| 摘要 |
<p>A process for cutting through running web of fabric, esp. paper web, involving toothed knife, here entails swinging knife (7) into web (5) at acutely inclined angle, alpha, where alpha equals 45 deg. max. Also claimed is appts. as above for implementation of process Pref. knife is driven, i.e. swung or rotated, into web against, alternatively with, direction of web travel. angle between web and knife, i.e. alpha governing web speed (16) and knife (15) speed as it is driven in, and speeds are chosen one after other in such way that resulting cut edge (14) is as far as possible straight line. knife is driven, i.e. swung or rotated, into web against, alternatively with, direction of web travel. angle between web and knife, i.e. alpha governing web speed (16) and knife (15) speed as it is driven in, and speeds are chosen one after other in such way that resulting cut edge (14) is as far as possible straight line. relationship between these quantities is: tan alpha = Vknife/Vweb where Vweb is web speed relative to component of knife speed parallel to web and Vknife is speed of knife relative to web. Alpha is between 10 and 40 deg. during cutting. knife extends over only part of web breadth</p> |
