| 摘要 |
PURPOSE:To select and exchange quickly an optional picture pattern, and to store a back screen when it is not used, by winding both ends of a back screen having two or more picture patterns in the winding direction, to two pieces of rotary shafts which have been placed in parallel. CONSTITUTION:Rotary shafts 2, 3 and motors 4, 5 are supported by supporting frames 6, 7 which have been fixed to a ceiling and a wall, etc., and the shafts 2, 3 are rotated by driving the motors 4, 5, by which a back screen 1 having plural picture patterns in the winding direction is wound, and an optional picture pattern is exchanged quickly. Also, when it is not used, the screen 1 can be stored by winding it all.
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