Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1984-12-21
1986-09-09
Grimley, Arthur T.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3TR, G03G 1500
Patent
active
046105301
ABSTRACT:
A capacitive paper property sensor for sensing the moisture content of copy sheets in a xerographic system in which a copy sheet feed roll pair are made overlong to provide a non-feeding nip segment in addition to the feeding nip segment; a capacitor in each non-feeding and feeding nip segment with the capacitor plates thereof in substantially the same plane as the roll surface, each capacitor providing capacitance signals reflecting the current size of the roll nip in both the non-feeding and feeding nip segments; comparator means for comparing the capacitance signal output of one capacitor with the capacitance signal output of the other capacitor to provide a signal representative of the moisture content of the copy sheet passing through the roll nip; a memory for storing various moisture content/control signal relationships to thereby enable the moisture signal to be converted to a control signal; and control means for adjusting at least one of the xerographic system operating components in response to the control signal.
In a second embodiment, the capacitor in the feeding nip segment comprises a succession of capacitors across the length of the feeding nip segment to provide a profile of the copy sheet moisture content across the sheet width.
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Banton Martin E.
Lehmbeck Donald R.
Grimley Arthur T.
McMullen Frederick E.
Warren David
Xerox Corporation
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