Abstract: A printing unit includes: a platen roller configured to convey a recording sheet; a thermal head configured to perform printing on the recording sheet through press contact with an outer peripheral surface of the platen roller; a motor configured to serve as a drive source of the platen roller; and a frame configured to support the platen roller in a rotatable manner, wherein the frame includes: a motor support portion configured to support the motor; a base portion which is connected to the motor support portion, and extends in an axial direction of the platen roller; mounting portions which are attached to a member on which the printing unit is to be mounted; a protruding portion which protrudes from the base portion; and a rib which is provided between the motor support portion and the mounting portions, and extends so as to connect the protruding portion and the base portion to each other, wherein the base portion includes a guide surface configured to guide the recording sheet toward the thermal head, an

Abstract: A printing unit includes: a platen roller, which extends in an axial direction, and is configured to convey a recording sheet; a thermal head configured to perform printing on the recording sheet through press contact with an outer peripheral surface of the platen roller; a support plate, which is arranged on a side opposite to the platen roller across the thermal head, and is configured to support the thermal head; a frame, which includes a rear plate portion arranged on a side opposite to the platen roller across the support plate, and is configured to support both ends of the support plate in the axial direction; at least one urging member, which is arranged between the rear plate portion and the support plate, and is configured to press the support plate to the platen roller side; and a protruding portion, which is formed on the support plate to protrude from the support plate to the rear plate portion side, and is configured to regulate displacement of a predetermined urging member of the at least one ur

Abstract: A thermal printer includes a thermal head configured to perform printing on recording paper; a platen roller, which is arranged at a position opposed to the thermal head, and is configured to convey the recording paper by nipping the recording paper between the thermal head and the platen roller; a head support plate having conductivity, which has the thermal head to be fixed thereto; a frame, which is configured to support the head support plate, and includes a shaft support portion configured to rotatably support the platen roller about an axis; and a conductive member having conductivity, which is provided between a side surface of the shaft support portion and the head support plate.

Abstract: A thermal printer includes a thermal head configured to perform printing on recording paper; a platen roller, which is arranged at a position opposed to the thermal head, and is configured to convey the recording paper by nipping the recording paper between the thermal head and the platen roller; a head support plate having conductivity, which has the thermal head to be fixed thereto; a frame, which is configured to support the head support plate, and includes a shaft support portion configured to rotatably support the platen roller about an axis; and a conductive member having conductivity, which is provided between a side surface of the shaft support portion and the head support plate.

Abstract: A printer unit including: a platen roller including a driven gear; a drive source configured to rotate the platen roller about a predetermined axis; a frame, which is configured to rotatably support the platen roller and to which the drive source is assembled; a reduction gear configured to transmit a driving force of the drive source to the driven gear in a decelerated manner; a thermal head to be held in press contact with an outer peripheral surface of the platen roller; a gearbox portion, which is formed on the frame and to which the driven gear and the reduction gear are assembled, the gearbox portion having an opening for assembling the reduction gear; and a gear cover configured to close at least a part of the opening of the gearbox portion, the gearbox portion having a recessed portion recessed in a direction intersecting an axial direction of the predetermined axis, the gear cover including: a hook portion to be engaged with the gearbox portion; and a projecting portion to be fitted to the recessed p

Abstract: A printing apparatus includes a printing unit for performing printing by pressing a thermal head onto heat sensitive paper to heat the heat sensitive paper. A battery supplies a voltage to the thermal head, and a battery voltage detecting unit detects the voltage. A printing control unit changes, according to the detected voltage, a power-off time in which power supply from the battery to the thermal head is stopped. The printing control unit calculates the power-off time based on the detected voltage and the resistance of the thermal head and shortens the power-off time as the detected voltage becomes lower thereby shortening the overall printing time without shortening the life of the heating resistance elements of the thermal head.