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US 5,177,538 AGranted
Phenolic graphite donor roll
AssigneeXerox Corporation
InventorsJoseph Mammino, Dennis A. Abramsohn, Donald S. Sypula
Life of this patent
Estimating the term…
Abstract
A printer has a donor roll formed by mixing resin particles with conductive particles and subsequently extruding or centrifugally casting the mixture into a cylindrical shell. The shell is cut to the desired length and journals are attached to each end of the shell. The resin particles are thermoset particles preferably phenolic resin particles, and the conductive particles are preferably graphite particles.
Claims18
An electrostatographic printer comprising:
- a photoreceptor;
- charging means for creating a latent image on said photoreceptor;
- developer applying means for applying developer material to said photoreceptor;
- transfer means for transferring said applied developer material to a sheet of support material;
- wherein said developer applying means comprises:
- a donor roll in a developer sump, the donor roll comprising a homogenous mixture of a thermoset and a conductor, said roll comprising from about 6% to about 25% by weight of conductor.
3 more elements
An electrostatographic printer comprising:
- a photoreceptor;
- charging means for creating a latent image on said photoreceptor;
- developer applying means for applying developer material to said photoreceptor;
- transfer mean for transferring said applied developer material to a sheet of support material;
- wherein said developer applying means comprises:
- a donor roll in a developer sump, the donor roll comprising a homogeneous mixture of a thermoset and a conductor,
- said donor roll mixture further comprises a lubricant selected from zinc oxide, titanium oxide, tin oxide and molybdenum disulfide.
4 more elements
An electrostatographic printer comprising:
- a photoreceptor;
- charging means for creating a latent image on said photoreceptor;
- developer applying means for applying developer material to said photoreceptor;
- transfer means for transferring said applied developer material to a sheet of support material;
- wherein said developer applying means comprises:
- a donor roll in a developer sump, the donor roll comprising a homogeneous mixture of a thermoset, a conductor and molybdenum disulfide.
3 more elements
Dependencies are inferred from the claim text.