Electrophotography – Document handling – Copy
Reexamination Certificate
1999-09-03
2001-09-11
Chen, Sophia S. (Department: 2852)
Electrophotography
Document handling
Copy
C399S315000
Reexamination Certificate
active
06289199
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image forming apparatus of a copying machine, printer or the like using an electrophotographic system or an electrostatic recording system, particularly to an image forming apparatus having a separation member contacting with an image bearing body.
2. Related Background Art
FIG. 12
shows the above image forming apparatus. That is,
FIG. 12
is a schematic block diagram of a conventional image forming apparatus. In
FIG. 12
, symbol (reference numeral)
1
denotes an image bearing body (amorphous silicon) for forming an electrostatic latent image,
2
denotes a primary charging device for electrifying the surface of the image bearing body
1
,
3
denotes a laser beam for forming an electrostatic latent image on the image bearing body
1
by irradiating the image bearing body
1
,
4
denotes a developing device for forming a toner image on the image bearing body
1
by applying a voltage between a developing sleeve
4
a
and the image bearing body
1
and developing an electrostatic latent image,
10
denotes a pre-transfer charging device for uniforming the charge of a toner image formed on the image bearing body
1
,
8
denotes a transfer charging device for transferring a toner image formed on the image bearing body
1
to a transfer material
9
,
5
and
6
denote first and second separation charging devices for separating the transfer material
9
from the image bearing body
1
,
7
denotes a separation claw for separating the transfer material
9
which cannot be separated by the first separation charging device
5
and second separation charging device
6
,
11
denotes a cleaning device for removing the toner (residual toner after transferring) with remains on the image bearing body
1
and is not transferred to the transfer material
9
, and
12
denotes a semiconductor laser for emitting the laser beam
3
modulated by a image signal. The laser beam
3
is reflected by a rotational polygon mirror
14
to raster-scan the image bearing body
1
through a focusing lens
16
and a reflecting mirror
17
.
Thus, an image forming apparatus having the above configuration makes it possible to obtain an image formed object by applying the image forming process including charging, optical image exposure, and development to the image bearing body
1
to form an image and then transferring the image to the transfer material
9
, and fixing the transferred image in the transfer material
9
.
In the case of the above conventional image forming apparatus, it is possible to securely separate the transfer material
9
from the image bearing body
1
by the separation claw
7
and thereby, preferable paper conveying causing no paper jam is realized. However, there are problems that residual toner attaches to the separation claw
7
and coheres and then, the cohered toner drips onto the transfer material
9
(hereafter referred to as dripping) and contaminates the image on the transfer material
9
.
FIG. 13
schematically shows the dripping state.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an image forming apparatus in which toner is not accumulated in a separation member.
It is another object of the present invention to provide an image forming apparatus comprising:
an image bearing body for bearing a toner image;
transfer means for transferring a toner image on an image bearing body to a transfer material;
a separation member for separating a transfer material from the image bearing body by contacting with the image bearing body; and
voltage applying means for applying a voltage having an AC component to the separation member.
The other objects will become more apparent from the following description.
REFERENCES:
patent: 4412732 (1983-11-01), Ogata et al.
patent: 4579441 (1986-04-01), Hart et al.
patent: 4739363 (1988-04-01), Hoshika et al.
patent: 5557389 (1996-09-01), Sato et al.
patent: 5621513 (1997-04-01), Pitts et al.
patent: 5943530 (1999-08-01), Ozasa
patent: 2 296 471 (1996-07-01), None
patent: 59-125763 (1984-07-01), None
patent: 2-96787 (1990-04-01), None
patent: 3-118580 (1991-05-01), None
Canon Kabushiki Kaisha
Chen Sophia S.
Fitzpatrick ,Cella, Harper & Scinto
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