Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-05-29
1992-07-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223R, G01N 2186
Patent
active
051305585
ABSTRACT:
In an inserter, a skew and misalignment detector for measuring skew misalignment of inserts that are conveyed on and along a conveyor comprises a plurality of photosensors disposed above the insert-conveying path in transverse relation thereto and a plurality of retroreflective targets disposed beneath the insert-conveying path in transverse relation thereto and directed toward the photosensors. Inserts obstruct the targets while being conveyed thereover. The photosensor signals are sampled in synchronism with the insert-conveying motion. The obtained signals are evaluated in relation to pre-established skew rejection threshold criteria in dependence on insert conveying speed. Inserts are diverted when the skew detector arrangement provides measures of skew and misalignment of inserts that exceed rejection threshold criteria.
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Belec Eric A.
Fallos George
Hawkes Richard B.
Lee, Jr. James S.
Noll, Jr. Harry C.
Bell & Howell Company
Nelms David C.
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