Transparency sheet edge detector system using edge shadow sensin

Details Transparency sheet edge detector system using edge shadow sensin Transparency sheet edge detector system using edge shadow sensin

1997-09-04

1999-01-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

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

250223R, G01N 2186

Patent

active

058594400

ABSTRACT:
A dual mode non-contact optical sheet edge detection system for detecting either fully transparent or regular sheets being fed in a sheet transport path of a reproduction system, with an illumination source for illuminating the potential sheet edge area at an angle to generate a detectable sheet edge shadow from transparent sheets, and an optical detection system remotely detecting the generated edge shadow to provide sheet edge location or timing information to a control system. Preferably the sheet edge is held spaced above the illuminated sensor an illuminated sensor target area to enhance the shadow effect.

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patent: 5309515 (1994-05-01), Troung et al.
patent: 5329338 (1994-07-01), Merz et al.
patent: 5521692 (1996-05-01), Bares

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