Classifying – separating – and assorting solids – Electrostatic
Patent
1975-05-09
1977-04-12
Reeves, Robert B.
Classifying, separating, and assorting solids
Electrostatic
209 74M, 250223R, 356 73, B07C 510
Patent
active
040169804
ABSTRACT:
A device for inspecting envelopes for enclosed contents consists of a conveyor for feeding the envelopes one at a time past an inspection station whereat the opacity of an envelope is sensed at two zones spaced from one another along a line perpendicular to the direction of envelope movement. The signals produced by the sensors are processed to produce a signal indicating the suspected presence of a document within an envelope as a result of differences in the opacities sensed by the two sensors and caused by such enclosed document, the system however compensating for opacity changes caused by seams in the envelopes and by differences in the opacities of the materials from which different envelopes are made. A gate mechanism operable in response to the production or non-production of a suspect signal as each envelope passes the inspection station segregates envelopes suspected of containing documents from those not so suspected.
REFERENCES:
patent: 3003631 (1961-10-01), Stock
patent: 3052350 (1962-09-01), Marcovitz et al.
patent: 3365699 (1968-01-01), Foster
patent: 3496370 (1970-02-01), Haville et al.
patent: 3799337 (1974-03-01), Green
patent: 3827812 (1974-08-01), Heimman
DeHart John R.
Nelson Larry L.
Docutronix, Inc.
Reeves Robert B.
Rolla Joseph J.
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