Print media thickness measurement system

Details Print media thickness measurement system Print media thickness measurement system

2006-01-10

2006-01-10

Walsh, Donald P. (Department: 3653)

Sheet feeding or delivering

Feeding

With means to interrupt feeding

C271S265040, C194S353000, C209S603000, C702S097000

Reexamination Certificate

active

06983934

ABSTRACT:
A low cost, fully automatic, thickness detection system, readily integrated into an existing paper path sheet transport, in which a regular and known small displacement signal is generated, compared, combined and/or superimposed on the signals from the small displacement of a sheet transport element with differences in sheet thickness. Even sub-millimeter sheet thicknesses can be measured of sheets moving through a regular sheet feeding nip with nip idler roller displacement using a low-cost sensor, where that sensor is additionally repetitively actuated by known small movements to provide calibration signals, such as those provided by plural small radius differences of a rotating idler roller shaft area which will enable existing idler and idler shaft run-out movement error noise signals to be overcome.

REFERENCES:
patent: 3603680 (1971-09-01), Barton
patent: 3627311 (1971-12-01), Spinelli
patent: 2004/0099042 (2004-05-01), Gustafson et al.
patent: 10-120246 (1998-05-01), None
“Xerox Disclosure Journal,” publication of Mar./Apr. 1983, vol. 8, No. 2, pp. 163-164.

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