Film sensing apparatus

Details Film sensing apparatus Film sensing apparatus

1976-03-26

1977-08-02

Swann, III, Glen R.

Communications: electrical

Systems

Call station

53 78, 226 37, 242 57, 242 7543, G08B 2100

Patent

active

040400433

ABSTRACT:
As film is being drawn off a rotatable supply reel, an apparatus indicates the presence of a predefined amount of film material remaining on the reel. In the absence of a designated quantity present on the film reel, a sensing device in proximity to the reel imparts a signal to a reel braking device for de-energizing the film roller. When the braking device moves to engage the film reel, an additional sensing device responds to the angular displacement between the brake and the film reel during braking action to monitor film tension.

REFERENCES:
patent: 3202376 (1965-08-01), Dutro et al.
patent: 3492732 (1970-02-01), Heiler et al.
patent: 3913855 (1975-10-01), Heimlicher et al.

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