Optics: measuring and testing – By shade or color – Trichromatic examination
Reexamination Certificate
2007-04-18
2009-06-16
Chowdhury, Tarifur R. (Department: 2886)
Optics: measuring and testing
By shade or color
Trichromatic examination
C250S22300B, C250S221000, C250S559400
Reexamination Certificate
active
07548316
ABSTRACT:
A lead edge and/or trail edge sheet curl sensing and constraint method and system. First and second light emitters and detector pairs are aligned such that the light beams from the first light emitter and second light emitter cross at the transport media sheet substrate path, which constitutes the path of a media sheet substrate with zero curl. A media sheet substrate with either positive or negative curl on the lead edge of the sheet substrate interrupts light beams from the first and second light emitters, as detected by first and second light detectors. A similar approach can be used to detect the trail edge curl. The time delay between the light beam interruptions is proportional to the sheet substrate curl, and the order of interruptions indicates whether the sheet substrate curl is positive or negative. A first pair and a second pair of substrate constraint rollers can also be provided in the paper path upstream and downstream of the sensing system. The roller pairs closest to the sensor are made of relatively non-deformable materials or of materials of similar elasticity so that different media are constrained in the sensor zone with the same sheet trajectory relative to the nip.
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Borton Michael D.
Castillo Ruddy
Mandel Barry Paul
Ossman Kenneth R.
Wallace Stanley J.
Akanbi Isiaka O
Chowdhury Tarifur R.
Lopez Kermit D.
Ortiz Luis M.
Shelby William B.
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