Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1978-02-08
1979-09-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250560, 250561, 250571, G01N 2130
Patent
active
041676785
ABSTRACT:
Film frames of each of a series of spliced-together exposed and developed photographic films are monitored by photoelectric detector means to ascertain the positions of their leading and trailing edges prior to identification of the frames by a punching device ahead of the copying station. Those film frames whose leading and/or trailing edges cannot be detected with a requisite degree of accuracy (e.g., due to overexposure or underexposure) are pinpointed by ascertaining their length on the basis of accurately ascertained length of other film frame or frames in the same film (a) by calculating the position of the trailing edge upon accurate determination of the leading edge (or vice versa), (b) by calculating the positions of both edges on the basis of the distance between two accurately pinpointed frames which flank the frame whose edges are not detectable, (c) by measuring back from a previously pinpointed frame, or (d) by measuring forwardly from a subsequently ascertained frame.
REFERENCES:
patent: 3981579 (1976-09-01), Weinert et al.
Mischo Klaus
Paulus Rudolf
AGFA-Gevaert A.G.
Hostetter Darwin R.
Kontler Peter K.
Nelms David C.
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