Image forming apparatus

Details Image forming apparatus Image forming apparatus

1998-10-02

1999-10-19

Moses, Richard

Electrophotography

Image formation

Transfer

399303, 399314, 399389, G03G 1516

Patent

active

059702966

ABSTRACT:
An object of the present invention is to provide an image forming apparatus which prevents transfer memory from occurring and achieves a desired potential of an image carrier (photosensitive body) when forming an image in next cycle, thereby to obtain a high-quality output image.
In order to achieve the object described above, the image forming apparatus of the invention has a belt grounding device 21 which makes contact with a transfer belt 5 and is capable of switching between grounded state and ungrounded state according to the size of copy paper P. With this configuration, because only a portion not covered by the copy paper P can be grounded according the size of the copy paper P, excessive current can be prevented from flowing into a photosensitive drum 1 at this portion, thereby preventing transfer memory from occurring.

REFERENCES:
patent: 4984024 (1991-01-01), Ohkaji et al.
patent: 5119139 (1992-06-01), Torisawa
patent: 5337136 (1994-08-01), Knapp et al.
patent: 5455663 (1995-10-01), Inoue et al.
patent: 5631725 (1997-05-01), Harasawa et al.
patent: 5794110 (1998-08-01), Kasai et al.
"Elastic Semiconductor Belt Transfer System", Akira Kumon and Masaichirou Tatekawa, pp. 1-15 (Feb. 10, 1994) and English translation thereof.

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