Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-12-27
1981-10-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250570, G01N 2186
Patent
active
042975859
ABSTRACT:
A system is disclosed which will detect flaws in spliced connections between two adjacent strips of film that are connected together by a splice. The system can, in various embodiments, detect not only a mis-positioning of the splice with respect to the strips, but can also detect whether or not the gap between the strip is too large and whether or not one of the corners of either strip is defectively formed. Additionally, the system can detect a defect arising from the folding over of one of the strips and the installation of a splice on the folded-over portion. The system utilizes radiation sources on one side of the film and radiation detectors on the other side of the film. These sources and detectors are so positioned as to be able to distinguish between the presence of a splice and the absence of a splice, and can also distinguish between the presence of a gap between two adjacent strips and can measure the gap width. By utilizing a system such as is disclosed herein, a continuous-processing machine for use with photographic film may be shut down prior to the introduction therein of a defectively spliced connection, which connection might break during processing.
REFERENCES:
patent: 3856414 (1974-12-01), Menary
patent: 4167678 (1979-09-01), Mischo et al.
Agfa-Gevaert Aktiengesellschaft
Nelms David C.
Striker Michael J.
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