Image forming apparatus

Details Image forming apparatus Image forming apparatus

1998-04-24

1999-04-13

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of transfer

399 45, 399314, G03G 1514

Patent

active

058936610

ABSTRACT:
An image forming apparatus using the electrophotographic method in which a toner image formed on an image carrier is transferred to a transfer medium, the image forming apparatus being equipped with a fixed-voltage transfer controller that controls the transfer voltage such that it will be maintained at a prescribed voltage, a current detector that detects the transfer current, a voltage detector that detects the transfer voltage, and a switching controller that, when the transfer current detected by means of the current detector falls outside a prescribed range, switches from fixed-voltage transfer control performed by the fixed-voltage transfer controller to fixed-current transfer control in which the transfer current is controlled such that the transfer current will be maintained at a prescribed control current, the image forming apparatus performing optimal image transfer at all times by, after the switching, setting as a new voltage level the voltage level detected by means of the voltage detector while the fixed-current transfer control is active, and then returning once again to fixed-voltage transfer control by means of the fixed-voltage transfer controller.

REFERENCES:
patent: 5253022 (1993-10-01), Takeuchi et al.
patent: 5331383 (1994-07-01), Nou et al.
patent: 5546172 (1996-08-01), Seto
patent: 5729811 (1998-03-01), Takahata et al.

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