Transfer roller with resistivity range

Details Transfer roller with resistivity range Transfer roller with resistivity range

2006-12-05

2006-12-05

Tran, Hoan (Department: 2852)

Electrophotography

Image formation

Transfer

C492S048000, C492S053000

Reexamination Certificate

active

07146125

ABSTRACT:
An electrographic machine has a transfer station where a toner image is transferred to a receiver sheet. That sheet travels at a high speed of more than 15 inches per second and up to as high as 35 inches per second. A transfer roller has a metal core and an elastomeric sleeve with a resistivity selected to optimize transfer of toner at high speeds. The resistivity of the sleeve is selected to be high enough to support transfer of the toner but not so high as to cause the surface voltage to exceed the breakdown voltage of the dielectric material that includes the elastomeric sleeve, the receiver sheet, the toner and the photoconductor.

REFERENCES:
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patent: 5745820 (1998-04-01), Iwakura et al.
patent: 5909611 (1999-06-01), Iwakura
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patent: 5923937 (1999-07-01), Thompson et al.
patent: 6081686 (2000-06-01), Abe et al.
patent: 6097913 (2000-08-01), Ichihara
patent: 6097923 (2000-08-01), Iwakura et al.

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