According to the present invention, a roll member is formed by winding a heat-sensitive
adhesive sheet in one direction, and the heat-sensitive
adhesive sheet can be smoothly deflected and easily
cut to a predetermined length. A heat-sensitive
adhesive sheet, while being unwound from a roll member stored in a roll member storage unit, is inserted into a printing device and is heated by a
thermal head to perform printing on a printing enabled layer of the sheet. After the printing has been accomplished, the heat-sensitive adhesive sheet is conveyed forward to a guide portion until the
leading edge of the sheet abuts upon a guide roof member. While contacting the guide roof member, the
leading edge of the heat-sensitive adhesive sheet is slid down and guided along the guide roof member to the nip portion of a pair of
insertion rollers and is held at the nip. Once the
insertion rollers 13 have been halted, or have begun rotating slowly, the heat-sensitive adhesive sheet 1 is conveyed further and is deflected downward and assumes a concave shape. Then, the heat-sensitive adhesive sheet 1 is
cut to a predetermined length by a
cutting device, and the heat-sensitive adhesive layer of the
cut portion is heated and thermally activated by a thermal activation device 5.