Sheet conveying device, sheet feed device and image forming apparatus having the same

摘要

A sheet sender 21A includes a lift plate 21P, a feed roller 21B and a registration roller 23. A biasing spring 21S applies an upward force onto the lift plate 21P. The lift plate 21P is moved upward by eccentric cams 60 which are arranged at axial ends of the feed roller 21B and rotationally driven by arm protrusions 211 which have come in contact with the eccentric cams 60. A rotational driving force is transmitted to a feed gear 220 and a registration gear 231 from a main gear 70 to rotate the feed roller 21B and the registration roller 23. A gear of the main gear 70 that engages with the feed gear 220 is idly rotatable within a predetermined angle with respect to a gear that engages with the registration roller 23.