Patent ID: 8422036

Claim:
An edge sensing apparatus for a substrate media handling assembly, the handling assembly conveying sheets of substrate media in a process direction along a path, a cross-process direction extending substantially laterally to the process direction, the edge sensing apparatus comprising: a first emitter and a second emitter, beams radiated from the first emitter being emitted in at least partially an opposite direction from beams radiated from the second emitter; a first detector and a second detector, the first and second detectors being aligned to receive beams from the first and second emitters respectively, where the first detector is offset from the first emitter in a substantially lateral direction to the process direction, and the second detector is offset from the second emitter in a substantially lateral direction to the process direction, and the first detector and the first emitter are disposed on respective vertically opposite sides of the path, and the second detector and the second emitter are disposed on respective vertically opposite sides of the path; and a timer receiving signals from both the first and second detectors, wherein a change of the signals determines a position of an edge of a substrate media sheet causing the change of signals.