Analog-to-digital encoder unit employing a pre-encoded film with

Details Analog-to-digital encoder unit employing a pre-encoded film with Analog-to-digital encoder unit employing a pre-encoded film with

1976-08-17

1977-10-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

331266, 250231R, H01J 314

Patent

active

040526127

ABSTRACT:
An optical encoder for use with a liquid level measuring device including a pre-encoded film strip bidirectionally translatable between a pair of film reels past a detection station. The film is driven by a sprocket coupled to the spring motor of a perforated tape level gauge, and motion translating means enable the film to be unwound smoothly in either direction. The film has a plurality of digitally encoded tracks which enable an optical detection station to provide information specifying the level of the liquid.
The motion translating means includes first and second hub members rotatably secured to a support member for rotation about the axis of a different one of the film reels, each hub member being provided with a gear portion for mutual driving engagement.
The tension maintaining means includes first and second spring members each coupled between a film reel and a hub member, and received in a central recess of the associated hub member. Each spring member comprises a spiral wound blade spring having inner and outer ends coupled, respectively, to the associated film reel and hub member.

REFERENCES:
patent: 3558861 (1971-01-01), Collins et al.
patent: 3658429 (1972-04-01), Zipin
patent: 3975633 (1976-08-01), Larkin

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