| 摘要 |
PURPOSE:To obtain the device with less wear and long life, by driving and displacing the screen with a plurality of cranks with the same arms and same rotation phases. CONSTITUTION:Crank arms 7-10 have the same length in each crank mechanism, and the crank arms for each crank mechanism are turned in the same phase. The frame supported with the crank pin 3 linking the crank arms 7, 8 and the crank pin 4 linking crank arms 9, 10 is turned while drawing circular turning locus in air, with the crank pins 3, 4 turned with circular turning locus in air in the same phase. Thus, the screen 1 made of frosted glass plate is reciprocated toward Z orthogonal to the screen plane (X-Y plane). |
