Electrostatic image forming apparatus

Details Electrostatic image forming apparatus Electrostatic image forming apparatus

1996-05-09

1999-03-30

Royer, William

Electrophotography

Control of electrophotography process

Control of transfer

399302, 399311, 399314, G03G 1501, G03G 1516

Patent

active

058900306

ABSTRACT:
In an electrostatic image forming apparatus, including a corona discharger located so as to face an image carrier on which a toner image is to be formed. When a paper or similar recording medium is brought between the image carrier and the discharger, the discharger effects corona discharge at the rear of the recording medium so as to charge the medium to a polarity opposite to the polarity of the toner image. The toner image is transferred from the image carrier to the recording medium. A polarity switcher allows a voltage of substantially the same polarity as the toner to be applied to a discharge wire included in the discharger. The apparatus is free from defective discharge and defective image transfer ascribable to the deposition of free or isolated toner on the discharger.

REFERENCES:
patent: 4843423 (1989-06-01), Nakamura et al.
patent: 5128717 (1992-07-01), Uchikawa et al.
patent: 5182604 (1993-01-01), Asai
patent: 5253022 (1993-10-01), Takeuchi et al.
patent: 5410393 (1995-04-01), Watanabe
patent: 5438398 (1995-08-01), Tanigawa et al.

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