Portable miniaturized printer device

A thermal printer, comprising:

• a thermal printing head;
• a recessed accommodation part that accommodates a roll-shaped continuous paper;
• a pair of rack gears arranged in a staircase-like shape on a paper conveyance direction side of the roll-shaped continuous paper accommodated in the accommodation part and having tooth rows arranged in a first direction orthogonal to the paper conveyance direction so as to face each other, wherein the pair of rack gears are respectively arranged on different stepped planes;
• a pinion gear arranged between the pair of rack gears that fits into the tooth rows of the pair of rack gears;
• and
• a pair of paper guides respectively provided at one end portion of an upper rack gear of the pair of rack gears in the first direction and another end portion of a lower rack gear of the pair of rack gears in the first direction, and support side surfaces of the continuous paper accommodated in the accommodation part, wherein
• the pair of paper guides are configured to open and close in the first direction by the pair of rack gears and the pinion gear.

A portable printer, comprising:

• a recessed accommodation part that accommodates a roll-shaped continuous paper;
• a pair of rack gears arranged in a staircase-like shape on a paper conveyance direction side of the roll-shaped continuous paper accommodated in the accommodation part and having tooth rows arranged in a first direction orthogonal to the paper conveyance direction so as to face each other, wherein the pair of rack gears are respectively arranged on different stepped planes;
• a pinion gear arranged between the pair of rack gears that fits into the tooth rows of the pair of rack gears;
• and
• a pair of paper guides respectively provided at one end portion of an upper rack gear of the pair of rack gears in the first direction and another end portion of a lower rack gear of the pair of rack gears in the first direction, and support side surfaces of the continuous paper accommodated in the accommodation part, wherein
• the pair of paper guides are configured to open and close in the first direction by the pair of rack gears and the pinion gear.