Sheet advancement control system detecting fiber pattern of shee

Details Sheet advancement control system detecting fiber pattern of shee Sheet advancement control system detecting fiber pattern of shee

1989-06-08

1992-02-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250561, G01N 2186

Patent

active

050897128

ABSTRACT:
A sheet advancement control system for use in printers such as inkjet printers includes a light source for directing a beam of light onto a localized area of a sheet, a photosensitive detector for providing output signals that vary according to microscopic patterns that are illuminated within the sheet by the directed light, a correlator for determining cross-correlations between pairs of detected patterns as the sheet is advanced in a printer and for computing displacements between matching patterns to, thereby, detect the displacement of a sheet within the printer.

REFERENCES:
patent: 3914595 (1975-10-01), Tinet
patent: 3919560 (1975-11-01), Nopper
patent: 4373816 (1983-02-01), Laib
patent: 4484079 (1984-11-01), Betz et al.
patent: 4683380 (1987-07-01), Shipkowski et al.
patent: 4937593 (1990-06-01), Prats

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