| 摘要 |
A sheet feeder mountable to a body of an apparatus includes a bottom plate on which the sheets are placed and a bottom plate lift unit including a bottom plate pusher disposed beneath the bottom plate, a rack member to rotate the bottom plate pusher vertically by moving horizontally, a pinion gear to move the rack member horizontally, a biasing member to pull the bottom plate pusher toward the rack member, attached therebetween, and a position detector to detect positions of the rack member and the pinion gear. The pinion gear is coupled using projection-and-recess engagement to a rotation transmission device provided to the body, and a quantity of tooth Z1 of the pinion gear by which the rack member is moved by the rotation transmission device, a total tooth number Z2 of the pinion gear, and a coupling division number S of the rotation transmission device satisfy Z1=Z2·(1/S)·N.
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