Image forming apparatus with removal of excess toner

Details Image forming apparatus with removal of excess toner Image forming apparatus with removal of excess toner

1993-11-09

1996-06-18

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355311, 355207, 347155, G03G 2100

Patent

active

055283500

ABSTRACT:
An image forming apparatus of the electrophotographic type wherein a toner image formed on a photosensitive drum is transferred to recording paper by a transfer roller to form an image is disclosed. When the size of the toner image formed on the photosensitive drum is larger than the size of the recording paper, a portion of the toner image which projects from the recording paper is transferred to the transfer roller and will soil another sheet of recording paper supplied subsequently. Therefore, when comparison between the size of the toner image formed on the photosensitive drum and the size of the recording paper reveals a difference between them, an image forming operation is interrupted and a cleaning device is rendered operative to remove the toner from the transfer roller. Thereupon, presence or absence and the size of an image area protruding from the recording paper are determined from the image size and the recording paper size, and the number and the time of operations of the cleaning device are controlled to minimum values in accordance with the determination.

REFERENCES:
patent: 4183655 (1980-01-01), Umahashi et al.
patent: 4260236 (1981-04-01), Tsuda et al.
patent: 4384785 (1983-05-01), Katoh et al.
patent: 5132738 (1992-07-01), Nakamura et al.

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