| 摘要 |
<p>A perforator for perforating a web. The perforator has a rotatable drum (11) for supporting the web (1); an arm (52) having a punch (55), which rotates integrally with the drum (11); a driver for swinging the arm (52), which rotates integrally with the drum; and a taper rib (22) which does not rotate with the drum (11), in which the taper rib is provided with a roller gear cam (21) for engaging with the taper rib (22) which is provided on a circumference concentric with the drum in a cross section perpendicular to an axis of the drum (11), so that the taper rib (22) causes the driver to swing and the punch (55) perforates the web (1) with rotation of the drum. <IMAGE></p> |
