Patent ID: 8520272

Claim:
A sheet feeder apparatus comprising: a roller feeding sheets of media in a process direction; a transparent platen positioned after said roller in said process direction, said transparent platen being positioned relative to said roller to receive said sheets of media from said roller, said transparent platen having a sheet side and a scanner side, opposite said sheet side; a scanner positioned on said scanner side of said transparent platen; and a calibration strip positioned on said sheet side of said transparent platen, said scanner obtaining images of said calibration strip through said transparent platen during calibration of said scanner, said roller feeding said sheets of media over said sheet side of said transparent platen and said calibration strip, said calibration strip having a curved end surface having outer ends and a center, said center of said curved end surface being between said outer ends of said curved end surface in a cross-process direction, said cross-process direction being perpendicular to said process direction, and said center of said curved end surface extending further in said process direction relative to said outer ends of said curved end surface.