An image forming apparatus having a plurality of functional units includes a power failure detection circuit configured to detect a power failure of an external power supply for the image forming apparatus, a rechargeable battery unit, and a control unit. The control unit switches the power supply source of the image forming apparatus from the external power supply to the rechargeable battery unit, and selects one or more of the functional units to power through the rechargeable battery unit based on a remaining capacity of the rechargeable battery unit, when the power failure of the external power supply is detected.

An image forming apparatus having a plurality of functional units includes a power failure detection circuit configured to detect a power failure of an external power supply for the image forming apparatus, a rechargeable battery unit, and a control unit. The control unit switches the power supply source of the image forming apparatus from the external power supply to the rechargeable battery unit, and selects one or more of the functional units to power through the rechargeable battery unit based on a remaining capacity of the rechargeable battery unit, when the power failure of the external power supply is detected.

A printing apparatus includes an electrical storage that is charged by power input from an external power supply, a print unit that sequentially executes, by discharging the power charged in the electrical storage, a plurality of sequences in an operation sequence for printing on a print medium, and a charge unit that charges the power in the electrical storage from a period beginning when execution of one sequence by the print unit ends, until a next sequence starts. A prediction unit predicts an electrical energy amount necessary to execute the next sequence, and a control unit controls the print unit to execute the next sequence in a case in which an electrical storage amount of the electrical storage becomes greater than a threshold based on the electrical energy necessary to execute the next sequence by charging of the electrical storage by the charge unit.

A printing apparatus includes an electrical storage that is charged by power input from an external power supply, a print unit that sequentially executes, by discharging the power charged in the electrical storage, a plurality of sequences in an operation sequence for printing on a print medium, and a charge unit that charges the power in the electrical storage from a period beginning when execution of one sequence by the print unit ends, until a next sequence starts. A prediction unit predicts an electrical energy amount necessary to execute the next sequence, and a control unit controls the print unit to execute the next sequence in a case in which an electrical storage amount of the electrical storage becomes greater than a threshold based on the electrical energy necessary to execute the next sequence by charging of the electrical storage by the charge unit.

A power supply apparatus includes a power source unit configured to supply electric power to an electric load, a capacitor connected to a power supply line extending from the power supply unit to the electric load, a charge circuit configured to charge the capacitor while restricting a current value of the electric power supplied from the power source unit, a specifying unit configured to specify a voltage value of the capacitor, a first determination unit configured to determine whether the charge of the capacitor is completed in accordance with the voltage specified by the specifying unit, and a second determination unit configured to determine whether the voltage specified by the specifying unit is equal to or smaller than an error threshold value after the first determination unit determines that the charge of the capacitor is completed.

A power supply apparatus includes a power source unit configured to supply electric power to an electric load, a capacitor connected to a power supply line extending from the power supply unit to the electric load, a charge circuit configured to charge the capacitor while restricting a current value of the electric power supplied from the power source unit, a specifying unit configured to specify a voltage value of the capacitor, a first determination unit configured to determine whether the charge of the capacitor is completed in accordance with the voltage specified by the specifying unit, and a second determination unit configured to determine whether the voltage specified by the specifying unit is equal to or smaller than an error threshold value after the first determination unit determines that the charge of the capacitor is completed.

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.

A printer apparatus including a driving device that is energized during printing, a driving circuit for the driving device, a circuit board on which the driving circuit is mounted, and a processor programmed to determine whether or not a power-off instruction of the printer apparatus is given, and control the driving circuit to energize the motor responsive to the power-off instruction. The driving device may be a stepper motor connected to a conveying roller that is rotated during printing, or a print head comprising heating elements that generate heat during printing.

A printer apparatus including a driving device that is energized during printing, a driving circuit for the driving device, a circuit board on which the driving circuit is mounted, and a processor programmed to determine whether or not a power-off instruction of the printer apparatus is given, and control the driving circuit to energize the motor responsive to the power-off instruction. The driving device may be a stepper motor connected to a conveying roller that is rotated during printing, or a print head comprising heating elements that generate heat during printing.