Method for measuring ink density

Details Method for measuring ink density Method for measuring ink density

1984-11-14

1987-12-15

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

356446, G01N 2186

Patent

active

047129182

ABSTRACT:
In a method for measuring ink density of printed sheets by means of photodiodes which scan light reflection from measuring marks provided on printed sheets, the start of a dynamic measuring process during the running of the printing machine is released by the control of impulse flanks, and the reflected light is scanned by sensors having a short response time. A medium reflection value of the surface of the measuring mark is determined. The control of impulse flanks takes place by a leading edge of the mark printed on the sheet, and the signal, released by that control, switches on the photodiodes and the light source. A changed voltage occurring at the output of each photodiode is amplified, and its peak value is stored; and the photodiodes and the light source are switched off thereafter.

REFERENCES:
patent: 4003660 (1977-01-01), Christie et al.

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