| 摘要 |
<p>The device has a curtain (1) including belts (2, 3) provided at its lateral edge (4), where each belt comprises saw tooth shaped teeth (5, 6) along a longitudinal direction. The belts are arranged such that the belts are engaged with one another during unrolling of the curtain. The belts have hollows (8, 9) at which projecting parts (10, 11) of the teeth are engaged respectively for connecting the belts and permitting one belt to press on another belt in length direction of the belts. A drive pulley has an axle extending parallel to an axle of another drive pulley.</p> |
