Image forming apparatus, and paper feed members thereof

Details Image forming apparatus, and paper feed members thereof Image forming apparatus, and paper feed members thereof

1997-04-09

1999-01-19

Royer, William J.

Electrophotography

Document handling

Copy

492 18, 492 28, 492 53, 492 56, G03G 1500

Patent

active

058624473

ABSTRACT:
A digital copier is designed to minimize image imperfections by limiting pickup of contaminants by an image carrier. Paper sheets are conveyed to an image transfer area by use of a conveyor unit. The conveyor unit includes paper feed rollers. The image transfer area includes the image carrier and a transfer roller. The paper sheets pass between the image carrier and the transfer roller. When no paper sheets are in the image transfer area, the transfer roller is in contact with the image carrier. The transfer rollers and the paper feed rollers include a rubber material with a solubility parameter chosen to minimize transfer of contaminants to the image carrier. In one example, the transfer roller and the paper feed roller are formed from a rubber material having a solubility parameter greater than or equal to 8.2 (cal/cm.sup.3).sup.1/2. To further minimize imperfections in the image due to pickup of contaminants, the rubber material of the paper feed member has a dielectric constant greater than or equal to 4.5 and has a substituent other than hydrocarbon radicals attached to the principal polymer chain. Finally, the peripheral speed of the image carrier is designed to equal the speed of the paper sheet, while the speed of the transfer roller exceeds the speed of the paper sheet. As a result, contaminants are transferred to the transfer roller and not to the image carrier.

REFERENCES:
patent: 4053702 (1977-10-01), Erickson et al.
patent: 4412029 (1983-10-01), Kehr et al.
patent: 5669605 (1997-09-01), Sawa et al.
patent: 5733235 (1998-03-01), Waku et al.

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