| 摘要 |
Continuously supplied sheet material, e.g. synthetic-resin foils is wrapped around the upper of two vertically spaced cores as these cores are rotated about their axes. The two cores are then swung through 180 DEG to move the upper core to the position of the lower core and vice versa, thereby stretching the sheet over a deflecting roller extending between a pair of mounting assemblies or stars (spiders) carrying these cores. The core then in the lower position is rotated until the outer surface of the roll formed thereon is immediately adjacent the upper core, whereupon the sheet is cut and the cut end is wound on the upper core. The lower filled core is replaced with an empty core and the mounting assemblies are again swung through 180 DEG .
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