Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Signalling – indicating – or display means
Patent
1977-03-07
1978-09-12
Knowles, Allen N.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Signalling, indicating, or display means
209588, 250223R, B07C 5344
Patent
active
041131053
ABSTRACT:
A device for checking supposedly emptied envelopes for documents, as the envelopes are fed in spaced end-to-end relationship past an inspection station, consists of three sensors at the inspection station arranged along a line perpendicular to the envelope path to sense the opacity of each envelope along three zones located respectively near the top, near the bottom and near the center of the envelope. The output of the center sensor serves as a reference for the top and bottom sensors and a signal processing circuit connected with the sensors produces a suspect signal, indicating the suspected presence of a document in an envelope, when the output of either the top or bottom sensor compares unfavorably with that of the center sensor for an amount of time sufficient to make the device insensitive to short duration opacity differences caused by overlapping envelope seams. Since the center sensor provides a reference signal for each individual envelope, the device is insensitive to changes in opacity from envelope to envelope due to differences in the papers from which the envelopes are made. Further, the output of the center sensor is also compared with a predetermined reference signal to detect unusually wide documents which intercept the sensing fields of all three sensors. 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: 4016980 (1977-04-01), DeHart
DeHart John R.
Krehl William H.
Nelson Larry L.
Docutronix, Inc.
Knowles Allen N.
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