Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-10-04
1985-11-26
Beck, Shrive P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, G01N 2186, G01V 904
Patent
active
045556326
ABSTRACT:
The length of film frames on successive roll films which form an elongated strip of randomly alternating roll films with shorter and longer film frames is ascertained by advancing the strip stepwise past a photoelectronic monitoring device which generates signals denoting the light transmissivity of successive increments of the strip. Signals denoting the leaders of successive film frames are stored in a sample-and-hold circuit which replaces the stored signals with signals of greater intensity when the signals of greater intensity are generated during transport of a length of strip corresponding to the length of a longer film frame. This denotes that the corresponding roll film contains shorter film frames. The circuit transmits stored signals to memories one of which is addressed cyclically and the detected signals are totalized, during the monitoring of a given roll film, to furnish information as to the total number of stored signals, the total number of longer film frames (if any) and the total number of signals (if any) which replace stored signals during the monitoring of a length of a roll film which matches the length of a longer film frame. The thus obtained information is utilized to classify the roll films as those containing longer or shorter film frames, to provide the strip with notches denoting the positions of the film frames and of the splices between successive roll films, and the ordinal numbers of roll films with shorter film frames.
REFERENCES:
patent: 4167678 (1979-09-01), Mischo et al.
patent: 4217648 (1980-08-01), Thurm et al.
patent: 4362259 (1982-12-01), Stemme
AGFA-Gevaert A.G.
Beck Shrive P.
Kontler Peter K.
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