Sheet feeding or delivering – Feeding – Separators
Reexamination Certificate
2000-04-20
2001-10-23
Skaggs, H. Grant (Department: 3651)
Sheet feeding or delivering
Feeding
Separators
C271S021000, C271S127000, C271S170000
Reexamination Certificate
active
06305683
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved front loading type of automatic paper feeding apparatus for preventing the skewing of paper being fed, by providing a paper aligning device for aligning the paper before the paper feeding.
2. Description of the Related Art
Generally, an image forming apparatus such as an ink jet printer, etc. employs an automatic paper feeding apparatus for feeding a sheet of paper. In such an image forming apparatus, a so-called “paper skew” may occur due to the skew paper feeding, resulting in a skewed image printed on the paper.
The paper skew is caused by an unsmooth paper path due to a system or assembling error, or by an unstable positioning of the paper in a paper feeding apparatus.
FIGS. 1
to
3
show the above-mentioned problems of the related art. Referring to
FIG. 1
, a lever
2
and a bevel gear
3
are driven by the movement of a carriage
1
, and as shown in
FIG. 2
, a cam
5
is moved by a shaft
4
to thereby push a knock-up plate
6
upward and press the paper (P) into tight contact with a feed roller
7
.
Next, in the above position, the carriage
1
rotates the feed roller
7
toward a paper feeding position (counterclockwise direction in FIG.
2
). Accordingly, the paper (P) is picked up, conveyed along a guiding rib
8
, and stopped at the printing position. Then, the carriage
1
leaves from the pickup position, to perform the printing operation. In such a situation, by the movement of a separator
9
, the top paper of a plurality of loaded paper, that is in direct contact with the feed roller
7
, is picked up first.
In such a structure, when the paper (P) is not orderly arranged in a cassette
10
, the paper (P) is firmly secured by the feed roller
7
during the movement of the cam shaft
4
and the cam
5
in the skewed state, and as the feed roller
7
is rotated, the skewed paper (P) is conveyed to the printing operation. Accordingly, the image is also skewed when printed on the skewed paper (P).
SUMMARY OF THE INVENTION
The present invention has been developed to overcome the above-mentioned problems of the related art, and accordingly, it is an object of the present invention to provide an improved automatic paper feeding apparatus for preventing a printing deterioration due to a paper skew which is caused due to a careless paper loading, by horizontally aligning the paper before the pick up and printing operation.
In order to accomplish the above object, in a front loading type of automatic paper feeding apparatus including: a paper storing and separating section for storing paper to be fed and for separating the sheets of paper one by one; a cam device for raising and lowering the paper storing and separating section; and a feeding section having a feed roller which rotates to separate a sheet of paper from the paper storing and separating section and to convey the separated sheet of the paper to the printing position, the automatic paper feeding apparatus for preventing a paper skew according to the present invention further includes an aligning roller for aligning the paper by pushing each sheet of paper stored in the paper storing and separating section to a paper feeding position, the aligning roller pivoting in contact with the paper for paper aligning before the feed roller comes into contact with the paper; a slip section formed of a slip gear which is disposed on the aligning roller shaft for providing a rotational force to the aligning roller; a feed gear for providing a driving force to the slip gear; a holder lever for pivoting the feed roller, the holder lever on which the slip gear and aligning roller are disposed to variably perform the paper aligning operation and pickup operation; and an elastic member opposed to the aligning roller, for providing a certain force to the aligning roller for the paper aligning operation.
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patent: 5893555 (1999-04-01), Kawada et al.
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Bushnell , Esq. Robert E.
Samsung Electronics Co,. Ltd.
Skaggs H. Grant
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