| 摘要 |
<p>A paper sheeter for cutting two or more webs simultaneously into sheets has a rotary knife 4 to make the cuts in desired register with marks (e.g. watermarks) carried by the web. Sensors MSA, MSB are provided for detecting the marks on each web and a further sensor 9 monitors the knife rotation; signals from the several sensors are fed to a control unit 10 in which the signals from each mark sensor are compared with signals from the knife sensor to produce feed control signals for the respective web. These control signals may be applied to brakes BA, BB associated with the web supply reels 1, 2 to vary the tension in each web; alternatively one web may be controlled by using the control signals to vary the speed ratio between the knife and pull rolls 3 feeding the webs to the knife <IMAGE></p> |
