| 摘要 |
PROBLEM TO BE SOLVED: To facilitate adjustment of engagement status, that is, adjustment of backlash, in case where two gears mounted on two roller shafts as drive objects are directly engaged with a pinion gear fitted to a driving motor. SOLUTION: A power transmission device 50 comprises a transportation drive roller gear 51 as drive object, an eject drive roller gear 52 and a pinion gear 53 attached on a rotating shaft 33a of a drive motor 53. The pinion gear 53 displaces as a base 33b of the rotating shaft 33a of the drive motor 33 slides within a slot 59. The inner peripheral surfaces 59a, 59b of the slot 59 is formed by arcs having the center identical with the revolving center B of the eject drive roller gear 52, thereby the backlash between the pinion gear 53 and the eject drive roller gear 52 is kept constant consistently even when the pinion gear 53 displaces and the backlash between the pinion gear 53 and the transportation drive roller gear 51 can be adjusted with ease.
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