Patent ID: 8348270

Claim:
An image forming apparatus comprising: an image forming apparatus main body having an image forming unit configured to form an image on a sheet; a sheet conveyance apparatus provided to be detachable with respect to the image forming apparatus main body and configured to convey the sheet to the image forming unit, wherein the sheet conveyance apparatus includes: a sheet conveyance path through which the sheet passes, and a detection unit including a light emitting unit and a light receiving unit, opposed to the light emitting unit across the sheet conveyance path positioned therebetween, wherein the detection unit is configured to detect a position of a reference portion provided in relation to the image forming apparatus main body and to detect an edge position of the conveyed sheet in a width direction of the sheet orthogonal to a sheet conveyance direction, and wherein the light receiving unit is composed of a plurality of light receiving elements configured to receive light from the light emitting unit and arranged in the width direction on a same substrate; and a control unit configured to determine a position of the sheet based on detections of the position of the reference portion and the edge position of the conveyed sheet by the detection unit.