Patent ID: 8508564

Claim:
A thermal print head device comprising: a thermal print head placed to face a platen roller; a head holding member configured to hold the thermal print bead, the head holding member extending in a tangential direction of the platen roller and being supported to be swingable about a portion away from the platen roller; a biasing member configured to bias the thermal print head or the head holding member, the biasing member having one end placed on a side of the thermal print head or the head holding member to press the thermal print head against the platen roller; and a point-of-action switching member disposed between the biasing member and the thermal print head or the head holding member biased by the biasing member, the point-of-action switching member moving in the tangential direction of the platen roller a point of action at which the one end of the biasing member comes into contact with the thermal print head or the head holding member.