Patent ID: 7515865

Claim:
A recording medium feeding device comprising: a delivery roller provided so as to abut on a surface of recording medium and for delivering the recording medium to a downstream side in a direction of conveyance of the recording medium in accordance with the rotation of the delivery roller; a separation member provided on the downstream side with respect of the delivery roller; a feed roller provided opposite to the separation member to sandwich the recording medium delivered by the delivery roller with the separation member, the feed roller rotating for separating and conveying the recording medium one by one; and a pair of registration rollers provided on the downstream side with respect to the feed roller, the registration rollers rotating for conveying the recording medium, wherein a diameter of the feed roller is larger than a diameter of the delivery roller, wherein the recording medium delivered by the delivery roller is conveyed so as to be turned back like a U figure along a circumferential surface of the feed roller, a conveyance path for conveying the recording medium after turning back like the U figure is inclined toward a side where a recording medium storage portion is provided, wherein both the delivery roller and the feed roller are provided as a non-circular roller having a large diameter portion, and a small diameter portion that has a diameter smaller than that of the large diameter portion in terms of a sectional shape perpendicular to a rotation axis of the non-circular roller, and wherein the diameter of the feed roller is equal to an integral multiple of the diameter of the delivery roller.