| 摘要 |
PURPOSE:To maintain the entire length of an endless belt applied over a plurality of pulleys approximately constant when moving the belt back and fro, by employing at least one V-pulley having automatically variable diameter. CONSTITUTION:A film peeling roller 4 will rotate in the opposite direction from the rotation of film roll, and upon contact of the leading edge of film with the teeth section 4A of roller 4, the leading edge of film is peeled from the roller and led through an endless belt 3 between drive roller 6 and pinch roller 7. The movement of inverted rollers 4, 5 will be different depending on whether the diameter of film wound around the reel 2 is long or short under the relation between the pause and operational positions of peeling roller 4, thereby the tension will be different in accordance to the length of endless belt 3 applied onto them. With correspondence to the variation of tension, V-pulley 5 having variable diameter will open against a spring thereby the pulley diameter is adjusted to maintain the entire length of endless belt 3 constant. |
