Media position sensing system having a plurality of apertures in

Details Media position sensing system having a plurality of apertures in Media position sensing system having a plurality of apertures in

1995-05-15

1997-10-28

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

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

25055944, 250570, 346136, G01N 2186, G06K 710, G01D 1524

Patent

active

056820399

ABSTRACT:
A media position sensing system for a plotter in which a media is driven along at least one edge thereof comprising a plurality of apertures in the media positioned within the width of the edge and an optical detector positioned along the edge for sensing the appearance of the apertures in order to sense a selected position of the media. In a particular embodiment, the width of the apertures are less than one-half the width of the edge and are offset spaced from one another across the width of the edge to present an effective detection capability equivalent to a single aperture having a width equal to the width of the edge. The apertures extend along the length of the media a distance approximately equal to the width of the edge and are located near the end of the length of the media for sensing the end of the media.

REFERENCES:
patent: 3115289 (1963-12-01), Namenyi-Katz
patent: 3812375 (1974-05-01), Rempala
patent: 3919560 (1975-11-01), Nopper
patent: 3950652 (1976-04-01), Yamashita
patent: 4683380 (1987-07-01), Shipkowski et al.
patent: 4691112 (1987-09-01), Wydler

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