Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1976-11-23
1978-07-04
Kominski, John
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
355 68, 356203, G01N 2130
Patent
active
040990648
ABSTRACT:
A device is provided for pretesting originals to be copied for their copyability. The device includes a photoelectric point by point scanner and a decision circuit for evaluating density scanning values from the scanner. The decision circuit compares the scanning values with the minimum scanning value and produces a clear signal when a predetermined number of scanning values exceeds the minimum value by at least a given first threshold value. If this criterion is not fulfilled a skip signal is produced. In a preferred embodiment the decision circuit produces the clear signal only if the average value of a predetermined number of highest scanning values exceeds the minimum value by at least the given first threshold value.
The pretesting device is especially suitable for use in automatic copying machines where, when interconnected in appropriate manner with the exposure control and the feed system for the originals, the clear signal and the skip signal can be used for clearing or suppressing, respectively the copying process.
REFERENCES:
patent: 3202042 (1965-08-01), Jamieson et al.
patent: 4001594 (1977-01-01), Akimoto et al.
Gretag Aktiengesellschaft
Kominski John
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