| 摘要 |
A defect on a moving web (d) such as a printed sheet of paper is detected visually or automatically, and the type of the defect thus detected is marked by means of a stamping unit (22) on a label (b) of a label tape (c) consisting of a base strip (a) and a number of labels (b) removably secured to the base strip (a). Thereafter, the base strip (a) of the label tape is advanced and reversed abruptly in its moving direction, whereby the label (b) is partially separated from the base strip (a). The label thus partially separated is then pressed against the moving web (d) by means of a pressure roller (26). At the instant of pressing of the label against the web, abrupt variation in tension of the label tape occurs, which variation or shock is absorbed by movement of a swing roller (13) on a swing arm (19) in the direction of movement of the web. The label tape (c) is passed around the swing roller (13) and then directed downwardly. The swing arm (19) is linked to the pressure roller (26) through a lever (43) which prevents movement of the roller (13) except during operation of the pressure roller (26). The absorption of the shock prevents any adverse effects such as tearing and wrinkling of the label being affixed. |
