Optical density tracking sensor for aligning media

Details Optical density tracking sensor for aligning media Optical density tracking sensor for aligning media

1992-03-09

1993-06-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356434, G01N 2186

Patent

active

052162583

ABSTRACT:
In a media transporter which positions media, a method and apparatus is provided for positioning the media for accurate alignment. The method includes the steps of sensing a spatial pattern of densities in the media along a scanned strip, saving the spatial pattern of densities during the initial pass to create a path map from the start position to an end point, comparing subsequently sensed spatial patterns of densities to the path map, and following the path map to repeatedly and accurately position the media at any point along the scanned path. The spatial pattern of densities in the media is sensed by shining a light through the media and sensing the transmitted light intensity.

REFERENCES:
patent: 4723072 (1988-02-01), Naruse
patent: 5013156 (1991-03-01), Murphy

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