| 摘要 |
PROBLEM TO BE SOLVED: To reduce motor noise with ease by restraining the running out of an input shaft 21 and a rotary shaft 19. SOLUTION: If a bearing for the rotary shaft 19 is eliminated by connecting the rotary shaft 19 of a drive motor 23 to the input shaft 21, a large load acts on the input shaft 21. However, since the input shaft 21 is rotatingly supported by an angular ball bearing 50 wherein there is little radial clearance, and the positional dimension of the point on which a bearing load acts becomes long by arranging the bearing 50 with the outer ring 50a mated at its back face, to enhance the rigidity of the bearing, and to restrain shaft running effectively.
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