Overlaid image forming apparatus with coordinated transfer bias

Details Overlaid image forming apparatus with coordinated transfer bias Overlaid image forming apparatus with coordinated transfer bias

1992-10-29

1994-02-15

Moses, R. L.

Photocopying

Contact printing

Light boxes

355208, 355271, 355274, G03G 1501

Patent

active

052871630

ABSTRACT:
A superposed image forming apparatus wherein toner images are superposedly transferred onto a transfer material includes an image bearing member; a device for forming a toner image on the image bearing member; a transfer material carrying member, disposed opposed to the image bearing member, for carrying a transfer material in synchronism with the toner image on the image bearing member; a transfer material supplying device for supplying the transfer material to the transfer material carrying member; a transfer bias voltage source for applying to the transfer material carrying member a bias voltage for image transfer from the image bearing member to the transfer material; an attraction member for urging the transfer material to the transfer material carrying member to hold the transfer material on the transfer material carrying member; an attraction bias voltage source for applying a bias voltage to the attraction member; the bias voltage applied to the attraction member is changed in association with on-and-off of the bias voltage application to the transfer material carrying member so as to maintain a constant surface potential of the transfer material carrying member.

REFERENCES:
patent: 3976370 (1976-08-01), Goel et al.
patent: 4415256 (1983-11-01), Inoue et al.
patent: 4674860 (1987-06-01), Tokunaga et al.
patent: 4888621 (1989-12-01), Ohno
patent: 4935776 (1990-06-01), Fukui
patent: 5083167 (1992-01-01), Fukushima et al.
patent: 5084736 (1992-01-01), Suzuki et al.
patent: 5086318 (1992-02-01), Takeda et al.

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