Method and apparatus for monitoring the passage of marks on a we

Details Method and apparatus for monitoring the passage of marks on a we Method and apparatus for monitoring the passage of marks on a we

1988-04-28

1989-08-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, 101181, G01N 2186, G06K 1500

Patent

active

048577456

ABSTRACT:
A method and apparatus for monitoring the passage of a mark on a web. The web is caused to move through a detection station at which at least that portion of the web carrying the mark is illuminated. An image of the mark is projected onto a quadrant array of photodetector elements at the detection station. The axes defined between the elements are transverse to the direction of movement of the web. The times t.sub.1, t.sub.2 at which substantially equal areas of a mark are projected on either side of the axes are determined which provides an indication of registration of the web.

REFERENCES:
patent: 4142105 (1979-02-01), Erdmann
patent: 4370059 (1983-01-01), Masuda
patent: 4484522 (1984-11-01), Simeth
patent: 4485982 (1984-12-01), St. John et al.
patent: 4518856 (1985-05-01), Blackington
patent: 4683380 (1987-07-01), Shipkowski et al.

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