| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive unit which can prevent damage of a gear, and can maintain a synchronous rotation even when rotating force of a speed different from a rotation drive speed, etc., is applied for a rear stage gear by a forward stage gear. SOLUTION: Rotation transmission cogs 372d, 382d having a pressure contact of 45°or greater are formed in a seventh transmission gear 37 and an eighth transmission gear 38 which are engaged with a gear transmission mechanism of the drive unit. When the eighth transmission gear 38 precedes the seventh transmission gear 37 in rotation, the braking force is generated. Since first synchronous cogs 372c, 382c, and second synchronous cogs 372e, 382e are formed in the seventh transmission gear 37 and the eighth transmission gear 38, a synchronization of the seventh transmission gear 37 and the eighth transmission gear 38 is usually maintained. COPYRIGHT: (C)2008,JPO&INPIT
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