Sheet feeding or delivering – Feeding – Separators
Reexamination Certificate
2000-07-10
2002-04-16
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Feeding
Separators
C271S167000
Reexamination Certificate
active
06371477
ABSTRACT:
INTRODUCTION
This invention relates to a printer, scanner, copier, facsimile machine, etc., particularly the paper feeding mechanism of the printer, etc. to automatically place the paper in position for printing. Traditional paper feeding mechanism for a printer is shown in FIG.
1
A.
FIG. 1B
shows the cross-sectional view of the feeding mechanism along the section line AA ′in FIG.
1
A. The end of the paper tray
10
hangs out nearly horizontally as shown in
FIG. 1B
The front end of the paper tray
10
has a springboard
10
A which presses against a conveying roller
14
by the spring
12
. The conveying roller is driven by a rotating shaft
14
A. The front of the of the paper tray has a recess
10
D which allows the springboard
10
A to jitter. The springboard
10
A can tilt from an axis
10
C from position
10
A to position
10
B when more paper P is stacked against the springboard
10
A. The paper is positioned to provide contact CP between the paper P and the conveying roller
14
. The friction between the roller
14
and the paper P causes the paper to be fed though the guide G to a next position. A friction plate
16
is pushed by a second spring
18
to make contact with the conveying roller.
FIG. 1C
shows the front end of the paper tray causing the springboard
10
A to tilt to a position
10
B when more paper lays over the spring board.
Conventional practice dictates that the paper be manually fed, so that the paper is properly positioned and not be misfed.
Another problem with conventional paper feeder is that more than one sheet of paper may be unintentionally fed at the same time due to pressure of the remaining stack of paper in the tray pushing the sheet of paper being fed. Such misfeeding may cause the successive sheets to stagger and the printout to be distorted.
SUMMARY
An object of this invention is to automatically feed paper to a printer. Another object is to avoid misfeeding of paper in a printer. Still another object of this invention is to avoid human error in feeding paper to a printer. A further object of the present invention is to prevent more than one sheet of paper being fed at the same time.
These objects are achieved in this invention by using a resilient friction pad to push against a conveying roller. The resilient friction pad is housed in a recess at the front end of a paper tray. Each sheet of paper from the paper tray is conveyed one by one between the resilient friction pad and the conveying roller automatically.
To prevent more than one sheet of paper being fed at the same time, two springs are used to reduce the pressure of the sheets remaining in the tray
REFERENCES:
patent: 4865306 (1989-09-01), Himegi
patent: 5026042 (1991-06-01), Miller
patent: 5253854 (1993-10-01), Tanoue et al.
patent: 5573338 (1996-11-01), Morikawa
patent: 5718425 (1998-02-01), Veigl
patent: 6102389 (2000-08-01), Sakurai et al.
patent: 6135443 (2000-10-01), Yano
patent: 0 409 153 (1991-01-01), None
Avision Inc.
Bower Kenneth W.
Ellis Christopher P.
H. C. Lin Patent Agent
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