Image forming apparatus capable of preventing a toner-filming ph

Details Image forming apparatus capable of preventing a toner-filming ph Image forming apparatus capable of preventing a toner-filming ph

1997-01-21

1998-06-30

Smith, Matthew S.

Electrophotography

Image formation

Development

399358, 399359, G03G 1506

Patent

active

057747709

ABSTRACT:
Image forming apparatus which prevents occurrence of a toner-filming phenomenon on a development roller thereof by performing a toner freshening operation. When the image forming apparatus performs the toner freshening operation, an amount of the toner remaining unused on the development roller can totally be transferred onto a photoconductive drum at a predetermined timing for a predetermined time period at a predetermined rate of frequency so as to effectively prevent occurrence of the toner-filming phenomenon. The amount of toner used for the toner-freshening operation can be kept clean and returned to the development roller in a form without agglomerating by an unused toner returning mechanism mounted in an image forming unit of the image forming apparatus. The image forming apparatus has a dust free configuration, and may further include an air fan including an electrostatic filter and a front loading type paper cassette.

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patent: 5604575 (1997-02-01), Takagaki et al.

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