Transfer roller and toner for electrophotographic apparatus

Details Transfer roller and toner for electrophotographic apparatus Transfer roller and toner for electrophotographic apparatus

1994-08-17

1996-07-16

Moses, R. L.

Photocopying

Contact printing

Light boxes

355210, G03G 1514

Patent

active

055371922

ABSTRACT:
A transfer device of a contact transfer method wherein a transfer power supply applies a predetermined transfer voltage to a transfer roller contacting the rear surface of a printing sheet, so that an electric field for causing the toner to be attracted by the transfer roller is generated. A lumped constant resistor is electrically inserted between the transfer roller and the transfer power supply. The lumped constant resistor has an electric resistance smaller than an equivalent electric resistance obtained when the whole transfer roller is regarded as one electric resistor. When the electric resistance of the printing sheet changes in accordance with a change in ambient environment, the voltage drop across the lumped constant resistor is changed to compensate for the change in electric resistance of the printing sheet.

REFERENCES:
patent: 4338017 (1982-07-01), Nishikawa
patent: 4401383 (1983-08-01), Suzuki et al.
patent: 4967231 (1990-10-01), Hosoya et al.
patent: 4977430 (1990-12-01), Florack
patent: 5132738 (1992-07-01), Nakamura et al.
patent: 5150165 (1992-09-01), Asai
patent: 5159393 (1992-10-01), Hiroshima et al.
patent: 5168313 (1992-12-01), Hosaka et al.
patent: 5285245 (1994-02-01), Goto et al.
patent: 5323185 (1994-06-01), Nagato et al.
patent: 5359395 (1994-10-01), Shimura et al.

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