Transfer roller with resistivity range
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United States of America Patent
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Dec 5, 2006
Grant Date -
Jul 1, 2004
app pub date -
Oct 3, 2003
filing date -
Oct 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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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.
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