| 摘要 |
<p>PURPOSE:To accurately determine the final location of a film by disposing auxiliary rollers respectively before and behind first and second tension rollers such that respective tension rollers are held to be moved straight making the film portions before and behind respective tension rollers parallel to each other. CONSTITUTION:When first and second tension rollers 2, 5 are suspended only a film 12, they move straight simply in the direction of gravity only by their own weight. Under such a condition, the film portions before and behind respective tension rollers 2, 5 are always parallel to each other so that tension applied to the film 12 becomes constant. Thus, auxiliary rollers 3, 6 are provided such that the film portions 12 before and behind the tension rollers 2, 5 are always held parallel to each other. As a result, the tension is not varied according to the vertical position of both tension rollers 2, 5. Also, the tension is not affected by a change in the film amount on a supply reel 1 and take-up reel 4.</p> |
