Sheet feeding or delivering – Feeding – With means to interrupt feeding
Patent
1977-12-23
1979-07-10
Schacher, Richard A.
Sheet feeding or delivering
Feeding
With means to interrupt feeding
B65H 712
Patent
active
041605462
ABSTRACT:
An apparatus and process for detecting overlapped documents in a document processing apparatus by detecting the translucency of the documents. The disclosed apparatus includes a transport path for guiding documents and drive wheels for moving the documents along the transport path. Four LED (light source) phototransistor (light detector) pairs are located across the transport path. One LED-phototransistor pair is used together with electronics to detect when a document is present. Two LED-phototransistor pairs are used together with edge detection electronics to detect sudden significant changes in document translucency from the immediately previous translucency of the same document as the documents pass thereby. The other LED phototransistor pair is used together with level detect electronics to sample and hold the translucency level at the beginning of each document, and then to detect when the present translucency level of the document exceeds predetermined guardbands on either side of the translucency level at the beginning of the document as the documents pass thereby. Overlap indicating electronics indicates overlapped documents when the outputs of the two edge detects and the level detect are continuously coincident for 1 millisecond, and then the output of the level detect remains continuously present for an additional 5.6 milliseconds.
REFERENCES:
patent: 3026419 (1962-03-01), Aweida
patent: 3186708 (1965-06-01), Hinz
patent: 3578315 (1971-05-01), Milford
patent: 3778051 (1973-12-01), Allen
McMillan Andrew H.
Wisner Daniel A.
Burroughs Corporation
Fissell, Jr. Carl
Kaner Robert L.
Peterson Kevin R.
Schacher Richard A,.
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