Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-03-25
1987-02-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356443, G01N 904, G06M 700
Patent
active
046424563
ABSTRACT:
A double sheet detection method and apparatus for a sheet-fed rotary press is proposed wherein a theoretical reference value is set as a difference between 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 and the first theoretical amount of light; the theoretical reference value is stored in correspondence with the amount of light transmitted through a sheet; a difference is calculated between an amount of light transmitted through an nth sheet and an amount of light transmitted through an (n+1)th sheet when actual printing is performed; the theoretical reference value which corresponds to the amount of light transmitted through the nth sheet and which is defined as an actual reference value is read out; the difference calculated when actual printing is performed is compared with the actual reference value; and double sheet detection is performed in accordance with a comparison result.
REFERENCES:
patent: 3614419 (1971-10-01), Daughton
patent: 4237378 (1980-12-01), Jones
Komori Printing
Nelms David C.
Oen William L.
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