Patent ID: 7429038

Claim:
A finisher for an image forming apparatus, the image forming apparatus defining a path along which a medium, on which an image is formed, travels, the medium including a leading edge and a trailing edge, the finisher comprising: a pair of rotatable downstream rollers; a pair of rotatable upstream rollers defining a nip having an upstream nip line, the upstream rollers being upstream of the downstream rollers relative to the path; a determining device to determine when the trailing edge of the medium is about to leave the nip of the upstream rollers; a stopping device that stops the leading edge of the medium when the determining device determines that the trailing edge of the medium is about to leave the nip of the upstream rollers, such that the trailing edge registers against the upstream nip line before the trailing edge of the medium leaves the nip of the upstream rollers; and a finishing device that performs a finishing operation to the medium when the trailing edge registers against the upstream nip line.