System to reduce mixing of toner and magnetic carrier

Details System to reduce mixing of toner and magnetic carrier System to reduce mixing of toner and magnetic carrier

1997-11-19

2000-12-05

Smith, Matthew S.

Electrophotography

Control of electrophotography process

Control of developing

399 55, 399228, G03G 1506, G03G 1508

Patent

active

061577944

ABSTRACT:
There is related to an image forming apparatus for forming a two-color toner image on a photosensitive body and transferring a batch of the image to a transfer material. The apparatus has a rotating and moving electrophotographic photosensitive body. Successively along a rotating direction of the photosensitive body arranged are a first developing device using a two-component developing agent constituted of a magnetic carrier and a nonmagnetic toner and a second developing device using a one-component magnetic developing agent different in color from the nonmagnetic toner. The apparatus also has a control circuit for stopping an image forming operation when a trouble occurs in an apparatus body. To prevent the carrier of the first developing device from mixing in the second developing device, a drive mechanism is provided for detaching a magnet of the second developing device from the photosensitive body to a position at which the carrier adhering from the first developing device to the photosensitive body does not mix in the second developing device by means of a magnetic force of the second developing device when the image forming operation is stopped.

REFERENCES:
patent: 4937630 (1990-06-01), Yoshikawa et al.
patent: 5003353 (1991-03-01), Nitta
patent: 5373351 (1994-12-01), Umeda et al.
patent: 5481337 (1996-01-01), Tsuchiya et al.
patent: 5610689 (1997-03-01), Kamiya et al.
patent: 5671468 (1997-09-01), Yamamoto et al.

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