Double sheet detection method and apparatus of sheet-fed rotary

Details Double sheet detection method and apparatus of sheet-fed rotary Double sheet detection method and apparatus of sheet-fed rotary

1984-01-30

1987-02-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356434, G01N 904

Patent

active

046424571

ABSTRACT:
Double sheet detection method and apparatus of a sheet-fed rotary press, wherein a theoretical reference value is set as an intermediate value between a first theoretical amount of light transmitted through one sheet and a second theoretical amount of light transmitted through two sheets, respectively; the theoretical reference value is subtracted from the first amount of light to obtain a theoretical subtracted value; the theoretical subtracted value is subtracted from an actual amount of light transmitted through one sheet to obtain an actual reference value; and an actual amount of light transmitted through a current sheet is compared with the actual reference value to perform double sheet detection.

REFERENCES:
patent: 3614419 (1971-10-01), Daughton et al.
patent: 4237378 (1980-12-01), Jones

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