Sheet feeding or delivering – Feeding – Pack holders
Reexamination Certificate
2001-03-08
2002-12-31
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Feeding
Pack holders
C271S160000
Reexamination Certificate
active
06499736
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paper feeder, and more particularly, to a paper feeder for papers with different thickness.
2. Description of the Prior Art
Please refer to
FIG. 1
of a schematic diagram of a paper feeder
10
according to the prior art. The paper feeder
10
includes a plurality of pickup rollers
12
, a replaceable friction pad
14
, a pickup shaft
16
, a movable paper holder
18
, a base plate
22
positioned under the movable paper holder
18
, and a spring
26
(shown in
FIG. 2
) positioned between the movable paper holder
18
and the base plate
22
.
Please refer to FIG.
2
and
FIG. 3
of the side views of the paper feeder
10
without and with the presence of paper, respectively. One end of the spring
26
is fixed to a bottom surface of the movable paper holder
18
while the other end is fixed to an upper surface of the base plate
22
. Depending on whether paper is present in the paper feeder
10
, the spring
26
is subjected to different stresses while the movable paper holder
18
is subjected to different reaction forces. For instance, a small amount of paper on the movable paper holder
18
creates a comparatively smaller amount of force on the movable paper holder
18
by the pickup rollers
12
. Under such condition the force is not large enough to collect the paper properly so misfeeding may happen. A large amount of papers on the movable paper holder
18
creates a comparatively larger amount of force on the movable paper holder
18
by the pickup rollers
12
. Under such condition the force is too large so multi-feeding may happen. Please refer to
FIG. 4
of a schematic diagram of the required pressing forces of the paper feeder
10
for papers
202
,
204
,
206
,
208
, and
210
with different thickness. For example, paper
202
has the greatest thickness and a pressing force between 12 to 70 grams is suitable for collecting one sheet of paper, whereby a pressing force of less than 12 grams may lead to misfeeding, and a pressing force greater than 70 grams may lead to multi-feeding. According to the degree of stress on the spring
26
, the pressing force provided by the pickup rollers
12
is between 10 to 30 grams. When the pressing force is between 10 to 12 grams, the pickup rollers
12
cannot collect the paper
202
; when the pressing force is between 25 to 30 grams, the pickup rollers
12
may collect more than a single sheet of paper
210
.
Due to the wide range in pressing force, the pickup rollers
12
can only correctly collect the papers
204
,
206
and
208
, whereby use of other types of paper can lead to multi-feeding or misfeeding. Thus, the paper feeder
10
is not very convenient for users who require the use of various types of paper.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a paper feeder with a smaller range in pressing force than the paper feeder of the prior art and it is suitable for handling paper with different thickness.
In accordance with one embodiment of the present invention, a paper feeder includes a base plate, a movable paper holder with a pivot fixed to the base plate and a rotating end positioned above the base plate in a rotatable way, a chute set on the bottom or the upper side of the movable holder, and an elastic device or a swing arm with one end positioned within the chute in a slidable way.
It is an advantage of the present invention that with or without paper, the pressing force provided by the pickup rollers is comparatively closer in range so that the paper feeder is suitable for handling paper of different thickness.
These and other objectives of the present invention will no doubt become obvious to those of the ordinary skill in the art after reading the following detailed description of the preferred embodiment which is illustrated in the various figures and drawings.
REFERENCES:
patent: 4049257 (1977-09-01), Bell et al.
patent: 4429863 (1984-02-01), Itoh et al.
patent: 4623138 (1986-11-01), Sakamaki et al.
patent: 4765605 (1988-08-01), Abbott
patent: 4852869 (1989-08-01), Watanabe et al.
patent: 5029838 (1991-07-01), Kunihiro
patent: 6039315 (2000-03-01), Lim
patent: 0330276 (1989-08-01), None
patent: 0191345 (1987-08-01), None
patent: 0028428 (1990-01-01), None
patent: 403249024 (1991-11-01), None
Richard Carter Benson, Spring Ramp Paper Tray with Constant Lead Edge Height, Dec. 1980, Xerox, vol. 5 No. 6, p. 593.
Benq Corporation
Ellis Christopher P.
Hu Winston
Ridley Richard
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