| 摘要 |
PROBLEM TO BE SOLVED: To carry out stable positioning with a simple structure. SOLUTION: Rotating force is further applied to a helical gear 11 which is limited in rotation to be moved in an axial direction, and an engaging part 14 provided in the helical gear 11 is engaged to an engaged part 16 of a fixed member 15, whereby positioning of the helical gear 11 to the fixed member 15 is carried out. Stable positioning can be carried out with a simple structure by utilizing thrust of the helical gear 11.
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