Optical ribbon edge sensor having means for adjusting the switch

Details Optical ribbon edge sensor having means for adjusting the switch Optical ribbon edge sensor having means for adjusting the switch

1987-07-21

1988-08-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356400, G01N 2186

Patent

active

047679336

ABSTRACT:
An adjustable optical ribbon edge sensor having a relatively short throat for ease of loading a towel ribbon in a high-speed line printer includes one or more pairs of photosensitive switches, coupled through a variable resistor, to a comparator facilitates accurate and repeated detection of the ribbon edge regardless of the color of the ribbon. By adjusting the variable resistor, the comparator is biased for the particular color ribbon in use.

REFERENCES:
patent: 4029419 (1977-06-01), Schumann, Jr. et al.
patent: 4573059 (1986-02-01), Shinma et al.
patent: 4671661 (1987-06-01), Ott

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