Paper separating device of the automatic document feeder

Details Paper separating device of the automatic document feeder Paper separating device of the automatic document feeder

2000-12-22

2002-10-29

Ellis, Christopher P. (Department: 3651)

Sheet feeding or delivering

Feeding

Separators

C271S124000

Reexamination Certificate

active

06471203

ABSTRACT:

FIELD OF THE INVENTION
The creation is about a separating device of the automatic document feeder, particularly for that kind which can maintain the initial paper separating function at the paper feeding speed higher than 15 ppm.
BACKGROUND OF THE INVENTION
As the time changes, nowadays the electrical products like scanner, fax, photostat, printer and etc. appear to provide the convenience for our life. Due to slow feeding speed and one piece of paper each time, the above products have long waiting time when using. So the development of the automatic paper feeding device can provide the single page separation and paper feeding to largely improve the disadvantage of the above electrical products.
Please refer to FIG.
1
A and
FIG. 1B
, which is the prior art of the automatic document feeder. A paper feeding roller
20
is located at one side of the paper case
12
, combined with a transmission mechanism
11
and connected with a paper carrying roller
10
. So the paper feeding roller
20
rotates toward the same direction with the paper carrying roller
10
. The paper carrying roller
10
can be moved downward to a paper case
12
to contact a piece of paper
13
and upward from the paper case
12
to lose contact with that paper
13
and so the paper carrying roller
10
move downward to carry paper
13
inside paper case
12
moving along the rolling tangent direction
91
to the paper feeding roller
20
to finish the automatic paper feeding.
The prior art paper separation device of automatic document feeder covers the following two mechanism. Please refer to
FIG. 2
, below the paper feeder roller
20
is a down roller
30
; the two rollers have adequate contact. Due to the down roller
30
stopping when feeding paper, the paper feeder roller
20
can only roll one piece of paper
13
to pass through the two rollers. Without paper feeding, the down roller
30
rotates with the paper feeder roller
20
so the friction is less and the life is longer. But the down roller needs the total set of forming rollers to provide the above function so the design cost is higher. While the friction slice has low cost and easy design to control, so it has been widely used in the normal paper separation device.
Please refer to
FIG. 3A
, below the paper feeder roller
20
is a down friction slice mechanism
40
. This down friction slice mechanism
40
has a down friction slice
41
to contact adequately with the paper feeder roller
20
and a elastic mechanism
42
combined on the down friction slice bottom
43
to provide an elastic force perpendicular to the rolling tangent direction
92
. Cause the friction coefficient between the material of the paper feeder roller
20
and the paper
13
is larger than that between the material of the down friction slice
41
and the paper
13
and the friction coefficient between the material of the down friction slice
41
and the paper
13
is larger than that between the paper
13
and the paper
13
, the paper feeder roller
20
can only carry one paper
13
through the paper feeder roller
20
when paper feeder roller
20
carrying more than one piece of paper. The extra pieces of paper
13
are stopped at the down friction slice mechanism
40
due to friction. When paper feeding finishes, due to lager friction, the paper feeder roller
20
rolls the paper
13
stopped at the down friction slice mechanism
40
to feed paper separately.
Please refer to
FIG. 3B
, when the paper feeder roller
20
doesn't carry paper, the paper feeder roller
20
rubs against the down friction slice
41
and thus generates an arc hollow wear
44
at the same position. When the arc hollow wear
44
is too deep, the paper jam will occur and finish the life of down friction slice
41
. High speed paper feeding will accelerate the wear to shorten the life of the down friction slice
41
and thus can't provide the satisfactory life to the consumers. So, usually the speed in this device is lower than 10 ppm to provide the satisfactory life to the consumers.
The above two paper separation devices of automatic document feeder have their disadvantages in design cost and life. So it is necessary to develop a better paper separation device of automatic document feeder.
SUMMARY OF THE INVENTION
The object of this invention is to provide a paper separation device of automatic document feeder that can decrease the design cost and elongate the life.
To reach this object, the paper separation device of automatic document feeder in this invention can be combined with a paper case loaded at least one piece of paper to provide the automatic paper separation and feeding. The paper separation device of automatic document feeder includes: a paper feeder roller, a friction slice, a first elastic component and a second elastic component.
The paper feeder roller is equipped at one side of the paper case and connected with a transmission mechanism and a paper carrying roller. So the paper feeder roller rotates the same direction with the paper carrying roller. And the paper carrying roller can move downward to the paper case to have contact with the paper and move upward to lose contact with paper. So the paper carrying roller moves downward to carry it's internal paper to move to the paper feeder roller along its rolling tangent direction.
This friction slice, with one side near the paper feeder roller and makes the paper locate between the friction slice and the paper feeder roller. Cause the friction coefficient between the material of the paper feeder roller and the paper is larger than that between the material of the friction slice and the paper and the friction coefficient between the material of the friction slice and the paper is larger than that between the paper and the paper, the paper feeder roller and the friction slice can separate the single page of paper.
The first elastic component is combined at the bottom of the friction slice to provide an elastic force perpendicular to the tangent direction and to make the friction slice approach the paper feeder roller.
The second elastic component is combined at the bottom of the friction slice to provide an elastic force contrary to the tangent direction and to make the friction slice move opposite the tangent direction.
These and other features and advantages of the present invention will be better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:


REFERENCES:
patent: 4572498 (1986-02-01), Shiozawa
patent: 4588181 (1986-05-01), Sakata et al.
patent: 4830353 (1989-05-01), Hendriks et al.
patent: 5052677 (1991-10-01), Shibata
patent: 5163668 (1992-11-01), Winship et al.
patent: 0282124 (1990-11-01), None

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