| 摘要 |
PROBLEM TO BE SOLVED: To ensure a certain engagement state without generating a disengagement at the time of initial engagement of re-engagement after a door driving gear for driving a door is once disengaged from a driving gear. SOLUTION: The door driving device is constituted by a driving gear 27 normal-rotatably or reverse-rotatably driven by a driving means 35 and having at least first and second geared areas 37, 41 and first and second non-gear areas 39, 43; and first and second door driving gears 29, 31 having cam parts 49, 53 operated with any one of the non-gear areas 39, 43 and engagement gear parts 49, 51 engageable with a gear at the other geared area when the cam parts 49, 53 are operated on one none-gear areas 39, 43. Initial gears 47a, 51a of the respective engagement gear parts 47, 51 re-engaged after they are disengaged from the geared areas 37, 41 of the drying gear 27 are made to a shape of large tooth depth to ensure a certain engagement at the time of initial engagement.
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