| 摘要 |
PROBLEM TO BE SOLVED: To realize a sheet shutter drive saving a space with a high efficiency and a low cost. SOLUTION: As a drive of a pivot winding up the sheet shutter, a large number of small spur gears or worm wheels are arranged on a large-sized spur wheel or the circumference of a worm wheel to drive them with a large number of low cost small motors, and reduction of a driving cost, enhancement of mechanical reliability and promotion of space-saving efficiency can be realized. COPYRIGHT: (C)2004,JPO
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