Photocopying – Contact printing – Light boxes
Patent
1992-06-16
1994-02-15
Fuller, Benjamin R.
Photocopying
Contact printing
Light boxes
226 29, 355208, G03G 1501
Patent
active
052871622
ABSTRACT:
A detection system includes a marking device for applying to a process medium a first chevron from a first printer, a second chevron from a second printer and a third chevron from both the first printer and the second printer, the third chevron having a first element applied from the first printer and a second element applied from the second printer. The detection system further includes a detection device for detecting a matrix of times including three pluralities of times, each of the three pluralities of times corresponding to a respective time of passage of the first, second and third chevrons by the detection device. The detection system further includes a determining device for determining the alignment error based on a function of the three pluralities of times. A control system includes a marking device for applying to a process medium a first chevron from a first printer, a second chevron from a second printer and a third chevron from both the first printer and the second printer. The control system further includes a detection device for detecting a matrix of times including three pluralities of times, each of the three pluralities of times corresponding to a time of passage of a respective one of the first, second and third chevrons by the detection device, a determining device for determining an alignment error based on a function of the matrix of times, and a control device for minimizing the alignment error.
REFERENCES:
patent: 4903067 (1990-02-01), Murayama et al.
Anderson Harold M.
Castelli Vittorio R.
de Jong Joannes N. M.
Williams Lloyd
Barlow Jr. J. E.
Fuller Benjamin R.
Xerox Corporation
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