Detecting lateral position of webs

Details Detecting lateral position of webs Detecting lateral position of webs

1977-03-30

1978-08-29

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250548, 250560, G01N 2130

Patent

active

041106270

ABSTRACT:
For the lateral guidance of travelling webs, three photoelectric detectors are arranged under one margin of the web in a transverse line such that the path of light from a light source, on the other side of the web plane, to a first of the detectors is blocked by the web, the light path to a second of the detectors is partially blocked by the web, and the third detector is fully exposed to the light source, when the web is in its normal lateral position. Signals from the three detectors are combined in such a manner that a signal is derived representing the extent to which the second detector is covered by the web, the value obtained being corrected for variations in light source intensity and for web translucence.

REFERENCES:
patent: 2220736 (1940-11-01), Stockbarger et al.
patent: 4021031 (1977-05-01), Meihofer et al.

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