Patent ID: 7871075

Claim:
An image forming apparatus, comprising: a body; a sheet conveyance path; a sub-unit configured to be released from the body; a first pair of rollers configured to rotate in a first direction to convey a sheet in a downstream direction of the sheet conveyance path by holding the sheet, the first pair of rollers configured to rotate in a second direction opposite to the first direction, by a limited, predetermined rotation amount; a second pair of rollers disposed upstream of the first pair of rollers in the sheet conveyance path, the second pair of rollers configured to convey the sheet and configured to hold the sheet; and a third pair of rollers disposed downstream of the first pair of rollers in the sheet conveyance path, the third pair of rollers configured to rotate in a first direction to convey the sheet in a sheet conveyance direction through the sheet conveyance path by holding the sheet, wherein, when the sheet is jammed in the first pair of rollers, the first pair of rollers is restricted from being rotated toward the upstream direction and the second pair of rollers does not rotate even when the sheet stretches toward the downstream direction, wherein the first pair of rollers rotates in the second direction by the limited, predetermined rotation amount when the second pair of rollers is upstream relative to the first pair of rollers while the sheet is held in the first pair of rollers and is disposed between the first pair of rollers and the second pair of rollers, wherein when the second pair of rollers is displaced in the upstream direction, the third pair of rollers is separated, and wherein the first pair of rollers is a registration roller pair, the third pair of rollers is a transfer roller pair, and a distance in which the sheet is reversely conveyed when the first pair of rollers rotates in the second direction by the predetermined rotation amount is set to be smaller than a distance between the registration roller pair and the transfer roller pair.