| 摘要 |
PURPOSE:To prevent dust in a case from being exhausted externally by providing a magnet near the through hole of the case for projecting externally one end of a driving shaft. CONSTITUTION:A driving device 12 has a case 20 formed in a box shape, and a motor 21 contained in the case 20. A driving shaft 14 is led via a through hole 22 externally, and a permanent magnet 30 is disposed near the hole 22. Dust such as metal wearing chips generated in the case 20 due to the rotation of the motor 21 or the engagement of a pinion gear 24 with a large gear 26 is attracted by the magnet 30 so as not to be leaked externally.
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