Electrophotography – Document handling – Copy
Reexamination Certificate
2002-04-23
2004-06-15
Ngo, Hoang (Department: 2852)
Electrophotography
Document handling
Copy
C399S402000
Reexamination Certificate
active
06751438
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Application No. 2001-60981, filed Sep. 29, 2001, in the Korean Industrial Property Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paper feeding apparatus and method of use in a printer, and more particularly, to a paper feeding apparatus and method capable of printing images on both sides of a sheet of paper by improving a feeding path of the sheet of paper.
2. Description of the Related Art
Referring to
FIG. 1
, in a conventional printer, a paper supplying cassette
11
in which paper is stacked is installed at the bottom of a main body
10
. The paper in the cassette
11
is picked-up, sheet by sheet, by a pick-up roller
12
. The picked-up sheet is transferred along a predetermined feeding path P
1
to a developing section
15
by a feeding roller
13
. The developing section
15
comprises an electrification roller
17
, a photosensitive roller
16
, a developing roller
18
and a transfer roller
19
. The photosensitive roller
17
is electrified to a desired electric potential by the electrification roller
16
, and electrostatic latent images, which correspond to the desired images, are formed on the electrified surface by a laser scan unit
20
. Toner supplied by the developing roller
18
is transferred to the electrostatic latent area. The formed toner image is transferred and printed to a sheet moving between the photosensitive roller
17
and the transfer roller
19
.
The image printed on the sheet is fixed at a high temperature while passing through a fixing section
21
, and the sheet is ejected along an ejecting path P
2
to the exterior of the main body
10
by an ejecting roller
22
.
In the case of duplex printing, the sheet, on one side of which an image is printed, is fed along the ejecting path P
2
such that a trailing end is held by the ejecting roller
22
. The sheet is then fed along a reversing path P
3
by counter rotation of the ejecting roller
22
. There is a guide member
23
to guide the feed direction of the sheet between the ejecting path P
2
and the reversing path P
3
.
The sheet delivered to the reversing path P
3
is again fed along the feeding path P
1
by the pick-up roller
12
and the feeding roller
13
, to the developing section
15
, where an image is printed on the other side of the sheet. Further, the duplex printed sheet is ejected through the fixing section
21
and the ejecting path P
2
to the exterior of the main body
10
.
In the conventional printer in the case of duplex printing, the first sheet is fed along the feeding path P
1
and an image is formed on one side thereof at the developing section
15
. Subsequently, it is again fed along the ejecting path P
2
, the reversing path P
3
and the feeding path P
1
to the developing section
15
to print an image on the other side thereof. Therefore, it takes a relatively long time to print images on both sides of the sheet, resulting in low printing speed.
In order to solve the above problems, shortening the feeding path of the sheet has been considered, however, this method causes the sheet to be heated at a high temperature by the fixing section
21
. This causes the surface temperature of the photosensitive roller
17
to increase, thereby affecting the toner, which is sensitive to temperature. Thus, the function of the toner is adversely affected.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a paper feeding apparatus and method of use in a printer, which is capable of increasing the efficiency printing.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
The foregoing and other objects of the present invention are achieved by providing a paper feeding apparatus for use in a printer, including a sheet feeding path between a sheet feeding section and a developing section; a sheet ejecting path disposed such that a plurality of sheets on which an image is printed at the developing section is fed to the sheet ejecting path via a fixing section and an ejecting roller; a reversing path to feed the sheets from the sheet ejecting path to the sheet feeding path; a reversing tray disposed between the sheet ejecting path and the reversing path to feed the sheets from the reversing path to the sheet feeding path; and a guide member rotatably mounted between the sheet ejecting path and the reversing tray, to direct the sheets to the sheet ejecting path or the reversing tray and to guide the sheet from the reversing tray to the reversing path.
The foregoing and other objects of the present invention are also achieved by providing a paper feeding method to duplex print in a printer, the method including: sequentially feeding a plurality of sheets including an n
th
paper unit from a sheet supplying section to a developing section; printing images at the development section on a first side of the sheets including the n
th
paper unit; sequentially reversing the printed sheets; feeding the reversed sheets to the developing section at an interval; feeding sheets including an n+1
th
paper unit, interposed between adjacent ones of the reversed sheets of the n
th
paper unit; and printing images at the development section on a second side of the sheets including the n
th
paper unit and ejecting the printed sheets, to an exterior of the printer.
REFERENCES:
patent: 4990965 (1991-02-01), Kiya
Ngo Hoang
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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