| 摘要 |
PURPOSE:To prevent an impact by applying the brake by preparing in a winding cylinder an oppression plate that moves according to winding of a projecting screen. CONSTITUTION:A supporting metal fittings 3, a central axis 2 supported with a rotary bearing, an oppression plate 5 that is engaged with a male screw formed around said axis and is guided by a guiding rod 4 and a compression spring 6 are prepared inside a winding cylinder 1 for a spring winding type projecting screen. Therefore, when in order to wind a projecting screen, the winding cylinder 1 is rotated, the supporting metal fittings 3 and the oppression plate 5 rotate in a body, so the oppression plate 5 travels in the right direction in the figure along a screw of the axis 2 and oppresses the compression spring 6, so frictional force increases gradually, an impact when winding of a projecting screen terminates can be prevented. |
