G - Physics – 08 – B
Patent
G - Physics
08
B
340/123.7
G08B 1/08 (2006.01) G07D 11/00 (2006.01)
Patent
CA 1306032
APPARATUS FOR DETECTING THE PASSAGE OF MULTIPLE SUPERPOSED SHEETS ALONG A FEED PATH Abstract of the Disclosure 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 said output voltage during one revolution of the fixed axis roller, and subtracting circuits (162, 172) subtract the reference voltage from said 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 said difference value exceed a predetermined value.
593061
Ncr Corporation
Smart & Biggar
LandOfFree
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