| 摘要 |
<p>The present method and apparatus relates to automatic deheading of a material web roll (1) containing a long material web, for example, paper for a daily newspaper printing machine. By means of a device (11) the method and apparatus according to the invention comprise the forming of an engagement lip (13) in the protecting layer of a roll envelope surface constituting the wrapper, whereafter said engagement lip is raised for insertion of a knife cutting the envelope surface wrapper, and additionally a guiding of said knife (20) such that this will not at any occasion come in touch with any of the gable sides. Additionally the knife (20) is moved around the envelope surface adjacent to the gable side but on top of the envelope surface itself during rotation of the material web roll (1) by means of rotatable rollers (10) until the knife has cut along all of the protecting wrapper, the wrapper heads adjacent to the knife will be released without any risk that the material web and its edges being damaged.</p> |
