| 摘要 |
<p>A film clamp is disclosed which comprises a platen (3) having an aperture (5) in a flat working surface (9) of the platen (3). A proximal gripping member (11) is positioned to grip one edge of a film (1) supported on the platen (3), and a distal gripping member (13) is positioned to grip an opposite edge of the film (1). A bell crank (23) is adapted to press the proximal gripping member (11) into contact with a film (1) on the platen (3) and to press the distal gripping member (13) into contact with the film (1) and away from the proximal gripping member (11) to place the clamped film (1) in tension across the aperture (5). In order to provide a means for advancing the film (1) relative to the aperture (5) in the platen (3), a motor-driven endless belt (14) is mounted on the platen (3) adjacent the proximal gripping member (11), and the proximal gripping member (11) bears against the belt (14) to grip the film (1).</p> |
