| 摘要 |
For the discharge and the substitution of paper reels in devices for the unwinding of paper reels operating by contact with friction between the outer surface of the reel (34) and the upper reaches of endless friction belts (12a, b, c, d) a wedge-like member (36) is provided adapted to push the reel (34) to be discharged towards the upstream end of the unwinding device, the wedge-like member (36) being more and more wedged in between the belts (12a, b, c, d) and the reels (34) by operating the belts (12a, b, c, d) in a translation direction (F1) opposite to that of normal unwinding (F) of the paper band (C) from the reel (34). Moreover, sensing means (128, 130, 136) in form of a reflecting photocell are mounted at the downstream end of the unwinding device: the light ray (132) emitted from said photocell is intercepted from said reel (34) up to a predetermined height or diameter of the reel (34), whereby, when for a predetermined time the reflected ray (134) is lacking, a signal is generated from the photocell by which the translation motion of said belts is stopped. |
