Toner supply roll

Details Toner supply roll Toner supply roll

2005-10-04

2005-10-04

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Development

C492S056000, C492S059000, C492S017000

Reexamination Certificate

active

06952550

ABSTRACT:
A toner supply roll free from occurrence of an imaging failure. The toner supply roll comprises a shaft (1) and a urethane foam layer (2) provided on an outer peripheral surface of the shaft (1), wherein when the urethane foam layer is compressed to a depth of 1 mm from an outermost surface thereof during compression thereof to a depth of 2 mm, a stress F0occurs in the urethane foam layer and when the urethane foam layer is decompressed to a depth of 1 mm after the compression thereof to a depth of 2 mm, a stress F1occurs in the urethane foam layer, the urethane foam layer satisfies a relation represented by the following expression (1) at a temperature of 23±3° C. at a humidity of 50±10%:in-line-formulae description="In-line Formulae" end="lead"?F1/F0≧0.7  (1)in-line-formulae description="In-line Formulae" end="tail"?the stresses F1and F0being expressed by a unit of Pa.

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