Apparatus for binding sheet media

An apparatus for binding media sheets having a region of imaging material applied thereto for binding, comprising:

• a tray for collecting a plurality of media sheets;
• a heating element adjacent to the tray and aligned with a binding region of sheets in the tray;
• a first biasing spring interposed between the heating element and the tray such that the first spring biases the heating element away from the tray;
• a thermally conductive mass adjacent to the heating element opposite the tray, a thermal mass of the thermally conductive mass being substantially greater than a thermal mass of the heating element;
• a second biasing spring interposed between the heating element and the thermally conductive mass such that the second spring biases the thermally conductive mass away from the heating element;
• a press coupled to the heating element and the thermally conductive mass, the press operative for each sheet output to the tray to press the thermally conductive mass toward the heating element;
• and
• the second biasing spring being stiffer than the first biasing spring such that, as the press presses the thermally conductive mass toward the heating element,
• the press first overcomes a resistance of the first biasing spring to press the heating element toward the tray against the binding region of any sheets in the tray, and
• the press then overcomes a resistance of the second biasing spring to bring the thermally conductive mass into contact with the heating element.