bookbinding apparatus adhesive applicator accurately , briefly controls adhesive temperature to a set value by selecting , in accordance with adhesive initial temperature , one of a plurality of temperature - controller heating modes defining different supply powers and supply durations for supplying power to an adhesive - container heater to control its heating temperature . a sensor detects the temperature of the adhesive in the container at applicator start - up , or on restarting a post - standby applicator . in accordance with the detected temperature , one of the heating modes is selected to heat the adhesive . the applicator warm - up time is thus set in response to the state of the adhesive : if solidified , the adhesive is heated and melted in a maximum supply - power , supply - duration mode ; if low - temperature liquefied at , it is heated and melted in a second - magnitude supply - power , supply - duration mode ; and if the adhesive temperature is high , it is heated and melted in a minimal supply - power , supply - duration mode .