Quality inspection device for printed matter and method thereof

Details Quality inspection device for printed matter and method thereof Quality inspection device for printed matter and method thereof

1990-01-09

1991-07-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

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

356443, G01N 2186

Patent

active

050308386

ABSTRACT:
Light received by a light receiving element in a quality inspection device for printed matter, is controlled to a constant value by passing the received light through a graduated neutral density filter that is adjusted in position relative to the optical axis of the light receiving element in dependence on the feed speed of the printed matter.

REFERENCES:
patent: 3413065 (1968-11-01), Funk
patent: 4194838 (1980-03-01), Bey et al.
patent: 4522497 (1985-06-01), Ikin

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