first power supply, a second power supply, and a control unit. The first power supply supplies a first voltage to the print head through a first supply line. The second power supply supplies a second voltage to the print head through a second supply line. The control unit supplies the first voltage from the first power supply without supplying a voltage from the second power supply at the time of an inspection of the print head, and executes a process action concerning a current leakage when a voltage exceeding a predetermined first threshold is generated on the second supply line.