Copying apparatus having paper inverting unit

Details Copying apparatus having paper inverting unit Copying apparatus having paper inverting unit

2001-08-29

2003-02-25

Tran, Hoan (Department: 2852)

Electrophotography

Document handling

Copy

C399S402000, C399S405000

Reexamination Certificate

active

06526255

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a copying apparatus provided with an auto document unit that inverts upside down recording paper with an image formed on one side thereof to return to an image forming section that forms an image on the recording paper.
2. Description of the Related Art
In order to automatically form images on both sides of recording paper (herein referred to as “perform doubled-sided printing”), a conventional copying apparatus is provided with auto document unit
2201
that inverts upside down the recording paper with an image formed on one side thereof to return to an image forming section that forms an image on the recording paper.
Auto document unit
2201
has, as shown in
FIG. 1
, intermediate tray
2205
which is provided on passage
2204
between paper cassette
2202
and image forming section
2203
, and which temporarily stores recording paper with an image formed on one side thereof.
That is, recording paper
2206
is taken out of paper cassette
2202
and conveyed to image forming section
2203
. An image is formed on one side of recording paper
2206
and stored once in intermediate tray
2205
. When the double-sided printing of a plurality of sheets is performed on the same original, a plurality of sheets of recording paper
2206
each with the same image formed on one side thereof are temporarily stacked and stored in intermediate tray
2205
.
Next, in order to record an image on the other side of recording paper
2206
, recording paper
2206
is taken out of intermediate tray
2205
and conveyed again to image forming section
2203
. When the double-sided printing of a plurality of sheets is performed on the same original, recording paper
2206
is sequentially taken out of intermediate tray
2205
, and the same image is formed on the other side of each paper. In this way the double-sided printing is achieved.
However, there arise a problem with the configuration of the conventional example, as follows.
Namely, in the configuration of the conventional example, a plurality of sheets of recording paper
2206
each with an image formed on one side thereof are stacked and stored temporarily in intermediate tray
2205
, and then another image is formed on the other side of each sheet. Therefore, it requires a considerable amount of time for recording paper
2206
to undergo the double-sided printing and to finally be discharged outside the apparatus, resulting in a disadvantage in efficiency.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a copying apparatus capable of forming images efficiently on both sides of recording paper.
That is, in the copying apparatus of the present invention, recording paper with an image on one side thereof formed in an image forming section is inserted into an auto document unit, where the recording paper is inverted upside down while intervals between a plurality of sheets of recording paper are adjusted at predetermined positions on an inverting path which is bent to form two pile-shaped upper and lower stages.


REFERENCES:
patent: 5857137 (1999-01-01), Sakata et al.
patent: 6188866 (2001-02-01), Barnhart
patent: 6215970 (2001-04-01), Yoshikawa et al.

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