Patent ID: 7477276

Claim:
A thermal activation device comprising: heating means including a heating element for thermally activating a heat-sensitive adhesive layer of a sheet material having a print layer on one surface of a sheet-like base material and the heat-sensitive adhesive layer on the other surface thereof; a platen roller with which the heating means is brought into press-contact for holding and conveying the sheet material; a support member for supporting the heating means; a support shaft for supporting the support member in a rotatable manner in a direction allowing the heating means to move toward and away from the platen roller; a first urging member for urging the support member in a direction causing the heating means to press-contact the platen roller; a shaft hole in which the support shaft is movably engaged in an urging direction by the first urging member; and a second urging member for regulating a position of the support shaft in the shaft hole and urging the support member in a direction causing the heating means to press-contact the platen roller, wherein an urging force of the second urging member is set to be smaller than the urging force of the first urging member.