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Manual screens are a popular choice because they are versatile, easy to use, and easy to install. They are also recognizable as the screens used in school classrooms. Manual pull-and-release systems allow you to lower the screen to the desired height and lock it into place. Manual wall and ceiling screens offer presenters a professional solution for virtually any situation. These screens can be rolled into a secure housing after use. Manual screens are considerably more affordable than the electric screens.
A rolling ball stop system was adopted. The projection screen could be accurately stopped and rolled up/ down anywhere. The screen would be slowly rolled back with a pull. And the bottom of screen will just slightly touch the casing. The user does not need to control the roll back of the screens all the time. The rolling ball stop system is human-based. Moreover, it can effectively lengthen the screen's service life and improve the safety. |