Apparatus for detecting postage stamps on envelopes

Details Apparatus for detecting postage stamps on envelopes Apparatus for detecting postage stamps on envelopes

1979-05-04

1981-07-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01V 904

Patent

active

042812437

ABSTRACT:
The apparatus for detecting a perforated postage stamp on envelopes travelling in a given direction comprises a light source to illuminate the teeth of a perforated edge of the stamp at a right angle to the given direction; a scanning device receiving light from the iluminated edge of the stamp and producing a high frequency pulse train responsive to scanning the teeth of the illuminated edge of the stamp; and an evaluating circuit responsive to the pulse train to provide an indication of the presence of the stamp.

REFERENCES:
patent: 3446978 (1969-05-01), Leavens
patent: 3780310 (1973-12-01), Hudler
patent: 3983388 (1976-09-01), Gugliotta

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