Sheet feeding or delivering – Feeding – Separators
Reexamination Certificate
2000-01-27
2001-10-09
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Feeding
Separators
C271S109000
Reexamination Certificate
active
06299157
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paper feeding apparatus for a printing apparatus, and more particularly, to a paper feeding apparatus for a printing apparatus having an improved structure for picking up a sheet of paper from a cassette one-by-one, and feeding the paper into the printing apparatus.
2. Description of the Related Art
A typical printing apparatus such as a printer or copier, as shown in
FIG. 1
, is provided with a cassette
20
containing a plurality of sheets of paper S, the cassette
20
which is detachably installed at a printing apparatus
10
. A pickup roller
11
for allowing the paper S loaded in the cassette
20
to enter a paper feeding path (not shown) one-by-one, is installed in the printing apparatus
10
. When the cassette
20
is coupled to the printing apparatus
10
, a sheet of paper at the top of the paper S in the cassette
20
can contact the pickup roller
11
. However, when the paper placed at the top of the paper S loaded in the cassette
20
previously contacts the pickup roller
11
in the middle of the cassette
20
upon entering the printing apparatus
10
, as the cassette
20
is pushed further in, the paper contacting the pickup roller
11
may be displaced out of its normal position or part of the paper may become crumpled. Thus, to avoid such occurrences, a paper feeding apparatus having a structure in which the pickup roller
11
and the paper contact each other after the cassette
20
is completely installed is required.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a paper feeding apparatus for a printing apparatus having an improved structure so that a pickup roller contacts a sheet of paper after a cassette is completed installed at the printing apparatus.
Accordingly, to achieve the above objective, there is provided a paper feeding apparatus for a printing apparatus including a pickup roller which rotates in close contact with a sheet of paper loaded in a cassette which allows the paper to enter in a paper feeding path of the printing apparatus, and a moving device for allowing the pickup roller to be selectively close to or separated from the paper loaded in the cassette while moving the pickup roller up and down.
It is preferred in the present invention that the moving device includes a rotary shaft connected to a predetermined driving source, a pivoting member, installed at the rotary shaft to be capable of pivoting, having the pickup roller rotatably supported at a free end thereof, a slider, sliding in engagement with the cassette entering in the printing apparatus, having a predetermined cam portion for pivoting the pivoting member formed at one side thereof, and an engagement rib provided at the pivoting member to be capable of sliding along the cam portion of the slider, wherein, when the slider is moved as the cassette enters or is pulled from the printing apparatus, the engagement rib slides along the cam portion to pivot the pivoting member so that the pickup roller is moved up and down.
REFERENCES:
patent: 4998714 (1991-03-01), Sparer et al.
patent: 5265859 (1993-11-01), Watson et al.
patent: 5622364 (1997-04-01), Dutton et al.
patent: 5918874 (1999-07-01), Armstrong et al.
patent: 5932313 (1999-08-01), Barton
Deuble Mark A.
Ellis Christopher P.
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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