Film break detector

Details Film break detector Film break detector

1980-09-08

1982-08-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

226 11, 226100, 354321, 340668, G08B 2100

Patent

active

043440738

ABSTRACT:
A photographic film processor including a film dryer through which photographic film is transported under tension and dried, has a film break detection system for detecting photographic film breaks within the dryer. Upper and lower substantially horizontal shafts are positioned in the dryer in a spaced relationship. Each shaft has a plurality of spools, and the photographic film is transported back and forth over the spools and between the shafts in a serpentine fashion. The lower shaft is spatially movable with respect to the upper shaft and is biased in a direction opposite to the force on the lower shaft due to film tension. A film break within the dryer causes a loss of film tension, which in turn causes a change in the spatial position of the lower shaft. A sensor senses this change in the spatial position of the lower shaft, activates an alarm, and shuts off the dryer drive system.

REFERENCES:
patent: 1190053 (1916-07-01), Wescott
patent: 2048182 (1936-07-01), Ybarrondo
patent: 2734104 (1956-02-01), Gollhofer
patent: 4067035 (1978-01-01), Plursch et al.
Pako Corp. "Pako Cine/Strip Processors 215 Series Dryer/Take-up Section "(Ill. Parts List)", Minneapolis, 1974.

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