Sheet feeding or delivering – Feeding – With means to interrupt feeding
Patent
1988-11-08
1991-01-08
Bollinger, David H.
Sheet feeding or delivering
Feeding
With means to interrupt feeding
271262, 364563, B65H 712
Patent
active
049829475
ABSTRACT:
A linear variable differential transformer (42) produces an output voltage which varies linearly with movement of the axis of a movable axis roller (14) relative to the axis of a fixed axis roller (12) brought about by the passage of a sheet between the rollers. Circuits (154, 189) store a reference voltage representative of a minimum value of the output voltage during one revolution of the fixed axis roller, and subtracting circuits (162, 172) subtract the reference voltage from the output voltage when a single or multiple sheet is passing between the rollers so as to produce a difference value representative of the thickness of this sheet. A processor (178) samples the difference value a plurality of times during one revolution of the fixed axis roller, and provides an indication that a multiple sheet has passed between the rollers if at least a predetermined number of consecutive samples of the difference value exceed a predetermined value.
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U.S. Ser. No. 094,986, filed Sep. 10, 1987, assigned to NCR Corporation, entitled, "Apparatus for Detecting the Passage of Multiple Superposed Sheets along a Feed Path", Douglas L. Milne.
U.S. Ser. No. 245,200, filed Sep. 16, 1988, assigned to NCR Corporation, entitled, "Apparatus for Detecting the Passage of Multiple Superposed Sheets along a Feed Path", Douglas L. Milne.
Bollinger David H.
Hawk Jr. Wilbert
NCR Corporation
Sessler Jr. Albert L.
Wargo Elmer
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