Method of determining a relative speed between independently...

Details Method of determining a relative speed between independently... Method of determining a relative speed between independently...

2006-12-12

2006-12-12

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

Reexamination Certificate

active

07149449

ABSTRACT:
A method of determining a relative speed between two separately driven members in an image forming apparatus, includes the steps of: transporting a print medium using a print media transport assembly including a first nip, the print media transport assembly operable at a first transport speed; driving a rotatable member associated with a second nip at a second transport speed which is independent from the first transport speed; printing a first image on the print medium when the print medium is in at least one of the first nip and the second nip; printing a second image on the print medium when the print medium is in each of the first nip and the second nip, the second image overlapping the first image; detecting a moiré pattern caused by the first image and the second image; and determining a speed relationship between the first transport speed and the second transport speed, dependent upon the detected moiré pattern.

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