Optical density measurement apparatus in the context of labeling

Details Optical density measurement apparatus in the context of labeling Optical density measurement apparatus in the context of labeling

1989-03-24

1991-05-07

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

250205, 250548, 250557, 356434, 356445, G01N 2155, G01N 2159, G01N 2186

Patent

active

050131567

ABSTRACT:
A system to apply a bar-code label or the like upon a product or to apply a protective laminate strip or the like upon a bar-code label or the like which is already in place upon a product. The label or the protective laminate strip first is removed from a moving carrier and applied to an applicator head which, in turn, applies the label on the product or the protective laminate strip very precisely onto the label. The relative positions of the applicator head and the label, for example, are predetermined. It remains to establish the moving forward edge of the bar-code label or the protective laminate strip to be stripped from the moving carrier so that the either can be accurately placed on the applicator head, a particularly vexing problem in view of the fact that transmissivity, usually, or reflectivity of all the films involved, typically, have closely related optical characteristics. The system discloses uses pulse-width-modulated techniques (PWM) and duty cycle which overcome inherent problems that arise from those optical characteristics, e.g., wandering of sensing circuitry over time or due to temperature, moisture and the like. Hence the high sensitivity and stability needed for such purposes are provided. The system disclosed uses digital counting techniques with their stability, particularly in the context of duty cycle. The concepts herein disclosed are framed in the context of labeling devices but are broader.

REFERENCES:
patent: 2080292 (1937-05-01), Webber
patent: 3542479 (1970-11-01), Sibalis
patent: 4300689 (1981-11-01), Franklin et al.
patent: 4342906 (1982-08-01), Hyatt

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