Printer

A printer comprising:

• a casing;
• a platen roller;
• a motor that drives said platen roller to rotate;
• said platen roller is configured and operable to convey a printing medium when said platen roller is driven to rotate by said motor;
• a printing head opposing said platen roller, said printing head prints on the printing medium when the printing medium is sandwiched between said printing head and said platen roller;
• a first head support member configured and operable to rotate relative to said casing;
• a first shaft serving as a rotary axis of said first head support member;
• a second shaft attached to said first head support member and said second shaft is rotatable and movable parallel to an axial direction of said second shaft, said second shaft includes a large diameter portion having a comparatively large radius and a small diameter portion having a smaller radius than said large diameter portion and having a different central axis to said rotary axis;
• and
• a second head support member, to which said printing head is attached, said second head support member includes a first set of grooves into which said first shaft is inserted and a second set of grooves into which said second shaft is inserted and said second head support member is configured to move in accordance with rotation of said second shaft, when said second shaft is attached to said first head support member, due to engagement between said first set of grooves and said first shaft and engagement between said second set of grooves and said small diameter portion of said second shaft;
• and
• said second head support member is configured to be removed from said first head support member by moving said second shaft parallel to said axial direction.