Apparatus for printing images on both sides of an image printing

Details Apparatus for printing images on both sides of an image printing Apparatus for printing images on both sides of an image printing

1996-02-01

1998-12-08

Ramirez, Nestor R.

Electrophotography

Control of electrophotography process

Control of transfer

399306, G03G 1516

Patent

active

058483233

ABSTRACT:
In an electrostatic both-side printing system, a first image forming unit is provided upstream of an image printing medium when viewed in the transporting direction of the image printing medium, and a second image forming unit is provided downstream of the image printing medium. A medium transporting path for transporting the image printing medium is formed between the first and the second image forming units. A first transferring unit, located facing the first image forming unit with the medium transporting path intervening therebetween, for applying no charge onto the rear side of the image printing medium, which does not face the first image forming unit. A second transferring unit being located facing the second image forming unit with the image printing medium with the medium transporting path intervening therebetween, in a state that the second transferring unit is apart from a first toner image formed on the image printing medium by the first image forming unit. In the both-side printing system thus constructed, the first and the second image forming units, and the first and the second transferring units cooperate to form first and second toner images on both sides of the image printing medium, the first and the second toner images being opposite in polarity.

REFERENCES:
patent: 3580670 (1971-05-01), Bhagat
patent: 4958187 (1990-09-01), Tsuchiya et al.

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