A controller is to control a discharger to provide power from an energy storage to an electrical device during a period when the electrical device is to require a power maximum. The controller is to control the charger to provide power from a power supply to the energy storage during a period when the electrical device is to require a power minimum. The electrical device is to be powered by a power supply.

A controller is to control a discharger to provide power from an energy storage to an electrical device during a period when the electrical device is to require a power maximum. The controller is to control the charger to provide power from a power supply to the energy storage during a period when the electrical device is to require a power minimum. The electrical device is to be powered by a power supply.

Of at least three drive sources provided inside a printer body, a carriage-driving motor and a transport motor are disposed on one side with respect to a center portion in a width direction that intersects a medium transport direction while a sheet-feed motor is disposed on the other side with respect to the center portion in the width direction. The battery that provides electric power to the three drive sources is disposed such that the center of gravity of the battery is on the other side with respect to the center portion in the width direction.

Of at least three drive sources provided inside a printer body, a carriage-driving motor and a transport motor are disposed on one side with respect to a center portion in a width direction that intersects a medium transport direction while a sheet-feed motor is disposed on the other side with respect to the center portion in the width direction. The battery that provides electric power to the three drive sources is disposed such that the center of gravity of the battery is on the other side with respect to the center portion in the width direction.

In an inkjet printer, from one side of a main scanning direction, first through fourth ultraviolet irradiation devices arrayed in the main scanning direction at least partially overlap first and second recording heads. A distance in the main scanning direction between a middle position in the main scanning direction of the first recording head and a middle position in the main scanning direction of the first ultraviolet irradiation device is equal to a distance in the main scanning direction between the middle position of the first recording head and a middle position in the main scanning direction of the second ultraviolet irradiation device. A distance in the main scanning direction between a middle position in the main scanning direction of the second recording head and a middle position in the main scanning direction of the third ultraviolet irradiation device is equal to a distance in the main scanning direction between the middle position of the second recording head and a middle position in the main scanning direction of the fourth ultraviolet irradiation device.

A method in a printer comprising a first printhead to dispense a first printing fluid and a second printhead to dispense a second printing fluid, the first and second printheads being arranged on a common scan axis that is substantially perpendicular to a media advance direction. The method comprises controlling movement of the first and second printheads relative to a media being printed, between a first index position and a second index position, the second index position being downstream of the first index position, and wherein the movement occurs during a time period between a forward scan and a reverse scan of the first and second printheads across a media being printed.

A wide-range positive-negative adjustable high-voltage DC power supply includes the following components: a high-voltage generator, a negative high-voltage terminal, and a positive high-voltage terminal; a first driving circuit, a first voltage regulating unit, a current detection and amplification circuit, a second driving circuit and a second voltage regulating unit that are connected in turn; and an adjustable high-voltage output terminal; as well as an instruction input terminal, an instruction voltage circuit and an error amplifier that are connected in turn, and a voltage feedback circuit.

A printing apparatus includes a carriage unit, and carries out printing on a recording medium while transporting the recording medium. The carriage unit includes a first head that discharges an ink and a second head that discharges an ink of the same color, and the second head is disposed so as to be adjacent to the first head in an x axis direction, and to overlap with the first head in a y axis direction. In an outgoing path in the reciprocation of the carriage unit, a printing density of a first image, which the first head prints, gradually decreases toward an upstream side in a transport direction of the recording medium, and the first image includes a dot group, in which at least two dots formed using the ink from the first nozzles are linked to one another in the x axis direction. In addition, in a return path in the reciprocation of the carriage unit, the second nozzles print a second image, which supplements a decrease in the printing density of the first image.

A liquid ejecting apparatus for ejecting materials on a recording medium in accordance with a position of the apparatus and an image to be formed. The apparatus, movable on the recording medium by an external force, includes a position calculating unit configured to calculate the position; an electric power supplying unit configured to supply electric power to a part that the position calculating unit uses to calculate the position when a state of the apparatus changes to a second operating mode whose electric power consumption is less than that of a first operating mode of ejecting the materials; and a return factor detecting unit configured to detect a return factor for returning to the first operating mode from the second operating mode. When returning to the first operating mode, the apparatus restarts to eject the materials from the position that has been calculated in the second operating mode.

A liquid ejecting apparatus for ejecting materials on a recording medium in accordance with a position of the apparatus and an image to be formed. The apparatus, movable on the recording medium by an external force, includes a position calculating unit configured to calculate the position; an electric power supplying unit configured to supply electric power to a part that the position calculating unit uses to calculate the position when a state of the apparatus changes to a second operating mode whose electric power consumption is less than that of a first operating mode of ejecting the materials; and a return factor detecting unit configured to detect a return factor for returning to the first operating mode from the second operating mode. When returning to the first operating mode, the apparatus restarts to eject the materials from the position that has been calculated in the second operating mode.