| 摘要 |
PURPOSE: A blind is provided to efficiently ascend and descend a blind sheet using two rotary rollers and to reduce the friction between blind sheets. CONSTITUTION: A blind sheet is connected to two rotary rolls using a connecting member. Two rotation rolls is connected in order to have the stated angle toward a blind falling direction. A first rotation roll of two rotation rolls is rotated in one direction. When a second rotation roll is connected to the first rotation roll, rotates in an opposite direction. |
