《Research Disclosure》1980年第199期介绍了一种自动独立工作的片卷安全切换装置。这种装置,可用于胶片制造工艺,当片卷张力达到预定值时可以切断运行的片卷。该装置的结构如下图所示:1为箱体,装有三个自由转动的辊轴2、3、4。辊轴 Research Disclosure, No. 199, 1980, presents a roll-to-roll safety switching device that operates automatically and independently. This device, which can be used in the film manufacturing process, can cut off the running roll when the web tension reaches a predetermined value. The structure of the device is shown in the figure below: 1 is a box with three freely rotating rollers 2, 3, 4. Roller shaft