| 摘要 |
PROBLEM TO BE SOLVED: To provide a device capable of preventing incorrect drive transmission owing to a planetary gear revolvable around a sun gear.SOLUTION: A device includes a sun gear 97 to be drive-transmitted from a drive source to rotate, an arm 102 which rotates on the same axis as the sun gear 97, a planetary gear 98 which is rotatably supported on the arm 102 and revolves around an outer periphery of the sun gear 97 in a rotational direction of the sun gear 97 while engaging with the sun gear 97, and a second gear 101 which rotates when engaged with the planetary gear 98. A sun gear 97 rotates in a direction shown by an arrow 99 through reverse rotation of a drive source to engage a planetary gear 98 with a second gear 101, and also rotates in a direction shown by an arrow 100 through right rotation of the drive source to separate the planetary gear 98 from the second gear 101. A rotational center 116 of the sun gear 97 is positioned across a rotational center 130 of the planetary gear 98 with respect to a common normal line 119 for a tooth surface of the planetary gear 98 and a tooth surface of the second gear 101 when the second gear 101 rotates in a direction shown by an arrow 134. |
