Patent ID: 8798510
Filing Date: 2014-08-05
Classification: G03G

Abstract:
1. A computer-implemented method for calibrating the timing for a mark-on-belt (MOB) sensor, comprising: marking a photoreceptor belt with cyan portions of at least a first and second calibration chevron ensembles; using nominal timing, reading the first and second calibration chevron ensembles during a predefined sensor read window; analyzing a first signal from an outboard MOB leg of an outboard MOB that measures and outboard side of the first calibration chevron ensemble, and analyzing a second signal from an outboard MOB leg of an inboard MOB that measures an outboard side of the second calibration chevron ensemble; and for each chevron ensemble read, determining whether there are N cyan portions, where N is an integer, seen during the read window; wherein N cyan portions are detected in each read window, and further comprising: computing an average for the time from a start of the read window to the first detected cyan portion for each of M captures, where M is an integer; calculating a difference between the computed average and an expected distance value for the nominal start of the read window to the first chevron ensemble; and adjusting a MOB read window offset value as a function of the calculated difference thereby centering the read window on the chevron ensembles.