Platen roller fixing structure and printer

A printer, comprising:

• a body part;
• a movable part rotatably connected to the body part;
• and
• a platen roller fixing structure,
• the platen roller fixing structure including
• a platen roller;
• a spring;
• a spring supporting part supporting the spring;
• a print head;
• a platen roller receiving part configured to receive the platen roller;
• and
• a spring receiving part configured to receive the spring,
• wherein the platen roller, the spring, and the spring supporting part are provided on one of the body part and the movable part,
• the print head, the platen roller receiving part, and the spring receiving part are provided on another one of the body part and the movable part, and
• when the movable part is closed relative to the body part, the spring receiving part comes into contact with the spring to cause the spring to press the platen roller against the platen roller receiving part.