A printer includes a printing unit configured to print on the print medium, a ribbon shaft configured to hold the ink ribbon, a partition member provided swingably between a close position where gears that transmit drive force to the ribbon shaft mesh with each other and an open position where meshing between the gears is released, and a lock mechanism configured to hold the partition member with respect to the printing unit when the partition member is placed at the close position.

A printer includes: a housing; a platen holder; a platen roller; a printing head; an operation member; a first link; a second link; a connection member having a connecting portion connecting the first link to the second link; and a movable member moving the platen holder in response to a pivotal movement of the second link to move the platen roller toward and away from the printing head. When the operation member is moved within a first movable range, the second link is pivotally moved while the first link and the connecting portion are maintained at a first positional relationship. When the operation member is moved within a second movable range different from the first movable range, a positional relationship between the first link and the connecting portion is changed from the first positional relationship to a second positional relationship while the second link is maintained stationary.

A printing unit includes a platen lock mechanism for switching between a locked state and an unlock state of the platen roller; and an urging member for urging the lock arm. The head unit has receiving grooves receiving the platen bearings through an opening. A lock arm presses the platen bearings when the operation lever is at the lock position, and is configured to allow disengagement of the platen bearings from the receiving groove through the opening by being swung from the lock position toward the unlock position side. The lock arm includes a pushing-up arm configured to push the platen bearings from the receiving groove toward the opening side along with movement of the operation lever from the lock position toward the unlock position. An urging member urges the lock arm toward the platen unit side.

Provided herein is a printing apparatus including a printhead movable between a first position and a second position. The printhead includes a first substrate and a second substrate. The first substrate and the second substrate define at least a first burn line and a second burn line, respectively, of heating elements disposed adjacent to a first edge and a second edge, respectively of the printhead. A printhead bracket receives the printhead in one of the first position or the second position. In the first position, the heating elements of the first burn line perform a printing operation and the printhead bracket is configured to preclude operation of the heating elements of the second burn line. In the second position, the heating elements of the second burn line perform a printing operation, and the printhead bracket is configured to preclude operation of the heating elements of the first burn line.

A printer includes a printing portion configured to print on a print medium, a ribbon supply shaft configured to hold an ink ribbon to be supplied to the printing portion, and a ribbon roll up shaft configured to roll up the used ink ribbon, wherein the ribbon supply shaft is provided movably between a ribbon supply position where the ink ribbon is supplied to the printing portion, and a ribbon replacement position where the ribbon supply shaft is attachable to and detachable from the printer, and rotated in the direction in which the ink ribbon is rolled up in the middle of moving from the ribbon replacement position to the ribbon supply position.

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.

A printer includes a thermal head that performs printing on a print medium, a head unit to which the thermal head is attached, a holding part movable between a first position for holding the thermal head at an attachment position of the head unit and a second position for canceling the holding of the thermal head to the attachment position, and a receiving part that receives the thermal head when the holding part is at the second position.

A thermal printer is provided which starts up at a practical speed and whose ink ribbon is unlikely to leave trails on a recording medium. The thermal printer includes a first transporting unit transporting an ink ribbon, a second transporting unit transporting a recording medium, at least one motor driving the first transporting unit and the second transporting unit simultaneously, a thermal head thermally transferring ink of the ink ribbon onto the recording medium to print, and a controller accelerating the motor from a rest state to a target speed while the recording medium and the ink ribbon are pressed against the thermal head. The controller accelerates the motor in a first period which is a mechanical delay time required for driving force of the motor in the rest state to be transmitted to the second transporting unit, drives the motor at a constant speed or accelerates the motor at a rate smaller than that of the first period in a second period from when the first period is ended and before the target speed is reached, and accelerates the motor at a rate greater than that of the second period in a third period from when the second period is ended until the target speed is reached.

A printer includes a printing unit configured to print on the print medium, a ribbon shaft configured to hold the ink ribbon, a partition member provided swingably between a close position where gears that transmit drive force to the ribbon shaft mesh with each other and an open position where meshing between the gears is released, and a lock mechanism configured to hold the partition member with respect to the printing unit when the partition member is placed at the close position.

A printer includes a body including a label sheet storage location and a cover rotatably attached to the body and covering the storage location when closed. The cover includes a roller having a shaft that is used for conveying the label sheet when the cover is closed and a peeling bar extending above the roller. The body includes a pressing member extending along the direction and pressing the sheet against the bar for peeling a label from the label sheet and a release lever arranged at an end of the pressing member. The release lever has a recess and rotates between a first position at which the shaft fits into the recess and a second position at which the shaft is released. The release lever rotates from the first to second positions to open the cover when a release button is pressed.