A printing apparatus includes: a main-body having a space therein; a thermal head arranged on a substrate provided in the space, the thermal head having heating elements arranged along a predetermined arrangement direction; a conveyor which conveys a thermal paper along a conveyance path provided in the space and intersecting with the arrangement direction; a first temperature sensor provided in a first space in the space on a side of the thermal head with respect to the conveyance path; a second temperature sensor provided in a second space in the space on a side opposite to the thermal head with respect to the conveyance path; and a processor configured to: correct an amount of applying energy to be applied to the heating elements, based on first and second temperatures detected by the first and second temperature sensors; and apply corrected amount of the applying energy selectively to the heating elements.

A printer includes a processor; a thermal head driver circuit that drives a thermal head for printing on a printing medium; a motor driver circuit that drives a motor configured to convey the printing medium; and a power supply circuit that includes a capacitor and a first switching circuit to charge the capacitor, the power supply circuit supplying electrical power to the thermal head driver circuit and the motor driver circuit via the capacitor, wherein the processor, when stopping operation of the printer, performs a control process of discharging the capacitor via the motor driver circuit and the motor.

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 battery-powered printer includes a printing head that has a plurality of heat generating elements arranged along a direction orthogonal to a transport direction of a recording medium and is configured to print on the recording medium, a temperature sensor configured to measure a temperature within the printer, and a processor configured to determine whether the temperature measured by the temperature sensor is equal to or lower than a predetermined threshold, determine a constant printing speed at the time of printing under a condition where the temperature is equal to or lower than the predetermined threshold, and control the printing head and a transporting speed of the recording medium so as to cause each line of the print data to be printed on the recording medium at the constant printing speed.

A method for managing printing of data by a thermal printer. The thermal printer includes a thermal print head. The thermal print head has a plurality of points, each point having an effective resistance r.sub.d, and is powered by a power source. The method includes the following actions: measuring a voltage U given by the power source of the thermal printer; measuring an internal resistance r.sub.u of the power source; and computing a duration t for heating a number n of points as a function of the voltage U of the power source, the internal resistance r.sub.u of the power source, at least one effective resistance r.sub.d of at least one point corresponding to a dot to be printed for the printing of the data and as a function of at least one value of parasitic resistance r.sub.p of at least one element of the thermal printer.

A printing apparatus includes: a main-body having a space therein; a thermal head arranged on a substrate provided in the space, the thermal head having heating elements arranged along a predetermined arrangement direction; a conveyor which conveys a thermal paper along a conveyance path provided in the space and intersecting with the arrangement direction; a first temperature sensor provided in a first space in the space on a side of the thermal head with respect to the conveyance path; a second temperature sensor provided in a second space in the space on a side opposite to the thermal head with respect to the conveyance path; and a processor configured to: correct an amount of applying energy to be applied to the heating elements, based on first and second temperatures detected by the first and second temperature sensors; and apply corrected amount of the applying energy selectively to the heating elements.

A printer includes a processor; a thermal head driver circuit that drives a thermal head for printing on a printing medium; a motor driver circuit that drives a motor configured to convey the printing medium; and a power supply circuit that includes a capacitor and a first switching circuit to charge the capacitor, the power supply circuit supplying electrical power to the thermal head driver circuit and the motor driver circuit via the capacitor, wherein the processor, when stopping operation of the printer, performs a control process of discharging the capacitor via the motor driver circuit and the motor.

A printing apparatus operates by receiving power from a USB PD adapter outputting a DC voltage. The printing apparatus includes a first printing section configured to perform printing on a medium, a second printing section configured to perform printing on the medium, and a negotiation information obtainer configured to obtain negotiation information between the printing apparatus and the USB PD adapter. The negotiation information includes a rated power value. When the rated power value is less than the first predetermined value, the second printing section is configured to not perform printing on the medium during a time period in which the first printing section performs printing on the medium, and the first printing section is configured to not perform printing on the medium during a time period in which the second printing section performs printing on the medium.

A printing apparatus includes a thermal head and a processor. The thermal head prints an image on lines in a medium. The thermal head includes heat-generating elements to generate heat when a voltage is applied thereto in an application time, and the thermal head is controlled to sequentially on print each line. The processor is configured to: determine a specific line among lines based on printing data for printing lines, the specific line being a line estimated to have a possibility of sticking; and adjust the application time of an adjustment target line so as to be shorter than a reference application time, the adjustment target line having at least one line among lines, the at least one line being a line which is to be printed immediately before the specific line, the reference application time being set based on a temperature of the thermal head.

A printing apparatus includes a thermal head and a processor. The thermal head includes heat-generating elements and prints on a plurality of lines in a medium. The processor sets a second period within one of the setting periods. The second period is a time period for adjusting a temperature change of the heat-generating elements without printing on the medium, after a first period for printing. The processor determines a n.sup.th line (n: an integer of 2 or greater) among the lines based on printing data. The n.sup.th line is estimated to have a possibility of sticking in printing. The processor adjusts a temperature change of at least a part of the heat-generating elements in the second periods corresponding to at least the n.sup.th line and a (n1).sup.th line. The (n1).sup.th line is printed immediately before the n.sup.th line based on the printing data, to suppress the sticking.