| 摘要 |
PURPOSE:To maintain a required film unwinding force upon using a plate-like pressure member by providing a magnetic pressure plate provided detachably on the film surface. CONSTITUTION:Magnetic pressure plate 2, 2 are pressed against the unwinding surface 1a of a film (a) unwinding belt 1 with a predetermined pressure by an attraction of a magnet member 3. When unwinding belts 1, 1 are operated, a sufficient frictional force due to the pressure force is produced between the unwinding surface 1a and the film (a) so that the film (a) is unwound downward by this frictional force. Further, since the frictional force between the film (a) and the unwinding belt 1 is proportional to the pressure forces of magnetic pressure plates 2, 2, the magnetic force of the magnet member 3 can be adjusted to obtain a predetermined frictional force so that a proper frictional force is obtained by the adjustment of magnetic force of the member 3.
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