Optical hole seeking apparatus having dual spaced laser scanners

Details Optical hole seeking apparatus having dual spaced laser scanners Optical hole seeking apparatus having dual spaced laser scanners

1988-11-16

1992-03-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 356431, G01N 2188

Patent

active

050952145

ABSTRACT:
An optical hole seeking apparatus for webs (17) advanced in their longitudinal direction has two laser scanning devices (12, 15) which are arranged spaced apart along the web with a respective light receiving arrangement (11, 14) operating in reflection being associated with each laser scanning device. The two light receiving arrangements (11, 14) are connected to an electronic processing circuit (18) in which the two received photoelectric signals detected at the same position of the web (17) are correlated and then investigated to see whether they are the same or not.

REFERENCES:
patent: 2864277 (1958-12-01), Eichorn
patent: 3331963 (1967-07-01), Lippke
patent: 4310250 (1982-01-01), Sick et al.
patent: 4389575 (1983-06-01), Cole
patent: 4728800 (1988-03-01), Surka
patent: 4737649 (1988-04-01), Naruse

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